Mercurial > MadButterfly
annotate include/mb_observer.h @ 192:54fdc2a65242
Remove factory from observer APIs.
- Save factory that used to new a subject as subject's attribute.
- Get factory from subject himself instead of passing as an argument.
- It make API of observer more simple and clean.
| author | Thinker K.F. Li <thinker@branda.to> |
|---|---|
| date | Tue, 18 Nov 2008 21:42:30 +0800 |
| parents | 530bb7728546 |
| children | f9d507a3e1d9 |
| rev | line source |
|---|---|
| 73 | 1 #ifndef __OBSERVER_H_ |
| 2 #define __OBSERVER_H_ | |
| 3 | |
|
186
530bb7728546
Move header files to $(top_srcdir)/include/ and prefixed with 'mb_'.
Thinker K.F. Li <thinker@branda.to>
parents:
185
diff
changeset
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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 { | |
|
122
17e97e92b76e
Encapsulate X_MB_runtime_t and support X keyboard events.
Thinker K.F. Li <thinker@branda.to>
parents:
78
diff
changeset
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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 { |
| 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 { |
|
125
1c1f28c124c9
Postponding free request when a subject is in subject_notify
Thinker K.F. Li <thinker@branda.to>
parents:
123
diff
changeset
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35 int obj_type; /*!< \brief type of object (a.k.a. OBJT_*). */ |
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1c1f28c124c9
Postponding free request when a subject is in subject_notify
Thinker K.F. Li <thinker@branda.to>
parents:
123
diff
changeset
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36 void *obj; /*!< \brief the object this subject for. */ |
| 73 | 37 int flags; |
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192
54fdc2a65242
Remove factory from observer APIs.
Thinker K.F. Li <thinker@branda.to>
parents:
186
diff
changeset
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38 ob_factory_t *factory; |
| 73 | 39 STAILQ(observer_t) observers; |
| 40 }; | |
| 78 | 41 /*! \brief Flag that make a subject to propagate events to parents. */ |
| 73 | 42 #define SUBF_STOP_PROPAGATE 0x1 |
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125
1c1f28c124c9
Postponding free request when a subject is in subject_notify
Thinker K.F. Li <thinker@branda.to>
parents:
123
diff
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43 #define SUBF_BUSY 0x2 /*!< \brief in subject_notify() */ |
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1c1f28c124c9
Postponding free request when a subject is in subject_notify
Thinker K.F. Li <thinker@branda.to>
parents:
123
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44 #define SUBF_FREE 0x4 /*!< \brief in postponding subject_free() */ |
| 73 | 45 |
| 154 | 46 enum {OBJT_GEO, OBJT_COORD, OBJT_KB, OBJT_PROGM, OBJT_RDMAN}; |
| 73 | 47 |
| 48 struct _mouse_event { | |
| 49 event_t event; | |
| 50 int x, y; | |
| 78 | 51 unsigned int but_state; |
| 52 unsigned int button; | |
| 73 | 53 }; |
| 54 | |
| 76 | 55 #define MOUSE_BUT1 0x1 |
| 56 #define MOUSE_BUT2 0x2 | |
| 57 #define MOUSE_BUT3 0x4 | |
| 58 | |
| 73 | 59 /*! \brief Observer factory. |
| 60 * | |
| 61 * It provides functions for allocation of subject and observer objects, | |
| 62 * and strategy function for getting the subject of parent coord object. | |
| 63 */ | |
| 64 struct _ob_factory { | |
| 65 subject_t *(*subject_alloc)(ob_factory_t *factory); | |
| 66 void (*subject_free)(ob_factory_t *factory, subject_t *subject); | |
| 67 observer_t *(*observer_alloc)(ob_factory_t *factory); | |
| 68 void (*observer_free)(ob_factory_t *factory, observer_t *observer); | |
| 69 /*! This is a strategy function to get subjects of parents. */ | |
| 70 subject_t *(*get_parent_subject)(ob_factory_t *factory, | |
| 71 subject_t *cur_subject); | |
| 72 }; | |
| 73 | |
| 74 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
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75 EVT_MOUSE_BUT_PRESS, EVT_MOUSE_BUT_RELEASE, |
| 154 | 76 EVT_KB_PRESS, EVT_KB_RELEASE, EVT_PROGM_COMPLETE, |
| 77 EVT_RDMAN_REDRAW }; | |
| 73 | 78 |
| 79 extern subject_t *subject_new(ob_factory_t *factory, | |
| 80 void *obj, int obj_type); | |
|
192
54fdc2a65242
Remove factory from observer APIs.
Thinker K.F. Li <thinker@branda.to>
parents:
186
diff
changeset
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81 extern void subject_free(subject_t *subject); |
|
54fdc2a65242
Remove factory from observer APIs.
Thinker K.F. Li <thinker@branda.to>
parents:
186
diff
changeset
|
82 extern void subject_notify(subject_t *subject, event_t *evt); |
|
54fdc2a65242
Remove factory from observer APIs.
Thinker K.F. Li <thinker@branda.to>
parents:
186
diff
changeset
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83 extern observer_t *subject_add_observer(subject_t *subject, |
| 73 | 84 evt_handler hdr, void *arg); |
|
192
54fdc2a65242
Remove factory from observer APIs.
Thinker K.F. Li <thinker@branda.to>
parents:
186
diff
changeset
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85 extern void subject_remove_observer(subject_t *subject, |
| 73 | 86 observer_t *observer); |
| 87 | |
| 88 | |
| 89 #endif /* __OBSERVER_H_ */ |