Review request for 7124236: [macosx] Some components lost shadows after the latest fix of translucent windows.

Anthony Petrov anthony.petrov at
Wed Feb 1 08:43:07 PST 2012

Hi Dmitry,

Major concern: is that possible to avoid modifications to the shared 
code with this fix?

On 1/31/2012 11:04 PM, Dmitry Cherepanov wrote:
> The cause of the problem with broken shadows is that currently 
> NSWindow's background color is [NSWindow clearColor] and it makes 
> shadows invisible. The fix implements Mike's suggestion and now we draw 
> pure transparent pixels into a CALayer so that the native background 
> color will be visible through transparent areas of the CALayer.

Looks like it should work fine if background's alpha is > 0 and < 255. 
And what about window.setBackground(new Color(0, 0, 0, 0))? I see that 
in CPlatformWindow we'll actually pass these zeros (which is in fact the 
same as the clearColor, isn't it?) to the native system. In this case I 
wouldn't expect any shadow to appear since the background color set is 
completely transparent. Is this correct?

Also, the bug evaluation mentions the click-through problem. Is it 
resolved with this fix?

best regards,

> Thanks,
> Dmitry

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