slate

[lavish carbon]

you should look at the Output log. the Error window is practically useless for unreal engine developement.

make sure there is no implicit cast for outputPin or folderPath. I would try this

FString folderPath = ...; // store them on explicit variables 
EDialogResult outputPin = ...;
// more code
.OnClicked_Raw(this, &FC2MModule::OpenDirectoryDialog, outputPin, folderPath)

implicit casts don't work here.

[frosty prawn]

EDialogResult isSuccesful = EDialogResult::Cancelled;
FString folderPath = TEXT("");```

Is TEXT(""); not correct for FString?

[lavish carbon]

that does not matter for code compliation.

[frosty prawn]

ok so there's no implicit cast

I also tried running that function without slate and it worked

so I don't think it's the parameters' type

error C2664: 'SButton::FArguments::WidgetArgsType &SButton::FArguments::OnClicked_Raw<FC2MModule,EDialogResult,FString>(UserClass *,FReply (__cdecl FC2MModule::* )(Var1Type,Var2Type),Var1Type,Var2Type)': cannot convert argument 2 from 'FReply (__cdecl FC2MModule::* )(EDialogResult &,FString &,const FString &,const FString &)' to 'FReply (__cdecl FC2MModule::* )(Var1Type,Var2Type)'

wait, does it want me to give 4 arguments even though 2 of them ahve defaults?

lemme check that

C2M.cpp(92): [C2664] 'SButton::FArguments::WidgetArgsType &SButton::FArguments::OnClicked_Raw<FC2MModule,EDialogResult,FString,FString,FString>(UserClass *,FReply (__cdecl FC2MModule::* )(Var1Type,Var2Type,Var3Type,Var4Type),Var1Type,Var2Type,Var3Type,Var4Type)': cannot convert argument 2 from 'FReply (__cdecl FC2MModule::* )(EDialogResult &,FString &,const FString &,const FString &)' to 'FReply (__cdecl FC2MModule::* )(Var1Type,Var2Type,Var3Type,Var4Type)'

nah that wasnt it

[lavish carbon]

try const function.

FReply OpenDirectoryDialog(
    EDialogResult& OutputPin, 
    FString& FolderPath,
 //...
) const;

notice the const at end. you must put this const in both header and cpp.

[frosty prawn]

same error

it keeps saying

cannot convert argument 2 from 'FReply (__cdecl FC2MModule::* )(EDialogResult &,FString &,const FString &,const FString &)' to 'FReply (__cdecl FC2MModule::* )(Var1Type,Var2Type)'

[lavish carbon]

where does const FString & come from?!

[frosty prawn]

FReply OpenDirectoryDialog(
    EDialogResult& OutputPin, 
    FString& FolderPath,
    const FString& DialogTitle = TEXT("Open Directory Dialog"),
    const FString& DefaultPath = TEXT("C:/")
);```

[lavish carbon]

Ah, I see. that's wrong

why did i not see that in the first place

[frosty prawn]

I tried completely removing both and staying with just outputPin & folderPath

still the same error

cannot convert argument 2 from 'FReply (__cdecl FC2MModule::* )(EDialogResult &,FString &)' to 'FReply (__cdecl FC2MModule::* )(Var1Type,Var2Type)'

[lavish carbon]

FReply OpenDirectoryDialog(EDialogResult& OutputPin, FString& FolderPath) const;

[frosty prawn]

oh I had const there, I just removed it now for testing

same error with it

FReply OpenDirectoryDialog(
            EDialogResult& OutputPin, 
            FString& FolderPath
        ) const;```
```cpp
FReply FC2MModule::OpenDirectoryDialog(
    EDialogResult& OutputPin,
    FString& FolderPath
) const
{
    //ウィンドウハンドルを取得
    void* windowHandle = FC2MModule::GetWindowHandle();

    if (windowHandle)
    {
        IDesktopPlatform* desktopPlatform = FDesktopPlatformModule::Get();
        if (desktopPlatform)
        {
            //ダイアログを開く
            bool result = desktopPlatform->OpenDirectoryDialog(
                windowHandle,
                TEXT("Open Directory Dialog"),
                TEXT("C:/"),
                FolderPath
            );

            if (result)
            {
                //相対パスを絶対パスに変換
                FolderPath = FPaths::ConvertRelativePathToFull(FolderPath);
                UE_LOG(LogTemp, Log, TEXT("Acquired folder path : %s"), *FolderPath);

                UE_LOG(LogTemp, Log, TEXT("Open Directory Dialog : Successful"));
                OutputPin = EDialogResult::Successful;
                return FReply::Handled();
            }
        }
    }

    UE_LOG(LogTemp, Log, TEXT("Open Directory Dialog : Cancelled"));
    OutputPin = EDialogResult::Cancelled;
    return FReply::Unhandled();
}```

[lavish carbon]

forward declare EDialogResult.

in your header

can you show me the EDialogResult enum?

[frosty prawn]

same error, unless I did not do it right

h - enum class EDialogResult : uint8;
cpp

enum class EDialogResult : uint8
{
    Successful, Cancelled
};```

[lavish carbon]

try including header for this enum in your module header

it seems enums can't be forward declared.

[frosty prawn]

I have this in my module header, or is it not what u mean enum class EDialogResult : uint8;

[lavish carbon]

yeah, that's what I had in mind, but it didn't work so I would try including the header instead.

something like #include "DialogResult.h"; in your module header

[frosty prawn]

its part of my plugin module header, which already is included

[lavish carbon]

enum should come before OpenDirectoryDialog

[frosty prawn]

it does

[lavish carbon]

Ok, try removing the &. so don't pass variables by reference. I know that breaks your logic but just to see if it compiles

FReply OpenDirectoryDialog(EDialogResult OutputPin, FString FolderPath);

[frosty prawn]

I just tried removing the EDialogResult argument so we're left with just folderPath, just to see if the issue is EDialogResult and it still doesn't work

cannot convert argument 2 from 'FReply (__cdecl FC2MModule::* )(FString &)' to 'FReply (__cdecl FC2MModule::* )(Var1Type)'

[lavish carbon]

ok, remove the &.

[frosty prawn]

oh ok, sec

omg I think it worked

[lavish carbon]

you can remove the const too I think.

[frosty prawn]

yeah I did that

It worked!!!

[lavish carbon]

apparently you can not pass variables by reference on to slate events.

[frosty prawn]

thank you so much ❤️

[lavish carbon]

A work around would be to declare your variables on the class.

[proven pilot]

If I want a Details panel which implements a property for assets, for example mesh or a camera. Do I have to look into engine code?

Didn't saw anything in the docs, besides SAssetProperty... Does it matter?

[deft yacht]

I've created a template Editor popup Window Plugin. I've created a function in this plugin that prints something on screen. I've added an EditableText to my popup window and I want it to call my Print function when OnTextCommited

It seems that the callable function must have certain input parameters like
void FTraceDebugWindowModule::DoSomething(const FText& InText, ETextCommit::Type InCommitType)

my editable text
+SVerticalBox::Slot().HAlign(HAlign_Left)
[
SNew(SEditableText)
.OnTextCommitted(this, &FTraceDebugWindowModule::DoSomething)
]

I get this error

changed to OnTextCommited_Raw and now it works

[harsh kraken]

Hey guys, what’s the best way to GetWorld in a slate class?

[mild oracle]

GEngine might work?

[harsh kraken]

I’m trying GEngine->GetWorld() but it doesn’t seem to work

[mild oracle]

Not sure then, I can look later

[harsh kraken]

Thanks

[spring frost]

If I call TakeWidget on a UUserWidget how do I get back to the UUserWidget from the resulting SWidget?

Ah I see, if TakeWidget is called on a UUserWidget its wrapped in a SObjectWidget which holds onto the UUserWidget.

🦆

Thanks.

[devout copper]

posted this earlier on cpp, with no reply, trying here now.
#cpp message

[devout copper]

Hi. If I have a UPROPERTY as an Array of a struct, and only one element of the struct is editable, and the others are transient, can I make it so the struct presents as the widget for the only editable type it contains?

Basically I just want to customize the property editor a little bit.

[mild oracle]

Ah shit I swear there is a way of doing this

It's one of those undocumented UPROPERTY meta props

[devout copper]

figures, it seems like it could just be the default if there's only one property.

but, that's what I'm hoping for. It'd be a lot simpler than having to customize an array property.

[mild oracle]

You could make a custom editor for it. It'd be a pain in the ass but a good learning experience heh

[devout copper]

Just found "meta TitleProperty", and a possible place with the answer, but I'm still waiting on my UDN access =\

https://udn.unrealengine.com/questions/279525/create-custom-view-in-ue-for-tarray-of-ustructs.html

[gritty frigate]

That link doesn't work since they re-did UDN earlier this year, and I can't find a question on the new UDN with the same subject

[ionic thunder]

Has anyone ever used the STextComboBox ? Although I can get it to populate from an options source, when I click to open the widget the editor crashes, with an EXCEPTION_ACCESS_VIOLATION. The strings added as content are stored to shared pointers.

[quaint zealot]

Where it does it crash

[ionic thunder]

the moment the box is clicked.

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000019

UE4Editor_Slate!SListView<TSharedPtr<FString,0> >::ScrollIntoView() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Public\Widgets\Views\SListView.h:1714]
UE4Editor_Slate!STableViewBase::Tick() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Views\STableViewBase.cpp:254]
UE4Editor_SlateCore!SWidget::Paint() [D:\Build\++UE4\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1285]
UE4Editor_Slate!SBox::OnPaint() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Layout\SBox.cpp:293]
UE4Editor_SlateCore!SWidget::Paint() [D:\Build\++UE4\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1390]
UE4Editor_SlateCore!SCompoundWidget::OnPaint() [D:\Build\++UE4\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SCompoundWidget.cpp:35]
UE4Editor_Slate!SBorder::OnPaint() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Layout\SBorder.cpp:120]
UE4Editor_SlateCore!SWidget::Paint() [D:\Build\++UE4\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1390]
UE4Editor_SlateCore!FSlateWindowElementList::FDeferredPaint::ExecutePaint() [D:\Build\++UE4\Sync\Engine\Source\Runtime\SlateCore\Private\Rendering\DrawElements.cpp:735]
UE4Editor_SlateCore!FSlateWindowElementList::PaintDeferred() [D:\Build\++UE4\Sync\Engine\Source\Runtime\SlateCore\Private\Rendering\DrawElements.cpp:760]
UE4Editor_SlateCore!SWindow::PaintWindow() [D:\Build\++UE4\Sync\Engine\Source\Runtime\SlateCore\Private\Widgets\SWindow.cpp:2107]

here a part of the call stack

I am adding the options to the cbox like this

  TArray<TSharedPtr<FString>> Options;
  Options.Add(MakeShareable(new FString("Option1")));
  Options.Add(MakeShareable(new FString("Option2")));

  SAssignNew(CBox, STextComboBox)
  .OptionsSource(&Options)

[quaint zealot]

I guess Options is just a local variable and so is destroyed along with its content as soon as the method exits

[ionic thunder]

oh I see, so I need to cache it

[split laurel]

It seems like STextComboBox wants a pointer to the string options and doesn't copy the data over (would need to look inside the source of STextComboBox to make sure), so yes, you need to hold onto the data

[craggy holly]

Anybody know how to create a Struct customisation, that also retains the customisations of internal properties?

I'm customising a struct and adding an FText property, but it's losing all of the FTextCustomisation

And unfortunately the internal types it uses to do the customisation aren't exposed

You'd think CreatePropertyValueWidget(true) would handle this :/

[split laurel]

This surprises me. Can you add a flinearcolor to see if that also loses customization? I believe I did something like this before but it simply worked

[craggy holly]

Yeah sure

FLinearColour shows nothing at all

It's just blank

Feels like a bug or a massive oversight really.

[harsh kraken]

Hey guys, I am trying to call a function from my game instance when I click a button. Calling GEngine->GetWorld()->GetGameInstance() always returns null since slate doesn’t have a world. Any ideas how I should go about this?

[quaint zealot]

Pass an UObject to your UI and store it as a TWeakPtr

[harsh kraken]

Do you know of a good website or video that has an example of doing this?

[quaint zealot]

No I don't

Slate isn't meant for game development anyway

Look at the editor source for Slate examples

[mortal echo]

Does DetailsCustomization just not work for instanced objects?

[mild oracle]

Hmmm Im pretty sure I've done that in the past?
I think the StyleSheet properties stuff here is Instanced
https://github.com/BraceYourselfGames/UE4-BYGRichText

[frosty prawn]

return SNew(SDockTab)
    .TabRole(ETabRole::PanelTab)
    [
        // Put your tab content here!
        SNew(SBox)
        .HAlign(HAlign_Center)
        .VAlign(VAlign_Center)
        [
            SNew(SButton)
            .HAlign(HAlign_Center)
            .VAlign(VAlign_Center)
            .ButtonColorAndOpacity(FLinearColor::White)
            .ContentPadding(FMargin(12, 4))
            .OnClicked_Raw(this, &FC2MModule::OpenDirectoryDialog, importDirName, FString ("Open C2M Directory"), FString ("C:\\"))
        ]
        SNew(SBox)
        .HAlign(HAlign_Center)
        .VAlign(VAlign_Center)
    ];```

why is my sbox not working

[mild oracle]

Which SBox and what do you mean not working?

[mortal echo]

Thanks for that. It doesn't look like it's using the Instanced markup, but doing it manually.
I also found that while it works for an instance (I tested with a light component) placed in a map, it didn't seem to work for an Instanced one is a random data asset. I wonder if it working there is a similar thing where it would work within the UMG details panel but not in a data asset details. I'll have to keep messing with it.

[frosty prawn]

the second one

[mild oracle]

The second one doesn't have any content from what I can see so it would make sense that it's not showing anything

[frosty prawn]

it wont even compile

[frosty prawn]

as u see in image it gives error

[mild oracle]

There's no image with an error as far as I can tell. It's hard to help debug.
I think your second SBox needs content in [ ] like your first one.

[split laurel]

Yep, needs content. For debugging purposes adding SNullWidget::NullWidget works fine

[gritty frigate]

Also there are two SBoxes in the content of the SDockTab. You can’t add multiple children like that - you need to use a widget with slots for multiple children (SOverlay if you want them on top of each other)

TBH, I’m also going to disagree with @mild oracle and @split laurel here - I’m pretty sure that leaving out the content is fine - it should at least compile. Your issue is the two SBoxes not the missing content in the second

[gritty frigate]

I just did a quick test - there is no compile error for having an SBox without content

[split laurel]

Huh, didn't look too closely. You are absolutely right. Unless it's a container, you get exactly one slot

[gritty frigate]

In the example you gave, @frosty prawn, if you wanted one over the other using an SOverlay, you'd want to do:

SNew(SDockTab)
.TabRole(ETabRole::PanelTab)
[
  SNew(SOverlay)
  +SOverlay::Slot()
  [
    SNew(SBox)
    // All the rest of the gubbins from the first SBox
  ]
  +SOverlay::Slot()
  [
    SNew(SBox)
    // All the rest of the gubbins from the second SBox
  ]
]```

Also, if you look in DeclarativeSyntaxSupport.h, line 407 (on 4.26), where TAlwaysValidWidget is defined, you'll see that it defaults to SNullWidget, so leaving the content empty is the same as adding an SNullWidget

[frosty prawn]

@gritty frigate Thank you!!

[gritty frigate]

You're welcome. One thing to remember with Slate is that there are 3 types of widget:

• No children
• Single child (add [] directly to the widget, like SDockTab in your example)
• Container (add slots with +SWidgetType::Slot() and then add [] to each slot, like SOverlay)

[frosty prawn]

works flawlessly, thanks alot guys ❤️

what is the alternative to SDockTab to get a window like this that has no tabs and the size of the window cannot be adjusted?

unfortunately it doesn't work well with widget reflector (info about it disappears as soon as window closes)

[craggy holly]

That is an SWindow IIRC

IIRC that widget is in FbxImportUIDetails

FbxMainImport.cpp line 256 in UE 4.25

That's where it creates the Modal Window

Then FSlateApplication::Get().AddModalWindow()

[frosty prawn]

found in 4.27, thanks! 🙂

[gritty frigate]

In any widget that overrides OnPaint, my understanding was that you had to increment LayerId for every draw call you make.
I was looking at SImage::OnPaint(), and I noticed that they don't do this in there - they pass LayerId through to FSlateDrawElement::MakeBox(), and then return the same one that they were given.
Is this an oversight in SImage, or have I misunderstood something?

[ionic thunder]

I am trying to set the style of an STextComboBox. However the downArrow image does not seem to set up correctly, I would say is not set at all. Any ideas on solving this ?

here the code for the style:

CustomStyleSet->Set("CBoxBranches", FComboButtonStyle()
    .SetDownArrowImage(BOX_BRUSH(TEXT("branch_64-64"), Icon24x24)));

code for the actual ComboBox

SAssignNew(BranchesCBox, STextComboBox)
.ComboBoxStyle(CustomStyle::Get(), "CBoxBranches")
.OptionsSource(&BranchesCBoxContent)
.OnSelectionChanged(this, &SpecPanel::OnBranchesDropdownChanged)

[frosty prawn]

hey guys, I have this basic window that lets a user select folder, and I'm trying to get the selected folder to the editable textbox. how do I make it update with the selected folder?

return SNew(SWindow)
    .SizingRule(ESizingRule::Autosized)
    .AutoCenter(EAutoCenter::None)
    .ClientSize(C2MImportWindowSize)
    .ScreenPosition(WindowPosition)
    [
        SNew(SVerticalBox)
        + SVerticalBox::Slot()
        .AutoHeight()
        .Padding(3.0f, 1.0f)
        [
        // Put your tab content here!
            SNew(SBox)
            .HAlign(HAlign_Center)
            .VAlign(VAlign_Center)
            .WidthOverride(400)
            .HeightOverride(40)
            [
                SNew(SButton)
                .HAlign(HAlign_Center)
                .VAlign(VAlign_Center)
                .ButtonColorAndOpacity(FLinearColor::White)
                .ContentPadding(FMargin(12, 4))
                .Text(FText::FromString("Load Directory"))
                .OnClicked_Raw(this, &FC2MImportUI::OpenDirectoryDialog, folderPath, FString ("Open C2M Directory"), FString ("C:\\"))
            ]
        ]
        + SVerticalBox::Slot()
        .VAlign(VAlign_Center)
        .HAlign(HAlign_Left)
        .AutoHeight()
        [
            SNew(SBox)
            .WidthOverride(200)
            [
                SNew(SHorizontalBox)
                +SHorizontalBox::Slot()
                .AutoWidth()
                [
                    SNew(SBox)
                    .WidthOverride(300)
                    [
                    SAssignNew(importPathBox, SEditableTextBox)
                    .BackgroundColor(FSlateColor(FLinearColor(FColor::White)))
                    .Text(FText::FromString(folderPath))
                    ]
                ]
            ]
        ]
    ];```

FString folderPath = "<default path>";

[split laurel]

Either you create a delegate for the text field so it executes a function each frame to determine the path text, or, if it exists, you need to register to a delegate of the directory window that is executed whenever folder selection changes, and then manually update the text via importPathBox->SetText or the likes

If it's a modal/blocking window you might also be able to retrieve the new path from results and then just update it manually

[sharp zinc]

Hi, can anybody point me to a way to add a localizable FText on a details customization panel?
The simple handle exposure with IPropertyHandle seems not to expose the localizable window with the down arrow that can be seen with the default UPROPERTY(EditAnywhere) specifier.

I can see that the source code mentions TSharedRef<IEditableTextProperty> EditableTextProperty = MakeShareable(new FEditableTextPropertyHandle(Handle, CachedDetailBuilder->GetPropertyUtilities())); but FEditableTextPropertyHandle is in an anonymous namespace so it is not accessible from outside its own file which leads me to think there is another way to do this.

[mild oracle]

I would also love to know this!

[prisma lark]

Hello guys!! Maybe someone knows how can i handle Ctrl+C Ctrl+V in my slate widget??

[prisma lark]

Hi, please specify what this text will be used for ??

And why you can't use LOCTEXT macro

[frosty prawn]

Excuse my ignorance, Im a beginner, but do you mean a get function to the importPath string?

even then how do I make it execute the get function every time the import dialog selects a file? I need to update the textbox to have the path in it

[split laurel]

essentially yes.
Slate attributes (attributes as opposed to arguments) can either contain direct values or delegates. In your example you are setting the text directly by simply giving it a text value.
You can however also instead use the following as an argument

.Text(this, &MyClass::FunctionWithReturnFText)

[frosty prawn]

will it update everytime I select a new path?

[split laurel]

this will call the function every frame to determine the file path as text

you'd need to get the file path yourself

the alternative is to check what the directory window is giving you yourself

[frosty prawn]

I have a button that opens a file dialog and sends the selected path back to FString var

and Im creating a get func that returns that var as FText

[split laurel]

yep that should work

[frosty prawn]

I will test that soon, thanks a lot mate!

[split laurel]

sure! Slate is not well covered online and there is a lot of trial & error involved in first learning it

[frosty prawn]

@split laurel Hey mate, I tried what you said now and I'm not sure why it won't compile.
cpp-

return SNew(SWindow)
    .SizingRule(ESizingRule::Autosized)
    .AutoCenter(EAutoCenter::None)
    .ClientSize(C2MImportWindowSize)
    .ScreenPosition(WindowPosition)
    [
        SNew(SVerticalBox)
        + SVerticalBox::Slot()
        .AutoHeight()
        .Padding(3.0f, 1.0f)
        [
        // Put your tab content here!
            SNew(SBox)
            .HAlign(HAlign_Center)
            .VAlign(VAlign_Center)
            .WidthOverride(400)
            .HeightOverride(40)
            [
                SNew(SButton)
                .HAlign(HAlign_Center)
                .VAlign(VAlign_Center)
                .ButtonColorAndOpacity(FLinearColor::White)
                .ContentPadding(FMargin(12, 4))
                .Text(FText::FromString("Load Directory"))
                .OnClicked_Raw(this, &FC2MImportUI::OpenDirectoryDialog, folderPath, FString ("Open C2M Directory"), FString ("C:\\"))
            ]
        ]
        + SVerticalBox::Slot()
        .VAlign(VAlign_Center)
        .HAlign(HAlign_Left)
        .AutoHeight()
        [
            SNew(SBox)
            .WidthOverride(200)
            [
                SNew(SHorizontalBox)
                +SHorizontalBox::Slot()
                .AutoWidth()
                [
                    SNew(SEditableTextBox)
                    .BackgroundColor(FSlateColor(FLinearColor(FColor::White)))
                    .Text(this, &FC2MImportUI::GetMyText)
                ]
            ]
        ]
    ];
}

FText FC2MImportUI::GetMyText() const
{
    return FText::FromString(folderPath);
}```
header
```hpp
FString folderPath = "<default path>";
FText GetMyText() const;```

