src/chrome/browser/ui/gtk/throbber_gtk.h

   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_THROBBER_GTK_H_
   6 #define CHROME_BROWSER_UI_GTK_THROBBER_GTK_H_
   7
   8 #include <gtk/gtk.h>
   9
  10 #include "base/compiler_specific.h"
  11 #include "content/public/browser/notification_observer.h"
  12 #include "content/public/browser/notification_registrar.h"
  13 #include "ui/base/gtk/gtk_signal.h"
  14 #include "ui/base/gtk/owned_widget_gtk.h"
  15 #include "ui/gfx/animation/animation_delegate.h"
  16 #include "ui/gfx/animation/slide_animation.h"
  17 #include "ui/gfx/image/image.h"
  18
  19 class GtkThemeService;
  20 class SkBitmap;
  21
  22 // An animating throbber.
  23 class ThrobberGtk : public gfx::AnimationDelegate,
  24                     public content::NotificationObserver {
  25  public:
  26   // |theme_service| must not be NULL.
  27   explicit ThrobberGtk(GtkThemeService* theme_service);
  28   virtual ~ThrobberGtk();
  29
  30   // Start or stop the throbbing animation.
  31   void Start();
  32   void Stop();
  33
  34   GtkWidget* widget() const { return widget_.get(); }
  35
  36   // gfx::AnimationDelegate implementation.
  37   virtual void AnimationEnded(const gfx::Animation* animation) OVERRIDE;
  38   virtual void AnimationProgressed(const gfx::Animation* animation) OVERRIDE;
  39
  40   // content::NotificationObserver implementation.
  41   virtual void Observe(int type,
  42                        const content::NotificationSource& source,
  43                        const content::NotificationDetails& details) OVERRIDE;
  44
  45  private:
  46   CHROMEGTK_CALLBACK_1(ThrobberGtk, gboolean, OnExpose, GdkEventExpose*);
  47
  48   // Initialize the widget.
  49   void Init();
  50
  51   // Load the animation frames from IDR_THROBBER.
  52   void LoadFrames();
  53
  54   content::NotificationRegistrar registrar_;
  55
  56   // The theme service. Weak pointer.
  57   GtkThemeService* theme_service_;
  58
  59   // The actual GtkWidget.
  60   ui::OwnedWidgetGtk widget_;
  61
  62   // A linear animation over the loaded frames.
  63   gfx::SlideAnimation animation_;
  64
  65   // The image containing the throbber frames.
  66   gfx::Image frames_;
  67
  68   // The number of frames in |frames_|.
  69   int num_frames_;
  70
  71   DISALLOW_COPY_AND_ASSIGN(ThrobberGtk);
  72 };
  73
  74 #endif  // CHROME_BROWSER_UI_GTK_THROBBER_GTK_H_