/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.waveprotocol.wave.client.editor.content.misc;
import org.waveprotocol.wave.client.editor.content.ContentElement;
import org.waveprotocol.wave.client.editor.content.ContentNode;
import org.waveprotocol.wave.model.document.util.Property;
/**
* Handler for nodes that listen to EditModeChange events.
*
*
*/
public class DisplayEditModeHandler {
/**
* Interface for listeners to edit mode change events.
*/
public interface EditModeListener {
void onEditModeChange(ContentElement element, boolean isEditing);
}
public static final Property<EditModeListener> EDIT_MODE_LISTENER_PROP =
Property.immutable("display_edit_mode");
private DisplayEditModeHandler() {
}
/**
* Notify the node that the edit mode has changed.
* @param node
* @param isEditing
*/
public static void onEditModeChange(ContentNode node, boolean isEditing) {
EditModeListener listener = getListener(node);
if (node.asElement() != null && listener != null) {
listener.onEditModeChange(node.asElement(), isEditing);
}
}
/**
* Returns true iff the given node has an edit mode listener.
* @param node
*/
public static boolean hasListener(ContentNode node) {
return getListener(node) != null;
}
private static EditModeListener getListener(ContentNode node) {
ContentElement e = node.asElement();
return e.asElement() != null ? e.getProperty(EDIT_MODE_LISTENER_PROP) : null;
}
/**
* Sets an EditModeChange listener on this node.
* @param element
* @param listener
*/
public static void setEditModeListener(ContentElement element, EditModeListener listener) {
element.setProperty(EDIT_MODE_LISTENER_PROP, listener);
}
}