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/*
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * For further information about Alkacon Software, please see the
 * company website: http://www.alkacon.com
 *
 * For further information about OpenCms, please see the
 * project website: http://www.opencms.org
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.opencms.gwt.client.ui;

import java.util.ArrayList;
import java.util.List;

import com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
import com.google.gwt.user.client.Timer;

/**
 * User feedback provider.

* * @since 8.0.0 */ public final class CmsNotification { /** * Notification Mode.

*/ public static enum Mode { /** Alert mode. */ BROADCAST, /** Blocking mode. */ BUSY, /** Normal mode. */ NORMAL, /** Sticky mode. */ STICKY; } /** * Notification Type.

*/ public static enum Type { /** Error Notification. */ ERROR, /** Normal Notification. */ NORMAL, /** Warning Notification. */ WARNING; } /** The duration of the animations. */ public static final int ANIMATION_DURATION = 200; /** The singleton instance. */ private static CmsNotification INSTANCE; /** The widget. */ private I_CmsNotificationWidget m_widget; /** The current notifications. */ private List m_messages; /** * Hide constructor.

*/ private CmsNotification() { m_messages = new ArrayList(); } /** * Returns the singleton instance.

* * @return the singleton instance */ public static CmsNotification get() { if (INSTANCE == null) { INSTANCE = new CmsNotification(); } return INSTANCE; } /** * Returns the widget.

* * @return the widget */ public I_CmsNotificationWidget getWidget() { return m_widget; } /** * Returns if the notification widget is set. Only if the widget is set, notifications can be shown.

* * @return true if the notification widget is set */ public boolean hasWidget() { return m_widget != null; } /** * Removes the given notification message.

* * @param message the message to remove */ public void removeMessage(CmsNotificationMessage message) { m_messages.remove(message); if (hasWidget()) { m_widget.removeMessage(message); } } /** * Sends a new notification, that will be removed automatically.

* * @param type the notification type * @param message the message */ public void send(Type type, final String message) { final CmsNotificationMessage notificationMessage = new CmsNotificationMessage(Mode.NORMAL, type, message); m_messages.add(notificationMessage); if (hasWidget()) { m_widget.addMessage(notificationMessage); } Timer timer = new Timer() { @Override public void run() { removeMessage(notificationMessage); } }; timer.schedule(4000 * (type == Type.NORMAL ? 1 : 2)); } /** * Sends a new blocking alert notification that can be closed by the user.

* * @param type the notification type * @param message the message */ public void sendAlert(Type type, String message) { CmsNotificationMessage notificationMessage = new CmsNotificationMessage(Mode.BROADCAST, type, message); m_messages.add(notificationMessage); if (hasWidget()) { m_widget.addMessage(notificationMessage); } } /** * Sends a new blocking notification that can not be removed by the user.

* * @param type the notification type * @param message the message * * @return the message, use to hide the message */ public CmsNotificationMessage sendBusy(Type type, final String message) { CmsNotificationMessage notificationMessage = new CmsNotificationMessage(Mode.BUSY, type, message); m_messages.add(notificationMessage); if (hasWidget()) { m_widget.addMessage(notificationMessage); } return notificationMessage; } /** * Sends a new notification after all other events have been processed.

* * @param type the notification type * @param message the message */ public void sendDeferred(final Type type, final String message) { Scheduler.get().scheduleDeferred(new ScheduledCommand() { /** * @see com.google.gwt.core.client.Scheduler.ScheduledCommand#execute() */ public void execute() { send(type, message); } }); } /** * Sends a new sticky notification that can not be removed by the user.

* * @param type the notification type * @param message the message * * @return the message, use to hide the message */ public CmsNotificationMessage sendSticky(Type type, String message) { CmsNotificationMessage notificationMessage = new CmsNotificationMessage(Mode.STICKY, type, message); m_messages.add(notificationMessage); if (hasWidget()) { m_widget.addMessage(notificationMessage); } return notificationMessage; } /** * Sets the widget.

* * @param widget the widget to set */ public void setWidget(I_CmsNotificationWidget widget) { if (m_widget != null) { m_widget.clearMessages(); } m_widget = widget; m_widget.clearMessages(); for (CmsNotificationMessage message : m_messages) { m_widget.addMessage(message); } } }





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