1 files changed, 90 insertions, 0 deletions
diff --git a/b2g/components/GlobalSimulatorScreen.jsm b/b2g/components/GlobalSimulatorScreen.jsm
new file mode 100644
index 000000000..2895aef96
--- /dev/null
+++ b/b2g/components/GlobalSimulatorScreen.jsm
@@ -0,0 +1,90 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+this.EXPORTED_SYMBOLS = [ 'GlobalSimulatorScreen' ];
+
+const Cu = Components.utils;
+
+Cu.import('resource://gre/modules/XPCOMUtils.jsm');
+Cu.import('resource://gre/modules/Services.jsm');
+
+this.GlobalSimulatorScreen = {
+  mozOrientationLocked: false,
+
+  // Actual orientation of apps
+  mozOrientation: 'portrait',
+
+  // The restricted list of actual orientation that can be used
+  // if mozOrientationLocked is true
+  lockedOrientation: [],
+
+  // The faked screen orientation
+  // if screenOrientation doesn't match mozOrientation due
+  // to lockedOrientation restriction, the app will be displayed
+  // on the side on desktop
+  screenOrientation: 'portrait',
+
+  // Updated by screen.js
+  width: 0, height: 0,
+
+  lock: function(orientation) {
+    this.mozOrientationLocked = true;
+
+    // Normalize to portrait or landscape,
+    // i.e. the possible values of screenOrientation
+    function normalize(str) {
+      if (str.match(/^portrait/)) {
+        return 'portrait';
+      } else if (str.match(/^landscape/)) {
+        return 'landscape';
+      } else {
+        return 'portrait';
+      }
+    }
+    this.lockedOrientation = orientation.map(normalize);
+
+    this.updateOrientation();
+  },
+
+  unlock: function() {
+    this.mozOrientationLocked = false;
+    this.updateOrientation();
+  },
+
+  updateOrientation: function () {
+    let orientation = this.screenOrientation;
+
+    // If the orientation is locked, we have to ensure ending up with a value
+    // of lockedOrientation. If none of lockedOrientation values matches
+    // the screen orientation we just choose the first locked orientation.
+    // This will be the precise scenario where the app is displayed on the
+    // side on desktop!
+    if (this.mozOrientationLocked &&
+        this.lockedOrientation.indexOf(this.screenOrientation) == -1) {
+      orientation = this.lockedOrientation[0];
+    }
+
+    // If the actual orientation changed,
+    // we have to fire mozorientation DOM events
+    if (this.mozOrientation != orientation) {
+      this.mozOrientation = orientation;
+
+      // Notify each app screen object to fire the event
+      Services.obs.notifyObservers(null, 'simulator-orientation-change', null);
+    }
+
+    // Finally, in any case, we update the window size and orientation
+    // (Use wrappedJSObject trick to be able to pass a raw JS object)
+    Services.obs.notifyObservers({wrappedJSObject:this}, 'simulator-adjust-window-size', null);
+  },
+
+  flipScreen: function() {
+    if (this.screenOrientation == 'portrait') {
+      this.screenOrientation = 'landscape';
+    } else if (this.screenOrientation == 'landscape') {
+      this.screenOrientation = 'portrait';
+    }
+    this.updateOrientation();
+  }
+}