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annotate src/observer.c @ 1087:cd34de1a6960 openvg

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Fix issue of incorrect color for color paint. It is always black (nearly). It is caused by translate RGBA values from MadButterfly to OpenVG with wrong function.
author Thinker K.F. Li <thinker@codemud.net>
date Fri, 03 Dec 2010 18:18:43 +0800
parents e415c55b4a0d
children
rev   line source
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1 // -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*-
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2 // vim: sw=4:ts=8:sts=4
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3 #include <stdio.h>
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4 #include "mb_redraw_man.h"
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5 #include "mb_observer.h"
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6 #include "mb_tools.h"
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7
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8 #ifndef ASSERT
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9 #define ASSERT(x)
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10 #endif
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11
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12 subject_t *subject_new(observer_factory_t *factory, void *obj, int obj_type) {
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13 subject_t *subject;
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14
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15 subject = factory->subject_alloc(factory);
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16 if(subject == NULL)
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17 return NULL;
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18
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19 subject->obj = obj;
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20 subject->obj_type = obj_type;
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21 subject->flags = 0;
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22 subject->monitor_sub = NULL;
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23 STAILQ_INIT(subject->observers);
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24
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25 subject->factory = factory;
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26
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27 return subject;
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28 }
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29
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30 /*!
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31 * \todo Keep observer_factory following subject objects.
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32 */
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33 void subject_free(subject_t *subject) {
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34 observer_factory_t *factory = subject->factory;
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35 observer_t *observer;
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36 monitor_event_t mevt;
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37
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38 ASSERT(!(subject->flags & SUBF_FREE));
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39 if(subject->flags & SUBF_BUSY) {
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40 /* Postpond the request until busy status been stoped.
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41 * SUBF_BUSY means in subject_notify().
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42 */
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43 subject->flags |= SUBF_FREE;
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44 return;
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45 }
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46
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47 if(subject->monitor_sub) {
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48 mevt.event.type = EVT_MONITOR_FREE;
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49 mevt.subject = subject;
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50 mevt.observer = NULL;
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51 subject_notify(subject->monitor_sub, (event_t *)&mevt);
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52 }
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53
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54 while((observer = STAILQ_HEAD(subject->observers))) {
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55 STAILQ_REMOVE(subject->observers, observer_t, next, observer);
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56 factory->observer_free(factory, observer);
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57 }
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58 factory->subject_free(factory, subject);
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59 }
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61
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62 void subject_notify(subject_t *subject, event_t *evt) {
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63 observer_factory_t *factory = subject->factory;
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64 observer_t *observer;
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65 subject_t *old_subject;
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66 int stop_propagate = 0;
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67 int old_busy;
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68
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69 evt->tgt = subject;
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70 evt->flags = 0;
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71 while(subject) {
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72 /*!
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73 * \note What is happend when the subject is freed by observer?
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74 * Postponding the request of free until notification
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75 * been finished. (\ref SUBF_BUSY / \ref SUBF_FREE)
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76 */
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77 old_busy = subject->flags & SUBF_BUSY;
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78 subject->flags |= SUBF_BUSY;
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79
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80 evt->cur_tgt = subject;
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81 for(observer = STAILQ_HEAD(subject->observers);
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82 observer != NULL;
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83 observer = STAILQ_NEXT(observer_t, next, observer)) {
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84 if (observer->type == EVT_ANY || observer->type == evt->type) {
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85 observer->hdr(evt, observer->arg);
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86
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87 if(evt->flags & EVTF_STOP_NOTIFY) {
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88 stop_propagate = 1;
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89 break;
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90 }
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91 if(evt->flags & EVTF_STOP_PROPAGATE)
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92 stop_propagate = 1;
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93 }
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94 }
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95
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96 if(!old_busy)
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97 subject->flags &= ~SUBF_BUSY;
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98
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99 old_subject = subject;
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100 subject = factory->get_parent_subject(factory, subject);
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101
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102 if(old_subject->flags & SUBF_STOP_PROPAGATE)
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103 stop_propagate = 1;
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104
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105 if(old_subject->flags & SUBF_FREE)
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106 subject_free(old_subject);
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107
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108 if(stop_propagate)
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109 break;
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110 }
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111 }
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112
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113 /*! \brief Add an observer for specified type of events.
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114 */
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115 observer_t *subject_add_event_observer(subject_t *subject, int type,
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116 evt_handler hdr, void *arg) {
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117 observer_factory_t *factory = subject->factory;
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118 observer_t *observer;
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119 monitor_event_t mevt;
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120
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121 observer = factory->observer_alloc(factory);
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122 if(observer == NULL)
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123 return NULL;
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124 observer->hdr = hdr;
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125 observer->arg = arg;
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126 observer->type = type;
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127
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128 STAILQ_INS_TAIL(subject->observers, observer_t, next, observer);
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129
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130 if(subject->monitor_sub) {
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131 mevt.event.type = EVT_MONITOR_ADD;
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132 mevt.subject = subject;
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133 mevt.observer = observer;
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134 subject_notify(subject->monitor_sub, (event_t *)&mevt);
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135 }
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136
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137 return observer;
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138 }
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139
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140 /*! \brief Add an observer for specified type of events at head.
