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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_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_
    102