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annotate mde/gui/WidgetLoader.d @ 175:1cbde9807293

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Compile/link-time fixes for ldc & non-debug builds. Moved WidgetManager to widget/ Reverted IChildWidget to an interface, not an abstract class. Introduced a work-around for a compiler problem. May not cover all cases.
author Diggory Hardy <diggory.hardy@gmail.com>
date Fri, 11 Sep 2009 20:56:53 +0200
parents 3d58adc17d20
children
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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 /******************************************************************************
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17 * A gui manager extension to load widgets from files.
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18 *
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19 * Public methods in this class should be thread safe (by locking on a mutex).
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20 *****************************************************************************/
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21 module mde.gui.WidgetLoader;
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22
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23 import mde.gui.widget.WidgetManager;
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24 import mde.gui.WidgetDataSet;
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25 import mde.gui.exception;
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26
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27 import mt = mde.file.mergetag.DataSet;
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28 import mde.file.mergetag.Reader;
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29 import mde.file.mergetag.Writer;
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30 import mde.file.paths;
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31
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32 import tango.util.log.Log : Log, Logger;
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33
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34 private Logger logger;
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35 static this () {
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36 logger = Log.getLogger ("mde.gui.WidgetLoader");
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37 }
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38
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39 /******************************************************************************
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40 * Contains the code for loading and saving an entire gui (more than one may
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41 * exist), but not the code for drawing it or handling user input.
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42 *
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43 * This abstract class exists solely for separating out some of the functionality.
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44 *****************************************************************************/
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45 abstract scope class AWidgetLoader : AWidgetManager
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46 {
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47 /** Construct a new widget loader.
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48 *
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49 * params:
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50 * fileName = Name of file specifying the gui, excluding path and extension.
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51 */
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52 protected this (char[] file) {
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53 mutex = new Mutex; // Used on functions intended to be called from outside the gui package.
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54 fileName = file;
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55 super (file);
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56 }
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57
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58 /* Load the widgets' data from the file specified to the CTOR.
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59 *
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60 * params:
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61 * allDesigns = Load all sections
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62 */
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63 private void loadData (bool allDesigns = false) {
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64 if (allLoaded || (defaultDesign !is null && allDesigns == false))
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65 return; // test if already loaded
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66
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67 // Set up a reader
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68 scope IReader reader;
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69 try {
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70 reader = confDir.makeMTReader (fileName, PRIORITY.HIGH_LOW, null, true);
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71
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72 // Read from the HEADER:
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73 // Get the renderer
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74 char[]* p = "Renderer" in reader.dataset.header._charA;
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75 if (p is null || *p is null) {
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76 logger.warn ("No renderer specified: using \"Simple\"");
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77 rendName = "Simple";
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78 }
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79 else
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80 rendName = *p;
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81
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82 // Get which section to use
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83 p = "Design" in reader.dataset.header._charA;
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84 if (p is null || *p is null) {
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85 logger.warn ("No gui design specified: trying \"Default\"");
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86 defaultDesign = "Default";
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87 }
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88 else
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89 defaultDesign = *p;
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90
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91 // Read the body:
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92 // Load the chosen design
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93 reader.dataSecCreator = delegate mt.IDataSection(mt.ID id) {
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94 WidgetDataSet* p = id in data;
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95 if (p is null) {
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96 data[id] = new WidgetDataSet;
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97 return *(id in data);
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98 }
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99 return *p;
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100 };
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101
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102 if (allDesigns) {
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103 reader.read;
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104 allLoaded = true;
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105 } else
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106 reader.read([defaultDesign]);
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107 } catch (NoFileException) {
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108 logger.error ("Unable to load GUI: no config file: "~fileName);
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109 // just return: not a fatal error (so long as the game can run without a GUI!)
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110 } catch (Exception e) {
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111 logger.error ("Unable to load GUI: errors parsing config file ("~confDir.getFileName(fileName,PRIORITY.HIGH_LOW)~"):");
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112 logger.error (e.msg);
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113 throw new GuiException ("Failure parsing config file");
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114 }
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115 }
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116
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117 /** Load the gui from some design.
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118 *
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119 * If a design was previously loaded, its changes are saved first.
