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annotate mde/gui/content/Content.d @ 90:b525ff28774b

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Widgets generated dynamically from a list can now be standard widgets selected from data files. Started on allowing alignment to be shared between instances of a layout widget in a dynamic list (to allow column alignment of list's rows).
author Diggory Hardy <diggory.hardy@gmail.com>
date Wed, 01 Oct 2008 23:37:51 +0100
parents 159775502bb4
children 4d5d53e4f881
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1 /* LICENSE BLOCK
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2 Part of mde: a Modular D game-oriented Engine
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3 Copyright © 2007-2008 Diggory Hardy
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4
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5 This program is free software: you can redistribute it and/or modify it under the terms
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6 of the GNU General Public License as published by the Free Software Foundation, either
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7 version 2 of the License, or (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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10 without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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11 See the GNU General Public License for more details.
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12
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13 You should have received a copy of the GNU General Public License
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14 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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15
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16 /** The content system − type agnostic part.
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17 */
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18 module mde.gui.content.Content;
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19
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20 import Int = tango.text.convert.Integer;
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21
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22 /** Content − universal part.
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23 *
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24 * Services like copy/paste could work on universal content. However, they would need to run a
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25 * conversion to the appropriate type (or try next-oldest item on clipboard?).
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26 *
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27 * Currently Content instances can only have their data set on creation.
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28 * Each Content class should provide a method to get it's content, e.g. the method text().
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29 *
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30 * Extensions to content:
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31 *
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32 * These extensions require that a content can notify any dependants of changes.
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33 *
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34 * Use as a state switch (one option from an enumeration). E.g. a button/selection box could set a
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35 * state, and a tabbed box could show a tab based on this. Or could represent an option.
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36 */
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37 // Don't include dimension/drawing stuff because it's renderer specific and content should not be!
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38 // NOTE: an interface or a class?
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39 interface IContent
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40 {
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41 /+ NOTE: None of this is really used yet, but was (mostly) intended for clipboard copying.
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42 /** Return a copy of self. */
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43 IContent dup ();
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44
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45 /** Attempt to convert the content to a specific type (may simply return this if appropriate).
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46 *
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47 * Annoyingly we can't use cast because overloading by return type isn't supported. */
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48 // FIXME: throw or return null on error or unsupported conversion?
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49 ContentText toText ();
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50 ContentInt toInt (); /// ditto
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51 +/
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52
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53 /** Every Content should be convertible to a string, which, if possible, should be a sensible
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54 * conversion of its content. */
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55 char[] toString ();
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56 }
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57
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58 /** Get a content from the list (what list?). */
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59 ContentText getContentText (char[] id) {
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60 return new ContentText (id); // forget the list for now
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61 }
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63 /** ditto */
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64 ContentInt getContentInt (char[] id) {
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65 return new ContentInt (42); // forget the list for now
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66 }
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67
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68 /** Text content. */
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69 /* May end up extending a universal content type.
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70 * Services like copy/paste could work on universal content.
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71 *
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72 * NOTE: Needs to be a reference type really.
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73 * Could alternately be:
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74 * alias ContentTextStruct* ContentText
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75 * where ContentTextStruct is a struct. */
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76 class ContentText : IContent
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77 {
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78 this () {}
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79 this (char[] text) {
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80 text_ = text;
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81 }
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82
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83 ContentText dup () {
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84 return new ContentText (text_);
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85 }
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86
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87 ContentText toText () {
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88 return this;
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89 }
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90 ContentInt toInt () {
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91 // FIXME: convert
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92 return null;
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93 }
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94
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95 alias toString text;
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96
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97 /// Get the text.
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98 char[] toString () {
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99 return text_;
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100 }
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101
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102 protected:
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103 //NOTE: need to allow cache-invalidating when text changes!
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104 char[] text_;
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105 }
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106
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107 /** Integer content. */
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108 class ContentInt : IContent
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109 {
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110 this () {}
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111 this (int integer) {
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112 int_ = integer;
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113 }
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114
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115 ContentInt dup () {
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116 return new ContentInt (int_);
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117 }
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118
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119 ContentText toText () {
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120 return new ContentText(toString);
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121 }
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122 ContentInt toInt () {
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123 return this;
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124 }
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125
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126 /// Get the integer.
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127 int integer () {
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128 return int_;
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129 }
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130
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131 char[] toString () {
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132 return Int.toString (int_);
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133 }
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134
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135 protected:
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136 int int_;
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137 }