| /* |
| * 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); |
| |
| } |