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// Copyright 2018 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/ash_export.h"
#include "base/observer_list.h"
#include "chromeos/dbus/power_manager_client.h"
namespace ash {
// Model class that stores UnifiedSystemTray's UI specific variables. Owned by
// UnifiedSystemTray status area button. Not to be confused with UI agnostic
// SystemTrayModel.
class ASH_EXPORT UnifiedSystemTrayModel {
enum class NotificationTargetMode {
// Notification list scrolls to the last notification.
// Notification list scrolls to the last scroll position.
// Notification list scrolls to the specified notification defined by
// |SetTargetNotification(notification_id)|.
class Observer {
virtual ~Observer() {}
// |by_user| is true when brightness is changed by user action.
virtual void OnDisplayBrightnessChanged(bool by_user) {}
virtual void OnKeyboardBrightnessChanged(bool by_user) {}
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
bool IsExpandedOnOpen() const;
// Returns empty if it's not manually expanded/collapsed. Otherwise, the value
// is true if the notification is manually expanded, and false if it's
// manually collapsed.
base::Optional<bool> GetNotificationExpanded(
const std::string& notification_id) const;
// Sets a notification of |notification_id| is manually |expanded|.
void SetNotificationExpanded(const std::string& notification_id,
bool expanded);
// Removes the state of the notification of |notification_id|.
void RemoveNotificationExpanded(const std::string& notification_id);
// Clears all changes by SetNotificatinExpanded().
void ClearNotificationChanges();
// Set the notification id of the target. This sets target mode as
void SetTargetNotification(const std::string& notification_id);
float display_brightness() const { return display_brightness_; }
float keyboard_brightness() const { return keyboard_brightness_; }
void set_expanded_on_open(bool expanded_on_open) {
expanded_on_open_ = expanded_on_open;
void set_notification_target_mode(NotificationTargetMode mode) {
notification_target_mode_ = mode;
NotificationTargetMode notification_target_mode() const {
return notification_target_mode_;
const std::string& notification_target_id() const {
return notification_target_id_;
class DBusObserver;
void DisplayBrightnessChanged(float brightness, bool by_user);
void KeyboardBrightnessChanged(float brightness, bool by_user);
// Target mode which is used to decide the scroll position of the message
// center on opening. See the comment in |NotificationTargetMode|.
NotificationTargetMode notification_target_mode_ =
// Set the notification id of the target. This id is used if the target mode
std::string notification_target_id_;
// If UnifiedSystemTray bubble is expanded on its open. It's expanded by
// default, and if a user collapses manually, it remembers previous state.
bool expanded_on_open_ = true;
// The last value of the display brightness slider. Between 0.0 and 1.0.
float display_brightness_ = 1.f;
// The last value of the keyboard brightness slider. Between 0.0 and 1.0.
float keyboard_brightness_ = 1.f;
// Stores Manual changes to notification expanded / collapsed state in order
// to restore on reopen.
// <notification ID, if notification is manually expanded>
std::map<std::string, bool> notification_changes_;
std::unique_ptr<DBusObserver> dbus_observer_;
base::ObserverList<Observer>::Unchecked observers_;
} // namespace ash