/**
* 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.paragraph;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Node;
import org.waveprotocol.wave.client.editor.content.ContentElement;
import org.waveprotocol.wave.client.editor.content.ContentView;
/**
* Used for Gecko and Webkit
*
* Firefox, like Safari, uses a regular <br/> element as spacer.
*
* Firefox's native editor always preserves a br at the end of
* each line as a spacer.
*
* Safari's native editor removes the spacer br by default for
* non-empty lines, however this causes glitches. Given that it
* works just to manually force it to always keep the br, and
* that this fixes the glitches (to do with non-empty content
* that still collapses the paragraph, such as a nested empty
* span), we use this behaviour for Safari as well.
*
* Firefox's native editor:
*
* -- Adds the <br/> when creating new, empty paragraphs.
* -- Adds the <br/> when the user deletes the last char in the paragraph.
* -- Adds the <br/> when the user types a trailing space
* -- Removes the <br/> when the user hits return at the end of a
* non-empty paragraph
*
* but Firefox:
*
* -- Does *not* add the <br/> when we removeChild the last node from
* a paragraph.
* -- Does *not* add the <br/> when we createElement an empty paragraph
* and insert it into the editor.
* -- Does *not* add the <br> is we insert text with a trailing space into
* the end of the paragraph
*
* Our code inserts and moves spacer <br/> elements to always have the
* <br/> element at the end of the paragraph. (Note that we handle return
* ourselves, so Firefox does not get a chance to remove the <br/> on return.)
*
*/
public class ParagraphHelperAlwaysBr extends ParagraphHelperBr {
/**
* {@inheritDoc}
*/
@Override
public void onChildAdded(Node child, Element paragraph) {
appendSpacer(paragraph);
}
/**
* {@inheritDoc}
*/
@Override
public void onRemovingChild(Node child, Element paragraph) {
appendSpacer(paragraph);
}
/**
* {@inheritDoc}
*/
@Override
public void onRepair(ContentElement paragraph) {
appendSpacer(paragraph.getImplNodelet());
}
/**
* {@inheritDoc}
*/
@Override
public void assertHealthy(ContentElement paragraph) {
ContentView renderedContent = paragraph.getRenderedContentView();
if (renderedContent.getFirstChild(paragraph) != null) {
Element nodelet = paragraph.getImplNodelet();
Node last = nodelet.getLastChild();
assert isSpacer(last) : "Last nodelet child should be spacer";
Node child = nodelet.getFirstChild();
while (child != null && !child.equals(last)) {
assert !isSpacer(child) : "Only last nodelet child should be spacer";
child = child.getNextSibling();
}
}
super.assertHealthy(paragraph);
}
}