Draggable App Window

[Travis]

Thought their might be some interest for this. If you have any Ideas
to make it better, please let me know. This is basically a DialogBox
with an added Image in the caption to close the window. It also draws
a border around your content. Has been tested in Firefox and IE.

Thanks
Travis

import com.google.gwt.user.client.ui.DockPanel;
import com.google.gwt.user.client.ui.FocusPanel;
import com.google.gwt.user.client.ui.HasAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.AbsolutePanel;
import com.google.gwt.user.client.ui.Widget;
import com.google.gwt.user.client.ui.ScrollPanel;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.ui.MouseListenerAdapter;

public class PopupWindow extends PopupPanel implements ClickListener{

private DockPanel inner = new DockPanel();
private DragListener dragListener = new DragListener();
private FocusPanel caption = new FocusPanel();
private Label captionText = new Label();
private HorizontalPanel n = new HorizontalPanel();
private AbsolutePanel c = new AbsolutePanel();
private ScrollPanel content = new ScrollPanel();
private Image close = new Image("winclose.gif");

public PopupWindow(String text) {
captionText.setText(text);
n.add(captionText);
n.add(close);
n.setCellHorizontalAlignment(close,HasAlignment.ALIGN_RIGHT);
n.setWidth("100%");

close.setStyleName("close");
close.addClickListener(this);

caption.setStyleName("Caption");
caption.addMouseListener(dragListener);
caption.add(n);

c.add(content);
content.setStyleName("Content");

inner.add(caption,DockPanel.NORTH);
inner.add(c,DockPanel.CENTER);
inner.setStyleName("PopBody");

add(inner);
addStyleName("PopWindow");
}

public void onClick(Widget sender){
hide();
}

public void setContentPanel(Widget widget){
content.add(widget);
show();
}

public void setText(String text){
captionText.setText(text);
}

private class DragListener extends MouseListenerAdapter {

private boolean dragging;
private int dragStartX;
private int dragStartY;

public void onMouseDown(Widget sender, int x, int y) {
dragging = true;
dragStartX = x;
DOM.setCapture(caption.getElement());
dragStartY = y;
}

public void onMouseMove(Widget sender, int x, int y) {
if(dragging){
int absX = x +sender.getAbsoluteLeft();
int absY = y +sender.getAbsoluteTop();
setPopupPosition(absX - dragStartX, absY - dragStartY);
}
}

public void onMouseUp(Widget sender, int x, int y) {
dragging = false;
DOM.releaseCapture(caption.getElement());
}

}
}

Here is the CSS:

.PopWindow{
border:1px solid black;
}
.PopBody{
background:#e6eaf6;
}
.Caption{
width:100%;
height:25px;
background:#e6eaf6;
cursor:move;
}
.Content {
width:auto;
height:100%;
background:#ffffff;
border:1px solid black;
margin-right:5px;
margin-bottom:5px;
margin-left:5px;
}
.close{
float:right;
margin-top:2px;
margin-right:2px;
cursor:pointer;
}