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