Java tutorial
/* * Copyright (c) 1997, 2015, 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 javax.swing; import java.awt.AWTEvent; import java.awt.BorderLayout; import java.awt.Component; import java.awt.Container; import java.awt.Frame; import java.awt.Graphics; import java.awt.GraphicsConfiguration; import java.awt.HeadlessException; import java.awt.Image; import java.awt.LayoutManager; import java.awt.event.WindowEvent; import java.beans.JavaBean; import java.beans.BeanProperty; import javax.accessibility.Accessible; import javax.accessibility.AccessibleContext; import javax.accessibility.AccessibleState; import javax.accessibility.AccessibleStateSet; /** * An extended version of <code>java.awt.Frame</code> that adds support for * the JFC/Swing component architecture. * You can find task-oriented documentation about using <code>JFrame</code> * in <em>The Java Tutorial</em>, in the section * <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/frame.html">How to Make Frames</a>. * * <p> * The <code>JFrame</code> class is slightly incompatible with <code>Frame</code>. * Like all other JFC/Swing top-level containers, * a <code>JFrame</code> contains a <code>JRootPane</code> as its only child. * The <b>content pane</b> provided by the root pane should, * as a rule, contain * all the non-menu components displayed by the <code>JFrame</code>. * This is different from the AWT <code>Frame</code> case. * As a convenience, the {@code add}, {@code remove}, and {@code setLayout} * methods of this class are overridden, so that they delegate calls * to the corresponding methods of the {@code ContentPane}. * For example, you can add a child component to a frame as follows: * <pre> * frame.add(child); * </pre> * And the child will be added to the contentPane. * The content pane will * always be non-null. Attempting to set it to null will cause the JFrame * to throw an exception. The default content pane will have a BorderLayout * manager set on it. * Refer to {@link javax.swing.RootPaneContainer} * for details on adding, removing and setting the <code>LayoutManager</code> * of a <code>JFrame</code>. * <p> * Unlike a <code>Frame</code>, a <code>JFrame</code> has some notion of how to * respond when the user attempts to close the window. The default behavior * is to simply hide the JFrame when the user closes the window. To change the * default behavior, you invoke the method * {@link #setDefaultCloseOperation}. * To make the <code>JFrame</code> behave the same as a <code>Frame</code> * instance, use * <code>setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE)</code>. * <p> * For more information on content panes * and other features that root panes provide, * see <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/toplevel.html">Using Top-Level Containers</a> in <em>The Java Tutorial</em>. * <p> * In a multi-screen environment, you can create a <code>JFrame</code> * on a different screen device. See {@link java.awt.Frame} for more * information. * <p> * <strong>Warning:</strong> Swing is not thread safe. For more * information see <a * href="package-summary.html#threading">Swing's Threading * Policy</a>. * <p> * <strong>Warning:</strong> * Serialized objects of this class will not be compatible with * future Swing releases. The current serialization support is * appropriate for short term storage or RMI between applications running * the same version of Swing. As of 1.4, support for long term storage * of all JavaBeans™ * has been added to the <code>java.beans</code> package. * Please see {@link java.beans.XMLEncoder}. * * @see JRootPane * @see #setDefaultCloseOperation * @see java.awt.event.WindowListener#windowClosing * @see javax.swing.RootPaneContainer * * @author Jeff Dinkins * @author Georges Saab * @author David Kloba * @since 1.2 */ @JavaBean(defaultProperty = "JMenuBar", description = "A toplevel window which can be minimized to an icon.") @SwingContainer(delegate = "getContentPane") @SuppressWarnings("serial") // Same-version serialization only public class JFrame extends Frame implements WindowConstants, Accessible, RootPaneContainer, TransferHandler.HasGetTransferHandler { /** * Key into the AppContext, used to check if should provide decorations * by default. */ private static final Object defaultLookAndFeelDecoratedKey = new StringBuffer( "JFrame.defaultLookAndFeelDecorated"); private int defaultCloseOperation = HIDE_ON_CLOSE; /** * The <code>TransferHandler</code> for this frame. */ private TransferHandler transferHandler; /** * The <code>JRootPane</code> instance that manages the * <code>contentPane</code> * and optional <code>menuBar</code> for this frame, as well as the * <code>glassPane</code>. * * @see JRootPane * @see RootPaneContainer */ protected JRootPane rootPane; /** * If true then calls to <code>add</code> and <code>setLayout</code> * will be forwarded to the <code>contentPane</code>. This is initially * false, but is set to true when the <code>JFrame</code> is constructed. * * @see #isRootPaneCheckingEnabled * @see #setRootPaneCheckingEnabled * @see javax.swing.RootPaneContainer */ protected boolean rootPaneCheckingEnabled = false; /** * Constructs a new frame that is initially invisible. * <p> * This constructor sets the component's locale property to the value * returned by <code>JComponent.getDefaultLocale</code>. * * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true. * @see java.awt.GraphicsEnvironment#isHeadless * @see Component#setSize * @see Component#setVisible * @see JComponent#getDefaultLocale */ public JFrame() throws HeadlessException { super(); frameInit(); } /** * Creates a <code>Frame</code> in the specified * <code>GraphicsConfiguration</code> of * a screen device and a blank title. * <p> * This constructor sets the component's locale property to the value * returned by <code>JComponent.getDefaultLocale</code>. * * @param gc the <code>GraphicsConfiguration</code> that is used * to construct the new <code>Frame</code>; * if <code>gc</code> is <code>null</code>, the system * default <code>GraphicsConfiguration</code> is assumed * @exception IllegalArgumentException if <code>gc</code> is not from * a screen device. This exception is always thrown when * GraphicsEnvironment.isHeadless() returns true. * @see java.awt.GraphicsEnvironment#isHeadless * @see JComponent#getDefaultLocale * @since 1.3 */ public JFrame(GraphicsConfiguration gc) { super(gc); frameInit(); } /** * Creates a new, initially invisible <code>Frame</code> with the * specified title. * <p> * This constructor sets the component's locale property to the value * returned by <code>JComponent.getDefaultLocale</code>. * * @param title the title for the frame * @exception HeadlessException if GraphicsEnvironment.isHeadless() * returns true. * @see java.awt.GraphicsEnvironment#isHeadless * @see Component#setSize * @see Component#setVisible * @see JComponent#getDefaultLocale */ public JFrame(String title) throws HeadlessException { super(title); frameInit(); } /** * Creates a <code>JFrame</code> with the specified title and the * specified <code>GraphicsConfiguration</code> of a screen device. * <p> * This constructor sets the component's locale property to the value * returned by <code>JComponent.getDefaultLocale</code>. * * @param title the title to be displayed in the * frame's border. A <code>null</code> value is treated as * an empty string, "". * @param gc the <code>GraphicsConfiguration</code> that is used * to construct the new <code>JFrame</code> with; * if <code>gc</code> is <code>null</code>, the system * default <code>GraphicsConfiguration</code> is assumed * @exception IllegalArgumentException if <code>gc</code> is not from * a screen device. This exception is always thrown when * GraphicsEnvironment.isHeadless() returns true. * @see java.awt.GraphicsEnvironment#isHeadless * @see JComponent#getDefaultLocale * @since 1.3 */ public JFrame(String title, GraphicsConfiguration gc) { super(title, gc); frameInit(); } /** Called by the constructors to init the <code>JFrame</code> properly. */ protected void frameInit() { enableEvents(AWTEvent.KEY_EVENT_MASK | AWTEvent.WINDOW_EVENT_MASK); setLocale(JComponent.getDefaultLocale()); setRootPane(createRootPane()); setBackground(UIManager.getColor("control")); setRootPaneCheckingEnabled(true); if (JFrame.isDefaultLookAndFeelDecorated()) { boolean supportsWindowDecorations = UIManager.getLookAndFeel().getSupportsWindowDecorations(); if (supportsWindowDecorations) { setUndecorated(true); getRootPane().setWindowDecorationStyle(JRootPane.FRAME); } } sun.awt.SunToolkit.checkAndSetPolicy(this); } /** * Called by the constructor methods to create the default * <code>rootPane</code>. * * @return a new {@code JRootPane} */ protected JRootPane createRootPane() { JRootPane rp = new JRootPane(); // NOTE: this uses setOpaque vs LookAndFeel.installProperty as there // is NO reason for the RootPane not to be opaque. For painting to // work the contentPane must be opaque, therefor the RootPane can // also be opaque. rp.setOpaque(true); return rp; } /** * Processes window events occurring on this component. * Hides the window or disposes of it, as specified by the setting * of the <code>defaultCloseOperation</code> property. * * @param