org.sakaiproject.sitestats.tool.wicket.components.IndicatingAjaxRadioGroup.java Source code

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Here is the source code for org.sakaiproject.sitestats.tool.wicket.components.IndicatingAjaxRadioGroup.java

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/**
 * $URL$
 * $Id$
 *
 * Copyright (c) 2006-2009 The Sakai Foundation
 *
 * Licensed under the Educational Community License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *             http://www.opensource.org/licenses/ECL-2.0
 *
 * 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 org.sakaiproject.sitestats.tool.wicket.components;

import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.IAjaxIndicatorAware;
import org.apache.wicket.ajax.form.AjaxFormChoiceComponentUpdatingBehavior;
import org.apache.wicket.behavior.AbstractAjaxBehavior;
import org.apache.wicket.extensions.ajax.markup.html.AjaxIndicatorAppender;
import org.apache.wicket.markup.html.form.RadioGroup;
import org.apache.wicket.model.IModel;

public abstract class IndicatingAjaxRadioGroup extends RadioGroup implements IAjaxIndicatorAware {
    private static final long serialVersionUID = 1L;
    private AbstractAjaxBehavior ajaxUpdatingBehavior;
    private Object forModelObjectOnly;
    private AjaxIndicatorAppender indicatorAppender = new AjaxIndicatorAppender();

    public IndicatingAjaxRadioGroup(final String id) {
        this(id, null, null, false);
    }

    public IndicatingAjaxRadioGroup(final String id, final Object forModelObjectOnly, final boolean lazyLoadData) {
        this(id, null, forModelObjectOnly, lazyLoadData);
    }

    public IndicatingAjaxRadioGroup(final String id, final IModel model, final Object forModelObjectOnly,
            final boolean lazyLoadData) {
        super(id, model);
        setOutputMarkupId(true);

        if (lazyLoadData) {
            this.forModelObjectOnly = forModelObjectOnly;
            add(indicatorAppender);
            ajaxUpdatingBehavior = new AjaxFormChoiceComponentUpdatingBehavior() {
                private static final long serialVersionUID = 1L;

                @Override
                protected void onUpdate(AjaxRequestTarget target) {
                    if (forModelObjectOnly != null && forModelObjectOnly.equals(getModelObject())) {
                        IndicatingAjaxRadioGroup.this.onUpdate(target);
                    }
                }
            };
            add(ajaxUpdatingBehavior);
        }
    }

    public void removeAjaxUpdatingBehavior() {
        if (getBehaviors().contains(ajaxUpdatingBehavior)) {
            remove(ajaxUpdatingBehavior);
        }
    }

    /**
     * Listener method invoked on an ajax update call
     * @param target
     */
    protected abstract void onUpdate(AjaxRequestTarget target);

    public String getAjaxIndicatorMarkupId() {
        if (forModelObjectOnly != null && forModelObjectOnly.equals(getModelObject())) {
            return indicatorAppender.getMarkupId();
        } else {
            return null;
        }
    }

}