win11 dark scrollbars

[SRD]

I noticed in Notepad++ which uses scintilla, that they have somehow gotten the scrollbars to be dark when the system is set to dark mode. 

Anyone know how they did that? Or where that might be located in scintilla itself?

Thanks

[Neil Hodgson]

SRD:

> Or where that might be located in scintilla itself?

Scintilla just uses standard Windows scroll bars which are drawn completely by Windows. Their presence is determined by the application specifying the scrollbar request flags when creating a "Scintilla" window: WS_VSCROLL | WS_HSCROLL.

Neil

[Stan Day]

Neil, that's interesting. I'm running the latest win11. I know this is probably outside the scope of Scintilla, but I don't know who else might know. In Notepad++ scrollbars look like the first image below (and they are part of the scintilla component), in a regular edit window, they always look like the 2nd image. I'd like to "force" the edit control's scrollbar to look like the Notepad++ scrollbar. Is there a StyleHook being called on scintilla somewhere? I was hoping there was some DWM call or something to make this work. I was able to finally get dark captionbars using new DWM calls. Hoping there was something like that for scrollbars too.

 

Dark

Light

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[marc]

You just need the HWND of your scintilla window...

SetWindowTheme(wnd, is_dark ? L"DarkMode_Explorer" : nullptr, nullptr);

[SRD]

Marc,

You can NOT believe how long I've been looking for this! Thanks! In my Delphi program I used this for dark:

SetWindowTheme( Memo1.Handle, 'DarkMode_Explorer', nil);

or this for light:

SetWindowTheme( Memo1.Handle, 'LightMode_Explorer', nil);

And that finally worked for all the components I used it on. Thanks again

Stan

[marc]

I do have a question for Neil on this. Is it possible to get the HWND of the auto complete control?

Marc

[Andrew Truckle]

If Windows apps are MFC based then they will not support dark mode. But if the Windows apps are the newer ones that work through the Microsoft Store (WinUI apps is it?) then they will support dark mode.

[Neil Hodgson]

Marc:

> Is it possible to get the HWND of the auto complete control?

Use Win32 APIs like FindWindowEx to find the HWND. The class name for the auto-complete is "ListBoxX".

Neil