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annotate src/observer.c @ 206:748896358da2

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Export subject_add_event_observer() to rest of the system. - declare it in mb_observer.h
author Thinker K.F. Li <thinker@branda.to>
date Wed, 10 Dec 2008 12:02:17 +0800
parents 75ec0124202a
children 29e1b2bffe4c
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 STAILQ_INIT(subject->observers);
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21
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22 subject->factory = factory;
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23
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24 return subject;
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25 }
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26
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27 /*!
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28 * \todo Keep ob_factory following subject objects.
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29 */
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30 void subject_free(subject_t *subject) {
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31 ob_factory_t *factory = subject->factory;
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32 observer_t *observer;
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33
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34 ASSERT(!(subject->flags & SUBF_FREE));
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35 if(subject->flags & SUBF_BUSY) {
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36 /* Postpond the request until busy status been stoped.
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37 * SUBF_BUSY means in subject_notify().
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38 */
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39 subject->flags |= SUBF_FREE;
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40 return;
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41 }
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42
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43 while((observer = STAILQ_HEAD(subject->observers))) {
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44 STAILQ_REMOVE(subject->observers, observer_t, next, observer);
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45 factory->observer_free(factory, observer);
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46 }
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47 factory->subject_free(factory, subject);
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48 }
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49
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50
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51 void subject_notify(subject_t *subject, event_t *evt) {
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52 ob_factory_t *factory = subject->factory;
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53 observer_t *observer;
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54 subject_t *old_subject;
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55
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56 evt->tgt = subject;
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57 while(subject) {
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58 /*!
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59 * \note What is happend when the subject is freed by observer?
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60 * Postponding the request of free until notification
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61 * been finished. (\ref SUBF_BUSY / \ref SUBF_FREE)
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62 */
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63 subject->flags |= SUBF_BUSY;
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64
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65 evt->cur_tgt = subject->obj;
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66 for(observer = STAILQ_HEAD(subject->observers);
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67 observer != NULL;
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68 observer = STAILQ_NEXT(observer_t, next, observer)) {
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69 if (observer->type == EVT_ANY || observer->type == evt->type)
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70 observer->hdr(evt, observer->arg);
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71 }
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72
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73 subject->flags &= ~SUBF_BUSY;
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75 old_subject = subject;
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76 subject = factory->get_parent_subject(factory, subject);
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78 if(old_subject->flags & SUBF_FREE)
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79 subject_free(old_subject);
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80
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81 if(old_subject->flags & SUBF_STOP_PROPAGATE)
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82 break;
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83 }
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84 }
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85
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86 /*! \brief Add an observer for any type of events.
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87 */
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88 observer_t *subject_add_observer(subject_t *subject,
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89 evt_handler hdr, void *arg) {
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90 ob_factory_t *factory = subject->factory;
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91 observer_t *observer;
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92
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93 observer = factory->observer_alloc(factory);
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94 if(observer == NULL)
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95 return NULL;
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96 observer->hdr = hdr;
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97 observer->arg = arg;
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98 observer->type = EVT_ANY;
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99
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100 STAILQ_INS_TAIL(subject->observers, observer_t, next, observer);
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101
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102 return observer;
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103 }
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104
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105 /*! \brief Add an observer for specified type of events.
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106 */
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107 observer_t *subject_add_event_observer(subject_t *subject, int type,
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108 evt_handler hdr, void *arg) {
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109 ob_factory_t *factory = subject->factory;
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110 observer_t *observer;
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111
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112 observer = factory->observer_alloc(factory);
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113 if(observer == NULL)
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114 return NULL;
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115 observer->hdr = hdr;
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116 observer->arg = arg;
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117 observer->type = type;
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118
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119 STAILQ_INS_TAIL(subject->observers, observer_t, next, observer);
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120
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121 return observer;
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122 }
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123
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124 void subject_remove_observer(subject_t *subject,
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125 observer_t *observer) {
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126 ob_factory_t *factory = subject->factory;
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127
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128 STAILQ_REMOVE(subject->observers, observer_t, next, observer);
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129 factory->observer_free(factory, observer);
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130 }
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131
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132 #ifdef UNITTEST
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133
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134 #include <CUnit/Basic.h>
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135 #include <stdlib.h>
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136
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137 static subject_t *test_subject_alloc(ob_factory_t *factory) {
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138 subject_t *subject;
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139
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140 subject = (subject_t *)malloc(sizeof(subject_t));
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141 return subject;
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142 }
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143
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144 static void test_subject_free(ob_factory_t *factory, subject_t *subject) {
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145 free(subject);
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146 }
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147
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148 static observer_t *test_observer_alloc(ob_factory_t *factory) {
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149 observer_t *observer;
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150
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151 observer = (observer_t *)malloc(sizeof(observer_t));
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152 return observer;
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153 }
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154
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155 static void test_observer_free(ob_factory_t *factory, observer_t *observer) {
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156 free(observer);
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157 }
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158
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159 static subject_t *test_get_parent_subject(ob_factory_t *factory,
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160 subject_t *subject) {
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161 return NULL;
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162 }
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163
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164 static ob_factory_t test_factory = {
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165 test_subject_alloc,
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166 test_subject_free,
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167 test_observer_alloc,
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168 test_observer_free,
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169 test_get_parent_subject
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170 };
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171
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172 static void handler(event_t *evt, void *arg) {
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173 int *cnt = (int *)arg;
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174
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175 CU_ASSERT(evt->type == EVT_MOUSE_OUT);
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176 (*cnt)++;
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177 }
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178
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179 void test_observer(void) {
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180 subject_t *subject;
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181 observer_t *observer[2];
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182 event_t evt;
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183 int cnt = 0;
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184
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185 subject = subject_new(&test_factory, NULL, 0);
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186 subject->flags |= SUBF_STOP_PROPAGATE;
192
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187 observer[0] = subject_add_observer(subject, handler, &cnt);
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188 observer[1] = subject_add_observer(subject, handler, &cnt);
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189
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190 evt.type = EVT_MOUSE_OUT;
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191 evt.tgt = NULL;
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192 evt.cur_tgt = NULL;
192
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193 subject_notify(subject, &evt);
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194 CU_ASSERT(cnt == 2);
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195
192
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196 subject_remove_observer(subject, observer[0]);
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197 subject_remove_observer(subject, observer[1]);
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198 subject_free(subject);
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199 }
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200
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201 CU_pSuite get_observer_suite(void) {
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202 CU_pSuite suite;
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203
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204 suite = CU_add_suite("Suite_observer", NULL, NULL);
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205 CU_ADD_TEST(suite, test_observer);
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206
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207 return suite;
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208 }
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209
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210 #endif /* UNITTEST */