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annotate include/mb_observer.h @ 1396:a5672125e515

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Copy the transformation matrix when we clone it. It looks like the MB do not copy the matrix automatically. Support isuse attribute to decide how to generate the tweened matrix.
author wycc
date Sat, 02 Apr 2011 05:39:26 +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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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)
192
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Thinker K.F. Li <thinker@branda.to>
parents: 186
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131 extern void subject_remove_observer(subject_t *subject,
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Thinker K.F. Li <thinker@branda.to>
parents:
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132 observer_t *observer);
224
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Thinker K.F. Li <thinker@branda.to>
parents: 206
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133 #define subject_get_object(s) ((s)->obj)
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parents:
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134
224
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Thinker K.F. Li <thinker@branda.to>
parents: 206
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135 /*! \brief Set monitor for the subject.
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Thinker K.F. Li <thinker@branda.to>
parents: 206
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136 *
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Thinker K.F. Li <thinker@branda.to>
parents: 206
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137 * Monitor of a subject is another subject that would be notified when
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Thinker K.F. Li <thinker@branda.to>
parents: 206
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138 * add/remove a observer to/from the subject. It can be used to efficiently
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Thinker K.F. Li <thinker@branda.to>
parents: 206
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139 * implement translator to translate events.
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Thinker K.F. Li <thinker@branda.to>
parents: 206
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140 */
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Thinker K.F. Li <thinker@branda.to>
parents: 206
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141 #define subject_set_monitor(subject, monitor) \
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Thinker K.F. Li <thinker@branda.to>
parents: 206
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142 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
diff changeset
143 #define subject_monitor(subject) ((subject)->monitor_sub)
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9ab15ebc9061 Observer for mouse events
Thinker K.F. Li <thinker@branda.to>
parents:
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144
9ab15ebc9061 Observer for mouse events
Thinker K.F. Li <thinker@branda.to>
parents:
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145 #endif /* __OBSERVER_H_ */