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/*******************************************************************************
* Copyright (c) 2000, 2012 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
*******************************************************************************/
package org.eclipse.jface.text.presentation;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.BadPositionCategoryException;
import org.eclipse.jface.text.DefaultPositionUpdater;
import org.eclipse.jface.text.DocumentEvent;
import org.eclipse.jface.text.DocumentPartitioningChangedEvent;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IDocumentExtension3;
import org.eclipse.jface.text.IDocumentListener;
import org.eclipse.jface.text.IDocumentPartitioningListener;
import org.eclipse.jface.text.IDocumentPartitioningListenerExtension;
import org.eclipse.jface.text.IDocumentPartitioningListenerExtension2;
import org.eclipse.jface.text.IPositionUpdater;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextInputListener;
import org.eclipse.jface.text.ITextListener;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.ITextViewerExtension5;
import org.eclipse.jface.text.ITypedRegion;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.TextEvent;
import org.eclipse.jface.text.TextPresentation;
import org.eclipse.jface.text.TextUtilities;
import org.eclipse.jface.text.TypedPosition;
/**
* Standard implementation of IPresentationReconciler. This
* implementation assumes that the tasks performed by its presentation damagers
* and repairers are lightweight and of low cost. This presentation reconciler
* runs in the UI thread and always repairs the complete damage caused by a
* document change rather than just the portion overlapping with the viewer's
* viewport.
*
* Usually, clients instantiate this class and configure it before using it.
*
*/
public class PresentationReconciler implements IPresentationReconciler, IPresentationReconcilerExtension {
/** Prefix of the name of the position category for tracking damage regions. */
protected final static String TRACKED_PARTITION= "__reconciler_tracked_partition"; //$NON-NLS-1$
/**
* Internal listener class.
*/
class InternalListener implements
ITextInputListener, IDocumentListener, ITextListener,
IDocumentPartitioningListener, IDocumentPartitioningListenerExtension, IDocumentPartitioningListenerExtension2 {
/** Set to true if between a document about to be changed and a changed event. */
private boolean fDocumentChanging= false;
/**
* The cached redraw state of the text viewer.
* @since 3.0
*/
private boolean fCachedRedrawState= true;
/*
* @see ITextInputListener#inputDocumentAboutToBeChanged(IDocument, IDocument)
*/
public void inputDocumentAboutToBeChanged(IDocument oldDocument, IDocument newDocument) {
if (oldDocument != null) {
try {
fViewer.removeTextListener(this);
oldDocument.removeDocumentListener(this);
oldDocument.removeDocumentPartitioningListener(this);
oldDocument.removePositionUpdater(fPositionUpdater);
oldDocument.removePositionCategory(fPositionCategory);
} catch (BadPositionCategoryException x) {
// should not happened for former input documents;
}
}
}
/*
* @see ITextInputListener#inputDocumenChanged(IDocument, IDocument)
*/
public void inputDocumentChanged(IDocument oldDocument, IDocument newDocument) {
fDocumentChanging= false;
fCachedRedrawState= true;
if (newDocument != null) {
newDocument.addPositionCategory(fPositionCategory);
newDocument.addPositionUpdater(fPositionUpdater);
newDocument.addDocumentPartitioningListener(this);
newDocument.addDocumentListener(this);
fViewer.addTextListener(this);
setDocumentToDamagers(newDocument);
setDocumentToRepairers(newDocument);
processDamage(new Region(0, newDocument.getLength()), newDocument);
}
}
/*
* @see IDocumentPartitioningListener#documentPartitioningChanged(IDocument)
*/
public void documentPartitioningChanged(IDocument document) {
if (!fDocumentChanging && fCachedRedrawState)
processDamage(new Region(0, document.getLength()), document);
else
fDocumentPartitioningChanged= true;
}
/*
* @see IDocumentPartitioningListenerExtension#documentPartitioningChanged(IDocument, IRegion)
* @since 2.0
*/
public void documentPartitioningChanged(IDocument document, IRegion changedRegion) {
if (!fDocumentChanging && fCachedRedrawState) {
