| /* |
| * 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.Constants; |
| import org.apache.fop.fo.FObj; |
| import org.apache.fop.fo.PropertyList; |
| import org.apache.fop.fo.expr.PropertyException; |
| |
| /** |
| * This subclass of EnumProperty.Maker handles the special treatment of |
| * relative font stretch values described in 7.8.5. |
| */ |
| public class FontStretchPropertyMaker |
| extends EnumProperty.Maker implements Constants { |
| |
| /* Ordered list of absolute font stretch properties so we can easily find the next / |
| * previous one */ |
| private Property[] orderedFontStretchValues; |
| |
| /** |
| * Create an enum property which can handle relative font stretches |
| * @param propId the font size property id. |
| */ |
| public FontStretchPropertyMaker(int propId) { |
| super(propId); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * Implements the parts of 7.8.5 relevant to relative font stretches |
| */ |
| public Property convertProperty(Property p, |
| PropertyList propertyList, |
| FObj fo) throws PropertyException { |
| // if it is a relative font stretch value get current parent value and step |
| // up or down accordingly |
| if (p.getEnum() == EN_NARROWER) { |
| return computeNextAbsoluteFontStretch(propertyList.getFromParent(this.getPropId()), -1); |
| } else if (p.getEnum() == EN_WIDER) { |
| return computeNextAbsoluteFontStretch(propertyList.getFromParent(this.getPropId()), 1); |
| } |
| return super.convertProperty(p, propertyList, fo); |
| } |
| |
| /** |
| * Calculates the nearest absolute font stretch property to the given |
| * font stretch |
| * @param baseProperty the font stretch property as set on the parent fo |
| * @param direction should be -1 to get the next narrower value or +1 for the next wider value |
| */ |
| private Property computeNextAbsoluteFontStretch(Property baseProperty, int direction) { |
| // Create the table entries the first time around |
| // @todo is this thread safe, do we need to worry about this here? |
| if (orderedFontStretchValues == null) { |
| orderedFontStretchValues = new Property[] { |
| checkEnumValues("ultra-condensed"), |
| checkEnumValues("extra-condensed"), |
| checkEnumValues("condensed"), |
| checkEnumValues("semi-condensed"), |
| checkEnumValues("normal"), |
| checkEnumValues("semi-expanded"), |
| checkEnumValues("expanded"), |
| checkEnumValues("extra-expanded"), |
| checkEnumValues("ultra-expanded") |
| }; |
| } |
| int baseValue = baseProperty.getEnum(); |
| for (int i = 0; i < orderedFontStretchValues.length; i++) { |
| if (baseValue == orderedFontStretchValues[i].getEnum()) { |
| // increment/decrement the index and make sure its within the array bounds |
| i = Math.min(Math.max(0, i + direction), orderedFontStretchValues.length - 1); |
| return orderedFontStretchValues[i]; |
| } |
| } |
| // return the normal value |
| return orderedFontStretchValues[4]; |
| } |
| |
| } |