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1   /*
2    * Copyright (c) 1995, 2005, Oracle and/or its affiliates. All rights reserved.
3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4    *
5    * This code is free software; you can redistribute it and/or modify it
6    * under the terms of the GNU General Public License version 2 only, as
7    * published by the Free Software Foundation.  Oracle designates this
8    * particular file as subject to the "Classpath" exception as provided
9    * by Oracle in the LICENSE file that accompanied this code.
10   *
11   * This code is distributed in the hope that it will be useful, but WITHOUT
12   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14   * version 2 for more details (a copy is included in the LICENSE file that
15   * accompanied this code).
16   *
17   * You should have received a copy of the GNU General Public License version
18   * 2 along with this work; if not, write to the Free Software Foundation,
19   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20   *
21   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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24   */
25  package java.awt.peer;
26  
27  import java.awt.*;
28  
29  /**
30   * The peer interface for {@link Container}. This is the parent interface
31   * for all container like widgets.
32   *
33   * The peer interfaces are intended only for use in porting
34   * the AWT. They are not intended for use by application
35   * developers, and developers should not implement peers
36   * nor invoke any of the peer methods directly on the peer
37   * instances.
38   */
39  public interface ContainerPeer extends ComponentPeer {
40  
41      /**
42       * Returns the insets of this container. Insets usually is the space that
43       * is occupied by things like borders.
44       *
45       * @return the insets of this container
46       */
47      Insets getInsets();
48  
49      /**
50       * Notifies the peer that validation of the component tree is about to
51       * begin.
52       *
53       * @see Container#validate()
54       */
55      void beginValidate();
56  
57      /**
58       * Notifies the peer that validation of the component tree is finished.
59       *
60       * @see Container#validate()
61       */
62      void endValidate();
63  
64      /**
65       * Notifies the peer that layout is about to begin. This is called
66       * before the container itself and its children are laid out.
67       *
68       * @see Container#validateTree()
69       */
70      void beginLayout();
71  
72      /**
73       * Notifies the peer that layout is finished. This is called after the
74       * container and its children have been laid out.
75       *
76       * @see Container#validateTree()
77       */
78      void endLayout();
79  }