Mercurial > MadButterfly
annotate src/observer.c @ 202:75ec0124202a
Commit merged between 200 and 201
| author | wycc@wycc-desktop |
|---|---|
| date | Tue, 09 Dec 2008 23:34:05 +0800 |
| parents | f9d507a3e1d9 45d9a1e2764d |
| children | 748896358da2 |
| rev | line source |
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| 73 | 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" |
| 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; | |
| 20 STAILQ_INIT(subject->observers); | |
| 21 | |
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22 subject->factory = factory; |
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23 |
| 73 | 24 return subject; |
| 25 } | |
| 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; |
| 73 | 32 observer_t *observer; |
| 33 | |
| 126 | 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 |
| 73 | 43 while((observer = STAILQ_HEAD(subject->observers))) { |
| 44 STAILQ_REMOVE(subject->observers, observer_t, next, observer); | |
| 45 factory->observer_free(factory, observer); | |
| 46 } | |
| 47 factory->subject_free(factory, subject); | |
| 48 } | |
| 49 | |
| 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; |
| 73 | 53 observer_t *observer; |
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54 subject_t *old_subject; |
| 73 | 55 |
| 77 | 56 evt->tgt = subject; |
| 73 | 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 |
| 77 | 65 evt->cur_tgt = subject->obj; |
| 73 | 66 for(observer = STAILQ_HEAD(subject->observers); |
| 67 observer != NULL; | |
| 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); |
| 73 | 71 } |
| 72 | |
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73 subject->flags &= ~SUBF_BUSY; |
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74 |
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75 old_subject = subject; |
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76 subject = factory->get_parent_subject(factory, subject); |
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77 |
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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) |
| 73 | 82 break; |
| 83 } | |
| 84 } | |
| 85 | |
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86 observer_t *subject_add_observer(subject_t *subject, |
| 73 | 87 evt_handler hdr, void *arg) { |
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88 ob_factory_t *factory = subject->factory; |
| 73 | 89 observer_t *observer; |
| 90 | |
| 91 observer = factory->observer_alloc(factory); | |
| 92 if(observer == NULL) | |
| 93 return NULL; | |
| 94 observer->hdr = hdr; | |
| 95 observer->arg = arg; | |
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96 observer->type = EVT_ANY; |
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97 |
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98 STAILQ_INS_TAIL(subject->observers, observer_t, next, observer); |
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99 |
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100 return observer; |
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101 } |
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102 |
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103 observer_t *subject_add_event_observer(subject_t *subject, int type, |
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104 evt_handler hdr, void *arg) { |
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105 ob_factory_t *factory = subject->factory; |
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106 observer_t *observer; |
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107 |
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108 observer = factory->observer_alloc(factory); |
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109 if(observer == NULL) |
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110 return NULL; |
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111 observer->hdr = hdr; |
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112 observer->arg = arg; |
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113 observer->type = type; |
| 73 | 114 |
| 115 STAILQ_INS_TAIL(subject->observers, observer_t, next, observer); | |
| 116 | |
| 117 return observer; | |
| 118 } | |
| 119 | |
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120 void subject_remove_observer(subject_t *subject, |
| 73 | 121 observer_t *observer) { |
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122 ob_factory_t *factory = subject->factory; |
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123 |
| 73 | 124 STAILQ_REMOVE(subject->observers, observer_t, next, observer); |
| 125 factory->observer_free(factory, observer); | |
| 126 } | |
| 127 | |
| 128 #ifdef UNITTEST | |
| 129 | |
| 130 #include <CUnit/Basic.h> | |
| 131 #include <stdlib.h> | |
| 132 | |
| 133 static subject_t *test_subject_alloc(ob_factory_t *factory) { | |
| 134 subject_t *subject; | |
| 135 | |
| 136 subject = (subject_t *)malloc(sizeof(subject_t)); | |
| 137 return subject; | |
| 138 } | |
| 139 | |
| 140 static void test_subject_free(ob_factory_t *factory, subject_t *subject) { | |
| 141 free(subject); | |
| 142 } | |
| 143 | |
| 144 static observer_t *test_observer_alloc(ob_factory_t *factory) { | |
| 145 observer_t *observer; | |
| 146 | |
| 147 observer = (observer_t *)malloc(sizeof(observer_t)); | |
| 148 return observer; | |
| 149 } | |
| 150 | |
| 151 static void test_observer_free(ob_factory_t *factory, observer_t *observer) { | |
| 152 free(observer); | |
| 153 } | |
| 154 | |
| 155 static subject_t *test_get_parent_subject(ob_factory_t *factory, | |
| 156 subject_t *subject) { | |
| 157 return NULL; | |
| 158 } | |
| 159 | |
| 160 static ob_factory_t test_factory = { | |
| 161 test_subject_alloc, | |
| 162 test_subject_free, | |
| 163 test_observer_alloc, | |
| 164 test_observer_free, | |
| 165 test_get_parent_subject | |
| 166 }; | |
| 167 | |
| 168 static void handler(event_t *evt, void *arg) { | |
| 169 int *cnt = (int *)arg; | |
| 170 | |
| 74 | 171 CU_ASSERT(evt->type == EVT_MOUSE_OUT); |
| 73 | 172 (*cnt)++; |
| 173 } | |
| 174 | |
| 175 void test_observer(void) { | |
| 176 subject_t *subject; | |
| 74 | 177 observer_t *observer[2]; |
| 73 | 178 event_t evt; |
| 179 int cnt = 0; | |
| 180 | |
| 181 subject = subject_new(&test_factory, NULL, 0); | |
| 182 subject->flags |= SUBF_STOP_PROPAGATE; | |
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183 observer[0] = subject_add_observer(subject, handler, &cnt); |
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184 observer[1] = subject_add_observer(subject, handler, &cnt); |
| 73 | 185 |
| 74 | 186 evt.type = EVT_MOUSE_OUT; |
| 73 | 187 evt.tgt = NULL; |
| 188 evt.cur_tgt = NULL; | |
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189 subject_notify(subject, &evt); |
| 74 | 190 CU_ASSERT(cnt == 2); |
| 73 | 191 |
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192 subject_remove_observer(subject, observer[0]); |
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193 subject_remove_observer(subject, observer[1]); |
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194 subject_free(subject); |
| 73 | 195 } |
| 196 | |
| 197 CU_pSuite get_observer_suite(void) { | |
| 198 CU_pSuite suite; | |
| 199 | |
| 200 suite = CU_add_suite("Suite_observer", NULL, NULL); | |
| 201 CU_ADD_TEST(suite, test_observer); | |
| 202 | |
| 203 return suite; | |
| 204 } | |
| 205 | |
| 206 #endif /* UNITTEST */ |