de.flapdoodle.wicket.behavior.VisibilityBehavior.java Source code

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Here is the source code for de.flapdoodle.wicket.behavior.VisibilityBehavior.java

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/**
 * Copyright (C) 2011
 *   Michael Mosmann <michael@mosmann.de>
 *   Jan Bernitt <unknown@email.de>
 *
 * with contributions from
 *    nobody yet
 *
 * Licensed under the Apache 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.apache.org/licenses/LICENSE-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 de.flapdoodle.wicket.behavior;

import org.apache.wicket.Component;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.model.IModel;

/**
 * changes visibility of a component based on a model value 
 * @author mosmann
 */
public class VisibilityBehavior extends Behavior {

    private final IModel<? extends Boolean> _model;

    public VisibilityBehavior(IModel<? extends Boolean> model) {
        _model = model;
    }

    @Override
    public void onConfigure(Component component) {
        super.onConfigure(component);

        Boolean visible = _model.getObject();
        component.setVisible(visible != null ? visible : false);
    }

    @Override
    public void detach(Component component) {
        super.detach(component);
        _model.detach();
    }
}