brix.codepress.CodePressEnabler.java Source code

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Here is the source code for brix.codepress.CodePressEnabler.java

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/**
 * 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 brix.codepress;

import java.util.List;

import org.apache.wicket.Component;
import org.apache.wicket.ajax.WicketEventJQueryResourceReference;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.JavaScriptHeaderItem;
import org.apache.wicket.markup.head.OnDomReadyHeaderItem;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.FormComponent;
import org.apache.wicket.request.Url;
import org.apache.wicket.request.cycle.RequestCycle;
import org.apache.wicket.request.resource.JavaScriptResourceReference;

public class CodePressEnabler extends Behavior {
    private final String language;
    private final boolean lineNumbers;
    private Component owner;

    private static final JavaScriptResourceReference JS = new JavaScriptResourceReference(CodePressEnabler.class,
            "codepress.js");

    public CodePressEnabler(String language, boolean lineNumbers) {
        this.language = language;
        this.lineNumbers = lineNumbers;
    }

    @Override
    public void bind(Component component) {
        if (owner != null) {
            throw new IllegalStateException("This behavior is already bound to a component");
        }
        // TODO validate markup id of owner will not contain any funky
        // characters
        // because codepress creates a javascript variable whose name is the
        // html id attribute
        owner = component;
        owner.setOutputMarkupId(true);
    }

    @Override
    public void beforeRender(Component component) {
        if (component instanceof FormComponent) {
            ((FormComponent<?>) component).getForm().getRootForm().setOutputMarkupId(true);
        }
    }

@Override
public void renderHead(Component component, IHeaderResponse response)
{
    response.renderJavaScriptReference(JS);
    response.renderJavaScript(codePressInitializer(), "codePressInitializer");

    if (owner instanceof FormComponent)
    {
        response.renderJavaScriptReference(WicketEventReference.INSTANCE);
        final FormComponent<?> fc = (FormComponent<?>)component;
        final Form<?> form = fc.getForm().getRootForm();
        response.renderOnDomReadyJavaScript("Wicket.Event.add(document.getElementById('" +
                form.getMarkupId() + "'), 'submit', function() { " + fc.getMarkupId() +
                ".toggleEditor();});"));
    }
}

    private String codePressInitializer() {
        return new StringBuilder().append("CodePress.path = '").append(getCodePressPath()).append("/';\n")
                .append("if(window.attachEvent) {window.attachEvent('onload',CodePress.run);}"
                        + "else {window.addEventListener('DOMContentLoaded',CodePress.run,false);}")
                .toString();
    }

    private String getCodePressPath() {
        RequestCycle requestCycle = RequestCycle.get();
        Url urlFor = requestCycle.mapUrlFor(JS, null);
        List<String> segments = urlFor.getSegments();
        segments.remove(segments.size() - 1);
        return requestCycle.getOriginalResponse().encodeURL(requestCycle.getUrlRenderer().renderUrl(urlFor));
    }

    @Override
    public void onComponentTag(Component component, ComponentTag tag) {
        String clazz = (String) tag.getAttributes().get("class");
        clazz = (clazz == null) ? "" : clazz + " ";
        clazz += "codepress ";
        clazz += language;
        clazz += " linenumbers-";
        clazz += (lineNumbers) ? "on" : "off";
        tag.put("class", clazz);
    }
}