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// 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 <stddef.h>
#include <memory>
#include <string>
#include "base/macros.h"
#include "ui/message_center/message_center_export.h"
#include "ui/message_center/message_center_types.h"
#include "ui/message_center/notification_list.h"
class DownloadNotification;
class DownloadNotificationTestBase;
// Interface to manage the NotificationList. The client (e.g. Chrome) calls
// [Add|Remove|Update]Notification to create and update notifications in the
// list. It also sends those changes to its observers when a notification
// is shown, closed, or clicked on.
// MessageCenter is agnostic of profiles; it uses the string returned by
// Notification::id() to uniquely identify a notification. It is
// the caller's responsibility to formulate the id so that 2 different
// notification should have different ids. For example, if the caller supports
// multiple profiles, then caller should encode both profile characteristics and
// notification front end's notification id into a new id and set it into the
// notification instance before passing that in. Consequently the id passed to
// observers will be this unique id, which can be used with MessageCenter
// interface but probably not higher level interfaces.
namespace message_center {
namespace test {
class MessagePopupCollectionTest;
class LockScreenController;
class MessageCenterObserver;
class MessageCenterImplTest;
class NotificationBlocker;
class MESSAGE_CENTER_EXPORT MessageCenter {
enum class RemoveType {
// Remove all notifications.
// Remove non-pinned notification (don't remove invisible ones).
// Creates the global message center object with default LockScreenController.
static void Initialize();
// Creates the global message center object with custom LockScreenController.
static void Initialize(std::unique_ptr<LockScreenController> controller);
// Returns the global message center object. Returns null if Initialize is
// not called.
static MessageCenter* Get();
// Destroys the global message_center object.
static void Shutdown();
// Management of the observer list.
virtual void AddObserver(MessageCenterObserver* observer) = 0;
virtual void RemoveObserver(MessageCenterObserver* observer) = 0;
// Queries of current notification list status.
virtual size_t NotificationCount() const = 0;
virtual bool HasPopupNotifications() const = 0;
virtual bool IsQuietMode() const = 0;
// Returns true if chrome vox spoken feedback is enabled.
virtual bool IsSpokenFeedbackEnabled() const = 0;
// Find the notification with the corresponding id. Returns null if not
// found. The returned instance is owned by the message center.
virtual Notification* FindVisibleNotificationById(const std::string& id) = 0;
// Find all notifications with the corresponding |app_id|. Returns an
// empty set if none are found.
virtual NotificationList::Notifications FindNotificationsByAppId(
const std::string& app_id) = 0;
// Gets all notifications the message center knows about. These might contain
// currently hidden ones due to any active NotificationBlockers.
virtual NotificationList::Notifications GetNotifications() = 0;
// Gets all notifications to be shown to the user in the message center. Note
// that queued changes due to the message center being open are not reflected
// in this list.
virtual const NotificationList::Notifications& GetVisibleNotifications() = 0;
// Gets all notifications being shown as popups. This should not be affected
// by the change queue since notifications are not held up while the state is
virtual NotificationList::PopupNotifications GetPopupNotifications() = 0;
// Management of NotificationBlockers.
virtual void AddNotificationBlocker(NotificationBlocker* blocker) = 0;
virtual void RemoveNotificationBlocker(NotificationBlocker* blocker) = 0;
// Basic operations of notification: add/remove/update.
// Adds a new notification.
virtual void AddNotification(std::unique_ptr<Notification> notification) = 0;
// Updates an existing notification with id = old_id and set its id to new_id.
virtual void UpdateNotification(
const std::string& old_id,
std::unique_ptr<Notification> new_notification) = 0;
// Removes an existing notification.
virtual void RemoveNotification(const std::string& id, bool by_user) = 0;
virtual void RemoveNotificationsForNotifierId(
const NotifierId& notifier_id) = 0;
virtual void RemoveAllNotifications(bool by_user, RemoveType type) = 0;
// Sets the icon image. Icon appears at the top-left of the notification.
