| /* |
| * 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.inline; |
| |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import org.apache.fop.area.Trait; |
| import org.apache.fop.fo.flow.Character; |
| import org.apache.fop.fo.properties.CommonBorderPaddingBackground; |
| import org.apache.fop.fonts.Font; |
| import org.apache.fop.fonts.FontSelector; |
| import org.apache.fop.layoutmgr.InlineKnuthSequence; |
| import org.apache.fop.layoutmgr.KnuthElement; |
| import org.apache.fop.layoutmgr.KnuthGlue; |
| import org.apache.fop.layoutmgr.KnuthPenalty; |
| import org.apache.fop.layoutmgr.KnuthSequence; |
| import org.apache.fop.layoutmgr.LayoutContext; |
| import org.apache.fop.layoutmgr.LeafPosition; |
| import org.apache.fop.layoutmgr.Position; |
| import org.apache.fop.layoutmgr.TraitSetter; |
| import org.apache.fop.traits.MinOptMax; |
| import org.apache.fop.traits.SpaceVal; |
| import org.apache.fop.util.CharUtilities; |
| |
| /** |
| * LayoutManager for the fo:character formatting object |
| */ |
| public class CharacterLayoutManager extends LeafNodeLayoutManager { |
| private MinOptMax letterSpaceIPD; |
| private int hyphIPD; |
| private Font font; |
| private CommonBorderPaddingBackground borderProps = null; |
| |
| /** |
| * Constructor |
| * |
| * @param node the fo:character formatting object |
| */ |
| public CharacterLayoutManager(Character node) { |
| super(node); |
| } |
| |
| /** {@inheritDoc} */ |
| public void initialize() { |
| Character fobj = (Character)this.fobj; |
| font = FontSelector.selectFontForCharacter(fobj, this); |
| SpaceVal ls = SpaceVal.makeLetterSpacing(fobj.getLetterSpacing()); |
| letterSpaceIPD = ls.getSpace(); |
| hyphIPD = fobj.getCommonHyphenation().getHyphIPD(font); |
| borderProps = fobj.getCommonBorderPaddingBackground(); |
| setCommonBorderPaddingBackground(borderProps); |
| org.apache.fop.area.inline.TextArea chArea = getCharacterInlineArea(fobj); |
| chArea.setBaselineOffset(font.getAscender()); |
| setCurrentArea(chArea); |
| } |
| |
| private org.apache.fop.area.inline.TextArea getCharacterInlineArea(Character node) { |
| org.apache.fop.area.inline.TextArea text |
| = new org.apache.fop.area.inline.TextArea(); |
| char ch = node.getCharacter(); |
| if (CharUtilities.isAnySpace(ch)) { |
| // add space unless it's zero-width: |
| if (!CharUtilities.isZeroWidthSpace(ch)) { |
| text.addSpace(ch, 0, CharUtilities.isAdjustableSpace(ch)); |
| } |
| } else { |
| text.addWord(String.valueOf(ch), 0); |
| } |
| TraitSetter.setProducerID(text, node.getId()); |
| TraitSetter.addTextDecoration(text, node.getTextDecoration()); |
| return text; |
| } |
| |
| /** {@inheritDoc} */ |
| public List getNextKnuthElements(LayoutContext context, int alignment) { |
| MinOptMax ipd; |
| curArea = get(context); |
| KnuthSequence seq = new InlineKnuthSequence(); |
| |
| if (curArea == null) { |
| setFinished(true); |
| return null; |
| } |
| |
| Character fobj = (Character)this.fobj; |
| |
| ipd = new MinOptMax(font.getCharWidth(fobj.getCharacter())); |
| |
| curArea.setIPD(ipd.opt); |
| curArea.setBPD(font.getAscender() - font.getDescender()); |
| |
| TraitSetter.addFontTraits(curArea, font); |
| curArea.addTrait(Trait.COLOR, fobj.getColor()); |
| |
| // TODO: may need some special handling for fo:character |
| alignmentContext = new AlignmentContext(font |
| , font.getFontSize() |
| , fobj.getAlignmentAdjust() |
| , fobj.getAlignmentBaseline() |
| , fobj.getBaselineShift() |
| , fobj.getDominantBaseline() |
| , context.getAlignmentContext()); |
| |
| addKnuthElementsForBorderPaddingStart(seq); |
| |
| // create the AreaInfo object to store the computed values |
