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RSyntaxTextArea is the syntax highlighting text editor for Swing applications. Features include syntax highlighting for 40+ languages, code folding, code completion, regex find and replace, macros, code templates, undo/redo, line numbering and bracket matching.
/*
* 02/10/2009
*
* LineHighlightManager - Manages line highlights.
* Copyright (C) 2009 Robert Futrell
* robert_futrell at users.sourceforge.net
* http://fifesoft.com/rsyntaxtextarea
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
package org.fife.ui.rtextarea;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.swing.text.BadLocationException;
import javax.swing.text.Position;
/**
* Manages line highlights in an RTextArea.
*
* @author Robert Futrell
* @version 1.0
*/
class LineHighlightManager {
private RTextArea textArea;
private List lineHighlights;
/**
* Constructor.
*
* @param textArea The parent text area.
*/
public LineHighlightManager(RTextArea textArea) {
this.textArea = textArea;
}
/**
* Highlights the specified line.
*
* @param line The line to highlight.
* @param color The color to highlight with.
* @return A tag for the highlight.
* @throws BadLocationException If line is not a valid line
* number.
* @see #removeLineHighlight(Object)
*/
public Object addLineHighlight(int line, Color color)
throws BadLocationException {
int offs = textArea.getLineStartOffset(line);
LineHighlightInfo lhi = new LineHighlightInfo(
textArea.getDocument().createPosition(offs), color);
if (lineHighlights==null) {
lineHighlights = new ArrayList(1);
}
int index = Collections.binarySearch(lineHighlights, lhi);
if (index<0) { // Common case
index = -(index+1);
}
lineHighlights.add(index, lhi);
repaintLine(lhi);
return lhi;
}
/**
* Paints any highlighted lines in the specified line range.
*
* @param g The graphics context.
*/
public void paintLineHighlights(Graphics g) {
int count = lineHighlights==null ? 0 : lineHighlights.size();
if (count>0) {
int docLen = textArea.getDocument().getLength();
Rectangle vr = textArea.getVisibleRect();
int lineHeight = textArea.getLineHeight();
try {
for (int i=0; i=0 && offs<=docLen) {
int y = textArea.yForLineContaining(offs);
if (y>vr.y-lineHeight) {
if (y length if they deleted text including the highlight
if (offs>=0 && offs<=textArea.getDocument().getLength()) {
try {
int y = textArea.yForLineContaining(offs);
if (y>-1) {
textArea.repaint(0, y,
textArea.getWidth(), textArea.getLineHeight());
}
} catch (BadLocationException ble) {
ble.printStackTrace(); // Never happens
}
}
}
/**
* Information about a line highlight.
*
* @author Robert Futrell
* @version 1.0
*/
private static class LineHighlightInfo implements Comparable {
private Position offs;
private Color color;
public LineHighlightInfo(Position offs, Color c) {
this.offs = offs;
this.color = c;
}
public int compareTo(Object o) {
if (o instanceof LineHighlightInfo) {
return offs.getOffset() - ((LineHighlightInfo)o).getOffset();
}
return -1;
}
public boolean equals(Object o) {
if (o==this) {
return true;
}
if (o instanceof LineHighlightInfo) {
return offs.getOffset()==((LineHighlightInfo)o).getOffset();
}
return false;
}
public Color getColor() {
return color;
}
public int getOffset() {
return offs.getOffset();
}
public int hashCode() {
return getOffset();
}
}
}