Mercurial > MadButterfly
annotate src/observer.c @ 176:04c81b8a5d23
Change documentation for installation
| author | Thinker K.F. Li <thinker@branda.to> |
|---|---|
| date | Fri, 31 Oct 2008 15:24:31 +0800 |
| parents | d2cc7400c971 |
| children | c7e5b8779bb5 |
| rev | line source |
|---|---|
| 73 | 1 #include <stdio.h> |
| 2 #include "redraw_man.h" | |
| 3 #include "observer.h" | |
| 4 #include "tools.h" | |
| 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 | |
| 22 return subject; | |
| 23 } | |
| 24 | |
|
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25 /*! |
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26 * \todo Keep ob_factory following subject objects. |
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27 */ |
| 73 | 28 void subject_free(ob_factory_t *factory, subject_t *subject) { |
| 29 observer_t *observer; | |
| 30 | |
| 126 | 31 ASSERT(!(subject->flags & SUBF_FREE)); |
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32 if(subject->flags & SUBF_BUSY) { |
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33 /* Postpond the request until busy status been stoped. |
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34 * SUBF_BUSY means in subject_notify(). |
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35 */ |
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36 subject->flags |= SUBF_FREE; |
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37 return; |
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38 } |
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39 |
| 73 | 40 while((observer = STAILQ_HEAD(subject->observers))) { |
| 41 STAILQ_REMOVE(subject->observers, observer_t, next, observer); | |
| 42 factory->observer_free(factory, observer); | |
| 43 } | |
| 44 factory->subject_free(factory, subject); | |
| 45 } | |
| 46 | |
| 47 | |
| 48 void subject_notify(ob_factory_t *factory, subject_t *subject, event_t *evt) { | |
| 49 observer_t *observer; | |
| 50 | |
| 77 | 51 evt->tgt = subject; |
| 73 | 52 while(subject) { |
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53 /*! |
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54 * \note What is happend when the subject is freed by observer? |
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55 * Postponding the request of free until notification |
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56 * been finished. (\ref SUBF_BUSY / \ref SUBF_FREE) |
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57 */ |
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58 subject->flags |= SUBF_BUSY; |
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59 |
| 77 | 60 evt->cur_tgt = subject->obj; |
| 73 | 61 for(observer = STAILQ_HEAD(subject->observers); |
| 62 observer != NULL; | |
| 63 observer = STAILQ_NEXT(observer_t, next, observer)) { | |
| 64 observer->hdr(evt, observer->arg); | |
| 65 } | |
| 66 | |
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67 subject->flags &= ~SUBF_BUSY; |
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68 if(subject->flags & SUBF_FREE) |
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69 subject_free(factory, subject); |
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70 |
| 73 | 71 if(subject->flags & SUBF_STOP_PROPAGATE) |
| 72 break; | |
| 73 | |
| 74 subject = factory->get_parent_subject(factory, subject); | |
| 75 } | |
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76 |
| 73 | 77 } |
| 78 | |
| 79 observer_t *subject_add_observer(ob_factory_t *factory, | |
| 80 subject_t *subject, | |
| 81 evt_handler hdr, void *arg) { | |
| 82 observer_t *observer; | |
| 83 | |
| 84 observer = factory->observer_alloc(factory); | |
| 85 if(observer == NULL) | |
| 86 return NULL; | |
| 87 observer->hdr = hdr; | |
| 88 observer->arg = arg; | |
| 89 | |
| 90 STAILQ_INS_TAIL(subject->observers, observer_t, next, observer); | |
| 91 | |
| 92 return observer; | |
| 93 } | |
| 94 | |
| 95 void subject_remove_observer(ob_factory_t *factory, | |
| 96 subject_t *subject, | |
| 97 observer_t *observer) { | |
| 98 STAILQ_REMOVE(subject->observers, observer_t, next, observer); | |
| 99 factory->observer_free(factory, observer); | |
| 100 } | |
| 101 | |
| 102 #ifdef UNITTEST | |
| 103 | |
| 104 #include <CUnit/Basic.h> | |
| 105 #include <stdlib.h> | |
| 106 | |
| 107 static subject_t *test_subject_alloc(ob_factory_t *factory) { | |
| 108 subject_t *subject; | |
| 109 | |
| 110 subject = (subject_t *)malloc(sizeof(subject_t)); | |
| 111 return subject; | |
| 112 } | |
| 113 | |
| 114 static void test_subject_free(ob_factory_t *factory, subject_t *subject) { | |
| 115 free(subject); | |
| 116 } | |
| 117 | |
| 118 static observer_t *test_observer_alloc(ob_factory_t *factory) { | |
| 119 observer_t *observer; | |
| 120 | |
| 121 observer = (observer_t *)malloc(sizeof(observer_t)); | |
| 122 return observer; | |
| 123 } | |
| 124 | |
| 125 static void test_observer_free(ob_factory_t *factory, observer_t *observer) { | |
| 126 free(observer); | |
| 127 } | |
| 128 | |
| 129 static subject_t *test_get_parent_subject(ob_factory_t *factory, | |
| 130 subject_t *subject) { | |
| 131 return NULL; | |
| 132 } | |
| 133 | |
| 134 static ob_factory_t test_factory = { | |
| 135 test_subject_alloc, | |
| 136 test_subject_free, | |
| 137 test_observer_alloc, | |
| 138 test_observer_free, | |
| 139 test_get_parent_subject | |
| 140 }; | |
| 141 | |
| 142 static void handler(event_t *evt, void *arg) { | |
| 143 int *cnt = (int *)arg; | |
| 144 | |
| 74 | 145 CU_ASSERT(evt->type == EVT_MOUSE_OUT); |
| 73 | 146 (*cnt)++; |
| 147 } | |
| 148 | |
| 149 void test_observer(void) { | |
| 150 subject_t *subject; | |
| 74 | 151 observer_t *observer[2]; |
| 73 | 152 event_t evt; |
| 153 int cnt = 0; | |
| 154 | |
| 155 subject = subject_new(&test_factory, NULL, 0); | |
| 156 subject->flags |= SUBF_STOP_PROPAGATE; | |
| 74 | 157 observer[0] = subject_add_observer(&test_factory, subject, |
| 158 handler, &cnt); | |
| 159 observer[1] = subject_add_observer(&test_factory, subject, | |
| 160 handler, &cnt); | |
| 73 | 161 |
| 74 | 162 evt.type = EVT_MOUSE_OUT; |
| 73 | 163 evt.tgt = NULL; |
| 164 evt.cur_tgt = NULL; | |
| 165 subject_notify(&test_factory, subject, &evt); | |
| 74 | 166 CU_ASSERT(cnt == 2); |
| 73 | 167 |
| 74 | 168 subject_remove_observer(&test_factory, subject, observer[0]); |
| 169 subject_remove_observer(&test_factory, subject, observer[1]); | |
| 73 | 170 subject_free(&test_factory, subject); |
| 171 } | |
| 172 | |
| 173 CU_pSuite get_observer_suite(void) { | |
| 174 CU_pSuite suite; | |
| 175 | |
| 176 suite = CU_add_suite("Suite_observer", NULL, NULL); | |
| 177 CU_ADD_TEST(suite, test_observer); | |
| 178 | |
| 179 return suite; | |
| 180 } | |
| 181 | |
| 182 #endif /* UNITTEST */ |