javafx.scene.control.Dialog won't close on pressing “x”

Question

If I just create an empty class extending from javafx.scene.control.Dialog, it won\'t close when I\'m pressing the \"x\" button in the top right corner

Answer 1

To quote the Api Docs:

JavaFX dialogs can only be closed 'abnormally' (as defined above) in two situations:

1. When the dialog only has one button, or

2. When the dialog has multiple buttons, as long as one of them meets one of the following requirements:

   1. The button has a ButtonType whose ButtonData is of type ButtonData.CANCEL_CLOSE.
   2. The button has a ButtonType whose ButtonData returns true when ButtonData.isCancelButton() is called.

   ...

So either add at least one button or multiple buttons, and one of them is of type ButtonData.CANCEL_CLOSE, for example:

Dialog dialog = new Dialog<>();
dialog.getDialogPane().getButtonTypes().add(new ButtonType("Got it!", ButtonData.CANCEL_CLOSE));
dialog.setContentText("test");
dialog.showAndWait();

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Edit:

This behavior is implemented in javafx.scene.control.FXDialog.requestPermissionToClose(Dialog), but the real FXDialog shown is HeavyweightDialog which is not public API so not really an extension point.