/*
* Copyright (C) 2015-2017 Emanuel Moecklin
*
* 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 com.onegravity.rteditor.spans;
/**
* Paragraph indentation.
* <p>
* Android seems to add the leading margin for an empty paragraph to the previous paragraph
* (]0, 4][4, 4] --> the leading margin of the second span is added to the ]0, 4] paragraph regardless of the Spanned.flags)
* --> therefore we ignore the leading margin for the last, empty paragraph unless it's the only one
*/
public class IndentationSpan extends android.text.style.LeadingMarginSpan.Standard implements RTSpan<Integer>, RTParagraphSpan<Integer> {
private final int mIndentation;
private final boolean mIgnoreSpan;
public IndentationSpan(int indentation, boolean isEmpty, boolean isFirst, boolean isLast) {
super(indentation);
mIndentation = indentation;
mIgnoreSpan = isEmpty && isLast && !isFirst;
}
private IndentationSpan(int indentation, boolean ignoreSpan) {
super(indentation);
mIndentation = indentation;
mIgnoreSpan = ignoreSpan;
}
@Override
public int getLeadingMargin(boolean first) {
return mIgnoreSpan ? 0 : mIndentation;
}
/**
* While the getLeadingMargin(boolean) is "officially" used when rendering the span
* this method returns the indentation regardless of whether we want to render it or not.
* Internally we always use this method.
*/
@Override
public Integer getValue() {
return mIndentation;
}
@Override
public IndentationSpan createClone() {
return new IndentationSpan(mIndentation, mIgnoreSpan);
}
}