klease 01/11/11 06:13:51
Added: src/org/apache/fop/layoutmgr BlockLayoutManager.java
LineLayoutManager.java TextLayoutManager.java
Log:
new layout managers
Revision Changes Path
1.1 xml-fop/src/org/apache/fop/layoutmgr/BlockLayoutManager.java
Index: BlockLayoutManager.java
===================================================================
/*
* $Id: BlockLayoutManager.java,v 1.1 2001/11/11 14:13:51 klease Exp $
* 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.layoutmgr;
import org.apache.fop.fo.FObj;
import org.apache.fop.area.Area;
import org.apache.fop.area.BlockParent;
import org.apache.fop.area.Block;
import org.apache.fop.area.LineArea;
import java.util.ListIterator;
/**
* LayoutManager for a block FO.
*/
public class BlockLayoutManager extends BlockStackingLayoutManager {
private Block curBlockArea;
public BlockLayoutManager(FObj fobj) {
super(fobj);
}
// DESIGN. Potential alternative to getParentArea() scheme
// /**
// * Called by child layout manager to get the available space for
// * content in the inline progression direction.
// * Note that a manager may need to ask its parent for this.
// * For a block area, available IPD is determined by indents.
// */
// public int getContentIPD() {
// getArea(); // make if not existing
// return blockArea.getIPD();
// }
/**
* Generate areas by tellings all layout managers for its FO's
* children to generate areas.
*/
public void generateAreas() {
ListIterator children = fobj.getChildren();
while (children.hasNext()) {
LayoutManager lm = ((FObj)children.next()).getLayoutManager();
if (lm != null) {
if (lm.generatesInlineAreas()) {
// Back up one
children.previous();
lm = new LineLayoutManager(children);
}
lm.setParentLM(this);
lm.generateAreas();
}
}
flush(); // Add last area to parent
}
/**
* Return an Area which can contain the passed childArea. The childArea
* may not yet have any content, but it has essential traits set.
* In general, if the LayoutManager already has an Area it simply returns
* it. Otherwise, it makes a new Area of the appropriate class.
* It gets a parent area for its area by calling its parent LM.
* Finally, based on the dimensions of the parent area, it initializes
* its own area. This includes setting the content IPD and the maximum
* BPD.
*/
public Area getParentArea(Area childArea) {
if (curBlockArea == null) {
curBlockArea = new Block();
// Set up dimensions
// Must get dimensions from parent area
//MinOptMax referenceIPD = parentLM.getReferenceIPD();
Area parentArea = parentLM.getParentArea(curBlockArea);
// Get reference IPD from parentArea
setCurrentArea(curBlockArea); // ??? for generic operations
}
return curBlockArea;
}
public void addChild(Area childArea) {
if (curBlockArea != null) {
if (childArea instanceof LineArea) {
// Something about widows and orphans
// Position the line area and calculate size...
curBlockArea.addLineArea((LineArea)childArea);
}
else {
super.addChild(childArea);
}
}
}
// /**
// * Called by child LayoutManager when it has filled one of its areas.
// * If no current container, make one.
// * See if the area will fit in the current container.
// * If so, add it.
// * @param childArea the area to add: will either be a LineArea or
// * a BlockArea.
// */
// public void addChild(Area childArea) {
// /* If the childArea fits entirely in the maximum available BPD
// * add it and return an OK status.
// * If it doesn't all fit, overrun or ask for split?
// * Might as well just add it since the page layout process
// * may need to make other adjustments, resulting in changing
// * split point.
// */
// // Things like breaks on child area can cause premature
// // termination of the current area.
// /* We go past the theoretical maximum to be able to handle things
// * like widows.
// */
// // WARNING: this doesn't take into account space-specifier
// // adujstment between childArea and last content of blockArea!
// if (blockArea.getContentBPD().min + childArea.getAllocationBPD().min
// > blockArea.getAvailBPD().max) {
// if (++extraLines <= iWidows) {
// blockArea.add(childArea);
// }
// else {
// blockArea.setIsLast(false);
// parentLM.addChildArea(blockArea);
// // Make a new one for this area
// blockArea = makeAreaForChild(childArea);
// extraLines = 0; // Count potential widows
// blockArea.add(childArea);
// }
// }
// else {
// blockArea.add(childArea);
// }
// }
}
1.1 xml-fop/src/org/apache/fop/layoutmgr/LineLayoutManager.java
Index: LineLayoutManager.java
===================================================================
/*
* $Id: LineLayoutManager.java,v 1.1 2001/11/11 14:13:51 klease Exp $
* 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.layoutmgr;
import org.apache.fop.fo.FObj;
import org.apache.fop.area.Area;
import org.apache.fop.area.LineArea;
import org.apache.fop.area.MinOptMax;
import org.apache.fop.area.inline.InlineArea;
import java.util.ListIterator;
/**
* LayoutManager for lines. It builds one or more lines containing
* inline areas generated by its sub layout managers.
*/
public class LineLayoutManager extends AbstractLayoutManager {
/** Reference to FO whose areas it's managing or to the traits
* of the FO.
