org.eclipse.search/search/org/eclipse/search/internal/ui/text/DecoratingFileSearchLabelProvider.java

/*******************************************************************************
 * 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
 *******************************************************************************/
package org.eclipse.search.internal.ui.text;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.widgets.Display;

import org.eclipse.jface.preference.JFacePreferences;
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.ILabelProvider;
import org.eclipse.jface.viewers.StyledString;
import org.eclipse.jface.viewers.ViewerColumn;
import org.eclipse.jface.viewers.StyledString.Styler;

import org.eclipse.ui.IWorkbenchPreferenceConstants;
import org.eclipse.ui.PlatformUI;

public class DecoratingFileSearchLabelProvider extends DecoratingStyledCellLabelProvider implements IPropertyChangeListener, ILabelProvider {

	private static final String HIGHLIGHT_BG_COLOR_NAME= "org.eclipse.jdt.ui.ColoredLabels.match_highlight"; //$NON-NLS-1$

	public static final Styler HIGHLIGHT_STYLE= StyledString.createColorRegistryStyler(null, HIGHLIGHT_BG_COLOR_NAME);

	public DecoratingFileSearchLabelProvider(FileLabelProvider provider) {
		super(provider, PlatformUI.getWorkbench().getDecoratorManager().getLabelDecorator(), null);
	}

	public void initialize(ColumnViewer viewer, ViewerColumn column) {
		PlatformUI.getPreferenceStore().addPropertyChangeListener(this);
		JFaceResources.getColorRegistry().addListener(this);

		setOwnerDrawEnabled(showColoredLabels());

		super.initialize(viewer, column);
	}

	public void dispose() {
		super.dispose();
		PlatformUI.getPreferenceStore().removePropertyChangeListener(this);
		JFaceResources.getColorRegistry().removeListener(this);
	}

	private void refresh() {
		ColumnViewer viewer= getViewer();

		if (viewer == null) {
			return;
		}
		boolean showColoredLabels= showColoredLabels();
		if (showColoredLabels != isOwnerDrawEnabled()) {
			setOwnerDrawEnabled(showColoredLabels);
			viewer.refresh();
		} else if (showColoredLabels) {
			viewer.refresh();
		}
	}

	protected StyleRange prepareStyleRange(StyleRange styleRange, boolean applyColors) {
		if (!applyColors && styleRange.background != null) {
			styleRange= super.prepareStyleRange(styleRange, applyColors);
			styleRange.borderStyle= SWT.BORDER_DOT;
			return styleRange;
		}
		return super.prepareStyleRange(styleRange, applyColors);
	}

	public static boolean showColoredLabels() {
		return PlatformUI.getPreferenceStore().getBoolean(IWorkbenchPreferenceConstants.USE_COLORED_LABELS);
	}

	public void propertyChange(PropertyChangeEvent event) {
		String property= event.getProperty();
		if (property.equals(JFacePreferences.QUALIFIER_COLOR) || property.equals(JFacePreferences.COUNTER_COLOR) || property.equals(JFacePreferences.DECORATIONS_COLOR)
				|| property.equals(HIGHLIGHT_BG_COLOR_NAME) || property.equals(IWorkbenchPreferenceConstants.USE_COLORED_LABELS)) {
			Display.getDefault().asyncExec(new Runnable() {
				public void run() {
					refresh();
				}
			});
		}
	}

	public String getText(Object element) {
		return getStyledText(element).getString();
	}


}