I'll show u the error in 1 moment

[split laurel]

Chances are your FCM2ImportUI class doesn't inherit from TSharedFromThis<FCM2ImportUI> is that right?

[frosty prawn]

this is my class -

class FC2MImportUI : public IModuleInterface
{
public:
    static void* GetWindowHandle();
    enum class EDialogResult : uint8
    {
        Successful, Cancelled
    };
    FReply OpenDirectoryDialog(
        FString FolderPath,
        FString DialogTitle = TEXT("Window Title"),
        FString DefaultPath = TEXT("C:/")
        );
    TSharedRef<class SDockTab> OnSpawnPluginTab(const class FSpawnTabArgs& SpawnTabArgs);
    FText GetMyText() const;
    TSharedRef<class SWindow> CreateC2MImportWindow();
    FString folderPath = "<default path>";
private:
};

[split laurel]

yep, can't by default create shared ptrs from that class

[frosty prawn]

I'm not so sure what that means

[low bluff]

It means your class is not setup to be used as a shared pointer. You can probably find online how to do that. Or look at source code of classes that support it.

[split laurel]

you can either additionally inherit from TSharedFromThis<FCM2ImportUI> (although I'm not sure if that's a good idea with a module), or you can just create one by using other means. CreateRaw would work for example

wait a sec

[frosty prawn]

I know how to make it use inherit fromTSharedFromThis<FCM2ImportUI>, but what if I need to inherit from IModuleInterface?

[split laurel]

you can inherit from both

as an example, the reason why this works by default from inside widgets is because SWidget is defined as shown here. No need to set that inheritance up

[frosty prawn]

oh ok I see now

so in my case it would be class FC2MImportUI : public IModuleInterface, public TSharedFromThis<FC2MImportUI>

[split laurel]

alternatively

TAttribute<FText> TextAttribute = TAttribute<FText>::CreateRaw<>(this, &SNiagaraSystemEffectTypeBar::GetText);
PropertyWidget = SNew(STextBlock).Text(TextAttribute);

works as well

same pattern applies for you, just renamed classes and functions

yep, but I wouldn't do that, because sharedptrs are meant to manage lifetime of an object and doing this with module could have unwanted sideeffects

CreateRaw is quite safe here because the lifetime of your module is pretty much not an issue whatsoever

[frosty prawn]

doesn't seem like there's TAttribute<FText>::CreateRaw<>

[split laurel]

which version are you using?

[frosty prawn]

only TAttribute<FText>::Create, which teakes FName instead of FText

of unreal? 4.27

[split laurel]

yep. I was on ue5 right now. Let me check 4.27 source

but in any case, the process should be similar, but I don't know about that FName one

the Create function is overloaded, you should be able to do the same

[frosty prawn]

I changed my gettext function to return FName and tried using it with Create, but it gives me this

[split laurel]

yeah that's not going to help, the FName one is for calling UFunctions via reflection I believe. TAttribute<FText> directly means the function you bind to it returns an FText

have you tried doing my code sample above just with Create instead of CreateRaw<>?

[frosty prawn]

yeah it won't work because &FC2MImportUI::GetMyText is FText and Create expects FName

[split laurel]

I don't think that's quite right but okay, then do this

[frosty prawn]

TAttribute<FText> TextAttribute = TAttribute<FText>::Create<>(this, &FC2MImportUI::GetMyText);

[split laurel]

TAttribute<FText> TextAttribute;
TextAttribute.BindRaw(this, &FCM2ImportUI::GetMyText);

the static Create functions are just there to help with creation, binding on an existing attribute should be the same

[frosty prawn]

ok it builds and works, now I need to make the textbox update everytime the import dialog is used via the button

return SNew(SWindow)
    .SizingRule(ESizingRule::Autosized)
    .AutoCenter(EAutoCenter::None)
    .ClientSize(C2MImportWindowSize)
    .ScreenPosition(WindowPosition)
    [
        SNew(SVerticalBox)
        + SVerticalBox::Slot()
        .AutoHeight()
        .Padding(3.0f, 1.0f)
        [
        // Put your tab content here!
            SNew(SBox)
            .HAlign(HAlign_Center)
            .VAlign(VAlign_Center)
            .WidthOverride(400)
            .HeightOverride(40)
            [
                SNew(SButton)
                .HAlign(HAlign_Center)
                .VAlign(VAlign_Center)
                .ButtonColorAndOpacity(FLinearColor::White)
                .ContentPadding(FMargin(12, 4))
                .Text(FText::FromString("Load Directory"))
                .OnClicked_Raw(this, &FC2MImportUI::OpenDirectoryDialog, folderPath, FString ("Open C2M Directory"), FString ("C:\\"))
            ]
        ]
        + SVerticalBox::Slot()
        .VAlign(VAlign_Center)
        .HAlign(HAlign_Left)
        .AutoHeight()
        [
            SNew(SBox)
            .WidthOverride(200)
            [
                SNew(SHorizontalBox)
                +SHorizontalBox::Slot()
                .AutoWidth()
                [
                    SNew(SBox)
                    .WidthOverride(300)
                    [
                    SAssignNew(importPathBox, SEditableTextBox)
                    .BackgroundColor(FSlateColor(FLinearColor(FColor::White)))
                    .Text(TextAttribute)
                    ]
                ]
            ]
        ]
    ];```

here's how it currently looks like

[split laurel]

looking good. Is your text attribute simply returning folderPath?

If so you only need to update folderPath when the user has selected a directory. So something like:

void FCM2ImportUI::OnDirectoryChosen(FString Path)
{
  folderPath = Path;
};

that's it. The text will automatically update then

[frosty prawn]

you see OpenDirectoryDialog function inside the button

that one takes folderPath and updates it

[split laurel]

does it actually update the original folderPath variable though? Because if so the text should automatically update as well

can you show me the OpenDirectoryDialog function?

[frosty prawn]

Reply FC2MImportUI::OpenDirectoryDialog(
    FString FolderPath,
    FString DialogTitle,
    FString DefaultPath
)
{
    void* windowHandle = GetWindowHandle();
    EDialogResult OutputPin = EDialogResult::Cancelled;
    if (windowHandle)
    {
        IDesktopPlatform* desktopPlatform = FDesktopPlatformModule::Get();
        if (desktopPlatform)
        {
            bool result = desktopPlatform->OpenDirectoryDialog(
                windowHandle,
                DialogTitle,
                DefaultPath,
                FolderPath
            );

            if (result)
            {
                FolderPath = FPaths::ConvertRelativePathToFull(FolderPath);
                UE_LOG(LogTemp, Log, TEXT("Acquired folder path : %s"), *FolderPath);
                UE_LOG(LogTemp, Log, TEXT("Open Directory Dialog : Successful"));
                OutputPin = EDialogResult::Successful;
                return FReply::Handled();
            }
        }
    }

    UE_LOG(LogTemp, Log, TEXT("Open Directory Dialog : Cancelled"));
    OutputPin = EDialogResult::Cancelled;
    return FReply::Unhandled();
}```

as u can see in my .OnClicked_Raw, folderPath is the first variable (FolderPath inside the dialog function)

and its the same variable that GetMyText returns as FText

[split laurel]

ah yes, you are not properly updating the original though. Your parameter is given by value, not by reference, so the update inside the if (result) will be lost

change the signature to

Reply FC2MImportUI::OpenDirectoryDialog(
    FString& FolderPath,
    FString DialogTitle,
    FString DefaultPath

and it should work

you could also just write to folderPath directly

[frosty prawn]

I didnt do that so I can use that function for other dialogs/values

[split laurel]

makes sense, then the reference version is the one you should use

[frosty prawn]

as soon as I changed FString FolderPath to FString& FolderPath, it won't take accept folderPath anymore

[split laurel]

what's the error? Also use the output tab instead of the error list

[frosty prawn]

Error C2664 : 'SButton::FArguments::WidgetArgsType &SButton::FArguments::OnClicked_Raw<FC2MImportUI,FString,FString,FString>(UserClass *,FReply (__cdecl FC2MImportUI::* )(Var1Type,Var2Type,Var3Type),Var1Type,Var2Type,Var3Type)': cannot convert argument 2 from 'FReply (__cdecl FC2MImportUI::* )(FString &,FString,FString)' to 'FReply (__cdecl FC2MImportUI::* )(Var1Type,Var2Type,Var3Type)'```

[split laurel]

mhhh not entirely sure. Have you changed the signature in both header and cpp?

[frosty prawn]

folderPath is FString

yeah

FReply OpenDirectoryDialog(
    FString& FolderPath,
    FString DialogTitle = TEXT("Window Title"),
    FString DefaultPath = TEXT("C:/")
    );```

.OnClicked_Raw(this, &FC2MImportUI::OpenDirectoryDialog, folderPath, FString ("Open C2M Directory"), FString ("C:\\"))

[split laurel]

let me try something out real quick

I know a couple ways to go around this but I'd like to know why exactly this isn't working. Perhaps you can't use references with raw delegates because it can't be ensured that the reference will still be valid later

seems references just generally don't work with delegates using variadic arguments. Ok

in that case you can probably do it via pointer instead

so

FReply OpenDirectoryDialog(
    FString* FolderPath,
    FString DialogTitle = TEXT("Window Title"),
    FString DefaultPath = TEXT("C:/")
    );

and

.OnClicked_Raw(this, &FC2MImportUI::OpenDirectoryDialog, &folderPath, FString ("Open C2M Directory"), FString ("C:\\"))

[split laurel]

put a * in front of that

[frosty prawn]

oh f me

[split laurel]

desktopPlatform->OpenDirectoryDialogdoesn't want a a pointer but a value, so we dereference the pointer again

[frosty prawn]

it works !!!

thank you for your time mate, I really appreciate it!

[split laurel]

finally! :)

glad it worked out in the end

[frosty prawn]

❤️

[mild oracle]

We're having a really weird crash on SWidget::AssignIndices called from FSlateInvalidationRoot::BuildFastPathList... Has anyone seen this?
Really grasping at straws here

[upbeat pebble]

Is there some way to intercept all mouse down/touch events from bp or cpp? If so can somebody point me in the right direction?

Basically I want to know where I would put this code

[rain heron]

okay... idk why that is the case... but when i have a leaf widget, and that leaf widget creates draw elements... it looks like those wont get cleaned up causing a memory leak...
is there something i have missed?

[mild oracle]

Not sure but I would suggest looking at the engine code base to find any examples of leaf widgets. Check what kind of cleanup they do

[rain heron]

they kinda do none... at least i cant find anything

[mild oracle]

Hmm. Slate stuff is part of regular C++ afaik in that it's not garbage collected.
Maybe set a breakpoint in a slate class's destructor to see where it's called?

[frosty prawn]

Hello, I'm trying to make a function that sets and returns SHorizontalBox, so I can add it using SAssignNew(), but it doesn't seem to do anything..
here's the function

TSharedPtr<SHorizontalBox> SC2MOptionsWindow::AddNewLine(FText InKey, FText InValue)
{
    return SNew(SHorizontalBox)
                + SHorizontalBox::Slot()
                .AutoWidth()
                [
                    SNew(STextBlock)
                    .Font(FEditorStyle::GetFontStyle("CurveEd.LabelFont"))
                    .Text(InKey)
                ]
                +SHorizontalBox::Slot()
                .Padding(5, 0, 0, 0)
                .AutoWidth()
                .VAlign(VAlign_Center)
                [
                    SNew(STextBlock)
                    .Font(FEditorStyle::GetFontStyle("CurveEd.InfoFont"))
                    .Text(InValue)
                ];
}```

here's how I add it

TSharedPtr<SBox> ImportMapHeaderDisplay;
TSharedPtr<SHorizontalBox> TestBox = SC2MOptionsWindow::AddNewLine(FText::FromString("asd"),FText::FromString("qwe"));

ImportMapHeaderDisplay->SetContent(
    SNew(SBorder)
    .Padding(FMargin(3))
    .BorderImage(FEditorStyle::GetBrush("ToolPanel.GroupBorder"))
    [
        // Add map name to our info display
        SNew(SVerticalBox)
        + SVerticalBox::Slot()
        .AutoHeight()
        [
            SAssignNew(TestBox, SHorizontalBox)
        ]
    ]
);```

it works if I dont use the function and just add it the way I do inside the function, but I wanna avoid copy pasting the same few lines for each line I add

[quaint zealot]

SNew doesn't return anything

Try SAssignNew with a temporary shared ptr to return

And I mean, no, that should work but the SAssignNew(TestBox, SHorizontalBox) line is just wrong

You're literally erasing the function's result here

[split laurel]

^

to add to that, if you have a sharedptr to a valid widget already and just want to put into a slot it looks like this:

 // Add map name to our info display
        SNew(SVerticalBox)
        + SVerticalBox::Slot()
        .AutoHeight()
        [
            TestBox.ToSharedRef()
        ]

[frosty prawn]

TestBox.ToSharedRef() does the job, thanks!

[frosty prawn]

yeah I just looked at it again and it made no sense haha

[tired valley]

does anyone here have any recent examples of using SMeshWidget?

