1 | /*
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2 | * ModalDialog
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3 | *
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4 | * GLI 2.3c
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5 | *
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6 | * 30May2003
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7 | *
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8 | *#########################################################################
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9 | *
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10 | * A component of the Gatherer application, part of the Greenstone digital
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11 | * library suite from the New Zealand Digital Library Project at the
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12 | * University of Waikato, New Zealand.
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13 | *
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14 | * Author: John Thompson, Greenstone Digital Library, University of Waikato
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15 | *
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16 | * Copyright (C) 1999 New Zealand Digital Library Project
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17 | *
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18 | * This program is free software; you can redistribute it and/or modify
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19 | * it under the terms of the GNU General Public License as published by
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20 | * the Free Software Foundation; either version 2 of the License, or
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21 | * (at your option) any later version.
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22 | *
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23 | * This program is distributed in the hope that it will be useful,
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24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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26 | * GNU General Public License for more details.
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27 | *
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28 | * You should have received a copy of the GNU General Public License
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29 | * along with this program; if not, write to the Free Software
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30 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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31 | *########################################################################
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32 | */
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33 | package org.greenstone.gatherer.gui;
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34 | import java.awt.*;
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35 | import javax.swing.*;
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36 | /** An extension of the JDialog that overrides the JVM's typical modal behaviour. This typical behaviour is that when a modal dialog is opened, all other windows cease to respond to user events until the modal dialog is disposed. However this prevents us opening the help documents property whenever a modal dialog is open. Thus we override the modal behaviour so that only the owner frame or dialog is blocked. */
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37 | public class ModalDialog
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38 | extends JDialog {
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39 | /** true if this dialog should be modal, ie block user actions to its owner window, false otherwise. */
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40 | protected boolean modal = false;
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41 |
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42 | /** Constructor.
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43 | * @param parent the Dialog which is the owener of this dialog.
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44 | * @param title the String to use as the title for this dialog.
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45 | */
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46 | public ModalDialog(Dialog parent, String title) {
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47 | super (parent, title, false);
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48 | this.modal = false;
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49 | }
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50 |
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51 | /** Constructor.
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52 | * @param parent the Dialog which is the owener of this dialog.
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53 | * @param title the String to use as the title for this dialog.
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54 | * @param modal true if this dialog should be modal, ie block user actions to its owner window, false otherwise.
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55 | */
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56 | public ModalDialog(Dialog parent, String title, boolean modal) {
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57 | super (parent, title, false);
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58 | this.modal = modal;
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59 | }
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60 |
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61 | /** Constructor.
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62 | * @param parent the Frame which is the owener of this dialog.
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63 | * @param title the String to use as the title for this dialog.
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64 | * @param modal true if this dialog should be modal, ie block user actions to its owner window, false otherwise.
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65 | */
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66 | public ModalDialog(Frame parent, String title, boolean modal) {
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67 | super (parent, title, false);
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68 | this.modal = modal;
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69 | }
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70 |
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71 | /** The set visible method is overriden to provide modal functionality. It essentially hijacks control of the event dispatch thread while the dialog is open, only allowing non-user events to be passed to the parent dialog. Furthermore it only has this effect within the current AWT component tree by utilitizing the TreeLock.
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72 | * @param visible true if this dialog should be painted on-screen, false otherwise.
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73 | */
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74 | public void setVisible (boolean visible) {
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75 | getParent ().setEnabled (!(visible && modal));
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76 | super.setVisible (visible);
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77 | if (modal && visible)
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78 | try {
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79 | if (SwingUtilities.isEventDispatchThread ()) {
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80 | EventQueue theQueue = getToolkit().getSystemEventQueue();
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81 | while (isVisible ()) {
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82 | AWTEvent event = theQueue.getNextEvent();
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83 | Object src = event.getSource ();
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84 | if (event instanceof ActiveEvent) {
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85 | ((ActiveEvent) event).dispatch ();
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86 | } else if (src instanceof Component) {
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87 | ((Component) src).dispatchEvent (event);
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88 | }
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89 | }
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90 | } else synchronized (getTreeLock ()) {
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91 | while (isVisible ())
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92 | try {
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93 | getTreeLock().wait();
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94 | } catch (InterruptedException e) {
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95 | break;
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96 | }
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97 | }
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98 | } catch (Exception ex) {
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99 | ex.printStackTrace();
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100 | }
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101 | }
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102 |
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103 | /** Overridden method so we can control modality and not rely on the Dialog default.
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104 | * @param modal true if this dialog should be modal, ie block user actions to its owner window, false otherwise.
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105 | */
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106 | public void setModal (boolean modal) {
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107 | this.modal = modal;
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108 | }
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109 | }
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