org.eclipse.ui.internal.dialogs.cpd.GrayOutUnavailableLabelProvider.java Source code

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Here is the source code for org.eclipse.ui.internal.dialogs.cpd.GrayOutUnavailableLabelProvider.java

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/*******************************************************************************
 * Copyright (c) 2000, 2015 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
 *     Andrey Loskutov <loskutov@gmx.de> - Bug 420956
 *     Lars Vogel <Lars.Vogel@vogella.com> - Bug 472654
 *******************************************************************************/
package org.eclipse.ui.internal.dialogs.cpd;

import java.util.HashSet;
import java.util.Set;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.IColorProvider;
import org.eclipse.jface.viewers.ViewerFilter;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.internal.dialogs.cpd.CustomizePerspectiveDialog.ActionSet;
import org.eclipse.ui.internal.dialogs.cpd.CustomizePerspectiveDialog.DisplayItem;

/**
 * A label provider which takes the default label provider in the
 * TreeManager, and adds on functionality to gray out text and icons of
 * contribution items whose action sets are unavailable.
 *
 * @since 3.5
 *
 */
class GrayOutUnavailableLabelProvider extends TreeManager.TreeItemLabelProvider implements IColorProvider {
    private Display display;
    private ViewerFilter filter;
    private Set<Image> toDispose;

    public GrayOutUnavailableLabelProvider(ViewerFilter filter) {
        this.display = PlatformUI.getWorkbench().getDisplay();
        this.filter = filter;
        toDispose = new HashSet<>();
    }

    @Override
    public Color getBackground(Object element) {
        return null;
    }

    @Override
    public Color getForeground(Object element) {
        if (element instanceof DisplayItem) {
            if (!CustomizePerspectiveDialog.isEffectivelyAvailable((DisplayItem) element, filter)) {
                return display.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
            }
        }
        if (element instanceof ActionSet) {
            if (!((ActionSet) element).isActive()) {
                return display.getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
            }
        }
        return null;
    }

    @Override
    public Image getImage(Object element) {
        Image actual = super.getImage(element);

        if (element instanceof DisplayItem && actual != null) {
            DisplayItem item = (DisplayItem) element;
            if (!CustomizePerspectiveDialog.isEffectivelyAvailable(item, filter)) {
                ImageDescriptor original = ImageDescriptor.createFromImage(actual);
                ImageDescriptor disable = ImageDescriptor.createWithFlags(original, SWT.IMAGE_DISABLE);
                Image newImage = disable.createImage();
                toDispose.add(newImage);
                return newImage;
            }
        }

        return actual;
    }

    @Override
    public void dispose() {
        for (Image image : toDispose) {
            image.dispose();
        }
        toDispose.clear();
        super.dispose();
    }
}