| areaInfo = new AreaInfo((short) 0, ipd, false, alignmentContext); |
| |
| // node is a fo:Character |
| if (letterSpaceIPD.min == letterSpaceIPD.max) { |
| // constant letter space, only return a box |
| seq.add(new KnuthInlineBox(areaInfo.ipdArea.opt, areaInfo.alignmentContext, |
| notifyPos(new LeafPosition(this, 0)), false)); |
| } else { |
| // adjustable letter space, return a sequence of elements; |
| // at the moment the character is supposed to have no letter spaces, |
| // but returning this sequence allows us to change only one element |
| // if addALetterSpaceTo() is called |
| seq.add(new KnuthInlineBox(areaInfo.ipdArea.opt, areaInfo.alignmentContext, |
| notifyPos(new LeafPosition(this, 0)), false)); |
| seq.add(new KnuthPenalty(0, KnuthElement.INFINITE, false, |
| new LeafPosition(this, -1), true)); |
| seq.add(new KnuthGlue(0, 0, 0, |
| new LeafPosition(this, -1), true)); |
| seq.add(new KnuthInlineBox(0, null, |
| notifyPos(new LeafPosition(this, -1)), true)); |
| } |
| |
| addKnuthElementsForBorderPaddingEnd(seq); |
| |
| LinkedList returnList = new LinkedList(); |
| returnList.add(seq); |
| setFinished(true); |
| return returnList; |
| } |
| |
| /** {@inheritDoc} */ |
| public void getWordChars(StringBuffer sbChars, Position bp) { |
| sbChars.append |
| (((org.apache.fop.area.inline.TextArea) curArea).getText()); |
| } |
| |
| /** {@inheritDoc} */ |
| public void hyphenate(Position pos, HyphContext hc) { |
| if (hc.getNextHyphPoint() == 1) { |
| // the character ends a syllable |
| areaInfo.bHyphenated = true; |
| isSomethingChanged = true; |
| } else { |
| // hc.getNextHyphPoint() returned -1 (no more hyphenation points) |
| // or a number > 1; |
| // the character does not end a syllable |
| } |
| hc.updateOffset(1); |
| } |
| |
| /** {@inheritDoc} */ |
| public boolean applyChanges(List oldList) { |
| setFinished(false); |
| return isSomethingChanged; |
| } |
| |
| /** {@inheritDoc} */ |
| public List getChangedKnuthElements(List oldList, int alignment) { |
| if (isFinished()) { |
| return null; |
| } |
| |
| LinkedList returnList = new LinkedList(); |
| |
| addKnuthElementsForBorderPaddingStart(returnList); |
| |
| if (letterSpaceIPD.min == letterSpaceIPD.max |
| || areaInfo.iLScount == 0) { |
| // constant letter space, or no letter space |
| returnList.add(new KnuthInlineBox(areaInfo.ipdArea.opt, |
| areaInfo.alignmentContext, |
| notifyPos(new LeafPosition(this, 0)), false)); |
| if (areaInfo.bHyphenated) { |
| returnList.add |
| (new KnuthPenalty(hyphIPD, KnuthPenalty.FLAGGED_PENALTY, true, |
| new LeafPosition(this, -1), false)); |
| } |
| } else { |
| // adjustable letter space |
| returnList.add |
| (new KnuthInlineBox(areaInfo.ipdArea.opt |
| - areaInfo.iLScount * letterSpaceIPD.opt, |
| areaInfo.alignmentContext, |
| notifyPos(new LeafPosition(this, 0)), false)); |
| returnList.add(new KnuthPenalty(0, KnuthElement.INFINITE, false, |
| new LeafPosition(this, -1), true)); |
| returnList.add |
| (new KnuthGlue(areaInfo.iLScount * letterSpaceIPD.opt, |
| areaInfo.iLScount * letterSpaceIPD.max - letterSpaceIPD.opt, |
| areaInfo.iLScount * letterSpaceIPD.opt - letterSpaceIPD.min, |
| new LeafPosition(this, -1), true)); |
| returnList.add(new KnuthInlineBox(0, null, |
| notifyPos(new LeafPosition(this, -1)), true)); |
| if (areaInfo.bHyphenated) { |
| returnList.add |
| (new KnuthPenalty(hyphIPD, KnuthPenalty.FLAGGED_PENALTY, true, |
| new LeafPosition(this, -1), false)); |
| } |
| } |
| |
| addKnuthElementsForBorderPaddingEnd(returnList); |
| |
| setFinished(true); |
| return returnList; |
| } |
| |
| } |
| |
