Mouse input/output events

Hello

I have a question about mouse input/output events. Specifically, I would like to know why so many mouse entry/exit events are generated. Suppose that you stack several components like this:

@Override
public void start(Stage frame) throws Exception {
     Pane root = new Pane();
     frame.setScene(new Scene(root));
     addEnterExitHandlers(root, "root");

     Pane fst = new Pane();
     root.getChildren().add(fst);
     addEnterExitHandlers(fst, "first");

     Pane snd = new Pane();
     fst.getChildren().add(snd);
     addEnterExitHandlers(snd, "second");

     Rectangle rect = new Rectangle(0, 0, 100, 100);
     snd.getChildren().add(rect);
     addEnterExitHandlers(rect, "rect");

     frame.show();
}

The addEnterExitHandlers() method just registers handlers for MouseEvent.MOUSE_ENTERED_TARGET and MouseEvent.MOUSE_EXITED_TARGET which print the name of the type of the event with the specified string.

The result looks like this:

root MOUSE_ENTERED

first MOUSE_ENTERED
root MOUSE_ENTERED_TARGET

second MOUSE_ENTERED
first MOUSE_ENTERED_TARGET
root MOUSE_ENTERED_TARGET

rect MOUSE_ENTERED
second MOUSE_ENTERED_TARGET
first MOUSE_ENTERED_TARGET
root MOUSE_ENTERED_TARGET

root MOUSE_EXITED

first MOUSE_EXITED
root MOUSE_EXITED_TARGET

second MOUSE_EXITED
first MOUSE_EXITED_TARGET
root MOUSE_EXITED_TARGET

rect MOUSE_EXITED
second MOUSE_EXITED_TARGET
first MOUSE_EXITED_TARGET
root MOUSE_EXITED_TARGET

This output is not correct, because I inserted blank lines to visually group related items.

As you can see, a MOUSE_ENTERED event is fired for each node and all nodes parents receive MOUSE_ENTER_TARGET events. I just thought that it would be sufficient to take only the last group of input/output events, respectively, that is to say:

rect MOUSE_ENTERED
second MOUSE_ENTERED_TARGET
first MOUSE_ENTERED_TARGET
root MOUSE_ENTERED_TARGET

rect MOUSE_EXITED
second MOUSE_EXITED_TARGET
first MOUSE_EXITED_TARGET
root MOUSE_EXITED_TARGET

Is there a particular reason the behavior?

Best regards
Matthias

Hi Matthias,

Yes, there is a reason for that. In the vast majority of use cases, entry/out handlers are added on a node to handle the case where the mouse arrives / leaves the node. _TARGET variants will tell you "this node or some of his children was input/out", which is not quite there. Now, if you want to check that TSF has been entered, you just do:

fst.setOnMouseEntered(new EventHandler() {
  @Override public void handle(MouseEvent e) {
    // your code
  }
});

If we have generated only the last group of events, as you suggest, you'd have to do:

fst.addEventHandler(MouseEvent.MOUSE_ENTERED_TARGET, new EventHandler() {
  @Override public void handle(MouseEvent e) {
    if (e.getTarget() == fst) {
      // your code
    }
  }
});

Even if we added convenience for the _TARGET (setOnMouseEnteredTarget) variants management, having to always check the target would be pretty boring.

See you soon,.

Pavel

Tags: Java

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