ingrid.yao@Eng 1997-07-29

Problem reported by Oracle:

WM_ACTIVATE processing tries to set the focus to the Component that had the
focus last time the window was activated. WWindowPeer.getFocusPeer() tries to
cast a Component's peer to WComponentPeer, which causes a ClassCastException
for LW Components. The method needs to return the HW ancestor of the LW
Component:

Proposed fix:

    WComponentPeer getFocusPeer() {
        Component c = ((Window)target).getFocusOwner();
        while (c != null) {
            ComponentPeer peer = c.getPeer();
            if (peer != null && peer instanceof WComponentPeer) {
                return (WComponentPeer) peer;
            } else {
                // peerless sub-component, try parent.
                c = c.getParent();
            }
        }
        return null; // no child has focus
    }


Test case:
==========
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class b516111
       extends Applet
       implements WindowListener, FocusListener
{
    private Frame _mFrame1;
    private lwComponent _mComponent1;

    public b516111()
    {
    }

    public void start()
    {
        _mFrame1 = new Frame("Frame 1");
        _mFrame1.setBounds(100, 100, 300, 200);
        _mFrame1.setVisible(true);

        _mFrame1.addWindowListener(this);
        _mFrame1.addFocusListener(this);

        _mComponent1 = new lwComponent();
        _mFrame1.add(_mComponent1);
        _mComponent1.requestFocus();
    }

    public void windowOpened(WindowEvent e)
    {
    }

    public void windowClosing(WindowEvent e)
    {
    }

    public void windowClosed(WindowEvent e)
    {
    }

    public void windowIconified(WindowEvent e)
    {
    }

    public void windowDeiconified(WindowEvent e)
    {
    }

    public void windowActivated(WindowEvent e)
    {
    }

    public void windowDeactivated(WindowEvent e)
    {
    }

    public void focusGained(FocusEvent e)
    {
    }

    public void focusLost(FocusEvent e)
    {
    }
}

class lwComponent extends Component
{
  public lwComponent()
  {
  }
}



john.bui@eng 1997-10-17

No specific test case available. Implicity tested, closed with exposure.