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/*******************************************************************************
* Copyright (c) 2002, 2006 QNX Software Systems 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:
* QNX Software Systems - Initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.internal.ui.buildconsole;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.DocumentEvent;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IDocumentListener;
import org.eclipse.jface.text.ITypedRegion;
import org.eclipse.jface.text.TextViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.LineStyleEvent;
import org.eclipse.swt.custom.LineStyleListener;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.widgets.Composite;
public class BuildConsoleViewer extends TextViewer implements LineStyleListener {
protected InternalDocumentListener fInternalDocumentListener = new InternalDocumentListener();
/**
* Whether the console scrolls as output is appended.
*/
private boolean fAutoScroll = true;
/**
* Internal document listener.
*/
class InternalDocumentListener implements IDocumentListener {
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.text.IDocumentListener#documentAboutToBeChanged(org.eclipse.jface.text.DocumentEvent)
*/
public void documentAboutToBeChanged(DocumentEvent e) {
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.text.IDocumentListener#documentChanged(org.eclipse.jface.text.DocumentEvent)
*/
public void documentChanged(DocumentEvent e) {
revealEndOfDocument();
}
}
/**
* Sets whether this viewer should auto-scroll as output is appended to the
* document.
*
* @param scroll
*/
public void setAutoScroll(boolean scroll) {
fAutoScroll = scroll;
}
/**
* Returns whether this viewer should auto-scroll as output is appended to
* the document.
*/
public boolean isAutoScroll() {
return fAutoScroll;
}
/**
* Creates a new console viewer and adds verification checking to only
* allow text modification if the text is being modified in the editable
* portion of the underlying document.
*
* @see org.eclipse.swt.events.VerifyListener
*/
public BuildConsoleViewer(Composite parent) {
super(parent, getSWTStyles());
getTextWidget().setDoubleClickEnabled(true);
getTextWidget().setFont(parent.getFont());
getTextWidget().addLineStyleListener(this);
getTextWidget().setEditable(false);
getTextWidget().setWordWrap(true);
}
/**
* Returns the SWT style flags used when instantiating this viewer
*/
private static int getSWTStyles() {
int styles = SWT.H_SCROLL | SWT.V_SCROLL;
return styles;
}
/**
* Reveals (makes visible) the end of the current document
*/
protected void revealEndOfDocument() {
if (isAutoScroll()) {
IDocument doc = getDocument();
int lines = doc.getNumberOfLines();
try {
// lines are 0-based
int lineStartOffset = doc.getLineOffset(lines - 1);
StyledText widget = getTextWidget();
if (lineStartOffset > 0) {
widget.setCaretOffset(lineStartOffset);
widget.showSelection();
}
int lineEndOffset = lineStartOffset + doc.getLineLength(lines - 1);
if (lineEndOffset > 0) {
widget.setCaretOffset(lineEndOffset);
}
} catch (BadLocationException e) {
}
}
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.text.ITextViewer#setDocument(org.eclipse.jface.text.IDocument)
*/
public void setDocument(IDocument doc) {
IDocument oldDoc = getDocument();
IDocument document = doc;
if (oldDoc == null && document == null) {
return;
}
if (oldDoc != null) {
oldDoc.removeDocumentListener(fInternalDocumentListener);
if (oldDoc.equals(document)) {
document.addDocumentListener(fInternalDocumentListener);
return;
}
}
super.setDocument(document);
if (document != null) {
revealEndOfDocument();
document.addDocumentListener(fInternalDocumentListener);
}
}
/*
* (non-Javadoc)
*
* @see org.eclipse.swt.custom.LineStyleListener#lineGetStyle(org.eclipse.swt.custom.LineStyleEvent)
*/
public void lineGetStyle(LineStyleEvent event) {
IDocument document = getDocument();
if (document != null) {
BuildConsolePartitioner partitioner = (BuildConsolePartitioner) document.getDocumentPartitioner();
if (partitioner != null) {
ITypedRegion[] regions = partitioner.computePartitioning(event.lineOffset, event.lineOffset
+ event.lineText.length());
StyleRange[] styles = new StyleRange[regions.length];
for (int i = 0; i < regions.length; i++) {
BuildConsolePartition partition = (BuildConsolePartition) regions[i];
Color color = partition.getStream().getColor();
styles[i] = new StyleRange(partition.getOffset(), partition.getLength(), color, null);
}
event.styles = styles;
}
}
}
}
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