text: // 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/gtest_prod_util.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 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:
    FRIEND_TEST_ALL_PREFIXES(ZoomBubbleBrowserTest, ImmersiveFullscreen);
  
    // 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);
    ~ZoomBubbleView() override;
  
    // 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:
    void OnExtensionIconImageChanged(extensions::IconImage* /* image */) override;
  
    // views::View methods.
    void OnMouseEntered(const ui::MouseEvent& event) override;
    void OnMouseExited(const ui::MouseEvent& event) override;
  
    // ui::EventHandler method.
    void OnGestureEvent(ui::GestureEvent* event) override;
  
    // views::ButtonListener method.
    void ButtonPressed(views::Button* sender, const ui::Event& event) override;
  
    // views::BubbleDelegateView method.
    void Init() override;
    void WindowClosing() override;
  
    // content::NotificationObserver method.
    void Observe(int type,
                 const content::NotificationSource& source,
                 const content::NotificationDetails& details) override;
  
    // ImmersiveModeController::Observer methods.
    void OnImmersiveRevealStarted() override;
    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_
  