chrome/browser/ui/views/ash/tab_scrubber.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_VIEWS_ASH_TAB_SCRUBBER_H_
   6 #define CHROME_BROWSER_UI_VIEWS_ASH_TAB_SCRUBBER_H_
   7
   8 #include "base/timer/timer.h"
   9 #include "chrome/browser/ui/views/frame/immersive_mode_controller.h"
  10 #include "chrome/browser/ui/views/tabs/tab_strip_observer.h"
  11 #include "content/public/browser/notification_observer.h"
  12 #include "content/public/browser/notification_registrar.h"
  13 #include "ui/base/animation/animation_delegate.h"
  14 #include "ui/base/events/event_handler.h"
  15
  16 class Browser;
  17 class TabStrip;
  18
  19 namespace gfx {
  20 class Point;
  21 }
  22
  23 // Class to enable quick tab switching via Ctrl-left-drag.
  24 // Notes: this is experimental, and disables ctrl-clicks. It should not be
  25 // enabled other than through flags until we implement 3 finger drag as the
  26 // mechanism to invoke it. At that point we will add test coverage.
  27 class TabScrubber : public ui::EventHandler,
  28                     public content::NotificationObserver,
  29                     public TabStripObserver {
  30  public:
  31   enum Direction {LEFT, RIGHT};
  32
  33   // Returns a the single instance of a TabScrubber.
  34   static TabScrubber* GetInstance();
  35
  36   // Returns the virtual position of a swipe starting in the tab at |index|,
  37   // base on the |direction|.
  38   static gfx::Point GetStartPoint(TabStrip* tab_strip,
  39                                   int index,
  40                                   TabScrubber::Direction direction);
  41
  42   void set_activation_delay(int activation_delay) {
  43     activation_delay_ = activation_delay;
  44     use_default_activation_delay_ = false;
  45   }
  46   int activation_delay() const { return activation_delay_; }
  47   int highlighted_tab() const { return highlighted_tab_; }
  48   bool IsActivationPending();
  49
  50  private:
  51   TabScrubber();
  52   virtual ~TabScrubber();
  53
  54   // ui::EventHandler overrides:
  55   virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE;
  56
  57   // content::NotificationObserver overrides:
  58   virtual void Observe(int type,
  59                        const content::NotificationSource& source,
  60                        const content::NotificationDetails& details) OVERRIDE;
  61
  62   // TabStripObserver overrides.
  63   virtual void TabStripAddedTabAt(TabStrip* tab_strip, int index) OVERRIDE;
  64   virtual void TabStripMovedTab(TabStrip* tab_strip,
  65                                 int from_index,
  66                                 int to_index) OVERRIDE;
  67   virtual void TabStripRemovedTabAt(TabStrip* tab_strip, int index) OVERRIDE;
  68   virtual void TabStripDeleted(TabStrip* tab_strip) OVERRIDE;
  69
  70   Browser* GetActiveBrowser();
  71   void FinishScrub(bool activate);
  72
  73   // Are we currently scrubbing?.
  74   bool scrubbing_;
  75   // The last browser we used for scrubbing, NULL if |scrubbing_| is
  76   // false and there is no pending work.
  77   Browser* browser_;
  78   // The current accumulated x and y positions of a swipe, in
  79   // the coordinates of the TabStrip of |browser_|
  80   float swipe_x_;
  81   float swipe_y_;
  82   // The direction the current swipe is headed.
  83   Direction swipe_direction_;
  84   // The index of the tab that is currently highlighted.
  85   int highlighted_tab_;
  86   // Timer to control a delayed activation of the |highlighted_tab_|.
  87   base::Timer activate_timer_;
  88   // Time to wait in ms before newly selected tab becomes active.
  89   int activation_delay_;
  90   // Set if activation_delay had been explicitly set.
  91   bool use_default_activation_delay_;
  92   // Forces the tabs to be revealed if we are in immersive fullscreen.
  93   scoped_ptr<ImmersiveRevealedLock> immersive_reveal_lock_;
  94
  95   content::NotificationRegistrar registrar_;
  96   base::WeakPtrFactory<TabScrubber> weak_ptr_factory_;
  97
  98   DISALLOW_COPY_AND_ASSIGN(TabScrubber);
  99 };
 100
 101 #endif  // CHROME_BROWSER_UI_VIEWS_ASH_TAB_SCRUBBER_H_