org.polymap.rhei.batik.toolkit.md.CheckboxActionProvider.java Source code

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Here is the source code for org.polymap.rhei.batik.toolkit.md.CheckboxActionProvider.java

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/* 
 * polymap.org
 * Copyright (C) 2015, Falko Brutigam. All rights reserved.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 3.0 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 */
package org.polymap.rhei.batik.toolkit.md;

import static org.polymap.rhei.batik.app.SvgImageRegistryHelper.NORMAL24;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.eclipse.swt.graphics.Image;

import org.eclipse.jface.viewers.ViewerCell;

import org.polymap.rhei.batik.BatikPlugin;

/**
 * 
 *
 * @author <a href="http://www.polymap.de">Falko Brutigam</a>
 */
public abstract class CheckboxActionProvider extends ActionProvider {

    private static Log log = LogFactory.getLog(CheckboxActionProvider.class);

    private Image selectedImage = BatikPlugin.images().svgImage("checkbox-marked.svg", NORMAL24);

    private Image unselectedImage = BatikPlugin.images().svgImage("checkbox-blank-outline.svg", NORMAL24);

    private Map<Object, Boolean> selected = new HashMap(32);

    public CheckboxActionProvider() {
    }

    public CheckboxActionProvider(Image selectedImage, Image unselectedImage) {
        this.selectedImage = selectedImage;
        this.unselectedImage = unselectedImage;
    }

    public boolean isSelected(Object elm) {
        return selected.get(elm);
    }

    public void setSelected(Object elm, boolean selected) {
        this.selected.put(elm, selected);
    }

    protected abstract boolean initSelection(MdListViewer viewer, Object elm);

    protected abstract void onSelection(MdListViewer viewer, Object elm,
            @SuppressWarnings("hiding") boolean selected);

    @Override
    public void update(ViewerCell cell) {
        if (!selected.containsKey(cell.getElement())) {
            selected.put(cell.getElement(), initSelection(null, cell.getElement()));
        }
        cell.setImage(selected.get(cell.getElement()) ? selectedImage : unselectedImage);
    }

    /**
     * This default implementation updates the {@link #isSelected()} state and
     * the image according to this new state. Override
     */
    @Override
    public void perform(MdListViewer viewer, Object elm) {
        selected.put(elm, !selected.get(elm));
        viewer.update(elm, null);
        onSelection(viewer, elm, isSelected(elm));
    }

}