processDamage(new Region(changedRegion.getOffset(), changedRegion.getLength()), document);
} else {
fDocumentPartitioningChanged= true;
fChangedDocumentPartitions= changedRegion;
}
}
/*
* @see org.eclipse.jface.text.IDocumentPartitioningListenerExtension2#documentPartitioningChanged(org.eclipse.jface.text.DocumentPartitioningChangedEvent)
* @since 3.0
*/
public void documentPartitioningChanged(DocumentPartitioningChangedEvent event) {
IRegion changedRegion= event.getChangedRegion(getDocumentPartitioning());
if (changedRegion != null)
documentPartitioningChanged(event.getDocument(), changedRegion);
}
/*
* @see IDocumentListener#documentAboutToBeChanged(DocumentEvent)
*/
public void documentAboutToBeChanged(DocumentEvent e) {
fDocumentChanging= true;
if (fCachedRedrawState) {
try {
int offset= e.getOffset() + e.getLength();
ITypedRegion region= getPartition(e.getDocument(), offset);
fRememberedPosition= new TypedPosition(region);
e.getDocument().addPosition(fPositionCategory, fRememberedPosition);
} catch (BadLocationException x) {
// can not happen
} catch (BadPositionCategoryException x) {
// should not happen on input elements
}
}
}
/*
* @see IDocumentListener#documentChanged(DocumentEvent)
*/
public void documentChanged(DocumentEvent e) {
if (fCachedRedrawState) {
try {
e.getDocument().removePosition(fPositionCategory, fRememberedPosition);
} catch (BadPositionCategoryException x) {
// can not happen on input documents
}
}
fDocumentChanging= false;
}
/*
* @see ITextListener#textChanged(TextEvent)
*/
public void textChanged(TextEvent e) {
fCachedRedrawState= e.getViewerRedrawState();
if (!fCachedRedrawState)
return;
IRegion damage= null;
IDocument document= null;
if (e.getDocumentEvent() == null) {
document= fViewer.getDocument();
if (document != null) {
if (e.getOffset() == 0 && e.getLength() == 0 && e.getText() == null) {
// redraw state change, damage the whole document
damage= new Region(0, document.getLength());
} else {
IRegion region= widgetRegion2ModelRegion(e);
if (region != null) {
try {
String text= document.get(region.getOffset(), region.getLength());
DocumentEvent de= new DocumentEvent(document, region.getOffset(), region.getLength(), text);
damage= getDamage(de, false);
} catch (BadLocationException x) {
}
}
}
}
} else {
DocumentEvent de= e.getDocumentEvent();
document= de.getDocument();
damage= getDamage(de, true);
}
if (damage != null && document != null)
processDamage(damage, document);
fDocumentPartitioningChanged= false;
fChangedDocumentPartitions= null;
}
/**
* Translates the given text event into the corresponding range of the viewer's document.
*
* @param e the text event
* @return the widget region corresponding the region of the given event or
* null if none
* @since 2.1
*/
protected IRegion widgetRegion2ModelRegion(TextEvent e) {
String text= e.getText();
int length= text == null ? 0 : text.length();
if (fViewer instanceof ITextViewerExtension5) {
ITextViewerExtension5 extension= (ITextViewerExtension5) fViewer;
return extension.widgetRange2ModelRange(new Region(e.getOffset(), length));
}
IRegion visible= fViewer.getVisibleRegion();
IRegion region= new Region(e.getOffset() + visible.getOffset(), length);
return region;
}
}
/** The map of presentation damagers. */
private Map fDamagers;
/** The map of presentation repairers. */
private Map fRepairers;
/** The target viewer. */
private ITextViewer fViewer;
/** The internal listener. */
private InternalListener fInternalListener= new InternalListener();
/** The name of the position category to track damage regions. */
private String fPositionCategory;
/** The position updated for the damage regions' position category. */
private IPositionUpdater fPositionUpdater;
/** The positions representing the damage regions. */
private TypedPosition fRememberedPosition;
/** Flag indicating the receipt of a partitioning changed notification. */
private boolean fDocumentPartitioningChanged= false;
/** The range covering the changed partitioning. */
private IRegion fChangedDocumentPartitions= null;
/**
* The partitioning used by this presentation reconciler.
* @since 3.0
*/
private String fPartitioning;
/**
* Creates a new presentation reconciler. There are no damagers or repairers
* registered with this reconciler by default. The default partitioning
* IDocumentExtension3.DEFAULT_PARTITIONING is used.
