【cocos2d-x从c++到js】14：注册函数
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【cocos2d-x从c++到js】14：注册函数
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前面的文章中講過，在游戲啟動時，會調用大量的addRegisterCallback函數，向SpiderMonkey注冊Cocos2d-x引擎的函數。
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | ScriptingCore* sc = ScriptingCore::getInstance(); sc->addRegisterCallback(register_all_cocos2dx); sc->addRegisterCallback(register_all_cocos2dx_extension); sc->addRegisterCallback(register_cocos2dx_js_extensions); sc->addRegisterCallback(register_all_cocos2dx_extension_manual); sc->addRegisterCallback(jsb_register_chipmunk); sc->addRegisterCallback(JSB_register_opengl); sc->addRegisterCallback(jsb_register_system); sc->addRegisterCallback(MinXmlHttpRequest::_js_register); sc->addRegisterCallback(register_jsb_websocket); sc->addRegisterCallback(register_all_cocos2dx_builder); sc->addRegisterCallback(register_CCBuilderReader); sc->addRegisterCallback(register_all_cocos2dx_gui); sc->addRegisterCallback(register_all_cocos2dx_gui_manual); sc->addRegisterCallback(register_all_cocos2dx_studio); sc->addRegisterCallback(register_all_cocos2dx_studio_manual); sc->addRegisterCallback(register_all_cocos2dx_spine); sc->start(); |
以register_all_cocos2dx注冊函數為例，跳轉到實現代碼：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 | void?register_all_cocos2dx(JSContext* cx, JSObject* obj) { ????// first, try to get the ns ????JS::RootedValue nsval(cx); ????JSObject *ns; ????JS_GetProperty(cx, obj,?"cc", &nsval); ????if?(nsval == JSVAL_VOID) { ????????ns = JS_NewObject(cx, NULL, NULL, NULL); ????????nsval = OBJECT_TO_JSVAL(ns); ????????JS_SetProperty(cx, obj,?"cc", nsval); ????}?else?{ ????????JS_ValueToObject(cx, nsval, &ns); ????} ????obj = ns; ????js_register_cocos2dx_Action(cx, obj); ????js_register_cocos2dx_FiniteTimeAction(cx, obj); ????js_register_cocos2dx_ActionInstant(cx, obj); ????js_register_cocos2dx_Hide(cx, obj); ????js_register_cocos2dx_Node(cx, obj); ????js_register_cocos2dx_Scene(cx, obj); ????js_register_cocos2dx_TransitionScene(cx, obj); ????js_register_cocos2dx_TransitionEaseScene(cx, obj); ????js_register_cocos2dx_TransitionMoveInL(cx, obj); ????js_register_cocos2dx_TransitionMoveInB(cx, obj); ????js_register_cocos2dx_Layer(cx, obj); ????js_register_cocos2dx___LayerRGBA(cx, obj); ????js_register_cocos2dx_AtlasNode(cx, obj); ????js_register_cocos2dx_TileMapAtlas(cx, obj); ????js_register_cocos2dx_TransitionMoveInT(cx, obj); ????js_register_cocos2dx_TransitionMoveInR(cx, obj); ????js_register_cocos2dx_ParticleSystem(cx, obj); ????js_register_cocos2dx_ParticleSystemQuad(cx, obj); ????js_register_cocos2dx_ParticleSnow(cx, obj); ????js_register_cocos2dx_ActionInterval(cx, obj); ????js_register_cocos2dx_ActionCamera(cx, obj); ????js_register_cocos2dx_ProgressFromTo(cx, obj); ????js_register_cocos2dx_MoveBy(cx, obj); ????js_register_cocos2dx_MoveTo(cx, obj); ????js_register_cocos2dx_JumpBy(cx, obj); ????js_register_cocos2dx_ActionEase(cx, obj); ????js_register_cocos2dx_EaseBounce(cx, obj); ????js_register_cocos2dx_EaseBounceIn(cx, obj); ????js_register_cocos2dx_TransitionRotoZoom(cx, obj); ????js_register_cocos2dx_Director(cx, obj); ????js_register_cocos2dx_Texture2D(cx, obj); ????js_register_cocos2dx_EaseElastic(cx, obj); ????js_register_cocos2dx_EaseElasticOut(cx, obj); ????js_register_cocos2dx_EaseBackOut(cx, obj); ????js_register_cocos2dx_TransitionSceneOriented(cx, obj); ????js_register_cocos2dx_TransitionFlipX(cx, obj); ????js_register_cocos2dx_Spawn(cx, obj); ????js_register_cocos2dx_SimpleAudioEngine(cx, obj); ????js_register_cocos2dx_SkewTo(cx, obj); ????js_register_cocos2dx_SkewBy(cx