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engines/pegasus/notification.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "pegasus/constants.h"
+#include "pegasus/notification.h"
+
+namespace Pegasus {
+
+typedef ReceiverList::iterator ReceiverIterator;
+
+Notification::Notification(const NotificationID id, NotificationManager *owner) : IDObject(id) {
+	_owner = owner;
+	_currentFlags = kNoNotificationFlags;
+	if (_owner)
+		_owner->addNotification(this);
+}
+
+Notification::~Notification() {
+	for (uint i = 0; i < _receivers.size(); i++)
+		_receivers[i].receiver->newNotification(nullptr);
+
+	if (_owner)
+		_owner->removeNotification(this);
+}
+
+// Selectively set or clear notificiation bits.
+// Wherever mask is 0, leave existing bits untouched.
+// Wherever mask is 1, set bit equivalent to flags.
+void Notification::notifyMe(NotificationReceiver *receiver, NotificationFlags flags, NotificationFlags mask) {
+	for (uint i = 0; i < _receivers.size(); i++) {
+		if (_receivers[i].receiver == receiver) {
+			_receivers[i].mask = (_receivers[i].mask & ~mask) | (flags & mask);
+			receiver->newNotification(this);
+			return;
+		}
+	}
+
+	ReceiverEntry newEntry;
+	newEntry.receiver = receiver;
+	newEntry.mask = flags;
+	_receivers.push_back(newEntry);
+
+	receiver->newNotification(this);
+}
+
+void Notification::cancelNotification(NotificationReceiver *receiver) {
+	for (uint i = 0; i < _receivers.size(); i++) {
+		if (_receivers[i].receiver == receiver) {
+			_receivers.remove_at(i);
+			i--;
+		}
+	}
+}
+
+void Notification::setNotificationFlags(NotificationFlags flags, NotificationFlags mask) {
+	_currentFlags = (_currentFlags & ~mask) | flags;
+}
+
+void Notification::checkReceivers() {
+	NotificationFlags currentFlags = _currentFlags;
+	_currentFlags = kNoNotificationFlags;
+
+	for (uint i = 0; i < _receivers.size(); i++)
+		if (_receivers[i].mask & currentFlags)
+			_receivers[i].receiver->receiveNotification(this, currentFlags);
+}
+
+// Receiver entries are equal if their receivers are equal.
+
+int operator==(const ReceiverEntry &entry1, const ReceiverEntry &entry2) {
+	return	entry1.receiver == entry2.receiver;
+}
+
+int operator!=(const ReceiverEntry &entry1, const ReceiverEntry &entry2) {
+	return	entry1.receiver != entry2.receiver;
+}
+
+NotificationReceiver::NotificationReceiver() {
+	_notification = nullptr;
+}
+
+NotificationReceiver::~NotificationReceiver() {
+	if (_notification)
+		_notification->cancelNotification(this);
+}
+
+void NotificationReceiver::receiveNotification(Notification *, const NotificationFlags) {
+}
+
+void NotificationReceiver::newNotification(Notification *notification) {
+	_notification = notification;
+}
+
+typedef NotificationList::iterator NotificationIterator;
+
+NotificationManager::NotificationManager() {
+}
+
+NotificationManager::~NotificationManager() {
+	detachNotifications();
+}
+
+void NotificationManager::addNotification(Notification *notification) {
+	_notifications.push_back(notification);
+}
+
+void NotificationManager::removeNotification(Notification *notification) {
+	for (NotificationIterator it = _notifications.begin(); it != _notifications.end();) {
+		if ((*it) == notification)
+			it = _notifications.erase(it);
+		else
+			it++;
+	}
+}
+
+void NotificationManager::detachNotifications() {
+	for (NotificationIterator it = _notifications.begin(); it != _notifications.end(); it++)
+		(*it)->_owner = nullptr;
+}
+
+void NotificationManager::checkNotifications() {
+	for (NotificationIterator it = _notifications.begin(); it != _notifications.end(); it++)
+		if ((*it)->_currentFlags != kNoNotificationFlags)
+			(*it)->checkReceivers();
+}
+
+} // End of namespace Pegasus