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annotate mde/gui/content/Content.d @ 100:0ea4a3e651ae

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There is now a position marker for text editing. Changed the way fonts are configured. Actually, not much of the new way exists yet.
author Diggory Hardy <diggory.hardy@gmail.com>
date Sat, 15 Nov 2008 17:39:14 +0000
parents 5de5810e3516
children 71f0f1f83620
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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 − common types.
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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 //FIXME: efficient conversions? Need to dup result when formatting a string anyway?
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21 import Int = tango.text.convert.Integer;
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22 import Float = tango.text.convert.Float;
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23 import derelict.sdl.keysym;
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24
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25 debug {
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26 import tango.util.log.Log : Log, Logger;
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27 private Logger logger;
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28 static this () {
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29 logger = Log.getLogger ("mde.gui.content.Content");
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30 }
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31 }
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32
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33 /** IContent − interface for all Content classes.
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34 *
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35 * Services like copy/paste could work on universal content. However, they would need to run a
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36 * conversion to the appropriate type (or try next-oldest item on clipboard?).
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37 *
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38 * Currently Content instances can only have their data set on creation.
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39 * Each Content class should provide a method to get it's content, e.g. the method text().
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40 *
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41 * Extensions to content:
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42 *
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43 * These extensions require that a content can notify any dependants of changes.
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44 *
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45 * Use as a state switch (one option from an enumeration). E.g. a button/selection box could set a
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46 * state, and a tabbed box could show a tab based on this. Or could represent an option.
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47 */
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48 //TODO - write a generic IContent displaying widget. Also a generic editable?
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49 // Don't include dimension/drawing stuff because it's renderer specific and content should not be!
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50 // NOTE: an interface or a class?
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51 interface IContent
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52 {
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53 /+ NOTE: None of this is really used yet, but was (mostly) intended for clipboard copying.
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54 /** Return a copy of self. */
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55 IContent dup ();
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56
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57 /** Attempt to convert the content to a specific type (may simply return this if appropriate).
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58 *
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59 * Annoyingly we can't use cast because overloading by return type isn't supported. */
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60 // FIXME: throw or return null on error or unsupported conversion?
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61 ContentText toText ();
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62 ContentInt toInt (); /// ditto
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63 +/
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67 /** Generically return strings.
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68 *
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69 * This serves two purposes: generically returning a string of/related to the content (i == 0),
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70 * and returning associated descriptors. Functions should adhere to (or add to) this table.
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71 *
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72 * $(TABLE
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73 * $(TR $(TH i) $(TH returns))
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74 * $(TR $(TD 0) $(TD value))
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75 * $(TR $(TD 1) $(TD Translated name or null))
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76 * $(TR $(TD 2) $(TD Translated description or null))
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77 * $(TR $(TD other) $(TD null))
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78 * ) */
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79 char[] toString (uint i);
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80 }
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81
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82 /** Base class for content containing a simple value.
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83 *
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84 * All derived classes should support functions to set/get any ValueContent type, but return the
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85 * default value of any type other than it's own. */
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86 abstract class ValueContent : IContent
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87 {
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88 protected this () {}
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89
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90 void name (char[] n, char[] d = null) {
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91 name_ = n;
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92 desc_ = d;
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93 }
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94 protected:
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95 char[] name_, desc_;// name and description, loaded by lookup.Translation
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96 }
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97
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98 template VContentN(T) {
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99 static if (is(T == bool)) {
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100 const char[] VContentN = "BoolContent";
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101 } else static if (is(T == int)) {
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102 const char[] VContentN = "IntContent";
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103 } else static if (is(T == double)) {
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104 const char[] VContentN = "DoubleContent";
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105 } else static if (is(T == char[])) {
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106 const char[] VContentN = "TextContent";
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107 } else
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108 static assert (false, "No ValueContent of type "~T.stringof);
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109 }
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110
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111 class BoolContent : ValueContent
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112 {
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113 /** Create a content with _symbol name symbol. */
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114 this (char[] symbol, bool val = false) {
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115 symb = symbol;
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116 v = val;
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117 }
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118
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119 /** Adds cb to the list of callback functions called when the value is changed. Returns this. */
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120 BoolContent addChangeCb (void delegate (char[] symbol,bool value) cb) {
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121 cngCb ~= cb;
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122 return this;
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123 }
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124
94
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125 /// Get the text.
