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annotate include/mb_observer.h @ 1493:b0e113605382

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author Thinker K.F. Li <thinker@codemud.net>
date Mon, 02 May 2011 23:26:32 +0800
parents 1993e5ae60aa
children
rev   line source
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1 // -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*-
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2 // vim: sw=4:ts=8:sts=4
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3 #ifndef __OBSERVER_H_
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4 #define __OBSERVER_H_
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5
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6 #include "mb_tools.h"
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7
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8 typedef struct _event event_t;
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9 typedef struct _observer observer_t;
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10 typedef struct _subject subject_t;
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11 typedef struct _mouse_event mouse_event_t;
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12 typedef struct _monitor_event monitor_event_t;
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13 typedef struct _observer_factory observer_factory_t;
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14 typedef void (*evt_handler)(event_t *event, void *arg);
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15
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16 struct _event {
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17 int type; /*!< event type (a.k.a. EVT_*) */
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18 subject_t *tgt, *cur_tgt;
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19 int flags;
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20 };
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21
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22 /*! \brief Observer mark event with EVTF_STOP_PROPAGATE flag
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23 * to stop propagation.
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24 */
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25 #define EVTF_STOP_PROPAGATE 0x1
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26 /*! \brief Observer mark event with EVTF_STOP_NOTIFY flag to stop
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27 * stop notification the event immediately.
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28 */
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29 #define EVTF_STOP_NOTIFY 0x2
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30
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31 /*! \brief Observer of observer pattern.
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32 *
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33 * A target for receiving events.
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34 */
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35 struct _observer {
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36 int type;
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37 evt_handler hdr;
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38 void *arg;
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39 observer_t *next;
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40 };
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41
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42 /*! \brief Subject of observer pattern.
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43 *
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44 * Observer is a pattern to decouple caller and callee,
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45 * especial for multiple callee.
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46 * \see http://en.wikipedia.org/wiki/Observer_pattern
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47 *
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48 * This implementation add a monitor facility to monitor adding/removing
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49 * observers from subjects. Monitor is another subject that monitor events
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50 * will be sent to if it is existed.
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51 */
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52 struct _subject {
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53 int obj_type; /*!< \brief type of object (a.k.a. OBJT_*). */
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54 void *obj; /*!< \brief the object this subject for. */
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55 int flags;
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56 subject_t *monitor_sub; /*!< \brief Monitor adding/removing
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57 * obervers on this subject. */
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58 observer_factory_t *factory;
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59 STAILQ(observer_t) observers;
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60 };
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61 /*! \brief Flag that make a subject to stop propagate events to parents. */
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62 #define SUBF_STOP_PROPAGATE 0x1
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63 #define SUBF_BUSY 0x2 /*!< \brief in subject_notify() */
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64 #define SUBF_FREE 0x4 /*!< \brief in postponding subject_free() */
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65
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66 enum {OBJT_GEO, OBJT_COORD, OBJT_KB, OBJT_PROGM, OBJT_RDMAN};
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67
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68 struct _mouse_event {
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69 event_t event;
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70 int x, y;
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71 unsigned int but_state;
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72 unsigned int button;
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73 };
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74
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75 #define MOUSE_BUT1 0x1
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76 #define MOUSE_BUT2 0x2
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77 #define MOUSE_BUT3 0x4
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79 struct _monitor_event {
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80 event_t event;
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81 subject_t *subject; /*!< \brief Subject been monitored. */
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82 observer_t *observer; /*!< \brief Observer been added or removed. */
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83 };
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84
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85 struct _mb_kb_event {
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86 event_t event;
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87 int keycode;
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88 int sym;
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89 };
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90 typedef struct _mb_kb_event mb_kb_event_t;
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91
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92 /*! \brief Observer factory.
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93 *
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94 * It provides functions for allocation of subject and observer objects,
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95 * and strategy function for getting the subject of parent coord object.
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96 */
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97 struct _observer_factory {
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98 subject_t *(*subject_alloc)(observer_factory_t *factory);
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99 void (*subject_free)(observer_factory_t *factory, subject_t *subject);
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100 observer_t *(*observer_alloc)(observer_factory_t *factory);
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101 void (*observer_free)(observer_factory_t *factory, observer_t *observer);
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102 /*! This is a strategy function to get subjects of parents. */
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103 subject_t *(*get_parent_subject)(observer_factory_t *factory,
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104 subject_t *cur_subject);
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105 };
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106
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107 enum {EVT_ANY,EVT_MOUSE_OVER, EVT_MOUSE_OUT, EVT_MOUSE_MOVE,
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108 EVT_MOUSE_BUT_PRESS, EVT_MOUSE_BUT_RELEASE,
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109 EVT_KB_PRESS, EVT_KB_RELEASE, EVT_PROGM_COMPLETE,
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110 EVT_RDMAN_REDRAW,
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111 EVT_MONITOR_ADD, EVT_MONITOR_REMOVE, EVT_MONITOR_FREE,
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112 EVT_MOUSE_MOVE_RAW
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113 };
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114
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115 extern subject_t *subject_new(observer_factory_t *factory,
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116 void *obj, int obj_type);
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117 extern void subject_free(subject_t *subject);
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118 extern void subject_notify(subject_t *subject, event_t *evt);
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119 extern observer_t *subject_add_event_observer(subject_t *subject, int type,
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120 evt_handler hdr, void *arg);
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121 /*! \brief Add an observer for any type of events. */
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122 #define subject_add_observer(s, h, a) \
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123 subject_add_event_observer(s, EVT_ANY, h, a)
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124 extern observer_t *subject_add_event_observer_head(subject_t *subject,
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125 int type,
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126 evt_handler hdr,
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127 void *arg);
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128 /*! \brief Add an observer for any type of events at head. */
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129 #define subject_add_observer_head(s, h, a) \
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130 subject_add_event_observer_head(s, EVT_ANY, h, a)
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131 extern void subject_remove_observer(subject_t *subject,
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132 observer_t *observer);
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133 #define subject_get_object(s) ((s)->obj)
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134
224
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135 /*! \brief Set monitor for the subject.
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136 *
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137 * Monitor of a subject is another subject that would be notified when
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138 * add/remove a observer to/from the subject. It can be used to efficiently
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139 * implement translator to translate events.
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140 */
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141 #define subject_set_monitor(subject, monitor) \
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142 do { (subject)->monitor_sub = monitor; } while(0)
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143 #define subject_monitor(subject) ((subject)->monitor_sub)
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144
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145 #endif /* __OBSERVER_H_ */