org.cast.cwm.components.ShyContainer.java Source code

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Here is the source code for org.cast.cwm.components.ShyContainer.java

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/*
 * Copyright 2011-2016 CAST, Inc.
 *
 * This file is part of the CAST Wicket Modules:
 * see <http://code.google.com/p/cast-wicket-modules>.
 *
 * The CAST Wicket Modules are free software: you can redistribute and/or
 * modify them 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 CAST Wicket Modules are distributed in the hope that they 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.cwm.components;

import org.apache.wicket.Component;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.util.visit.IVisit;
import org.apache.wicket.util.visit.IVisitor;

/**
 * A WebMarkupContainer that makes itself invisible whenever all immediate
 * children are invisible.
 */
public class ShyContainer extends WebMarkupContainer {

    private static final long serialVersionUID = 1L;

    public ShyContainer(String id) {
        super(id);
        setOutputMarkupId(true);
        setOutputMarkupPlaceholderTag(true);
    }

    @Override
    public boolean isVisible() {
        return someChildVisible();
    }

    private boolean someChildVisible() {
        Boolean found = this.visitChildren(new IVisitor<Component, Boolean>() {

            @Override
            public void component(Component component, final IVisit<Boolean> visit) {
                if (determineVisibility(component)) {
                    visit.stop(true);
                } else {
                    visit.dontGoDeeper();
                }
            }

            private boolean determineVisibility(Component component) {
                component.configure();
                return component.determineVisibility();
            }

        });
        return (found != null && found);
    }

}