ui/app_list/views/page_switcher.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 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   ~PageSwitcher() override;
  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   gfx::Size GetPreferredSize() const override;
  38   void Layout() override;
  39
  40  private:
  41   void CalculateButtonWidthAndSpacing(int contents_width);
  42
  43   // Overridden from views::ButtonListener:
  44   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
  45
  46   // Overridden from PaginationModelObserver:
  47   void TotalPagesChanged() override;
  48   void SelectedPageChanged(int old_selected, int new_selected) override;
  49   void TransitionStarted() override;
  50   void TransitionChanged() override;
  51
  52   PaginationModel* model_;  // Owned by AppsGridView.
  53   views::View* buttons_;  // Owned by views hierarchy.
  54
  55   DISALLOW_COPY_AND_ASSIGN(PageSwitcher);
  56 };
  57
  58 }  // namespace app_list
  59
  60 #endif  // UI_APP_LIST_VIEWS_PAGE_SWITCHER_H_