help with button in mainframe (calculator) | Together Java | Page 1

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only glanced your code, after the calc.sett.. do u update the screen value ?

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no that's not what im asking

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u do some math in the add method

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then u set calc.sett ...

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do u upate the gui after ?

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https://i.imgur.com/yPJ89Qk.png

Imgur

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that's what im asking. Are u asking it to update after that code :p

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no no need for screenshots, just try to answer the question

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u set the value in the calculator

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after that, are u telling the GUI to update or not ?

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where is the update ?

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( your code is messely ported over to the gist )

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ok il try to rephrase

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your gui had an action

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so u send stuff to the backend

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after that has been send, are u asking your GUI to update ( redraw ) ?

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ou ?

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( where )

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unless the bot really messed up the gist creation, the only text change i'm seeing is set to 0

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yea the textfield

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yes , so that the GUI reads from the backend

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u got an inital set to 0 in your code

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alot of getters from the textfield towards your backend

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but no result send to it

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A gui does not automaticly update when the backend value is changed so that code section is quite needed

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before u go off to think in weird solutions, do u understand what im asking ?

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now where does it read from the calculator ?

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u gui does not do things on its own, it needs to be instructed to do things

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can u please answere where it does that ?

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i cant see it in the code that u uploaded, and that's most likely where the problem is

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your answer is this -> the calculator reads from the textfield

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im asking the inverse

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where does the textfield gets it value out of the calculator

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right, can u post the code where it does that ?

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ty, that was not added to the initial gist

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mm it was added

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@winter heart this is the name of the textfield correct ?

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currentValueTextField

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the only value your setting to is it the initial 0

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do u have an update method where it reads from the calculator class ?

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( even the initial 0 should come from the calc. )

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that return currentvalue

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that does not instruct the textfield to change its contents

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ok lets try something else

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what normally happens is this

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enter data in gui, event happends, backend reads from gui and does its work. Then gui gets instructed to redraw / update the sections that are changed

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do u grasp that concept ?

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u got all the code that goes to the backend

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u got no code that tells the gui to update

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the only output your sending towards your textfield is the initial string 0

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no your correct

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after the backend does it work, u need to tell the frontend to do an update

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so (because u got multiple operations possible )

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u make a method called ( example) updateResult where u set the textfields contents to the result of the calculator

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and u call that method at the end of every possible operation

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yeah u can do that aswell, if u place the instrructions in each operation

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Not really a smart thing to do, cause if u need to change it, u need to change it all over the place

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why are u not reading from your calculator ?

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your mainframe class has a private Calculator calc. Also where your sending your frontend data to. So it would be logical to read data from calc. aswell ?

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right

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and did u fix your overwrite in the add method ?

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  double currentValue = calc.getCurrentValue();
        calc.add(Double.valueOf(currentValueTextField.getText()));
        calc.setCurrentValue(currentValue);

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basicly your saying, read in currentvalue, do some math, overwrite with old result

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no, but try it out

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the concept should be good, there 's a small detail u need to add after, but try to get it working first

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then worry on the user's possibly wrong input

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nice

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that depends on how u made it. IF its possible to enter wrong values, then u need to counter them

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on your screenshot i'm not seeing any 0-9 and no negative toggle so i'm assuming that's typed

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no your overthinking it

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are u typing in the numbers or are they buttons ?

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if its typing -> assume wrong input WILL happen

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so u need to counter that 😉

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do u know what a mistake would be ?

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judging from the time on the respons , not really

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what would happen if u type in a word ?

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try it

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what does it show ?

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that's not nothing lol

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that's your program chrashing

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no

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that's what i said, u got 0 input checking at the moment

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u need to add that

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else your program will fatal

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rather sure that u already have seen it

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do u know how grasp letters and such out of words ?

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all u have to do is check that the thing typed only contains valid characters

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pas grave, mais je dois aller cherge ma famme a la gare. Il faut justement verifie si le mot qui est dans le textfield est valable avec tous les possibilites dun calculatrice

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( just need to check that the text contents matched a calculator max use ) 0123456789./*-+ and whatever u need

#help with button in mainframe (calculator)