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Java > Open Source Codes > com > google > gwt > user > client > ui > IndexedPanel


1 /*
2  * Copyright 2006 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5  * use this file except in compliance with the License. You may obtain a copy of
6  * the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13  * License for the specific language governing permissions and limitations under
14  * the License.
15  */
16 package com.google.gwt.user.client.ui;
17
18 /**
19  * A panel that imposes an explicit ordering on its children.
20  */
21 public interface IndexedPanel {
22
23   /**
24    * Gets the child widget at the specified index.
25    *
26    * @param index the child widget's index
27    * @return the child widget
28    */
29   Widget getWidget(int index);
30
31   /**
32    * Gets the number of child widgets in this panel.
33    *
34    * @return the number of children
35    */
36   int getWidgetCount();
37
38   /**
39    * Gets the index of the specified child widget.
40    *
41    * @param child the widget to be found
42    * @return the widget's index, or <code>-1</code> if it is not a child of
43    * this panel
44    */
45   int getWidgetIndex(Widget child);
46
47   /**
48    * Removes the widget at the specified index.
49    *
50    * @param index the index of the widget to be removed
51    * @return <code>false</code> if the widget is not present
52    */
53   boolean remove(int index);
54 }
55
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