virtual void SetNotificationIcon(const std::string& notification_id,
const gfx::Image& image) = 0;
// Sets the large image for the notifications of type == TYPE_IMAGE. Specified
// image will appear below of the notification.
virtual void SetNotificationImage(const std::string& notification_id,
const gfx::Image& image) = 0;
// This should be called by UI classes when a notification is clicked to
// trigger the notification's delegate callback and also update the message
// center observers.
virtual void ClickOnNotification(const std::string& id) = 0;
// This should be called by UI classes when a notification button is clicked
// to trigger the notification's delegate callback and also update the message
// center observers.
virtual void ClickOnNotificationButton(const std::string& id,
int button_index) = 0;
// This should be called by UI classes when a notification button with an
// input is clicked to trigger the notification's delegate callback and also
// update the message center observers.
virtual void ClickOnNotificationButtonWithReply(
const std::string& id,
int button_index,
const base::string16& reply) = 0;
// Called by the UI classes when the settings buttons is clicked
// to trigger the notification's delegate and update the message
// center observers.
virtual void ClickOnSettingsButton(const std::string& id) = 0;
// This should be called by UI classes when a user select from notification
// inline settings to disable notifications from the same origin of the
// notification.
virtual void DisableNotification(const std::string& id) = 0;
// This should be called by UI classes after a visible notification popup
// closes, indicating that the notification has been shown to the user.
// |mark_notification_as_read|, if false, will unset the read bit on a
// notification, increasing the unread count of the center.
virtual void MarkSinglePopupAsShown(const std::string& id,
bool mark_notification_as_read) = 0;
// This should be called by UI classes when a notification is first displayed
// to the user, in order to decrement the unread_count for the tray, and to
// notify observers that the notification is visible.
virtual void DisplayedNotification(
const std::string& id,
const DisplaySource source) = 0;
// This can be called to change the quiet mode state (without a timeout).
virtual void SetQuietMode(bool in_quiet_mode) = 0;
// Used to set the spoken feedback state.
virtual void SetSpokenFeedbackEnabled(bool enabled) = 0;
// Temporarily enables quiet mode for |expires_in| time.
virtual void EnterQuietModeWithExpire(const base::TimeDelta& expires_in) = 0;
// Informs the notification list whether the message center is visible.
// This affects whether or not a message has been "read".
virtual void SetVisibility(Visibility visible) = 0;
// Allows querying the visibility of the center.
virtual bool IsMessageCenterVisible() const = 0;
// Informs the MessageCenter whether there's a bubble anchored to a system
// tray which holds notifications. If false, only toasts are shown (e.g. on
// desktop Linux and Windows). When there's no message center view, updated
// notifications will be re-appear as toasts even if they've already been
// shown.
virtual void SetHasMessageCenterView(bool has_message_center_view) = 0;
virtual bool HasMessageCenterView() const = 0;
// UI classes should call this when there is cause to leave popups visible for
// longer than the default (for example, when the mouse hovers over a popup).
virtual void PausePopupTimers() = 0;
// UI classes should call this when the popup timers should restart (for
// example, after the mouse leaves the popup.)
virtual void RestartPopupTimers() = 0;
// The user-visible "app name" for system-generated notifications, which is
// used to identify the application that generated a notification. Only used
// for MD style notifications, which means that currently it's only set and
// used on Chrome OS. On Chrome OS, this is "Chrome OS".
virtual const base::string16& GetSystemNotificationAppName() const = 0;
virtual void SetSystemNotificationAppName(const base::string16& name) = 0;
friend class ::DownloadNotification;
friend class ::DownloadNotificationTestBase;
friend class MessageCenterImplTest;
friend class MessageCenterImplTestWithChangeQueue;
friend class MessageCenterImplTestWithoutChangeQueue;
friend class UiControllerTest;
friend class TrayViewControllerTest;
friend class MessagePopupCollectionTest;
virtual void DisableTimersForTest() = 0;
virtual ~MessageCenter();
} // namespace message_center