JavaFX : ChangeListener to get the resolution of screen on mouse released - javafx

Question

How do I get the resolution of the screen application (during resize) but only once the mouse has been released ?
I've looked around, but I found nothing. I've done this :
scene.widthProperty().addListener(new ChangeListener<Number>() {
#Override
public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
ConfigBusiness.getInstance().setScreenWidth(newValue.intValue());
}
});
scene.heightProperty().addListener(new ChangeListener<Number>() {
#Override
public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
ConfigBusiness.getInstance().setScreenHeight(newValue.intValue());
}
});
But as you expect, everytime the width / height changes, it calls the function to save the value (in my case, in the registry, which results in many calls).
Is there a way to get the value only when the mouse button has been released ? Or maybe use another kind of listener (setOnMouseDragRelease or something like that) ?
EDIT : I want the user to be able to resize the application window, and once he releases the mouse button after resizing I would like to trigger an event (and not during the whole resizing process).
Thanks
EDIT 2 : Following a bit the idea of #Tomas Bisciak, I came up with this idea.
scene.widthProperty().addListener(new ChangeListener<Number>() {
#Override
public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
if(!widthHasChanged()){
setWidthChanged(true);
System.out.println("Width changed");
}
}
});
scene.heightProperty().addListener(new ChangeListener<Number>() {
#Override
public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
if(!heightHasChanged()){
setHeightChanged(true);
System.out.println("Height changed");
}
}
});
scene.addEventFilter(MouseEvent.MOUSE_RELEASED, new EventHandler<MouseEvent>() {
#Override
public void handle(MouseEvent event) {
if(widthHasChanged()){
ConfigBusiness.getInstance().setScreenWidth(scene.getWidth());
System.out.println("Width changed > release");
setWidthChanged(false);
}
if(heightHasChanged()){
ConfigBusiness.getInstance().setScreenHeight(scene.getHeight());
System.out.println("Height changed > release");
setHeightChanged(false);
}
}
});
I flagged the changes done during the resizing process (with the help of widthProperty and heightProperty) and set them to true if changed, and then when releasing the mouse, I set the values if they have changed.
The problem is that the last event MOUSE_RELEASED is not triggered. I see the output from the changeListeners but not the eventFilter. Any ideas ?

Answer 1

Hook listener onto scene Handle mouse event anywhere with JavaFX (use MouseEvent.MOUSE_RELEASED) and on mouse release write values of the setScreenHeight/width(on every mouse release ),
if you want to only write values when drag happened with intention of resize , use boolean flag in change() "flag=true on change" methods to indicate that change has started, aferwards on mouse release just write values wherever you want and set flag to (flag=false).

Answer 2

If you want every time the mouse is released to get the resolution of the Monitor Screen here is the code:
Assuming you have the code for the Stage and Scene you can add a Listener for MouseReleased Event like this:
public double screenWidth ;
public double screenHeight;
.......
scene.setOnMouseReleased(m->{
screenWidth = Screen.getPrimary().getBounds().getWidth();
screenHeight = Screen.getPrimary().getBounds().getHeight();
});
......
In case you have an undecorated window that you resize it manually
when the mouse is dragged i recommend you using setOnMouseDragged();
Assuming that you are doing the above this code for moving the window
manually can be useful:
public int initialX;
public int initialY;
public double screenWidth = Screen.getPrimary().getBounds().getWidth() ;
public double screenHeight = Screen.getPrimary().getBounds().getHeight();
setOnMousePressed(m -> {
if (m.getButton() == MouseButton.PRIMARY) {
if (m.getClickCount() == 1) { // one Click
setCursor(Cursor.MOVE);
if (window.getWidth() < screenWidth ) {
initialX = (int) (window.getX() - m.getScreenX());
initialY = (int) (window.getY() - m.getScreenY());
} else
setFullScreen(false);
} else if (m.getClickCount() == 2) // two clicks
setFullScreen(true);
}
});
setOnMouseDragged(m -> {
if (window.getWidth() < screenWidth && m.getButton() == MouseButton.PRIMARY) {
window.setX(m.getScreenX() + initialX);
window.setY(m.getScreenY() + initialY);
}
});
setOnMouseReleased(m -> setCursor(Cursor.DEFAULT));

Answer 3

I finally found a way to accomplish "more or less" what I wanted. Here is the code for those who are looking for how to do it.
ChangeListener<Number> resizeListener = new ChangeListener<Number>() {
Timer timer = null; // used to schedule the saving task
final long delay = 200; // the delay between 2 changes
TimerTask task = null; // the task : saves resolution values
#Override
public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
// cancels the old task as a new one has been queried
// at every change, we cancel the old task and start a new one
if(task != null) task.cancel();
// reset of the timer
if(timer == null) timer = new Timer();
task = new TimerTask() {
#Override
public void run() {
ConfigBusiness.getInstance().setScreenWidth(scene.getWidth());
ConfigBusiness.getInstance().setScreenHeight(scene.getHeight());
// stopping the timer once values are set
timer.cancel();
timer = null;
// stopping the task once values are set
task.cancel();
task = null;
}
};
timer.schedule(task, delay);
}
};
scene.widthProperty().addListener(resizeListener);
scene.heightProperty().addListener(resizeListener);
I added some comments just to help understanding the way it works. During resizing, a timer schedules a task to retrieve the width / height of the window and is started.
If another changes incomes, then the task is "reset" in order to get only the last values set.
Once the values are retrieved, it is important to clear the timer and the task, else threads will continue running.
Thanks to all who gave me hints on how to do it, hope this helps !