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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.fo.properties;
-
- import org.apache.fop.datatypes.Numeric;
- import org.apache.fop.fo.FONode;
- import org.apache.fop.fo.FObj;
- import org.apache.fop.fo.PropertyList;
- import org.apache.fop.fo.expr.NumericOp;
- import org.apache.fop.fo.expr.PropertyException;
-
- /**
- * This property maker handles the calculations described in 5.3.2 which
- * involves the sizes of the corresponding margin-* properties and the
- * padding-* and border-*-width properties.
- */
- public class IndentPropertyMaker extends CorrespondingPropertyMaker {
- /**
- * The corresponding padding-* propIds
- */
- private int[] paddingCorresponding = null;
-
- /**
- * The corresponding border-*-width propIds
- */
- private int[] borderWidthCorresponding = null;
-
- /**
- * Create a start-indent or end-indent property maker.
- * @param baseMaker the property maker to use
- */
- public IndentPropertyMaker(PropertyMaker baseMaker) {
- super(baseMaker);
- }
-
- /**
- * Set the corresponding values for the padding-* properties.
- * @param paddingCorresponding the corresping propids.
- */
- public void setPaddingCorresponding(int[] paddingCorresponding) {
- this.paddingCorresponding = paddingCorresponding;
- }
-
- /**
- * Set the corresponding values for the border-*-width properties.
- * @param borderWidthCorresponding the corresping propids.
- */
- public void setBorderWidthCorresponding(int[] borderWidthCorresponding) {
- this.borderWidthCorresponding = borderWidthCorresponding;
- }
-
- /**
- * Calculate the corresponding value for start-indent and end-indent.
- * @see CorrespondingPropertyMaker#compute(PropertyList)
- */
- public Property compute(PropertyList propertyList) throws PropertyException {
- if (propertyList.getFObj().getUserAgent()
- .isBreakIndentInheritanceOnReferenceAreaBoundary()) {
- return computeAlternativeRuleset(propertyList);
- } else {
- return computeConforming(propertyList);
- }
- }
-
- /**
- * Calculate the corresponding value for start-indent and end-indent.
- * @see CorrespondingPropertyMaker#compute(PropertyList)
- */
- public Property computeConforming(PropertyList propertyList) throws PropertyException {
- PropertyList pList = getWMPropertyList(propertyList);
- if (pList == null) {
- return null;
- }
- // Calculate the values as described in 5.3.2.
-
- Numeric padding = getCorresponding(paddingCorresponding, propertyList).getNumeric();
- Numeric border = getCorresponding(borderWidthCorresponding, propertyList).getNumeric();
-
- int marginProp = pList.getWritingMode(lr_tb, rl_tb, tb_rl);
- // Calculate the absolute margin.
- if (propertyList.getExplicitOrShorthand(marginProp) == null) {
- Property indent = propertyList.getExplicit(baseMaker.propId);
- if (indent == null) {
- //Neither indent nor margin is specified, use inherited
- return null;
- } else {
- //Use explicit indent directly
- return indent;
- }
- } else {
- //Margin is used
- Numeric margin = propertyList.get(marginProp).getNumeric();
-
- Numeric v = new FixedLength(0);
- if (!propertyList.getFObj().generatesReferenceAreas()) {
- // The inherited_value_of([start|end]-indent)
- v = NumericOp.addition(v, propertyList.getInherited(baseMaker.propId).getNumeric());
- }
- // The corresponding absolute margin-[right|left}.
- v = NumericOp.addition(v, margin);
- v = NumericOp.addition(v, padding);
- v = NumericOp.addition(v, border);
- return (Property) v;
- }
-
- }
-
- private boolean isInherited(PropertyList pList) {
- if (pList.getFObj().getUserAgent().isBreakIndentInheritanceOnReferenceAreaBoundary()) {
- FONode nd = pList.getFObj().getParent();
- return !((nd instanceof FObj) && ((FObj)nd).generatesReferenceAreas());
- } else {
- return true;
- }
- }
-
- /**
- * Calculate the corresponding value for start-indent and end-indent.
- * This method calculates indent following an alternative rule set that
- * tries to mimic many commercial solutions that chose to violate the
- * XSL specification.
- * @see CorrespondingPropertyMaker#compute(PropertyList)
- */
- public Property computeAlternativeRuleset(PropertyList propertyList) throws PropertyException {
- PropertyList pList = getWMPropertyList(propertyList);
- if (pList == null) {
- return null;
- }
-
- // Calculate the values as described in 5.3.2.
-
- Numeric padding = getCorresponding(paddingCorresponding, propertyList).getNumeric();
- Numeric border = getCorresponding(borderWidthCorresponding, propertyList).getNumeric();
-
- int marginProp = pList.getWritingMode(lr_tb, rl_tb, tb_rl);
-
- //Determine whether the nearest anscestor indent was specified through
- //start-indent|end-indent or through a margin property.
- boolean marginNearest = false;
- PropertyList pl = propertyList.getParentPropertyList();
- while (pl != null) {
- if (pl.getExplicit(baseMaker.propId) != null) {
- break;
- } else if (pl.getExplicitOrShorthand(marginProp) != null) {
- marginNearest = true;
- break;
- }
- pl = pl.getParentPropertyList();
- }
-
- // Calculate the absolute margin.
- if (propertyList.getExplicitOrShorthand(marginProp) == null) {
- Property indent = propertyList.getExplicit(baseMaker.propId);
- if (indent == null) {
- //Neither start-indent nor margin is specified, use inherited
- if (isInherited(propertyList) || !marginNearest) {
- return null;
- } else {
- return new FixedLength(0);
- }
- } else {
- return indent;
- }
- } else {
- //Margin is used
- Numeric margin = propertyList.get(marginProp).getNumeric();
-
- Numeric v = new FixedLength(0);
- if (isInherited(propertyList)) {
- // The inherited_value_of([start|end]-indent)
- v = NumericOp.addition(v, propertyList.getInherited(baseMaker.propId).getNumeric());
- }
- // The corresponding absolute margin-[right|left}.
- v = NumericOp.addition(v, margin);
- v = NumericOp.addition(v, padding);
- v = NumericOp.addition(v, border);
- return (Property) v;
- }
- }
-
- private Property getCorresponding(int[] corresponding, PropertyList propertyList)
- throws PropertyException {
- PropertyList pList = getWMPropertyList(propertyList);
- if (pList != null) {
- int wmcorr = pList.getWritingMode(corresponding[0], corresponding[1], corresponding[2]);
- return propertyList.get(wmcorr);
- } else {
- return null;
- }
- }
- }
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