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/*******************************************************************************
* Copyright (c) 2017 Red Hat Inc. 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:
* - Lucas Bullen (Red Hat Inc.)
*******************************************************************************/
package org.eclipse.ui.genericeditor.tests.contributions;
import org.eclipse.swt.custom.CaretEvent;
import org.eclipse.swt.custom.CaretListener;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.preferences.IEclipsePreferences;
import org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener;
import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent;
import org.eclipse.core.runtime.preferences.InstanceScope;
import org.eclipse.jface.text.IDocument;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ISynchronizable;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.Position;
import org.eclipse.jface.text.reconciler.DirtyRegion;
import org.eclipse.jface.text.reconciler.IReconcilingStrategy;
import org.eclipse.jface.text.reconciler.IReconcilingStrategyExtension;
import org.eclipse.jface.text.source.Annotation;
import org.eclipse.jface.text.source.IAnnotationModel;
import org.eclipse.jface.text.source.IAnnotationModelExtension;
import org.eclipse.jface.text.source.ISourceViewer;
/**
*
* This Reconciler Strategy is an example for how to override the default highlight strategy.
* It will highlight closing and opening tag names that match the current word the user is on.
*
*/
public class HighlightStrategy implements IReconcilingStrategy, IReconcilingStrategyExtension, CaretListener, IPreferenceChangeListener {
private static final String ANNOTATION_TYPE = "org.eclipse.ui.genericeditor.text"; //$NON-NLS-1$
public static final String TOGGLE_HIGHLIGHT_PREFERENCE = "org.eclipse.ui.genericeditor.togglehighlight"; //$NON-NLS-1$
public static final String GENERIC_EDITOR_BUNDLE_ID = "org.eclipse.ui.genericeditor"; //$NON-NLS-1$
private boolean enabled;
private ISourceViewer sourceViewer;
private IDocument document;
public static final String SEARCH_TERM = "'bar'";
private Annotation[] fOccurrenceAnnotations = null;
private void applyHighlights() {
if (sourceViewer == null || !enabled) {
return;
}
removeOccurrenceAnnotations();
int searchOffset = document.get().indexOf(SEARCH_TERM);
if(searchOffset == -1) {
return;
}
sourceViewer.getAnnotationModel().addAnnotation(new Annotation(ANNOTATION_TYPE, false, null),
new Position(searchOffset, 5));
}
public void install(ITextViewer viewer) {
if (!(viewer instanceof ISourceViewer)) {
return;
}
IEclipsePreferences preferences = InstanceScope.INSTANCE.getNode(GENERIC_EDITOR_BUNDLE_ID);
preferences.addPreferenceChangeListener(this);
this.enabled = preferences.getBoolean(TOGGLE_HIGHLIGHT_PREFERENCE, true);
this.sourceViewer = (ISourceViewer) viewer;
this.sourceViewer.getTextWidget().addCaretListener(this);
}
public void uninstall() {
if (sourceViewer != null) {
sourceViewer.getTextWidget().removeCaretListener(this);
}
IEclipsePreferences preferences = InstanceScope.INSTANCE.getNode(GENERIC_EDITOR_BUNDLE_ID);
preferences.removePreferenceChangeListener(this);
}
@Override
public void preferenceChange(PreferenceChangeEvent event) {
if (event.getKey().equals(TOGGLE_HIGHLIGHT_PREFERENCE)) {
this.enabled = Boolean.parseBoolean(event.getNewValue().toString());
if (enabled) {
initialReconcile();
} else {
removeOccurrenceAnnotations();
}
}
}
@Override
public void caretMoved(CaretEvent event) {
applyHighlights();
}
@Override
public void initialReconcile() {
if (sourceViewer != null) {
sourceViewer.getTextWidget().getDisplay().asyncExec(() -> {
if (sourceViewer != null) {
applyHighlights();
}
});
}
}
void removeOccurrenceAnnotations() {
IAnnotationModel annotationModel = sourceViewer.getAnnotationModel();
if (annotationModel == null || fOccurrenceAnnotations == null) {
return;
}
synchronized (getLockObject(annotationModel)) {
if (annotationModel instanceof IAnnotationModelExtension) {
((IAnnotationModelExtension) annotationModel).replaceAnnotations(fOccurrenceAnnotations, null);
} else {
for (Annotation fOccurrenceAnnotation : fOccurrenceAnnotations) {
annotationModel.removeAnnotation(fOccurrenceAnnotation);
}
}
fOccurrenceAnnotations = null;
}
}
private static Object getLockObject(IAnnotationModel annotationModel) {
if (annotationModel instanceof ISynchronizable) {
Object lock = ((ISynchronizable) annotationModel).getLockObject();
if (lock != null) {
return lock;
}
}
return annotationModel;
}
@Override
public void setDocument(IDocument document) {
this.document = document;
}
@Override
public void reconcile(DirtyRegion dirtyRegion, IRegion subRegion) {
// Do nothing
}
@Override
public void reconcile(IRegion partition) {
// Do nothing
}
@Override
public void setProgressMonitor(IProgressMonitor monitor) {
// Not used
}
}
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