chrome/browser/ui/tabs/hover_tab_selector.h

   1 // Copyright (c) 2011 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_TABS_HOVER_TAB_SELECTOR_H_
   6 #define CHROME_BROWSER_UI_TABS_HOVER_TAB_SELECTOR_H_
   7
   8 #include "base/memory/weak_ptr.h"
   9
  10 class TabStripModel;
  11
  12 // Helper class to perform "spring-loaded" tab transitions. Manages
  13 // the lifecycle of delayed tab transition tasks.
  14 class HoverTabSelector {
  15  public:
  16   explicit HoverTabSelector(TabStripModel* tab_strip_model);
  17   ~HoverTabSelector();
  18
  19   // Begin a delayed tab transition to the tab at |index|. Only starts
  20   // the transition if the specified tab is not active and there isn't
  21   // already a transition to it scheduled. Cancels the pending transition
  22   // to any other tab, if there is one.
  23   void StartTabTransition(int index);
  24
  25   // Cancel a pending tab transition. No-op if there is no pending transition.
  26   void CancelTabTransition();
  27
  28  private:
  29   // Performs the tab transition.
  30   void PerformTabTransition();
  31
  32   // Model of the tab strip on which this class operates.
  33   TabStripModel* tab_strip_model_;
  34
  35   // The model index of the tab to transition to.
  36   int tab_transition_tab_index_;
  37
  38   // Factory for creating tab transition tasks.
  39   base::WeakPtrFactory<HoverTabSelector> weak_factory_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(HoverTabSelector);
  42 };
  43
  44 #endif  // CHROME_BROWSER_UI_TABS_HOVER_TAB_SELECTOR_H_
  45