name.martingeisse.wicket.experimental.codemirror.CodeMirrorBehavior.java Source code

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Here is the source code for name.martingeisse.wicket.experimental.codemirror.CodeMirrorBehavior.java

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/**
 * Copyright (c) 2010 Martin Geisse
 *
 * This file is distributed under the terms of the MIT license.
 */

package name.martingeisse.wicket.experimental.codemirror;

import org.apache.wicket.Component;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.markup.head.CssHeaderItem;
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.request.resource.CssResourceReference;
import org.apache.wicket.request.resource.JavaScriptResourceReference;
import name.martingeisse.wicket.internal.WicketHeadUtil;

/**
 * This behavior turns a text area into a CodeMirror editor.
 * 
 * TODO should clean up different newline encodings (NL, CR/NL)
 * on submit and before autocompile.
 */
public class CodeMirrorBehavior extends Behavior {

    /**
     * the mode
     */
    private final CodeMirrorMode mode;

    /**
     * Constructor.
     * @param mode the CodeMirror mode
     */
    public CodeMirrorBehavior(final CodeMirrorMode mode) {
        this.mode = mode;
    }

    /* (non-Javadoc)
     * @see org.apache.wicket.behavior.Behavior#renderHead(org.apache.wicket.Component, org.apache.wicket.markup.head.IHeaderResponse)
     */
    @Override
    public void renderHead(Component component, IHeaderResponse response) {
        response.render(
                CssHeaderItem.forReference(new CssResourceReference(CodeMirrorBehavior.class, "codemirror.css")));
        response.render(JavaScriptHeaderItem
                .forReference(new JavaScriptResourceReference(CodeMirrorBehavior.class, "codemirror.js")));
        WicketHeadUtil.includeClassJavascript(response, CodeMirrorBehavior.class);
        mode.renderResourceReferences(response);
        renderInitializerForTextArea(component, response);

        String script = "var q = $('#" + component.getMarkupId() + "'); \n"
                + "q.parents('.collapse').on('shown.bs.collapse', function(e) {q.data('codeMirrorInstance').refresh(); });";
        response.render(OnDomReadyHeaderItem.forScript(script));
    }

    /**
     * Renders a Javascript fragment to the specified header response that initializes CodeMirror in this mode for the specified text area.
     * 
     * @param textArea the text area that shall be using CodeMirror
     * @param response the response to render to
     */
    private void renderInitializerForTextArea(Component textArea, IHeaderResponse response) {
        StringBuilder builder = new StringBuilder();
        builder.append("var q = $('#").append(textArea.getMarkupId()).append("'); \n");
        builder.append("var codeMirror = q.createCodeMirrorForTextArea(");
        mode.renderModeParameter(builder);
        builder.append(", ");
        renderOptionsArgument(builder);
        builder.append("); \n");
        builder.append("q.data('codeMirrorInstance', codeMirror); ");
        response.render(OnDomReadyHeaderItem.forScript(builder.toString()));
    }

    /**
     * Renders an additional options argument for the call to createCodeMirrorForTextArea().
     * @param builder the string builder to render to
     */
    protected void renderOptionsArgument(StringBuilder builder) {
        builder.append("{}");
    }

}