e the window event * @see #setDefaultCloseOperation * @see java.awt.Window#processWindowEvent */ protected void processWindowEvent(final WindowEvent e) { super.processWindowEvent(e); if (e.getID() == WindowEvent.WINDOW_CLOSING) { switch (defaultCloseOperation) { case HIDE_ON_CLOSE: setVisible(false); break; case DISPOSE_ON_CLOSE: dispose(); break; case EXIT_ON_CLOSE: // This needs to match the checkExit call in // setDefaultCloseOperation System.exit(0); break; case DO_NOTHING_ON_CLOSE: default: } } } /** * Sets the operation that will happen by default when * the user initiates a "close" on this frame. * You must specify one of the following choices: * <br><br> * <ul> * <li><code>DO_NOTHING_ON_CLOSE</code> * (defined in <code>WindowConstants</code>): * Don't do anything; require the * program to handle the operation in the <code>windowClosing</code> * method of a registered <code>WindowListener</code> object. * * <li><code>HIDE_ON_CLOSE</code> * (defined in <code>WindowConstants</code>): * Automatically hide the frame after * invoking any registered <code>WindowListener</code> * objects. * * <li><code>DISPOSE_ON_CLOSE</code> * (defined in <code>WindowConstants</code>): * Automatically hide and dispose the * frame after invoking any registered <code>WindowListener</code> * objects. * * <li><code>EXIT_ON_CLOSE</code> * (defined in <code>WindowConstants</code>): * Exit the application using the <code>System</code> * <code>exit</code> method. Use this only in applications. * </ul> * <p> * The value is set to <code>HIDE_ON_CLOSE</code> by default. Changes * to the value of this property cause the firing of a property * change event, with property name "defaultCloseOperation". * <p> * <b>Note</b>: When the last displayable window within the * Java virtual machine (VM) is disposed of, the VM may * terminate. See <a href="../../java/awt/doc-files/AWTThreadIssues.html"> * AWT Threading Issues</a> for more information. * * @param operation the operation which should be performed when the * user closes the frame * @exception IllegalArgumentException if defaultCloseOperation value * isn't one of the above valid values * @see #addWindowListener * @see #getDefaultCloseOperation * @see WindowConstants * @throws SecurityException * if <code>EXIT_ON_CLOSE</code> has been specified and the * <code>SecurityManager</code> will * not allow the caller to invoke <code>System.exit</code> * @see java.lang.Runtime#exit(int) */ @BeanProperty(preferred = true, enumerationValues = { "WindowConstants.DO_NOTHING_ON_CLOSE", "WindowConstants.HIDE_ON_CLOSE", "WindowConstants.DISPOSE_ON_CLOSE", "WindowConstants.EXIT_ON_CLOSE" }, description = "The frame's default close operation.") public void setDefaultCloseOperation(int operation) { if (operation != DO_NOTHING_ON_CLOSE && operation != HIDE_ON_CLOSE && operation != DISPOSE_ON_CLOSE && operation != EXIT_ON_CLOSE) { throw new IllegalArgumentException("defaultCloseOperation must be" + " one of: DO_NOTHING_ON_CLOSE, HIDE_ON_CLOSE," + " DISPOSE_ON_CLOSE, or EXIT_ON_CLOSE"); } if (operation == EXIT_ON_CLOSE) { SecurityManager security = System.getSecurityManager(); if (security != null) { security.checkExit(0); } } if (this.defaultCloseOperation != operation) { int oldValue = this.defaultCloseOperation; this.defaultCloseOperation = operation; firePropertyChange("defaultCloseOperation", oldValue, operation); } } /** * Returns the operation that occurs when the user * initiates a "close" on this frame. * * @return an integer indicating the window-close operation * @see #setDefaultCloseOperation */ public int getDefaultCloseOperation() { return defaultCloseOperation; } /** * Sets the {@code transferHandler} property, which is a mechanism to * support transfer of data into this component. Use {@code null} * if the component does not support data transfer operations. * <p> * If the system property {@code suppressSwingDropSupport} is {@code false} * (the default) and the current drop target on this component is either * {@code null} or not a user-set drop target, this method will change the * drop target as follows: If {@code newHandler} is {@code null} it will * clear the drop target. If not {@code null} it will install a new * {@code DropTarget}. * <p> * Note: When used with {@code JFrame}, {@code TransferHandler} only * provides data import capability, as the data export related methods * are currently typed to {@code JComponent}. * <p> * Please see * <a href="https://docs.oracle.com/javase/tutorial/uiswing/dnd/index.html"> * How to Use Drag and Drop and Data Transfer</a>, a section in * <em>The Java Tutorial</em>, for more