Java tutorial
/* * Copyright (c) 1996, 2014, Oracle and/or its affiliates. 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. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.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 * @param target the target container * @return the maximum size of the container */ 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. * * @param target the target container * @return the x-axis alignment preference */ 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. * * @param target the target container * @return the y-axis alignment preference */ public float getLayoutAlignmentY(Container target); /** * Invalidates the layout, indicating that if the layout manager * has cached information it should be discarded. * @param target the target container */ public void invalidateLayout(Container target); }