JSplitPane components interacting?

Question

Hiyas,
In my application, I'm using a JSplitPane who's 2 components are custom widgets extending JComponent. One of these widgets draws stuff, the other one has buttons of things to draw. I'm having a difficult time, however, trying to figure out how I can get the two components to talk to each other....
For example, in ButtonPane (the custom widget with the buttons), I implement ActionListener and get ActionPerformed events for when the buttons are pressed. When a button is pressed, I want to be able to draw various shapes (like MS Paint) in the DrawingPane (the other custom widget). I tried passing the DrawingPane to the ButtonPane in the main class (which extends JFrame) constructor, but that didn't work... I lost keyboard focus the moment I clicked a button. Other than that, I have no idea what else to try.
Anyone got other suggestions? :)

Answer 1

Here's what you should do.
In your panel's mouseDragged or mouseMoved event handler, add:
x = this.getLocation().x;
y = this.getLocation().y;
maxX = this.getLocation().x+this.getSize().width;
maxY = this.getLocation().y+this.getSize().height;
scrollminX = ScrollPane.getViewPort().getViewPosition().x
scrollminY = ... getViewPosition().y
scrollmaxX = scrollminX + ScrollPane.getViewPort().getExtentSize().width;
scrollmaxY = scrollminY + ... getExtentSize().height
now test to see if everything is in range