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120 *
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121 * Params:
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122 * name = Design to load. If null, the default will be loaded.
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123 */
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124 void loadDesign (char[] name = null) {
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125 if (changes !is null) // A design was previously loaded
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126 save; // own lock
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127
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128 mutex.lock;
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129 scope(exit) mutex.unlock;
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130
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131 // Load data (loadData tests if it's already loaded first):
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132 if (name is null) {
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133 loadData (false);
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134 name = defaultDesign;
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135 } else
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136 loadData (true);
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137
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138
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139 // Get data:
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140 auto p = name in data;
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141 while (p is null) {
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142 if (name == defaultDesign)
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143 throw new GuiException ("Unable to load [specified or] default design");
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144 name = defaultDesign; // try again with the default
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145 p = name in data;
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146 }
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147 curData = *p;
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148
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149 // Get/create a changes section:
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150 if (changesDS is null)
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151 changesDS = new mt.DataSet;
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152
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153 mt.IDataSection* q = name in changesDS.sec;
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154 if (!q || ((changes = cast(WidgetDataChanges) *q) is null)) {
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155 changes = new WidgetDataChanges (curData);
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156 changesDS.sec[name] = changes;
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157 }
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158
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159 // Create the widgets:
171
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160 createWidgets;
159
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161 }
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162
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163 /** Save changes, if any exist.
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164 *
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165 * Is run when the manager is destroyed, but could be run at other times too. */
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166 void save () {
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167 preSave;
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168
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169 mutex.lock;
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170 scope(exit) mutex.unlock;
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171
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172 // Make all widgets save any changed data:
171
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173 saveChanges;
159
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174
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175 if (changes.noChanges)
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176 return;
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177
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178 if (loadUserFile) { // merge entries from user file into current changes
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179 try {
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180 scope IReader reader = confDir.makeMTReader (
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181 fileName, PRIORITY.HIGH_ONLY, changesDS, true);
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182
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183 // Create if necessary, only corresponding to existing designs read:
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184 reader.dataSecCreator = delegate mt.IDataSection(mt.ID id) {
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185 WidgetDataSet* p = id in data;
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186 if (p is null)
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187 throw new Exception ("File has changed since it was loaded!");
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188 return new WidgetDataChanges (*p);
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189 };
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190
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191 reader.read;
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192 } catch (NoFileException) {
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193 // No user file exists; not an error.
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194 } catch (Exception e) {
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195 logger.error ("Error reading "~confDir.getFileName(fileName,PRIORITY.HIGH_ONLY)~" prior to saving:");
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196 logger.error (e.msg);
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197 logger.error ("Overwriting the file.");
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198 // Continue...
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199 }
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200 loadUserFile = false; // don't need to do it again
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201 }
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202
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203 try { // Save
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204 IWriter writer;
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205 writer = confDir.makeMTWriter (fileName, changesDS);
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206 writer.write;
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207 } catch (Exception e) {
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208 logger.error ("Saving to "~confDir.getFileName(fileName,PRIORITY.HIGH_ONLY)~" failed:");
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209 logger.error (e.msg);
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210 // No point in throwing since it doesn't affect anything else.
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211 }
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212 }
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213
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214 /** Get the names of all designs available. */
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215 char[][] designs() {
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216 synchronized(mutex) {
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217 loadData (true);
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218 return data.keys;
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219 }
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220 }
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221
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222 protected:
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223 // Called by derived classes, not thread safe for the same instance
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224 //BEGIN WidgetManagement methods
171
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225 /** Called before saving to make sure no data is being edited (and thus
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226 * would not be saved). */
175
1cbde9807293 Compile/link-time fixes for ldc & non-debug builds.
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227 abstract void preSave ();
159
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228 //END WidgetManagement methods
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229
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230
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231 // Dataset/design data:
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232 final char[] fileName;
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233 char[] defaultDesign; // The design specified in the file header.
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234
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235 // Loaded data, indexed by design name. May not be loaded for all gui designs:
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236 scope WidgetDataSet[char[]] data;
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237 private bool allLoaded = false; // applies to data
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238 scope mt.DataSet changesDS; // changes and sections from user file (used for saving)
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239 bool loadUserFile = true; // still need to load user file for saving?
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240 }