Zoom Extension API

chrome/browser/extensions/api/tabs/tabs_event_router.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/api/tabs/tabs_event_router.h"
 
 #include "base/json/json_writer.h"
 #include "base/values.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/api/tabs/tabs_constants.h"
@@ skipping 536 matching lines @@
 
   if (ExtensionTabUtil::GetTabStripModel(contents, &tab_strip, &tab_index)) {
     scoped_ptr<base::DictionaryValue> changed_properties(
         new base::DictionaryValue());
     changed_properties->SetBoolean(tabs_constants::kPinnedKey,
                                    tab_strip->IsTabPinned(tab_index));
     DispatchTabUpdatedEvent(contents, changed_properties.Pass());
   }
 }
 
+void TabsEventRouter::TabZoomChange(content::WebContents* contents,
+                                    double old_zoom_level,
+                                    double new_zoom_level,
+                                    content::ZoomMode zoom_mode) {
+  DCHECK(contents);
+  int tab_id = ExtensionTabUtil::GetTabId(contents);
+  if (tab_id < 0)
+    return;
+
+  // Prepare the zoom change information.
+  api::tabs::OnZoomChange::ZoomChangeInfo zoom_change_info;
+  zoom_change_info.tab_id = tab_id;
+  zoom_change_info.old_zoom_factor =
+      content::ZoomLevelToZoomFactor(old_zoom_level);
+  zoom_change_info.new_zoom_factor =
+      content::ZoomLevelToZoomFactor(new_zoom_level);
+  ZoomModeToZoomSettings(zoom_mode, &zoom_change_info.zoom_settings);
+
+  // Dispatch the |onZoomChange| event.
+  Profile* profile = Profile::FromBrowserContext(
+      contents->GetBrowserContext());
+  DispatchEvent(profile, tabs::OnZoomChange::kEventName,
+                api::tabs::OnZoomChange::Create(zoom_change_info),
+                EventRouter::USER_GESTURE_UNKNOWN);
+}
+
 }  // namespace extensions