Package org.apache.wicket.extensions.markup.html.repeater.tree

Source Code of org.apache.wicket.extensions.markup.html.repeater.tree.Node$StyleBehavior

/*
* 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.apache.wicket.extensions.markup.html.repeater.tree;

import org.apache.wicket.Component;
import org.apache.wicket.MarkupContainer;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.markup.html.AjaxFallbackLink;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.core.util.string.CssUtils;
import org.apache.wicket.extensions.markup.html.repeater.tree.AbstractTree.State;
import org.apache.wicket.markup.ComponentTag;
import org.apache.wicket.markup.html.panel.Panel;
import org.apache.wicket.model.IModel;

/**
* Representation of a single node in the tree. By default uses an {@link AjaxFallbackLink} for its
* junction component.
*
* @see #createJunctionComponent(String)
*
* @author svenmeier
* @param <T>
*            The model object type
*/
public abstract class Node<T> extends Panel
{

  private static final long serialVersionUID = 1L;

  public static final String OTHER_CLASS_KEY = CssUtils.key(Node.class, "other");

  public static final String EXPANDED_CLASS_KEY = CssUtils.key(Node.class, "expanded");

  public static final String COLLAPSED_CLASS_KEY = CssUtils.key(Node.class, "collapsed");

  /**
   * The component id for the content component.
   */
  public static final String CONTENT_ID = "content";

  private AbstractTree<T> tree;

  /**
   * Constructor.
   *
   * @param id
   *            component id
   * @param tree
   *            the owning tree
   * @param model
   *            the model for this node
   */
  public Node(String id, AbstractTree<T> tree, IModel<T> model)
  {
    super(id, model);

    this.tree = tree;

    MarkupContainer junction = createJunctionComponent("junction");
    junction.add(new StyleBehavior());
    add(junction);

    Component content = createContent(CONTENT_ID, model);
    if (!content.getId().equals(CONTENT_ID))
    {
      throw new IllegalArgumentException(
        "content must have component id equal to Node.CONTENT_ID");
    }
    add(content);
  }

  /**
   * @return the model
   */
  @SuppressWarnings("unchecked")
  public IModel<T> getModel()
  {
    return (IModel<T>)getDefaultModel();
  }

  /**
   * @return the model object
   */
  public T getModelObject()
  {
    return getModel().getObject();
  }

  /**
   * The junction component expands and collapses this node.
   *
   * @param id
   *            the component id
   * @return component representing the junction
   */
  protected MarkupContainer createJunctionComponent(String id)
  {
    return new AjaxFallbackLink<Void>(id)
    {
      private static final long serialVersionUID = 1L;

      @Override
      public void onClick(AjaxRequestTarget target)
      {
        toggle();
      }

      @Override
      public boolean isEnabled()
      {
        return tree.getProvider().hasChildren(Node.this.getModelObject());
      }
    };
  }

  /**
   * Toggle the node.
   *
   * @see AbstractTree#collapse(Object)
   * @see AbstractTree#expand(Object)
   */
  protected void toggle()
  {
    T t = getModelObject();

    if (tree.getState(t) == State.EXPANDED)
    {
      tree.collapse(t);
    }
    else
    {
      tree.expand(t);
    }
  }

  /**
   * Create the component to display the actual node's content.
   *
   * @param id
   *            the component id
   * @param model
   *            the node's model
   * @return the component representing the content
   */
  protected abstract Component createContent(String id, IModel<T> model);

  /**
   * Get the style class depending on the current {@link State} of this node.
   *
   * @see #getExpandedStyleClass(Object)
   * @see #getCollapsedStyleClass()
   * @see #getOtherStyleClass()
   * @return the style class
   */
  protected String getStyleClass()
  {
    T t = getModelObject();

    if (tree.getProvider().hasChildren(t))
    {
      if (tree.getState(t) == State.EXPANDED)
      {
        return getExpandedStyleClass(t);
      }
      else
      {
        return getCollapsedStyleClass();
      }
    }
    return getOtherStyleClass();
  }

  protected String getExpandedStyleClass(T t)
  {
    return getString(EXPANDED_CLASS_KEY);
  }

  protected String getCollapsedStyleClass()
  {
    return getString(COLLAPSED_CLASS_KEY);
  }

  protected String getOtherStyleClass()
  {
    return getString(OTHER_CLASS_KEY);
  }

  /**
   * Behavior to add the style class attribute.
   *
   * @see Node#getStyleClass()
   */
  private static class StyleBehavior extends Behavior
  {
    private static final long serialVersionUID = 1L;

    @Override
    public void onComponentTag(Component component, ComponentTag tag)
    {
      Node<?> node = (Node<?>)component.getParent();

      String styleClass = node.getStyleClass();
      if (styleClass != null)
      {
        tag.put("class", styleClass);
      }
    }
  }
}
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