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/*******************************************************************************
* Copyright (c) 2017 Red Hat Inc. and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Mickael Istria (Red Hat Inc.) - initial implementation
*******************************************************************************/
package org.eclipse.ui.internal.genericeditor.markers;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.resources.IMarker;
import org.eclipse.jface.text.IInformationControlCreator;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextHover;
import org.eclipse.jface.text.ITextHoverExtension;
import org.eclipse.jface.text.ITextHoverExtension2;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.Position;
import org.eclipse.jface.text.Region;
import org.eclipse.jface.text.source.Annotation;
import org.eclipse.jface.text.source.IAnnotationModel;
import org.eclipse.jface.text.source.ISourceViewerExtension2;
import org.eclipse.ui.editors.text.EditorsUI;
import org.eclipse.ui.texteditor.AnnotationPreference;
import org.eclipse.ui.texteditor.MarkerAnnotation;
public class MarkerAnnotationHover implements ITextHoverExtension, ITextHoverExtension2, ITextHover {
protected static boolean isIncluded(Annotation annotation) {
if (!(annotation instanceof MarkerAnnotation)) {
return false;
}
AnnotationPreference preference= EditorsUI.getAnnotationPreferenceLookup().getAnnotationPreference(annotation);
if (preference == null) {
return false;
}
String key= preference.getTextPreferenceKey();
if (key != null) {
if (!EditorsUI.getPreferenceStore().getBoolean(key))
return false;
} else {
key= preference.getHighlightPreferenceKey();
if (key == null || !EditorsUI.getPreferenceStore().getBoolean(key))
return false;
}
return true;
}
@Override
public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
Object hoverInfo = getHoverInfo2(textViewer, hoverRegion);
if (hoverInfo == null) {
return null;
}
return hoverInfo.toString();
}
@Override
public IRegion getHoverRegion(ITextViewer textViewer, int offset) {
if (!(textViewer instanceof ISourceViewerExtension2)) {
return null;
}
ISourceViewerExtension2 viewer = (ISourceViewerExtension2)textViewer;
List<MarkerAnnotation> annotations = findMarkerAnnotations(viewer, new Region(offset, 0));
if (annotations.isEmpty()) {
return null;
}
// find intersection of regions
int highestOffsetStart = 0;
int lowestOffsetEnd = Integer.MAX_VALUE;
IAnnotationModel annotationModel = viewer.getVisualAnnotationModel();
for (Annotation annotation : annotations) {
Position position = annotationModel.getPosition(annotation);
highestOffsetStart = Math.max(highestOffsetStart, position.getOffset());
lowestOffsetEnd = Math.min(lowestOffsetEnd, position.getOffset() + position.getLength());
}
return new Region(highestOffsetStart, Math.max(0, lowestOffsetEnd - highestOffsetStart));
}
@Override
public List<IMarker> getHoverInfo2(ITextViewer textViewer, IRegion hoverRegion) {
if (!(textViewer instanceof ISourceViewerExtension2)) {
return null;
}
List<MarkerAnnotation> annotations = findMarkerAnnotations((ISourceViewerExtension2)textViewer, hoverRegion);
if (annotations.isEmpty()) {
return null;
}
List<IMarker> markers = new ArrayList<>(annotations.size());
for (MarkerAnnotation annotation : annotations) {
markers.add(annotation.getMarker());
}
return markers;
}
private static List<MarkerAnnotation> findMarkerAnnotations(ISourceViewerExtension2 viewer, IRegion region) {
List<MarkerAnnotation> res = new ArrayList<>();
IAnnotationModel annotationModel = viewer.getVisualAnnotationModel();
annotationModel.getAnnotationIterator().forEachRemaining(annotation -> {
if (isIncluded(annotation)) {
Position position = annotationModel.getPosition(annotation);
if (region.getOffset() >= position.getOffset() && region.getOffset() + region.getLength() <= position.getOffset() + position.getLength()) {
res.add((MarkerAnnotation)annotation);
}
}
});
return res;
}
@Override
public IInformationControlCreator getHoverControlCreator() {
return new MarkerHoverControlCreator();
}
}
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