style: setup qt and gtk styles, options and defaults

modules/style/qt.nix

@@ -9,50 +9,54 @@ with lib; let
     package = pkgs.gruvbox-gtk-theme;
     name = "Gruvbox-Dark-BL";
   };
-  cfg = config.modules.theming.qt;
+  cfg = config.modules.style.qt;
   inherit (config.modules.other.system) username;
 in {
-  options.modules.theming.qt = {
-    enable = mkEnableOption "qt theming";
-    name = mkOption {
-      description = "qt theme name";
-      type = types.str;
-    };
-    variant = mkOption {
-      description = "qt theme variant";
-      type = types.str;
-    };
-    accentColour = mkOption {
-      description = "accent colour for qt theme";
-      type = types.str;
-    };
-    package = mkOption {
-      description = "qt theme package";
-      type = types.package;
-    };
-  };
-
   config = mkIf cfg.enable {
     environment.sessionVariables = {QT_QPA_PLATFORMTHEME = "qt5ct";};
+
     environment.variables = {
       QT_STYLE_OVERRIDE = lib.mkForce "kvantum";
       GTK_THEME = theme.name;
     };
 
     home-manager.users.${username} = {
+      # This is taken from jacekpoz, thanks a lot!
       qt = {
         enable = true;
-        # style = {
-        #     inherit (cfg) name package;
-        # };
+        style = {
+          inherit (cfg) name;
+          package = cfg.package.override {
+            flavour = [cfg.variant];
+            accents = [cfg.accentColor];
+          };
+        };
       };
       home = {
         packages = with pkgs; [
           qt5.qttools
-          libsForQt5.qt5ct
+          qt6Packages.qtstyleplugin-kvantum
           libsForQt5.qtstyleplugin-kvantum
+          libsForQt5.qt5ct
           breeze-icons
         ];
+
+        sessionVariables = {
+          # Scaling factor for QT applications
+          QT_AUTO_SCREEN_SCALE_FACTOR = "1";
+
+          # Use wayland as the default backend, fall back to xcb if not available
+          QT_QPA_PLATFORM = "wayland;xcb";
+
+          # Disable window decorations for qt applications
+          QT_WAYLAND_DISABLE_WINDOWDECORATION = "1";
+
+          # Remain compatible with QT5 whenever possible
+          DISABLE_QT_COMPAT = "0";
+
+          # Tell Calibre to use the dark theme, because the light one hurts my eyes.
+          CALIBRE_USE_DARK_PALETTE = "1";
+        };
       };
     };
   };