Zoom Extension API (chrome)

chrome/browser/ui/views/location_bar/zoom_bubble_view.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_ZOOM_BUBBLE_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_ZOOM_BUBBLE_VIEW_H_
 
 #include "base/basictypes.h"
 #include "base/timer/timer.h"
 #include "chrome/browser/ui/views/frame/immersive_mode_controller.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
+#include "extensions/browser/extension_icon_image.h"
 #include "ui/views/bubble/bubble_delegate.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/controls/label.h"
 
 class FullscreenController;
 
 namespace content {
 class NotificationDetails;
 class NotificationSource;
 class WebContents;
 }
 
+namespace views {
+class ImageButton;
+}  // namespace views
+
 // View used to display the zoom percentage when it has changed.
 class ZoomBubbleView : public views::BubbleDelegateView,
                        public views::ButtonListener,
                        public content::NotificationObserver,
-                       public ImmersiveModeController::Observer {
+                       public ImmersiveModeController::Observer,
+                       public extensions::IconImage::Observer {
  public:
   // Shows the bubble and automatically closes it after a short time period if
   // |auto_close| is true.
   static void ShowBubble(content::WebContents* web_contents,
                          bool auto_close);
 
   // Closes the showing bubble (if one exists).
   static void CloseBubble();
 
   // Whether the zoom bubble is currently showing.
   static bool IsShowing();
 
   // Returns the zoom bubble if the zoom bubble is showing. Returns NULL
   // otherwise.
   static const ZoomBubbleView* GetZoomBubbleForTest();
 
  private:
+  // Stores information about the extension that initiated the zoom change, if
+  // any.
+  struct ZoomBubbleExtensionInfo {
+    ZoomBubbleExtensionInfo();
+    ~ZoomBubbleExtensionInfo();
+
+    // The unique id of the extension, which is used to find the correct
+    // extension after clicking on the image button in the zoom bubble.
+    std::string id;
+
+    // The name of the extension, which appears in the tooltip of the image
+    // button in the zoom bubble.
+    std::string name;
+
+    // An image of the extension's icon, which appears in the zoom bubble as an
+    // image button.
+    scoped_ptr<const extensions::IconImage> icon_image;
+  };
+
   ZoomBubbleView(views::View* anchor_view,
                  content::WebContents* web_contents,
                  bool auto_close,
                  ImmersiveModeController* immersive_mode_controller,
                  FullscreenController* fullscreen_controller);
   virtual ~ZoomBubbleView();
 
   // If the bubble is not anchored to a view, places the bubble in the top
   // right (left in RTL) of the |screen_bounds| that contain |web_contents_|'s
   // browser window. Because the positioning is based on the size of the
   // bubble, this must be called after the bubble is created.
   void AdjustForFullscreen(const gfx::Rect& screen_bounds);
 
   // Refreshes the bubble by changing the zoom percentage appropriately and
   // resetting the timer if necessary.
   void Refresh();
 
   void Close();
 
+  // Sets information about the extension that initiated the zoom change.
+  // Calling this method asserts that the extension |extension| did initiate
+  // the zoom change.
+  void SetExtensionInfo(const extensions::Extension* extension);
+
   // Starts a timer which will close the bubble if |auto_close_| is true.
   void StartTimerIfNecessary();
 
   // Stops the auto-close timer.
   void StopTimer();
 
+  // extensions::IconImage::Observer overrides:
+  virtual void OnExtensionIconImageChanged(
+      extensions::IconImage* /* image */) OVERRIDE;
+
   // views::View methods.
   virtual void OnMouseEntered(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseExited(const ui::MouseEvent& event) OVERRIDE;
 
   // ui::EventHandler method.
   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
   // views::ButtonListener method.
   virtual void ButtonPressed(views::Button* sender,
                              const ui::Event& event) OVERRIDE;
 
   // views::BubbleDelegateView method.
   virtual void Init() OVERRIDE;
   virtual void WindowClosing() OVERRIDE;
 
   // content::NotificationObserver method.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // ImmersiveModeController::Observer methods.
   virtual void OnImmersiveRevealStarted() OVERRIDE;
   virtual void OnImmersiveModeControllerDestroyed() OVERRIDE;
 
+  ZoomBubbleExtensionInfo extension_info_;
+
   // Singleton instance of the zoom bubble. The zoom bubble can only be shown on
   // the active browser window, so there is no case in which it will be shown
   // twice at the same time.
   static ZoomBubbleView* zoom_bubble_;
 
   // Timer used to close the bubble when |auto_close_| is true.
   base::OneShotTimer<ZoomBubbleView> timer_;
 
+  // Image button in the zoom bubble that will show the |extension_icon_| image
+  // if an extension initiated the zoom change, and links to that extension at
+  // "chrome://extensions".
+  views::ImageButton* image_button_;
+
   // Label displaying the zoom percentage.
   views::Label* label_;
 
   // The WebContents for the page whose zoom has changed.
   content::WebContents* web_contents_;
 
   // Whether the currently displayed bubble will automatically close.
   bool auto_close_;
 
   // The immersive mode controller for the BrowserView containing
   // |web_contents_|.
   // Not owned.
   ImmersiveModeController* immersive_mode_controller_;
 
   // Used to register for fullscreen change notifications.
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ZoomBubbleView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_ZOOM_BUBBLE_VIEW_H_