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      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
    109