/*

 * 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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

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 */

package java.awt;

import java.awt.peer.DialogPeer;

import java.awt.event.*;

import java.io.ObjectInputStream;

import java.io.IOException;

import java.util.Iterator;

import java.util.concurrent.atomic.AtomicLong;

import java.security.AccessController;

import java.security.PrivilegedAction;

import javax.accessibility.*;

import sun.awt.AppContext;

import sun.awt.SunToolkit;

import sun.awt.PeerEvent;

import sun.awt.util.IdentityArrayList;

import sun.awt.util.IdentityLinkedList;

import sun.security.util.SecurityConstants;

/**

 * A Dialog is a top-level window with a title and a border

 * that is typically used to take some form of input from the user.

 *

 * The size of the dialog includes any area designated for the

 * border.  The dimensions of the border area can be obtained

 * using the <code>getInsets</code> method, however, since

 * these dimensions are platform-dependent, a valid insets

 * value cannot be obtained until the dialog is made displayable

 * by either calling <code>pack</code> or <code>show</code>.

 * Since the border area is included in the overall size of the

 * dialog, the border effectively obscures a portion of the dialog,

 * constraining the area available for rendering and/or displaying

 * subcomponents to the rectangle which has an upper-left corner

 * location of <code>(insets.left, insets.top)</code>, and has a size of

 * <code>width - (insets.left + insets.right)</code> by

 * <code>height - (insets.top + insets.bottom)</code>.

 * <p>

 * The default layout for a dialog is <code>BorderLayout</code>.

 * <p>

 * A dialog may have its native decorations (i.e. Frame & Titlebar) turned off

 * with <code>setUndecorated</code>.  This can only be done while the dialog

 * is not {@link Component#isDisplayable() displayable}.

 * <p>

 * A dialog may have another window as its owner when it's constructed.  When

 * the owner window of a visible dialog is minimized, the dialog will

 * automatically be hidden from the user. When the owner window is subsequently

 * restored, the dialog is made visible to the user again.

 * <p>

 * In a multi-screen environment, you can create a <code>Dialog</code>

 * on a different screen device than its owner.  See {@link java.awt.Frame} for

 * more information.

 * <p>

 * A dialog can be either modeless (the default) or modal.  A modal

 * dialog is one which blocks input to some other top-level windows

 * in the application, except for any windows created with the dialog

 * as their owner. See <a href="doc-files/Modality.html">AWT Modality</a>

 * specification for details.

 * <p>

 * Dialogs are capable of generating the following

 * <code>WindowEvents</code>:

 * <code>WindowOpened</code>, <code>WindowClosing</code>,

 * <code>WindowClosed</code>, <code>WindowActivated</code>,

 * <code>WindowDeactivated</code>, <code>WindowGainedFocus</code>,

 * <code>WindowLostFocus</code>.

 *

 * @see WindowEvent

 * @see Window#addWindowListener

 *

 * @author      Sami Shaio

 * @author      Arthur van Hoff

 * @since       JDK1.0

 */

public class Dialog extends Window {

    static {

        /* ensure that the necessary native libraries are loaded */

        Toolkit.loadLibraries();

        if (!GraphicsEnvironment.isHeadless()) {

            initIDs();

        }

    }

    /**

     * A dialog's resizable property. Will be true

     * if the Dialog is to be resizable, otherwise

     * it will be false.

     *

     * @serial

     * @see #setResizable(boolean)

     */

    boolean resizable = true;

    /**

     * This field indicates whether the dialog is undecorated.

     * This property can only be changed while the dialog is not displayable.

     * <code>undecorated</code> will be true if the dialog is

     * undecorated, otherwise it will be false.

     *

     * @serial

     * @see #setUndecorated(boolean)

     * @see #isUndecorated()

     * @see Component#isDisplayable()

     * @since 1.4

     */

    boolean undecorated = false;

    /**

     * Modal dialogs block all input to some top-level windows.

