org.eclipse.mylyn.internal.sandbox.search.ui.DesktopSearchLabelProvider.java Source code

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Here is the source code for org.eclipse.mylyn.internal.sandbox.search.ui.DesktopSearchLabelProvider.java

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/*******************************************************************************
 * Copyright (c) 2011 Tasktop Technologies.
 * 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:
 *     Tasktop Technologies - initial API and implementation
 *******************************************************************************/

package org.eclipse.mylyn.internal.sandbox.search.ui;

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.ViewerColumn;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.IWorkbenchPreferenceConstants;
import org.eclipse.ui.PlatformUI;

public class DesktopSearchLabelProvider extends DecoratingStyledCellLabelProvider
        implements IPropertyChangeListener {

    public DesktopSearchLabelProvider(IStyledLabelProvider labelProvider) {
        super(labelProvider, PlatformUI.getWorkbench().getDecoratorManager().getLabelDecorator(), null);
    }

    @Override
    public void initialize(ColumnViewer viewer, ViewerColumn column) {
        registerListeners();
        setOwnerDrawEnabled(coloredLabels());
        super.initialize(viewer, column);
    }

    private void registerListeners() {
        PlatformUI.getPreferenceStore().addPropertyChangeListener(this);
        JFaceResources.getColorRegistry().addListener(this);
    }

    private void deregisterListeners() {
        JFaceResources.getColorRegistry().removeListener(this);
        PlatformUI.getPreferenceStore().removePropertyChangeListener(this);
    }

    @Override
    public void dispose() {
        deregisterListeners();
        super.dispose();
    }

    private boolean coloredLabels() {
        return PlatformUI.getPreferenceStore().getBoolean(IWorkbenchPreferenceConstants.USE_COLORED_LABELS);
    }

    public void propertyChange(PropertyChangeEvent event) {
        final String property = event.getProperty();
        if (property.equals(JFacePreferences.QUALIFIER_COLOR) || property.equals(JFacePreferences.DECORATIONS_COLOR)
                || property.equals(IWorkbenchPreferenceConstants.USE_COLORED_LABELS)) {
            if (getViewer() == null || getViewer().getControl().isDisposed()) {
                return;
            }
            Display display = getViewer().getControl().getDisplay();
            display.asyncExec(new Runnable() {
                public void run() {
                    refresh();
                }
            });
        }
    }

    protected void refresh() {
        ColumnViewer viewer = getViewer();
        if (viewer != null && !viewer.getControl().isDisposed()) {
            setOwnerDrawEnabled(coloredLabels());
            viewer.refresh();
        }
    }
}