MouseListener on JFrame
-
05-07-2019 - |
Question
I want to be notified of mouse events (specifically the mouse entered and exited events) on my JFrame. But when i add a mouselistener to it i get the events on the borders of the frame not the entire frame with it's contents.
Any ideas as to why?
EDIT : Or at least do you have an alternative? I want a "gloabal" way to catch mouse events on the JFrame. Maybe a mouselistener is not the answer.
Solution
You can get all events and check if their source is a component in the JFrame.
OTHER TIPS
There is an invisible component that overlays the whole GUI, the "glass pane". You can attach your listeners to that. Example:
JFrame frame = new JFrame();
Component glassPane = frame.getGlassPane();
glassPane.addMouseListener(myListener);
If you want your intercepted events to pass through to the underlying components, you can redispatch them. For example:
public void mouseMoved(MouseEvent e) {
redispatchMouseEvent(e, false);
}
Because the contents ( probably a JPanel ) are "shadowing" and consuming the events and they don't reach the JFrame.
What you can do is to add the same listener to all the children. There should be a better way though.
An alternative to AWTEventListener
is to push an EventQueue
. This has the advantage that applets and WebStart application can do this.