Mercurial > MadButterfly
annotate src/observer.h @ 123:9e2316dc6ecb
Program completion events
| author | Thinker K.F. Li <thinker@branda.to> |
|---|---|
| date | Tue, 16 Sep 2008 14:19:26 +0800 |
| parents | 17e97e92b76e |
| children | 1c1f28c124c9 |
| rev | line source |
|---|---|
| 73 | 1 #ifndef __OBSERVER_H_ |
| 2 #define __OBSERVER_H_ | |
| 3 | |
| 4 #include "tools.h" | |
| 5 | |
| 6 typedef struct _event event_t; | |
| 7 typedef struct _observer observer_t; | |
| 8 typedef struct _subject subject_t; | |
| 9 typedef struct _mouse_event mouse_event_t; | |
| 10 typedef struct _ob_factory ob_factory_t; | |
| 11 typedef void (*evt_handler)(event_t *event, void *arg); | |
| 12 | |
| 13 struct _event { | |
|
122
17e97e92b76e
Encapsulate X_MB_runtime_t and support X keyboard events.
Thinker K.F. Li <thinker@branda.to>
parents:
78
diff
changeset
|
14 int type; /*!< event type (a.k.a. EVT_* */ |
| 73 | 15 subject_t *tgt, *cur_tgt; |
| 16 }; | |
| 17 | |
| 78 | 18 /*! \brief Observer of observer pattern. |
| 19 * | |
| 20 * A target for receiving events. | |
| 21 */ | |
| 73 | 22 struct _observer { |
| 23 evt_handler hdr; | |
| 24 void *arg; | |
| 25 observer_t *next; | |
| 26 }; | |
| 27 | |
| 78 | 28 /*! \brief Subject of observer pattern. |
| 29 * | |
| 30 * Observer is a pattern to decouple caller and callee, | |
| 31 * especial for multiple callee. | |
| 32 * \see http://en.wikipedia.org/wiki/Observer_pattern | |
| 33 */ | |
| 73 | 34 struct _subject { |
| 78 | 35 int obj_type; /*!< type of object (a.k.a. OBJT_*). */ |
| 36 void *obj; /*!< the object this subject for. */ | |
| 73 | 37 int flags; |
| 38 STAILQ(observer_t) observers; | |
| 39 }; | |
| 78 | 40 /*! \brief Flag that make a subject to propagate events to parents. */ |
| 73 | 41 #define SUBF_STOP_PROPAGATE 0x1 |
| 42 | |
|
123
9e2316dc6ecb
Program completion events
Thinker K.F. Li <thinker@branda.to>
parents:
122
diff
changeset
|
43 enum {OBJT_GEO, OBJT_COORD, OBJT_KB, OBJT_PROGM}; |
| 73 | 44 |
| 45 struct _mouse_event { | |
| 46 event_t event; | |
| 47 int x, y; | |
| 78 | 48 unsigned int but_state; |
| 49 unsigned int button; | |
| 73 | 50 }; |
| 51 | |
| 76 | 52 #define MOUSE_BUT1 0x1 |
| 53 #define MOUSE_BUT2 0x2 | |
| 54 #define MOUSE_BUT3 0x4 | |
| 55 | |
| 73 | 56 /*! \brief Observer factory. |
| 57 * | |
| 58 * It provides functions for allocation of subject and observer objects, | |
| 59 * and strategy function for getting the subject of parent coord object. | |
| 60 */ | |
| 61 struct _ob_factory { | |
| 62 subject_t *(*subject_alloc)(ob_factory_t *factory); | |
| 63 void (*subject_free)(ob_factory_t *factory, subject_t *subject); | |
| 64 observer_t *(*observer_alloc)(ob_factory_t *factory); | |
| 65 void (*observer_free)(ob_factory_t *factory, observer_t *observer); | |
| 66 /*! This is a strategy function to get subjects of parents. */ | |
| 67 subject_t *(*get_parent_subject)(ob_factory_t *factory, | |
| 68 subject_t *cur_subject); | |
| 69 }; | |
| 70 | |
| 71 enum {EVT_MOUSE_OVER, EVT_MOUSE_OUT, EVT_MOUSE_MOVE, | |
|
122
17e97e92b76e
Encapsulate X_MB_runtime_t and support X keyboard events.
Thinker K.F. Li <thinker@branda.to>
parents:
78
diff
changeset
|
72 EVT_MOUSE_BUT_PRESS, EVT_MOUSE_BUT_RELEASE, |
|
123
9e2316dc6ecb
Program completion events
Thinker K.F. Li <thinker@branda.to>
parents:
122
diff
changeset
|
73 EVT_KB_PRESS, EVT_KB_RELEASE, EVT_PROGM_COMPLETE}; |
| 73 | 74 |
| 75 extern subject_t *subject_new(ob_factory_t *factory, | |
| 76 void *obj, int obj_type); | |
| 77 extern void subject_free(ob_factory_t *factory, subject_t *subject); | |
| 78 extern void subject_notify(ob_factory_t *factory, | |
| 79 subject_t *subject, event_t *evt); | |
| 80 extern observer_t *subject_add_observer(ob_factory_t *factory, | |
| 81 subject_t *subject, | |
| 82 evt_handler hdr, void *arg); | |
| 83 extern void subject_remove_observer(ob_factory_t *factory, | |
| 84 subject_t *subject, | |
| 85 observer_t *observer); | |
| 86 | |
| 87 | |
| 88 #endif /* __OBSERVER_H_ */ |