[warm vault]

Is it possible to use SNew and construct your widgets from a UUserWidget?

[trim kestrel]

Does anyone know how I can access the slot offset properties of a UImage from c++? I have a base class already, I just can't seem to find the property to change it

[gritty frigate]

Those are properties on the canvas panel slot, not the Image.

You’d need to call CanvasPanel->AddSlot() with the SImage as a child and store the returned slot

[trim kestrel]

Interesting, I’ll give that a try, thank you!

[wild pumice]

How do I implement a custom Graph Panel? I made my own SCustomGraphPanel and SCustomGraphEditor but I'm not able to use the graph panel. I'm using the custom graph editor which has a function called GetGraphPanel() which doesn't seem to be called anywhere (I put breakpoint and it never hit after opening the graph editor). It seems SGraphEditorImpl implements graph panel but it is created in a private function which I cannot override.

Most of the useful stuff seems to be locked behind private scope

[silk vault]

It might be worth checking out Generic Graph - https://github.com/jinyuliao/GenericGraph - It's pretty much as close to bare minimum implementation of a Custom Graph Editor derived from Behavior Tree Graphs. @wild pumice

[molten widget]

How can I just fill with color?

I just want to fill entire overlay slot with white color

SColorBlock

[fossil kayak]

use SBorder maybe?

[molten widget]

Also good. Thank you. Prolly SColorBlock works for me

[wild pumice]

Thank you. I've seen it but there is no custom graph panel implementation in there.

[tired harness]

I am trying to get an SScaleBox to not scale larger than the desired size of its content.
I am using .Stretch(EStretch::ScaleToFit)

SButton
[
    SNew(SScaleBox)
    .Stretch(EStretch::ScaleToFit)
    [
         .SNew(STextBlock)
    ]
]

In UMG the default behaviour of these appears different.
With this slate code what happens is that scale box takes up the entire size of the button its in

And the text scales with the scalebox. So a big button results in massive text

This is the default UMG behaviour

this is the slate behaviour

I tried a bunch of different stretch options but whatever the magic combination is that makes it work, I have not yet found it

[split laurel]

haven't looked into it but can you change alignment of the SScaleBox to be center? Think it defaults to fill so the scale box will attempt to fill its parent rather than just letting its children elements dictate its size

[tired harness]

yeah I tried setting the HAlign and VAlign to center previously.

I think I can delete my own question since I ended up just throwing up my hands and using UMG

[split laurel]

no point in deleting, it might be of use to anyone coming across :)

UMG just wraps around Slate though so there is a solution to this problem

[tired harness]

completely unrelated, but do you happen to be one of the wizards that understands editor slate?

[split laurel]

that's what slate is for so yes I guess so. I do work with it daily

[tired harness]

I dont think there is a seperate place for editor slate questions so I guess I might as well ask here.
Do you happen to know if it possible (and roughly how) to have an extra sub group in the details panel of an array of structs? I tried messing around with IDetailBuilder and some other but couldnt make it work at all. That stuff is just slate wrappers right?

[split laurel]

I'm curious though, how did you create the 2nd video showcasing the slate behavior? Did you expose that widget to UMG to create it?

[tired harness]

the second video is using a duplicate class of UButton

since a few members that I needed access to where protected I decided to just duplicate the UButton.h/cpp in its entirety and add the changes there

[split laurel]

I understand

basically you want to insert some widgets between array entries? That's definitely more advanced than the typical details customization needs.
You might be able to do this using an FDetailArrayBuilder subclass

the DetailBuilder accepts multiple ways of customizing property UI, one of them is via a custom builder.
An example can be found in FNiagaraDataInterfaceSkeletalMeshDetails.cpp where the array builder is instantiated and registered, and then the FNiagaraDetailSourcedArrayBuilder

[tired harness]

right so basically.

DetailView
-> Struct
    -> Array of Structs
        -> (0)
            -> Value one
            -> Value two
              -> Some sort of group indent so I can group values, like the way category drop downs work
            -> Some other values

Do you happen to know of the top of your head where that is used so I can look at the generated UI in the editor and see if that is what I am after?

I am kinda just theorizing that the names I use to describe what I want is the same thing in slate

[split laurel]

this isn't used like you would like it used, that's why I'm not 100% confident that it works for your case

[tired harness]

well, it seems like when a struct is part of an array all its categories dont show up

so that is what I am trying to solve essentialy

[split laurel]

but if you want to take a look, if you create any niagara system, and add a skeletal mesh user parameter, then go to user parameter defaults in the system node, you get a "filtered bones" array. Internally, it's just a TArray<FName>. The UI is customized per row though, and you might be able to insert custom widgets after a typical row

[tired harness]

I will take a look right now

I dont think that is what I am after, at least I can't tell visually

[split laurel]

that's what I figured, yes

[tired harness]

hmm let me boot up an empty project so I can use screenshots, which is a much better way to explain UI than text could ever be

[split laurel]

I realized you want to customize the struct UI inside the array; I thought you want to insert something between elements of the array. In that case customizing the struct itself might work. Using a property row generator for that struct, iterating over the property tree nodes and adding the category widgets back might also work

[tired harness]

well in any case, its clearly possible then

and i just need to figure out what I need to do

online resources are kinda scarce on the topic and for some reason never include any images. (UI code reference without screenshots of the result are kinda pointless)

[split laurel]

true, this stuff is essentially not covered at all. A couple blogs include some information, some good, some bad, but rare regardless

[tired harness]

Thats why I figured I would use this golden opportunity to just ask you while you happen to be here.
Still going to have to bang my head against a proverbial brick wall for the next 20 hours or so before I can make it work most likely but at least I know now that it CAN be made to work

[split laurel]

it should be possible but you might run into some troubles. While the property editor module (including the details panel) is fairly flexible there are always some hidden limitations that also aren't clear to me

[tired harness]

Huh, I cant find the message you posted anymore. I could swear you mentioned some arraybuilder

[split laurel]

this one?

[tired harness]

ah yes there it is. FDetailArrayBuilder

so is the DetailArrayBuilder used for the array itself, or the struct inside the array?

[split laurel]

that's used to customize the display of an array. But I posted this when I assumed you wanted to insert widgets between array elements

[tired harness]

ah right

yeah no thats fine.
The UPROPERTY array can just be displayed as
(0)
(1)
(2)
and I guess meta = (TitleProperty = "Some Name") can be used to modify what is displayed to the right of that easily

i just care about modifying how the
UStruct
and its UPROPERTY members are displayed once you expand the array

is it the IDetailCustomization perhaps?

[split laurel]

for struct customization you'd typically use a IPropertyTypeCustomization IIRC

good example here would be the FColorStructCustomization

[tired harness]

alright, well its getting pretty late. I will try it out some more tomorrow. Thanks a lot for the help though!
I wish I knew some editor customization wizard sitting somewhere that I could poke all day and who would be happy to share his arcane knowledge

[split laurel]

I feel the same way about some seniors on my team but alas we all have things to do hahah

and glad to help, I frequently check this channel but I don't necessarily post frequently

[tired harness]

I sometimes post here and then leave for a day or two. I think #cpp is where all the action is. Barely any slate people around

[split laurel]

by the way, while I haven't tested the slate version, I have tested your scalebox setup in UMG and when the scale box alignment is set to fill rather than center it does behave like your slate video, and from looking at source code the default alignment seems to be the only difference I could spot at a glance.
UScaleBoxSlot is initialized to use center-alignment whereas SScaleBox will initialize to use fill alignment, so maybe your test was off somehow?

[pseudo patrol]

hi!

I add a SImage to my slate ui and get the checkerbaord image. When I call SetImage() on it with a brush created like this slatebrush = new FSlateMaterialBrush(*mat, FVector2D(32, 32));, that material gets shown instead. but after 60 s it disappears. if I don't assign the brush, the checkerboard stays forever

how to I assign a material/brush in a way it does not get garbage collected?

[quaint zealot]

Short answer, using UMG

Longer answer, using any persistent UObject with UPROPERTY

[pseudo patrol]

hmm. what exactly gets garbage colelcted? The SImage? The brush?

[quaint zealot]

The material

Slate brushes and images are not UObjects and thus cannot be GC

[pseudo patrol]

oh the material of the brush

so I additionally put it as a uproperty in a UObject so it doesn't get collected?

[quaint zealot]

Or use UMG which is designed to handle materials

[dry ice]

Hey, I was hoping to get some advice. I'm trying to make a crosshair for my game, and I want to avoid using a rasterized texture/icon for it, and instead use vector graphics.

Initially I read a little bit about "SMeshWidget", but I read something saying that "FSlateDrawElement" is what I should be using for drawing a specific geometric shape.

[rocky abyss]

You could use SDFs as they are math generated shapes that can scale like vectors but not really bezier based. No need to quite program your own geometry. But I am curious if you do end up with drawing something in the SMeshWidget how it turns out

[quaint zealot]

Or just use materials directly

[dry ice]

I tried doing a quick google to see if I can find any examples of people using SDFs but I didn't find anything. Do you know of any resources I could look at to learn about them?

[dry ice]

I did try using materials to make shapes with math, but it was a bit painful to get any complicated shapes, and I was getting really bad aliasing on my edges

[quaint zealot]

You can do the shapes by queuing Slate primitives (quad spline etc)

The aliasing will be a problem with Slate meshes too since it's post-antialiasing

Only textures or pixel-perfect geometry can get clean unaliased results in UI

[dry ice]

Okay, so that means that realistically, if I want to get an unaliased UI then I need to use a texture, as I don't think I can make pixel-perfect geometry all the time.
How does the text renderer in umg get around this issue? because it seems to not be an issue for text. Does that mean SDFs also can't lead to unaliased results?

[quaint zealot]

First, note that by default in UMG and Slate everything is pixel snapped (so a 0.5px high line will be sometimes 0, sometimes 1px high) so it's always pixel perfect, though the rounding may be offputting in some cases, and can be disabled per object at least in Slate

Text rendering is a dedicated system, with its own AA

And text is specifically rasterized too, it doesn't show up as geometry

SDFs can and will produce unaliased results, since usually they're essentially textures, with mipmapping and filtering

[dry ice]

so then what options do I have?

[rocky abyss]

https://joyrok.com/SDFs-Part-Two

I wrote something a while ago but SDFs in theory don't have aliasing if you just adjust the smooth step

[quaint zealot]

For a crosshair, the simplest option is to use a texture ! If your crosshair cross is 2px wide, it will work perfectly with no effort at all

If you need it to be say, 1px wide, you can see that there can be no perfect solution

It'll boil down to filtered textures, or SDFs

If you have animated or parametric shapes, you can have multiple crosshair elements using textures

Or you can use a single SDF too

[dry ice]

thanks a lot for the help! I think I think I'm gonna go with using an SDF. And if that doesn't work then I'm just gonna use textures.

[zenith cedar]

Hi guys i am making inventory but i have no ideas about the inventory with different items size like this picture .

anyone have any ideas? Thanks

[fossil kayak]

I have some uproperties and I want to create a widgets to edit them manually, what is the best way to do this? is there some kind of a function that will return me a widget if I pass it a uproperty? that would be handy

[lavish carbon]

@fossil kayak IPropertyHandle has CreatePropertyValueWidget and CreatePropertyNameWidget. you have to create a detail customization.

https://docs.unrealengine.com/4.27/en-US/ProgrammingAndScripting/Slate/DetailsCustomization/

[fossil kayak]

oh thanks, do you know how could I get the IPropertyHandle out of FProperty?

[lavish carbon]

Unfortunately you can't. IPropertyHandle is only accessible from IDetailLayoutBuilder. These are editor only by the way.

[fossil kayak]

oh so yeah, I checked out the source code and it turns out those property widgets are strongly bound to the object that these properties come from, so unless I want to copy paste the entire property widget generation code from source code I will need to do it some other way, I think if I spawn some sort of a shadow object and use IDetailsView with customization to show only properties that im interested in that will do the trick

[split laurel]

There are a couple ways you can approach this. All of those ways work via the propertyeditormodule that exposes accessors for UI generation. Be it a details panel that you customize via arguments, general details customisation that will customize all details panels, property row generators to build widgets for individual properties.. the latter you can make work with just a UObject or UStruct.
The property row generator will let you access the detail tree node structure, and for each of these you can individually create widgets however it seems fit.

If you basically want a details panel that only shows specific properties, you can create a new details panel and give it a custom filter. That filter lets you check fproperties for inclusion or exclusion

You can then either hardcode the included properties via name, or just give the relevant properties a meta tag that you can check for

You can do completely custom widgets too, just need a way to instantiate the widgets (in a new window or tab for example) and a pointer or reference to the data that should get modified. The disadvantage here is that you aren't doing this via propertyhandles so you lose default functionality like the revert to default button, or undo redo support

[fossil kayak]

oh okay, I see it now, unfortunately none of these will work for me since what I wanted to achieve is to collect the properties with meta flag from the CDO, then create widgets for those properties, set some values in them and then copy those values when placing instances of the object

[fossil kayak]

but thanks anyway, I learned something, didn't know that IPropertyGenerator was a thing

[fossil kayak]

could you elaborate what filter do you have in mind?

[split laurel]

since you only wanted to show specific properties, put some markup on them via meta tag, and then check inside the filter for that tag. This way you only get those properties and since it's using the details panel you get all the default functionality @fossil kayak

[fossil kayak]

yeah, that is what I have already, I have details panel created and I also created IDetailCustomization for it but in only allows me to HideProperty and that would be tedious to do but you were talking about some sort of inclusion of properties it the details view, so is there any other way to do it?

[split laurel]

yes. If you don't use customizations, but instead create a new details panel via fpropertyeditormodule, the creation function takes arguments and you can register a custom filter with that details panel

[fossil kayak]

if not, imma just iterate over all of the properties and hide them

[split laurel]

if you do it via details customization, then yes, you can also just hide all of them by default and then only show the ones with the meta tag

[fossil kayak]

yeah, could you elaborate a bit? I only see this filter in detail view args

    /** Optional object filter to use for more complex handling of what a details panel is viewing. */
    TSharedPtr<FDetailsViewObjectFilter> ObjectFilter;

im not sure which filter you are talking about

[split laurel]

let me open up unreal

it's not in the args, it's a function you can call on the created details view object

SetIsPropertyVisibleDelegate

[fossil kayak]

omg, how could I miss it

yeah, there it is, I was checking this class a few times and found only the version for custom rows and somehow missed this one, thank you very much and sorry for bothering you

[split laurel]

don't stress it, if I didn't want to help I wouldn't

[fossil kayak]

do you know by any chance how to hide the Transform category? i hid everything else using this delegate and only the Actor and Transfrom categories were left, so I hid the Actor category using customization but it unfortunately doesn't work for transform

[split laurel]

hmmm I don't really know. What I do know is that customized categories can show up despite that custom filter correctly disregarding a property (I was confused for a whole while while debugging this). Turns out overriding a customization for that details panel for that property basically reset that customization so internally it was no longer considered "customized", and would be filtered out correctly.

I believe I've done this by calling something like

DetailsView->RegisterInstancedCustomizationType(StructName, DetailsView->GetGenericCustomization());

or something along those lines

it could also be that transform is such an important special case that you just can't get rid of it

[fossil kayak]

hmm, okay, thanks, i will try that

[fossil kayak]

okay, so I looked at the source code and found how the transform category is added

if (!HideCategories.Contains(TEXT("Transform")))
{
    AddTransformCategory(DetailLayout);
}

so I managed to hide it by doing this in my customization that is applied only to my particular details view

DetailBuilder.GetBaseClass()->SetMetaData(TEXT("HideCategories"), TEXT("Transform"));

[split laurel]

that's great! Does DetailBuilder.GetBaseClass() return the class of the object that is being modified? It irks me a little to set meta data on a class object because the CDO is being modified. On the other hand, if it's only a specific class or set of classes that you want to display in the details view, you could also probably just add the HideCategories meta data to the UCLASS itself, no?

but even if so, not a big deal. Good job on finding this 👍

[fossil kayak]

Does DetailBuilder.GetBaseClass() return the class of the object that is being modified
yeah it seems so
On the other hand, if it's only a specific class or set of classes that you want to display in the details view, you could also probably just add the HideCategories meta data to the UCLASS itself, no?

    TArray<TWeakObjectPtr<UObject>> Objects;
    DetailBuilder.GetObjectsBeingCustomized(Objects);
    for (TWeakObjectPtr<UObject>& It : Objects)
    {
        It->GetClass()->SetMetaData(TEXT("HideCategories"), TEXT("Transform"));
    }

yeah, if it is what you meant it works as well and is probably a better way to do it, didn't think of the CDO, thanks

[split laurel]

Sorry, I wasn't being clear. That right there would be the same thing as your previous solution because you are still modifying the class CDO.
What I meant is going into your actor class that you want to display, and quite literally writing down the hide categories transform flag into the UCLASS() macro so you will only set that meta data for the classes you want to display

On the other hand, can't you just call hidecategory in the detailsbuilder itself? This way you don't need to change meta data at all

[fossil kayak]

unfortunately no, that is the first thing I tried and it works for other things but not for transform, from what I see, this hides this category only in my details panel so that's good since I want to use those object in a normal way as well

[lavish carbon]

you can hide transform, it's just unusual category name. you need to hide TransformCommon category. @fossil kayak @split laurel

[split laurel]

Hah, interesting. Good to know. Thank you!

[fossil kayak]

oh, yeah it worked, thanks mate

[glad elm]

Hello, I heard I can achieve this type of thumbnail with a SMeshWidget. Currently I'm using a scene capture component and render target and an UImage. I read SMeshWidget is not something to easy to work with from #slate 's message history. That'll be my first time with Slate framework, can anyone recommend some resources about SMeshWidget and Slate?

[craggy holly]

SMeshWidget isn't for drawing actual meshes - it's for drawing a lot of the same thing.