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141 */
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142 observer_t *subject_add_event_observer_head(subject_t *subject, int type,
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143 evt_handler hdr, void *arg) {
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144 observer_factory_t *factory = subject->factory;
224
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145 observer_t *observer;
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146 monitor_event_t mevt;
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147
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148 observer = factory->observer_alloc(factory);
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149 if(observer == NULL)
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150 return NULL;
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151 observer->hdr = hdr;
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152 observer->arg = arg;
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153 observer->type = type;
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154
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155 STAILQ_INS(subject->observers, observer_t, next, observer);
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156
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157 if(subject->monitor_sub) {
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158 mevt.event.type = EVT_MONITOR_ADD;
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159 mevt.subject = subject;
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160 mevt.observer = observer;
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161 subject_notify(subject->monitor_sub, (event_t *)&mevt);
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162 }
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163
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164 return observer;
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165 }
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166
192
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167 void subject_remove_observer(subject_t *subject,
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168 observer_t *observer) {
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169 observer_factory_t *factory = subject->factory;
224
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170 monitor_event_t mevt;
192
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171
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172 STAILQ_REMOVE(subject->observers, observer_t, next, observer);
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173
224
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174 if(subject->monitor_sub) {
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175 mevt.event.type = EVT_MONITOR_REMOVE;
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176 mevt.subject = subject;
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177 mevt.observer = observer;
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178 subject_notify(subject->monitor_sub, (event_t *)&mevt);
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179 }
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180
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181 factory->observer_free(factory, observer);
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182 }
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183
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184 #ifdef UNITTEST
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185
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186 #include <CUnit/Basic.h>
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187 #include <stdlib.h>
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188
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189 static subject_t *test_subject_alloc(observer_factory_t *factory) {
73
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190 subject_t *subject;
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191
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192 subject = (subject_t *)malloc(sizeof(subject_t));
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193 return subject;
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194 }
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195
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196 static void
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197 test_subject_free(observer_factory_t *factory, subject_t *subject) {
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198 free(subject);
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199 }
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200
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201 static observer_t *test_observer_alloc(observer_factory_t *factory) {
73
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202 observer_t *observer;
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203
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204 observer = (observer_t *)malloc(sizeof(observer_t));
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205 return observer;
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206 }
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207
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208 static void
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209 test_observer_free(observer_factory_t *factory, observer_t *observer) {
73
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210 free(observer);
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211 }
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212
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213 static subject_t *test_get_parent_subject(observer_factory_t *factory,
73
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214 subject_t *subject) {
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215 return NULL;
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216 }
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217
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218 static observer_factory_t test_factory = {
73
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219 test_subject_alloc,
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220 test_subject_free,
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221 test_observer_alloc,
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222 test_observer_free,
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223 test_get_parent_subject
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224 };
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225
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226 static void handler(event_t *evt, void *arg) {
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227 int *cnt = (int *)arg;
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228
74
3e3e074120a7 test case for observer
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diff changeset
229 CU_ASSERT(evt->type == EVT_MOUSE_OUT);
73
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230 (*cnt)++;
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231 }
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232
224
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diff changeset
233 static void test_observer(void) {
73
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234 subject_t *subject;
74
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235 observer_t *observer[2];
73
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236 event_t evt;
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237 int cnt = 0;
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238
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239 subject = subject_new(&test_factory, NULL, 0);
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240 subject->flags |= SUBF_STOP_PROPAGATE;
192
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diff changeset
241 observer[0] = subject_add_observer(subject, handler, &cnt);
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242 observer[1] = subject_add_observer(subject, handler, &cnt);
73
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243
74
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diff changeset
244 evt.type = EVT_MOUSE_OUT;
73
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245 evt.tgt = NULL;
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246 evt.cur_tgt = NULL;
192
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diff changeset
247 subject_notify(subject, &evt);
74
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diff changeset
248 CU_ASSERT(cnt == 2);
73
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249
192
54fdc2a65242 Remove factory from observer APIs.
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diff changeset
250 subject_remove_observer(subject, observer[0]);
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diff changeset
251 subject_remove_observer(subject, observer[1]);
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diff changeset
252 subject_free(subject);
73
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253 }
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254
224
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diff changeset
255 static void monitor_handler(event_t *evt, void *arg) {
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diff changeset
256 int *cnt = (int *)arg;
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diff changeset
257
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diff changeset
258 (*cnt)++;
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diff changeset
259 }
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diff changeset
260
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diff changeset
261 static void test_monitor(void) {
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diff changeset
262 subject_t *subject, *monitor;
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diff changeset
263 observer_t *observer[2];
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diff changeset
264 int cnt = 0;
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diff changeset
265
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diff changeset
266 subject = subject_new(&test_factory, NULL, 0);
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diff changeset
267 monitor = subject_new(&test_factory, NULL, 0);
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diff changeset
268 subject_set_monitor(subject, monitor);
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diff changeset
269
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diff changeset
270 observer[0] = subject_add_observer(monitor, monitor_handler, &cnt);
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271 observer[1] = subject_add_observer(subject, NULL, NULL);
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272 CU_ASSERT(cnt == 1);
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273
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274 subject_remove_observer(subject, observer[1]);
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275 CU_ASSERT(cnt == 2);
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276
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277 subject_free(subject);
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278 CU_ASSERT(cnt == 3);
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279
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280 subject_remove_observer(monitor, observer[0]);
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281 subject_free(monitor);
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282 }
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283
73
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284 CU_pSuite get_observer_suite(void) {
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285 CU_pSuite suite;
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286
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287 suite = CU_add_suite("Suite_observer", NULL, NULL);
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288 CU_ADD_TEST(suite, test_observer);
224
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289 CU_ADD_TEST(suite, test_monitor);
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290
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291 return suite;
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292 }
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293
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294 #endif /* UNITTEST */