annotate nodejs/coord.cc @ 744:6a988e23ad2a

A dirty implementation of removing subtree
author Thinker K.F. Li <thinker@codemud.net>
date Wed, 25 Aug 2010 14:23:06 +0800
parents dd1f3382d6a4
children 4ccb0553e804
rev   line source
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0ca8437a91fa Implement Indexed Property interceptors
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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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ce7a35abcb0d Function to instantiate coord for Javascript
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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 #define OK 0
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18
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19 /*! \page jsgc How to Manage Life-cycle of Objects for Javascript.
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20 *
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21 * The life-cycle of MadButterfly ojects are simple. A object is live
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22 * when it is created and dead when it is free. When a coord or shape
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23 * is free, it is also removed from the tree. There is not way to
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24 * remove a coord or a shape without freeing it. So, if you want to
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25 * remove a coord or a shape object from the tree, you can only free
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26 * it.
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27 *
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28 * Javascript, in conventional, does not free an object. It has GC,
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29 * the engine, being used, will free an object if it is no more
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30 * referenced. So, we had better provide a removing function, but
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31 * actually free an object. In idea situation, a new MB object would
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32 * be created for and attached on the JS object, when an object added
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33 * back to the tree. But, it means we need to keep states of an
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34 * object and create a new one with the same states later. It is
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35 * complicated. So, once an object is removed, it is invalidated.
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36 *
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37 * I hope someone would implement a higher abstract layer, in JS, to
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38 * implement the idea model that recreate a new object when an
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39 * invalidated JS object being added back.
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40 *
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41 * An invalid object is the one with NULL internal field and obj.valid
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42 * == false. The binding of MadButterfly hold a reference to every
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43 * object added to the tree of a mbrt (runtime object), and remove the
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44 * reference and invalidate it when it being removed.
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45 *
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d8764f10e141 Remove a coord from the tree in JS
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46 * For coords, they are always attached to the tree when it is valid.
d8764f10e141 Remove a coord from the tree in JS
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47 * So, binding hold a persistent reference to it. The reference is
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48 * purged when a coord being removed from the tree and being
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49 * invalidated.
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50 *
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51 * For any shape, it is not attached to the tree at begining, but is
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52 * attached to a tree laterly, or is collected by GC. The binding
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53 * hold a weak reference for a new shape, and upgrade to a strong
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54 * reference when the shape being added to the tree.
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55 */
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56
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57 using namespace v8;
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58
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b346e4699e55 Add more comment for JS binding
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59 /*! \defgroup xnjsmb_coord JS binding for coord objects.
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60 * \ingroup xnjsmb
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61 *
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62 * @{
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63 */
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64 /*! \brief Invalidate JS objects for coords and shapes in a subtree.
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65 *
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66 * \param self is the object of the root of subtree.
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67 *
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68 * \sa \ref jsgc
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69 */
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70 static void
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71 xnjsmb_coord_invalidate_subtree(Handle<Object> self) {
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72 Persistent<Object> *child_hdl;
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73 Persistent<Object> *mem_hdl;
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74 coord_t *coord, *child, *last_child;
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75 Handle<Object> js_rt;
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76 redraw_man_t *rdman;
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77 shape_t *mem, *last_mem;
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78 Handle<Value> _false = Boolean::New(0);
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79 int r;
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80
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81 if(!GET(self, "valid")->ToBoolean()->Value()) /* Invalidated object */
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82 return;
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83
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84 js_rt = GET(self, "mbrt")->ToObject();
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85 rdman = xnjsmb_rt_rdman(js_rt);
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86
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87 coord = (coord_t *)UNWRAP(self);
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88 rdman_coord_changed(rdman, coord);
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89
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90 /* Invalidate all coords in the subtree */
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91 last_child = NULL;
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92 FOR_COORDS_POSTORDER(coord, child) {
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93 if(last_child != NULL) {
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94 r = rdman_coord_free(rdman, coord);
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95 if(r != OK)
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96 THROW_noret("Unknown error");
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97 }
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98
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99 child_hdl = (Persistent<Object> *)mb_prop_get(&child->obj.props,
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100 PROP_JSOBJ);
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101 SET(*child_hdl, "valid", _false);
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102 WRAP(*child_hdl, NULL);
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103
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104 /* Invalidate members of a coord */
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105 last_mem = NULL;
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106 FOR_COORD_SHAPES(child, mem) {
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107 if(last_mem != NULL) {
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108 r = rdman_shape_free(rdman, last_mem);
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109 if(r != OK)
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110 THROW_noret("Unknown error");
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111 }
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112
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113 mem_hdl = (Persistent<Object> *)mb_prop_get(&mem->obj.props,
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114 PROP_JSOBJ);
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115 SET(*mem_hdl, "valid", _false);
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116 WRAP(*mem_hdl, NULL);
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117
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118 last_mem = mem;
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119 }
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120 if(last_mem != NULL) {
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121 r = rdman_shape_free(rdman, last_mem);
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122 if(r != OK)
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123 THROW_noret("Unknown error");
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124 }
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125
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126 last_child = child;
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127 }
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128 if(last_child != NULL) {
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129 r = rdman_coord_free(rdman, coord);
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130 if(r != OK)
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131 THROW_noret("Unknown error");
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132 }
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133 }
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134
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135 static void
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136 xnjsmb_coord_mod(Handle<Object> self, coord_t *coord) {
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137 Persistent<Object> *self_hdl;
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138 subject_t *subject;
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139 Handle<Value> subject_o;
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140
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141 /* Keep associated js object in property store for retrieving,
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142 * later, without create new js object.