The only way to achieve that is via scene capture and an image

[tribal venture]

Hi, I got a question about SlateStyle in CPP.
The style class always consists of static member methods, and functions. My understanding is that the style definitions only, so that's why the class consists of statics. Am I right?

[split laurel]

not sure if I understand your question correctly, but typical slate style classes don't specifically contain slate resources. That's what the FSlateStyleSet is for, and the typical static Initialize or Create function in a style class merely creates an FSlateSlateSet object, registers slate resources and then registers itself to the slate style registry

[novel ice]

Hi!
I sometimes have this error:
"The requested size for SRetainerWidget is 0" in the SRetainerWidget
Which leads to rendering an image on the screen which was inside of a RetainerBox. The image can be removed by changing viewport size.
Does anyone know how can I fix this?

[mild oracle]

Hard to tell what it could be without more info. Is the desired size really zero? What's inside the retainer box, can you post the tree?

[amber bison]

how would you go about hiding properties that are registered for a custom property layout but are "disabled"? It seems that the meta specifier for EditCondition still works because the properties are being disabled, but they're not hiding (EditConditionHides is being ignored)

[ocean mason]

I believe you have to add this as well HideEditConditionToggle

[novel ice]

Hi! There was an overusage of sizeboxes in the layou, I fixed the problem, but still have errors.
LogUMG: Error: The requested size for SRetainerWidget is too large. W:-1073741824 H:-1073741824 LogUMG: Error: The requested size for SRetainerWidget is 0. W:0 H:0
Currently it is:
Canvas->ScaleBox->Overlay->Canvas->ScaleBox->Overlay->RetainerBox->NamedSlot->Image

[mild oracle]

Maybe the problem is happening before the named slot contents are initialized?

[novel ice]

🤔 How can I ensure Slot Content to be initialized beforehand?

[jolly prawn]

does a checkbox slider slate widget exists?

[mild oracle]

SCheckbox maybe
Slider or not is just a visual thing. That's on you to skin

[mild oracle]

I don't know sorry

[novel ice]

Anyway, thank you for your suggestions! I'll try to debug this particular case

[restive sapphire]

Hello 🙂

How do you go about displaying the elements of an array within a struct? I currently have the following in the CustomizeHeader and CustomizeChildren for my property customization. The array shows up and you can add elements to it, but none of the elements are displayed.

// Customize Header
void FMyCustomStructCustomization::CustomizeHeader(TSharedRef<IPropertyHandle> StructPropertyHandle, FDetailWidgetRow& HeaderRow, IPropertyTypeCustomizationUtils& StructCustomizationUtils) {
 
  HeaderRow
  .NameContent()  [ StructPropertyHandle->CreatePropertyNameWidget() ]
  .ValueContent() [ StructPropertyHandle->CreatePropertyValueWidget() ];

}

// Customize Children
void FMyCustomStructCustomization::CustomizeChildren(TSharedRef<IPropertyHandle> StructPropertyHandle, IDetailChildrenBuilder& StructBuilder, IPropertyTypeCustomizationUtils& StructCustomizationUtils) {

  MyArrayPropertyHandle = StructPropertyHandle->GetChildHandle(GET_MEMBER_NAME_CHECKED(FMyCustomStruct, MyArray), false);

  StructBuilder.AddCustomRow(LOCTEXT("My Array", "My Array"))
  .NameContent()  [ MyArrayPropertyHandle->CreatePropertyNameWidget()  ]
  .ValueContent() [ MyArrayPropertyHandle->CreatePropertyValueWidget() ]; // doesn't show any array items

}

[grim glen]

Would anyone be able to help me troubleshoot why my widget blueprint passed to the MoviePlayer's FLoadingScreenAttributes.WidgetLoadingScreen renders slightly different than when I just add the widget blueprint straight to the viewport?

I even tried wrapping my widget in a slate object identical to the one the MoviePlayer uses and it still isn't right (the text and throbber are smaller in size when using the MoviePlayer, but the background image looks consistent)

[grim glen]

So if I set the DPI scaling on the widget that I manually create to .75, it will match perfectly the MoviePlayer's rendering of my widget. But as soon as I change my windows scaling, my magic .75 DPI scaling stops working (as expected). I just need to figure out how to calculate that correct DPI scaling. The .75 scaling works when my Windows display scaling is set to 150% at a resolution of 2560x1440.

[inland flower]

How can I do an opacity gradient in Slate when using FSlateDrawElement, or on the final composited geometry at the end of OnPaint?

[sharp zinc]

Hello. How would I go about making a "copy" of a RichTextBlock but "remove" it's ability to change it's text size based on resolution. I want text to always be the same size I set it at. Then I want to just but the textblock in a scale box and have it scale proportionally.

[mild oracle]

It's not just rich text blocks that scale with resolution, that's a DPI scaling thing isn't it?

[sharp zinc]

@mild oracle , I assume it is, but I want to scale my text absolutely manually because it causes overflows and it beaks my layout.

When I say manually I really mean scale it as if it were an image. No need for fancy row rearrangements as a result of desired size or whatever that is

[mild oracle]

Ohhh I've seen that behaviour too. I thought it was because it was using a different font size for each resolution, and fonts at different sizes can have different proportions. That plus all the complicated text layout logic for keeping characters looking clear and crisp can mean that the text takes up more or less horizontal space.

To change this behaviour you might have to dig pretty deep into Unreal's text layout code...

[mild oracle]

I wonder if there's a way you could do something like this with Retainer Box, manual invalidation or something :S

[sharp zinc]

I can show you some video footage to be sure.

@mild oracle , sent a private message with video footage

[frail rover]

wondering if anyone would know something about line tracing in a custom editor viewport preview scene.
as i cannot seem to be able to hit anything and made sure the plane mesh is block on all collision channel responses.

[quaint zealot]

Anyone familiar with the new changes in UE5-main re: slots ? FSlot vs FSlot::FSlotArguments specifically, seems to break DLSS and also my own code

More specifically, how do I get actual args values from say, InArgs._Slots - assuming I have SLATE_SLOT_ARGUMENT(FSlot, Slots) ?

[quaint zealot]

Alright, fixed it

[mild oracle]

@quaint zealot Whoa stuff has changed in UE5 with slots?

[quaint zealot]

Yeah, essentially slot arguments / slot creation now works around the FYourSlotType::FArguments rather than the slot type directly

For reference, working ue5-main (as of yesterday) source code for widget slots

// Widget slot
class FSlot : public TSlotBase<FSlot>
{
public:
    SLATE_SLOT_BEGIN_ARGS(FSlot, TSlotBase<FSlot>)

    SLATE_ATTRIBUTE(SomeType, SomeAttribute)

    SLATE_SLOT_END_ARGS()

    FSlot() : TSlotBase<FSlot>()
    {}

    void Construct(const FChildren& SlotOwner, FSlotArguments&& InArgs)
    {
        TSlotBase<FSlot>::Construct(SlotOwner, MoveTemp(InArgs));
        if (InArgs._SomeAttribute.IsSet())
        {
            SomeAttributeAttr = MoveTemp(_SomeAttribute._Header);
        }
    }

    TAttribute<SomeType> SomeAttributeAttr;
};

// Widget header
SLATE_SLOT_ARGUMENT(FSlot, Slots)
static FSlot::FSlotArguments Slot()
{
    return FSlot::FSlotArguments(MakeUnique<FSlot>());
}

// Widget construct
for (const FSlot::FSlotArguments& Arg : InArgs._Slots)
{
    const FSlot* Slot = Arg.GetSlot();
    SomeWidgetType* SlotWidget = static_cast<SomeWidgetType*>(Arg.GetAttachedWidget().Get());
}```

[lavish carbon]

make sure lines do penetrate the plane and not just touch it. (I might be wrong but this seems to be unrelated to slate)

[frail rover]

They do penetrate figured out what the issue was

On the preview scene i disabled physics earlier and totally forgot about it
Enabling that again made line traces work

    FPreviewScene::ConstructionValues ConstructValues;
    ConstructValues.SetCreatePhysicsScene(true);
    ConstructValues.ShouldSimulatePhysics(true);
    ConstructValues....

[fluid bobcat]

If I want to make a slate button whose icon changes depending on some underlying state, would I make its icon a TAttribute that is bound to a function? Something like TAttribute< FSlateIcon >::FGetter::CreateStatic(&MyFunctionThatReturnsIcon)

[frail rover]

it should normally be something similar to this

const FSlateBrush* SSomeClass::GetIcon() const
{
    return (Icon);
}

void SSomeClass::Construct(const FArguments& InArgs)
{
  ...
  ChildSlot
  [
    ...
                [
                SNew(WidgetClass)
                ...
                .LabelIcon(this, &SSomeClass::GetIcon)
                ...
                ]
    ...
  ]
}

[misty summit]

Hi, I was wondering if anyone has modified/extended the Composite font's to support bitmap fonts(or other font's)? I'd like to implement msdf font for ui stuff, and I see umg/slate font's need to be composite's in order to be used.

[mild oracle]

I haven't but I am very interested in your solution!

[misty summit]

well i've decided to abandon modifying composite font. it is pretty hardcoded to expect ttf/otf files as far as I can tell. And changing any header related to them seems to trigger a 40+min recompile, which is too long for the trial and error method of figuring out how everything is pieced together. So my new approach now is basically to build my own font object, and then create my own slate widget and draw text that way instead. I have my font stuff done atm, working on figuring out how slate draws things currently.

[pastel basin]

Hello.

What is "Atlased Texture Interface" and why Stale Brush can accept Materials and Textures to Image object slot, but Image Object itself - can't?
I see now, it's an UObject, but Slate somehow filters the Textures and Materials.

[quaint compass]

Hi, does anybody know if there is a callback for when your game's window is resized? I googled and couldn't find anything and I also searched the documentation and couldn't find anything.

[quaint compass]

someone gave me the answer FViewport::ViewportResizedEvent

[narrow terrace]

You can get it from the game viewpoint client

[random void]

Question, is it possible to add a slate widget child to a umg widget?

[orchid nova]

I vaguely remember seeing an UMG widget for containing Slate widgets

Alternatively you could just wrap your widget into a UMG widget which should be relatively straightforward

[low bluff]

You'll probably have to put your Slate widget into a UWigdet (Not UUserWidget).

[random void]

thanks, I found something:
Native Widget Host
This is a container widget that can contain one child Slate widget. This should be used when all you need is to nest a native widget inside a UMG widget.
https://docs.unrealengine.com/4.27/en-US/InteractiveExperiences/UMG/UserGuide/WidgetTypeReference/

https://docs.unrealengine.com/4.26/en-US/API/Runtime/UMG/Components/UNativeWidgetHost/

[craggy current]

So I'm trying to get into slate - the overview i was following said you could click on the links in the widget reflector to open that section of code in visual studio. For me it just switches the window to visual studio and thats it. It wont find the line of code even if the file is already open in visual studio. its not even hanging or anything.
Is this something i can fix or did i just completely misunderstand in the first place

[mild oracle]

Does clicking on stuff in the editor take you to the right line/function for other stuff? e.g. double-clicking on a node in Blueprints take you to the right function?

[quaint zealot]

Does anyone got working code for UE5-main slots ?

I'm doing something really simple where I just pass slot widgets to a child widget's construct

Somehow I keep getting crashes in the widget's Destroy

I also have no idea when to call the slot's new Construct call

[quaint zealot]

Okay I finally got it.

// Slot
class FSlot : public TSlotBase<FSlot>
{
public:
    SLATE_SLOT_BEGIN_ARGS(FSlot, TSlotBase<FSlot>)
    SLATE_ATTRIBUTE(FText, Example)
    SLATE_SLOT_END_ARGS()
};

// Slot user header
static FSlot::FSlotArguments Slot()
{
    return FSlot::FSlotArguments(MakeUnique<FSlot>());
}

// Slot user Construct
for (FSlot::FSlotArguments& Arg : const_cast<TArray<FSlot::FSlotArguments>&>(InArgs._Slots))
{
    FText Example = Arg._Example;
        TSharedPtr<SWidget> Widget = Arg.GetAttachedWidget();
}```

[viral sundial]

I’ve only been looking at slate for a few days but is there any documentation that explains the correct way to do local and absolute transforms?

I.e. convert correctly between local absolute space.

When 2 widgets may be in different transform hierarchies.

[viral sundial]

I’m trying to draw a line between 2 widgets but it’s really unclear if the coordinates are supposed to be in local space or absolute space.

Ok I think I have a better handle on how this works now.

[sand frigate]

Is there a way to get IPropertyHandle outside of IDetailCustomization? I wanted to put FText edit area outside of details panel (e.g. straight onto a graph node), by using an existing slate class (STextPropertyEditableTextBox).

[vale solar]

Is there a proper way to clear out a ComboBox? Ive got a setup where sometimes that box can be be empty and Id like to clear it out, but just calling ClearSelected() before I update the elements leaves what was previously selected in there

I guess as I talk this out though the better option might be to hide that box entirely if theres no valid selection

...which Im not entirely sure how to do either heh

[vale solar]

Which I have now resolved by finding the .Visibility_Lambda() option. This chat is great for Rubber Ducking! 🙂

[warm vault]

Is it possible to attach a Slate widget to actor? so it would be drawn in 3d space

[orchid nova]

The easiest way to do that would probably be to use a widget component with a UMG widget which wraps your Slate widget

[warm vault]

thnakas

[warm vault]

can slate widget be rendered on MacBook Pro touchbar?

id buy this plugin

[quaint zealot]

With Apple killing it off I probably wouldn't

[orchid nova]

^ yeah touchbar is ded. Although it seems it had some fans, nearly everyone I've talked to had issues with it so probably for a good reason

[balmy vortex]

Where can I find learning resources for Slate?

[quaint zealot]

The editor source code is the main one

After all it's what you're doing with it usually

[mild oracle]

I've seen this "Display UIExtension Points" option, and when it's enabled it shows a bunch of strings. Does anyone know how to use them?

(source http://wlosok.cz/editor-plugins-in-ue4-2-a-few-tips/)

[split laurel]

These are for FExtenders usually. You can specify a section when adding toolbar options, and naming one of these extension points will add your buttons there

[rain heron]

does someone have a link to a good description of the different ways to style widgets (including custom widgets)?
like when its best to use args/attributes, when to use that style stuff like FCoreStyle that reference the assets in the VFS, and when to create a Style-Struct and when not....

also is there a better way to do auto-focus for than:

RegisterActiveTimer(0.016f, FWidgetActiveTimerDelegate::CreateLambda([this](double InCurrentTime, float InDeltaTime) {
    FWidgetPath FocusMe;
    FSlateApplication::Get().GeneratePathToWidgetChecked( SearchBox.ToSharedRef(), FocusMe );
    FSlateApplication::Get().SetKeyboardFocus( FocusMe, EFocusCause::SetDirectly );
    return EActiveTimerReturnType::Stop;
}));

?

[median pollen]

well, I'm getting an error
Here is the problem line

SAssignNew(DescriptionsListViewWidget, SListView<TSharedPtr<FDescriptionsListItem>>)

here is DescriptionsListViewWidget

TSharedPtr<SListView<TSharedPtr<FDescriptionsListItem>>> DescriptionsListViewWidget = nullptr;

and here's FDescriptionsListItem

USTRUCT()
struct LIVERYEDITORTOOL_API FDescriptionsListItem
{
    GENERATED_BODY()

    FDescriptionsListItem() : Index(0), Name(FString("")), Data()
    {}

    int Index;
    FString Name;
    FBMLiveryDescription Data;
};

This is the build error I'm getting

  LiveryEditorToolView.cpp(82): [C2664] 'TDecl<SListView<TSharedPtr<FDescriptionsListItem,ESPMode::NotThreadSafe>>,RequiredArgs::T0RequiredArgs> &TDecl<SListView<TSharedPtr<FDescriptionsListItem,ESPMode::NotThreadSafe>>,RequiredArgs::T0RequiredArgs>::Expose<SListView<TSharedPtr<FDescriptionsListItem,ESPMode::NotThreadSafe>>>(TSharedPtr<SListView<TSharedPtr<FDescriptionsListItem,ESPMode::NotThreadSafe>>,ESPMode::NotThreadSafe> &)': cannot convert argument 1 from 'const TSharedPtr<SListView<TSharedPtr<FDescriptionsListItem,ESPMode::NotThreadSafe>>,ESPMode::NotThreadSafe>' to 'TSharedPtr<SListView<TSharedPtr<FDescriptionsListItem,ESPMode::NotThreadSafe>>,ESPMode::NotThreadSafe> &'
  LiveryEditorToolView.cpp(82): [C2664] Conversion loses qualifiers
  DeclarativeSyntaxSupport.h(1068): [C2664] see declaration of 'TDecl<SListView<TSharedPtr<FDescriptionsListItem,ESPMode::NotThreadSafe>>,RequiredArgs::T0RequiredArgs>::Expose'

and I guess this is FBMLiveryDescription

USTRUCT()
struct FBMLiveryDescription
{
    GENERATED_BODY()

    UPROPERTY(EditAnywhere, Category = "Description")
    TEnumAsByte<EBMLiveryWorkspace> Workspace;

    UPROPERTY(EditAnywhere, Category = "Description")
    TArray<FBMLiveryGroup>            Groups;
};

[wild pumice]

How do you construct a slate widget to use with Gameplay Tag Container?