*/
private ListIterator fobjIter;
private LineArea lineArea = null;
private boolean bFirstLine;
private LayoutManager curLM;
private MinOptMax remainingIPD;
public LineLayoutManager(ListIterator fobjIter) {
super(null);
this.fobjIter = fobjIter;
}
/**
* Call child layout managers to generate content as long as they
* generate inline areas. If a block-level generating LM is found,
* finish any line being filled and return to the parent LM.
*/
public void generateAreas() {
this.bFirstLine = true;
while (fobjIter.hasNext()) {
FObj fobj = (FObj)fobjIter.next();
curLM = fobj.getLayoutManager();
if (curLM != null) {
if (curLM.generatesInlineAreas()==false) {
// It generates blocks, pass back to parent
// Back up one
fobjIter.previous();
break;
}
else { // generates inline area
curLM.setParentLM(this);
curLM.generateAreas();
}
}
}
flush(); // Add last area to parent
}
/**
* Align and position curLine and add it to parentContainer.
* Set curLine to null.
*/
public void flush() {
if (lineArea != null) {
// Adjust spacing as necessary
// Calculate height, based on content (or does the Area do this?)
parentLM.addChild(lineArea);
lineArea = null;
}
}
/**
* Return current lineArea or generate a new one if necessary.
*/
public Area getParentArea(Area childArea) {
if (lineArea == null) {
createLine();
}
return lineArea;
}
private void createLine() {
lineArea = new LineArea();
/* Set line IPD from parentArea
* This accounts for indents. What about first line indent?
* Should we set an "isFirst" flag on the lineArea to signal
* that to the parent (Block) LM? That's where indent property
* information will be managed.
*/
Area parent = parentLM.getParentArea(lineArea);
// lineArea.setContentIPD(parent.getContentIPD());
// remainingIPD = parent.getContentIPD();
// OR???
// remainingIPD = parentLM.getContentIPD();
remainingIPD = new MinOptMax(100000); // TESTING!!!
this.bFirstLine = false;
}
/**
* Called by child LayoutManager when it has filled one of its areas.
* See if the area will fit in the current container.
* If so, add it.
* This should also handle floats if childArea is an anchor.
* @param childArea the area to add: should be an InlineArea subclass!
*/
public void addChild(Area childArea) {
if ((childArea instanceof InlineArea)==false) {
// SIGNAL AN ERROR!!!
return;
}
InlineArea inlineArea = (InlineArea)childArea;
if (lineArea == null) {
createLine();
}
if (inlineArea.getAllocationIPD().min < remainingIPD.max) {
lineArea.addInlineArea(inlineArea);
remainingIPD.subtract(inlineArea.getAllocationIPD());
// Calculate number of spaces
// Forced line break after this area (ex. ends with LF in nowrap)
/* NOTYET!
if (inlineArea.breakAfter()) {
flush();
}
*/
/* Check if line could end after this area (potential line-break
* character. If not, it must be joined with following inline
* area to make a word. Otherwise, if the line could break here
* and if it is "full", add it to the parent area.
*/
if (remainingIPD.min<=0) {
flush();
}
}
else {
/* The inline area won't entirely fit in this line. Ask its
* layout manager to split it (by hyphenation for example),
* in order to fit part of it in the line.
* Note: only the current child LM could have generated this
* area, so we ask it to do the split.
*/
SplitContext splitContext = new SplitContext(remainingIPD);
if (curLM.splitArea(inlineArea, splitContext)) {
// inlineArea should now fit
lineArea.addInlineArea(inlineArea);
flush();
}
addChild(splitContext.nextArea);
}
}
}
1.1 xml-fop/src/org/apache/fop/layoutmgr/TextLayoutManager.java
Index: TextLayoutManager.java
===================================================================
/*
* $Id: TextLayoutManager.java,v 1.1 2001/11/11 14:13:51 klease Exp $
* 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.layoutmgr;
import org.apache.fop.fo.FObj;
import org.apache.fop.area.Area;
import org.apache.fop.area.inline.Word;
import java.util.ListIterator;
/**
* LayoutManager for text (a sequence of characters) which generates one
* more inline areas.
*/
public class TextLayoutManager extends AbstractLayoutManager {
private char[] chars;
private Word curWordArea;
public TextLayoutManager(FObj fobj, char[] chars) {
super(fobj);
this.chars = chars;
}
/**
* Generate inline areas for words in text.
*/
public void generateAreas() {
// Iterate over characters and make text areas.
// Add each one to parent. Handle word-space.
curWordArea = new Word();
curWordArea.setWord(new String(chars));
flush();
}
protected void flush() {
parentLM.addChild(curWordArea);
}
public boolean generatesInlineAreas() {
return true;
}
/**
* This is a leaf-node, so this method is never called.
*/
public void addChild(Area childArea) {}
/**
* This is a leaf-node, so this method is never called.
*/
public Area getParentArea(Area childArea) {
return null;
}
/** Try to split the word area by hyphenating the word. */
public boolean splitArea(Area areaToSplit, SplitContext context) {
context.nextArea = areaToSplit;
return false;
}
}
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