     * Whether a particular window is blocked depends on dialog's type

     * of modality; this is called the "scope of blocking". The

     * <code>ModalityType</code> enum specifies modal types and their

     * associated scopes.

     *

     * @see Dialog#getModalityType

     * @see Dialog#setModalityType

     * @see Toolkit#isModalityTypeSupported

     *

     * @since 1.6

     */

    public static enum ModalityType {

        /**

         * <code>MODELESS</code> dialog doesn't block any top-level windows.

         */

        MODELESS,

        /**

         * A <code>DOCUMENT_MODAL</code> dialog blocks input to all top-level windows

         * from the same document except those from its own child hierarchy.

         * A document is a top-level window without an owner. It may contain child

         * windows that, together with the top-level window are treated as a single

         * solid document. Since every top-level window must belong to some

         * document, its root can be found as the top-nearest window without an owner.

         */

        DOCUMENT_MODAL,

        /**

         * An <code>APPLICATION_MODAL</code> dialog blocks all top-level windows

         * from the same Java application except those from its own child hierarchy.

         * If there are several applets launched in a browser, they can be

         * treated either as separate applications or a single one. This behavior

         * is implementation-dependent.

         */

        APPLICATION_MODAL,

        /**

         * A <code>TOOLKIT_MODAL</code> dialog blocks all top-level windows run

         * from the same toolkit except those from its own child hierarchy. If there

         * are several applets launched in a browser, all of them run with the same

         * toolkit; thus, a toolkit-modal dialog displayed by an applet may affect

         * other applets and all windows of the browser instance which embeds the

         * Java runtime environment for this toolkit.

         * Special <code>AWTPermission</code> "toolkitModality" must be granted to use

         * toolkit-modal dialogs. If a <code>TOOLKIT_MODAL</code> dialog is being created

         * and this permission is not granted, a <code>SecurityException</code> will be

         * thrown, and no dialog will be created. If a modality type is being changed

         * to <code>TOOLKIT_MODAL</code> and this permission is not granted, a

         * <code>SecurityException</code> will be thrown, and the modality type will

         * be left unchanged.

         */

        TOOLKIT_MODAL

    };

    /**

     * Default modality type for modal dialogs. The default modality type is

     * <code>APPLICATION_MODAL</code>. Calling the oldstyle <code>setModal(true)</code>

     * is equal to <code>setModalityType(DEFAULT_MODALITY_TYPE)</code>.

     *

     * @see java.awt.Dialog.ModalityType

     * @see java.awt.Dialog#setModal

     *

     * @since 1.6

     */

    public final static ModalityType DEFAULT_MODALITY_TYPE = ModalityType.APPLICATION_MODAL;

    /**

     * True if this dialog is modal, false is the dialog is modeless.

     * A modal dialog blocks user input to some application top-level

     * windows. This field is kept only for backwards compatibility. Use the

     * {@link Dialog.ModalityType ModalityType} enum instead.

     *

     * @serial

     *

     * @see #isModal

     * @see #setModal

     * @see #getModalityType

     * @see #setModalityType

     * @see ModalityType

     * @see ModalityType#MODELESS

     * @see #DEFAULT_MODALITY_TYPE

     */

    boolean modal;

    /**

     * Modality type of this dialog. If the dialog's modality type is not

     * {@link Dialog.ModalityType#MODELESS ModalityType.MODELESS}, it blocks all

     * user input to some application top-level windows.

     *

     * @serial

     *

     * @see ModalityType

     * @see #getModalityType

     * @see #setModalityType

     *

     * @since 1.6

     */

    ModalityType modalityType;

    /**

     * Any top-level window can be marked not to be blocked by modal

     * dialogs. This is called "modal exclusion". This enum specifies

     * the possible modal exclusion types.

     *

     * @see Window#getModalExclusionType

     * @see Window#setModalExclusionType

     * @see Toolkit#isModalExclusionTypeSupported

     *

     * @since 1.6

     */

    public static enum ModalExclusionType {

        /**

         * No modal exclusion.

