#Issue with bidirectional binding

1 messages · Page 1 of 1 (latest)

gusty yoke
#

Hi. I'm having an issue where my bidirectional bind is working only one way. When I change Label.styleProperty(), the data model gets updated. When updateState() is called within the model though, nothing happens, the converter isn't called. ```java
private void renderCell(final GameOfLifeCell modelCell, final PlanarCoordinates cellCoordinates) throws NoSuchMethodException {
JavaBeanBooleanProperty aliveProperty = buildAliveProperty(modelCell);
CellStateStyleConverter converter = new CellStateStyleConverter();

    Label viewCell = new Label("");
    viewCell.setMinSize(20, 20);
    viewCell.setOnMouseClicked(mouseEvent -> {
        handleCellClick(mouseEvent, cellCoordinates);
        System.out.println(aliveProperty.getValue());
    });
    viewCell.styleProperty().bindBidirectional(aliveProperty, converter);
    boardGrid.add(viewCell, cellCoordinates.width(), cellCoordinates.height());
}

private JavaBeanBooleanProperty buildAliveProperty(GameOfLifeCell modelCell) throws NoSuchMethodException {
    JavaBeanBooleanPropertyBuilder bpb = JavaBeanBooleanPropertyBuilder.create();
    return bpb
            .bean(modelCell)
            .name("value")
            .getter("isAlive")
            .setter("updateState")
            .build();
}```
cold graniteBOT
# gusty yoke Hi. I'm having an issue where my bidirectional bind is working only one way. Whe...

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Formatted code 
private void renderCell(final GameOfLifeCell modelCell, final PlanarCoordinates cellCoordinates) throws NoSuchMethodException {
  JavaBeanBooleanProperty aliveProperty = buildAliveProperty(modelCell);
  CellStateStyleConverter converter = new CellStateStyleConverter();
  Label viewCell = new Label("");
  viewCell.setMinSize(20, 20);
  viewCell.setOnMouseClicked(mouseEvent -> {
    handleCellClick(mouseEvent, cellCoordinates);
    System.out.println(aliveProperty.getValue());
  }
  );
  viewCell.styleProperty().bindBidirectional(aliveProperty, converter);
  boardGrid.add(viewCell, cellCoordinates.width(), cellCoordinates.height());
}
private JavaBeanBooleanProperty buildAliveProperty(GameOfLifeCell modelCell) throws NoSuchMethodException {
  JavaBeanBooleanPropertyBuilder bpb = JavaBeanBooleanPropertyBuilder.create();
  return bpb.bean(modelCell).name("value").getter("isAlive").setter("updateState").build();
}
#

<@&987246487241105418> please have a look, thanks.

gusty yoke
#

I checked one more thing, and it seems like JavaBeanProperty gets updated properly, but styleProperty doesnt

#

Although my deduction here might be wrong

gusty yoke
#

I debugged it more thorougly and it seems aliveProperty doesn't update correctly after all

# 
      aliveProperty.addListener((observable, oldValue, newValue) -> {
            System.out.println("Property changed: " + oldValue + " -> " + newValue);
        });``` i used this to check if the property changes when model is updated
#

and it doesnt

simple niche
#

I never had much luck with bidirectional binding tbh either. I only use binding sparingly and unidirectionally if I do. Once properties are bound, they have to be unbound if something outside wants to change them. The stuff I bind I don't intend for anyone else to change. The way I've seen "bidirectional binding" done is by using listeners to update each other. Not the cleanest way ever, but it does work.

#

I wish I had a better answer for ya, and I feel for you. If you find a solution lmk!

cold graniteBOT
#

@gusty yoke

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gusty yoke