org.cast.isi.component.SingleSelectItem.java Source code

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Here is the source code for org.cast.isi.component.SingleSelectItem.java

Source

/*
 * Copyright 2011-2015 CAST, Inc.
 *
 * This file is part of the UDL Curriculum Toolkit:
 * see <http://udl-toolkit.cast.org>.
 *
 * The UDL Curriculum Toolkit is free software: you can redistribute and/or
 * modify it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * The UDL Curriculum Toolkit 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this software.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.cast.isi.component;

import lombok.Getter;
import lombok.Setter;
import org.apache.wicket.Component;
import org.apache.wicket.ajax.AjaxEventBehavior;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.form.FormComponentLabel;
import org.apache.wicket.markup.html.form.Radio;
import org.apache.wicket.markup.html.form.RadioGroup;
import org.apache.wicket.model.IModel;
import org.apache.wicket.util.visit.IVisit;
import org.apache.wicket.util.visit.IVisitor;

/**
 * A simple radio button.  It can be told whether it is the correct
 * answer.
 * 
 * Not so simple anymore.  It also notifies listeners of a change event.
 * 
 * @author jbrookover
 */
public class SingleSelectItem extends WebMarkupContainer {

    private static final long serialVersionUID = 1L;

    @Getter
    @Setter
    private boolean correct = false;

    public SingleSelectItem(String id, IModel<String> model) {
        this(id, model, false);
    }

    public SingleSelectItem(String id, IModel<String> model, boolean correct) {
        super(id, model);
        this.correct = correct;
        final Radio<String> radio = new Radio<String>("radio", model);
        add(radio);
        add(new FormComponentLabel("label", radio));
        radio.add(new AjaxEventBehavior("onclick") {

            private static final long serialVersionUID = 1L;

            @Override
            protected void onEvent(AjaxRequestTarget target) {
                notifyListeners(target, SingleSelectItem.this);
            }
        });

    }

    public void notifyListeners(final AjaxRequestTarget target, final SingleSelectItem source) {
        if (target != null) {
            getPage().visitChildren(ISingleSelectItemChangeListener.class, new IVisitor<Component, Void>() {
                public void component(Component component, IVisit<Void> visit) {
                    ISingleSelectItemChangeListener listener = (ISingleSelectItemChangeListener) component;
                    listener.onSelectionChanged(target, source);
                }
            });
        }
    }

    /**
     * Is this item currently selected?
     * @return true if so
     */
    public boolean isSelected() {
        @SuppressWarnings("unchecked")
        Radio<String> radio = (Radio<String>) get("radio");
        return (radio.getDefaultModelObject().equals(findParent(RadioGroup.class).getDefaultModelObject()));
    }

    @Override
    protected void onComponentTag(ComponentTag tag) {
        super.onComponentTag(tag);
        tag.remove("correct"); // Remove correct attribute designated by XML
    }

    @SuppressWarnings("unchecked")
    public IModel<String> getModel() {
        return (IModel<String>) getDefaultModel();
    }

}