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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      */
getInsets()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      */
beginValidate()55     void beginValidate();
56 
57     /**
58      * Notifies the peer that validation of the component tree is finished.
59      *
60      * @see Container#validate()
61      */
endValidate()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      */
beginLayout()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      */
endLayout()78     void endLayout();
79 }
80