Mercurial > MadButterfly
annotate include/mb_observer.h @ 201:31933f9ee70e
Chkec in demo for dynamic rectangle creation and button.
| author | wycc@wycc-desktop |
|---|---|
| date | Sun, 07 Dec 2008 18:00:06 +0800 |
| parents | f9d507a3e1d9 |
| children | 748896358da2 |
| rev | line source |
|---|---|
| 73 | 1 #ifndef __OBSERVER_H_ |
| 2 #define __OBSERVER_H_ | |
| 3 | |
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4 #include "mb_tools.h" |
| 73 | 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 { | |
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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 { |
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23 int type; |
| 73 | 24 evt_handler hdr; |
| 25 void *arg; | |
| 26 observer_t *next; | |
| 27 }; | |
| 28 | |
| 78 | 29 /*! \brief Subject of observer pattern. |
| 30 * | |
| 31 * Observer is a pattern to decouple caller and callee, | |
| 32 * especial for multiple callee. | |
| 33 * \see http://en.wikipedia.org/wiki/Observer_pattern | |
| 34 */ | |
| 73 | 35 struct _subject { |
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36 int obj_type; /*!< \brief type of object (a.k.a. OBJT_*). */ |
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37 void *obj; /*!< \brief the object this subject for. */ |
| 73 | 38 int flags; |
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39 ob_factory_t *factory; |
| 73 | 40 STAILQ(observer_t) observers; |
| 41 }; | |
| 78 | 42 /*! \brief Flag that make a subject to propagate events to parents. */ |
| 73 | 43 #define SUBF_STOP_PROPAGATE 0x1 |
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44 #define SUBF_BUSY 0x2 /*!< \brief in subject_notify() */ |
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45 #define SUBF_FREE 0x4 /*!< \brief in postponding subject_free() */ |
| 73 | 46 |
| 154 | 47 enum {OBJT_GEO, OBJT_COORD, OBJT_KB, OBJT_PROGM, OBJT_RDMAN}; |
| 73 | 48 |
| 49 struct _mouse_event { | |
| 50 event_t event; | |
| 51 int x, y; | |
| 78 | 52 unsigned int but_state; |
| 53 unsigned int button; | |
| 73 | 54 }; |
| 55 | |
| 76 | 56 #define MOUSE_BUT1 0x1 |
| 57 #define MOUSE_BUT2 0x2 | |
| 58 #define MOUSE_BUT3 0x4 | |
| 59 | |
| 73 | 60 /*! \brief Observer factory. |
| 61 * | |
| 62 * It provides functions for allocation of subject and observer objects, | |
| 63 * and strategy function for getting the subject of parent coord object. | |
| 64 */ | |
| 65 struct _ob_factory { | |
| 66 subject_t *(*subject_alloc)(ob_factory_t *factory); | |
| 67 void (*subject_free)(ob_factory_t *factory, subject_t *subject); | |
| 68 observer_t *(*observer_alloc)(ob_factory_t *factory); | |
| 69 void (*observer_free)(ob_factory_t *factory, observer_t *observer); | |
| 70 /*! This is a strategy function to get subjects of parents. */ | |
| 71 subject_t *(*get_parent_subject)(ob_factory_t *factory, | |
| 72 subject_t *cur_subject); | |
| 73 }; | |
| 74 | |
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75 enum {EVT_ANY,EVT_MOUSE_OVER, EVT_MOUSE_OUT, EVT_MOUSE_MOVE, |
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76 EVT_MOUSE_BUT_PRESS, EVT_MOUSE_BUT_RELEASE, |
| 154 | 77 EVT_KB_PRESS, EVT_KB_RELEASE, EVT_PROGM_COMPLETE, |
| 78 EVT_RDMAN_REDRAW }; | |
| 73 | 79 |
| 80 extern subject_t *subject_new(ob_factory_t *factory, | |
| 81 void *obj, int obj_type); | |
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82 extern void subject_free(subject_t *subject); |
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83 extern void subject_notify(subject_t *subject, event_t *evt); |
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84 extern observer_t *subject_add_observer(subject_t *subject, |
| 73 | 85 evt_handler hdr, void *arg); |
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86 extern void subject_remove_observer(subject_t *subject, |
| 73 | 87 observer_t *observer); |
| 88 | |
| 89 | |
| 90 #endif /* __OBSERVER_H_ */ |