*/
public PresentationReconciler() {
super();
fPartitioning= IDocumentExtension3.DEFAULT_PARTITIONING;
fPositionCategory= TRACKED_PARTITION + hashCode();
fPositionUpdater= new DefaultPositionUpdater(fPositionCategory);
}
/**
* Sets the document partitioning for this presentation reconciler.
*
* @param partitioning the document partitioning for this presentation reconciler.
* @since 3.0
*/
public void setDocumentPartitioning(String partitioning) {
Assert.isNotNull(partitioning);
fPartitioning= partitioning;
}
/*
* @see org.eclipse.jface.text.presentation.IPresentationReconcilerExtension#geDocumenttPartitioning()
* @since 3.0
*/
public String getDocumentPartitioning() {
return fPartitioning;
}
/**
* Registers the given presentation damager for a particular content type.
* If there is already a damager registered for this type, the old damager
* is removed first.
*
* @param damager the presentation damager to register, or null to remove an existing one
* @param contentType the content type under which to register
*/
public void setDamager(IPresentationDamager damager, String contentType) {
Assert.isNotNull(contentType);
if (fDamagers == null)
fDamagers= new HashMap();
if (damager == null)
fDamagers.remove(contentType);
else
fDamagers.put(contentType, damager);
}
/**
* Registers the given presentation repairer for a particular content type.
* If there is already a repairer registered for this type, the old repairer
* is removed first.
*
* @param repairer the presentation repairer to register, or null to remove an existing one
* @param contentType the content type under which to register
*/
public void setRepairer(IPresentationRepairer repairer, String contentType) {
Assert.isNotNull(contentType);
if (fRepairers == null)
fRepairers= new HashMap();
if (repairer == null)
fRepairers.remove(contentType);
else
fRepairers.put(contentType, repairer);
}
/*
* @see IPresentationReconciler#install(ITextViewer)
*/
public void install(ITextViewer viewer) {
Assert.isNotNull(viewer);
fViewer= viewer;
fViewer.addTextInputListener(fInternalListener);
IDocument document= viewer.getDocument();
if (document != null)
fInternalListener.inputDocumentChanged(null, document);
}
/*
* @see IPresentationReconciler#uninstall()
*/
public void uninstall() {
fViewer.removeTextInputListener(fInternalListener);
// Ensure we uninstall all listeners
fInternalListener.inputDocumentAboutToBeChanged(fViewer.getDocument(), null);
}
/*
* @see IPresentationReconciler#getDamager(String)
*/
public IPresentationDamager getDamager(String contentType) {
if (fDamagers == null)
return null;
return (IPresentationDamager) fDamagers.get(contentType);
}
/*
* @see IPresentationReconciler#getRepairer(String)
*/
public IPresentationRepairer getRepairer(String contentType) {
if (fRepairers == null)
return null;
return (IPresentationRepairer) fRepairers.get(contentType);
}
/**
* Informs all registered damagers about the document on which they will work.
*
* @param document the document on which to work
*/
protected void setDocumentToDamagers(IDocument document) {
if (fDamagers != null) {
Iterator e= fDamagers.values().iterator();
while (e.hasNext()) {
IPresentationDamager damager= (IPresentationDamager) e.next();
damager.setDocument(document);
}
}
}
/**
* Informs all registered repairers about the document on which they will work.
*
* @param document the document on which to work
*/
protected void setDocumentToRepairers(IDocument document) {
if (fRepairers != null) {
Iterator e= fRepairers.values().iterator();
while (e.hasNext()) {
IPresentationRepairer repairer= (IPresentationRepairer) e.next();
repairer.setDocument(document);
}
}
}
/**
* Constructs a "repair description" for the given damage and returns this
* description as a text presentation. For this, it queries the partitioning
* of the damage region and asks the appropriate presentation repairer for
* each partition to construct the "repair description" for this partition.
