BalloonWindow

A BalloonWindow is a floating balloon window anchor to the corner of another control. It's something like the org.eclipse.swt.widgets.ToolTip, except that it could contain any controls instead of a simple messsage, and should not have to be attached with a org.eclipse.swt.widgets.TrayItem.

This is the modified versino of the BalloonWindow widget comes from the Novocode SWT Controls. It has been modified in the following way:

• Refactor the code to make the logic more clear.
• The new BalloonWindow could moves with its parent together.
• Could set the anchor to SWT.LEFT, SWT.RIGHT, SWT.TOP, or SWT.BOTTOM.

TODO

• Add the shadow to the balloon window. (Is it possible?)

Usage

Here is the code snippet:

final Button button = new Button(shell, SWT.NONE);
button.setText("Click this button to show a balloon window.");
button.addSelectionListener(new SelectionListener() {
  @Override
  public void widgetSelected(SelectionEvent e) {
    onClick();
  }
  @Override
  public void widgetDefaultSelected(SelectionEvent e) {
    onClick();
  }
  public void onClick() {
    System.err.println("Button clicked.");
    //  we should recompute the location of the label before show the balloon
    //  window
    final BalloonWindow bw = createBalloonWindow(shell.getDisplay());
    final Point loc = button.toDisplay(button.computeSize(SWT.DEFAULT, SWT.DEFAULT));
    bw.setLocation(loc);
    bw.open();
  }
});

... 

private static BalloonWindow createBalloonWindow(Display display) {
    final int style =  SWT.ON_TOP | SWT.TITLE | SWT.CLOSE;
    final BalloonWindow bw = new BalloonWindow(display, style);
    bw.setTitleText("This is the title text");
    final Image img = SWTResourceManager.getImage(display,
        BalloonWindowExample.class, "/images/warning.png");
    bw.setTitleImage(img);

    final Label label = new Label(bw.getContents(), SWT.WRAP);
    label.setText("You can add any widgets to the contents composite of the "
        + "balloon window. You can add any widgets to the contents composite of the "
        + "balloon window. You can add any widgets to the contents composite of the "
        + "balloon window. You can add any widgets to the contents composite of the "
        + "balloon window. You can add any widgets to the contents composite of the "
        + "balloon window. ");
    label.setSize(label.computeSize(300, SWT.DEFAULT));
    label.setBackground(bw.getShell().getBackground());
    bw.getContents().setSize(label.getSize());
    bw.addSelectionControl(label);
    bw.setAnchor(SWT.TOP | SWT.LEFT);
    return bw;
}

Example

An example is located in the source repository:

src/test/java/com/github/haixing_hu/swt/window/BalloonWindowExample.java