n3phele.client.widgets.SensitiveCheckBoxCell.java Source code

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Here is the source code for n3phele.client.widgets.SensitiveCheckBoxCell.java

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/**
 * @author Nigel Cook
 *
 * (C) Copyright 2010-2012. Nigel Cook. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 * 
 * Licensed under the terms described in LICENSE file that accompanied this code, (the "License"); you may not use this file
 * except in compliance with the License. 
 * 
 *  Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on 
 *  an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the 
 *  specific language governing permissions and limitations under the License.
 */
package n3phele.client.widgets;

import com.google.gwt.cell.client.Cell;
import com.google.gwt.cell.client.CheckboxCell;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
import com.google.gwt.safehtml.shared.SafeHtmlUtils;

/**
 * A {@link Cell} used to render a checkbox. The value of the checkbox may be
 * toggled using the ENTER key as well as via mouse click.
 */
public class SensitiveCheckBoxCell extends CheckboxCell {

    private static final SafeHtml INPUT_DISABLED = SafeHtmlUtils
            .fromSafeConstant("<input type=\"checkbox\" disabled=disabled tabindex=\"-1\"/>");

    public SensitiveCheckBoxCell() {
        super();
    }

    /**
     * @param dependsOnSelection
     * @param handlesSelection
     */
    public SensitiveCheckBoxCell(boolean dependsOnSelection, boolean handlesSelection) {
        super(dependsOnSelection, handlesSelection);
    }

    @Override
    public void render(Context context, Boolean value, SafeHtmlBuilder sb) {
        // Get the view data.
        Object key = context.getKey();
        Boolean viewData = getViewData(key);
        if (viewData != null && viewData.equals(value)) {
            clearViewData(key);
            viewData = null;
        }

        if (value == null) {
            sb.append(INPUT_DISABLED);
        } else {
            super.render(context, value, sb);
        }
    }
}