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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CHROME_BROWSER_UI_GTK_ZOOM_BUBBLE_GTK_H_
      6 #define CHROME_BROWSER_UI_GTK_ZOOM_BUBBLE_GTK_H_
      7 
      8 #include <gtk/gtk.h>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/timer/timer.h"
     12 #include "chrome/browser/ui/gtk/bubble/bubble_gtk.h"
     13 #include "content/public/browser/notification_observer.h"
     14 #include "content/public/browser/notification_registrar.h"
     15 #include "ui/base/gtk/gtk_signal.h"
     16 
     17 typedef struct _GtkWidget GtkWidget;
     18 
     19 class FullscreenController;
     20 
     21 namespace content {
     22 class NotificationDetails;
     23 class NotificationSource;
     24 class WebContents;
     25 }
     26 
     27 class ZoomBubbleGtk : public content::NotificationObserver {
     28  public:
     29   // Shows the zoom bubble below |anchor_widget| with an arrow pointing at
     30   // |anchor_widget|. If |anchor_widget| is a toplevel window, the bubble will
     31   // fixed positioned in the top right of corner of the widget with no arrow.
     32   static void ShowBubble(content::WebContents* web_contents,
     33                          bool auto_close);
     34 
     35   // Whether the zoom bubble is currently showing.
     36   static bool IsShowing();
     37 
     38   // Closes the zoom bubble (if there is one).
     39   static void CloseBubble();
     40 
     41  private:
     42   ZoomBubbleGtk(GtkWidget* anchor,
     43                 content::WebContents* web_contents,
     44                 bool auto_close,
     45                 FullscreenController* fullscreen_controller);
     46 
     47   virtual ~ZoomBubbleGtk();
     48 
     49   // content::NotificationObserver:
     50   virtual void Observe(int type,
     51                        const content::NotificationSource& source,
     52                        const content::NotificationDetails& details) OVERRIDE;
     53 
     54   // Convenience method to start |timer_| if |auto_close_| is true.
     55   void StartTimerIfNecessary();
     56 
     57   // Stops any close timer if |timer_| is currently running.
     58   void StopTimerIfNecessary();
     59 
     60   // Refreshes the bubble by changing the zoom percentage appropriately and
     61   // resetting the timer if necessary.
     62   void Refresh();
     63 
     64   // Closes the zoom bubble.
     65   void Close();
     66 
     67   // Notified when the bubble is destroyed so this instance can be deleted.
     68   CHROMEGTK_CALLBACK_0(ZoomBubbleGtk, void, OnDestroy);
     69 
     70   // Fired when the reset link is clicked.
     71   CHROMEGTK_CALLBACK_0(ZoomBubbleGtk, void, OnSetDefaultLinkClick);
     72 
     73   // Fired when the mouse enters or leaves the widget.
     74   CHROMEGTK_CALLBACK_1(ZoomBubbleGtk, gboolean, OnMouseEnter,
     75                        GdkEventCrossing*);
     76   CHROMEGTK_CALLBACK_1(ZoomBubbleGtk, gboolean, OnMouseLeave,
     77                        GdkEventCrossing*);
     78 
     79   // Whether the currently displayed bubble will automatically close.
     80   bool auto_close_;
     81 
     82   // Whether the mouse is currently inside the bubble.
     83   bool mouse_inside_;
     84 
     85   // Timer used to close the bubble when |auto_close_| is true.
     86   base::OneShotTimer<ZoomBubbleGtk> timer_;
     87 
     88   // The WebContents for the page whose zoom has changed.
     89   content::WebContents* web_contents_;
     90 
     91   // An event box that wraps the content of the bubble.
     92   GtkWidget* event_box_;
     93 
     94   // Label showing zoom percentage.
     95   GtkWidget* label_;
     96 
     97   // The BubbleGtk object containing the zoom bubble's content.
     98   BubbleGtk* bubble_;
     99 
    100   // Used to register for fullscreen change notifications.
    101   content::NotificationRegistrar registrar_;
    102 
    103   DISALLOW_COPY_AND_ASSIGN(ZoomBubbleGtk);
    104 };
    105 
    106 #endif  // CHROME_BROWSER_UI_GTK_ZOOM_BUBBLE_GTK_H_
    107