Zoom Extension API

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

Index: chrome/browser/extensions/api/tabs/tabs_event_router.cc
diff --git a/chrome/browser/extensions/api/tabs/tabs_event_router.cc b/chrome/browser/extensions/api/tabs/tabs_event_router.cc
index edf2fb31aef8055e3fd6dae9e0625f268a2687da..21c033c8e4021874aa97d8ed73b96499a4f6003f 100644
--- a/chrome/browser/extensions/api/tabs/tabs_event_router.cc
+++ b/chrome/browser/extensions/api/tabs/tabs_event_router.cc
@@ -149,6 +149,9 @@ void TabsEventRouter::RegisterForTabNotifications(WebContents* contents) {
 
   registrar_.Add(this, chrome::NOTIFICATION_FAVICON_UPDATED,
                  content::Source<WebContents>(contents));
+
+  registrar_.Add(this, content::NOTIFICATION_WEB_CONTENTS_ZOOM_CHANGE,
+                 content::Source<WebContents>(contents));
 }
 
 void TabsEventRouter::UnregisterForTabNotifications(WebContents* contents) {
@@ -158,6 +161,8 @@ void TabsEventRouter::UnregisterForTabNotifications(WebContents* contents) {
       content::Source<WebContents>(contents));
   registrar_.Remove(this, chrome::NOTIFICATION_FAVICON_UPDATED,
       content::Source<WebContents>(contents));
+  registrar_.Remove(this, content::NOTIFICATION_WEB_CONTENTS_ZOOM_CHANGE,
+      content::Source<WebContents>(contents));
 }
 
 void TabsEventRouter::OnBrowserRemoved(Browser* browser) {
@@ -473,6 +478,27 @@ void TabsEventRouter::DispatchTabUpdatedEvent(
   ExtensionSystem::Get(profile)->event_router()->BroadcastEvent(event.Pass());
 }
 
+void TabsEventRouter::DispatchTabZoomChangeEvent(
+    WebContents* contents,
+    double old_zoom_factor,
+    double new_zoom_factor,
+    base::DictionaryValue* zoom_settings) {
+  DCHECK(contents);
+  scoped_ptr<base::ListValue> args(new base::ListValue);
+  int tab_id = ExtensionTabUtil::GetTabId(contents);
+  if (tab_id >= 0) {

[Fady Samuel, 2014/04/07 20:01:14]

Early exist preferred.

if (tab_id < 0)
  return;

[paulmeyer, 2014/04/07 20:56:10]

Done.

+    args->AppendInteger(tab_id);
+    args->AppendDouble(old_zoom_factor);
+    args->AppendDouble(new_zoom_factor);
+    args->Append(zoom_settings);
+
+    Profile* profile = Profile::FromBrowserContext(
+        contents->GetBrowserContext());
+    DispatchEvent(profile, tabs::OnZoomChange::kEventName, args.Pass(),
+                  EventRouter::USER_GESTURE_UNKNOWN);
+  }
+}
+
 TabsEventRouter::TabEntry* TabsEventRouter::GetTabEntry(
     const WebContents* contents) {
   int tab_id = ExtensionTabUtil::GetTabId(contents);
@@ -502,6 +528,17 @@ void TabsEventRouter::Observe(int type,
     bool icon_url_changed = *content::Details<bool>(details).ptr();
     if (icon_url_changed)
       FaviconUrlUpdated(content::Source<WebContents>(source).ptr());
+  } else if (type == content::NOTIFICATION_WEB_CONTENTS_ZOOM_CHANGE) {
+    content::ZoomChangeDetails zoom_change_details =
+        *content::Details<content::ZoomChangeDetails>(details).ptr();
+    double old_zoom_factor =
+        content::ZoomLevelToZoomFactor(zoom_change_details.old_zoom_level);
+    double new_zoom_factor =
+        content::ZoomLevelToZoomFactor(zoom_change_details.new_zoom_level);
+    base::DictionaryValue* zoom_settings = new base::DictionaryValue();
+    ZoomModeToZoomSettings(zoom_change_details.zoom_mode, zoom_settings);
+    DispatchTabZoomChangeEvent(content::Source<WebContents>(source).ptr(),
+                               old_zoom_factor, new_zoom_factor, zoom_settings);
   } else {
     NOTREACHED();
   }