information. * * @param newHandler the new {@code TransferHandler} * * @see TransferHandler * @see #getTransferHandler * @see java.awt.Component#setDropTarget * @since 1.6 */ @BeanProperty(hidden = true, description = "Mechanism for transfer of data into the component") public void setTransferHandler(TransferHandler newHandler) { TransferHandler oldHandler = transferHandler; transferHandler = newHandler; SwingUtilities.installSwingDropTargetAsNecessary(this, transferHandler); firePropertyChange("transferHandler", oldHandler, newHandler); } /** * Gets the <code>transferHandler</code> property. * * @return the value of the <code>transferHandler</code> property * * @see TransferHandler * @see #setTransferHandler * @since 1.6 */ public TransferHandler getTransferHandler() { return transferHandler; } /** * Just calls <code>paint(g)</code>. This method was overridden to * prevent an unnecessary call to clear the background. * * @param g the Graphics context in which to paint */ public void update(Graphics g) { paint(g); } /** * Sets the menubar for this frame. * @param menubar the menubar being placed in the frame * * @see #getJMenuBar */ @BeanProperty(bound = false, hidden = true, description = "The menubar for accessing pulldown menus from this frame.") public void setJMenuBar(final JMenuBar menubar) { getRootPane().setJMenuBar(menubar); } /** * Returns the menubar set on this frame. * @return the menubar for this frame * * @see #setJMenuBar */ public JMenuBar getJMenuBar() { return getRootPane().getJMenuBar(); } /** * Returns whether calls to <code>add</code> and * <code>setLayout</code> are forwarded to the <code>contentPane</code>. * * @return true if <code>add</code> and <code>setLayout</code> * are forwarded; false otherwise * * @see #addImpl * @see #setLayout * @see #setRootPaneCheckingEnabled * @see javax.swing.RootPaneContainer */ protected boolean isRootPaneCheckingEnabled() { return rootPaneCheckingEnabled; } /** * Sets whether calls to <code>add</code> and * <code>setLayout</code> are forwarded to the <code>contentPane</code>. * * @param enabled true if <code>add</code> and <code>setLayout</code> * are forwarded, false if they should operate directly on the * <code>JFrame</code>. * * @see #addImpl * @see #setLayout * @see #isRootPaneCheckingEnabled * @see javax.swing.RootPaneContainer */ @BeanProperty(hidden = true, description = "Whether the add and setLayout methods are forwarded") protected void setRootPaneCheckingEnabled(boolean enabled) { rootPaneCheckingEnabled = enabled; } /** * Adds the specified child <code>Component</code>. * This method is overridden to conditionally forward calls to the * <code>contentPane</code>. * By default, children are added to the <code>contentPane</code> instead * of the frame, refer to {@link javax.swing.RootPaneContainer} for * details. * * @param comp the component to be enhanced * @param constraints the constraints to be respected * @param index the index * @exception IllegalArgumentException if <code>index</code> is invalid * @exception IllegalArgumentException if adding the container's parent * to itself * @exception IllegalArgumentException if adding a window to a container * * @see #setRootPaneCheckingEnabled * @see javax.swing.RootPaneContainer */ protected void addImpl(Component comp, Object constraints, int index) { if (isRootPaneCheckingEnabled()) { getContentPane().add(comp, constraints, index); } else { super.addImpl(comp, constraints, index); } } /** * Removes the specified component from the container. If * <code>comp</code> is not the <code>rootPane</code>, this will forward * the call to the <code>contentPane</code>. This will do nothing if * <code>comp</code> is not a child of the <code>JFrame</code> or * <code>contentPane</code>. * * @param comp the component to be removed * @throws NullPointerException if <code>comp</code> is null * @see #add * @see javax.swing.RootPaneContainer */ public void remove(Component comp) { if (comp == rootPane) { super.remove(comp); } else { getContentPane().remove(comp); } } /** * Sets the <code>LayoutManager</code>. * Overridden to conditionally forward the call to the * <code>contentPane</code>. * Refer to {@link javax.swing.RootPaneContainer} for * more information. * * @param manager the <code>LayoutManager</code> * @see #setRootPaneCheckingEnabled * @see javax.swing.RootPaneContainer */ public void setLayout(LayoutManager manager) { if (isRootPaneCheckingEnabled()) { getContentPane().setLayout(manager); } else { super.setLayout(manager); } } /** * Returns the <code>rootPane</code> object for this frame. * @return the <code>rootPane</code> property * * @see #setRootPane * @see RootPaneContainer#getRootPane */ @BeanProperty(bound = false, hidden = true, description = "the RootPane object for this frame.") public JRootPane getRootPane() { return rootPane; } /** * Sets the <code>rootPane</code> property. * This method is called by the constructor. * @param root the <code>rootPane</code> object for this frame * * @see #getRootPane */ protected void setRootPane(JRootPane root) { if (rootPane != null) { remove(rootPane); } rootPane = root; if (rootPane != null) { boolean checkingEnabled = isRootPaneCheckingEnabled(); try { setRootPaneCheckingEnabled(false); add(rootPane, BorderLayout.CENTER); } finally { setRootPaneCheckingEnabled(checkingEnabled); } } } /** * {@inheritDoc} */ public void setIconImage(Image image) { super.setIconImage(image); } /** * Returns the <code>contentPane</code> object for this frame. * @return the <code>contentPane</code> property * * @see #setContentPane * @see RootPaneContainer#getContentPane */ public Container getContentPane() { return getRootPane().getContentPane(); } /** * Sets the <code>contentPane</code> property. * This method is called by the constructor. * <p> * Swing's painting architecture requires an opaque <code>JComponent</code> * in the containment hierarchy. This is typically provided by the * content pane. If you replace the content pane it is recommended you * replace it with an opaque <code>JComponent</code>. * * @param contentPane the <code>contentPane</code> object for this frame * * @exception java.awt.IllegalComponentStateException (a runtime * exception) if the content pane parameter is <code>null</code> * @see #getContentPane * @see RootPaneContainer#setContentPane * @see JRootPane */ @BeanProperty(bound = false, hidden = true, description = "The client area of the frame where child components are normally inserted.") public void setContentPane(Container contentPane) { getRootPane().setContentPane(contentPane); } /** * Returns the <code>layeredPane</code> object for this frame. * @return the <code>layeredPane</code> property * * @see #setLayeredPane * @see RootPaneContainer#getLayeredPane */ public JLayeredPane getLayeredPane() { return getRootPane().getLayeredPane(); } /** * Sets the <code>layeredPane</code> property. * This method is called by the constructor. * @param layeredPane the <code>layeredPane</code> object for this frame * * @exception java.awt.IllegalComponentStateException (a runtime * exception) if the layered pane parameter is <code>null</code> * @see #getLayeredPane * @see RootPaneContainer#setLayeredPane */ @BeanProperty(bound = false, hidden = true, description = "The pane that holds the various frame layers.") public void setLayeredPane(JLayeredPane layeredPane) { getRootPane().setLayeredPane(layeredPane); } /** * Returns the <code>glassPane</code> object for this frame. * @return the <code>glassPane</code> property * * @see #setGlassPane * @see RootPaneContainer#getGlassPane */ public Component getGlassPane() { return getRootPane().getGlassPane(); } /** * Sets the <code>glassPane</code> property. * This method is called by the constructor. * @param glassPane the <code>glassPane</code> object for this frame * * @see #getGlassPane * @see RootPaneContainer#setGlassPane */ @BeanProperty(bound = false, hidden = true, description = "A transparent pane used for menu rendering.") public void setGlassPane(Component glassPane) { getRootPane().setGlassPane(glassPane); } /** * {@inheritDoc} * * @since 1.6 */ @BeanProperty(bound = false) public Graphics getGraphics() { JComponent.getGraphicsInvoked(this); return super.getGraphics(); } /** * Repaints the specified rectangle of this component within * <code>time</code> milliseconds. Refer to <code>RepaintManager</code> * for details on how the repaint is handled. * * @param time maximum time in milliseconds before update * @param x the <i>x</i> coordinate * @param y the <i>y</i> coordinate * @param width the width * @param height the height * @see RepaintManager * @since 1.6 */ public void repaint(long time, int x, int y, int width, int height) { if (RepaintManager.HANDLE_TOP_LEVEL_PAINT) { RepaintManager.currentManager(this).addDirtyRegion(this, x, y, width, height); } else { super.repaint(time, x, y, width, height); } } /** * Provides a hint as to whether or not newly created <code>JFrame</code>s * should have their Window decorations (such as borders, widgets to * close the window, title...) provided by the current look * and feel. If <code>defaultLookAndFeelDecorated</code> is true, * the current <code>LookAndFeel</code> supports providing window * decorations, and the current