         */

        NO_EXCLUDE,

        /**

         * <code>APPLICATION_EXCLUDE</code> indicates that a top-level window

         * won't be blocked by any application-modal dialogs. Also, it isn't

         * blocked by document-modal dialogs from outside of its child hierarchy.

         */

        APPLICATION_EXCLUDE,

        /**

         * <code>TOOLKIT_EXCLUDE</code> indicates that a top-level window

         * won't be blocked by  application-modal or toolkit-modal dialogs. Also,

         * it isn't blocked by document-modal dialogs from outside of its

         * child hierarchy.

         * The "toolkitModality" <code>AWTPermission</code> must be granted

         * for this exclusion. If an exclusion property is being changed to

         * <code>TOOLKIT_EXCLUDE</code> and this permission is not granted, a

         * <code>SecurityEcxeption</code> will be thrown, and the exclusion

         * property will be left unchanged.

         */

        TOOLKIT_EXCLUDE

    };

    /**

     * @since 1.6

     */

    private final static ModalExclusionType DEFAULT_MODAL_EXCLUSION_TYPE =

        ModalExclusionType.APPLICATION_EXCLUDE;

    /* operations with this list should be synchronized on tree lock*/

    transient static IdentityArrayList<Dialog> modalDialogs = new IdentityArrayList<Dialog>();

    transient IdentityArrayList<Window> blockedWindows = new IdentityArrayList<Window>();

    /**

     * Specifies the title of the Dialog.

     * This field can be null.

     *

     * @serial

     * @see #getTitle()

     * @see #setTitle(String)

     */

    String title;

    private transient volatile boolean keepBlockingEDT = false;

    private transient volatile boolean keepBlockingCT = false;

    private transient ModalEventFilter modalFilter;

    /*

     * Indicates that this dialog is being hidden. This flag is set to true at

     * the beginning of hide() and to false at the end of hide().

     *

     * @see #hide()

     * @see #hideAndDisposePreHandler()

     * @see #hideAndDisposeHandler()

     * @see #shouldBlock()

     */

    transient volatile boolean isInHide = false;

    /*

     * Indicates that this dialog is being disposed. This flag is set to true at

     * the beginning of doDispose() and to false at the end of doDispose().

     *

     * @see #hide()

     * @see #hideAndDisposePreHandler()

     * @see #hideAndDisposeHandler()

     * @see #doDispose()

     */

    transient volatile boolean isInDispose = false;

    private static final String base = "dialog";

    private static int nameCounter = 0;

    /*

     * JDK 1.1 serialVersionUID

     */

    private static final long serialVersionUID = 5920926903803293709L;

    /**

     * Constructs an initially invisible, modeless <code>Dialog</code> with

     * the specified owner <code>Frame</code> and an empty title.

     *

     * @param owner the owner of the dialog or <code>null</code> if

     *     this dialog has no owner

     * @exception java.lang.IllegalArgumentException if the <code>owner</code>'s

     *    <code>GraphicsConfiguration</code> is not from a screen device

     * @exception HeadlessException when

     *    <code>GraphicsEnvironment.isHeadless()</code> returns <code>true</code>

     *

     * @see java.awt.GraphicsEnvironment#isHeadless

     * @see Component#setSize

     * @see Component#setVisible

     */

     public Dialog(Frame owner) {

         this(owner, "", false);

     }

    /**

     * Constructs an initially invisible <code>Dialog</code> with the specified

     * owner <code>Frame</code> and modality and an empty title.