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126 char[] toString (uint i) {
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127 return (i == 0) ? v ? "true" : "false"
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128 : (i == 1) ? name_
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129 : (i == 2) ? desc_
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130 : null;
61
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131 }
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132
94
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133 void opAssign (bool val) {
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134 v = val;
95
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135 foreach (cb; cngCb)
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136 cb(symb, val);
94
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137 }
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138 bool opCall () {
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139 return v;
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140 }
98
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141 alias opCall opCast;
94
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142
95
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143 bool v; //FIXME: should be protected but Options needs to set without calling callbacks
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144 protected:
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145 char[] symb;
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146 void delegate (char[],bool)[] cngCb; // change callbacks
94
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147 }
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148
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149 /** Text content. */
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150 class TextContent : ValueContent
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151 {
98
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152 this (char[] symbol, char[] val = null) {
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153 symb = symbol;
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154 v = val;
99
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155 pos = v.length;
61
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156 }
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157
98
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158 /** Adds cb to the list of callback functions called when the value is changed. Returns this. */
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159 TextContent addChangeCb (void delegate (char[] symbol,char[] value) cb) {
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160 cngCb ~= cb;
61
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161 return this;
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162 }
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163
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164 /// Get the text.
94
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165 char[] toString (uint i) {
98
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166 return (i == 0) ? v
94
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167 : (i == 1) ? name_
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168 : (i == 2) ? desc_
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169 : null;
61
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170 }
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171
98
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diff changeset
172 void opAssign (char[] val) {
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173 v = val;
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diff changeset
174 foreach (cb; cngCb)
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175 cb(symb, val);
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176 }
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177 char[] opCall () {
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178 return v;
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179 }
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180 alias opCall opCast;
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181
99
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diff changeset
182 /** Acts on a keystroke and returns the new value.
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183 *
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184 * Supports one-line editing: left/right, home/end, backspace/delete. */
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185 char[] keyStroke (ushort sym, char[] i) {
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186 debug assert (i.length, "TextContent.keyStroke: no value (??)"); // impossible?
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187 char k = *i;
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188 if (k > 0x20) {
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189 if (k == 0x7f) { // delete
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190 size_t p = pos;
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diff changeset
191 if (p < v.length) ++p;
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192 while (p < v.length && (v[p] & 0x80) && !(v[p] & 0x40))
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193 ++p;
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194 v = v[0..pos] ~ v[p..$];
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195 } else { // insert character
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196 char[] tail = v[pos..$];
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diff changeset
197 v.length = v.length + i.length;
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198 size_t npos = pos+i.length;
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199 if (tail) v[npos..$] = tail.dup; // cannot assign with overlapping ranges
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200 v[pos..npos] = i;
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diff changeset
201 pos = npos;
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202 }
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diff changeset
203 } else { // use sym; many keys output 0
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diff changeset
204 if (sym == SDLK_BACKSPACE) { // backspace; k == 0x8
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diff changeset
205 char[] tail = v[pos..$];
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diff changeset
206 if (pos) --pos;
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diff changeset
207 while (pos && (v[pos] & 0x80) && !(v[pos] & 0x40))
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diff changeset
208 --pos;
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diff changeset
209 v = v[0..pos] ~ tail;
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diff changeset
210 } else if (sym == SDLK_LEFT) {
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parents: 98
diff changeset
211 if (pos) --pos;
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diff changeset
212 while (pos && (v[pos] & 0x80) && !(v[pos] & 0x40))
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parents: 98
diff changeset
213 --pos;
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parents: 98
diff changeset
214 } else if (sym == SDLK_RIGHT) {
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parents: 98
diff changeset
215 if (pos < v.length) ++pos;
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parents: 98
diff changeset
216 while (pos < v.length && (v[pos] & 0x80) && !(v[pos] & 0x40))
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parents: 98
diff changeset
217 ++pos;
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parents: 98
diff changeset
218 } else if (sym == SDLK_HOME || sym == SDLK_UP) {
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parents: 98
diff changeset
219 pos = 0;
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parents: 98
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220 } else if (sym == SDLK_END || sym == SDLK_DOWN) {
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parents: 98
diff changeset
221 pos = v.length;
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diff changeset
