Windows 10 Dark Theme

Seb Tur

Do you see any reason why the same build on the same qtlibs would have this dark theme working on some win10 and on some win10 it is still unchanged?

l3u_

I just stumbled upon this, after successfully having adapted one of my projects to look good in dark mode on Linux/KDE and macOS. Is there anything new about this? Will Qt support Windows's dark mode, as it does on Linux and macOS without having to implement it manually?

Carl_P

@Seb-Tur I don't know exactly. I think the thing I would look at is whether the AppsUseLightTheme setting is located in HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize in the version where the dark mode is not working. This can be found in regedit.msc

Carl_P

@l3u_ I think there may be some support for dark mode in Qt 5.15 or at least it may be coming. In the QGuiApplication documentation, there are platform specific command line options, this one looks promising:

darkmode=[1|2] controls how Qt responds to the activation of the Dark Mode for applications introduced in Windows 10 1903 (since Qt 5.15).
A value of 1 causes Qt to switch the window borders to black when Dark Mode for applications is activated and no High Contrast Theme is in use. This is intended for applications that implement their own theming.

A value of 2 will in addition cause the Windows Vista style to be deactivated and switch to the Windows style using a simplified palette in dark mode. This is currently experimental pending the introduction of new style that properly adapts to dark mode.

Seb Tur

@Carl_P
not present

Carl_P

@Seb-Tur Early versions of Windows 10 did not have dark mode, if I recall correctly. I think this came with one of the later updates. If you add this field in regedit, it will work.

mguludag

@Carl_P 's solution combined with Qtimer it'll follows windows 10 mode changes immediately . Here is an example

Romain C

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jlagerquist

Using Carl_P's solution works well for my application (Win10) on everything but QWizard and QWizardPage, how do I go about setting the colors on those as well?

Ecto Ruseff

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