Draggable peeking/fullscreen launcher with transparent background.

ui/app_list/views/contents_view.cc

 // Copyright (c) 2012 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/contents_view.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/logging.h"
@@ skipping 42 matching lines @@
   }
 
  private:
   views::View* const search_results_page_view_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchAnswerContainerView);
 };
 
 }  // namespace
 
-ContentsView::ContentsView(AppListMainView* app_list_main_view)
+ContentsView::ContentsView(AppListMainView* app_list_main_view,
+                           AppListView* app_list_view)
     : model_(nullptr),
       apps_container_view_(nullptr),
       search_results_page_view_(nullptr),
       start_page_view_(nullptr),
       custom_page_view_(nullptr),
       search_answer_container_view_(nullptr),
       app_list_main_view_(app_list_main_view),
+      app_list_view_(app_list_view),
       page_before_search_(0) {
   pagination_model_.SetTransitionDurations(kPageTransitionDurationInMs,
                                            kOverscrollPageTransitionDurationMs);
   pagination_model_.AddObserver(this);
 }
 
 ContentsView::~ContentsView() {
   pagination_model_.RemoveObserver(this);
   if (model_)
     model_->RemoveObserver(this);
@@ skipping 10 matching lines @@
   // Only add the first custom page view as STATE_CUSTOM_LAUNCHER_PAGE. Ignore
   // any subsequent custom pages.
   if (!custom_page_views.empty()) {
     custom_page_view_ = new CustomLauncherPageView(custom_page_views[0]);
 
     AddLauncherPage(custom_page_view_,
                     AppListModel::STATE_CUSTOM_LAUNCHER_PAGE);
   }
 
   // Start page.
-  start_page_view_ = new StartPageView(app_list_main_view_, view_delegate);
+  start_page_view_ =
+      new StartPageView(app_list_main_view_, view_delegate, app_list_view_);
   AddLauncherPage(start_page_view_, AppListModel::STATE_START);
 
   // Search results UI.
   search_results_page_view_ = new SearchResultPageView();
 
   // Search answer container UI.
   search_answer_container_view_ =
       new SearchAnswerContainerView(search_results_page_view_);
   search_answer_container_view_->SetVisible(false);
   views::View* search_answer_view = view_delegate->GetSearchAnswerWebView();
@@ skipping 414 matching lines @@
 
 void ContentsView::OnSearchAnswerAvailableChanged(bool has_answer) {
   if (has_answer == search_answer_container_view_->visible())
     return;
 
   search_answer_container_view_->SetVisible(has_answer);
   search_results_page_view_->Layout();
 }
 
 }  // namespace app_list