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- /*
- * $Id$
- * Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
- * For details on use and redistribution please refer to the
- * LICENSE file included with these sources.
- */
-
- package org.apache.fop.layout;
-
- // FOP
- import org.apache.fop.render.Renderer;
- import org.apache.fop.fo.flow.*;
- import org.apache.fop.fo.*;
- import org.apache.fop.apps.*;
- import org.apache.fop.fo.properties.*;
-
- // Java
- import java.util.Vector;
- import java.util.Enumeration;
- import org.apache.fop.messaging.MessageHandler;
-
- /**
- * This class represents a Block Area.
- * A block area is made up of a sequence of Line Areas.
- *
- * This class is used to organise the sequence of line areas as
- * inline areas are added to this block it creates and ands line areas
- * to hold the inline areas.
- * This uses the line-height and line-stacking-strategy to work
- * out how to stack the lines.
- */
- public class BlockArea extends Area {
-
- /* relative to area container */
- protected int startIndent;
- protected int endIndent;
-
- /* first line startIndent modifier */
- protected int textIndent;
-
- protected int lineHeight;
-
- protected int halfLeading;
-
-
- /* text-align of all but the last line */
- protected int align;
-
- /* text-align of the last line */
- protected int alignLastLine;
-
- protected LineArea currentLineArea;
- protected LinkSet currentLinkSet;
-
- /* have any line areas been used? */
- protected boolean hasLines = false;
-
- /* hyphenation */
- protected HyphenationProps hyphProps;
-
- protected Vector pendingFootnotes = null;
-
- public BlockArea(FontState fontState, int allocationWidth, int maxHeight,
- int startIndent, int endIndent, int textIndent,
- int align, int alignLastLine, int lineHeight) {
- super(fontState, allocationWidth, maxHeight);
-
- this.startIndent = startIndent;
- this.endIndent = endIndent;
- this.textIndent = textIndent;
- this.contentRectangleWidth = allocationWidth - startIndent
- - endIndent;
- this.align = align;
- this.alignLastLine = alignLastLine;
- this.lineHeight = lineHeight;
-
- if (fontState != null)
- this.halfLeading = (lineHeight - fontState.getFontSize()) / 2;
- }
-
- /**
- * Add a Line Area to this block area.
- * Used internally to add a completed line area to this block area
- * when either a new line area is created or this block area is
- * completed.
- *
- * @param la the LineArea to add
- */
- protected void addLineArea(LineArea la) {
- if (!la.isEmpty()) {
- la.verticalAlign();
- this.addDisplaySpace(this.halfLeading);
- int size = la.getHeight();
- this.addChild(la);
- this.increaseHeight(size);
- this.addDisplaySpace(this.halfLeading);
- }
- // add pending footnotes
- if (pendingFootnotes != null) {
- for (Enumeration e = pendingFootnotes.elements();
- e.hasMoreElements(); ) {
- FootnoteBody fb = (FootnoteBody)e.nextElement();
- Page page = getPage();
- if (!Footnote.layoutFootnote(page, fb, this)) {
- page.addPendingFootnote(fb);
- }
- }
- pendingFootnotes = null;
- }
- }
-
- /**
- * Get the current line area in this block area.
- * This is used to get the current line area for adding
- * inline objects to.
- * This will return null if there is not enough room left
- * in the block area to accomodate the line area.
- *
- * @return the line area to be used to add inlie objects
- */
- public LineArea getCurrentLineArea() {
- if (currentHeight + lineHeight > maxHeight) {
- return null;
- }
- this.currentLineArea.changeHyphenation(hyphProps);
- this.hasLines = true;
- return this.currentLineArea;
- }
-
- /**
- * Create a new line area to add inline objects.
- * This should be called after getting the current line area
- * and discovering that the inline object will not fit inside the current
- * line. This method will create a new line area to place the inline
- * object into.
- * This will return null if the new line cannot fit into the block area.
- *
- * @return the new current line area, which will be empty.
- */
- public LineArea createNextLineArea() {
- if (this.hasLines) {
- this.currentLineArea.align(this.align);
- this.addLineArea(this.currentLineArea);
- }
- this.currentLineArea = new LineArea(fontState, lineHeight,
- halfLeading, allocationWidth,
- startIndent, endIndent,
- currentLineArea);
- this.currentLineArea.changeHyphenation(hyphProps);
- if (currentHeight + lineHeight > maxHeight) {
- return null;
- }
- return this.currentLineArea;
- }
-
- public void setupLinkSet(LinkSet ls) {
- if (ls != null) {
- this.currentLinkSet = ls;
- ls.setYOffset(currentHeight);
- }
- }
-
- /**
- * Notify this block that the area has completed layout.
- * Indicates the the block has been fully laid out, this will
- * add (if any) the current line area.
- */
- public void end() {
- if (this.hasLines) {
- this.currentLineArea.addPending();
- this.currentLineArea.align(this.alignLastLine);
- this.addLineArea(this.currentLineArea);
- }
- }
-
- public void start() {
- currentLineArea = new LineArea(fontState, lineHeight, halfLeading,
- allocationWidth,
- startIndent + textIndent, endIndent,
- null);
- }
-
- public int getEndIndent() {
- return endIndent;
- }
-
- // KL: I think we should just return startIndent here!
- public int getStartIndent() {
- // return startIndent + paddingLeft + borderWidthLeft;
- return startIndent;
- }
-
- public void setIndents(int startIndent, int endIndent) {
- this.startIndent = startIndent;
- this.endIndent = endIndent;
- this.contentRectangleWidth = allocationWidth - startIndent
- - endIndent;
- }
-
- /**
- * Return the maximum space remaining for this area's content in
- * the block-progression-dimension.
- * Remove top and bottom padding and spacing since these reduce
- * available space for content and they are not yet accounted for
- * in the positioning of the object.
- */
- public int spaceLeft() {
- // return maxHeight - currentHeight ;
- return maxHeight - currentHeight -
- (getPaddingTop() + getPaddingBottom()
- + getBorderTopWidth() + getBorderBottomWidth());
- }
-
- public int getHalfLeading() {
- return halfLeading;
- }
-
- public void setHyphenation(HyphenationProps hyphProps) {
- this.hyphProps = hyphProps;
- }
-
- public void addFootnote(FootnoteBody fb) {
- if (pendingFootnotes == null) {
- pendingFootnotes = new Vector();
- }
- pendingFootnotes.addElement(fb);
- }
-
- }
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