, obj); ????js_register_cocos2dx_TransitionProgress(cx, obj); ????js_register_cocos2dx_TransitionProgressVertical(cx, obj); ????js_register_cocos2dx_TMXTiledMap(cx, obj); ????js_register_cocos2dx_GridAction(cx, obj); ????js_register_cocos2dx_Grid3DAction(cx, obj); ????js_register_cocos2dx_FadeIn(cx, obj); ????js_register_cocos2dx_AnimationCache(cx, obj); ????js_register_cocos2dx_FlipX3D(cx, obj); ????js_register_cocos2dx_FlipY3D(cx, obj); ????js_register_cocos2dx_EaseSineInOut(cx, obj); ????js_register_cocos2dx_TransitionFlipAngular(cx, obj); ????js_register_cocos2dx_EGLViewProtocol(cx, obj); ????js_register_cocos2dx_EGLView(cx, obj); ????js_register_cocos2dx_EaseElasticInOut(cx, obj); ????js_register_cocos2dx_Show(cx, obj); ????js_register_cocos2dx_FadeOut(cx, obj); ????js_register_cocos2dx_CallFunc(cx, obj); ????js_register_cocos2dx_Waves3D(cx, obj); ????js_register_cocos2dx_ParticleFireworks(cx, obj); ????js_register_cocos2dx_MenuItem(cx, obj); ????js_register_cocos2dx_MenuItemSprite(cx, obj); ????js_register_cocos2dx_MenuItemImage(cx, obj); ????js_register_cocos2dx_ParticleFire(cx, obj); ????js_register_cocos2dx_TransitionZoomFlipAngular(cx, obj); ????js_register_cocos2dx_EaseRateAction(cx, obj); ????js_register_cocos2dx_EaseIn(cx, obj); ????js_register_cocos2dx_EaseExponentialInOut(cx, obj); ????js_register_cocos2dx_EaseBackInOut(cx, obj); ????js_register_cocos2dx_EaseExponentialOut(cx, obj); ????js_register_cocos2dx_SpriteBatchNode(cx, obj); ????js_register_cocos2dx_Label(cx, obj); ????js_register_cocos2dx_Application(cx, obj); ????js_register_cocos2dx_DelayTime(cx, obj); ????js_register_cocos2dx_LabelAtlas(cx, obj); ????js_register_cocos2dx_LabelBMFont(cx, obj); ????js_register_cocos2dx_TransitionFadeTR(cx, obj); ????js_register_cocos2dx_TransitionFadeBL(cx, obj); ????js_register_cocos2dx_EaseElasticIn(cx, obj); ????js_register_cocos2dx_ParticleSpiral(cx, obj); ????js_register_cocos2dx_TiledGrid3DAction(cx, obj); ????js_register_cocos2dx_FadeOutTRTiles(cx, obj); ????js_register_cocos2dx_FadeOutUpTiles(cx, obj); ????js_register_cocos2dx_FadeOutDownTiles(cx, obj); ????js_register_cocos2dx_TextureCache(cx, obj); ????js_register_cocos2dx_ActionTween(cx, obj); ????js_register_cocos2dx_TransitionFadeDown(cx, obj); ????js_register_cocos2dx_ParticleSun(cx, obj); ????js_register_cocos2dx_TransitionProgressHorizontal(cx, obj); ????js_register_cocos2dx_TMXObjectGroup(cx, obj); ????js_register_cocos2dx_TMXLayer(cx, obj); ????js_register_cocos2dx_FlipX(cx, obj); ????js_register_cocos2dx_FlipY(cx, obj); ????js_register_cocos2dx_TransitionSplitCols(cx, obj); ????js_register_cocos2dx_Timer(cx, obj); ????js_register_cocos2dx_FadeTo(cx, obj); ????js_register_cocos2dx_Repeat(cx, obj); ????js_register_cocos2dx_Place(cx, obj); ????js_register_cocos2dx_GLProgram(cx, obj); ????js_register_cocos2dx_EaseBounceOut(cx, obj); ????js_register_cocos2dx_RenderTexture(cx, obj); ????js_register_cocos2dx_TintBy(cx, obj); ????js_register_cocos2dx_TransitionShrinkGrow(cx, obj); ????js_register_cocos2dx_Sprite(cx, obj); ????js_register_cocos2dx_LabelTTF(cx, obj); ????js_register_cocos2dx_ClippingNode(cx, obj); ????js_register_cocos2dx_ParticleFlower(cx, obj); ????js_register_cocos2dx_ParticleSmoke(cx, obj); ????js_register_cocos2dx_LayerMultiplex(cx, obj); ????js_register_cocos2dx_Blink(cx, obj); ????js_register_cocos2dx_ShaderCache(cx, obj); ????js_register_cocos2dx_JumpTo(cx, obj); ????js_register_cocos2dx_ParticleExplosion(cx, obj); ????js_register_cocos2dx_TransitionJumpZoom(cx, obj); ????js_register_cocos2dx_Touch(cx, obj); ????js_register_cocos2dx_AnimationFrame(cx, obj); ????js_register