/**
* Copyright 2009 Google Inc.
*
* Licensed 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.model.document.util;
import org.waveprotocol.wave.model.document.raw.RawDocument;
/**
* Extension to persistent content that is aware of the need to repaint new
* text nodes and provides the logic to do so.
*
* @author danilatos@google.com (Daniel Danilatos)
*/
public abstract class RepaintingPersistentContent<N, E extends N, T extends N>
extends PersistentContent<N, E, T> {
private final RawDocument<N, E, T> fullDoc;
/**
* @see PersistentContent#PersistentContent(RawDocument, ElementManager)
*/
public RepaintingPersistentContent(RawDocument<N, E, T> fullDoc,
ElementManager<E> elementManager) {
super(fullDoc, elementManager);
this.fullDoc = fullDoc;
}
// We override create text node and insertData to schedule annotation repaints.
// New text nodes obviously need it, for example after starting a new paragraph
// that is styled according to the data structure, but there is no paint node
// around. Insert data at position zero is also needed, as we sometimes need to
// *remove* styling from an already styled node, e.g. if it's at the start of
// a paragraph at an annotation boundary.
@Override
public T createTextNode(String data,
E parent, N nodeAfter) {
final T textNode = super.createTextNode(data, parent, nodeAfter);
schedulePaint(textNode);
return textNode;
}
@Override
public void insertData(T textNode, int offset, String arg) {
super.insertData(textNode, offset, arg);
if (offset == 0) {
schedulePaint(textNode);
}
}
@Override
public void removeChild(E parent, N oldChild) {
// Schedule repaint for this node if emptied (The annotation painter
// may then remove the node, but not necessarily). We do this to clean
// up empty paint annotations after the contents have been removed.
E fullViewParent = fullDoc.getParentElement(oldChild);
super.removeChild(parent, oldChild);
if (fullDoc.getFirstChild(fullViewParent) == null) {
schedulePaint(fullViewParent);
}
}
/** Schedule a node for repainting with the annotation painter */
abstract protected void schedulePaint(N node) ;
}