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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_BLOCKER_H_
#define CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_BLOCKER_H_
#include "base/observer_list.h"
namespace message_center {
class Notification;
} // namespace message_center
// Represents a notification blocker that prevents notifications from being
// displayed during certain times. These blockers work across all platforms and
// typically contain logic that the various OSs don't provide us with. The
// message center implementation for Chrome notifications has its own blockers
// which can be considered as separate OS level notification blockers like the
// ones that come with "Focus assist" on Windows.
class NotificationBlocker {
public:
class Observer : public base::CheckedObserver {
public:
// Called when the blocking state of this blocker has changed.
virtual void OnBlockingStateChanged() = 0;
};
NotificationBlocker();
NotificationBlocker(const NotificationBlocker&) = delete;
NotificationBlocker& operator=(const NotificationBlocker&) = delete;
virtual ~NotificationBlocker();
// Implementations should return true if this blocker wants to block
// |notification| right now.
virtual bool ShouldBlockNotification(
const message_center::Notification& notification) = 0;
// Called when |notification| got blocked because this blocker is active.
// |replaced| is true if the |notification| replaces a previously blocked one.
virtual void OnBlockedNotification(
const message_center::Notification& notification,
bool replaced) {}
// Called when a previously blocked |notification| got closed.
virtual void OnClosedNotification(
const message_center::Notification& notification) {}
// Observer methods.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
protected:
// Implementations should call this whenever their blocking state changes.
void NotifyBlockingStateChanged();
private:
base::ObserverList<Observer> observers_;
};
#endif // CHROME_BROWSER_NOTIFICATIONS_NOTIFICATION_BLOCKER_H_
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