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 "ash/wm_window.h"
+#include "ui/app_list/app_list_features.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)
+  if (visible) {
     app_list_button->OnAppListShown();
-  else
+    if (app_list::features::IsFullscreenAppListEnabled()) {
+      Shelf* shelf = Shelf::ForWindow(root_window);
+      shelf->OnAppListIsActive(true);

[vadimt, 2017/05/26 23:44:08]

This repeated part can be moved to after if.

[newcomer, 2017/05/30 21:37:03]

Done.

+    }
+  } else {
     app_list_button->OnAppListDismissed();
+    if (app_list::features::IsFullscreenAppListEnabled()) {
+      Shelf* shelf = Shelf::ForWindow(root_window);
+      shelf->OnAppListIsActive(true);

[xiyuan, 2017/05/30 16:32:33]

Should this be "false" ? We probably can use |visible| here.

[newcomer, 2017/05/30 21:37:03]

Correct, I noticed this too and It's fixed.

+    }
+  }
 }
 
 }  // namespace ash