Zoom Extension API (chrome)

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 130 matching lines @@
 
   // Observing NOTIFICATION_WEB_CONTENTS_DESTROYED is necessary because it's
   // possible for tabs to be created, detached and then destroyed without
   // ever having been re-attached and closed. This happens in the case of
   // a devtools WebContents that is opened in window, docked, then closed.
   registrar_.Add(this, content::NOTIFICATION_WEB_CONTENTS_DESTROYED,
                  content::Source<WebContents>(contents));
 
   registrar_.Add(this, chrome::NOTIFICATION_FAVICON_UPDATED,
                  content::Source<WebContents>(contents));
+
+  ZoomController::FromWebContents(contents)->AddObserver(this);
 }
 
 void TabsEventRouter::UnregisterForTabNotifications(WebContents* contents) {
   registrar_.Remove(this, content::NOTIFICATION_NAV_ENTRY_COMMITTED,
       content::Source<NavigationController>(&contents->GetController()));
   registrar_.Remove(this, content::NOTIFICATION_WEB_CONTENTS_DESTROYED,
       content::Source<WebContents>(contents));
   registrar_.Remove(this, chrome::NOTIFICATION_FAVICON_UPDATED,
       content::Source<WebContents>(contents));
+
+  ZoomController::FromWebContents(contents)->RemoveObserver(this);
 }
 
 void TabsEventRouter::OnBrowserRemoved(Browser* browser) {
   if (!profile_->IsSameProfile(browser->profile()))
     return;
 
   // Stop listening to TabStripModel events for this browser.
   browser->tab_strip_model()->RemoveObserver(this);
 }
 
@@ skipping 375 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::OnZoomChanged(
+    const ZoomController::ZoomChangedEventData& data) {
+  DCHECK(data.web_contents);
+  int tab_id = ExtensionTabUtil::GetTabId(data.web_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(data.old_zoom_level);
+  zoom_change_info.new_zoom_factor =
+      content::ZoomLevelToZoomFactor(data.new_zoom_level);
+  ZoomModeToZoomSettings(data.zoom_mode,
+                         &zoom_change_info.zoom_settings);
+
+  // Dispatch the |onZoomChange| event.
+  Profile* profile = Profile::FromBrowserContext(
+      data.web_contents->GetBrowserContext());
+  DispatchEvent(profile,
+                tabs::OnZoomChange::kEventName,
+                api::tabs::OnZoomChange::Create(zoom_change_info),
+                EventRouter::USER_GESTURE_UNKNOWN);
+}
+
 }  // namespace extensions