Question

Ok so lets say I have 3 Jpanels – 1 parent and 2 Children

//Assume necessary imports etc

parent is something like:

public class ParentPanel extends JFrame  {
private JPanel mainPanel,controlPanel;

public ParentPanel(){
    MainPanel pp= new ParentPanel();
    controlPanel cp = new controlPanel();
}
...

Main Panel in real thing is like a 2d graphics thing but not important for the point so simplified:

public class MainPanel implements MouseMotionListener{
    public MainPanel(){
        //not important now 
    }

    public void MouseMoved(MouseEvent arg0){
        int xPos e.getX
    }
...

What i want to do is get the X pos of the mouse and pass it from main panel up to the parent and into a label for example on the sibling control panel.

Any ideas clues or pointers appreciated thanks

Answer 1

Depending on how complicated the GUI is you can pass the ParentPanel object as a parameter to the MainPanel object. In the MainPanel you have access to all the ParentPanel’s components etc.

 public class MainPanel implements MouseMotionListener{

 ParentPanel parent;

 public MainPanel(ParentPanel p){
    //not important now
    parent = p; 
 }

 public void MouseMoved(MouseEvent arg0){
    //Access to parent here.
 }

And in the ParentPanel when you create teh MainPanel:

MainPanel pp= new MainPanel(this);

This is of course a very simple solution and more complicated GUIs will not be suitable.