/**
* 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.selection.content;
import org.waveprotocol.wave.client.editor.content.ContentElement;
import org.waveprotocol.wave.client.editor.content.ContentNode;
import org.waveprotocol.wave.client.editor.content.ContentTextNode;
import org.waveprotocol.wave.model.document.ReadableDocument;
import org.waveprotocol.wave.model.document.util.FocusedPointRange;
import org.waveprotocol.wave.model.document.util.Point;
import org.waveprotocol.wave.model.document.util.TextLocator;
/**
* Implementation of CaretMovement that manually traverses the document.
*
* TODO(user): Add an IE specific implementation that uses native methods.
*
*/
public final class CaretMovementHelperImpl implements CaretMovementHelper {
// We use the persistent view here rather than renderedView because
// the word boundary detection code works on contiguous text nodes. We want to
// ignore rendered nodes such as formatting.
private final ReadableDocument<ContentNode, ContentElement, ContentTextNode> persistentView;
private final SelectionHelper selectionHelper;
public CaretMovementHelperImpl(
ReadableDocument<ContentNode, ContentElement, ContentTextNode> persistentView,
SelectionHelper selectionHelper) {
this.persistentView = persistentView;
this.selectionHelper = selectionHelper;
}
@Override
public Point<ContentNode> getWordBoundary(boolean forward) {
FocusedPointRange<ContentNode> range = selectionHelper.getSelectionPoints();
if (range == null) {
return null;
}
return TextLocator.getWordBoundary(range.getFocus(), persistentView, forward);
}
}