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/*
* 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.
*/
/* $Id$ */
package org.apache.fop.layoutmgr;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.fop.fo.FObj;
import org.apache.fop.fo.properties.CommonBorderPaddingBackground;
import org.apache.fop.traits.MinOptMax;
/**
* A block-stacking layout manager for an FO that supports spaces, border and padding.
*/
public abstract class SpacedBorderedPaddedBlockLayoutManager extends BlockStackingLayoutManager
implements ConditionalElementListener {
private static final Log LOG = LogFactory.getLog(BlockLayoutManager.class);
protected MinOptMax effSpaceBefore;
protected MinOptMax effSpaceAfter;
protected boolean discardBorderBefore;
protected boolean discardBorderAfter;
protected boolean discardPaddingBefore;
protected boolean discardPaddingAfter;
public SpacedBorderedPaddedBlockLayoutManager(FObj node) {
super(node);
}
public void notifySpace(RelSide side, MinOptMax effectiveLength) {
if (RelSide.BEFORE == side) {
if (LOG.isDebugEnabled()) {
LOG.debug(this + ": Space " + side + ", "
+ this.effSpaceBefore + "-> " + effectiveLength);
}
this.effSpaceBefore = effectiveLength;
} else {
if (LOG.isDebugEnabled()) {
LOG.debug(this + ": Space " + side + ", "
+ this.effSpaceAfter + "-> " + effectiveLength);
}
this.effSpaceAfter = effectiveLength;
}
}
public void notifyBorder(RelSide side, MinOptMax effectiveLength) {
if (effectiveLength == null) {
if (RelSide.BEFORE == side) {
this.discardBorderBefore = true;
} else {
this.discardBorderAfter = true;
}
}
if (LOG.isDebugEnabled()) {
LOG.debug(this + ": Border " + side + " -> " + effectiveLength);
}
}
public void notifyPadding(RelSide side, MinOptMax effectiveLength) {
if (effectiveLength == null) {
if (RelSide.BEFORE == side) {
this.discardPaddingBefore = true;
} else {
this.discardPaddingAfter = true;
}
}
if (LOG.isDebugEnabled()) {
LOG.debug(this + ": Padding " + side + " -> " + effectiveLength);
}
}
@Override
public int getBaselineOffset() {
int baselineOffset = super.getBaselineOffset();
if (effSpaceBefore != null) {
baselineOffset += effSpaceBefore.getOpt();
}
if (!discardBorderBefore) {
baselineOffset += getCommonBorderPaddingBackground().getBorderBeforeWidth(false);
}
if (!discardPaddingBefore) {
baselineOffset += getCommonBorderPaddingBackground().getPaddingBefore(false, this);
}
return baselineOffset;
}
/**
* Returns the {@link CommonBorderPaddingBackground} instance from the FO handled by this layout manager.
*/
protected abstract CommonBorderPaddingBackground getCommonBorderPaddingBackground();
}
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