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134 lines
4.1 KiB
Java
134 lines
4.1 KiB
Java
/*
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* Copyright (c) 1995, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.awt;
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import javax.accessibility.*;
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/**
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* {@code Panel} is the simplest container class. A panel
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* provides space in which an application can attach any other
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* component, including other panels.
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* <p>
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* The default layout manager for a panel is the
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* {@code FlowLayout} layout manager.
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*
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* @author Sami Shaio
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* @see java.awt.FlowLayout
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* @since 1.0
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*/
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public class Panel extends Container implements Accessible {
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private static final String base = "panel";
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private static int nameCounter = 0;
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/*
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* JDK 1.1 serialVersionUID
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*/
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private static final long serialVersionUID = -2728009084054400034L;
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/**
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* Creates a new panel using the default layout manager.
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* The default layout manager for all panels is the
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* {@code FlowLayout} class.
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*/
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public Panel() {
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this(new FlowLayout());
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}
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/**
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* Creates a new panel with the specified layout manager.
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* @param layout the layout manager for this panel.
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* @since 1.1
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*/
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public Panel(LayoutManager layout) {
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setLayout(layout);
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}
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/**
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* Construct a name for this component. Called by getName() when the
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* name is null.
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*/
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String constructComponentName() {
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synchronized (Panel.class) {
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return base + nameCounter++;
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}
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}
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/**
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* Creates the Panel's peer. The peer allows you to modify the
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* appearance of the panel without changing its functionality.
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*/
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public void addNotify() {
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synchronized (getTreeLock()) {
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if (peer == null)
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peer = getComponentFactory().createPanel(this);
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super.addNotify();
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}
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}
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/////////////////
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// Accessibility support
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////////////////
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/**
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* Gets the AccessibleContext associated with this Panel.
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* For panels, the AccessibleContext takes the form of an
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* AccessibleAWTPanel.
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* A new AccessibleAWTPanel instance is created if necessary.
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*
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* @return an AccessibleAWTPanel that serves as the
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* AccessibleContext of this Panel
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* @since 1.3
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*/
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public AccessibleContext getAccessibleContext() {
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if (accessibleContext == null) {
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accessibleContext = new AccessibleAWTPanel();
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}
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return accessibleContext;
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}
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/**
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* This class implements accessibility support for the
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* {@code Panel} class. It provides an implementation of the
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* Java Accessibility API appropriate to panel user-interface elements.
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* @since 1.3
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*/
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protected class AccessibleAWTPanel extends AccessibleAWTContainer {
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private static final long serialVersionUID = -6409552226660031050L;
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/**
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* Get the role of this object.
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*
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* @return an instance of AccessibleRole describing the role of the
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* object
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*/
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public AccessibleRole getAccessibleRole() {
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return AccessibleRole.PANEL;
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}
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}
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}
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