Mailing lists / lazarus / 2020-08
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This forum topic is about how we can react to macOS theme change. https://forum.lazarus.freepascal.org/index.php?topic=43111.msg376056;topicseen#new
and I had the idea to make all this task simpler.
we have the TApplicationProperties. let's add OnThemeChange there! some widgetset funcs will be needed.
now it's the problem - do this reaction on macOS, on win32,... no one knows how to do it on gtk2/qt...
I wrote to Dmitry (Cocoa developer) about this idea, then wrote here.
Alexey Torgashin
ThemeServices has an OnThemeChange callback for this already. Adding it to TApplicationProperties wouldn't be a terrible idea, though it would probably be better to implement CM_THEMECHANGED/CM_STYLECHANGED in TControl, which would be VCL compatible. I haven't tested it on most widgetsets, but I do see calls to IntfDoThemeChange in them. When I tested with Qt5 on Mint Cinnamon, there were cases where it wasn't getting called correctly, but I haven't had a chance to research it fully yet. Looks like Cocoa is just watching for the system colors to have changed; this question[1] on StackOverflow implies it'll we'll need to hook into DistributedNotificationCenter instead.