222 } else
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parents: 98
diff changeset
223 debug logger.trace ("Symbol: {}", sym);
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diff changeset
224 }
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parents: 98
diff changeset
225 return v;
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parents: 98
diff changeset
226 }
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parents: 98
diff changeset
227
100
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parents: 99
diff changeset
228 size_t getEditIndex () {
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diff changeset
229 size_t i = 0;
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parents: 99
diff changeset
230 for (size_t p = 0; p < pos; ++p)
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parents: 99
diff changeset
231 if (!(v[p] & 0x80) || v[p] & 0x40)
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parents: 99
diff changeset
232 ++i;
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Diggory Hardy <diggory.hardy@gmail.com>
parents: 99
diff changeset
233 return i;
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Diggory Hardy <diggory.hardy@gmail.com>
parents: 99
diff changeset
234 }
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Diggory Hardy <diggory.hardy@gmail.com>
parents: 99
diff changeset
235
99
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parents: 98
diff changeset
236 /// Gives all callbacks the modified value
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parents: 98
diff changeset
237 void endEdit () {
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parents: 98
diff changeset
238 foreach (cb; cngCb)
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parents: 98
diff changeset
239 cb(symb, v);
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240 }
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241
98
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242 char[] v;
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243 protected:
98
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244 char[] symb;
99
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245 size_t pos; // editing position; used by keyStroke
98
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246 void delegate (char[],char[])[] cngCb;
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247 }
98
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248
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249 /** Integer content. */
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250 class IntContent : ValueContent
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251 {
98
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252 /** Create a content with _symbol name symbol. */
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253 this (char[] symbol, int val = 0) {
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254 symb = symbol;
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255 v = val;
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256 }
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257
98
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258 /** Adds cb to the list of callback functions called when the value is changed. Returns this. */
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259 IntContent addChangeCb (void delegate (char[] symbol,int value) cb) {
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260 cngCb ~= cb;
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261 return this;
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262 }
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263
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264 /// Get the text.
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265 char[] toString (uint i) {
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266 return (i == 0) ? Int.toString (v)
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267 : (i == 1) ? name_
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268 : (i == 2) ? desc_
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269 : null;
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270 }
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271
98
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272 void opAssign (int val) {
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273 v = val;
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274 foreach (cb; cngCb)
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275 cb(symb, val);
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276 }
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277 int opCall () {
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278 return v;
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279 }
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280 alias opCall opCast;
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281
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282 int v;
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283 protected:
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284 char[] symb;
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285 void delegate (char[],int)[] cngCb;
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286 }
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287
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288 /** Double content. */
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289 class DoubleContent : ValueContent
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290 {
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291 /** Create a content with _symbol name symbol. */
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292 this (char[] symbol, double val = 0) {
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293 symb = symbol;
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294 v = val;
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295 }
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296
98
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297 /** Adds cb to the list of callback functions called when the value is changed. Returns this. */
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298 DoubleContent addChangeCb (void delegate (char[] symbol,double value) cb) {
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299 cngCb ~= cb;
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300 return this;
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301 }
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302
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303 /// Get the text.
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304 char[] toString (uint i) {
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305 return (i == 0) ? Float.toString (v)
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306 : (i == 1) ? name_
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307 : (i == 2) ? desc_
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308 : null;
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309 }
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310
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311 void opAssign (double val) {
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312 v = val;
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313 foreach (cb; cngCb)
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314 cb(symb, val);
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315 }
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316 double opCall () {
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317 return v;
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318 }
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319 alias opCall opCast;
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320
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diff changeset
321 double v;
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322 protected:
98
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323 char[] symb;
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324 void delegate (char[],double)[] cngCb;
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325 }