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annotate include/mb_observer.h @ 307:b6891068109f

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Fix the boundary condition for scroll down
author wycc
date Sat, 21 Feb 2009 21:51:05 +0800
parents 29e1b2bffe4c
children 586e50f82c1f
rev   line source
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1 #ifndef __OBSERVER_H_
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2 #define __OBSERVER_H_
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4 #include "mb_tools.h"
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5
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6 typedef struct _event event_t;
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7 typedef struct _observer observer_t;
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8 typedef struct _subject subject_t;
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9 typedef struct _mouse_event mouse_event_t;
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10 typedef struct _monitor_event monitor_event_t;
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11 typedef struct _ob_factory ob_factory_t;
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12 typedef void (*evt_handler)(event_t *event, void *arg);
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13
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14 struct _event {
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15 int type; /*!< event type (a.k.a. EVT_*) */
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16 subject_t *tgt, *cur_tgt;
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17 int flags;
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18 };
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20 /*! \brief Observer mark event with EVTF_STOP_PROPAGATE flag
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21 * to stop propagation.
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22 */
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23 #define EVTF_STOP_PROPAGATE 0x1
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24 /*! \brief Observer mark event with EVTF_STOP_NOTIFY flag to stop
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25 * stop notification the event immediately.
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26 */
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27 #define EVTF_STOP_NOTIFY 0x2
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29 /*! \brief Observer of observer pattern.
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30 *
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31 * A target for receiving events.
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32 */
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33 struct _observer {
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34 int type;
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35 evt_handler hdr;
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36 void *arg;
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37 observer_t *next;
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38 };
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40 /*! \brief Subject of observer pattern.
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41 *
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42 * Observer is a pattern to decouple caller and callee,
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43 * especial for multiple callee.
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44 * \see http://en.wikipedia.org/wiki/Observer_pattern
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45 *
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46 * This implementation add a monitor facility to monitor adding/removing
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47 * observers from subjects. Monitor is another subject that monitor events
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48 * will be sent to if it is existed.
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49 */
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50 struct _subject {
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51 int obj_type; /*!< \brief type of object (a.k.a. OBJT_*). */
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52 void *obj; /*!< \brief the object this subject for. */
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53 int flags;
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54 subject_t *monitor_sub; /*!< \brief Monitor adding/removing
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55 * obervers on this subject. */
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56 ob_factory_t *factory;
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57 STAILQ(observer_t) observers;
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58 };
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59 /*! \brief Flag that make a subject to stop propagate events to parents. */
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60 #define SUBF_STOP_PROPAGATE 0x1
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61 #define SUBF_BUSY 0x2 /*!< \brief in subject_notify() */
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62 #define SUBF_FREE 0x4 /*!< \brief in postponding subject_free() */
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64 enum {OBJT_GEO, OBJT_COORD, OBJT_KB, OBJT_PROGM, OBJT_RDMAN};
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66 struct _mouse_event {
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67 event_t event;
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68 int x, y;
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69 unsigned int but_state;
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70 unsigned int button;
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71 };
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73 #define MOUSE_BUT1 0x1
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74 #define MOUSE_BUT2 0x2
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75 #define MOUSE_BUT3 0x4
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77 struct _monitor_event {
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78 event_t event;
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79 subject_t *subject; /*!< \brief Subject been monitored. */
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80 observer_t *observer; /*!< \brief Observer been added or removed. */
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81 };
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83 /*! \brief Observer factory.
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84 *
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85 * It provides functions for allocation of subject and observer objects,
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86 * and strategy function for getting the subject of parent coord object.
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87 */
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88 struct _ob_factory {
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89 subject_t *(*subject_alloc)(ob_factory_t *factory);
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90 void (*subject_free)(ob_factory_t *factory, subject_t *subject);
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91 observer_t *(*observer_alloc)(ob_factory_t *factory);
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92 void (*observer_free)(ob_factory_t *factory, observer_t *observer);
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93 /*! This is a strategy function to get subjects of parents. */
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94 subject_t *(*get_parent_subject)(ob_factory_t *factory,
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95 subject_t *cur_subject);
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96 };
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98 enum {EVT_ANY,EVT_MOUSE_OVER, EVT_MOUSE_OUT, EVT_MOUSE_MOVE,
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99 EVT_MOUSE_BUT_PRESS, EVT_MOUSE_BUT_RELEASE,
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100 EVT_KB_PRESS, EVT_KB_RELEASE, EVT_PROGM_COMPLETE,
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101 EVT_RDMAN_REDRAW,
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102 EVT_MONITOR_ADD, EVT_MONITOR_REMOVE, EVT_MONITOR_FREE,
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103 EVT_MOUSE_MOVE_RAW
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104 };
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105
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106 extern subject_t *subject_new(ob_factory_t *factory,
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107 void *obj, int obj_type);
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108 extern void subject_free(subject_t *subject);
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109 extern void subject_notify(subject_t *subject, event_t *evt);
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110 extern observer_t *subject_add_event_observer(subject_t *subject, int type,
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111 evt_handler hdr, void *arg);
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112 /*! \brief Add an observer for any type of events. */
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113 #define subject_add_observer(s, h, a) \
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114 subject_add_event_observer(s, EVT_ANY, h, a)
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115 extern observer_t *subject_add_event_observer_head(subject_t *subject,
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116 int type,
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117 evt_handler hdr,
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118 void *arg);
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119 /*! \brief Add an observer for any type of events at head. */
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120 #define subject_add_observer_head(s, h, a) \
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121 subject_add_event_observer_head(s, EVT_ANY, h, a)
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122 extern void subject_remove_observer(subject_t *subject,
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123 observer_t *observer);
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124 #define subject_get_object(s) ((s)->obj)
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125
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126 /*! \brief Set monitor for the subject.
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127 *
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128 * Monitor of a subject is another subject that would be notified when
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129 * add/remove a observer to/from the subject. It can be used to efficiently
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130 * implement translator to translate events.
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131 */
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Thinker K.F. Li <thinker@branda.to>
parents: 206
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132 #define subject_set_monitor(subject, monitor) \
29e1b2bffe4c X backend only sent EVT_MOUSE_MOVE_RAW to MadButterfly.
Thinker K.F. Li <thinker@branda.to>
parents: 206
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133 do { (subject)->monitor_sub = monitor; } while(0)
29e1b2bffe4c X backend only sent EVT_MOUSE_MOVE_RAW to MadButterfly.
Thinker K.F. Li <thinker@branda.to>
parents: 206
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134 #define subject_monitor(subject) ((subject)->monitor_sub)
73
9ab15ebc9061 Observer for mouse events
Thinker K.F. Li <thinker@branda.to>
parents:
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135
9ab15ebc9061 Observer for mouse events
Thinker K.F. Li <thinker@branda.to>
parents:
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136 #endif /* __OBSERVER_H_ */