_cocos2dx_NodeGrid(cx, obj); ????js_register_cocos2dx_TMXLayerInfo(cx, obj); ????js_register_cocos2dx_TMXTilesetInfo(cx, obj); ????js_register_cocos2dx_GridBase(cx, obj); ????js_register_cocos2dx_TiledGrid3D(cx, obj); ????js_register_cocos2dx_ParticleGalaxy(cx, obj); ????js_register_cocos2dx_Twirl(cx, obj); ????js_register_cocos2dx_MenuItemLabel(cx, obj); ????js_register_cocos2dx_LayerColor(cx, obj); ????js_register_cocos2dx_FadeOutBLTiles(cx, obj); ????js_register_cocos2dx_LayerGradient(cx, obj); ????js_register_cocos2dx_TargetedAction(cx, obj); ????js_register_cocos2dx_RepeatForever(cx, obj); ????js_register_cocos2dx_CardinalSplineTo(cx, obj); ????js_register_cocos2dx_CardinalSplineBy(cx, obj); ????js_register_cocos2dx_TransitionFlipY(cx, obj); ????js_register_cocos2dx_TurnOffTiles(cx, obj); ????js_register_cocos2dx_TintTo(cx, obj); ????js_register_cocos2dx_CatmullRomTo(cx, obj); ????js_register_cocos2dx_ToggleVisibility(cx, obj); ????js_register_cocos2dx_DrawNode(cx, obj); ????js_register_cocos2dx_TransitionTurnOffTiles(cx, obj); ????js_register_cocos2dx_RotateTo(cx, obj); ????js_register_cocos2dx_TransitionSplitRows(cx, obj); ????js_register_cocos2dx_TransitionProgressRadialCCW(cx, obj); ????js_register_cocos2dx_ScaleTo(cx, obj); ????js_register_cocos2dx_TransitionPageTurn(cx, obj); ????js_register_cocos2dx_BezierBy(cx, obj); ????js_register_cocos2dx_BezierTo(cx, obj); ????js_register_cocos2dx_Menu(cx, obj); ????js_register_cocos2dx_SpriteFrame(cx, obj); ????js_register_cocos2dx_ActionManager(cx, obj); ????js_register_cocos2dx_TransitionFade(cx, obj); ????js_register_cocos2dx_TransitionZoomFlipX(cx, obj); ????js_register_cocos2dx_SpriteFrameCache(cx, obj); ????js_register_cocos2dx_TransitionCrossFade(cx, obj); ????js_register_cocos2dx_Ripple3D(cx, obj); ????js_register_cocos2dx_TransitionSlideInL(cx, obj); ????js_register_cocos2dx_TransitionSlideInT(cx, obj); ????js_register_cocos2dx_StopGrid(cx, obj); ????js_register_cocos2dx_ShakyTiles3D(cx, obj); ????js_register_cocos2dx_PageTurn3D(cx, obj); ????js_register_cocos2dx_Grid3D(cx, obj); ????js_register_cocos2dx_TransitionProgressInOut(cx, obj); ????js_register_cocos2dx_EaseBackIn(cx, obj); ????js_register_cocos2dx_SplitRows(cx, obj); ????js_register_cocos2dx_Follow(cx, obj); ????js_register_cocos2dx_Animate(cx, obj); ????js_register_cocos2dx_ShuffleTiles(cx, obj); ????js_register_cocos2dx_ProgressTimer(cx, obj); ????js_register_cocos2dx_ParticleMeteor(cx, obj); ????js_register_cocos2dx_EaseInOut(cx, obj); ????js_register_cocos2dx_TransitionZoomFlipY(cx, obj); ????js_register_cocos2dx_ScaleBy(cx, obj); ????js_register_cocos2dx_Lens3D(cx, obj); ????js_register_cocos2dx_Animation(cx, obj); ????js_register_cocos2dx_TMXMapInfo(cx, obj); ????js_register_cocos2dx_EaseExponentialIn(cx, obj); ????js_register_cocos2dx_ReuseGrid(cx, obj); ????js_register_cocos2dx_MenuItemAtlasFont(cx, obj); ????js_register_cocos2dx_Liquid(cx, obj); ????js_register_cocos2dx_OrbitCamera(cx, obj); ????js_register_cocos2dx_ParticleBatchNode(cx, obj); ????js_register_cocos2dx_Component(cx, obj); ????js_register_cocos2dx_TextFieldTTF(cx, obj); ????js_register_cocos2dx_ParticleRain(cx, obj); ????js_register_cocos2dx_Waves(cx, obj); ????js_register_cocos2dx_EaseOut(cx, obj); ????js_register_cocos2dx_MenuItemFont(cx, obj); ????js_register_cocos2dx_TransitionFadeUp(cx, obj); ????js_register_cocos2dx_EaseSineOut(cx, obj); ????js_register_cocos2dx_JumpTiles3D(cx, obj); ????js_register_cocos2dx_MenuItemToggle(cx, obj); ????js_register_cocos2dx_RemoveSelf(cx, obj); ????js_register_cocos2dx_SplitCols(cx, obj); ????js_register_cocos2dx_MotionStreak(cx