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.
1)
https://stackoverflow.com/questions/39048894/how-to-detect-switch-between-macos-default-dark-mode-using-swift-3
--
Zoë Peterson
Scooter Software
On 8/30/2020 11:43 AM, Alexey Tor. via lazarus wrote:
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
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