Category: AWT

Priority: Medium (Low/Medium/High/Critical)

JDK version: JDK-1_0-win32-x86.exe

Platforms: Windows 95 [Version 4.00.950]
Windows NT version 3.51

Synopsis
--------

Initiate drag in a label and move out to a panel. Incorrect mouse events
are delivered to the panel.


Description
-----------

This bug occurs on Windows95 and WindowsNT.

Press the mouse inside of a label component. Then drag the mouse from
the label to the label's containing panel, and release the mouse in
the panel. This causes erroneous mouse events to be delivered.

On Motif the panel doesn't get any events because the label eats all
of the events. However, on Windows some events from the label are
delivered to the panel, but not the correct events. The behavior on
Windows should match Motif, therefore no events should be delivered
to the panel from the label.


Test Case
---------

- Compile and run label.java:

javac label.java
java label

- Drag from the label to the panel (press the mouse inside the label,
  drag to the panel, release the mouse).

  As the mouse exits the label and enters the panel, a mouse down event
  is delivered to the panel. Subsequent mouse drag events are also
  delivered to the panel, and when the mouse is released, a mouse up
  event is delivered to the panel.

  The correct behavior would be either:
    * deliver no events to the panel
    * deliver the mouse down immediately when the mouse is pressed, not
      when the mouse enters the panel

- Drag from the label, over the panel, and back into the label (press
  the mouse inside the label, drag out over the panel and back into
  the label, and then release the mouse inside the label). Now move
  the mouse around inside the panel.

  As the mouse is moved over the panel, mouse drag events are generated
  even though the mouse button is not being held down anymore. The panel
  seems confused as to the state of the mouse.


Workaround
----------

No workaround.
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X-Sun-Data-Type: default
X-Sun-Data-Description: default
X-Sun-Data-Name: label.java
X-Sun-Charset: us-ascii
X-Sun-Content-Lines: 51


import java.awt.*;

class outlinePanel extends Panel {
  public void paint(Graphics g) {
    Component components[] = getComponents();

    g.setColor(getForeground());
    for (int i=0; i<components.length; i++) {
      Point p = components[i].location();
      Dimension d = components[i].size();
      g.drawRect(p.x-1, p.y-1, d.width+1, d.height+1);
    }
  }
}

public class label extends Frame {
  public static void main(String argv[]) {
    new label();
  }

  private Label label;
  
  public label() {
    Panel panel = new outlinePanel();
    label = new Label("Label");

    add("Center", panel);
    panel.add(label);

    show();
    Dimension d = preferredSize();
    resize(d.width*2, d.height*2);
    validate();
  }

  public boolean mouseDown(Event e, int x, int y) {
    System.out.println("mouseDown " + x + " " + y);
    return true;
  }
  
  public boolean mouseUp(Event e, int x, int y) {
    System.out.println("mouseUp " + x + " " + y);
    return true;
  }
  
  public boolean mouseDrag(Event e, int x, int y) {
    System.out.println("mouseDrag " + x + " " + y);
    return true;
  }
}