Adjust behavior of control buttons of notifications.

ui/message_center/views/message_center_view.cc

 // Copyright (c) 2013 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/message_center/views/message_center_view.h"
 
 #include <list>
 #include <map>
 
 #include "base/macros.h"
@@ skipping 59 matching lines @@
       button_bar_(NULL),
       settings_visible_(initially_settings_visible),
       source_view_(NULL),
       source_height_(0),
       target_view_(NULL),
       target_height_(0),
       is_closing_(false),
       is_locked_(message_center_->IsLockedState()),
       mode_((!initially_settings_visible || is_locked_) ? Mode::BUTTONS_ONLY
                                                         : Mode::SETTINGS),
-      context_menu_controller_(new MessageViewContextMenuController(this)) {
+      context_menu_controller_(new MessageViewContextMenuController(this)),
+      focus_manager_(nullptr) {
   message_center_->AddObserver(this);
   set_notify_enter_exit_on_child(true);
   set_background(views::Background::CreateSolidBackground(
       kMessageCenterBackgroundColor));
 
   NotifierSettingsProvider* notifier_settings_provider =
       message_center_->GetNotifierSettingsProvider();
   button_bar_ = new MessageCenterButtonBar(
       this, message_center, notifier_settings_provider,
       initially_settings_visible, GetButtonBarTitle());
@@ skipping 35 matching lines @@
   AddChildView(scroller_);
   AddChildView(settings_view_);
   AddChildView(button_bar_);
 }
 
 MessageCenterView::~MessageCenterView() {
   message_list_view_->RemoveObserver(this);
 
   if (!is_closing_)
     message_center_->RemoveObserver(this);
+
+  if (focus_manager_)
+    focus_manager_->RemoveFocusChangeListener(this);
+}
+
+void MessageCenterView::Init() {
+  focus_manager_ = GetFocusManager();
+  if (focus_manager_)
+    focus_manager_->AddFocusChangeListener(this);
 }
 
 void MessageCenterView::SetNotifications(
     const NotificationList::Notifications& notifications)  {
   if (is_closing_)
     return;
 
   notification_views_.clear();
 
   int index = 0;
@@ skipping 51 matching lines @@
 }
 
 void MessageCenterView::SetIsClosing(bool is_closing) {
   is_closing_ = is_closing;
   if (is_closing)
     message_center_->RemoveObserver(this);
   else
     message_center_->AddObserver(this);
 }
 
+void MessageCenterView::OnDidChangeFocus(views::View* before,
+                                         views::View* now) {
+  if (message_list_view_ && (message_list_view_->Contains(before) ||
+                             message_list_view_->Contains(now))) {
+    // Focus state of a children of message view center is changed.
+    for (auto pair : notification_views_) {
+      if (pair.second->Contains(before) || pair.second->Contains(now))
+        pair.second->UpdateControlButtonsVisibility();
+    }
+  }
+}
+
 void MessageCenterView::Layout() {
   if (is_closing_)
     return;
 
   int button_height = button_bar_->GetHeightForWidth(width()) +
                       button_bar_->GetInsets().height();
   // Skip unnecessary re-layout of contents during the resize animation.
   bool animating = settings_transition_animation_ &&
                    settings_transition_animation_->is_animating();
   if (animating && settings_transition_animation_->current_part_index() == 0) {
@@ skipping 426 matching lines @@
     // Disable the close-all button since no notification is visible.
     button_bar_->SetCloseAllButtonEnabled(false);
   }
 }
 
 void MessageCenterView::SetNotificationViewForTest(MessageView* view) {
   message_list_view_->AddNotificationAt(view, 0);
 }
 
 }  // namespace message_center