window manager supports undecorated * windows, then newly created <code>JFrame</code>s will have their * Window decorations provided by the current <code>LookAndFeel</code>. * Otherwise, newly created <code>JFrame</code>s will have their * Window decorations provided by the current window manager. * <p> * You can get the same effect on a single JFrame by doing the following: * <pre> * JFrame frame = new JFrame(); * frame.setUndecorated(true); * frame.getRootPane().setWindowDecorationStyle(JRootPane.FRAME); * </pre> * * @param defaultLookAndFeelDecorated A hint as to whether or not current * look and feel should provide window decorations * @see javax.swing.LookAndFeel#getSupportsWindowDecorations * @since 1.4 */ public static void setDefaultLookAndFeelDecorated(boolean defaultLookAndFeelDecorated) { if (defaultLookAndFeelDecorated) { SwingUtilities.appContextPut(defaultLookAndFeelDecoratedKey, Boolean.TRUE); } else { SwingUtilities.appContextPut(defaultLookAndFeelDecoratedKey, Boolean.FALSE); } } /** * Returns true if newly created <code>JFrame</code>s should have their * Window decorations provided by the current look and feel. This is only * a hint, as certain look and feels may not support this feature. * * @return true if look and feel should provide Window decorations. * @since 1.4 */ public static boolean isDefaultLookAndFeelDecorated() { Boolean defaultLookAndFeelDecorated = (Boolean) SwingUtilities .appContextGet(defaultLookAndFeelDecoratedKey); if (defaultLookAndFeelDecorated == null) { defaultLookAndFeelDecorated = Boolean.FALSE; } return defaultLookAndFeelDecorated.booleanValue(); } /** * Returns a string representation of this <code>JFrame</code>. * This method * is intended to be used only for debugging purposes, and the * content and format of the returned string may vary between * implementations. The returned string may be empty but may not * be <code>null</code>. * * @return a string representation of this <code>JFrame</code> */ protected String paramString() { String defaultCloseOperationString; if (defaultCloseOperation == HIDE_ON_CLOSE) { defaultCloseOperationString = "HIDE_ON_CLOSE"; } else if (defaultCloseOperation == DISPOSE_ON_CLOSE) { defaultCloseOperationString = "DISPOSE_ON_CLOSE"; } else if (defaultCloseOperation == DO_NOTHING_ON_CLOSE) { defaultCloseOperationString = "DO_NOTHING_ON_CLOSE"; } else if (defaultCloseOperation == EXIT_ON_CLOSE) { defaultCloseOperationString = "EXIT_ON_CLOSE"; } else defaultCloseOperationString = ""; String rootPaneString = (rootPane != null ? rootPane.toString() : ""); String rootPaneCheckingEnabledString = (rootPaneCheckingEnabled ? "true" : "false"); return super.paramString() + ",defaultCloseOperation=" + defaultCloseOperationString + ",rootPane=" + rootPaneString + ",rootPaneCheckingEnabled=" + rootPaneCheckingEnabledString; } ///////////////// // Accessibility support //////////////// /** * The accessible context property. */ protected AccessibleContext accessibleContext = null; /** * Gets the AccessibleContext associated with this JFrame. * For JFrames, the AccessibleContext takes the form of an * AccessibleJFrame. * A new AccessibleJFrame instance is created if necessary. * * @return an AccessibleJFrame that serves as the * AccessibleContext of this JFrame */ public AccessibleContext getAccessibleContext() { if (accessibleContext == null) { accessibleContext = new AccessibleJFrame(); } return accessibleContext; } /** * This class implements accessibility support for the * <code>JFrame</code> class. It provides an implementation of the * Java Accessibility API appropriate to frame user-interface * elements. */ protected class AccessibleJFrame extends AccessibleAWTFrame { // AccessibleContext methods /** * Get the accessible name of this object. * * @return the localized name of the object -- can be null if this * object does not have a name */ public String getAccessibleName() { if (accessibleName != null) { return accessibleName; } else { if (getTitle() == null) { return super.getAccessibleName(); } else { return getTitle(); } } } /** * Get the state of this object. * * @return an instance of AccessibleStateSet containing the current * state set of the object * @see AccessibleState */ public AccessibleStateSet getAccessibleStateSet() { AccessibleStateSet states = super.getAccessibleStateSet(); if (isResizable()) { states.add(AccessibleState.RESIZABLE); } if (getFocusOwner() != null) { states.add(AccessibleState.ACTIVE); } // FIXME: [[[WDW - should also return ICONIFIED and ICONIFIABLE // if we can ever figure these out]]] return states; } } // inner class AccessibleJFrame }