Re: [platform-swt-dev] Transparent Background Work

[Niraj Modi <niraj.modi@xxxxxxxxxx>]

Thanks Ian for trying out the Transparent
Background feature/API and sharing your feedback.
Replying to your queries in-line.

Regards,
Niraj Modi


From:      
 Ian Bull <irbull@xxxxxxxxxxxxxxxxx>
To:      
 "Eclipse Platform
SWT component developers list." <platform-swt-dev@xxxxxxxxxxx>
Date:      
 03/22/2015 12:52 AM
Subject:    
   [platform-swt-dev]
Transparent Background Work
Sent by:    
   platform-swt-dev-bounces@xxxxxxxxxxx

---

Hi everyone,

I was looking at the Transparent Background Color work
that was introduced in M5 [1] and it's pretty awesome. Having the ability
for background controls to 'bleed through' can result in some pretty nice
looking UIs and brings SWT in-line with many modern UI toolkits (most mobile
UI toolkits make use of these types of controls).

[1] https://www.eclipse.org/eclipse/news/4.5/M5/

I've put together a small image viewer (see attached)
to experiment with this

Unfortunately when I tried to render this on Windows,
the results were not nearly as good. There appears to be two limiting factors
here:

1. ScrolledComposites canot have a transparent backgrounds
>> Do you have a test snippet that doesn't
work for you. We will also try out ScrolledComposite.

2. SWT only honours extreme alpha values (0 or 255). 

Is there more work planned on this feature for Mars, or
have we hit the limits of what's possible with the Win32 API? Is there
anything I can do to help?
>> Currently no work is planned in 4.5
to support other values of alpha


Cheers,
Ian


-- 
R. Ian Bull | EclipseSource Victoria | +1 250 477 7484
http://eclipsesource.com
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