How to listen resize event of Stage in JavaFX?

问题:

I want to perform some functionality on resize event of form (or Scene or Stage whatever it is).

But how can I detect resize event of form in JavaFX?

回答1:

You can listen to the changes of the widthProperty and the heightProperty of the Stage:

stage.widthProperty().addListener((obs, oldVal, newVal) -> {
     // Do whatever you want
});

stage.heightProperty().addListener((obs, oldVal, newVal) -> {
     // Do whatever you want
});

---

Note: To listen to both width and height changes, the same listener can be used really simply:

ChangeListener<Number> stageSizeListener = (observable, oldValue, newValue) ->
    System.out.println("Height: " + stage.getHeight() + " Width: " + stage.getWidth());

stage.widthProperty().addListener(stageSizeListener);
stage.heightProperty().addListener(stageSizeListener); 

回答2:

Keeping a fixed width to height ratio:

stage.minHeightProperty().bind(stage.widthProperty().multiply(0.5));
stage.maxHeightProperty().bind(stage.widthProperty().multiply(0.5));