org.opencms.gwt.client.ui.CmsNotification Maven / Gradle / Ivy
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/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (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 com.google.gwt.core.client.Scheduler;
import com.google.gwt.core.client.Scheduler.ScheduledCommand;
/**
* User feedback provider.
*
* @since 8.0.0
*/
public final class CmsNotification {
/**
* Notification Mode.
*/
public static enum Mode {
/** 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;
/**
* Hide constructor.
*/
private CmsNotification() {
// empty
}
/**
* Returns the singleton instance.
*
* @return the singleton instance
*/
public static CmsNotification get() {
if (INSTANCE == null) {
INSTANCE = new CmsNotification();
}
return INSTANCE;
}
/**
* Returns if the message of the old mode and type needs to be restored after a new message has been shown.
*
* @param oldMode the old mode
* @param newMode the new mode
* @param oldType the old type
* @param newType the new type
*
* @return true if the message needs to be restored
*/
public static boolean shouldRestoreMessage(Mode oldMode, Mode newMode, Type oldType, Type newType) {
// only sticky messages will be restored
if (!Mode.STICKY.equals(oldMode)) {
return false;
}
// if new mode is not sticky also, restore
if (!Mode.STICKY.equals(newMode)) {
return true;
}
// if new type is superior to the old one, don't restore
if (isSuperiorType(oldType, newType)) {
return false;
}
return true;
}
/**
* Checks if the new type is superior to the old type.
*
* @param oldType the old type
* @param newType the new type
*
* @return true if the new type is superior to the old type
*/
private static boolean isSuperiorType(Type oldType, Type newType) {
if (oldType == null) {
return true;
}
if (newType == null) {
return false;
}
// do not overwrite a higher or equal level notification
switch (newType) {
case ERROR:
return !oldType.equals(Type.ERROR);
case NORMAL:
return false;
case WARNING:
return oldType.equals(Type.NORMAL);
default:
}
return true;
}
/**
* 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;
}
/**
* Hides the notification message.
*/
public void hide() {
if (m_widget != null) {
m_widget.hide();
}
}
/**
* Sends a new notification.
*
* @param type the notification type
* @param message the message
*/
public void send(Type type, final String message) {
if (m_widget != null) {
m_widget.show(Mode.NORMAL, type, message);
}
}
/**
* Sends a new blocking notification.
*
* @param type the notification type
* @param message the message
*/
public void sendBlocking(Type type, final String message) {
sendSticky(type, message);
if (m_widget != null) {
m_widget.setBlocking();
}
}
/**
* 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.
*
* @param type the notification type
* @param message the message
*/
public void sendSticky(Type type, final String message) {
if (m_widget != null) {
m_widget.show(Mode.STICKY, type, message);
}
}
/**
* Sets the widget.
*
* @param widget the widget to set
*/
public void setWidget(I_CmsNotificationWidget widget) {
m_widget = widget;
}
}