/*******************************************************************************
* Copyright (c) 2000, 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
// copied directly from org.eclipse.jface.internal.text.link.contentassist.HTMLTextPresenter;
package com.aptana.ide.editors.unified.utils;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.util.Iterator;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.TextPresentation;
import org.eclipse.jface.text.DefaultInformationControl.IInformationPresenter;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.widgets.Display;
import com.aptana.ide.core.CoreStrings;
import com.aptana.ide.core.StringUtils;
/**
* Note: apparently we eventually can switch to using the browser widget here
*/
public class HTMLTextPresenter implements IInformationPresenter
{
private static final String LINE_DELIM = System.getProperty("line.separator", "\n"); //$NON-NLS-1$ //$NON-NLS-2$
private int fCounter;
private boolean fEnforceUpperLineLimit;
/**
* HTMLTextPresenter
*
* @param enforceUpperLineLimit
*/
public HTMLTextPresenter(boolean enforceUpperLineLimit)
{
super();
fEnforceUpperLineLimit = enforceUpperLineLimit;
}
/**
* HTMLTextPresenter
*/
public HTMLTextPresenter()
{
this(true);
}
/**
* adaptTextPresentation
*
* @param presentation
* @param offset
* @param insertLength
*/
protected void adaptTextPresentation(TextPresentation presentation, int offset, int insertLength)
{
int yoursStart = offset;
int yoursEnd = offset + insertLength - 1;
yoursEnd = Math.max(yoursStart, yoursEnd);
Iterator e = presentation.getAllStyleRangeIterator();
while (e.hasNext())
{
StyleRange range = (StyleRange) e.next();
int myStart = range.start;
int myEnd = range.start + range.length - 1;
myEnd = Math.max(myStart, myEnd);
if (myEnd < yoursStart)
{
continue;
}
if (myStart < yoursStart)
{
range.length += insertLength;
}
else
{
range.start += insertLength;
}
}
}
/**
* Creates the specified text reader for the presentation
*
* @param hoverInfo
* @param presentation
* @param display
* @return a new HTMLTextReader object
*/
protected Reader createReader(String hoverInfo, TextPresentation presentation, Display display)
{
return new HTML2TextReader(new StringReader(hoverInfo), presentation, display);
}
private void append(StringBuffer buffer, String string, TextPresentation presentation)
{
int length = string.length();
buffer.append(string);
if (presentation != null)
{
adaptTextPresentation(presentation, fCounter, length);
}
fCounter += length;
}
/**
* see org.eclipse.jface.text.DefaultInformationControl$IInformationPresenter#updatePresentation(org.eclipse.swt.widgets.Display, java.lang.String, org.eclipse.jface.text.TextPresentation, int, int)
*
* @param display
* @param hoverInfo
* @param presentation
* @param maxWidth
* @param maxHeight
* @return int
*/
public String updatePresentation(Display display, String hoverInfo, TextPresentation presentation, int maxWidth,
int maxHeight)
{
if (hoverInfo == null)
{
return null;
}
/*
* if(false) { StringBuffer sb = new StringBuffer(); sb.append("<head><style>h2 { font-size:11px; margin:0px;
* padding: 0px;} </style></head>"); sb.append("<body bgcolor=\"#ffffe1\" style=\"font-size:9px; font-family:
* Verdana, sans-serif; margin:0px;\">"); sb.append(hoverInfo); sb.append("</body>"); return sb.toString(); }
*/
GC gc = new GC(display);
try
{
StringBuffer buffer = new StringBuffer();
int maxNumberOfLines = Math.round(maxHeight / gc.getFontMetrics().getHeight());
fCounter = 0;
LineBreakingReader reader = new LineBreakingReader(createReader(hoverInfo, presentation, display), gc,
maxWidth);
boolean lastLineFormatted = false;
String lastLineIndent = null;
String line = reader.readLine();
boolean lineFormatted = reader.isFormattedLine();
boolean firstLineProcessed = false;
while (line != null)
{
if (fEnforceUpperLineLimit && maxNumberOfLines <= 0)
{
break;
}
if (firstLineProcessed)
{
if (!lastLineFormatted)
{
append(buffer, LINE_DELIM, null);
}
else
{
append(buffer, LINE_DELIM, presentation);
if (lastLineIndent != null)
{
append(buffer, lastLineIndent, presentation);
}
}
}
append(buffer, line, null);
firstLineProcessed = true;
lastLineFormatted = lineFormatted;
if (!lineFormatted)
{
lastLineIndent = null;
}
// else if (lastLineIndent == null)
// lastLineIndent= getIndent(line);
line = reader.readLine();
lineFormatted = reader.isFormattedLine();
maxNumberOfLines--;
}
if (line != null)
{
append(buffer, LINE_DELIM, lineFormatted ? presentation : null);
append(buffer, System.getProperty("HTMLTextPresenter.ellipse", CoreStrings.ELLIPSIS), presentation); //$NON-NLS-1$
}
return trim(buffer, presentation);
}
catch (IOException e)
{
// ignore TODO do something else?
return null;
}
finally
{
gc.dispose();
}
}
private String trim(StringBuffer buffer, TextPresentation presentation)
{
int length = buffer.length();
int end = length - 1;
while (end >= 0 && Character.isWhitespace(buffer.charAt(end)))
{
--end;
}
if (end == -1)
{
return StringUtils.EMPTY;
}
if (end < length - 1)
{
buffer.delete(end + 1, length);
}
else
{
end = length;
}
int start = 0;
while (start < end && Character.isWhitespace(buffer.charAt(start)))
{
++start;
}
buffer.delete(0, start);
presentation.setResultWindow(new Region(start, buffer.length()));
return buffer.toString();
}
}