src/ui/app_list/views/contents_switcher_view.cc

   1 // Copyright 2014 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 #include "ui/app_list/views/contents_switcher_view.h"
   6
   7 #include "ui/app_list/app_list_constants.h"
   8 #include "ui/app_list/views/contents_view.h"
   9 #include "ui/views/background.h"
  10 #include "ui/views/controls/button/custom_button.h"
  11 #include "ui/views/controls/button/image_button.h"
  12 #include "ui/views/layout/box_layout.h"
  13 #include "ui/views/layout/fill_layout.h"
  14
  15 namespace app_list {
  16
  17 namespace {
  18
  19 const int kButtonImageSize = 32;
  20 const int kButtonSpacing = 4;
  21
  22 class ContentsPageIndicatorView : public views::View {
  23  public:
  24   ContentsPageIndicatorView() {};
  25   virtual ~ContentsPageIndicatorView() {};
  26
  27   // Overridden from views::View:
  28   virtual gfx::Size GetPreferredSize() const OVERRIDE {
  29     return gfx::Size(0, kContentsSwitcherSeparatorHeight);
  30   };
  31
  32  private:
  33   DISALLOW_COPY_AND_ASSIGN(ContentsPageIndicatorView);
  34 };
  35
  36 }  // namespace
  37
  38 ContentsSwitcherView::ContentsSwitcherView(ContentsView* contents_view)
  39     : contents_view_(contents_view) {
  40   views::BoxLayout* layout = new views::BoxLayout(
  41       views::BoxLayout::kHorizontal, 0, 0, kButtonSpacing);
  42   layout->set_main_axis_alignment(views::BoxLayout::MAIN_AXIS_ALIGNMENT_CENTER);
  43   SetLayoutManager(layout);
  44 }
  45
  46 ContentsSwitcherView::~ContentsSwitcherView() {}
  47
  48 void ContentsSwitcherView::AddSwitcherButton(int resource_id, int page_index) {
  49   views::ImageButton* button = new views::ImageButton(this);
  50   button->SetPreferredSize(gfx::Size(kButtonImageSize, kButtonImageSize));
  51   if (resource_id) {
  52     button->SetImage(
  53         views::CustomButton::STATE_NORMAL,
  54         ui::ResourceBundle::GetSharedInstance().GetImageSkiaNamed(resource_id));
  55   }
  56   button->set_tag(page_index);
  57
  58   // Add an indicator for the current launcher page.
  59   app_list::ContentsPageIndicatorView* indicator =
  60       new app_list::ContentsPageIndicatorView();
  61   indicator->set_background(
  62       views::Background::CreateSolidBackground(app_list::kPagerSelectedColor));
  63   indicator->SetVisible(false);
  64   page_active_indicators_.push_back(indicator);
  65
  66   // A container view that will consume space when its child is not visible.
  67   // TODO(calamity): Remove this once BoxLayout supports space-consuming
  68   // invisible views.
  69   views::View* indicator_container = new views::View();
  70   indicator_container->SetLayoutManager(new views::FillLayout());
  71   indicator_container->AddChildView(indicator);
  72
  73   // View containing the indicator view and image button.
  74   views::View* button_container = new views::View();
  75   button_container->SetLayoutManager(
  76       new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 0));
  77   button_container->AddChildView(indicator_container);
  78   button_container->AddChildView(button);
  79
  80   AddChildView(button_container);
  81 }
  82
  83 void ContentsSwitcherView::ButtonPressed(views::Button* sender,
  84                                          const ui::Event& event) {
  85   contents_view_->SetActivePage(sender->tag());
  86 }
  87
  88 void ContentsSwitcherView::TotalPagesChanged() {
  89 }
  90
  91 void ContentsSwitcherView::SelectedPageChanged(int old_selected,
  92                                                int new_selected) {
  93   // Makes the indicator visible when it is first drawn and when the
  94   // selected page is changed.
  95   int num_indicators = static_cast<int>(page_active_indicators_.size());
  96   if (old_selected >= 0 && old_selected < num_indicators)
  97     page_active_indicators_[old_selected]->SetVisible(false);
  98
  99   if (new_selected >= 0 && new_selected < num_indicators)
 100     page_active_indicators_[new_selected]->SetVisible(true);
 101 }
 102
 103 void ContentsSwitcherView::TransitionStarted() {
 104 }
 105
 106 void ContentsSwitcherView::TransitionChanged() {
 107   // Change the indicator during a launcher page transition.
 108   const PaginationModel& pm = contents_view_->pagination_model();
 109   int old_selected = pm.selected_page();
 110   int new_selected = pm.transition().target_page;
 111   if (pm.IsRevertingCurrentTransition()) {
 112     // Swap the direction if the transition is reversed.
 113     old_selected = pm.transition().target_page;
 114     new_selected = pm.selected_page();
 115   }
 116
 117   SelectedPageChanged(old_selected, new_selected);
 118 }
 119
 120 }  // namespace app_list