/*

 * Copyright 1996-2001 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * 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).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package java.awt;

/**

 * Defines an interface for classes that know how to layout Containers

 * based on a layout constraints object.

 *

 * This interface extends the LayoutManager interface to deal with layouts

 * explicitly in terms of constraint objects that specify how and where

 * components should be added to the layout.

 * <p>

 * This minimal extension to LayoutManager is intended for tool

 * providers who wish to the creation of constraint-based layouts.

 * It does not yet provide full, general support for custom

 * constraint-based layout managers.

 *

 * @see LayoutManager

 * @see Container

 *

 * @author      Jonni Kanerva

 */

public interface LayoutManager2 extends LayoutManager {

    /**

     * Adds the specified component to the layout, using the specified

     * constraint object.

     * @param comp the component to be added

     * @param constraints  where/how the component is added to the layout.

     */

    void addLayoutComponent(Component comp, Object constraints);

    /**

     * Calculates the maximum size dimensions for the specified container,

     * given the components it contains.

     * @see java.awt.Component#getMaximumSize

     * @see LayoutManager

     */

    public Dimension maximumLayoutSize(Container target);

    /**

     * Returns the alignment along the x axis.  This specifies how

     * the component would like to be aligned relative to other

     * components.  The value should be a number between 0 and 1

     * where 0 represents alignment along the origin, 1 is aligned

     * the furthest away from the origin, 0.5 is centered, etc.

     */

    public float getLayoutAlignmentX(Container target);

    /**

     * Returns the alignment along the y axis.  This specifies how

     * the component would like to be aligned relative to other

     * components.  The value should be a number between 0 and 1

     * where 0 represents alignment along the origin, 1 is aligned

     * the furthest away from the origin, 0.5 is centered, etc.

     */

    public float getLayoutAlignmentY(Container target);

    /**

     * Invalidates the layout, indicating that if the layout manager

     * has cached information it should be discarded.

     */

    public void invalidateLayout(Container target);

}