123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164 |
- /*
- * 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.fo.FObj;
- import org.apache.fop.fo.PropertyList;
- import org.apache.fop.fo.expr.PropertyException;
-
- /**
- * Maker class for handling corresponding properties.
- */
- public class CorrespondingPropertyMaker {
- /** base property maker */
- protected PropertyMaker baseMaker;
- /** corresponding property for lr-tb writing mode */
- protected int lrtb;
- /** corresponding property for rl-tb writing mode */
- protected int rltb;
- /** corresponding property for tb-rl writing mode */
- protected int tbrl;
- /** corresponding property for tb-lr writing mode */
- protected int tblr;
- /** user parent property list */
- protected boolean useParent;
- private boolean relative;
-
- /**
- * Construct a corresponding property maker.
- * @param baseMaker the base property maker
- */
- public CorrespondingPropertyMaker(PropertyMaker baseMaker) {
- this.baseMaker = baseMaker;
- baseMaker.setCorresponding(this);
- }
-
- /**
- * Set corresponding property values.
- * @param lrtb a corresponding value
- * @param rltb a corresponding value
- * @param tbrl a corresponding value
- * @param tblr a corresponding value
- */
-
- /**
- * Set corresponding property identifiers.
- * @param lrtb the property that corresponds with lr-tb writing mode
- * @param rltb the property that corresponds with rl-tb writing mode
- * @param tbrl the property that corresponds with tb-lr writing mode
- * @param tblr the property that corresponds with tb-lr writing mode
- */
- public void setCorresponding(int lrtb, int rltb, int tbrl, int tblr) {
- this.lrtb = lrtb;
- this.rltb = rltb;
- this.tbrl = tbrl;
- this.tblr = tblr;
- }
-
- /**
- * Controls whether the PropertyMaker accesses the parent property list or the current
- * property list for determining the writing mode.
- * @param useParent true if the parent property list should be used.
- */
- public void setUseParent(boolean useParent) {
- this.useParent = useParent;
- }
-
- /**
- * Set relative flag.
- * @param relative true if properties operate on a relative direction
- */
- public void setRelative(boolean relative) {
- this.relative = relative;
- }
-
- /**
- * For properties that operate on a relative direction (before, after,
- * start, end) instead of an absolute direction (top, bottom, left,
- * right), this method determines whether a corresponding property
- * is specified on the corresponding absolute direction. For example,
- * the border-start-color property in a lr-tb writing-mode specifies
- * the same thing that the border-left-color property specifies. In this
- * example, if the Maker for the border-start-color property is testing,
- * and if the border-left-color is specified in the properties,
- * this method should return true.
- * @param propertyList collection of properties to be tested
- * @return true iff 1) the property operates on a relative direction,
- * AND 2) the property has a corresponding property on an absolute
- * direction, AND 3) the corresponding property on that absolute
- * direction has been specified in the input properties
- */
- public boolean isCorrespondingForced(PropertyList propertyList) {
-
- if (!relative) {
- return false;
- }
-
- PropertyList pList = getWMPropertyList(propertyList);
- if (pList != null) {
- int correspondingId = pList.selectFromWritingMode(lrtb, rltb, tbrl, tblr);
-
- if (pList.getExplicit(correspondingId) != null) {
- return true;
- }
- }
- return false;
- }
-
- /**
- * Return a Property object representing the value of this property,
- * based on other property values for this FO.
- * A special case is properties which inherit the specified value,
- * rather than the computed value.
- * @param propertyList The PropertyList for the FO.
- * @return Property A computed Property value or null if no rules
- * are specified (in foproperties.xml) to compute the value.
- * @throws PropertyException if a property exception occurs
- */
- public Property compute(PropertyList propertyList) throws PropertyException {
- PropertyList pList = getWMPropertyList(propertyList);
- if (pList == null) {
- return null;
- }
- int correspondingId = pList.selectFromWritingMode(lrtb, rltb, tbrl, tblr);
-
- Property p = propertyList.getExplicitOrShorthand(correspondingId);
- if (p != null) {
- FObj parentFO = propertyList.getParentFObj();
- p = baseMaker.convertProperty(p, propertyList, parentFO);
- }
- return p;
- }
-
- /**
- * Return the property list to use for fetching writing mode depending property
- * ids.
- * @param pList a property list
- * @return the property list to use
- */
- protected PropertyList getWMPropertyList(PropertyList pList) {
- if (useParent) {
- return pList.getParentPropertyList();
- } else {
- return pList;
- }
- }
- }
|