Support notifications with custom content

ui/message_center/views/message_view_factory.cc

+// Copyright 2016 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_view_factory.h"
+
+#include "ui/message_center/notification_types.h"
+#include "ui/message_center/views/custom_notification_view.h"
+#include "ui/message_center/views/notification_view.h"
+
+#if defined(OS_WIN)
+#include "ui/base/win/shell.h"
+#endif
+
+namespace message_center {
+
+// static
+MessageView* MessageViewFactory::Create(MessageCenterController* controller,
+                                        const Notification& notification,
+                                        bool top_level) {
+  MessageView* notification_view = nullptr;
+  switch (notification.type()) {
+    case NOTIFICATION_TYPE_BASE_FORMAT:
+    case NOTIFICATION_TYPE_IMAGE:
+    case NOTIFICATION_TYPE_MULTIPLE:
+    case NOTIFICATION_TYPE_SIMPLE:
+    case NOTIFICATION_TYPE_PROGRESS:
+      // All above roads lead to the generic NotificationView.
+      notification_view = new NotificationView(controller, notification);
+      break;
+    case NOTIFICATION_TYPE_CUSTOM:
+      notification_view = new CustomNotificationView(controller, notification);
+      break;
+    default:
+      // If the caller asks for an unrecognized kind of view (entirely possible
+      // if an application is running on an older version of this code that
+      // doesn't have the requested kind of notification template), we'll fall
+      // back to a notification instance that will provide at least basic
+      // functionality.
+      LOG(WARNING) << "Unable to fulfill request for unrecognized "
+                   << "notification type " << notification.type() << ". "
+                   << "Falling back to simple notification type.";
+      notification_view = new NotificationView(controller, notification);
+  }
+
+#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
+  // Don't create shadows for notification toasts on linux wih aura.
+  if (top_level)
+    return notification_view;
+#endif
+
+#if defined(OS_WIN)
+  // Don't create shadows for notifications on Windows under classic theme.
+  if (top_level && !ui::win::IsAeroGlassEnabled()) {
+    return notification_view;
+  }
+#endif  // OS_WIN
+
+  notification_view->CreateShadowBorder();
+  return notification_view;
+}
+
+}  // namespace message_center