Mercurial > MadButterfly

annotate src/observer.c @ 335:01038b8d8f05

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Set the progm to be NULL so that we won't call mb_progm_abort when we call it at the next time. This will fix the crash issue of the dynamic. However, the dynamic is still crash sometimes if we click the button quickly. It looks like it crashes in the refresh. We need to future figure out the issue.
author wycc
date Sat, 07 Mar 2009 14:24:55 +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;
198
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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
224
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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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diff changeset
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
3e3e074120a7 test case for observer
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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
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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
54fdc2a65242 Remove factory from observer APIs.
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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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diff changeset
253
29e1b2bffe4c X backend only sent EVT_MOUSE_MOVE_RAW to MadButterfly.
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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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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 */