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/*******************************************************************************
* Copyright (c) 2000, 2003 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jface.text.source;
import java.util.Iterator;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.events.VerifyEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ISlaveDocumentManager;
import org.eclipse.jface.text.ITextViewerExtension3;
import org.eclipse.jface.text.Position;
import org.eclipse.jface.text.ProjectionDocument;
import org.eclipse.jface.text.ProjectionDocumentManager;
/**
* A projection source viewer is a source viewer which does not support the concept of a visible region. Instead it supports
* to dynamically hide and show regions of its document. Uses <code>ProjectionDocumentManager</code> as it internal slave document manager.<p>
* This class is for internal use only.
*
* @since 2.1
*/
public class ProjectionSourceViewer extends SourceViewer implements ISourceViewer, ITextViewerExtension3 {
/** The projection annotation model */
private IAnnotationModel fProjectionAnnotationModel;
/**
* Creates a new projection source viewer.
*
* @param parent the SWT parent control
* @param ruler the vertical ruler
* @param styles the SWT style bits
*/
public ProjectionSourceViewer(Composite parent, IVerticalRuler ruler, int styles) {
super(parent, ruler, styles);
}
/*
* @see ISourceViewer#setDocument(IDocument, IAnnotationModel, int, int)
*/
public void setDocument(IDocument document, IAnnotationModel annotationModel, int visibleRegionOffset, int visibleRegionLength) {
if (getDocument() != null && fProjectionAnnotationModel != null)
fProjectionAnnotationModel.disconnect(getDocument());
super.setDocument(document, annotationModel, visibleRegionOffset, visibleRegionLength);
if (getDocument() != null && fProjectionAnnotationModel != null)
fProjectionAnnotationModel.connect(getDocument());
}
/*
* @see TextViewer#handleDispose()
*/
protected void handleDispose() {
if (getDocument() != null && fProjectionAnnotationModel != null) {
fProjectionAnnotationModel.disconnect(getDocument());
fProjectionAnnotationModel= null;
}
super.handleDispose();
}
/**
* Returns the projection annotation model.
*
* @return the projection annotation model
*/
public IAnnotationModel getProjectionAnnotationModel() {
return fProjectionAnnotationModel;
}
/**
* Sets the projection annotation model.
*
* @param projectionAnnotationModel the projection annotation model
*/
public void setProjectionAnnotationModel(IAnnotationModel projectionAnnotationModel) {
fProjectionAnnotationModel= projectionAnnotationModel;
}
/*
* @see org.eclipse.jface.text.TextViewer#createSlaveDocumentManager()
*/
protected ISlaveDocumentManager createSlaveDocumentManager() {
return new ProjectionDocumentManager();
}
/*
* @see org.eclipse.jface.text.TextViewer#updateVisibleDocument(org.eclipse.jface.text.IDocument, int, int)
*/
protected boolean updateVisibleDocument(IDocument visibleDocument, int visibleRegionOffset, int visibleRegionLength) throws BadLocationException {
if (visibleDocument instanceof ProjectionDocument) {
ProjectionDocument document= (ProjectionDocument) visibleDocument;
document.addFragment(visibleRegionOffset, visibleRegionLength);
}
return true;
}
/**
* Hides the given range by collapsing it.
*
* @param offset the offset of the range to hide
* @param length the length of the range to hide
*/
public void collapse(int offset, int length) {
IDocument previous= getVisibleDocument();
IDocument slave= createSlaveDocument(previous);
if (slave instanceof ProjectionDocument) {
StyledText textWidget= getTextWidget();
try {
if (textWidget != null)
textWidget.setRedraw(false);
int topIndex= getTopIndex();
Point selection= getSelectedRange();
// adapt selection
int selectionEnd= selection.x + selection.y;
if (offset < selectionEnd && selectionEnd <= offset + length) {
int lineEnd= offset;
try {
IDocument document= getDocument();
int line= document.getLineOfOffset(offset);
IRegion lineInfo= document.getLineInformation(Math.max(line -1, 0));
lineEnd= lineInfo.getOffset() + lineInfo.getLength();
} catch (BadLocationException x) {
}
if (offset <= selection.x && selection.x < offset + length) {
selection.x= lineEnd;
selection.y= 0;
} else {
selection.y= Math.max(lineEnd - selection.x, 0);
}
} else if (offset <= selection.x && selection.x < offset + length) {
int delta= offset + length - selection.x;
selection.x= offset + length;
selection.y -= delta;
}
((ProjectionDocument) slave).hide(offset, length);
setVisibleDocument(slave);
setSelectedRange(selection.x, selection.y);
setTopIndex(topIndex);
} finally {
if(textWidget != null)
textWidget.setRedraw(true);
}
}
}
/**
* Makes all hidden ranges in the given range visible again.
*
* @param offset the offset of the range
* @param length the length of the range
*/
public void expand(int offset, int length) {
if (getVisibleDocument() instanceof ProjectionDocument) {
ProjectionDocument document= (ProjectionDocument) getVisibleDocument();
StyledText textWidget= getTextWidget();
try {
if (textWidget != null)
textWidget.setRedraw(false);
Point selection= getSelectedRange();
int topIndex= getTopIndex();
document.show(offset, length);
setVisibleDocument(document);
setSelectedRange(selection.x, selection.y);
setTopIndex(topIndex);
} finally {
if (textWidget != null)
textWidget.setRedraw(true);
}
}
}
/*
* @see org.eclipse.jface.text.ITextViewer#getVisibleRegion()
*/
public IRegion getVisibleRegion() {
return null;
}
/*
* @see org.eclipse.jface.text.TextViewer#getVisibleRegionOffset()
*/
protected int getVisibleRegionOffset() {
return -1;
}
/*
* @see org.eclipse.jface.text.TextViewer#internalGetVisibleRegion()
*/
protected IRegion internalGetVisibleRegion() {
return null;
}
/*
* @see org.eclipse.jface.text.ITextViewer#overlapsWithVisibleRegion(int,int)
*/
public boolean overlapsWithVisibleRegion(int offset, int length) {
return false;
}
/*
* @see org.eclipse.jface.text.TextViewer#getVisibleDocument()
*/
public IDocument getVisibleDocument() {
return super.getVisibleDocument();
}
/*
* @see org.eclipse.jface.text.TextViewer#handleVerifyEvent(org.eclipse.swt.events.VerifyEvent)
*/
protected void handleVerifyEvent(VerifyEvent e) {
IRegion modelRange= event2ModelRange(e);
Iterator iterator= fProjectionAnnotationModel.getAnnotationIterator();
while (iterator.hasNext()) {
ProjectionAnnotation annotation= (ProjectionAnnotation) iterator.next();
if (annotation.isFolded()) {
Position position= fProjectionAnnotationModel.getPosition(annotation);
if (position.overlapsWith(modelRange.getOffset(), modelRange.getLength()) /* || is a delete at the boundary */ ) {
e.doit= false;
annotation.run(this);
}
}
}
}
}
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