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gaia/apps/verticalhome/js/wallpaper.js

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+'use strict';
+/* global ForwardLock, MozActivity */
+
+(function(exports) {
+
+  function Wallpaper() {
+    // Do nothing...
+  }
+
+  Wallpaper.prototype = {
+    change: function() {
+      // Ask for the locked content key first, because if it does not exist
+      // we know there is no locked content on the phone and we don't have
+      // to show the Locked Content app in the activity request.
+      ForwardLock.getKey(function(secret) {
+        var activity = new MozActivity({
+          name: 'pick',
+          data: {
+            type: ['wallpaper', 'image/*'],
+            includeLocked: (secret !== null),
+            // XXX: This will not work with Desktop Fx / Simulator.
+            width: Math.ceil(window.screen.width * window.devicePixelRatio),
+            height: Math.ceil(window.screen.height * window.devicePixelRatio)
+          }
+        });
+
+        activity.onsuccess = function onWallpaperSuccess() {
+          var blob = activity.result.blob;
+
+          if (!blob) {
+            return;
+          }
+
+          // If this is a locked image from the locked content app, unlock it
+          if (blob.type.split('/')[1] === ForwardLock.mimeSubtype) {
+            ForwardLock.unlockBlob(secret, blob, function(unlocked) {
+              setWallpaper(unlocked);
+            });
+          } else {
+            setWallpaper(blob);
+          }
+
+          function setWallpaper(blob) {
+            navigator.mozSettings.createLock().set({
+              'wallpaper.image': blob
+            });
+          }
+        };
+
+        activity.onerror = function onWallpaperError() {
+          console.warn('pick failed!');
+        };
+      });
+    }
+  };
+
+  exports.wallpaper = new Wallpaper();
+
+}(window));