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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.fo.flow;
// FOP
import org.apache.fop.fo.*;
import org.apache.fop.fo.properties.*;
import org.apache.fop.datatypes.*;
import org.apache.fop.layout.*;
import org.apache.fop.layout.BlockArea;
import org.apache.fop.layout.inline.LeaderArea;
import org.apache.fop.layout.LineArea;
import org.apache.fop.layout.FontState;
import org.apache.fop.apps.FOPException;
import org.apache.fop.messaging.MessageHandler;
/**
* Implements fo:leader; main property of leader leader-pattern.
* The following patterns are treated: rule, space, dots.
* The pattern use-content is ignored, i.e. it still must be implemented.
*/
public class Leader extends FObjMixed {
public static class Maker extends FObj.Maker {
public FObj make(FObj parent,
PropertyList propertyList) throws FOPException {
return new Leader(parent, propertyList);
}
}
public static FObj.Maker maker() {
return new Leader.Maker();
}
public Leader(FObj parent, PropertyList propertyList) {
super(parent, propertyList);
this.name = "fo:leader";
}
public Status layout(Area area) throws FOPException {
BlockArea blockArea;
// restriction in this version
if (!(area instanceof BlockArea)) {
MessageHandler.errorln("WARNING: in this version of Fop fo:leader must be a direct child of fo:block ");
return new Status(Status.OK);
} else {
blockArea = (BlockArea)area;
}
// Common Accessibility Properties
AccessibilityProps mAccProps = propMgr.getAccessibilityProps();
// Common Aural Properties
AuralProps mAurProps = propMgr.getAuralProps();
// Common Border, Padding, and Background Properties
BorderAndPadding bap = propMgr.getBorderAndPadding();
BackgroundProps bProps = propMgr.getBackgroundProps();
// Common Font Properties
//this.fontState = propMgr.getFontState(area.getFontInfo());
// Common Margin Properties-Inline
MarginInlineProps mProps = propMgr.getMarginInlineProps();
// Common Relative Position Properties
RelativePositionProps mRelProps = propMgr.getRelativePositionProps();
// this.properties.get("alignment-adjust");
// this.properties.get("alignment-baseline");
// this.properties.get("baseline-shift");
// this.properties.get("color");
// this.properties.get("dominant-baseline");
// this.properties.get("text-depth");
// this.properties.get("text-altitude");
// this.properties.get("id");
// this.properties.get("leader-alignment");
// this.properties.get("leader-length");
// this.properties.get("leader-pattern");
// this.properties.get("leader-pattern-width");
// this.properties.get("rule-style");
// this.properties.get("rule-thickness");
// this.properties.get("letter-spacing");
// this.properties.get("line-height");
// this.properties.get("line-height-shift-adjustment");
// this.properties.get("text-shadow");
// this.properties.get("visibility");
// this.properties.get("word-spacing");
// this.properties.get("z-index");
// color properties
ColorType c = this.properties.get("color").getColorType();
float red = c.red();
float green = c.green();
float blue = c.blue();
// fo:leader specific properties
// determines the pattern of leader; allowed values: space, rule,dots, use-content
int leaderPattern = this.properties.get("leader-pattern").getEnum();
// length of the leader
int leaderLengthOptimum =
this.properties.get("leader-length.optimum").getLength().mvalue();
int leaderLengthMinimum =
this.properties.get("leader-length.minimum").getLength().mvalue();
int leaderLengthMaximum =
this.properties.get("leader-length.maximum").getLength().mvalue();
// the following properties only apply for leader-pattern = "rule"
int ruleThickness =
this.properties.get("rule-thickness").getLength().mvalue();
int ruleStyle = this.properties.get("rule-style").getEnum();
// if leaderPatternWidth = 0 = default = use-font-metric
int leaderPatternWidth =
this.properties.get("leader-pattern-width").getLength().mvalue();
int leaderAlignment =
this.properties.get("leader-alignment").getEnum();
// initialize id
String id = this.properties.get("id").getString();
blockArea.getIDReferences().initializeID(id, blockArea);
// adds leader to blockarea, there the leaderArea is generated
int succeeded = addLeader(blockArea,
propMgr.getFontState(area.getFontInfo()),
red, green, blue, leaderPattern,
leaderLengthMinimum, leaderLengthOptimum,
leaderLengthMaximum, ruleThickness,
ruleStyle, leaderPatternWidth,
leaderAlignment);
if (succeeded == 1) {
return new Status(Status.OK);
} else {
// not sure that this is the correct Status here
return new Status(Status.AREA_FULL_SOME);
}
}
/*
* //should only be necessary for use-content
* protected void addCharacters(char data[], int start, int length) {
* FOText textNode = new FOText(data,start,length, this);
* children.addElement(textNode);
* }
*/
/**
* adds a leader to current line area of containing block area
* the actual leader area is created in the line area
*
* @return int +1 for success and -1 for none
*/
public int addLeader(BlockArea ba, FontState fontState, float red,
float green, float blue, int leaderPattern,
int leaderLengthMinimum, int leaderLengthOptimum,
int leaderLengthMaximum, int ruleThickness,
int ruleStyle, int leaderPatternWidth,
int leaderAlignment) {
LineArea la = ba.getCurrentLineArea();
// this should start a new page
if (la == null) {
return -1;
}
la.changeFont(fontState);
la.changeColor(red, green, blue);
// check whether leader fits into the (rest of the) line
// using length.optimum to determine where to break the line as defined
// in the xsl:fo spec: "User agents may choose to use the value of 'leader-length.optimum'
// to determine where to break the line" (7.20.4)
// if leader is longer then create a new LineArea and put leader there
if (leaderLengthOptimum <= (la.getRemainingWidth())) {
la.addLeader(leaderPattern, leaderLengthMinimum,
leaderLengthOptimum, leaderLengthMaximum, ruleStyle,
ruleThickness, leaderPatternWidth, leaderAlignment);
} else {
la = ba.createNextLineArea();
if (la == null) {
// not enough room
return -1;
}
la.changeFont(fontState);
la.changeColor(red, green, blue);
// check whether leader fits into LineArea at all, otherwise
// clip it (should honor the clip option of containing area)
if (leaderLengthMinimum <= la.getContentWidth()) {
la.addLeader(leaderPattern, leaderLengthMinimum,
leaderLengthOptimum, leaderLengthMaximum,
ruleStyle, ruleThickness, leaderPatternWidth,
leaderAlignment);
} else {
MessageHandler.errorln("Leader doesn't fit into line, it will be clipped to fit.");
la.addLeader(leaderPattern, la.getRemainingWidth(),
leaderLengthOptimum, leaderLengthMaximum,
ruleStyle, ruleThickness, leaderPatternWidth,
leaderAlignment);
}
}
// this.hasLines = true;
return 1;
}
}
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