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annotate include/mb_observer.h @ 936:a9abcdac0ae5

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Fix issue of moving lightbar of testsvg.js. The lightbar does not move as expectation. It caused by compute trasnforming matrix that transform saved points from the space when saving points to current space. The transform matrix should not include matric of the owner of saved points.
author Thinker K.F. Li <thinker@codemud.net>
date Fri, 12 Nov 2010 16:53:03 +0800
parents 586e50f82c1f
children e415c55b4a0d
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 _ob_factory ob_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 ob_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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78
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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 /*! \brief Observer factory.
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86 *
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87 * It provides functions for allocation of subject and observer objects,
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88 * and strategy function for getting the subject of parent coord object.
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89 */
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90 struct _ob_factory {
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91 subject_t *(*subject_alloc)(ob_factory_t *factory);
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92 void (*subject_free)(ob_factory_t *factory, subject_t *subject);
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93 observer_t *(*observer_alloc)(ob_factory_t *factory);
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94 void (*observer_free)(ob_factory_t *factory, observer_t *observer);
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95 /*! This is a strategy function to get subjects of parents. */
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96 subject_t *(*get_parent_subject)(ob_factory_t *factory,
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97 subject_t *cur_subject);
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98 };
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99
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100 enum {EVT_ANY,EVT_MOUSE_OVER, EVT_MOUSE_OUT, EVT_MOUSE_MOVE,
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101 EVT_MOUSE_BUT_PRESS, EVT_MOUSE_BUT_RELEASE,
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102 EVT_KB_PRESS, EVT_KB_RELEASE, EVT_PROGM_COMPLETE,
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103 EVT_RDMAN_REDRAW,
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104 EVT_MONITOR_ADD, EVT_MONITOR_REMOVE, EVT_MONITOR_FREE,
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105 EVT_MOUSE_MOVE_RAW
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106 };
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107
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108 extern subject_t *subject_new(ob_factory_t *factory,
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109 void *obj, int obj_type);
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110 extern void subject_free(subject_t *subject);
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111 extern void subject_notify(subject_t *subject, event_t *evt);
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112 extern observer_t *subject_add_event_observer(subject_t *subject, int type,
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113 evt_handler hdr, void *arg);
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114 /*! \brief Add an observer for any type of events. */
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115 #define subject_add_observer(s, h, a) \
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116 subject_add_event_observer(s, EVT_ANY, h, a)
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117 extern observer_t *subject_add_event_observer_head(subject_t *subject,
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118 int type,
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119 evt_handler hdr,
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120 void *arg);
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121 /*! \brief Add an observer for any type of events at head. */
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122 #define subject_add_observer_head(s, h, a) \
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123 subject_add_event_observer_head(s, EVT_ANY, h, a)
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124 extern void subject_remove_observer(subject_t *subject,
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125 observer_t *observer);
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126 #define subject_get_object(s) ((s)->obj)
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127
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128 /*! \brief Set monitor for the subject.
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129 *
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130 * 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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131 * 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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132 * implement translator to translate events.
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Thinker K.F. Li <thinker@branda.to>
parents: 206
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133 */
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parents: 206
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134 #define subject_set_monitor(subject, monitor) \
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Thinker K.F. Li <thinker@branda.to>
parents: 206
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135 do { (subject)->monitor_sub = monitor; } while(0)
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Thinker K.F. Li <thinker@branda.to>
parents: 206
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136 #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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137
9ab15ebc9061 Observer for mouse events
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parents:
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138 #endif /* __OBSERVER_H_ */