[median pollen]

I found out what was wrong with mine, the construct function was a const

[median pollen]

and here's another error, when trying to spawn an asset entry box in my slate, created a widget function

TSharedRef<SWidget> SLiveryEditorToolView::CreateDataAssetPicker(TSharedPtr<SObjectPropertyEntryBox> PropertyEntryBox)
{
    return SAssignNew(PropertyEntryBox, SObjectPropertyEntryBox)
        .AllowedClass(UCustomLiveryData::StaticClass())
        .ObjectPath(this, &SLiveryEditorToolView::GetDataPath)
        .OnObjectChanged(this, &SLiveryEditorToolView::OnDataObjectSelected)
        .AllowClear(true)
        .DisplayBrowse(true)
        .DisplayThumbnail(true)
        .ThumbnailPool(AssetThumbnailPool)
        .DisplayUseSelected(true)
        .DisplayCompactSize(false)
        .EnableContentPicker(true);
}

called it here

TSharedRef<SWidget> SLiveryEditorToolView::CreateToolBox()
{
    return SNew(SVerticalBox)

        + SVerticalBox::Slot()
        .Padding(4.0f)
        [
            CreateDataAssetPicker(DataAssetEntryBox)
        ]

and now getting this weird error

  unresolved external symbol "__declspec(dllimport) public: void __cdecl SObjectPropertyEntryBox::Construct(struct SObjectPropertyEntryBox::FArguments const &)" (__imp_?Construct@SObjectPropertyEntryBox@@QEAAXAEBUFArguments@1@@Z) referenced in function "public: class TSharedRef<class SObjectPropertyEntryBox,0> __cdecl TDecl<class SObjectPropertyEntryBox,struct RequiredArgs::T0RequiredArgs>::operator<<=(struct SObjectPropertyEntryBox::FArguments const &)const " (??_3?$TDecl@VSObjectPropertyEntryBox@@UT0RequiredArgs@RequiredArgs@@@@QEBA?AV?$TSharedRef@VSObjectPropertyEntryBox@@$0A@@@AEBUFArguments@SObjectPropertyEntryBox@@@Z)

I'm really stumped on it, been trying a few things

[weary egret]

did you add module: PropertyEditor?

[grim radish]

Hey guys, how do you force a slate widget to redraw itself?

[quaint zealot]

SlatePrepass(FSlateApplication::Get().GetApplicationScale());

[rain heron]

I'm not sure but i simply call the invalidate function which sems to work for me

[warm vault]

How to call a C++ function or BP function from Javascript that is run in SWebBrowser?

[warm vault]

https://docs.unrealengine.com/4.27/en-US/API/Runtime/WebBrowser/SWebBrowser/BindUObject/

[warm vault]

There is no way to evaluate JavaScript in SWebBrowser and receive the output on Blueprint/C++ side? Besides making the UObject with callbacks and calling a JavaScript that returns results via those callbacks?

Something like runJavasript(lambda<T>)

[orchid nova]

sounds likely since browsers in general aren't designed to expose escape hatches for other applications

[craggy current]

Thanks for your reply (sorry it's been a hot minute, I had to shelve this project for a little bit)

I can open any blueprint functions that I create by double clicking. If I try to open one thats built-in it pops up with a "reading c++ symbols" thing on the bottom of the screen and nothing else happens

As a small update, I finally saw that when I try to open anything from the widget reflector I get an error that its looking in the complete wrong place for the code file - there isnt even any "Build" folder in the root of my D drive, or anything else to do with unreal so im not sure where it's getting this path from or how to fix it. Just to be thorough I reinstalled 4.26.2 and nothing changed

[quaint zealot]

That's the source code for when the engine was built @craggy current

IIRC you need debug symbols or something to open from editor ? Easier to just open Visual and search for that file name

[median pollen]

Hello, so I'm trying to bind a value to a TAttribute, so that I can change a value in a Custom Data Asset and have it change in my SlateUI, and vice versa

Currently, I have a CreateSP function that does this for me

Val = TAttribute<int>::Create(TAttribute<int>::FGetter::CreateSP(this, &SLiveryEditorToolView::GetTestValue));

but this calls every tick from my understanding

and would not work with TArrays

[quaint zealot]

Why wouldn't it work with arrays ? Also you can make it a lambda, which will likely compile down to literally reading the variable

[median pollen]

I'm sorry, quite new to slate, how would we bind it to lambda?

[quaint zealot]

Using CreateLambda instead and passing the code from GetTestValue directly

And updating on tick is perfectly fine, for the record

[median pollen]

yeah that's fair, so I could just do this?

Val = TAttribute<int>::Create(TAttribute<int>::FGetter::CreateLambda(this, TestCustomData->Pattern.Colours->R));

assuming that value is the one I return from the getter

[quaint zealot]

Probably more like

Val = TAttribute<int>::Create(TAttribute<int>::FGetter::CreateLambda([this] { return TestCustomData->Pattern.Colours->R);} ));```

[median pollen]

oh nice! Thank you kindly

and would this be the same for TArrays?

[quaint zealot]

Works for any type, dunno how you want to show the array

[median pollen]

I'll give it a go, thanks for the help! I appreciate it!

@quaint zealot yeah, it doesn't seem to update correctly when adding new elements to the array in the custom data asset

here is my code

DescriptionsList = TAttribute<TArray<FBMLiveryDescription>>::Create(TAttribute<TArray<FBMLiveryDescription>>::FGetter::CreateLambda([this] { return TestCustomData->Descriptions; }));

[quaint zealot]

Like I said, depends on how you want to show the array. For list views you probably want to use the widget's tick event to copy the array or a hash of it, and refresh the list view any tile it's changed

[median pollen]

so the "every time it's changed" part is what I'm having issues with, how do we know when thats happening?

[quaint zealot]

Depends on the array and contents, but it could be a hash of the array contents for example.

[median pollen]

yeah, the array's contents is just a struct with a TEnumAsByte and another TArray

[blazing oak]

Hello, I would like that my plugins uses the same docking system used by the editor. I saw that it's needed to use: SDockingArea and SDockingSplitter but it doesn't seems to work well with slate, doesn't compile:

    return SNew(SDockTab)
        .TabRole(ETabRole::NomadTab)
        [
            SNew(SDockingArea)
            [
                SNew(SHorizontalBox)
                    + SHorizontalBox::Slot()
            ]
        ];

This is the compilation error:

No 'operator []' matches arguments of type 'SDockingArea::FArguments' and 'TSharedRef<SHorizontalBox, ESPMode::Fast>'

It's like the SDockingArea doesn't implement to operator[] function, any idea?

[limber stump]

I dont know what dockingarea is but looking at engine code to see how it's used there is probably your best bet.

[blazing oak]

@limber stump I'm trying doing it, though it doesn't seems to be so obvious or however it doesn't use slate.. at least it doesn't seems so 🤔

Btw, what I'm trying to do is create the plugin UI so that it's possible to change the size of the side menu, exactly like for any window (like the blueprint editor or the skeleton asset editor)

To do it, do I need to use the dock or exist another way?

[median pollen]

Hi Slate peeps, how do I change a button's visibility on the fly, I've set the .Visibility to a TAttribute but have no idea how to set the Tattribute to update the button's visibility

sorry, bit of a beginner

[wide dragon]

What should I google to figure out building my own asset editor window? Specifically, an asset editor window that renders a scene in real-time.

Like the Viewport in the blueprint editor.

[limber stump]

Without knowing how much you know or have already done:

• create an editor module
• create a factory and asset type actions class for the class you wanna customize
• create an asset customization for the class
• add a viewport to that customization.
  Start by googling which of these you are unfamiliar with first. Little is online about the actual viewport itself. I would try to look at how assets like static meshes or materials add a viewport to their asset and try to copy the basics from there. The other three steps are quite well covered online. Cairan Steverink's blogs are pretty good at covering the bare minimum to set things up

[signal raven]

Do I need to use slate to optimize UMG? Can I use plain C++ functions for the BPs using heavy forloops?

[mild oracle]

It depends on what you're doing. You don't necessarily need to use Slate to move stuff into C++.

[warped kestrel]

sup slate wierdos, cross posting this from main chat:
trying to track a socket off a skeletal mesh w/ a new cpp UUserWidget
basically GetSocketLocation() -> ProjectWorldToScreen()
but - there's a problem w/ scaling? seems like UCanvasPanelSlot::SetPosition() is expecting different coordinates than what PWTS() returns
haven't investigated DPI yet, but converting to widget local coords didn't help
any ideas? for context SetPosition(ViewportSize) puts it about 3/4 the way to the bottom corner iirc, so scaling is off by like 1.3x

[craggy holly]

Almost certainly going to be DPI scale. Also you probably want to project to the viewport not the screen.

Screen will encompass the whole window, which in editor also means toolbars etc.

I prefer projecting to normalized viewport position then set anchors instead

Using FSceneViewProjectionData::ComputeViewProjectionMatrix() for projection and FSceneViewProjectionData::GetConstrainedViewRect() for viewport size.

[warped kestrel]

@craggy holly could you elaborate? I'm maybe not following
LocalPlayer->GetProjectionData(LocalPlayer->ViewportClient->Viewport, eSSP_FULL, ProjectionData);
FSceneView::ProjectWorldToScreen(SocketWorldLocation, ProjectionData.GetConstrainedViewRect(), ProjectionData.ComputeViewProjectionMatrix(), SocketScreenLocation); should accomplish all that right? it didn't work, same issue

well, except using anchors. I'm confused ab that

[warped kestrel]

never mind, it works when divided by the DPI

[median pollen]

Hello there slateheads, I've just assigned a variable to a cpp TSharedPtr<SListView<TSharedPtr<FDescriptionsListItem>>> widget, was wondering if there was a simple way to add an item to that list after pressing a button

this is the FDescriptionListItem struct by the way

USTRUCT()
struct LIVERYEDITORTOOL_API FDescriptionsListItem
{
    GENERATED_BODY()

    FDescriptionsListItem() : Index(0), Data()
    {}

    int Index;
    FBMLiveryDescription Data;
};

and finally, how I assign the value

+ SVerticalBox::Slot()
.AutoHeight()
.VAlign(VAlign_Fill)
.HAlign(HAlign_Fill)
[
    SAssignNew(DescriptionsListViewWidget, SListView<TSharedPtr<FDescriptionsListItem>>)
    .ItemHeight(24)
    .SelectionMode(ESelectionMode::Single)
        .ListItemsSource(&DescriptionsListViewItems)
    .OnGenerateRow(this, &SLiveryEditorToolView::OnGenerateDescriptionsRow)
]

[quaint zealot]

Add to DescriptionsListViewItems and refresh DescriptionsListViewWidget

[median pollen]

ah smart, thank you for the help again Stranger

FReply SLiveryEditorToolView::OnAddDescriptionClicked()
{
    TSharedPtr<FDescriptionsListItem> NewItem = MakeShared<FDescriptionsListItem>();
    DescriptionsListViewItems.Add(NewItem);
    DescriptionsListViewWidget->RequestListRefresh();
    return FReply::Handled();
}

@quaint zealot Would this be the way to do it?

[quaint zealot]

Something like that, yeah

[median pollen]

hm thats not liking that at all

error C3867: 'SLiveryEditorToolView::OnAddDescriptionClicked': non-standard syntax; use '&' to create a pointer to member

[quaint zealot]

That's your button code

[median pollen]

yeah

[quaint zealot]

Just do what the error says

[median pollen]

I wish I knew where it meant really..

[quaint zealot]

I mean the error specifically tells you how to fix the code

And this is a regular C++ function pointer

Might want to read up on C++ if you're writing some

[median pollen]

thanks for the help

Oh my goodness, right, it's on the button itself

I thought it was in the function

[quaint zealot]

Yeah I told you that

Look at the lines on errors

[median pollen]

yeah when you said button code for some reason my head went straight to the definition

[median pollen]

hello again! I'm looking to implement a double click renaming text block and found SInLineEditableTextBloxk, which sounds right up my alley, was wondering why it doesn't seem to respond to my double click? It could be the tablerow taking the focus, really... is there any way to allow it to select the item on the first click, but edit the item on the second?

TSharedRef<ITableRow> SLiveryEditorToolView::OnGenerateDescriptionsRow(TSharedPtr<FDescriptionsListItem> Item, const TSharedRef<STableViewBase>& OwnerTable)
{
    FString RowName = FString("Description_");
    RowName.AppendInt(Item->Index);

    TSharedRef<STableRow<TSharedPtr<FString>>> TableRow = SNew(STableRow<TSharedPtr<FString>>, OwnerTable)
        .Padding(2.0f)
        .SignalSelectionMode(ETableRowSignalSelectionMode::Instantaneous)
        [
            SNew(SInlineEditableTextBlock)
            .Text(FText::FromString(RowName))
        ];

    return TableRow;
}

this is my implementation

maybe theres a way to suppress the table rows double click functionality?

[split laurel]

you can check what's taking up input by using the widget reflector to help you debug this

[median pollen]

@split laurel thats great to know! Im pretty sure the table rows taking the input since it does get selected on the first click, im just trying to figure out how to get it not to handle the double click only

[split laurel]

typically it shouldn't take the input as you didn't click on the row but on the text. Input handlers bubble up, so that the row only attempts to consume the input when the contained widget doesn't handle it

so you are probably right that the row does take the input, but the question is why. Or perhaps you need to forward the selection to the text box

[median pollen]

Thats an excellent idea, i'll try and stop the input on the row and call it from the text

[median pollen]

So through the widget reflector, I found out both my listview and editableTextBox have focus, but the row itself doesn't have any

[split laurel]

focus is something a bit different. You can open up Widget Events (I think?) under windows in the widget reflector, then setup what events "mouse input up/down" you want to look for. In the log it will tell you what widget is eating it specifically

[jolly prawn]

Is there an easy way to get rounded edges with SNew(SBorder)? (or something similar)

[quaint zealot]

Sure, just use a rounded texture

Simple border-type Slate brush with a 9-patch texture

Set all margins to 0.33 in the brush and you're set

(or you can simple use a circle texture and setn0.5 to margins to make it a 4 patch)

[jolly prawn]

thanks 👌

[glad elm]

Anyone knows what am I missing?

    + SVerticalBox::Slot()
        .AutoHeight()
        [
            SNew(SSeparator)
            .Visibility(EVisibility::Collapsed)
        ]

I guess its related with declarative syntax support thing?

[median pollen]

is this your last slot @glad elm ?

[glad elm]

It was not, I added some more #includes and it somehow fixed

[median pollen]

ah could be that yeah, which includes were they?

ah DeclarativeSyntax

[glad elm]

#include "UObject/UnrealType.h"
#include "Widgets/Layout/SSeparator.h"
#include "Widgets/Layout/SBox.h"
#include "Widgets/Views/STableViewBase.h"
#include "Widgets/Views/STableRow.h"
#include "Widgets/Views/SListView.h"
#include "Widgets/Input/SComboBox.h"

#include "Widgets/Input/SSearchBox.h"
#include "UObject/UObjectHash.h"
#include "UObject/UObjectIterator.h"
#include "Misc/TextFilter.h"

I only had SSeperator first

Added all of those and compiled

[median pollen]

void FSCSRowDragDropOp::HoverTargetChanged()
{
    bool bHoverHandled = false;

    if (!bHoverHandled)
    {
        if (FChildActorComponentEditorUtils::ContainsChildActorSubtreeNode(SourceNodes))
        {
            // @todo - Add support for drag/drop of child actor template components to create variable get nodes in a local Blueprint event/function graph
            FText Message = LOCTEXT("ChildActorDragDropAddVariableNode_Unsupported", "This operation is not currently supported for one or more of the selected components.");
            SetSimpleFeedbackMessage(ErrorSymbol, IconTint, Message);
        }
        else if (FProperty* VariableProperty = GetVariableProperty())
        {
            const FSlateBrush* PrimarySymbol;
            const FSlateBrush* SecondarySymbol;
            FSlateColor PrimaryColor;
            FSlateColor SecondaryColor;
            GetDefaultStatusSymbol(/*out*/ PrimarySymbol, /*out*/ PrimaryColor, /*out*/ SecondarySymbol, /*out*/ SecondaryColor);

            //Create feedback message with the function name.
            SetSimpleFeedbackMessage(PrimarySymbol, PrimaryColor, VariableProperty->GetDisplayNameText(), SecondarySymbol, SecondaryColor);
        }
        else
        {
            FText Message = LOCTEXT("CannotFindProperty", "Cannot find corresponding variable (make sure component has been assigned to one)");
            SetSimpleFeedbackMessage(ErrorSymbol, IconTint, Message);
        }
        bHoverHandled = true;
    }

    if(!bHoverHandled)
    {
        FKismetVariableDragDropAction::HoverTargetChanged();
    }
}

Am I going nuts or does

FKismetVariableDragDropAction::HoverTargetChanged();

never get called?

[median pollen]

ah yeah one of them has SBoxPanel.h in them

https://docs.unrealengine.com/4.27/en-US/API/Runtime/SlateCore/Widgets/SVerticalBox/

it's the include file you need to call SVerticalBox

[median pollen]

Having a strange issue with slate, I added a new custom treeview to my slate like this

SNew(SVerticalBox)
                + SVerticalBox::Slot()
                .VAlign(VAlign_Top)
                [
                    SAssignNew(PaletteListViewWidget, SDragDropTreeView)
                    .ItemHeight(24)
                    .TreeItemsSource(&PaletteListViewItems)
                ]

I have a construct in another file like this

void SDragDropTreeView::Construct(const FArguments& InArgs)
{
    Owner = InArgs._Owner;

    STreeView<FDragDropTreeNodePtrType>::FArguments BaseArgs;
    BaseArgs.OnGenerateRow( InArgs._OnGenerateRow )
            .OnItemScrolledIntoView(InArgs._OnItemScrolledIntoView)
            .OnGetChildren(InArgs._OnGetChildren)
            .OnSetExpansionRecursive(InArgs._OnSetExpansionRecursive)
            .TreeItemsSource(InArgs._TreeItemsSource)
            .ItemHeight(InArgs._ItemHeight)
            .OnContextMenuOpening(InArgs._OnContextMenuOpening)
            .OnMouseButtonDoubleClick(InArgs._OnMouseButtonDoubleClick)
            .OnSelectionChanged(InArgs._OnSelectionChanged)
            .OnExpansionChanged(InArgs._OnExpansionChanged)
            .SelectionMode(InArgs._SelectionMode)
            .HeaderRow(InArgs._HeaderRow)
            .ClearSelectionOnClick(InArgs._ClearSelectionOnClick)
            .ExternalScrollbar(InArgs._ExternalScrollbar)
            .OnEnteredBadState(InArgs._OnTableViewBadState)
            .HighlightParentNodesForSelection(true);

    STreeView<FDragDropTreeNodePtrType>::Construct(BaseArgs);
}

and now I'm getting a LNK error

Module.LiveryEditorTool.cpp.obj : error LNK2019: unresolved external symbol "public: void __cdecl SDragDropTreeView::Construct(struct SDragDropTreeView::FArguments const &)" (?Construct@SDragDropTreeView@@QEAAXAEBUFArguments@1@@Z) referenced in function "public: class TSharedRef<class SDragDropTreeView,0> __cdecl TDecl<class SDragDropTreeView,struct RequiredArgs::T0RequiredArgs>::operator<<=(struct SDragDropTreeView::FArguments const &)const " (??_3?$TDecl@VSDragDropTreeView@@UT0RequiredArgs@RequiredArgs@@@@QEBA?AV?$TSharedRef@VSDragDropTreeView@@$0A@@@AEBUFArguments@SDragDropTreeView@@@Z)

no idea what it means

[wide dragon]

How to change the editor font? I looked at the Editor Style Set, and changed some references, but it did not work.

