1 files changed, 51 insertions, 0 deletions
diff --git a/modules/URLBarZoom.jsm b/modules/URLBarZoom.jsm
new file mode 100644
index 0000000..3e1c0f7
--- /dev/null
+++ b/modules/URLBarZoom.jsm
@@ -0,0 +1,51 @@
+// -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
+/* 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/. */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = [ "URLBarZoom" ];
+
+Components.utils.import("resource://gre/modules/Services.jsm");
+
+var URLBarZoom = {
+
+  init: function(aWindow) {
+    // Register ourselves with the service so we know when the zoom prefs change.
+    Services.obs.addObserver(updateZoomButton, "browser-fullZoom:zoomChange", false);
+    Services.obs.addObserver(updateZoomButton, "browser-fullZoom:zoomReset", false);
+    Services.obs.addObserver(updateZoomButton, "browser-fullZoom:location-change", false);
+  },
+}
+
+function updateZoomButton(aSubject, aTopic) {
+  let win = aSubject.ownerDocument.defaultView;
+  let customizableZoomControls = win.document.getElementById("zoom-controls");
+  let zoomResetButton = win.document.getElementById("urlbar-zoom-button");
+  let zoomFactor = Math.round(win.ZoomManager.zoom * 100);
+
+  // Ensure that zoom controls haven't already been added to browser in Customize Mode
+  if (customizableZoomControls &&
+      customizableZoomControls.getAttribute("cui-areatype") == "toolbar") {
+    zoomResetButton.hidden = true;
+    return;
+  }
+  if (zoomFactor != 100) {
+    // Check if zoom button is visible and update label if it is
+    if (zoomResetButton.hidden) {
+      zoomResetButton.hidden = false;
+    }
+    // Only allow pulse animation for zoom changes, not tab switching
+    if (aTopic != "browser-fullZoom:location-change") {
+      zoomResetButton.setAttribute("animate", "true");
+    } else {
+      zoomResetButton.removeAttribute("animate");
+    }
+    zoomResetButton.setAttribute("label",
+        win.gNavigatorBundle.getFormattedString("urlbar-zoom-button.label", [zoomFactor]));
+  // Hide button if zoom is at 100%
+  } else {
+      zoomResetButton.hidden = true;
+  }
+}