/*******************************************************************************
 * Copyright (c) 2000, 2010 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.python.pydev.shared_ui.search;

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.StyledString.Styler;
import org.eclipse.jface.viewers.ViewerColumn;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.IWorkbenchPreferenceConstants;
import org.eclipse.ui.PlatformUI;

/**
 * Copy from org.eclipse.search.internal.ui.text.DecoratingFileSearchLabelProvider
 */
public class DecoratingFileSearchLabelProvider extends DecoratingStyledCellLabelProvider
        implements IPropertyChangeListener, ILabelProvider {

    private static final String HIGHLIGHT_BG_COLOR_NAME = "org.eclipse.search.ui.match.highlight"; //$NON-NLS-1$

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

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

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

        setOwnerDrawEnabled(showColoredLabels());

        super.initialize(viewer, column);
    }

    @Override
    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();
        }
    }

    @Override
    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);
    }

    @Override
    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() {
                @Override
                public void run() {
                    refresh();
                }
            });
        }
    }

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

}
