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Widget transparency problems. Been stuck for weeks. [message #754939]

Sat, 05 November 2011 10:37

Sean
Messages: 2
Registered: November 2011

Junior Member

Hello everyone,

I've been stuck on designing a custom irregular shaped widget with partial transparency for quite a while. I've tried a few things:

1) Shell + region. This results in a non-anti-aliased edge. The beautiful PNG file that i load up as my widget skin ends up with ugly black jagged edges.

2) 255 semi-transparent Shells + region. This results in a smooth edge. However, my program's main function is to perform screencapture. Java's robot screencapture goes through every single window.. and hence, drops the performance of my program by 30-50%.

3) Shell + gc.drawImage + SWT.NO_TRIM|SWT.NO_BACKGROUND. This results in a smooth edge, with great transparency. However.. once you alternate tab it keeps the background.. Sad

The only way so far that i've been able to update the partially transparent background is by destroying the shell and recreating it.

The only solution that is left to me at this point is to create a square widget with no partial transparency (ie: glass effects).

If anyone can point me in the right direction i will be eternally grateful. Smile

Thanks,
Sean.

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Re: Widget transparency problems. Been stuck for weeks. [message #755029 is a reply to message #754939]

Sun, 06 November 2011 22:39

Sean
Messages: 2
Registered: November 2011

Junior Member

shell.setVisible redraws the whole thing correctly.. but if i do this the widget will be flickering an awful lot.

Currently fooling around with:
System.out.println(OS.RedrawWindow(shell.handle, null, 0, OS.RDW_INVALIDATE));

and a few variations with no luck.

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