/*
 * Copyright 2011 Google Inc.
 * 
 * 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 com.google.gwt.user.client.ui;

import com.google.gwt.event.dom.client.HasScrollHandlers;

/**
 * Describes a vertical scrollbar.
 */
public interface VerticalScrollbar extends HasVerticalScrolling, HasScrollHandlers, IsWidget {

  /**
   * Get the height in pixels of the scrollable content that the scrollbar
   * controls.
   * 
   * <p>
   * This is not the same as the maximum scroll top position. The maximum scroll
   * position equals the <code>scrollHeight- offsetHeight</code>;
   * 
   * @return the scroll height
   * @see #setScrollHeight(int)
   */
  int getScrollHeight();

  /**
   * Set the height in pixels of the scrollable content that the scrollbar
   * controls.
   * 
   * <p>
   * This is not the same as the maximum scroll top position. The maximum scroll
   * position equals the <code>scrollHeight- offsetHeight</code>;
   * 
   * @param height the size height pixels
   */
  void setScrollHeight(int height);
}