Mercurial > MadButterfly
annotate src/observer.c @ 441:94477e7d981e
Fix compile error: no return statement
author | john.cylee@gmail.com |
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date | Thu, 30 Jul 2009 12:21:34 +0800 |
parents | 29e1b2bffe4c |
children | 586e50f82c1f |
rev | line source |
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73 | 1 #include <stdio.h> |
186
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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" |
73 | 5 |
126 | 6 #ifndef ASSERT |
7 #define ASSERT(x) | |
8 #endif | |
9 | |
73 | 10 subject_t *subject_new(ob_factory_t *factory, void *obj, int obj_type) { |
11 subject_t *subject; | |
12 | |
13 subject = factory->subject_alloc(factory); | |
14 if(subject == NULL) | |
15 return NULL; | |
16 | |
17 subject->obj = obj; | |
18 subject->obj_type = obj_type; | |
19 subject->flags = 0; | |
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20 subject->monitor_sub = NULL; |
73 | 21 STAILQ_INIT(subject->observers); |
22 | |
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23 subject->factory = factory; |
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24 |
73 | 25 return subject; |
26 } | |
27 | |
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28 /*! |
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29 * \todo Keep ob_factory following subject objects. |
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30 */ |
192
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31 void subject_free(subject_t *subject) { |
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32 ob_factory_t *factory = subject->factory; |
73 | 33 observer_t *observer; |
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34 monitor_event_t mevt; |
73 | 35 |
126 | 36 ASSERT(!(subject->flags & SUBF_FREE)); |
125
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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 |
73 | 52 while((observer = STAILQ_HEAD(subject->observers))) { |
53 STAILQ_REMOVE(subject->observers, observer_t, next, observer); | |
54 factory->observer_free(factory, observer); | |
55 } | |
56 factory->subject_free(factory, subject); | |
57 } | |
58 | |
59 | |
192
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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; |
73 | 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; |
73 | 66 |
77 | 67 evt->tgt = subject; |
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68 evt->flags = 0; |
73 | 69 while(subject) { |
127
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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; |
127
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76 subject->flags |= SUBF_BUSY; |
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77 |
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78 evt->cur_tgt = subject; |
73 | 79 for(observer = STAILQ_HEAD(subject->observers); |
80 observer != NULL; | |
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 } |
73 | 92 } |
93 | |
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94 if(!old_busy) |
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95 subject->flags &= ~SUBF_BUSY; |
194
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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); |
127
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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) |
73 | 107 break; |
108 } | |
109 } | |
110 | |
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111 /*! \brief Add an observer for specified type of events. |
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112 */ |
198
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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; |
73 | 125 |
126 STAILQ_INS_TAIL(subject->observers, observer_t, next, observer); | |
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 | 162 return observer; |
163 } | |
164 | |
192
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165 void subject_remove_observer(subject_t *subject, |
73 | 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 |
73 | 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 | 179 factory->observer_free(factory, observer); |
180 } | |
181 | |
182 #ifdef UNITTEST | |
183 | |
184 #include <CUnit/Basic.h> | |
185 #include <stdlib.h> | |
186 | |
187 static subject_t *test_subject_alloc(ob_factory_t *factory) { | |
188 subject_t *subject; | |
189 | |
190 subject = (subject_t *)malloc(sizeof(subject_t)); | |
191 return subject; | |
192 } | |
193 | |
194 static void test_subject_free(ob_factory_t *factory, subject_t *subject) { | |
195 free(subject); | |
196 } | |
197 | |
198 static observer_t *test_observer_alloc(ob_factory_t *factory) { | |
199 observer_t *observer; | |
200 | |
201 observer = (observer_t *)malloc(sizeof(observer_t)); | |
202 return observer; | |
203 } | |
204 | |
205 static void test_observer_free(ob_factory_t *factory, observer_t *observer) { | |
206 free(observer); | |
207 } | |
208 | |
209 static subject_t *test_get_parent_subject(ob_factory_t *factory, | |
210 subject_t *subject) { | |
211 return NULL; | |
212 } | |
213 | |
214 static ob_factory_t test_factory = { | |
215 test_subject_alloc, | |
216 test_subject_free, | |
217 test_observer_alloc, | |
218 test_observer_free, | |
219 test_get_parent_subject | |
220 }; | |
221 | |
222 static void handler(event_t *evt, void *arg) { | |
223 int *cnt = (int *)arg; | |
224 | |
74 | 225 CU_ASSERT(evt->type == EVT_MOUSE_OUT); |
73 | 226 (*cnt)++; |
227 } | |
228 | |
224
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229 static void test_observer(void) { |
73 | 230 subject_t *subject; |
74 | 231 observer_t *observer[2]; |
73 | 232 event_t evt; |
233 int cnt = 0; | |
234 | |
235 subject = subject_new(&test_factory, NULL, 0); | |
236 subject->flags |= SUBF_STOP_PROPAGATE; | |
192
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237 observer[0] = subject_add_observer(subject, handler, &cnt); |
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238 observer[1] = subject_add_observer(subject, handler, &cnt); |
73 | 239 |
74 | 240 evt.type = EVT_MOUSE_OUT; |
73 | 241 evt.tgt = NULL; |
242 evt.cur_tgt = NULL; | |
192
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243 subject_notify(subject, &evt); |
74 | 244 CU_ASSERT(cnt == 2); |
73 | 245 |
192
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246 subject_remove_observer(subject, observer[0]); |
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247 subject_remove_observer(subject, observer[1]); |
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248 subject_free(subject); |
73 | 249 } |
250 | |
224
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251 static void monitor_handler(event_t *evt, void *arg) { |
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252 int *cnt = (int *)arg; |
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253 |
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254 (*cnt)++; |
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255 } |
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256 |
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257 static void test_monitor(void) { |
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258 subject_t *subject, *monitor; |
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259 observer_t *observer[2]; |
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260 int cnt = 0; |
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261 |
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262 subject = subject_new(&test_factory, NULL, 0); |
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263 monitor = subject_new(&test_factory, NULL, 0); |
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264 subject_set_monitor(subject, monitor); |
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265 |
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266 observer[0] = subject_add_observer(monitor, monitor_handler, &cnt); |
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267 observer[1] = subject_add_observer(subject, NULL, NULL); |
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268 CU_ASSERT(cnt == 1); |
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269 |
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270 subject_remove_observer(subject, observer[1]); |
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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 | 280 CU_pSuite get_observer_suite(void) { |
281 CU_pSuite suite; | |
282 | |
283 suite = CU_add_suite("Suite_observer", NULL, NULL); | |
284 CU_ADD_TEST(suite, test_observer); | |
224
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285 CU_ADD_TEST(suite, test_monitor); |
73 | 286 |
287 return suite; | |
288 } | |
289 | |
290 #endif /* UNITTEST */ |