[pulsar remnant]

I'm trying to add an image to my loading screen. The comment line is path of my widget but i'm not sure if it works. I only need a throbber, an image and maybe a text. How i can handle it?

void UGameInstanceBase::Init()
{
    Super::Init();

    FCoreUObjectDelegates::PreLoadMap.AddUObject(this, &UGameInstanceBase::BeginLoadingScreen);
}

void UGameInstanceBase::BeginLoadingScreen(const FString& InMapName)
{
        FLoadingScreenAttributes LoadingScreen;
        LoadingScreen.bAutoCompleteWhenLoadingCompletes = false;
        //LoadingScreen.WidgetLoadingScreen = "/Game/UI/LoadingScreen";
        LoadingScreen.WidgetLoadingScreen = FLoadingScreenAttributes::NewTestLoadingScreenWidget();
 
        GetMoviePlayer()->SetupLoadingScreen(LoadingScreen);
}

[thick ice]

Hi! Does anybody know, if there is a console command to toggle slate rendering? For profiling purpose I want to disable all UMG and slate things for a while..

[median pollen]

is there a way of getting the ListView variable from the ```cpp
const TSharedRef<STableViewBase>& OwnerTable

can we just cast it?

[topaz stag]

Hi guys! I wrote a short article, but I believe it is a useful article about standalone Slate apps.
But it was written in Russian. Maybe there are Russian-speaking people in the chat, who can help me with translation into English?

[mild oracle]

Do you have a link? How bad is Google translate for Ru=>En?

[spare island]

Hey guys I want to change font size of UMG TextBlock during gameplay -> I found that I need to create new FSlateFontInfo and then use SetFont()

• Here is my current code that is not working can you point why ?
• This code is in the UWidget constructor

THE PROBLEM: it does not changes font when start game

const FString FontPath = FString ("/Game/UI_Assets/Fonts/MyFont"); FSlateFontInfo NewFontInfo(FontPath,96); MMCreditsBtnTxt->SetFont(NewFontInfo);

[mild oracle]

If you right click on the asset and choose "Copy Reference" it should give you the correct path

[spare island]

@mild oracle thanks for reply but still not working, I'm seeing this every time...

And here is the current code .. I guess I'm doing something else wrong..

[spare island]

ok JFYI @mild oracle I made it working with these 2 rows .. I guess I'll try clean new project to see if it will work with the path something smells .. why I can't get the reference by path... Thanks , btw I watched you videos !! Great stuff !!

[young sleet]

Hey is it possible to get a specific widget type from a IDetailLayout and somehow customize it?

For example I can get a named property or widget row, and configure it.

I want to get the reference to a spawned overlay SClassViewer, and update the items that are spawned in the combo box.

But I am having trouble getting its handle, and I don't understand how I would go about it.

I have a TArray<UObject*> property;, of which I want to apply a custom filtering.

[hot notch]

@spare islandOut of curiosity. Is there any reason you can't just make a map or array of FSlateFontInfo structs to get your data from and set it from blueprint/editor? Hardcoding stuff is a little brutal.

[young sleet]

I find I can use property.asArray to get a handle to the array itself.

For example, deleting 0th element.

I still have not found a way to get a handle to the asset picker that is created as a floating window.

I want to target this asset picker with custom filtering.

Its an SListViewSelectorDropdownMenu.

[young sleet]

So pretty much its a custom window. I guess I cannot customize this from the property 😦

All I want is custom filtering for a TArray UObject* property.

[young sleet]

Follow up question: Is there any way to modify specific widgets, within a property? For example if I wanted to change the button size of the SDetailSingleItemRow in a SListView created via a normal TArray UPROP

I just don't see how to walk down from a property handle down into its children properly.

It says array elements cannot be accessed via "GetChildHandle"

[hexed plank]

Is there a way to "mask" something in slate?

Like if I'm drawing a square image in "OnPaint" but I want to give it rounded translucent borders?

Or like an opacity mask for slate

[craggy holly]

You apply a brush to it, i.e. a texture or a material

[median pollen]

Hey Slaters!
I'm trying to add an asset's thumbnail to my slate, so I've got

    UTexture2D* AssetTexture = *AssetItem;
    FAssetThumbnailConfig ThumbnailConfig;

    ThumbnailConfig.bAllowFadeIn = true;
    ThumbnailConfig.bAllowHintText = false;

    TSharedPtr<FAssetThumbnail> AssetThumbnail = MakeShareable(new FAssetThumbnail(AssetTexture, 64, 64, nullptr));

