ui/app_list/views/tile_item_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/tile_item_view.h"
   6
   7 #include "base/strings/utf_string_conversions.h"
   8 #include "ui/app_list/app_list_constants.h"
   9 #include "ui/app_list/app_list_item.h"
  10 #include "ui/app_list/app_list_model.h"
  11 #include "ui/app_list/app_list_view_delegate.h"
  12 #include "ui/app_list/views/app_list_main_view.h"
  13 #include "ui/gfx/canvas.h"
  14 #include "ui/gfx/color_analysis.h"
  15 #include "ui/gfx/color_utils.h"
  16 #include "ui/views/background.h"
  17 #include "ui/views/controls/image_view.h"
  18 #include "ui/views/controls/label.h"
  19 #include "ui/views/layout/box_layout.h"
  20
  21 namespace {
  22
  23 const int kTileSize = 90;
  24 const int kTileHorizontalPadding = 10;
  25 const int kTileImageSize = 48;
  26
  27 const SkColor kTileBackgroundColor = SK_ColorWHITE;
  28 const int kTileColorStripHeight = 2;
  29 const SkAlpha kTileColorStripOpacity = 0X5F;
  30 const int kTileCornerRadius = 2;
  31
  32 }  // namespace
  33
  34 namespace app_list {
  35
  36 // A background for the start page item view which consists of a rounded rect
  37 // with a dominant color strip at the bottom.
  38 class TileItemView::TileItemBackground : public views::Background {
  39  public:
  40   TileItemBackground() : strip_color_(SK_ColorBLACK) {}
  41   virtual ~TileItemBackground() {}
  42
  43   void set_strip_color(SkColor strip_color) { strip_color_ = strip_color; }
  44
  45   // Overridden from views::Background:
  46   virtual void Paint(gfx::Canvas* canvas, views::View* view) const OVERRIDE {
  47     SkPaint paint;
  48     paint.setFlags(SkPaint::kAntiAlias_Flag);
  49
  50     // Paint the border.
  51     paint.setColor(kStartPageBorderColor);
  52     canvas->DrawRoundRect(view->GetContentsBounds(), kTileCornerRadius, paint);
  53
  54     // Paint a rectangle for the color strip.
  55     gfx::Rect color_strip_rect(view->GetContentsBounds());
  56     color_strip_rect.Inset(1, 1, 1, 1);
  57     paint.setColor(SkColorSetA(strip_color_, kTileColorStripOpacity));
  58     canvas->DrawRoundRect(color_strip_rect, kTileCornerRadius, paint);
  59
  60     // Paint the main background rectangle, leaving part of the color strip
  61     // unobscured.
  62     gfx::Rect static_background_rect(color_strip_rect);
  63     static_background_rect.Inset(0, 0, 0, kTileColorStripHeight);
  64     paint.setColor(kTileBackgroundColor);
  65     canvas->DrawRoundRect(static_background_rect, kTileCornerRadius, paint);
  66   }
  67
  68  private:
  69   SkColor strip_color_;
  70
  71   DISALLOW_COPY_AND_ASSIGN(TileItemBackground);
  72 };
  73
  74 TileItemView::TileItemView()
  75     : views::CustomButton(this),
  76       item_(NULL),
  77       icon_(new views::ImageView),
  78       title_(new views::Label),
  79       background_(new TileItemBackground()) {
  80   set_background(background_);
  81
  82   views::BoxLayout* layout_manager = new views::BoxLayout(
  83       views::BoxLayout::kVertical, kTileHorizontalPadding, 0, 0);
  84   layout_manager->set_main_axis_alignment(
  85       views::BoxLayout::MAIN_AXIS_ALIGNMENT_CENTER);
  86   SetLayoutManager(layout_manager);
  87
  88   icon_->SetImageSize(gfx::Size(kTileImageSize, kTileImageSize));
  89
  90   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  91   title_->SetAutoColorReadabilityEnabled(false);
  92   title_->SetEnabledColor(kGridTitleColor);
  93   title_->SetFontList(rb.GetFontList(kItemTextFontStyle));
  94   title_->SetHorizontalAlignment(gfx::ALIGN_CENTER);
  95
  96   // When |item_| is NULL, the tile is invisible. Calling SetAppListItem with a
  97   // non-NULL item makes the tile visible.
  98   SetVisible(false);
  99
 100   AddChildView(icon_);
 101   AddChildView(title_);
 102 }
 103
 104 TileItemView::~TileItemView() {
 105 }
 106
 107 void TileItemView::SetAppListItem(AppListItem* item) {
 108   // TODO(calamity): This will not update if the contents of |item_| have
 109   // changed since it was last assigned. Add an observer to refresh when the
 110   // item changes.
 111   if (item == item_)
 112     return;
 113
 114   item_ = item;
 115   if (!item) {
 116     SetVisible(false);
 117     icon_->SetImage(NULL);
 118     title_->SetText(base::string16());
 119     return;
 120   }
 121
 122   SetVisible(true);
 123   icon_->SetImage(item_->icon());
 124   title_->SetText(base::UTF8ToUTF16(item_->name()));
 125
 126   background_->set_strip_color(
 127       color_utils::CalculateKMeanColorOfBitmap(*item_->icon().bitmap()));
 128 }
 129
 130 gfx::Size TileItemView::GetPreferredSize() const {
 131   return gfx::Size(kTileSize, kTileSize);
 132 }
 133
 134 void TileItemView::ButtonPressed(views::Button* sender,
 135                                  const ui::Event& event) {
 136   item_->Activate(event.flags());
 137 }
 138
 139 }  // namespace app_list