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/*******************************************************************************
* Copyright (c) 2000, 2008 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
* Perforce - enhancements for bug 319469
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.ui.search;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.jface.viewers.ColumnViewer;
import org.eclipse.jface.viewers.DecoratingStyledCellLabelProvider;
import org.eclipse.jface.viewers.IColorProvider;
import org.eclipse.jface.viewers.IDecorationContext;
import org.eclipse.jface.viewers.IFontProvider;
import org.eclipse.jface.viewers.ILabelDecorator;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.StyledCellLabelProvider;
import org.eclipse.jface.viewers.StyledString;
import org.eclipse.jface.viewers.ViewerColumn;
import org.eclipse.search.internal.ui.text.DecoratingFileSearchLabelProvider;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.IWorkbenchPreferenceConstants;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.internal.misc.StringMatcher;
import org.eclipse.ui.internal.misc.StringMatcher.Position;
/**
* Repository search styled label provider. Based on {@link DecoratingFileSearchLabelProvider}.
*
* @author Kevin Sawicki
* @see DecoratingFileSearchLabelProvider
*/
public class RepositorySearchStyledLabelProvider extends DecoratingStyledCellLabelProvider implements
IPropertyChangeListener, ILabelProvider {
/**
* Color to use to decorate matches.
*/
public static final String HIGHLIGHT_BG_COLOR_NAME = "org.eclipse.jdt.ui.ColoredLabels.match_highlight"; //$NON-NLS-1$
private static class PatternStyledLabelProvider extends StyledCellLabelProvider implements IStyledLabelProvider,
IColorProvider, IFontProvider {
private final SearchResultsLabelProvider labelProvider;
private StringMatcher matcher = null;
public PatternStyledLabelProvider(SearchResultsLabelProvider provider) {
this.labelProvider = provider;
}
/**
* Set the pattern to highlight
*
* @param pattern
*/
public void setPattern(String pattern) {
if (pattern != null && pattern.length() > 0) {
this.matcher = new StringMatcher(pattern, true, false);
} else {
this.matcher = null;
}
}
public StyledString getStyledText(Object element) {
StyledString styled = null;
String label = this.labelProvider.getText(element);
if (matcher == null || label.length() == 0) {
styled = new StyledString(label);
} else {
styled = new StyledString();
int start = 0;
int end = 0;
int length = label.length();
Position position = matcher.find(label, start, length);
while (position != null) {
end = position.getStart();
styled.append(label.substring(start, end));
start = position.getEnd();
styled.append(label.substring(end, start), DecoratingFileSearchLabelProvider.HIGHLIGHT_STYLE);
position = matcher.find(label, start, length);
}
if (start > 0 && start < length) {
styled.append(label.substring(start));
}
}
return styled;
}
public Image getImage(Object element) {
return this.labelProvider.getImage(element);
}
public Font getFont(Object element) {
return this.labelProvider.getFont(element);
}
public Color getForeground(Object element) {
return this.labelProvider.getForeground(element);
}
public Color getBackground(Object element) {
return this.labelProvider.getBackground(element);
}
}
private final ILabelProvider labelProvider;
/**
* Create a new repository search styled label provider that wraps an {@link ILabelProvider}
*
* @param labelProvider
* @param decorator
* @param decorationContext
*/
public RepositorySearchStyledLabelProvider(SearchResultsLabelProvider labelProvider, ILabelDecorator decorator,
IDecorationContext decorationContext) {
super(new PatternStyledLabelProvider(labelProvider), decorator, decorationContext);
this.labelProvider = labelProvider;
}
/**
* @see org.eclipse.jface.viewers.StyledCellLabelProvider#initialize(org.eclipse.jface.viewers.ColumnViewer,
* org.eclipse.jface.viewers.ViewerColumn)
*/
@Override
public void initialize(ColumnViewer viewer, ViewerColumn column) {
PlatformUI.getPreferenceStore().addPropertyChangeListener(this);
JFaceResources.getColorRegistry().addListener(this);
setOwnerDrawEnabled(PlatformUI.getPreferenceStore()
.getBoolean(IWorkbenchPreferenceConstants.USE_COLORED_LABELS));
super.initialize(viewer, column);
}
/**
* Get underyling label provider
*
* @return label provider
*/
public ILabelProvider getLabelProvider() {
return this.labelProvider;
}
/**
* @see org.eclipse.jface.viewers.DecoratingStyledCellLabelProvider#dispose()
*/
@Override
public void dispose() {
PlatformUI.getPreferenceStore().removePropertyChangeListener(this);
JFaceResources.getColorRegistry().removeListener(this);
this.labelProvider.dispose();
super.dispose();
}
/**
* Set the pattern to highlight
*
* @param pattern
*/
public void setPattern(String pattern) {
((PatternStyledLabelProvider) getStyledStringProvider()).setPattern(pattern);
}
/**
* Refresh the labels on viewer associated with this label provider. This method must be called on the UI-thread.
*/
protected void refresh() {
ColumnViewer viewer = getViewer();
if (viewer != null) {
boolean coloredLabels = PlatformUI.getPreferenceStore().getBoolean(
IWorkbenchPreferenceConstants.USE_COLORED_LABELS);
if (coloredLabels || coloredLabels != isOwnerDrawEnabled()) {
setOwnerDrawEnabled(coloredLabels);
viewer.refresh();
}
}
}
/**
* Schedule a refresh of this label provider. This method can be called from any thread.
*/
protected void scheduleRefresh() {
PlatformUI.getWorkbench().getDisplay().asyncExec(new Runnable() {
public void run() {
refresh();
}
});
}
/**
* @param event
*/
public void propertyChange(PropertyChangeEvent event) {
String property = event.getProperty();
if (IWorkbenchPreferenceConstants.USE_COLORED_LABELS.equals(property)
|| HIGHLIGHT_BG_COLOR_NAME.equals(property)) {
scheduleRefresh();
}
}
/**
* Get text of element from underyling label provider
*
* @see org.eclipse.jface.viewers.ILabelProvider#getText(java.lang.Object)
*/
public String getText(Object element) {
return this.labelProvider.getText(element);
}
/**
* Override preparation of style range to add border dot about highlight regions that don't have colors applied
*
* @see org.eclipse.jface.viewers.StyledCellLabelProvider#prepareStyleRange(org.eclipse.swt.custom.StyleRange,
* boolean)
*/
@Override
protected StyleRange prepareStyleRange(StyleRange styleRange, boolean applyColors) {
boolean addBorder = !applyColors && styleRange.background != null;
styleRange = super.prepareStyleRange(styleRange, applyColors);
if (addBorder) {
styleRange.borderStyle = SWT.BORDER_DOT;
}
return styleRange;
}
}
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