    TSharedPtr<SWidget> Thumbnail = AssetThumbnail->MakeThumbnailWidget(ThumbnailConfig);
```But it doesn't render out the thumbnail image from the asset I want, just the Texture type thumbnail. (Here AssetItem is the asset in question)

So, just for clarity, I'm getting this

when I want this

[grave parcel]

Hi! I was wondering if something like this could be created more or less easily with Slate:

a "slider" of sorts that controls 3 different values

[median pollen]

@grave parcel It would be more pleasant making this in UMG tbh

[grave parcel]

hmm

[median pollen]

Is there a reason you want it for slate?

[quaint zealot]

Yeah Slate is for building fundamental widgets

This is just two brushes and three text blocks

[grave parcel]

I was under the impression that Slate was for more "complicated" things

but I was wrong 😄

[quaint zealot]

Slate is for things you can't build with UMG

So yeah

[grave parcel]

hehe

[median pollen]

^ this

[quaint zealot]

But this is very doable with UMG

[grave parcel]

thank you

I will try 🙂

[median pollen]

also @quaint zealot would you know anything about the thumbnail problem I'm having?

[quaint zealot]

No, i don't

[median pollen]

ah alright, thanks anyway

[median pollen]

So, for anyone interested, I didn't specify a thumbnailpool when creating my assetthumbnail

FLevelEditorModule& LevelEditorModule = FModuleManager::LoadModuleChecked<FLevelEditorModule>("LevelEditor");
TSharedPtr<FAssetThumbnailPool> ThumbnailPool = LevelEditorModule.GetFirstLevelEditor()->GetThumbnailPool();
TSharedPtr<FAssetThumbnail> AssetThumbnail = MakeShareable(new FAssetThumbnail(AssetTexture, 64, 64, ThumbnailPool));

works perfectly now!

[kindred nova]

Is it possible somehow set "Min row height" for TreeTable ?

[split laurel]

What keeps you from adding a box inside the individual row with a minimum height?

[craggy holly]

Is there an injection point where I can run some code before slate does the layout pass for a given frame? I want to "project" widget position from world-space to screen-space, and possibly change the size of that widget depending on that projection. I've realised Tick etc. runs after layout has been processed for that frame, and I'm doing the work there currently, but there's a frame of latency and I suspect I'm invalidating things a lot by doing that.

The hard part is exposing that to UMG in some way. All I can think of is binding some functions to events exposed by the slot, but dynamic delegates/bindings aren't exactly quick.

Guess I want some kind of "pre layout pass" function for UMG, not sure that exists?

[craggy holly]

Actually.. doesn't matter 😄

[abstract spindle]

is there an example of how I can add a submenu / menu entries to toolbar button? I only see example for modifying the editor menus or adding a pop up window for plugins.

[narrow terrace]

I was gonna say try on paint... But glad you ended up finding a solution, mind me asking or NDA?

[narrow terrace]

In the Slate Examples(Slate Test Suite) has an example of that

[mild oracle]

What did you end up doing?

[abstract spindle]

where is that? content examples? or buried in the engine?

[stuck jewel]

@abstract spindle I expect they're talking about Window > Developer Tools > Debug Tools > Test Suite ... you can maybe find some text in it and ctrl-shift-f your way to the actual code

I don't know where a specific example you'd be looking for is though 😄

[abstract spindle]

yeah just found it, and no this doesn't give me that example

this is likely what they're talking about, but I'm looking to modify a toolbar via c++

[stuck jewel]

are you talking about adding things to or modifying e.g. the main toolbar or entries in one of the submenus of a main toolbar button? like here?

[abstract spindle]

made an editor toolbar plugin, want to know how to make this a drop down menu

void FQuestVRToolsModule::RegisterMenus()
{
    // Owner will be used for cleanup in call to UToolMenus::UnregisterOwner
    FToolMenuOwnerScoped OwnerScoped(this);

    {
        UToolMenu* Menu = UToolMenus::Get()->ExtendMenu("LevelEditor.MainMenu.Window");
        {
            FToolMenuSection& Section = Menu->FindOrAddSection("WindowLayout");
            Section.AddMenuEntryWithCommandList(FQuestVRToolsCommands::Get().PluginAction, PluginCommands);
        }
    }

    {
        UToolMenu* ToolbarMenu = UToolMenus::Get()->ExtendMenu("LevelEditor.LevelEditorToolBar");
        {
            FToolMenuSection& Section = ToolbarMenu->FindOrAddSection("Settings");
            {
                FToolMenuEntry& Entry = Section.AddEntry(FToolMenuEntry::InitToolBarButton(FQuestVRToolsCommands::Get().PluginAction));
                Entry.SetCommandList(PluginCommands);
            }
        }
    }
}

it should be generated automatically with the right keywords without having to manually create slate stuff

but there's no info anywhere

@stuck jewel

[stuck jewel]

yeah been a long time since I've tried anything in there and IIRC all I did was modify an existing menu... remember some stuff with MenuExtender and AddMenuExtension but not sure if that's the same process needed for a new menu

[abstract spindle]

there's different functions for existing menus vs plugin menus

[craggy holly]

@mild oracle @narrow terrace still figuring it out really.. currently the idea is to push a slate event in OnArrangeChildren both pre and post projecting each slot, but it's still a bit tricky.

On that subject though, does anybody know why SConstraintCanvas etc. arranges it's children twice? Once during OnArrangeChildren then again during OnPaint

It's doing all that sorting work at least twice a frame

[narrow terrace]

I would honestly need to take a look since it's been a while since I've looked at the canvas, currently returning from a wedding...

[craggy holly]

There's also no way to get geometry during a custom prepass is there?

Essentially I have a panel whose geometry/desired size is inferred from it's parent - so I want to be able to get the allotted geometry of the parent during the widgets' prepass, so that child widgets can modify their reported desired size during the first prepass.

[spare bane]

is there a way to use a variable for richtextstyles? I want to plugin a color variable for the text

[narrow terrace]

You could try caching it and basing it off of the prev frame, but yeah you can't get geo before it's been calculated because it HAS to account for child geo too and such

[narrow terrace]

You could do this using the format function and feed in the correct color style that you want into that, so it works like a normal rich text block but the text would be more dynamic

[spare bane]

you mean format text? I'm already doing that, the problem is the color isn't just blue, red, greed etc, it could be any color with RGB values being widely varied, is there a way I can plugin a slate color, to the text?

it's for a chat message, I want the players name to be the same color as their team, and team colors are custom so they could be any color

the reason I'm using rich text, is so the message wraps correctly and doesn't bug chat

[craggy holly]

Yeah, realised I'm stuck in a loop. The child widgets' desired size may depend on the parents geometry, so I'm stuck really.

[craggy holly]

Got there in the end...

The crux is that if a widget wants to change size, it just needs to call "Force Layout Prepass", which prevents any 1/2 frame glitches as it switches up.

[narrow terrace]

I COMPLETELY FORGOT ABOUT FORCE LAYOUT PREPASS! I'm glad that fixes it at least

[sacred venture]

https://gyazo.com/0f92d2eb22cb62b2f5a8850f3435b1ec

can i have a custom row that obeys that splitter?

nevermind, had a custom row because i wanted the expandable area, making it a group instead was easier

[sacred venture]

when i have a customize header, my property shows indented and with the "drag item" icon

top one has no header, bottom one has

any way to remove it?

It is a child of an array, but its expanded to not show the array property

        [
            SNew(STextBlock)
            .Text(FText::FromString(AssetName))
            .Font(CustomizationUtils.GetRegularFont())
        ]```

[craggy holly]

Can anybody confirm that Paint Geometry is in Desktop Space rather than Window Space?

Trying to use FSlateDrawElement::MakeLines(), and I have to subtract FPaintArgs::GetWindowToDesktopTransform() in order for them to draw in the correct plane, which is making my head spin

The coordinates I'm painting are in Viewport-Absolute Space

[maiden tapir]

So this might be a dumb question, but using the Renderdoc plugin and capturing a frame seems to exclude any Slate UI being rendered to screen. It seems to only include the Scene capture. Is there a way to use Renderdoc with Slate/UMG that I'm missing?

[maiden tapir]

I've asked on the Renderdoc discord and have been told its up to the plugin to determine the start/end of capture, so am currently looking through the plugin documentation

[hot notch]

Having a bit of a derp. How do I set a Slate's Slot to use Size Fill?

[hot notch]

Ah. Got it figured out. Didn't realize I needed autowidth.

[mild oracle]

I'm trying to work out what code in the engine is responsible for changing which input box is selected in property panels when pressing Tab, but not having much luck.

I've tried searching for all instances of EKeys::Tab but that didn't pull up much. Does anyone have any suggestions?

[sacred venture]

what about EUINavigation::Next

[mild oracle]

Ooh, I didn't know about this one, I'll take a look

[sacred venture]

I just remember setting up my own navigation rules in my game, but maybe its the same for editor

[mild oracle]

That was it! Thank you so much!

[undone knoll]

Hey guys, does anybody know of a good youtuber who provides slate tutorials?

[quaint zealot]

The editor source code is a great one

Sorry, not a Youtuber, but the real doc 😛

Slate isn't game stuff so it doesn't get a lot of tutorials

[hot notch]

A little confused with SButton. How are you supposed to be able to create a slot for it?

+SButton::Slot() doesn't seem to work.

[quaint zealot]

It only has one

So []

[hot notch]

How do you change the slot properties on that?

[quaint zealot]

There aren't any

[hot notch]

Assuming UMG. If I put Text in a button I can set it's padding, and alignments.

Just wondering how to do the same in Slate.

[quaint zealot]

Pretty sure you need another widget for that

Personally I subclass SButton so I can do ChildSlot .VAlign(VAlign_Center) .HAlign(HAlign_Center) [

[hot notch]

Just started learning actual Slate. 😄 Maybe it's time to ditch SButton anyhow. Couple things about it I wanna fix.

[hot notch]

On a side note though. Apparently you just specify it directly on the button instead of the slot.

SNew(SButton).HAlign(HAlign_Fill).VAlign(VAlign_Fill).ContentPadding(FMargin(6.f))
[
  SNew(STextBlock).Text(FText::FromString("X")).Font(Font)
]

[quaint zealot]

Ah, yeah, makes sense

Personally i've got a button class that inherits SButton and reimplements essentially half of it

[mild oracle]

Does anyone know what is being called when doing this drag and drop interaction in the editor?
https://twitter.com/_benui/status/1469479577646866432

ben🌱ui (@_benui)

It'd be neat if I could drag a group of assets onto an exposed TArray<TSubclassOf<T>> in #UnrealEngine
Maybe it's another pull request I have to make? https://t.co/KxxwxcCFKF

▶ Play video

Twitter · Dec 11, 2021, 1:30 AM

[obsidian surge]

hmm I believe you would need to take a look at SDropTarget class

There are methods such as:

    bool AllowDrop(TSharedPtr<FDragDropOperation> DragDropOperation) const;

    virtual bool OnAllowDrop(TSharedPtr<FDragDropOperation> DragDropOperation) const;
    virtual bool OnIsRecognized(TSharedPtr<FDragDropOperation> DragDropOperation) const;

[mild oracle]

Neat, I'll try setting breakpoints there and start poking around

[nocturne marsh]

I'm trying to access the selected folders in the world outliner, but I've seen GetSelectedFolderNames in SSceneOutliner is private, is there any other way to access this data or get an equivalent one?

[inland flower]

@mild oracle Saw your blog post on List View, nice one! A couple of times I've tried to use it though, I run into the same limitation: headers. If you work around it by having multiple list views, separated by header widgets, you don't get an unbroken scrollbar for scrolling the whole thing.

I've tried 2 methods to get around this. One is to set a bool on the list item object to tell the generated widget to show/hide parts of the widget depending on whether it's a header or not. The other is to have the generated list item be a simple named slot and in On Entry Generated, call a function which tells it to construct a header and slot it, or construct a regular item and slot it. It feels hackish though, and I'm not satisfied. Also, when I tried it with a tree view, the list items would randomly reorder themselves, moving out from under their headers.

What I think I might try next is subclassing listview and instead of Add Child, a new function that receives a header object and entire batch of entry objects at once to draw under that header, so that the association and ordering can be preserved. The other limitation that would have to be removed is all generated entries using the single hardcoded Widget Entry Class property. A TMap of Object Class to Widget Entry Class would allow any passed-in object type to produce a corresponding widget for that object.

[wild pumice]

I'm developing a custom graph editor following Flow Graph by MothCocoon but when I save the graph, close and reopen Unreal Engine, all connections disappear. What could possibly be the reason the connections not saving with the asset?

[wild pumice]

After debugging it looks like UEdGraphPin::LinkedTo is empty after reopening editor. But why...🤔

[wild pumice]

Issue fixed. Was missing these implementations:

// variants of K2Node methods
void RewireOldPinsToNewPins(TArray<UEdGraphPin*>& InOldPins);
void ReconstructSinglePin(UEdGraphPin* NewPin, UEdGraphPin* OldPin);
// --

[cobalt hare]

why is the umg drag drop operation so impenetrable.. i just want to make a slate drag drop operation that is a drop in replacement that doesn't have position lerping at the start of the drag

but UMGDragDropOperation is totally locked down

[mild oracle]

I think I ended up making my own drag drop operation class that implemented the same interface.
Edit: OK yeah I made my own that subclasses FGameDragDropOperation

I used it to make a drag and drop vertical box that is basically a modified version of SDragAndDropVerticalBox

[cobalt hare]

i'm trying to do this now, just need to figure out how to wire into the creation of drag drop operations

is your code online anywhere?

[mild oracle]

Sorry no it's made for work and I don't have permission to open-source it (yet)

I can post little bits I guess:

FReply UBYGDragAndDropVerticalBox::HandleDragDetected( const FGeometry& MyGeometry, const FPointerEvent& MouseEvent, int32 SlotIndex, SVerticalBox::FSlot* InSlot )
{
    // Find the thing we're trying to drag
    // ...
    return FReply::Handled().BeginDragDrop( FBYGVerticalBoxDragDropOp::New( /*...*/

Basically I would recommend looking at how HandleDragDetected is used in other places

@cobalt hare SHierarchyViewItem.cpp has some good examples of HandleCanAceptDrop

[cobalt hare]

🙏 thanks ben, this is really helpful

[mild oracle]

you're welcome! I'll see if I can get our stuff cleaned up and open-sourced over the break maybe... maybe?

[formal fossil]

<@&213101288538374145> hmm already banned i guess 🤔

[tawny badger]

:warning: Failed to send a DM. User will not be notified.

:no_entry_sign: ROYALKINGSJ#2266 was banned.

[celest locust]

is there a way to remove the arrowhead on the spline that connects 2 node pins?

[glad elm]

Is there any way to implement a custom slate for USTRUCT()s?

I have a struct exposed to BPs like this

Weight variable determines the count of the element in the game, when they're utilized in C++. Since its a dynamic value, I want my designers to see something like this:
If total count would be 100, with 0.05 of Weight you would get ~5 enemies in the game

But I don't want to write a something from scratch, if possible I'd like to modify the default USTRUCT() panel

[low bluff]

@glad elm Details customization

Is the magic word

You can make one per Object or Struct

And that allows you to design how your struct gets visualized and also react to certain values changing

I think a good candidate for looking at an example is the FDataTableRowHandle

It creates a drop-down from the Datatable property and saves the selection in a name variable iirc

[glad elm]

🥳 Great, thanks for explaining eXi

[low bluff]

No biggy. Sadly don't have an example at hand. haven't used them in a while

I think your register them in your module

Fwiw

Files in engine are usually called structname+customization or so

You can then just follow around where the use the struct and the customization type

It's straight forward to add it. The slate part is the shitty part

[glad elm]

Np, "magic keyword" was enough on its own 🙂 I found some GAS examples (FAttribute etc.) -- they serve as a good documentation right now

[low bluff]

Coolio

[stuck jewel]

Property customization for an individual struct, not details customization though. They're different. Very confusing when you're just learning

@glad elm

[glad elm]

I guess 'detail' customization is for UObjects, right?

or for "assets" to be clear

[cobalt hare]

has anyone tried using UWidget::TakeDerivedWidget()? i'm trying to replace the object widget used by a subclass of UUserWidget with my own subclass of SObjectWidget following this comment in Widget.h:
For extremely special cases where you actually need to change the the GC Root widget of the constructed User Widget - you need to use TakeDerivedWidget you must also take care to not call TakeWidget before calling TakeDerivedWidget, as that would put the wrong expected wrapper around the resulting widget being constructed.

but i can't figure out a reliable place to call TakeDerivedWidget before the UMG blueprint editor starts invoking functions that call TakeWidget

[stuck jewel]

sorry I screwed off but basically a details customization allows you to modify the entire details pane (which basically will always be for a uobject, yes) and a property customization allows you to change how an individual property can be automatically drawn within its assigned row in a details pane (like an FVector, but also IIRC this can be used to affect how an instanced UObject property is drawn when a UObject is used as a property too)

[fossil kayak]

How do I expose slate widget to umg so I can use it in widget blueprint?

[mild oracle]

You can't put UPROPERTY in slate afaik, so you can't expose it without having to duplicate each Slate property in your UMG wrapper, afaik. Look how UButton and SButton work.

If you're just talking about embedding a Slate widget I think there's a widget called native hosted widget or something like that.

[fossil kayak]

oh thanks a lot!

[cobalt hare]

UNativeWidgetHost saving my life atm ty

[mild oracle]

Ah that's the name thanks :D

[mild oracle]

I never tried to use it, I'd be curious what it's like and how it helps

[fair verge]

I have problem that my old code have compile error with ue5

  MemoryOps.h(217): [C2280] 'SSplitter::FSlot::FSlotArguments::FSlotArguments(const SSplitter::FSlot::FSlotArguments &)': attempting to reference a deleted function

any tips what could have changed in the last commits of ue5 - main?

[quaint zealot]

Slots have been completely remade

Not many examples to use right now

Look in the engine source essentially

[cobalt hare]

i ended up not needing it -- i went around and around trying to figure out a way to do what i wanted 🙂
i wanted a custom drag drop operation (without the position lerping animation at the start of the drag) that i could use on otherwise normal UUserWidgets. FUMGDragDropOp is instantiated when SObjectWidget detects a drag event, so at first i tried replacing that behavior with a subclass of SObjectWidget -- but i couldn't figure out how to replace it in the UUserWidget. you are supposed to use TakeDerivedWidget for this, but the trick is that to use this you need full control of the instantiation of the UUserWidget, which, if you are building a UI in UMG, you don't.
so i went around and around trying different approaches, but ultimately i ended up creating a UUserWidget subclass that inserts an additional SObjectWidget (my subclass with a custom drag drop op) in between its root SObjectWidget and the WidgetTree that contains its actual content. all it does is listen for drag drop events that involve my custom drag drop op and forwards those to my UUserWidget. works great!

[warm vault]

Hi, is there any way to get touch position on entire screen or on UMG Element comsumes click event like Button or CheckBox?
I've tried used APlayerController::GetInputTouchState() when touch world, and UUserWidget::NativeOnTouchStarted() when touch UMGs.
But when I tried to get touch position on UButton and UCheckBox, click event was consumed in FSlateApplication::RoutePointerDownEvent().
Is there any way to get touch position on entire screen or on UMG Element comsumes click event like Button or CheckBox?

[thick pasture]

Is this in VR?

[warm vault]

@thick pasture Nope It's on Android

[hybrid wedge]

Hello, I am trying to understand how to customize details panel using Slate. I am not able to find any good reference for it. Can anyone help me with some info on it ? Thanks

[thick pasture]

I would highly recommend looking at the source for references

[low bluff]

Was there a way to get the "default" widget for a Property? I'm in the function to return a ListView Row and I would like to use the Item (TSharedPtr<Struct>) with its normal widgets for the properties (a TSoftClassPtr and an int32).

[stuck jewel]

Hmm that comes from IPropertyHandle but I don't know how to create one of those from a bare property

[low bluff]

I changed the ListView to just be based on the PropertyHandle of each of my array entries

Seems to work :D

Hm, how does one make sure that the Splitter of the row follows the other splitters ? :<

The 2 next to Count are mine :D

[stuck jewel]

Are you using detail customization or property customization?

[low bluff]

Property

I have a Struct (which I'm customizing) with an Array of Structs in it.
The inner Struct has a SoftClass and an int32 in it.

I wanted to change it so I can filter with an SSearchBox

But I fail to create an SListView based on the Array

[stuck jewel]

Usually using the separate methods to create name and value sides should work I think... are you doing that, or are you using the single customrow method?

[low bluff]

TSharedRef<ITableRow> FActorPoolDefinitionCustomization::MakeListViewWidget(TSharedPtr<IPropertyHandle> Item, const TSharedRef<STableViewBase>&O wnerTable)
{
    const TSharedPtr<IPropertyHandle> classPropertyHandle = Item->GetChildHandle("Class");
    const TSharedPtr<IPropertyHandle> countPropertyHandle = Item->GetChildHandle("Count");

    return SNew(STableRow<TSharedPtr<IPropertyHandle>>, OwnerTable)[
        SNew(SSplitter)
        .Style(FEditorStyle::Get(), "DetailsView.Splitter")
        .PhysicalSplitterHandleSize(1.0f)
        .HitDetectionSplitterHandleSize(5.0f)
        + SSplitter::Slot()
        [
            SNew(SHorizontalBox)
            + SHorizontalBox::Slot()
            [
                classPropertyHandle->CreatePropertyNameWidget()
            ]
            + SHorizontalBox::Slot()
            [
                classPropertyHandle->CreatePropertyValueWidget()
            ]
        ]
        + SSplitter::Slot()
        [
            SNew(SHorizontalBox)
            + SHorizontalBox::Slot()
            [
                countPropertyHandle->CreatePropertyNameWidget()
            ]
            + SHorizontalBox::Slot()
            [
                countPropertyHandle->CreatePropertyValueWidget()
            ]
        ]
    ];
}

I do this atm

void FActorPoolDefinitionCustomization::CustomizeChildren(TSharedRef<IPropertyHandle> PropertyHandle, IDetailChildrenBuilder& ChildBuilder, IPropertyTypeCustomizationUtils& CustomizationUtils)
{
    const TSharedPtr<IPropertyHandle> definitionsHandle = PropertyHandle->GetChildHandle("Definitions");

    BuildEntryList(definitionsHandle);

    ChildBuilder.AddCustomRow(FText::FromString("Entries"))[
        SAssignNew(EntryListView, SListView<TSharedPtr<IPropertyHandle>>)
            .OnGenerateRow(this, &FActorPoolDefinitionCustomization::MakeListViewWidget)
            .ListItemsSource(&EntryList)
            .SelectionMode(ESelectionMode::None)
    ];
}

Gotta leave office now, but will read when I'm home

[stuck jewel]

so I can see why the problem occurs... you're making your own splitter... but not entirely sure if I know a solution. you have a single struct that defines each row right? but you haven't created a property customization for that particular struct? I think you should try doing that. In the struct's property customization, build its NameWidget and ValueWidget manually (by stacking both the inner Class or Count property's Name and Value widgets inside a single SHorizontalBox for each). And then for your MakeListViewWidget, don't create your own splitter. This way your struct entry (the actual thing being displayed by your list) is a single row with a regular Name and Value widget... I think/hope this will display how you want it then

thinking more, the next problem with what I've just said is that I don't know how the MakeListViewWidget method's return TSharedRef<ITableRow> lets you define a row entry that has Name/Value widget or just draw the widget for the whole struct I thought there was a method for a property handle to just build the whole thing but can't find it right now

I wonder if you might need to dig into TArray somehow to look for clues first. I'm pretty sure what I described above would render correct if you didn't create a custom listview widget but just displayed the array (ChildBuilder->AddProperty(definitionsHandle) I think)

[low bluff]

@stuck jewel THanks for your time, I couldn't find time to read your answer up until now

I would also much prefer just having the singleproperty row

I know that's somewhat the widget

I will probably not be able to render it with one single splitter width for the whole thing, because that is handled by the SDetailsViewBase

There it has the columnWidth and that is passed into all the Splitters it creates

But I would be find if mine are shared within the widget, which should work if my details customization stores a value of how big the column is and passes that into each splitter, similar to the details view

That said, having a proper single row would be nice

[low bluff]

--
I might have found a solution

[low bluff]

Hm, nvm. Tried to just use the ChildBuilder, but I can't refresh the list like this

[low bluff]

Welp, close enough, that works for me haha

[fair verge]

I have problem that this fucntion doesn't call for me

TSharedRef<IDetailCustomization> IAUSConsiderationVisualization::MakeInstance()
{
    return MakeShareable(new IAUSConsiderationVisualization);
}

and this too

void IAUSConsiderationVisualization::CustomizeDetails(IDetailLayoutBuilder& DetailLayout)

so i wrote in my main game module this and StartupModule() calling any ideas what im missing?

#if WITH_EDITOR
#include "PropertyEditorModule.h"
#endif

#define LOCTEXT_NAMESPACE "FIAUSModule"
IMPLEMENT_PRIMARY_GAME_MODULE(FUEPrototypeModule, UEPrototype, "UEPrototype");

void FUEPrototypeModule::StartupModule()
{
#if WITH_EDITOR
    FPropertyEditorModule& PropertyModule = FModuleManager::LoadModuleChecked<FPropertyEditorModule>("PropertyEditor");
    PropertyModule.RegisterCustomClassLayout("IAUSConsiderationVisualization", FOnGetDetailCustomizationInstance::CreateStatic(&IAUSConsiderationVisualization::MakeInstance));
    PropertyModule.NotifyCustomizationModuleChanged();
#endif
}

void FUEPrototypeModule::ShutdownModule()
{    
}
#undef LOCTEXT_NAMESPACE

[limber stump]

Usually editor customization is kept in an editor module. It probably won't work in a main game module

[fair verge]

hmm thank you, ill try to change it

[split laurel]

While the above is mostly true, the issue seems to lie with the first parameter in the register function. It's supposed to be the name of the class you want to customize, not the name of the customization. A better way to do this is to use
UMyClass::StaticClass()->GetFName()

This establishes the link between class and its customization

[fair verge]

Thanks a lot for the clarification

[median pollen]

Hey there guys! I'm looking around trying to figure out how to delete items in a tile view using the delete key, how would I start?

[split laurel]

Not sure what delete key you are talking about, but generally you'd remove the item from the array the view is observing and call a refresh function on the view

[median pollen]

yeah it's actually getting the slate to do something when the delete key input is pressed that I'm not getting

[split laurel]

Ah, sorry, misunderstood the question. I was thinking of a map key..
Let me boot up my PC and see what I can find

[median pollen]

Oh I did find overriding the OnKeyDown virtual function from SWidget works haha

thank you though! I appreciate the help

[split laurel]

Haha, I was about to suggest that as I initially figured you had tried that out already

[median pollen]

nah I'm only just starting haha, thanks

[split laurel]

all good 👍

[median pollen]

so I'm using this to delete the items in my STileView

FReply STextureBrowser::OnKeyDown(const FGeometry& MyGeometry, const FKeyEvent& InKeyEvent)
{
    if (InKeyEvent.GetKey().ToString() == "Delete")
    {
        TArray<UTexture2D*> ListItemsSource = *ItemsSource;
        for (UTexture2D* ItemToDelete : this->GetSelectedItems())
        {
            ListItemsSource.Remove(ItemToDelete);
        }
        SetListItemsSource(ListItemsSource);
        RequestListRefresh();

        GEngine->AddOnScreenDebugMessage(-1, 5, FColor::Green, InKeyEvent.GetKey().ToString());
    }
    return FReply::Handled();
}
``` When I now press delete, it throws me a breakpoint

in SListView

[split laurel]

apparently the ptr is no longer valid, you'll need to check what and why, i.e., is CurItem pointing to an item you have just deleted or is it something else? The call stack would also be useful
A few things for better form:

• Instead of using GetKey().ToString() use GetKey() == EKeys::Delete
• You shouldn't need SetListItemsSourceif the source is the same as before. In fact it won't do anything if it's the same source, a refresh is enough. The list view isn't copying the array contents, just a pointer to the array. You have both an ItemsSource and a ListItemsSource so not sure what you are doing here

ah ok, I think I see the problem. Your ListItemsSource has a limited lifetime as it's destroyed when it goes out of scope, but since the list keeps a pointer to the array it points to garbage.
Make the ListItemsSource a member of your widget class instead

[median pollen]

ah right!

thank you!

@split laurel So I've added the ListItemsSource in my class and removed the SetListItemsSource

trying it now, but will it fail because it's not copying the contents of the array?

[split laurel]

your SListView will need to point to your source a single time unless you want to give it a completely different source (different address in memory)

so ideally you'll give your list view the ListItemsSource as source upon creation and then you'll only modify that array and call Refresh

[median pollen]

ah, and how would I remove an element from that source inside the widget itself?

[split laurel]

you'd do what you did before, call ListItemsSource.Remove(TextureObjectPtr);
then call View->Refresh()

the only difference being that your ListItemsSource no longer gets destroyed

[median pollen]

hmm, no more error, but the texture isn't deleting when I hit delete

[split laurel]

set a breakpoint to check if the array is being properly modified etc.

