private void onSceneChanged(Scene oldScene, Scene newScene) {
Window oldWindow = null;
Window newWindow = null;
Node oldFocusOwner = null;
Node newFocusOwner = null;
if (oldScene != null) {
oldWindow = oldScene.windowProperty().get();
oldScene.windowProperty().removeListener(windowObserver);
oldFocusOwner = oldScene.focusOwnerProperty().get();
oldScene.focusOwnerProperty().removeListener(focusOwnerObserver);
}
if (newScene != null) {
newWindow = newScene.windowProperty().get();
newScene.windowProperty().addListener(windowObserver);
newFocusOwner = newScene.focusOwnerProperty().get();
newScene.focusOwnerProperty().addListener(focusOwnerObserver);
}
onWindowChanged(oldWindow, newWindow);
onFocusOwnerChanged(oldFocusOwner, newFocusOwner);
}
