Draggable peeking/fullscreen launcher with transparent background.

ash/app_list/app_list_delegate_impl.cc

-// Copyright 2017 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 "ash/app_list/app_list_delegate_impl.h"
-
-#include "ash/root_window_controller.h"
-#include "ash/shelf/app_list_button.h"
-#include "ash/shelf/shelf.h"
-#include "ash/shelf/shelf_widget.h"
-#include "ash/shell.h"
-#include "ash/shell_port.h"
-#include "ui/app_list/presenter/app_list.h"
-
-namespace ash {
-
-AppListDelegateImpl::AppListDelegateImpl() {
-  Shell::Get()->app_list()->set_delegate(this);
-}
-
-AppListDelegateImpl::~AppListDelegateImpl() {
-  Shell::Get()->app_list()->set_delegate(nullptr);
-}
-
-void AppListDelegateImpl::OnAppListVisibilityChanged(bool visible,
-                                                     int64_t display_id) {
-  aura::Window* root_window =
-      ShellPort::Get()->GetRootWindowForDisplayId(display_id);
-  AppListButton* app_list_button =
-      Shelf::ForWindow(root_window)->shelf_widget()->GetAppListButton();
-  if (!app_list_button)
-    return;
-
-  if (visible)
-    app_list_button->OnAppListShown();
-  else
-    app_list_button->OnAppListDismissed();
-}
-
-}  // namespace ash