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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.area.inline;
-
- /**
- * Abstract base class for both TextArea and Character.
- */
- public abstract class AbstractTextArea extends InlineParent {
-
- /**
- * this class stores information about spaces and potential adjustments
- * that can be used in order to re-compute adjustments when a
- * page-number or a page-number-citation is resolved
- */
- protected class TextAdjustingInfo extends InlineAdjustingInfo {
-
- /** difference between the optimal width of a space
- * and the default width of a space according to the font
- * (this is equivalent to the property word-spacing.optimum)
- */
- protected int spaceDifference = 0;
-
- /**
- * Constructor
- *
- * @param stretch the available space for stretching
- * @param shrink the available space for shrinking
- * @param adj space adjustment type
- */
- protected TextAdjustingInfo(int stretch, int shrink, int adj) {
- super(stretch, shrink, adj);
- }
- }
-
- private int textWordSpaceAdjust = 0;
- private int textLetterSpaceAdjust = 0;
- private TextAdjustingInfo textAdjustingInfo = null;
- private int baselineOffset = 0;
-
- /**
- * Default constructor
- */
- public AbstractTextArea() {
- }
-
- /**
- * Constructor with extra parameters:
- * create a TextAdjustingInfo object
- * @param stretch the available stretch of the text
- * @param shrink the available shrink of the text
- * @param adj the current adjustment of the area
- */
- public AbstractTextArea(int stretch, int shrink, int adj) {
- textAdjustingInfo = new TextAdjustingInfo(stretch, shrink, adj);
- }
-
- /**
- * Get text word space adjust.
- *
- * @return the text word space adjustment
- */
- public int getTextWordSpaceAdjust() {
- return textWordSpaceAdjust;
- }
-
- /**
- * Set text word space adjust.
- *
- * @param textWordSpaceAdjust the text word space adjustment
- */
- public void setTextWordSpaceAdjust(int textWordSpaceAdjust) {
- this.textWordSpaceAdjust = textWordSpaceAdjust;
- }
-
- /**
- * Get text letter space adjust.
- *
- * @return the text letter space adjustment
- */
- public int getTextLetterSpaceAdjust() {
- return textLetterSpaceAdjust;
- }
-
- /**
- * Set text letter space adjust.
- *
- * @param textLetterSpaceAdjust the text letter space adjustment
- */
- public void setTextLetterSpaceAdjust(int textLetterSpaceAdjust) {
- this.textLetterSpaceAdjust = textLetterSpaceAdjust;
- }
-
- /**
- * Set the difference between optimal width of a space and
- * default width of a space according to the font; this part
- * of the space adjustment is fixed and must not be
- * multiplied by the variation factor.
- * @param spaceDiff the space difference
- */
- public void setSpaceDifference(int spaceDiff) {
- textAdjustingInfo.spaceDifference = spaceDiff;
- }
-
- /**
- * recursively apply the variation factor to all descendant areas
- * @param variationFactor the variation factor that must be applied to adjustments
- * @param lineStretch the total stretch of the line
- * @param lineShrink the total shrink of the line
- * @return true if there is an UnresolvedArea descendant
- */
- public boolean applyVariationFactor(double variationFactor,
- int lineStretch, int lineShrink) {
- if (textAdjustingInfo != null) {
- // compute the new adjustments:
- // if the variation factor is negative, it means that before
- // the ipd variation the line had to stretch and now it has
- // to shrink (or vice versa);
- // in this case, if the stretch and shrink are not equally
- // divided among the inline areas, we must compute a
- // balancing factor
- double balancingFactor = 1.0;
- if (variationFactor < 0) {
- if (textWordSpaceAdjust < 0) {
- // from a negative adjustment to a positive one
- balancingFactor
- = ((double) textAdjustingInfo.availableStretch / textAdjustingInfo.availableShrink)
- * ((double) lineShrink / lineStretch);
- } else {
- // from a positive adjustment to a negative one
- balancingFactor
- = ((double) textAdjustingInfo.availableShrink / textAdjustingInfo.availableStretch)
- * ((double) lineStretch / lineShrink);
- }
- }
- textWordSpaceAdjust = (int) ((textWordSpaceAdjust - textAdjustingInfo.spaceDifference)
- * variationFactor * balancingFactor)
- + textAdjustingInfo.spaceDifference;
- textLetterSpaceAdjust *= variationFactor;
- // update the ipd of the area
- int oldAdjustment = textAdjustingInfo.adjustment;
- textAdjustingInfo.adjustment *= balancingFactor * variationFactor;
- ipd += textAdjustingInfo.adjustment - oldAdjustment;
- }
- return false;
- }
-
- /**
- * Get baseline offset, i.e. the distance from the before edge
- * of this area to the nominal baseline.
- *
- * @return the baseline offset
- */
- public int getBaselineOffset() {
- return baselineOffset;
- }
-
- /**
- * Set the baseline offset.
- *
- * @param baselineOffset the baseline offset
- */
- public void setBaselineOffset(int baselineOffset) {
- this.baselineOffset = baselineOffset;
- }
- }
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