library: Add Wallpaper entry (#333)

src/Library/demos/Wallpaper/main.blp

@@ -0,0 +1,25 @@
+using Gtk 4.0;
+using Adw 1;
+
+Adw.StatusPage {
+  title: _("Wallpaper");
+  description: _("Request to set the user desktop background image");
+  margin-top: 48;
+
+  Box {
+    orientation: vertical;
+    halign: center;
+
+    Button button {
+      label: _("Set Wallpaper");
+      margin-bottom: 42;
+      halign: center;
+      styles ["suggested-action", "pill"]
+    }
+
+    LinkButton {
+      label: "API Reference";
+      uri: "https://libportal.org/method.Portal.set_wallpaper.html";
+    }
+  }
+}

src/Library/demos/Wallpaper/main.js

@@ -0,0 +1,34 @@
+import Gio from "gi://Gio";
+import Xdp from "gi://Xdp";
+import XdpGtk from "gi://XdpGtk4";
+
+const portal = new Xdp.Portal();
+const parent = XdpGtk.parent_new_gtk(workbench.window);
+const button = workbench.builder.get_object("button");
+
+const file = Gio.File.new_for_path(pkg.pkgdatadir).resolve_relative_path(
+  "Library/demos/Wallpaper/wallpaper.png",
+);
+
+Gio._promisify(Xdp.Portal.prototype, "set_wallpaper", "set_wallpaper_finish");
+
+async function onClicked() {
+  const success = await portal.set_wallpaper(
+    parent,
+    file.get_uri(),
+    Xdp.WallpaperFlags.PREVIEW |
+      Xdp.WallpaperFlags.BACKGROUND |
+      Xdp.WallpaperFlags.LOCKSCREEN,
+    null,
+  );
+
+  if (success) {
+    console.log("Wallpaper set successfully");
+  } else {
+    console.log("Could not set wallpaper");
+  }
+}
+
+button.connect("clicked", () => {
+  onClicked().catch(logError);
+});

src/Library/demos/Wallpaper/main.json

@@ -0,0 +1,7 @@
+{
+  "name": "Wallpaper",
+  "category": "platform",
+  "description": "Request to set the user desktop background image",
+  "panels": ["code", "preview"],
+  "autorun": true
+}

src/about.js

@@ -47,7 +47,10 @@ ${getBlueprintVersion()}
       "Sonny Piers https://sonny.re",
       "Tobias Bernard <tbernard@gnome.org>",
     ],
-    artists: ["Tobias Bernard <tbernard@gnome.org>"],
+    artists: [
+      "Tobias Bernard <tbernard@gnome.org>",
+      "Jakub Steiner https://jimmac.eu",
+    ],
   });
 
   dialog.add_credit_section(_("Contributors"), [