Bug 567955

Summary:	In Windows, no Composite/Canvas redraw occurs inside a Shell having SWT.NO_TRIM or SWT.ON_TOP
Product:	[Eclipse Project] Platform	Reporter:	Andy Maleh <andy.am>
Component:	SWT	Assignee:	Platform-SWT-Inbox <platform-swt-inbox>
Status:	NEW ---	QA Contact:
Severity:	normal
Priority:	P3	CC:	andy.am
Version:	4.17
Target Milestone:	---
Hardware:	PC
OS:	Windows 10
Whiteboard:

Description Andy Maleh

2020-10-16 23:46:20 EDT

This issue was encountered in Windows 10 only. On Mac OS Catalina, it works just fine.

When attempting to redraw a Composite or Canvas, no redraw occurs (and the paintControl event does not fire)

Comment 1 Andy Maleh

2020-10-16 23:48:05 EDT

(In reply to Andy Maleh from comment #0)
> This issue was encountered in Windows 10 only. On Mac OS Catalina, it works
> just fine.
> 
> When attempting to redraw a Composite or Canvas, no redraw occurs (and the
> paintControl event does not fire)

Forgot to mention what is in the title. on Windows, I cannot redraw a Composite or Canvas if inside a Shell having SWT.NO_TRIM or SWT.ON_TOP only. If inside a shell with SWT.SHELL_TRIM, redraw works just fine.

Comment 2 Andy Maleh

2020-12-30 02:53:05 EST

To explain my purpose behind wanting to paint on a canvas or composite inside a no trim shell on top, I am trying to render an animated gif as an SWT application splash screen. For now, I got around the problem by rendering a shell trim around it on Windows. As a result, it doesn't look like a true splash screen on Windows, but close enough. On the Mac, it works perfectly. Thanks.