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annotate src/observer.c @ 546:249bcbf07eb0 Android_Skia

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Reuse and adapt X_supp.c by implmeneting X_supp_njs.c
author Thinker K.F. Li <thinker@branda.to>
date Sat, 05 Jun 2010 22:24:04 +0800
parents 29e1b2bffe4c
children 586e50f82c1f
rev   line source
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1 #include <stdio.h>
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2 #include "mb_redraw_man.h"
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3 #include "mb_observer.h"
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4 #include "mb_tools.h"
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5
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6 #ifndef ASSERT
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7 #define ASSERT(x)
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8 #endif
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9
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10 subject_t *subject_new(ob_factory_t *factory, void *obj, int obj_type) {
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11 subject_t *subject;
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12
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13 subject = factory->subject_alloc(factory);
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14 if(subject == NULL)
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15 return NULL;
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16
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17 subject->obj = obj;
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18 subject->obj_type = obj_type;
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19 subject->flags = 0;
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20 subject->monitor_sub = NULL;
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21 STAILQ_INIT(subject->observers);
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22
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23 subject->factory = factory;
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24
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25 return subject;
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26 }
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27
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28 /*!
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29 * \todo Keep ob_factory following subject objects.
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30 */
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31 void subject_free(subject_t *subject) {
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32 ob_factory_t *factory = subject->factory;
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33 observer_t *observer;
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34 monitor_event_t mevt;
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35
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36 ASSERT(!(subject->flags & SUBF_FREE));
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37 if(subject->flags & SUBF_BUSY) {
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38 /* Postpond the request until busy status been stoped.
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39 * SUBF_BUSY means in subject_notify().
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40 */
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41 subject->flags |= SUBF_FREE;
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42 return;
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43 }
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44
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45 if(subject->monitor_sub) {
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46 mevt.event.type = EVT_MONITOR_FREE;
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47 mevt.subject = subject;
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48 mevt.observer = NULL;
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49 subject_notify(subject->monitor_sub, (event_t *)&mevt);
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50 }
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51
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52 while((observer = STAILQ_HEAD(subject->observers))) {
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53 STAILQ_REMOVE(subject->observers, observer_t, next, observer);
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54 factory->observer_free(factory, observer);
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55 }
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56 factory->subject_free(factory, subject);
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57 }
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58
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59
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60 void subject_notify(subject_t *subject, event_t *evt) {
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61 ob_factory_t *factory = subject->factory;
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62 observer_t *observer;
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63 subject_t *old_subject;
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64 int stop_propagate = 0;
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65 int old_busy;
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66
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67 evt->tgt = subject;
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68 evt->flags = 0;
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69 while(subject) {
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70 /*!
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71 * \note What is happend when the subject is freed by observer?
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72 * Postponding the request of free until notification
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73 * been finished. (\ref SUBF_BUSY / \ref SUBF_FREE)
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74 */
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75 old_busy = subject->flags & SUBF_BUSY;
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76 subject->flags |= SUBF_BUSY;
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77
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78 evt->cur_tgt = subject;
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79 for(observer = STAILQ_HEAD(subject->observers);
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80 observer != NULL;
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81 observer = STAILQ_NEXT(observer_t, next, observer)) {
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82 if (observer->type == EVT_ANY || observer->type == evt->type) {
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83 observer->hdr(evt, observer->arg);
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84
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85 if(evt->flags & EVTF_STOP_NOTIFY) {
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86 stop_propagate = 1;
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87 break;
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88 }
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89 if(evt->flags & EVTF_STOP_PROPAGATE)
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90 stop_propagate = 1;
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91 }
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92 }
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93
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94 if(!old_busy)
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95 subject->flags &= ~SUBF_BUSY;
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96
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97 old_subject = subject;
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98 subject = factory->get_parent_subject(factory, subject);
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99
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100 if(old_subject->flags & SUBF_STOP_PROPAGATE)
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101 stop_propagate = 1;
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102
194
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103 if(old_subject->flags & SUBF_FREE)
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104 subject_free(old_subject);
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105
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106 if(stop_propagate)
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107 break;
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108 }
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109 }
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110
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111 /*! \brief Add an observer for specified type of events.
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112 */
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113 observer_t *subject_add_event_observer(subject_t *subject, int type,
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114 evt_handler hdr, void *arg) {
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115 ob_factory_t *factory = subject->factory;
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116 observer_t *observer;
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117 monitor_event_t mevt;
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118
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119 observer = factory->observer_alloc(factory);
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120 if(observer == NULL)
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121 return NULL;
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122 observer->hdr = hdr;
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123 observer->arg = arg;
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124 observer->type = type;
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125
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126 STAILQ_INS_TAIL(subject->observers, observer_t, next, observer);
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127
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128 if(subject->monitor_sub) {
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129 mevt.event.type = EVT_MONITOR_ADD;
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130 mevt.subject = subject;
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131 mevt.observer = observer;
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132 subject_notify(subject->monitor_sub, (event_t *)&mevt);
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133 }
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134
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135 return observer;
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136 }
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137
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138 /*! \brief Add an observer for specified type of events at head.
