Eclipse Community Forums: Standard Widget Toolkit (SWT) » How to prevent resize event to pass to a child

Home » Eclipse Projects » Standard Widget Toolkit (SWT) » How to prevent resize event to pass to a child(I embed a native window and I don't want it to be resized until the user finishes resizing the Shell)

Show: Today's Messages :: Show Polls :: Message Navigator

How to prevent resize event to pass to a child [message #540182]

Tue, 15 June 2010 06:02

Marton Sigmond
Messages: 70
Registered: July 2009
Location: Hungary

Member

Hi,

I have an SWT (RCP) application.
I embed a native window into the widget hierarchy (win32):

// Remove window decoration
embedComp = new Composite(parent, SWT.EMBEDDED);
OS.SetParent(winHandle, embedComp.handle);

Since the embedded native window is heavyweight, I do not want it to be resized as the user drags the border of the SWT Shell (only when the user finally releases the mouse button).

I tried to filter the Resize events on the embedding Composite, but did not help:

display.addFilter(SWT.Resize, new Listener() {
  @Override
  public void handleEvent(final Event event) {
    if (embedComp == event.widget) {
      event.doit = false;
      event.type = SWT.None;
    }
  }
});

The native window still gets resized as the user drags the Shell border.

Please let me know if you have any suggestion.

Thanks,
Marton

Report message to a moderator

Re: How to prevent resize event to pass to a child [message #540188 is a reply to message #540182]

Tue, 15 June 2010 06:36

Vijay Raj
Messages: 600
Registered: July 2009

Senior Member

display filters work only at the SWT level ,they dont block the native events like resize...

whats the layout of your shell on which you are placing your win32 window.

one thing you can do is add a control listener on the shell and on controlresized apply the layout on the shell and do a .layout

and may be remove the layout after done.

---------------------
why, mr. Anderson, why, why do you persist?
Because I Choose To.
Regards,
Vijay

Report message to a moderator

Re: How to prevent resize event to pass to a child [message #540236 is a reply to message #540182]

Tue, 15 June 2010 09:06

Alexandra Niculai
Messages: 84
Registered: July 2009

Member

Maybe you could override the resize method on the child.

Report message to a moderator

Re: How to prevent resize event to pass to a child [message #540290 is a reply to message #540188]

Tue, 15 June 2010 10:32

Marton Sigmond
Messages: 70
Registered: July 2009
Location: Hungary

Member

Thanks for the idea, I could use it successfully.

I created a custom Layout, and a shell control listener within it.
When a resize event came in, I set a flag to forbid the layout() method to change anything:

public class MyLayout extends Layout {
	public MyLayout(final Composite composite) {
		final Shell shell = PlatformUI.getWorkbench()
				.getActiveWorkbenchWindow().getShell();
		final ControlListener ctrlListener = new ControlAdapter() {
			@Override
			public void controlResized(final ControlEvent event) {
				resizeForbidden = true;
				scheduleDoLayout(DO_LAYOUT_DELAY);
			}
		};
		shell.addControlListener(ctrlListener);
		composite.addDisposeListener(new DisposeListener() {
			@Override
			public void widgetDisposed(DisposeEvent e) {
				shell.removeControlListener(ctrlListener);
			}
		});
	}

	@Override
	protected void layout(final Composite composite, final boolean flushCache) {
		if (resizeForbidden) {
			return;
		}

When no more resize events came for 2 secs, I reset the flag, and invoke the composite's layout() method.

Thanks again!
Marton

Report message to a moderator

Previous Topic:	Canvas border blinking on resize
Next Topic:	Adding animation to Button

Goto Forum:

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

]

Current Time: Sat May 18 12:02:22 EDT 2013