src/java.desktop/share/classes/java/awt/peer/ContainerPeer.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package java.awt.peer;

import java.awt.*;

/**
 * The peer interface for {@link Container}. This is the parent interface
 * for all container like widgets.
 *
 * The peer interfaces are intended only for use in porting
 * the AWT. They are not intended for use by application
 * developers, and developers should not implement peers
 * nor invoke any of the peer methods directly on the peer
 * instances.
 */
public interface ContainerPeer extends ComponentPeer {

    /**
     * Returns the insets of this container. Insets usually is the space that
     * is occupied by things like borders.
     *
     * @return the insets of this container
     */
    Insets getInsets();

    /**
     * Notifies the peer that validation of the component tree is about to
     * begin.
     *
     * @see Container#validate()
     */
    void beginValidate();

    /**
     * Notifies the peer that validation of the component tree is finished.
     *
     * @see Container#validate()
     */
    void endValidate();

    /**
     * Notifies the peer that layout is about to begin. This is called
     * before the container itself and its children are laid out.
     *
     * @see Container#validateTree()
     */
    void beginLayout();

    /**
     * Notifies the peer that layout is finished. This is called after the
     * container and its children have been laid out.
     *
     * @see Container#validateTree()
     */
    void endLayout();
}