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Old 06-03-2019, 01:35 PM   #1
Human being with feelings
Join Date: Jul 2009
Posts: 2,752
Default How to set transparency of swell window on macOS

According to what I've read on the web, this should work:
(hwnd is a top-level window with a GWL_STYLE of WS_THICKFRAME)
NSWindow* window = (NSWindow*)hwnd;
[window setAlphaValue:opacity];
[window setOpaque:NO];
However, instead of affecting the entire window, only some parts (probably some child windows) are changed, and instead of becoming transparent (i.e. showing other windows underneath) these parts fade to opaque white.
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