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139 */
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140 observer_t *subject_add_event_observer_head(subject_t *subject, int type,
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141 evt_handler hdr, void *arg) {
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142 ob_factory_t *factory = subject->factory;
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143 observer_t *observer;
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144 monitor_event_t mevt;
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145
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146 observer = factory->observer_alloc(factory);
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147 if(observer == NULL)
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148 return NULL;
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149 observer->hdr = hdr;
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150 observer->arg = arg;
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151 observer->type = type;
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152
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153 STAILQ_INS(subject->observers, observer_t, next, observer);
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154
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155 if(subject->monitor_sub) {
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156 mevt.event.type = EVT_MONITOR_ADD;
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157 mevt.subject = subject;
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158 mevt.observer = observer;
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159 subject_notify(subject->monitor_sub, (event_t *)&mevt);
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160 }
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161
73
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162 return observer;
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163 }
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164
192
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165 void subject_remove_observer(subject_t *subject,
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166 observer_t *observer) {
192
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167 ob_factory_t *factory = subject->factory;
224
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168 monitor_event_t mevt;
192
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169
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170 STAILQ_REMOVE(subject->observers, observer_t, next, observer);
224
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171
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172 if(subject->monitor_sub) {
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173 mevt.event.type = EVT_MONITOR_REMOVE;
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174 mevt.subject = subject;
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175 mevt.observer = observer;
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176 subject_notify(subject->monitor_sub, (event_t *)&mevt);
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177 }
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178
73
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179 factory->observer_free(factory, observer);
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180 }
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181
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182 #ifdef UNITTEST
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183
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184 #include <CUnit/Basic.h>
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185 #include <stdlib.h>
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186
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187 static subject_t *test_subject_alloc(ob_factory_t *factory) {
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188 subject_t *subject;
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189
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190 subject = (subject_t *)malloc(sizeof(subject_t));
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191 return subject;
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192 }
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193
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194 static void test_subject_free(ob_factory_t *factory, subject_t *subject) {
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195 free(subject);
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196 }
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197
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198 static observer_t *test_observer_alloc(ob_factory_t *factory) {
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199 observer_t *observer;
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200
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201 observer = (observer_t *)malloc(sizeof(observer_t));
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202 return observer;
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203 }
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204
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205 static void test_observer_free(ob_factory_t *factory, observer_t *observer) {
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206 free(observer);
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207 }
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208
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209 static subject_t *test_get_parent_subject(ob_factory_t *factory,
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210 subject_t *subject) {
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211 return NULL;
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212 }
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213
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214 static ob_factory_t test_factory = {
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215 test_subject_alloc,
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216 test_subject_free,
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217 test_observer_alloc,
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218 test_observer_free,
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219 test_get_parent_subject
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220 };
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221
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222 static void handler(event_t *evt, void *arg) {
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223 int *cnt = (int *)arg;
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224
74
3e3e074120a7 test case for observer
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225 CU_ASSERT(evt->type == EVT_MOUSE_OUT);
73
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226 (*cnt)++;
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227 }
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228
224
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diff changeset
229 static void test_observer(void) {
73
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230 subject_t *subject;
74
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diff changeset
231 observer_t *observer[2];
73
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232 event_t evt;
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233 int cnt = 0;
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234
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235 subject = subject_new(&test_factory, NULL, 0);
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236 subject->flags |= SUBF_STOP_PROPAGATE;
192
54fdc2a65242 Remove factory from observer APIs.
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diff changeset
237 observer[0] = subject_add_observer(subject, handler, &cnt);
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diff changeset
238 observer[1] = subject_add_observer(subject, handler, &cnt);
73
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239
74
3e3e074120a7 test case for observer
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diff changeset
240 evt.type = EVT_MOUSE_OUT;
73
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241 evt.tgt = NULL;
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242 evt.cur_tgt = NULL;
192
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diff changeset
243 subject_notify(subject, &evt);
74
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diff changeset
244 CU_ASSERT(cnt == 2);
73
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245
192
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diff changeset
246 subject_remove_observer(subject, observer[0]);
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diff changeset
247 subject_remove_observer(subject, observer[1]);
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diff changeset
248 subject_free(subject);
73
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249 }
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250
224
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diff changeset
251 static void monitor_handler(event_t *evt, void *arg) {
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diff changeset
252 int *cnt = (int *)arg;
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253
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diff changeset
254 (*cnt)++;
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diff changeset
255 }
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diff changeset
256
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diff changeset
257 static void test_monitor(void) {
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diff changeset
258 subject_t *subject, *monitor;
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diff changeset
259 observer_t *observer[2];
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diff changeset
260 int cnt = 0;
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diff changeset
261
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diff changeset
262 subject = subject_new(&test_factory, NULL, 0);
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diff changeset
263 monitor = subject_new(&test_factory, NULL, 0);
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diff changeset
264 subject_set_monitor(subject, monitor);
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diff changeset
265
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diff changeset
266 observer[0] = subject_add_observer(monitor, monitor_handler, &cnt);
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diff changeset
267 observer[1] = subject_add_observer(subject, NULL, NULL);
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diff changeset
268 CU_ASSERT(cnt == 1);
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diff changeset
269
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diff changeset
270 subject_remove_observer(subject, observer[1]);
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diff changeset
271 CU_ASSERT(cnt == 2);
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diff changeset
272
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273 subject_free(subject);
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274 CU_ASSERT(cnt == 3);
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275
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276 subject_remove_observer(monitor, observer[0]);
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277 subject_free(monitor);
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278 }
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279
73
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parents:
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280 CU_pSuite get_observer_suite(void) {
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281 CU_pSuite suite;
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282
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283 suite = CU_add_suite("Suite_observer", NULL, NULL);
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284 CU_ADD_TEST(suite, test_observer);
224
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285 CU_ADD_TEST(suite, test_monitor);
73
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286
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287 return suite;
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288 }
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289
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290 #endif /* UNITTEST */