Does not respect user theme #9

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1. vimpostor commented on Apr 17, 2025

   

   vimpostor

   on Apr 17, 2025

   Last edited by vimpostor

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   Yeah the dark mode support in Qt is a mess. It used to work with runtime theme changes, but now I can reproduce it only using the system theme on start (as long as you use the correct platformtheme plugin), but not changing it during runtime anymore.

   This diff seems to fix the problem, but I prefer to fix it upstream in Qt instead:

   diff --git a/src/qml/Main.qml b/src/qml/Main.qml
   index fbc3560..995f4cc 100644
   --- a/src/qml/Main.qml
   +++ b/src/qml/Main.qml
   @@ -11,7 +11,7 @@ ApplicationWindow {
    	title: Stdin.closed ? "Blobdrop" : "Reading from stdin..."
    	width: Settings.iconOnly ? Settings.thumbnailSize + 16 : 400
    	height: Math.max(48, Math.min(800, pathView.count ? pathView.contentHeight + 2 * pathView.anchors.topMargin : 350))
   -	Material.theme: Material.System
   +	Material.theme: Application.styleHints.colorScheme === Qt.ColorScheme.Dark ? Material.Dark : Material.Light
    	Material.primary: Material.Green
    	Material.accent: Material.Pink
    	Component.onCompleted: {

   It doesn't help, that Qt has implemented system theme detection in 4 different places, with all basically the same duplicated code:

   • qgtk3portalinterface
   • xdgdesktopportaltheme
   • qdbuslistener
   • qgnometheme

   This kind of shit almost makes GTK look sane in comparison. All of the above four should be unified in one single interface, that's reused everywhere. So this probably needs some refactoring first.

   Edit: Upstream issue is here: https://bugreports.qt.io/browse/QTBUG-116197 and also similarly here https://bugreports.qt.io/browse/QTBUG-133044

   👍React with 👍1Reacted by littleblack111
2. Aneeqasif commented on Sep 20, 2026

   

   Aneeqasif

   on Sep 20, 2026

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   any updates on this?
3. vimpostor commented on Sep 20, 2026

   

   vimpostor

   on Sep 20, 2026

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   any updates on this?

   For now you can use export QT_QPA_PLATFORMTHEME=xdgdesktopportal to force the platform theme, where I implemented support over 4 years ago.