[median pollen]

I think ListItemsSource is beeing modified, but not ItemsSource

[split laurel]

yeah you need to modify the source that your view is using. Can you show me where you instantiate the view? (the SNew part)

[median pollen]

            + SWidgetSwitcher::Slot()
                [
                    SAssignNew(PaletteTileWidget, SPaletteBrowser)
                    .SelectionMode(ESelectionMode::Single)
                    .ListItemsSource(&PaletteTextureItems)
                    .OnGenerateTile(this, &SLiveryEditorToolView::OnGeneratePaletteTextureTile)
                    .OnSelectionChanged(this, &SLiveryEditorToolView::OnPaletteTextureSelectionChanged)
                ]
``` this is in another compound widget

[split laurel]

that's fine
but yeah so this is pointing to PaletteTextureItems which is now your ItemsSource within the widget

so simply modify ItemsSource itself I guess?

[median pollen]

unfortunately, I can't remove from ItemsSource

the reason why I did the whole ListItemsSource thing

[split laurel]

ah yeah, it's const. Do you know how delegates work?

as in, how you create them yourself and make use of them

[median pollen]

I do, that was my plan B

[split laurel]

then I'd do that, it's the cleanest route. There are a couple ways you could do it from within the widget but none of them are pretty

[median pollen]

I was hoping to keep it all in this class for now, but I guess it's unavoidable

thanks for the help and your time

[split laurel]

if you are 100% confident the only use case you'd ever want here is one specific thing (widgets are made to be reusable) you can also use a const cast

to get rid of the const

but I don't recommend it, it's unclean code

[median pollen]

yeah, I'll just use delegates, it's a little safer

[split laurel]

👍 I'm thinking of something like a "OnDeleteSelection"

[median pollen]

or "OnDeleteKeyPressed", since it's not doing anything

[split laurel]

yeah, or that, it really depends on how configurable vs. intentional you want to make this

with OnDeleteKeyPressed you are implying an inherent link to the delete key, but maybe you'll want another action within the widget to do the same (i.e. a "Remove Selected" button) later on. Just something to keep in mind

[median pollen]

ah yeah, good point

[fair verge]

sorry for getting back on topic, but i still have this problem. I moved PropertyModule initialisation from main game module to separate module. Also changed first param

void FIAUSModule::StartupModule()
{
#if WITH_EDITOR
    FPropertyEditorModule& PropertyModule = FModuleManager::LoadModuleChecked<FPropertyEditorModule>("PropertyEditor");
    PropertyModule.RegisterCustomClassLayout(UIAUSBaseConsideration::StaticClass()->GetFName(), FOnGetDetailCustomizationInstance::CreateStatic(&IAUSConsiderationVisualization::MakeInstance));
    PropertyModule.NotifyCustomizationModuleChanged();
#endif
}

[limber stump]

You shouldn't need the with editor stuff if its in an editor module. In your uproject/uplugin file is the new module set to editor type?

[fair verge]

you right? but its doesn't matter, this StartupModule() function calling and function inside it, but &IAUSConsiderationVisualization::MakeInstance not

[limber stump]

right, but is the module configured as a "Editor" module?
something like:

{
    "Name": "IAUSModule",
    "Type": "Editor",
    "LoadingPhase": "PreDefault"
},

[fair verge]

As Editor

[delicate marsh]

if I have a FSlateTexture2DRHIRef or similar... how can I get a UTexture2D to render in a widget? 🥲
I am going insane trying to convert this 🥲

[split laurel]

are you showing any objects of type UIAUSBaseConsideration in the details panel or only subclasses thereof?
I believe customizations don't apply to subclasses but only the specified class

just making sure here, but MakeInstance is only called when a details panel is actually shown. So it won't be called at startup. You have to select an object of the type in the details panel first.

[fair verge]

this is my class organisation and i want expand UECSIAUSResponseCurve to draw my curves in inspector.

Also MakeInstance didn't call if i choose curve type there

IAUSConsiderationVisualization has TSharedPtr<class IAUSCurvePreviewWidget> PreviewWidget; where IAUSCurvePreviewWidget has TWeakObjectPtr<class UECSIAUSResponseCurve> ResponseCurve;

[limber stump]

Your linear curve class won't inherit the customization of its parent is what Herr edgy is saying. Your linear curve class needs to also be added to your editor module with the customization and the polynomial as well

Each class you want to customize needs to be added individually

If you have reusable customizations that makes this needlessly repetitive then you can put those properties in a struct and customize the struct instead, so that any class with that property will get the customization

[fair verge]

thanks a lot for clarification and the explanation

[shrewd wedge]

Hey. I am looking for OnFocused event on a button. It seems there is none. The slate class SButton for some reason does not even override this callback. Any reason why?
Preferably without changing the engine I would like to fix this.
My first idea was to just inherit SButton but it does not seem to be that simple as there are multiple macros and the constructor is just confusing me.
We have a internal version of Button so I can easily change which slate class it creates.

[craggy holly]

What about:
virtual FReply OnFocusReceived(const FGeometry& MyGeometry, const FFocusEvent& InFocusEvent);

Part of SWidget

[shrewd wedge]

Yes. I know. But I would either have to change the engine implementation of SButton or create a "mirror class" of SButton 😦

[quaint zealot]

Example of a SButton child class here if you want to clear up the syntax: https://github.com/arbonagw/AstralShipwright/blob/master/Source/AstralShipwright/UI/Widget/NovaButton.h

rename the url for the .cpp

[shrewd wedge]

Thank you so much for that. Finally a working exampe. I could not find anything no matter the google query 🙏

[modest minnow]

I'll say upfront that I'm probably overlooking something incredibly stupid, but I'm trying to get a HorizontalBox with 2 columns where the first column expands until it reaches a maximum size and the 2nd column expands to fill the rest of the available width.

If I do this, it kinda works but stops filling at 2 x my limit:

TSharedRef<SHorizontalBox> Preview = SNew(SHorizontalBox)
        + SHorizontalBox::Slot()
        .FillWidth(1.0f)
        .MaxWidth(400.0f)
        .Padding(0.0f, 0.0f, 2.0f, 0.0f)
        .VAlign(VAlign_Top)
        [ PreviewThumbnail ]
        + SHorizontalBox::Slot()
        .FillWidth(1.0f)
        .Padding(0.0f)
        .VAlign(VAlign_Top)
        [ PreviewData ];

[stuck jewel]

have you tried dumping .AutoWidth() in either side? (and remove FillWidth)

[modest minnow]

yeh tried that first

I simplified my example and added some pictures to help explain my issue

TSharedRef<SHorizontalBox> Preview = SNew(SHorizontalBox)
        + SHorizontalBox::Slot()
        .FillWidth(1.0f)
        .MaxWidth(400.0f)
        [ SNew(SImage).ColorAndOpacity(FLinearColor::Red) ]
        + SHorizontalBox::Slot()
        .FillWidth(1.0)
        [ SNew(SImage).ColorAndOpacity(FLinearColor::Blue) ];

the above 2 are examples of it working as I want for sizes under 800, here's what happens over 800

[modest minnow]

    TSharedRef<SHorizontalBox> Preview = SNew(SHorizontalBox)
        + SHorizontalBox::Slot()
        .MaxWidth(400.0f)
        [ SNew(SImage).ColorAndOpacity(FLinearColor::Red) ]
        + SHorizontalBox::Slot()
        .AutoWidth()
        [ SNew(SImage).ColorAndOpacity(FLinearColor::Blue) ];

TSharedRef<SHorizontalBox> Preview = SNew(SHorizontalBox)
        + SHorizontalBox::Slot()
        .AutoWidth()
        .MaxWidth(400.0f)
        [ SNew(SImage).ColorAndOpacity(FLinearColor::Red) ]
        + SHorizontalBox::Slot()
        [ SNew(SImage).ColorAndOpacity(FLinearColor::Blue) ];

TSharedRef<SHorizontalBox> Preview = SNew(SHorizontalBox)
        + SHorizontalBox::Slot()
        .AutoWidth()
        .MaxWidth(400.0f)
        [ SNew(SImage).ColorAndOpacity(FLinearColor::Red) ]
        + SHorizontalBox::Slot()
        .AutoWidth()
        [ SNew(SImage).ColorAndOpacity(FLinearColor::Blue) ];

[stuck jewel]

lol i love slate

[modest minnow]

My goal is for Column A to be (200 - 400) and Column B to fill the rest

[modest minnow]

I was told it is awesome

This is the easiest thing in the world to do in every other UI so I'm either missing something simple or Slate is worse than I thought

[stuck jewel]

oh did you play with the alignment settings too already? .HAlign(fill) or whatever it is?

[modest minnow]

yeh btw that is the default value for that prop

[modest minnow]

also I should say I'm willing to use whatever widgets get me to my goal, this doesn't need to use SHorizontalBox

In some other UI toolkits you can make a grid that allows you to set min/max widths for columns or allow you to set them to fill; something like that would work awesome for me. All I saw was uniform grids and dynamic grids that allow you to weight columns (but not just some columns)

ie

Columns[0].MinWidth = 200.0f;
Columns[0].MaxWidth = 400.0f;

Columns[1].Fill = true;

[stuck jewel]

yeah this does seem to be an oversight, i feel like i've made this for UMG though...

[modest minnow]

I could only get it to do the same stuff, was using UMG to test ideas

[modest minnow]

So after looking at ArrangeChildrenAlong in SBoxPanel.cpp it will never work the way I want because children are tracked as either "fixed" or "stretched". If a child is stretched, it needs a non-zero stretch coefficient. That means I'll never be able make it weight 50/50 until max for column A and then just fill with column B

Guess I'm going to need to make my own classes that override this and behaves the way I think they should already, shouldn't be much to change in this function

[modest minnow]

what you can do without modifying (and it's easy) is a fixed size with a fill; that might be what you were thinking of

[stuck jewel]

yeah i think so too

[modest minnow]

really thinking of just making the grid style I like and giving it out as a plugin

[modest minnow]

@stuck jewel Success on my immediate needs btw. Just needed to change the behavior from around SBoxPanel.cpp:125.

Here's the engine version:

// Clamp to the max size if it was specified
float MaxSize = CurChild.MaxSize.Get();
if (MaxSize > 0)
{
    ChildSize = FMath::Min(MaxSize, ChildSize);
}

Here's my version:

// Clamp to the max size if it was specified
float MaxSize = CurChild.MaxSize.Get();
if (MaxSize > 0)
{
    if(MaxSize < ChildSize)
    {
        if (CurChild.SizeParam.SizeRule == FSizeParam::SizeRule_Stretch)
        {
            NonFixedSpace -= MaxSize;
            StretchCoefficientTotal -= CurChild.SizeParam.Value.Get();
        }
        else
        {
            NonFixedSpace += ChildSize - MaxSize;
        }

        ChildSize = MaxSize;
    }
}

I'm using it with these parameters:

TSharedRef<SHBox> Preview = SNew(SHBox)
        + SHorizontalBox::Slot()
        .FillWidth(1.0f)
        .MaxWidth(400.0f)
        [ SNew(SImage).ColorAndOpacity(FLinearColor::Red) ]
        + SHorizontalBox::Slot()
        .FillWidth(1.0f)
        [ SNew(SImage).ColorAndOpacity(FLinearColor::Blue) ];

[astral berry]

Why are you making this with slate?
Are you making an editor UI element?

[modest minnow]

I am using slate because I need to and yes I am making an Editor UI element

specifically I am making an Import dialog

I just didn't like how SHorizontalBox was laying out children when some have a max size

anyway I don't know why I forgot about making gifs earlier, but here is what SHorizontalBox does with the exact same parameters

[stuck jewel]

Lol congrats

[modest minnow]

do you think that's intended behavior or a bug?

even if it is a bug I doubt they'd wanna change this class' behavior

[astral berry]

I don't think it's intended, but at the same time I don't think they care very much. XD
You can fix the engine, and make a pull request.

[ocean mason]

Have you tried wrapping that SHorizontalBox in an SBox and set its WidthOverride to 400?

[modest minnow]

no because that doesn't even describe what I'm trying to achieve

what I just posted above does exactly what I want

[ocean mason]

ok

[modest minnow]

well I'm just saying that doesn't even make any sense based on what I described

[ocean mason]

don't worry about it, got confused of all those 5-6 code segments that do nothing :))

[modest minnow]

well none of them do nothing and the only reason there are so many is because I was posting things I knew didn't work that hojo asked me to try

[modest minnow]

yeah I know I can make a pull request. as you can see I've already found and fixed the issue on my end. My question was about whether or not I should bother.

have you filed any pull requests before? what is your experience with dealing with Epic in this regard?

[astral berry]

They responded very fast (in one day) after a pull requrest.
Regardless of the result, your name will be placed on the UE editor credits(Community Developerers Section).

[modest minnow]

Regardless of the result, your name will be placed on the UE editor credits(Community Developerers Section).
Yeh honestly that's more of a reason to avoid doing so for me. I just want things working, I don't want to be credited or associated

[analog cradle]

FSlateDrawElement::MakeBox
How do i disable hittest when manually draw Slate?

[craggy holly]

Depends on the visibility of the widget doing the drawing

The hitbox itself is always rectangular, based on the geometry of the widget.

[keen owl]

Is there a function I've missed like MakeCircle or am I best off just drawing a spline?

[sweet steppe]

im trying to use loading screens in 4.26 and i get this slate crash
ue4 Assertion failed: IsInGameThread() || IsInSlateThread() || IsInAsyncLoadingThread() [File:Runtime\Slate\Public\Framework/Application/SlateApplication.h] [Line: 225]
what might i need to look into here?

[craggy holly]

You'll need to look at the full callstack

[stiff scaffold]

Hi all, I'm new to Mac dev with Unreal and having a weird problem with my slate UI. When I click down on a button, then release, the cursor jumps to the same spot on the screen (upper right corner for some, lower left of center for others). This does not happen with my UMG UIs, just the slate ones. It does not happen in windows. It seems to not happen if I step through the code (I think because the editor looses focus), it happens in the editor, standalone, and in packaged game on the Mac. Any ideas on where to start troubleshooting this?

[stiff scaffold]

Also, I'm on 4.25.4 Big Sur

[merry notch]

Hey guys! I got a question for you. We're trying to run a simulation in one window and show a little log in an SWindow. However, if we click on the Swindow to interact with it at all, it freezes the original application. Is there any way to have both run at the same time? Or disable the freeze on the original window?

[desert oxide]

is slate better than UMG?

[limber stump]

Umg is slate. It's just a object oriented wrapper around slate widgets to expose it to the editor. Therefor slate can do anything umg can do and more. In that way it's better I guess. But you also have to deal with using slate, which is a spine rending pit of madness half the time and incomprehensibly obtuse at its best. That's not to say I don't like it. I do, but I gotta be realistic that it's one of the least untuitive parts of unreal.
My advice, and most people's, is to use umg if you can and use slate if you must. That means that if you really need to add some core underlying functionality to your UI, then slate might be your only option. But 99% of the time there is no need. Save the frustration for that 1%.

[desert oxide]

thats unfortunate

I was hoping to find an alternative to UMG

I find components like Spacer that has a fill button not filling to be very frustrating

then asking around in several places and nobody knows how to resolve

[limber stump]

Well all I can say is that spacers are mostly redundant and serve the same purpose as adding padding to the slot. I never use them. You are probably trying to use it to solve something that it's not meant for

[desert oxide]

indeed

all I wanna do is pop a close button on the top of this form

[limber stump]

Where do you want the button to be?

Above the other buttons or in the corner?

[desert oxide]

thanks for your insight @limber stump

I was pulling my hair out

chats with you and a few othesr helped point me in the right direction

I appreciate the tip about UI frameworks too

will look into that

as for your Q ... corner

as I didn't wanna waste space and bring everything down a bit

[limber stump]

Noice. Slate is fun to play with eventually once your are already fluent in Umg and know how to expose slate widgets to it. Additionally, if you ever get into making editor ui, it's all written in slate, which is why I know how to write it, so then it's a required skill to have. But for gameplay ui it's usually not needed.

[desert oxide]

getting there

that 1st one ... will lead to a help page

or I could make it invisible just to keep things aligned

that size box is handy

[sacred venture]

How do i properly close a popup window?

    TSharedRef<SWindow> Window = SNew(SWindow)
        .IsPopupWindow(true);

    FSlateApplication::Get().AddWindow(Window);

It closes when out of focus, but still receives clicks

[mild oracle]

Are there no examples in the engine?

[sacred venture]

There are some, but i cant figure out what i'm doing wrong
Also most use Modals which I don't want

[sacred venture]

used PushMenu instead of AddWindow and now its working perfectly

[split laurel]

I'm not sure about internals but I'd suspect adding a window opposed to a menu will mean you need to manually destroy it. You can call something like Window->RequestDestroy() to manually get rid of them. For anyone interested

[mental drift]

howdy - what is the correct way to remove SWidgets from containers and destroy them? I have myself SVerticalBox where I put my own widget inheriting from SCompoundWidget and I don't know how to remove them. I see DeleteSlot in the VBox, but that requires me to have TSharedRef to the widget i want to remove, which I don't have since they are added dynamically and can be a lot of them. Is there something like UMG's RemoveFromParent?

[verbal flume]

Need to make a cursor that inverts its color and the inverted colors are based on the widget(s) below it. Any tips?

[warm vault]

Hey, I was wondering if there was such thing as a unreal engine 5 theme for unreal engine 4, to make UE4 look like UE5.

[grave parcel]

Hey, I was wondering if there is a way to know the size of a Slate widget that is inside a ScaleBox. If the widget is inside a CanvasPanel I can just check the slot size for the widget, but I don't know how to check for the size if it's inside a ScaleBox

[fair verge]

There is UdataAsset. Here are classes within classes, etc. I want to write a custom option mapping for a selected class inside a UdataAsset like in the screenshot.
I wrote in the module registration for a specific class UIAUSLinearCurve

PropertyModule.RegisterCustomClassLayout(UIAUSLinearCurve::StaticClass()->GetFName(), FOnGetDetailCustomizationInstance::CreateStatic(&FIAUSSonsiderationVisualization::MakeInstance));

But methods
FIAUSConsiderationVisualization::MakeInstance() and
CustomizeDetails(IDetailLayoutBuilder& DetailLayout) are not called.

They are called if I write a registration for the UdataAsset itself
PropertyModule.RegisterCustomClassLayout(UdataAsset::StaticClass()->GetFName(), FOnGetDetailCustomizationInstance::CreateStatic(&FIAUSConsiderationVisualization::MakeInstance));

and even if i do this way how to get to the data inside such a hierarchy

[tidal mango]

hello, is there any built-in SWidget for something like "actor list box" to which actors from a level can be drag and drooped?

[raven tulip]

how do people here understand the slate syntax 😅 What is the brackets [] equivalent in C++ syntax, are these operators overload?

[quaint zealot]

It's all operator overloading

[] is generally a slot, usually the default slot

X->AddSlot() / X->SetContent() may work

[raven tulip]

Oh I see thanks, is there some sort of visual studio extension that format/lint slate syntax? Having trouble finding something similar