org.wicketstuff.minis.behavior.styleswitcher.StyleSwitcher.java Source code

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Here is the source code for org.wicketstuff.minis.behavior.styleswitcher.StyleSwitcher.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.wicketstuff.minis.behavior.styleswitcher;

import java.util.ArrayList;
import java.util.List;

import org.apache.wicket.Component;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.JavaScriptHeaderItem;
import org.apache.wicket.markup.head.StringHeaderItem;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.request.resource.JavaScriptResourceReference;
import org.apache.wicket.request.resource.ResourceReference;
import org.apache.wicket.util.io.IClusterable;

/**
 * StyleSwitcher
 * 
 * Adds a set of alternate stylesheet links to the header with title attributes. When used in
 * conjunction with {@link StyleSwitcherLink}, it easy to switch active stylesheets with the click
 * of a link.
 * 
 * Inspired by Paul Sowden's A List Apart article "Altenative Style"
 * http://alistapart.com/stories/alternate/
 * 
 * @author Tauren Mills (tauren)
 * @author Igor Vaynberg (ivaynberg at apache dot org)
 */
public class StyleSwitcher extends Behavior {
    /**
     * JavaScript access methods
     * 
     * @author Igor Vaynberg (ivaynberg at apache dot org)
     * 
     */
    public static class Javascript {
        public static String forActivatingStylesheet(final String title) {
            return "StyleSwitcher.setActiveStyleSheet('" + title + "');";
        }

        private Javascript() {
            super();
        }
    }

    private static class TitledResourceReferenceTuple implements IClusterable {
        private static final long serialVersionUID = 1L;

        private final String title;
        private final ResourceReference reference;

        public TitledResourceReferenceTuple(final String title, final ResourceReference reference) {
            this.title = title;
            this.reference = reference;
        }
    }

    private static final long serialVersionUID = 1L;

    private static final ResourceReference SS_JS = new JavaScriptResourceReference(StyleSwitcher.class,
            "styleswitcher.js");

    private final List<TitledResourceReferenceTuple> stylesheets = new ArrayList<TitledResourceReferenceTuple>();

    /**
     * Adds stylesheet to this stylesheet switcher
     * 
     * @param reference
     *            A resource reference to an alternate stylesheet
     * @param title
     *            Name of this stylesheet
     */
    public void addStylesheet(final String title, final ResourceReference reference) {
        stylesheets.add(new TitledResourceReferenceTuple(title, reference));
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void renderHead(final Component c, final IHeaderResponse response) {
        response.render(JavaScriptHeaderItem.forReference(SS_JS));

        for (final TitledResourceReferenceTuple stylesheet : stylesheets)
            response.render(
                    StringHeaderItem.forString("<link rel=\"alternate stylesheet\" type=\"text/css\" href=\""
                            + RequestCycle.get().urlFor(stylesheet.reference, null) + "\" title=\""
                            + stylesheet.title + "\"/>"));
    }
}