1 | /**********************************************************************
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2 | *
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3 | * ResultDisplay.java -- Phrase list holder for Phind java applet
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4 | *
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5 | * Copyright 1997-2000 Gordon W. Paynter
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6 | * Copyright 2000 The New Zealand Digital Library Project
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7 | *
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8 | * A component of the Greenstone digital library software
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9 | * from the New Zealand Digital Library Project at the
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10 | * University of Waikato, New Zealand.
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11 | *
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12 | * This program is free software; you can redistribute it and/or modify
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13 | * it under the terms of the GNU General Public License as published by
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14 | * the Free Software Foundation; either version 2 of the License, or
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15 | * (at your option) any later version.
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16 | *
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17 | * This program is distributed in the hope that it will be useful,
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18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 | * GNU General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, write to the Free Software
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24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 | *
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26 | *********************************************************************/
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27 |
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28 | /*********************************************************************
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29 |
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30 | This class is used in the Phind java applet (Phind.java).
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31 |
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32 | A ResultDisplay is a Panel that can display a single Component, which will
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33 | be a ResultBox or PhindTitle object.
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34 |
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35 | ResultBoxes can be "chained" together with their "prev" and "next" fields,
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36 | allowing us to have an arbitrary number of "displays" in which to show
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37 | phrase lists.
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38 |
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39 | Main methods:
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40 | * emptyContents will remove the component and emptyAll the "next" display
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41 | * display will add an item to the first (ie: most "prev") available box
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42 |
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43 | **********************************************************************/
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44 |
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45 |
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46 | import java.awt.Panel;
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47 | import java.awt.BorderLayout;
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48 | import java.awt.Component;
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49 |
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50 | class ResultDisplay extends Panel {
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51 |
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52 | Phind phind;
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53 | ResultDisplay prev, next;
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54 | Component current;
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55 | boolean empty;
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56 |
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57 | // Create a new Display
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58 | ResultDisplay(Phind ph, ResultDisplay pr) {
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59 | phind = ph;
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60 | prev = pr;
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61 | next = null;
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62 | if (prev != null) prev.next = this;
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63 | setLayout(new BorderLayout());
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64 |
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65 | empty = true;
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66 | current = new PhindTitle(ph);
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67 | add(current);
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68 | }
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69 |
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70 | // Empty the contents of the display,
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71 | // and all the next displays
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72 | void emptyContents() {
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73 | if (empty == false) {
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74 | empty = true;
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75 | current = new PhindTitle(phind);
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76 | removeAll();
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77 | add(current);
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78 | }
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79 | if (next != null) next.emptyContents();
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80 | }
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81 |
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82 | // Set the contents of this display
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83 | Component setContents( Component r ) {
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84 | removeAll();
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85 | add("Center", r);
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86 | current = r;
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87 | empty = false;
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88 | if (r.getClass().getName().equals("ResultBox")) {
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89 | ((ResultBox) r).display = this;
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90 | }
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91 | return r;
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92 | }
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93 |
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94 |
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95 |
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96 | // Display a component in the "most previous" display
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97 | ResultDisplay display( Component r ) {
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98 |
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99 | if (prev == null) {
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100 | // if there is no previous box, add the component here
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101 | setContents(r);
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102 | return this;
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103 |
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104 | } else if (prev.empty == true) {
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105 | // if the previous box is empty, add the component to it instead
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106 | return prev.display(r);
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107 |
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108 | } else if (empty == true) {
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109 | // if this box is empty, add the compnent to it
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110 | setContents(r);
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111 | return this;
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112 |
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113 | } else {
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114 | // if this box is occupied,
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115 | // shift it's contents prev-wards and add here.
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116 | prev.display(current);
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117 | setContents(r);
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118 | return this;
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119 | }
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120 | }
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121 |
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122 | }
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123 |
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124 |
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125 |
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