*
* @param damage the damage to be repaired
* @param document the document whose presentation must be repaired
* @return the presentation repair description as text presentation or
* null if the partitioning could not be computed
*/
protected TextPresentation createPresentation(IRegion damage, IDocument document) {
try {
if (fRepairers == null || fRepairers.isEmpty()) {
TextPresentation presentation= new TextPresentation(damage, 100);
presentation.setDefaultStyleRange(new StyleRange(damage.getOffset(), damage.getLength(), null, null));
return presentation;
}
TextPresentation presentation= new TextPresentation(damage, 1000);
ITypedRegion[] partitioning= TextUtilities.computePartitioning(document, getDocumentPartitioning(), damage.getOffset(), damage.getLength(), false);
for (int i= 0; i < partitioning.length; i++) {
ITypedRegion r= partitioning[i];
IPresentationRepairer repairer= getRepairer(r.getType());
if (repairer != null)
repairer.createPresentation(presentation, r);
}
return presentation;
} catch (BadLocationException x) {
return null;
}
}
/**
* Checks for the first and the last affected partition affected by a
* document event and calls their damagers. Invalidates everything from the
* start of the damage for the first partition until the end of the damage
* for the last partition.
*
* @param e the event describing the document change
* @param optimize true if partition changes should be
* considered for optimization
* @return the damaged caused by the change or null if
* computing the partitioning failed
* @since 3.0
*/
private IRegion getDamage(DocumentEvent e, boolean optimize) {
int length= e.getText() == null ? 0 : e.getText().length();
if (fDamagers == null || fDamagers.isEmpty()) {
length= Math.max(e.getLength(), length);
length= Math.min(e.getDocument().getLength() - e.getOffset(), length);
return new Region(e.getOffset(), length);
}
boolean isDeletion= length == 0;
IRegion damage= null;
try {
int offset= e.getOffset();
if (isDeletion)
offset= Math.max(0, offset - 1);
ITypedRegion partition= getPartition(e.getDocument(), offset);
IPresentationDamager damager= getDamager(partition.getType());
if (damager == null)
return null;
IRegion r= damager.getDamageRegion(partition, e, fDocumentPartitioningChanged);
if (!fDocumentPartitioningChanged && optimize && !isDeletion) {
damage= r;
} else {
int damageStart= r.getOffset();
int damageEnd= getDamageEndOffset(e);
if (fChangedDocumentPartitions != null) {
damageStart= Math.min(damageStart, fChangedDocumentPartitions.getOffset());
damageEnd= Math.max(damageEnd, fChangedDocumentPartitions.getOffset() + fChangedDocumentPartitions.getLength());
}
damage= damageEnd == -1 ? r : new Region(damageStart, damageEnd - damageStart);
}
} catch (BadLocationException x) {
}
return damage;
}
/**
* Returns the end offset of the damage. If a partition has been split by
* the given document event also the second half of the original
* partition must be considered. This is achieved by using the remembered
* partition range.
*
* @param e the event describing the change
* @return the damage end offset (excluding)
* @exception BadLocationException if method accesses invalid offset
*/
private int getDamageEndOffset(DocumentEvent e) throws BadLocationException {
IDocument d= e.getDocument();
int length= 0;
if (e.getText() != null) {
length= e.getText().length();
if (length > 0)
-- length;
}
ITypedRegion partition= getPartition(d, e.getOffset() + length);
int endOffset= partition.getOffset() + partition.getLength();
if (endOffset == e.getOffset())
return -1;
int end= fRememberedPosition == null ? -1 : fRememberedPosition.getOffset() + fRememberedPosition.getLength();
if (endOffset < end && end < d.getLength())
partition= getPartition(d, end);
IPresentationDamager damager= getDamager(partition.getType());
if (damager == null)
return -1;
IRegion r= damager.getDamageRegion(partition, e, fDocumentPartitioningChanged);
return r.getOffset() + r.getLength();
}
/**
* Processes the given damage.
* @param damage the damage to be repaired
* @param document the document whose presentation must be repaired
*/
private void processDamage(IRegion damage, IDocument document) {
if (damage != null && damage.getLength() > 0) {
TextPresentation p= createPresentation(damage, document);
if (p != null)
applyTextRegionCollection(p);
}
}
/**
* Applies the given text presentation to the text viewer the presentation
* reconciler is installed on.
*
* @param presentation the text presentation to be applied to the text viewer
*/
private void applyTextRegionCollection(TextPresentation presentation) {
fViewer.changeTextPresentation(presentation, false);
}
/**
* Returns the partition for the given offset in the given document.
*
* @param document the document
* @param offset the offset
* @return the partition
* @throws BadLocationException if offset is invalid in the given document
* @since 3.0
*/
private ITypedRegion getPartition(IDocument document, int offset) throws BadLocationException {
return TextUtilities.getPartition(document, getDocumentPartitioning(), offset, false);
}
}
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