![]() ![]() Darkening Win32 or winforms controls manually is extremely hard to get right, and leveraging the work done in Windows Explorer would prevent a lot of misdirected attempts at dark theming Win32 controls.ĮVEN MORE, there's an undocumented window attribute allowing dark mode title bars ( DWMWA_USE_IMMERSIVE_DARK_MODE). Those methods are useful because when transitioning, it allows developers to use a dark theme for old controls and new controls alike, to get a somewhat consistent UI. ![]() Dark mode ribbon can be opt-in with the window property UI_PKEY_DarkModeRibbon.Note that some controls might need to have their theme manually set to DarkMode_Explorer for this to be effective.Once this method is called, the Win32 controls in the window uses dark theme if the system dark theme is enabled, and automatically switches to light theme when the user changes their settings.Once the app mode is set to AllowDark using the API above, it is a per-window opt-in.This is notably used by Windows Explorer for its dark theme. This allows apps to enable dark theme support for Win32 controls.A WinRT API should probably be exposed (the two settings and an event to listen for changes) as well, but some applications are already tentatively using those two APIs, so it would be the best case to document the Win32 APIs, as those won't have to do any significant work to adopt an official solution rather than an undocumented one (and, truth be told, they are much simpler to use than their WinRT counterparts, especially if your language doesn't have a WinRT projection available)Īlso, there exists other APIs in uxtheme.dll which might be of interest for people transitioning to WinUI and/or XAML islands: This will allow existing apps to easily implement dark theme support, and to follow system settings without relying on workarounds. Particularly useful for determining if a white or black notification area icon should be used.This allows apps to detect whether the taskbar, start menu and other system shell elements uses the dark theme or not.Changes to this can be detected by listening for WM_SETTINGCHANGE. ![]() Particularly useful to follow system settings, like Microsoft Edge and UWP-based apps do.This allows apps to detect whether the dark theme is used for apps.I strongly suggest to document those two existing methods: Currently, reliably detecting dark mode in Win32 applications requires either reading the registry or using undocumented methods from uxtheme.dll. ![]()
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