Mercurial > MadButterfly

annotate include/mb_observer.h @ 335:01038b8d8f05

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Set the progm to be NULL so that we won't call mb_progm_abort when we call it at the next time. This will fix the crash issue of the dynamic. However, the dynamic is still crash sometimes if we click the button quickly. It looks like it crashes in the refresh. We need to future figure out the issue.
author wycc
date Sat, 07 Mar 2009 14:24:55 +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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3
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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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39
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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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65
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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.
29e1b2bffe4c X backend only sent EVT_MOUSE_MOVE_RAW to MadButterfly.
Thinker K.F. Li <thinker@branda.to>
parents: 206
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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
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136 #endif /* __OBSERVER_H_ */