Xfce: Difference between revisions

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 [https://wiki.haskell.org/Xmonad/Frequently_asked_questions#Problems_with_Java_applications.2C_Applet_java_console Haskell Wiki FAQ: Problems with Java applications]
+== Customizing xfce declaratively ==
+Xfce adheres to [https://en.wikipedia.org/wiki/Freedesktop.org XDG] desktop configuration, making it easy to declare user home directory configurations via [[Home Manager]]. xfce-specific configurations are stored in an [https://docs.xfce.org/xfce/xfconf/start xfconf database].
+=== Defining xfconf value ===
+Below assumes you have already enabled Home Manager in your NixOS configuration.
+Launching <code>xfce4-settings-editor</code> you can view xfce personalizations already applied to the system. They're displayed in a tree view, but stored in a flat string format. You can query these same values from the command line with <code>xfconf-query</code> to quickly get the full key and value in a friendlier format. For instance:
+{{file|||
+<nowiki>
+$ xfconf-query -c ristretto -lv
+/window/navigationbar/position  left
+/window/statusbar/show          true
+/window/toolbar/show            false
+</nowiki>
+}}
+Can be translated like so:
+{{file|/etc/nixos/configuration.nix|nix|
+<nowiki>
+# Xfce Home Manager customizations
+home-manager.users.${PRIMARY-USER} = { config, ... }: ({
+  xfconf = {
+    enable = true;
+    settings = {
+      ristretto = {
+        "window/navigationbar/position" = "left";
+        "window/statusbar/show" = true;
+        "window/toolbar/show" = false;
+      };
+    };
+  };
+})
+</nowiki>
+}}
+=== Using built-in wallpapers ===
+Similarly, if you wish to use a built-in wallpaper declaratively you could follow this same pattern:
+{{file|/etc/nixos/configuration.nix|nix|
+<nowiki>
+# Values based on `xfconf-query -c xfce4-desktop -lv`
+home-manager.users.${PRIMARY-USER} = { config, ... }: ({
+  xfconf = {
+    enable = true;
+    settings = {
+      xfce4-desktop = {
+        "backdrop/screen0/monitor0/workspace0/color-style" = 0;
+        "backdrop/screen0/monitor0/workspace0/image-style" = 5;
+        "backdrop/screen0/monitor0/workspace0/last-image" = "${pkgs.xfce.xfdesktop}/share/backgrounds/xfce/xfce-cp-dark.svg";
+      };
+    };
+  };
+})
+</nowiki>
+}}
+However, the xfce settings seem to persist across system rebuilds which can lead to the wallpaper being set to a nix store that is cleaned up when older system generations are cleaned up. In other words, the wallpaper may be replaced by a blank screen upon reboot seemingly randomly. One workaround for this is to set a static directory path for the images via a symlink and using that within xfconf.
+{{file|/etc/nixos/configuration.nix|nix|
+<nowiki>
+# ".xfce-wallpaper" directory is created below so that xfce's
+# settings aren't pointed to a dynamic, moving nix store path
+let background-dir = "/home/${PRIMARY-USER}/.xfce4-wallpapers";
+  background-image = "${background-dir}/xfce-cp-dark.svg";
+in {
+  home-manager.users.${PRIMARY-USER} = { config, ... }: ({
+    home.file.".xfce4-wallpapers".source = config.lib.file.mkOutOfStoreSymlink "${pkgs.xfce.xfdesktop}/share/backgrounds/xfce";
+    xfconf = {
+      enable = true;
+      settings = {
+        xfce4-desktop = {
+          "backdrop/screen0/monitor0/workspace0/color-style" = 0;
+          "backdrop/screen0/monitor0/workspace0/image-style" = 5;
+          "backdrop/screen0/monitor0/workspace0/last-image" = background-image;
+        };
+      };
+    };
+  })
+</nowiki>
+}}
 == Troubleshooting ==
 === Pulseaudio ===
 If you use pulse audio, set <code>nixpkgs.config.pulseaudio = true</code> as shown above. Otherwise, you may