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/search_result.h"
  13 #include "ui/app_list/views/app_list_main_view.h"
  14 #include "ui/gfx/canvas.h"
  15 #include "ui/gfx/color_analysis.h"
  16 #include "ui/gfx/color_utils.h"
  17 #include "ui/views/background.h"
  18 #include "ui/views/controls/image_view.h"
  19 #include "ui/views/controls/label.h"
  20 #include "ui/views/layout/box_layout.h"
  21
  22 namespace {
  23
  24 const int kTileSize = 90;
  25 const int kTileHorizontalPadding = 10;
  26
  27 }  // namespace
  28
  29 namespace app_list {
  30
  31 TileItemView::TileItemView()
  32     : views::CustomButton(this),
  33       item_(NULL),
  34       icon_(new views::ImageView),
  35       title_(new views::Label) {
  36   views::BoxLayout* layout_manager = new views::BoxLayout(
  37       views::BoxLayout::kVertical, kTileHorizontalPadding, 0, 0);
  38   layout_manager->set_main_axis_alignment(
  39       views::BoxLayout::MAIN_AXIS_ALIGNMENT_CENTER);
  40   SetLayoutManager(layout_manager);
  41
  42   icon_->SetImageSize(gfx::Size(kTileIconSize, kTileIconSize));
  43
  44   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  45   title_->SetAutoColorReadabilityEnabled(false);
  46   title_->SetEnabledColor(kGridTitleColor);
  47   title_->set_background(views::Background::CreateSolidBackground(
  48       app_list::kContentsBackgroundColor));
  49   title_->SetFontList(rb.GetFontList(kItemTextFontStyle));
  50   title_->SetHorizontalAlignment(gfx::ALIGN_CENTER);
  51
  52   // When |item_| is NULL, the tile is invisible. Calling SetSearchResult with a
  53   // non-NULL item makes the tile visible.
  54   SetVisible(false);
  55
  56   AddChildView(icon_);
  57   AddChildView(title_);
  58 }
  59
  60 TileItemView::~TileItemView() {
  61   if (item_)
  62     item_->RemoveObserver(this);
  63 }
  64
  65 void TileItemView::SetSearchResult(SearchResult* item) {
  66   SetVisible(item != NULL);
  67
  68   SearchResult* old_item = item_;
  69   if (old_item)
  70     old_item->RemoveObserver(this);
  71
  72   item_ = item;
  73
  74   if (!item)
  75     return;
  76
  77   item_->AddObserver(this);
  78
  79   title_->SetText(item_->title());
  80
  81   // Only refresh the icon if it's different from the old one. This prevents
  82   // flickering.
  83   if (old_item == NULL ||
  84       !item->icon().BackedBySameObjectAs(old_item->icon())) {
  85     OnIconChanged();
  86   }
  87 }
  88
  89 gfx::Size TileItemView::GetPreferredSize() const {
  90   return gfx::Size(kTileSize, kTileSize);
  91 }
  92
  93 void TileItemView::ButtonPressed(views::Button* sender,
  94                                  const ui::Event& event) {
  95   item_->Open(event.flags());
  96 }
  97
  98 void TileItemView::OnIconChanged() {
  99   icon_->SetImage(item_->icon());
 100 }
 101
 102 void TileItemView::OnResultDestroying() {
 103   if (item_)
 104     item_->RemoveObserver(this);
 105   item_ = NULL;
 106 }
 107
 108 }  // namespace app_list