     *

     * @param owner the owner of the dialog or <code>null</code> if

     *     this dialog has no owner

     * @param modal specifes whether dialog blocks user input to other top-level

     *     windows when shown. If <code>false</code>, the dialog is <code>MODELESS</code>;

     *     if <code>true</code>, the modality type property is set to

     *     <code>DEFAULT_MODALITY_TYPE</code>

     * @exception java.lang.IllegalArgumentException if the <code>owner</code>'s

     *    <code>GraphicsConfiguration</code> is not from a screen device

     * @exception HeadlessException when

     *     <code>GraphicsEnvironment.isHeadless()</code> returns <code>true</code>

     *

     * @see java.awt.Dialog.ModalityType

     * @see java.awt.Dialog.ModalityType#MODELESS

     * @see java.awt.Dialog#DEFAULT_MODALITY_TYPE

     * @see java.awt.Dialog#setModal

     * @see java.awt.Dialog#setModalityType

     * @see java.awt.GraphicsEnvironment#isHeadless

     */

     public Dialog(Frame owner, boolean modal) {

         this(owner, "", modal);

     }

    /**

     * Constructs an initially invisible, modeless <code>Dialog</code> with

     * the specified owner <code>Frame</code> and title.

     *

     * @param owner the owner of the dialog or <code>null</code> if

     *     this dialog has no owner

     * @param title the title of the dialog or <code>null</code> if this dialog

     *     has no title

     * @exception IllegalArgumentException if the <code>owner</code>'s

     *     <code>GraphicsConfiguration</code> is not from a screen device

     * @exception HeadlessException when

     *     <code>GraphicsEnvironment.isHeadless()</code> returns <code>true</code>

     *

     * @see java.awt.GraphicsEnvironment#isHeadless

     * @see Component#setSize

     * @see Component#setVisible

     */

     public Dialog(Frame owner, String title) {

         this(owner, title, false);

     }

    /**

     * Constructs an initially invisible <code>Dialog</code> with the

     * specified owner <code>Frame</code>, title and modality.

     *

     * @param owner the owner of the dialog or <code>null</code> if

     *     this dialog has no owner

     * @param title the title of the dialog or <code>null</code> if this dialog

     *     has no title

     * @param modal specifes whether dialog blocks user input to other top-level

     *     windows when shown. If <code>false</code>, the dialog is <code>MODELESS</code>;

     *     if <code>true</code>, the modality type property is set to

     *     <code>DEFAULT_MODALITY_TYPE</code>

     * @exception java.lang.IllegalArgumentException if the <code>owner</code>'s

     *    <code>GraphicsConfiguration</code> is not from a screen device

     * @exception HeadlessException when

     *    <code>GraphicsEnvironment.isHeadless()</code> returns <code>true</code>

     *

     * @see java.awt.Dialog.ModalityType

     * @see java.awt.Dialog.ModalityType#MODELESS

     * @see java.awt.Dialog#DEFAULT_MODALITY_TYPE

     * @see java.awt.Dialog#setModal

     * @see java.awt.Dialog#setModalityType

     * @see java.awt.GraphicsEnvironment#isHeadless

     * @see Component#setSize

     * @see Component#setVisible

     */

     public Dialog(Frame owner, String title, boolean modal) {

         this(owner, title, modal ? DEFAULT_MODALITY_TYPE : ModalityType.MODELESS);

     }

    /**

     * Constructs an initially invisible <code>Dialog</code> with the specified owner

     * <code>Frame</code>, title, modality, and <code>GraphicsConfiguration</code>.

     * @param owner the owner of the dialog or <code>null</code> if this dialog

     *     has no owner

     * @param title the title of the dialog or <code>null</code> if this dialog

     *     has no title

     * @param modal specifes whether dialog blocks user input to other top-level

     *     windows when shown. If <code>false</code>, the dialog is <code>MODELESS</code>;

     *     if <code>true</code>, the modality type property is set to

     *     <code>DEFAULT_MODALITY_TYPE</code>

     * @param gc the <code>GraphicsConfiguration</code> of the target screen device;

     *     if <code>null</code>, the default system <code>GraphicsConfiguration</code>

