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/*
* Copyright 2005 The Apache Software Foundation.
*
* Licensed 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 InlineArea {
/**
* 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 adjustingInfo = 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) {
adjustingInfo = 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) {
adjustingInfo.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 (adjustingInfo != 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) adjustingInfo.availableStretch / adjustingInfo.availableShrink)
* ((double) lineShrink / lineStretch);
} else {
// from a positive adjustment to a negative one
balancingFactor
= ((double) adjustingInfo.availableShrink / adjustingInfo.availableStretch)
* ((double) lineStretch / lineShrink);
}
}
textWordSpaceAdjust = (int) ((textWordSpaceAdjust - adjustingInfo.spaceDifference)
* variationFactor * balancingFactor)
+ adjustingInfo.spaceDifference;
textLetterSpaceAdjust *= variationFactor;
// update the ipd of the area
int oldAdjustment = adjustingInfo.adjustment;
adjustingInfo.adjustment *= balancingFactor * variationFactor;
ipd += adjustingInfo.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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