ontopoly.jquery.DroppableBehavior.java Source code

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Here is the source code for ontopoly.jquery.DroppableBehavior.java

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/*
 * #!
 * Ontopoly Editor
 * #-
 * Copyright (C) 2001 - 2013 The Ontopia Project
 * #-
 * 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 ontopoly.jquery;

import org.apache.wicket.Component;
import org.apache.wicket.MarkupContainer;
import org.apache.wicket.Component.IVisitor;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.behavior.AttributeAppender;
import org.apache.wicket.markup.html.IHeaderResponse;
import org.apache.wicket.model.Model;

public abstract class DroppableBehavior extends JQueryBehavior {

    protected String id;

    public DroppableBehavior(String id) {
        this.id = id;
    }

    @Override
    protected void onBind() {
        super.onBind();
        Component c = getComponent();
        c.setOutputMarkupId(true);
        c.add(new AttributeAppender("class", new Model<String>("do_" + id), " "));
    }

    public void renderHead(IHeaderResponse response) {
        super.renderHead(response);

        String markupId = getComponent().getMarkupId();
        String selector = "#" + markupId;
        String functionId = "fdo_" + markupId;

        StringBuilder sb = new StringBuilder();
        sb.append("var ").append(functionId).append(" = function() {\n");
        sb.append("  $(\"").append(selector).append("\").droppable('destroy');\n");
        sb.append("  $(\"").append(selector).append("\").droppable({\n");
        sb.append("    accept: \".dg_").append(id)
                .append("\", activeClass: 'droppable-active', hoverClass: 'droppable-hover',\n");
        sb.append("    drop: function(ev, ui) { wicketAjaxGet('").append((String) getCallbackUrl())
                .append("&id=' + $(ui.draggable).attr('id')); }\n");
        sb.append("  })\n");
        sb.append("};\n");
        sb.append("$(document).ready(function() {\n");
        sb.append("  ").append(functionId).append("();\n");
        sb.append("});");

        response.renderJavascript(sb, "jquery-do-" + markupId);
        response.renderOnLoadJavascript(
                "Wicket.Ajax.registerPostCallHandler(function(){ " + functionId + "(); });");
    }

    @Override
    protected void respond(AjaxRequestTarget target) {
        final String draggableId = getComponent().getRequest().getParameter("id");
        // find component with the markup id given in the 'id' request parameter
        MarkupIdVisitor visitor = new MarkupIdVisitor(draggableId);
        //    System.out.println("R: " + getComponent() + " " + getComponent().getParent()+ " " + getComponent().getParent().getParent());
        //    getComponent().getPage().visitChildren(visitor);
        getDropContainer().visitChildren(visitor);
        onDrop(visitor.getFoundComponent(), target);
    }

    protected abstract void onDrop(Component component, AjaxRequestTarget target);

    /**
     * Should return the container that contains all the droppable 
     * targets. This will then be used to search for the appropriate 
     * target.
     */
    protected abstract MarkupContainer getDropContainer();

    private static class MarkupIdVisitor implements IVisitor<Component> {
        private final String id;
        private Component found;

        public MarkupIdVisitor(String id) {
            this.id = id;
        }

        public Object component(Component component) {
            if (component.getMarkupId().equals(id)) {
                this.found = component;
                return IVisitor.STOP_TRAVERSAL;
            } else if (component instanceof MarkupContainer)
                return ((MarkupContainer) component).visitChildren(this);
            else
                return IVisitor.CONTINUE_TRAVERSAL;
        }

        public Component getFoundComponent() {
            return found;
        }
    }

}