     *     is assumed

     * @exception java.lang.IllegalArgumentException if <code>gc</code>

     *     is not from a screen device

     * @exception HeadlessException when

     *     <code>GraphicsEnvironment.isHeadless()</code> returns <code>true</code>

     *

     * @see java.awt.Dialog.ModalityType

     * @see java.awt.Dialog.ModalityType#MODELESS

     * @see java.awt.Dialog#DEFAULT_MODALITY_TYPE

     * @see java.awt.Dialog#setModal

     * @see java.awt.Dialog#setModalityType

     * @see java.awt.GraphicsEnvironment#isHeadless

     * @see Component#setSize

     * @see Component#setVisible

     * @since 1.4

     */

     public Dialog(Frame owner, String title, boolean modal,

                   GraphicsConfiguration gc) {

         this(owner, title, modal ? DEFAULT_MODALITY_TYPE : ModalityType.MODELESS, gc);

     }

    /**

     * Constructs an initially invisible, modeless <code>Dialog</code> with

     * the specified owner <code>Dialog</code> and an empty title.

     *

     * @param owner the owner of the dialog or <code>null</code> if this

     *     dialog has no owner

     * @exception java.lang.IllegalArgumentException if the <code>owner</code>'s

     *     <code>GraphicsConfiguration</code> is not from a screen device

     * @exception HeadlessException when

     *     <code>GraphicsEnvironment.isHeadless()</code> returns <code>true</code>

     * @see java.awt.GraphicsEnvironment#isHeadless

     * @since 1.2

     */

     public Dialog(Dialog owner) {

         this(owner, "", false);

     }

    /**

     * Constructs an initially invisible, modeless <code>Dialog</code>

     * with the specified owner <code>Dialog</code> and title.

     *

     * @param owner the owner of the dialog or <code>null</code> if this

     *     has no owner

     * @param title the title of the dialog or <code>null</code> if this dialog

     *     has no title

     * @exception java.lang.IllegalArgumentException if the <code>owner</code>'s

     *     <code>GraphicsConfiguration</code> is not from a screen device

     * @exception HeadlessException when

     *     <code>GraphicsEnvironment.isHeadless()</code> returns <code>true</code>

     *

     * @see java.awt.GraphicsEnvironment#isHeadless

     * @since 1.2

     */

     public Dialog(Dialog owner, String title) {

         this(owner, title, false);

     }

    /**

     * Constructs an initially invisible <code>Dialog</code> with the

     * specified owner <code>Dialog</code>, title, and modality.

     *

     * @param owner the owner of the dialog or <code>null</code> if this

     *     dialog has no owner

     * @param title the title of the dialog or <code>null</code> if this

     *     dialog has no title

     * @param modal specifes whether dialog blocks user input to other top-level

     *     windows when shown. If <code>false</code>, the dialog is <code>MODELESS</code>;

     *     if <code>true</code>, the modality type property is set to

     *     <code>DEFAULT_MODALITY_TYPE</code>

     * @exception IllegalArgumentException if the <code>owner</code>'s

     *    <code>GraphicsConfiguration</code> is not from a screen device

     * @exception HeadlessException when

     *    <code>GraphicsEnvironment.isHeadless()</code> returns <code>true</code>

     *

     * @see java.awt.Dialog.ModalityType

     * @see java.awt.Dialog.ModalityType#MODELESS

     * @see java.awt.Dialog#DEFAULT_MODALITY_TYPE

     * @see java.awt.Dialog#setModal

     * @see java.awt.Dialog#setModalityType

     * @see java.awt.GraphicsEnvironment#isHeadless

     *

     * @since 1.2

     */

     public Dialog(Dialog owner, String title, boolean modal) {

         this(owner, title, modal ? DEFAULT_MODALITY_TYPE : ModalityType.MODELESS);

     }

    /**

     * Constructs an initially invisible <code>Dialog</code> with the

     * specified owner <code>Dialog</code>, title, modality and

     * <code>GraphicsConfiguration</code>.

     *

     * @param owner the owner of the dialog or <code>null</code> if this

     *     dialog has no owner

     * @param title the title of the dialog or <code>null</code> if this

     *     dialog has no title

     * @param modal specifes whether dialog blocks user input to other top-level

     *     windows when shown. If <code>false</code>, the dialog is <code>MODELESS</code>;