Experimental app list: Added "All apps" button on start page.

ui/app_list/views/search_result_tile_item_view.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/app_list/views/search_result_tile_item_view.h"
+
+#include "ui/app_list/search_result.h"
+
+namespace app_list {
+
+SearchResultTileItemView::SearchResultTileItemView() : item_(NULL) {
+}
+
+SearchResultTileItemView::~SearchResultTileItemView() {
+  if (item_)
+    item_->RemoveObserver(this);
+}
+
+void SearchResultTileItemView::SetSearchResult(SearchResult* item) {
+  SetVisible(item != NULL);
+
+  SearchResult* old_item = item_;
+  if (old_item)
+    old_item->RemoveObserver(this);
+
+  item_ = item;
+
+  if (!item)
+    return;
+
+  item_->AddObserver(this);
+
+  SetTitle(item_->title());
+
+  // Only refresh the icon if it's different from the old one. This prevents
+  // flickering.
+  if (old_item == NULL ||
+      !item->icon().BackedBySameObjectAs(old_item->icon())) {
+    OnIconChanged();
+  }
+}
+
+void SearchResultTileItemView::ButtonPressed(views::Button* sender,
+                                             const ui::Event& event) {
+  item_->Open(event.flags());
+}
+
+void SearchResultTileItemView::OnIconChanged() {
+  SetIcon(item_->icon());
+}
+
+void SearchResultTileItemView::OnResultDestroying() {
+  if (item_)
+    item_->RemoveObserver(this);
+  item_ = NULL;
+}
+
+}  // namespace app_list