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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 UI_APP_LIST_VIEWS_PAGE_SWITCHER_H_
      6 #define UI_APP_LIST_VIEWS_PAGE_SWITCHER_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "ui/app_list/pagination_model_observer.h"
     10 #include "ui/views/controls/button/button.h"
     11 #include "ui/views/view.h"
     12 
     13 namespace app_list {
     14 
     15 class PaginationModel;
     16 
     17 // PageSwitcher represents its underlying PaginationModel with a button strip.
     18 // Each page in the PageinationModel has a button in the strip and when the
     19 // button is clicked, the corresponding page becomes selected.
     20 class PageSwitcher : public views::View,
     21                      public views::ButtonListener,
     22                      public PaginationModelObserver {
     23  public:
     24   explicit PageSwitcher(PaginationModel* model);
     25   virtual ~PageSwitcher();
     26 
     27   // Returns the page index of the page switcher button under the point. If no
     28   // page switcher button is under the point, -1 is return. |point| is in
     29   // PageSwitcher's coordinates.
     30   int GetPageForPoint(const gfx::Point& point) const;
     31 
     32   // Shows hover for button under the point. |point| is in PageSwitcher's
     33   // coordinates.
     34   void UpdateUIForDragPoint(const gfx::Point& point);
     35 
     36   // Overridden from views::View:
     37   virtual gfx::Size GetPreferredSize() OVERRIDE;
     38   virtual void Layout() OVERRIDE;
     39 
     40  private:
     41   void CalculateButtonWidthAndSpacing(int contents_width);
     42 
     43   // Overridden from views::ButtonListener:
     44   virtual void ButtonPressed(views::Button* sender,
     45                              const ui::Event& event) OVERRIDE;
     46 
     47   // Overridden from PaginationModelObserver:
     48   virtual void TotalPagesChanged() OVERRIDE;
     49   virtual void SelectedPageChanged(int old_selected, int new_selected) OVERRIDE;
     50   virtual void TransitionStarted() OVERRIDE;
     51   virtual void TransitionChanged() OVERRIDE;
     52 
     53   PaginationModel* model_;  // Owned by parent AppListView.
     54   views::View* buttons_;  // Owned by views hierarchy.
     55 
     56   DISALLOW_COPY_AND_ASSIGN(PageSwitcher);
     57 };
     58 
     59 }  // namespace app_list
     60 
     61 #endif  // UI_APP_LIST_VIEWS_PAGE_SWITCHER_H_
     62