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| 1 | /* | ||
| 2 | * Copyright (c) 1995, 2007, 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 | import javax.accessibility.*; | ||
| 28 | |||
| 29 | /** | ||
| 30 | * <code>Panel</code> is the simplest container class. A panel | ||
| 31 | * provides space in which an application can attach any other | ||
| 32 | * component, including other panels. | ||
| 33 | * <p> | ||
| 34 | * The default layout manager for a panel is the | ||
| 35 | * <code>FlowLayout</code> layout manager. | ||
| 36 | * | ||
| 37 | * @author Sami Shaio | ||
| 38 | * @see java.awt.FlowLayout | ||
| 39 | * @since JDK1.0 | ||
| 40 | */ | ||
| 41 | public class Panel extends Container implements Accessible { | ||
| 42 | private static final String base = "panel"; | ||
| 43 | private static int nameCounter = 0; | ||
| 44 | |||
| 45 | /* | ||
| 46 | * JDK 1.1 serialVersionUID | ||
| 47 | */ | ||
| 48 | private static final long serialVersionUID = -2728009084054400034L; | ||
| 49 | |||
| 50 | /** | ||
| 51 | * Creates a new panel using the default layout manager. | ||
| 52 | * The default layout manager for all panels is the | ||
| 53 | * <code>FlowLayout</code> class. | ||
| 54 | */ | ||
| 55 | public Panel() { | ||
| 56 | this(new FlowLayout()); | ||
| 57 | } | ||
| 58 | |||
| 59 | /** | ||
| 60 | * Creates a new panel with the specified layout manager. | ||
| 61 | * @param layout the layout manager for this panel. | ||
| 62 | * @since JDK1.1 | ||
| 63 | */ | ||
| 64 | public Panel(LayoutManager layout) { | ||
| 65 | setLayout(layout); | ||
| 66 | } | ||
| 67 | |||
| 68 | /** | ||
| 69 | * Construct a name for this component. Called by getName() when the | ||
| 70 | * name is null. | ||
| 71 | */ | ||
| 72 | String constructComponentName() { | ||
| 73 | synchronized (Panel.class) { | ||
| 74 | return base + nameCounter++; | ||
| 75 | } | ||
| 76 | } | ||
| 77 | |||
| 78 | /** | ||
| 79 | * Creates the Panel's peer. The peer allows you to modify the | ||
| 80 | * appearance of the panel without changing its functionality. | ||
| 81 | */ | ||
| 82 | |||
| 83 | public void addNotify() { | ||
| 84 | synchronized (getTreeLock()) { | ||
| 85 | if (peer == null) | ||
| 86 | peer = getToolkit().createPanel(this); | ||
| 87 | super.addNotify(); | ||
| 88 | } | ||
| 89 | } | ||
| 90 | |||
| 91 | ///////////////// | ||
| 92 | // Accessibility support | ||
| 93 | //////////////// | ||
| 94 | |||
| 95 | /** | ||
| 96 | * Gets the AccessibleContext associated with this Panel. | ||
| 97 | * For panels, the AccessibleContext takes the form of an | ||
| 98 | * AccessibleAWTPanel. | ||
| 99 | * A new AccessibleAWTPanel instance is created if necessary. | ||
| 100 | * | ||
| 101 | * @return an AccessibleAWTPanel that serves as the | ||
| 102 | * AccessibleContext of this Panel | ||
| 103 | * @since 1.3 | ||
| 104 | */ | ||
| 105 | public AccessibleContext getAccessibleContext() { | ||
| 106 | if (accessibleContext == null) { | ||
| 107 | accessibleContext = new AccessibleAWTPanel(); | ||
| 108 | } | ||
| 109 | return accessibleContext; | ||
| 110 | } | ||
| 111 | |||
| 112 | /** | ||
| 113 | * This class implements accessibility support for the | ||
| 114 | * <code>Panel</code> class. It provides an implementation of the | ||
| 115 | * Java Accessibility API appropriate to panel user-interface elements. | ||
| 116 | * @since 1.3 | ||
| 117 | */ | ||
| 118 | protected class AccessibleAWTPanel extends AccessibleAWTContainer { | ||
| 119 | |||
| 120 | private static final long serialVersionUID = -6409552226660031050L; | ||
| 121 | |||
| 122 | /** | ||
| 123 | * Get the role of this object. | ||
| 124 | * | ||
| 125 | * @return an instance of AccessibleRole describing the role of the | ||
| 126 | * object | ||
| 127 | */ | ||
| 128 | public AccessibleRole getAccessibleRole() { | ||
| 129 | return AccessibleRole.PANEL; | ||
| 130 | } | ||
| 131 | } | ||
| 132 | |||
| 133 | } | ||