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| 1 | +/* | |
| 2 | + * Copyright (c) 1996, 2001, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | +package java.awt; | |
| 26 | + | |
| 27 | +/** | |
| 28 | + * Defines an interface for classes that know how to layout Containers | |
| 29 | + * based on a layout constraints object. | |
| 30 | + * | |
| 31 | + * This interface extends the LayoutManager interface to deal with layouts | |
| 32 | + * explicitly in terms of constraint objects that specify how and where | |
| 33 | + * components should be added to the layout. | |
| 34 | + * <p> | |
| 35 | + * This minimal extension to LayoutManager is intended for tool | |
| 36 | + * providers who wish to the creation of constraint-based layouts. | |
| 37 | + * It does not yet provide full, general support for custom | |
| 38 | + * constraint-based layout managers. | |
| 39 | + * | |
| 40 | + * @see LayoutManager | |
| 41 | + * @see Container | |
| 42 | + * | |
| 43 | + * @author Jonni Kanerva | |
| 44 | + */ | |
| 45 | +public interface LayoutManager2 extends LayoutManager { | |
| 46 | + | |
| 47 | + /** | |
| 48 | + * Adds the specified component to the layout, using the specified | |
| 49 | + * constraint object. | |
| 50 | + * @param comp the component to be added | |
| 51 | + * @param constraints where/how the component is added to the layout. | |
| 52 | + */ | |
| 53 | + void addLayoutComponent(Component comp, Object constraints); | |
| 54 | + | |
| 55 | + /** | |
| 56 | + * Calculates the maximum size dimensions for the specified container, | |
| 57 | + * given the components it contains. | |
| 58 | + * @see java.awt.Component#getMaximumSize | |
| 59 | + * @see LayoutManager | |
| 60 | + */ | |
| 61 | + public Dimension maximumLayoutSize(Container target); | |
| 62 | + | |
| 63 | + /** | |
| 64 | + * Returns the alignment along the x axis. This specifies how | |
| 65 | + * the component would like to be aligned relative to other | |
| 66 | + * components. The value should be a number between 0 and 1 | |
| 67 | + * where 0 represents alignment along the origin, 1 is aligned | |
| 68 | + * the furthest away from the origin, 0.5 is centered, etc. | |
| 69 | + */ | |
| 70 | + public float getLayoutAlignmentX(Container target); | |
| 71 | + | |
| 72 | + /** | |
| 73 | + * Returns the alignment along the y axis. This specifies how | |
| 74 | + * the component would like to be aligned relative to other | |
| 75 | + * components. The value should be a number between 0 and 1 | |
| 76 | + * where 0 represents alignment along the origin, 1 is aligned | |
| 77 | + * the furthest away from the origin, 0.5 is centered, etc. | |
| 78 | + */ | |
| 79 | + public float getLayoutAlignmentY(Container target); | |
| 80 | + | |
| 81 | + /** | |
| 82 | + * Invalidates the layout, indicating that if the layout manager | |
| 83 | + * has cached information it should be discarded. | |
| 84 | + */ | |
| 85 | + public void invalidateLayout(Container target); | |
| 86 | + | |
| 87 | +} | |