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annotate dox/event_dispatching.h @ 199:55533146efdf

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Add drag example
author wycc@wycc-desktop
date Sat, 06 Dec 2008 15:40:23 +0800
parents 18f8c3126cdb
children
rev   line source
191
18f8c3126cdb Refine installation instructions and document event dispatching by wycc.
Thinker K.F. Li <thinker@branda.to>
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1 /*! \page event_dispatching Event Dispatching Mechanism in MadButterfly
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2 *
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3 * by wycc
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4 *
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5 * \section evt_intro Introduction
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6 *
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7 * Event dispatching is an important job for the GUI system. Usually,
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8 * we need to handle the following events in the GUI
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9 *
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10 * - Mouse/pointer events
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11 * - Key event
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12 * - timer event
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13 * - IO event
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14 * - Repaint event
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15 *
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16 * In the rest of this article, I will discuss the event mechanism of
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17 * the MadButterfly and provide a design of event API.
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18 *
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19 * First thing go first. We will start from the most important event -
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20 * mouse evnets.
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21 *
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22 * \section evt_mouse Mouse/point events
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23 *
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24 * MadButterfly use observer design pattern to implement the event
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25 * dispatching. In this pattern, observer and subject are used to
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26 * handle events. The subject is a specific type of events. For
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27 * example, mouse events or keyboard events. Each subject can have zero
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28 * or more observers. When the system send events related to the subject,
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29 * it will call the subject_notify function of the subject, which will
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30 * notify every registered observers.
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31 *
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32 * In this way, we can decouple the components which send the events and
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33 * the components which need the events. For example, if we implement the
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34 * X and GTK backend, both of them will call subject_notify when it
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35 * receive the mouse events from the X or GTK. The observers don't
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36 * care whether the notification coming from X or GTK. The X and GTK
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37 * backend are responsible to translate the X or GTK mouse events into
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38 * the mouse subject.
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39 *
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40 * Therefore, we can use the subject as the astraction layer between
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41 * MadButterfly clients and the backend.
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42 *
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43 * To be more specific, in the current X backend. When it receive a
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44 * MotionNotify mouse event from the X server, it will send an mouse
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45 * event to the mouse event subject ob type OBJT_GEO.
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46 * \code
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47 * mouse_event.event.type = etype;
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48 * mouse_event.x = x;
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49 * mouse_event.y = y;
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50 * mouse_event.but_state = state;
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51 * mouse_event.button = button;
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52 * subject = sh_get_mouse_event_subject(shape);
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53 * factory = rdman_get_ob_factory(rdman);
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54 * subject_notify(factory, subject, (event_t *)&mouse_event);
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55 * \endcode
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56 *
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57 * The shape above is determined by the mouse position and the etype
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58 * is determined the shape under the mouse and the last shape which
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59 * receive mouse event.
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60 *
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61 * - If the mouse is on any shape,
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62 * - If the new shape is the same as the last shape, we will send the
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63 * EVT_MOUSE_MOVE events to it to notify it the mouse is moving inside it.
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64 * - If the new shape is not the same as the last shape, we will send the
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65 * EVT_MOUSE_OVER to notify it the mouse is just touch it.
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66 * - If the current shape is not the same as the last shape, send the
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67 * EVT_MOUSE_OUT to the last shape to tell it the mouse have left it.
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68 * \code
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69 * mevt = (XMotionEvent *)&evt;
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70 * x = mevt->x;
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71 * y = mevt->y;
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72 * state = get_button_state(mevt->state);
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73 *
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74 * shape = find_shape_at_pos(rdman, x, y,
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75 * &in_stroke);
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76 * if(shape != NULL) {
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77 * if(rt->last != shape) {
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78 * if(rt->last)
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79 * notify_shapes(rdman, rt->last, x, y,
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80 * EVT_MOUSE_OUT, state, 0);
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81 * notify_shapes(rdman, shape, x, y,
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82 * EVT_MOUSE_OVER, state, 0);
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83 * rt->last = shape;
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84 * } else
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85 * notify_shapes(rdman, shape, x, y,
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86 * EVT_MOUSE_MOVE, state, 0);
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87 * } else {
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88 * if(rt->last) {
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89 * notify_shapes(rdman, rt->last, x, y,
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90 * EVT_MOUSE_OUT, state, 0);
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91 * rt->last = NULL;
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92 * }
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93 * }
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94 * \endcode
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95 *
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96 * Please remember that the subject will relay the the events to all of
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97 * its parents.
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98 *
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99 * PS. Currently, the MadButterfly does not have mechanism to stop
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100 * propogation based on the result of the observer.
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101 *
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102 * \section evt_key Key event
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103 *
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104 * The key events is send as subject type OBJT_KB. Each key object has
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105 * the following fields code: The original raw keycode. sym: The symbol ID
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106 * of the raw keycode. * event.type: EVT_KB_PRESS or EVT_KB_RELEASE
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107 *
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108 * \section evt_timer Timer event
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109 *
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110 * The timer use different mechanism. It does not use the observer pattern.
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111 * Instead, it is registered as separate timer queue. Do we want to change
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112 * the implementation?
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113 *
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114 * \section evt_io IO event
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115 *
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116 * Currently, no IO events is available in the MadButterfly yet. W should
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117 * add the following IO subjects. OBJT_FD: We need to provide some function
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118 * to generate subject for file description. It will send events when teh
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119 * file descriptor become available for read/write or error. OBJT_XMLIO:
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120 * Provides functions similiar to the XMLSocket in actionscript.
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121 *
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122 * \section evt_repaint Repaint
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123 *
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124 * The repaint event is not sent directly. Instead, the X backend call
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125 * rdman_redraw_area directly to handle the repaint event. This function
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126 * will send EVT_RDMAN_REDRAW out.
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127 *
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128 * \section evt_summary Summary
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129 *
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130 * The observer pattern can be used to be the abstraction layer of the
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131 * MadButterfly. The current implementation has effectively seperate the
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132 * backend and the core engine. There is no direct call to the engine
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133 * from the backend. All messages are deliver to the MadButterfly through
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134 * the observer.
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135 */