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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 | } | ||