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143 */
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144 self_hdl = new Persistent<Object>();
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145 *self_hdl = Persistent<Object>::New(self);
680
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146 mb_prop_set(&coord->obj.props, PROP_JSOBJ, self_hdl);
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147
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148 subject = coord->mouse_event;
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149 subject_o = export_xnjsmb_auto_subject_new(subject);
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150 SET(self, "mouse_event", subject_o);
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151 SET(self, "valid", Boolean::New(1));
680
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152 }
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153
661
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154 static float
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155 coord_get_index(coord_t *coord, Handle<Object> self, int idx,
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diff changeset
156 const char **err) {
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157 if(idx < 0 || idx >= 6) {
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158 *err = "Invalid index: out of range";
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159 return 0;
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160 }
557
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161
661
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162 return coord_get_matrix(coord)[idx];
557
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163 }
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164
661
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165 static float
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166 coord_set_index(coord_t *coord, Handle<Object> self,
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167 int idx, float v, const char **err) {
560
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168 Handle<Object> js_rt;
557
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169 redraw_man_t *rdman;
661
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170
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171 if(idx < 0 || idx >= 6) {
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172 *err = "Invalid index: out of range";
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173 return 0;
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174 }
557
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175
661
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176 coord_get_matrix(coord)[idx] = v;
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177
560
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178 js_rt = GET(self, "mbrt")->ToObject();
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179 rdman = xnjsmb_rt_rdman(js_rt);
557
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180 rdman_coord_changed(rdman, coord);
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181
661
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182 return v;
557
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183 }
560
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184
661
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185 static void
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186 xnjsmb_coord_add_shape(coord_t *coord, Handle<Object> self,
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187 shape_t *shape, const char **err) {
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188 Handle<Object> js_rt;
566
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189 redraw_man_t *rdman;
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190 int r;
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191
661
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192 js_rt = GET(self, "mbrt")->ToObject();
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193 rdman = xnjsmb_rt_rdman(js_rt);
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194 r = rdman_add_shape(rdman, shape, coord);
566
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195 if(r != 0)
661
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196 *err = "Unknown error";
566
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197 }
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198
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199 static void
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200 xnjsmb_coord_remove(coord_t *coord, Handle<Object> self, const char **err) {
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201 xnjsmb_coord_invalidate_subtree(self);
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202 }
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203
661
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204 #include "coord-inc.h"
562
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205
684
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206 /*! \brief This function used by \ref xnjsmb_mb_rt to wrap coord object.
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207 */
666
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208 Handle<Value> export_xnjsmb_auto_coord_new(coord_t *coord) {
695
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wycc
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209 return xnjsmb_auto_coord_new(coord);
666
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210 }
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211
562
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212 /*! \brief Initialize Javascript object for root coord of a runtime.
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213 *
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214 * \param js_rt is the runtime object to create the root object for.
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215 *
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216 * After the function, js_rt.root is the object for root coord in
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217 * Javascript.
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218 */
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219 void
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220 xnjsmb_coord_mkroot(Handle<Object> js_rt) {
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221 redraw_man_t *rdman;
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222 coord_t *root;
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223 Handle<Object> obj;
661
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224 static int init_flag = 0;
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225
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diff changeset
226 if(!init_flag) {
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227 xnjsmb_auto_coord_init();
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228 init_flag = 1;
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229 }
562
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diff changeset
230
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231 rdman = xnjsmb_rt_rdman(js_rt);
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diff changeset
232 root = rdman_get_root(rdman);
661
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diff changeset
233 obj = xnjsmb_auto_coord_new(root).As<Object>();
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diff changeset
234 SET(obj, "mbrt", js_rt);
562
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diff changeset
235
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diff changeset
236 SET(js_rt, "root", obj);
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diff changeset
237 }
684
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parents: 680
diff changeset
238
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parents: 680
diff changeset
239 /* @} */