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 set_activation_delay(int activation_delay)41 void set_activation_delay(int activation_delay) { 42 activation_delay_ = activation_delay; 43 use_default_activation_delay_ = false; 44 } activation_delay()45 int activation_delay() const { return activation_delay_; } highlighted_tab()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_ 101