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Design doc for life-cycle of MB objects for JS
author Thinker K.F. Li <thinker@codemud.net>
date Mon, 23 Aug 2010 10:23:30 +0800
parents 763a4e2bbd85
children d8764f10e141
rev   line source
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1 #include <stdio.h>
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2 #include <v8.h>
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3
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4 extern "C" {
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5 #include "mb.h"
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6 #include "mb_X_supp.h"
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7 #include "mb_tools.h"
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8 #include "X_supp_njs.h"
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9 }
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10
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11 #include "mbfly_njs.h"
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12
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13 #ifndef ASSERT
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14 #define ASSERT(x)
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15 #endif
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16
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17 /*! \page jsgc How to Manage Life-cycle of Objects for Javascript.
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18 *
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19 * The life-cycle of MadButterfly ojects are simple. A object is live
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20 * when it is created and dead when it is free. When a coord or shape
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21 * is free, it is also removed from the tree. There is not way to
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22 * remove a coord or a shape without freeing it. So, if you want to
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23 * remove a coord or a shape object from the tree, you can only free
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24 * it.
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25 *
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26 * Javascript, in conventional, does not free an object. It has GC,
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27 * the engine, being used, will free an object if it is no more
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28 * referenced. So, we had better provide a removing function, but
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29 * actually free an object. In idea situation, a new MB object would
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30 * be created for and attached on the JS object, when an object added
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31 * back to the tree. But, it means we need to keep states of an
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32 * object and create a new one with the same states later. It is
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33 * complicated. So, once an object is removed, it is invalidated.
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34 *
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35 * I hope someone would implement a higher abstract layer, in JS, to
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36 * implement the idea model that recreate a new object when an
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37 * invalidated JS object being added back.
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38 *
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39 * An invalid object is the one with NULL internal field and obj.valid
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40 * == false. The binding of MadButterfly hold a reference to every
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41 * object added to the tree of a mbrt (runtime object), and remove the
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42 * reference and invalidate it when it being removed.
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43 *
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44 * The binding also hold a weak reference to every object, it free the
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45 * object when the callback of the weak reference being called and it
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46 * being valid. If the object is invalid, the callback does nothing.
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47 */
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48
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49 using namespace v8;
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50
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51 /*! \defgroup xnjsmb_coord JS binding for coord objects.
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52 * \ingroup xnjsmb
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53 *
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54 * @{
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55 */
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56 static void
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57 xnjsmb_coord_mod(Handle<Object> self, coord_t *coord) {
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58 Persistent<Object> *self_hdl;
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59 subject_t *subject;
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60 Handle<Value> subject_o;
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61
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62 /* Keep associated js object in property store for retrieving,
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63 * later, without create new js object.
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64 */
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65 self_hdl = new Persistent<Object>(self);
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66 mb_prop_set(&coord->obj.props, PROP_JSOBJ, self_hdl);
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67
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68 subject = coord->mouse_event;
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69 subject_o = export_xnjsmb_auto_subject_new(subject);
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70 SET(self, "mouse_event", subject_o);
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71 }
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72
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73 static float
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74 coord_get_index(coord_t *coord, Handle<Object> self, int idx,
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75 const char **err) {
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76 if(idx < 0 || idx >= 6) {
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77 *err = "Invalid index: out of range";
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78 return 0;
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79 }
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80
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81 return coord_get_matrix(coord)[idx];
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82 }
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83
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84 static float
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85 coord_set_index(coord_t *coord, Handle<Object> self,
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86 int idx, float v, const char **err) {
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87 Handle<Object> js_rt;
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88 redraw_man_t *rdman;
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89
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90 if(idx < 0 || idx >= 6) {
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91 *err = "Invalid index: out of range";
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92 return 0;
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93 }
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94
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95 coord_get_matrix(coord)[idx] = v;
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96
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97 js_rt = GET(self, "mbrt")->ToObject();
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98 rdman = xnjsmb_rt_rdman(js_rt);
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99 rdman_coord_changed(rdman, coord);
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100
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101 return v;
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102 }
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103
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104 static void
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105 xnjsmb_coord_add_shape(coord_t *coord, Handle<Object> self,
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106 shape_t *shape, const char **err) {
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107 Handle<Object> js_rt;
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108 redraw_man_t *rdman;
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109 int r;
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110
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111 js_rt = GET(self, "mbrt")->ToObject();
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112 rdman = xnjsmb_rt_rdman(js_rt);
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113 r = rdman_add_shape(rdman, shape, coord);
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114 if(r != 0)
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115 *err = "Unknown error";
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116 }
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117
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118 #include "coord-inc.h"
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119
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120 /*! \brief This function used by \ref xnjsmb_mb_rt to wrap coord object.
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121 */
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122 Handle<Value> export_xnjsmb_auto_coord_new(coord_t *coord) {
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123 return xnjsmb_auto_coord_new(coord);
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124 }
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125
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126 /*! \brief Initialize Javascript object for root coord of a runtime.
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127 *
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128 * \param js_rt is the runtime object to create the root object for.
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129 *
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130 * After the function, js_rt.root is the object for root coord in
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131 * Javascript.
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132 */
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133 void
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134 xnjsmb_coord_mkroot(Handle<Object> js_rt) {
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135 redraw_man_t *rdman;
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136 coord_t *root;
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137 Handle<Object> obj;
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138 static int init_flag = 0;
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139
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140 if(!init_flag) {
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141 xnjsmb_auto_coord_init();
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142 init_flag = 1;
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143 }
562
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144
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145 rdman = xnjsmb_rt_rdman(js_rt);
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146 root = rdman_get_root(rdman);
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147 obj = xnjsmb_auto_coord_new(root).As<Object>();
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148 SET(obj, "mbrt", js_rt);
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149
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150 SET(js_rt, "root", obj);
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151 }
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152
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153 /* @} */