, obj); ????js_register_cocos2dx_RotateBy(cx, obj); ????js_register_cocos2dx_FileUtils(cx, obj); ????js_register_cocos2dx_ProgressTo(cx, obj); ????js_register_cocos2dx_TransitionProgressOutIn(cx, obj); ????js_register_cocos2dx_CatmullRomBy(cx, obj); ????js_register_cocos2dx_Sequence(cx, obj); ????js_register_cocos2dx_Shaky3D(cx, obj); ????js_register_cocos2dx_TransitionProgressRadialCW(cx, obj); ????js_register_cocos2dx_EaseBounceInOut(cx, obj); ????js_register_cocos2dx_TransitionSlideInR(cx, obj); ????js_register_cocos2dx___NodeRGBA(cx, obj); ????js_register_cocos2dx_ParallaxNode(cx, obj); ????js_register_cocos2dx_Scheduler(cx, obj); ????js_register_cocos2dx_EaseSineIn(cx, obj); ????js_register_cocos2dx_WavesTiles3D(cx, obj); ????js_register_cocos2dx_TransitionSlideInB(cx, obj); ????js_register_cocos2dx_Speed(cx, obj); ????js_register_cocos2dx_ShatteredTiles3D(cx, obj); } |
首先看到的是從根對象中獲取一個“cc”屬性（如果獲取不到，就新建一個），因為JS中沒有名字空間的概念，所以我們使用一個cc對象來表示類似的功能。所有的類型和函數都是這個cc對象下面的屬性。在Cocos2d-x 3.0中，C++層面，類名去掉了CC的前綴，和js保持一致。
然后就是一大堆子函數，每個函數都負責注冊一個對應的類。打開js_register_cocos2dx_Sprite，這個函數負責注冊Sprite類。
打開js_register_cocos2dx_Sprite的實現代碼
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | void?js_register_cocos2dx_Sprite(JSContext *cx, JSObject *global) { ????jsb_cocos2d_Sprite_class = (JSClass *)calloc(1,?sizeof(JSClass)); ????jsb_cocos2d_Sprite_class->name =?"Sprite"; ????jsb_cocos2d_Sprite_class->addProperty = JS_PropertyStub; ????jsb_cocos2d_Sprite_class->delProperty = JS_DeletePropertyStub; ????jsb_cocos2d_Sprite_class->getProperty = JS_PropertyStub; ????jsb_cocos2d_Sprite_class->setProperty = JS_StrictPropertyStub; ????jsb_cocos2d_Sprite_class->enumerate = JS_EnumerateStub; ????jsb_cocos2d_Sprite_class->resolve = JS_ResolveStub; ????jsb_cocos2d_Sprite_class->convert = JS_ConvertStub; ????jsb_cocos2d_Sprite_class->finalize = js_cocos2d_Sprite_finalize; ????jsb_cocos2d_Sprite_class->flags = JSCLASS_HAS_RESERVED_SLOTS(2); ????static?JSPropertySpec properties[] = { ????????{0, 0, 0, JSOP_NULLWRAPPER, JSOP_NULLWRAPPER} ????}; ????static?JSFunctionSpec funcs[] = { ????????JS_FN("setSpriteFrame", js_cocos2dx_Sprite_setSpriteFrame, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setTexture", js_cocos2dx_Sprite_setTexture, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("getTexture", js_cocos2dx_Sprite_getTexture, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setFlippedY", js_cocos2dx_Sprite_setFlippedY, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setFlippedX", js_cocos2dx_Sprite_setFlippedX, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("getBatchNode", js_cocos2dx_Sprite_getBatchNode, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("getOffsetPosition", js_cocos2dx_Sprite_getOffsetPosition, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("removeAllChildrenWithCleanup", js_cocos2dx_Sprite_removeAllChildrenWithCleanup, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("updateQuadVertices", js_cocos2dx_Sprite_updateQuadVertices, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("updateTransform", js_cocos2dx_Sprite_updateTransform, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setTextureRect", js_cocos2dx_Sprite_setTextureRect, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("isFrameDisplayed", js_cocos2dx_Sprite_isFrameDisplayed, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("getAtlasIndex", js_cocos2dx_Sprite_getAtlasIndex, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setBatchNode", js_cocos2dx_Sprite_setBatchNode, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setDisplayFrameWithAnimationName", js_cocos2dx_Sprite_setDisplayFrameWithAnimationName, 2, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setTextureAtlas", js_cocos2dx_Sprite_setTextureAtlas, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("getSpriteFrame", js_cocos2dx_Sprite_getSpriteFrame, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("isDirty", js_cocos2dx_Sprite_isDirty, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setAtlasIndex", js_cocos2dx_Sprite_setAtlasIndex, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setDirty", js_cocos2dx_Sprite_setDirty, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("isTextureRectRotated", js_cocos2dx_Sprite_isTextureRectRotated, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("getTextureRect", js_cocos2dx_Sprite_getTextureRect, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("getTextureAtlas", js_cocos2dx_Sprite_getTextureAtlas, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("isFlippedX", js_cocos2dx_Sprite_isFlippedX, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("isFlippedY", js_cocos2dx_Sprite_isFlippedY, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("setVertexRect", js_cocos2dx_Sprite_setVertexRect, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("ctor", js_cocos2d_Sprite_ctor, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FS_END ????}; ????static?JSFunctionSpec st_funcs[] = { ????????JS_FN("create", js_cocos2dx_Sprite_create, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("createWithTexture", js_cocos2dx_Sprite_createWithTexture, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("createWithSpriteFrameName", js_cocos2dx_Sprite_createWithSpriteFrameName, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FN("createWithSpriteFrame", js_cocos2dx_Sprite_createWithSpriteFrame, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????????JS_FS_END ????}; ????jsb_cocos2d_Sprite_prototype = JS_InitClass( ????????cx, global, ????????jsb_cocos2d_Node_prototype, ????????jsb_cocos2d_Sprite_class, ????????dummy_constructor<cocos2d::Sprite>, 0,?// no constructor ????????properties, ????????funcs, ????????NULL,?// no static properties ????????st_funcs); ????// make the class enumerable in the registered namespace ????JSBool found; ????JS_SetPropertyAttributes(cx, global,?"Sprite", JSPROP_ENUMERATE | JSPROP_READONLY, &found); ????// add the proto and JSClass to the type->js info hash table ????TypeTest<cocos2d::Sprite> t; ????js_type_class_t *p; ????std::string typeName = t.s_name(); ????if?(_js_global_type_map.find(typeName) == _js_global_type_map.end()) ????{ ????????p = (js_type_class_t *)malloc(sizeof(js_type_class_t)); ????????p->jsclass = jsb_cocos2d_Sprite_class; ????????p->proto = jsb_cocos2d_Sprite_prototype; ????????p->parentProto = jsb_cocos2d_Node_prototype; ????????_js_global_type_map.insert(std::make_pair(typeName, p)); ????} } |
看起來比較長，其實很簡單，我們一段一段分析。
| 1 2 3 4 5 6 7 8 9 10 11 | jsb_cocos2d_Sprite_class = (JSClass *)calloc(1,?sizeof(JSClass)); jsb_cocos2d_Sprite_class->name =?"Sprite"; jsb_cocos2d_Sprite_class->addProperty = JS_PropertyStub; jsb_cocos2d_Sprite_class->delProperty = JS_DeletePropertyStub; jsb_cocos2d_Sprite_class->getProperty = JS_PropertyStub; jsb_cocos2d_Sprite_class->setProperty = JS_StrictPropertyStub; jsb_cocos2d_Sprite_class->enumerate = JS_EnumerateStub; jsb_cocos2d_Sprite_class->resolve = JS_ResolveStub; jsb_cocos2d_Sprite_class->convert = JS_ConvertStub; jsb_cocos2d_Sprite_class->finalize = js_cocos2d_Sprite_finalize; jsb_cocos2d_Sprite_class->flags = JSCLASS_HAS_RESERVED_SLOTS(2); |
首先，我們構造了一個JSClass對象，這個對象保存了一部分Sprite類的相關信息（注意，只是一部分而已）。其中包括類名，還有大量函數的占位符JS_XXXStub，這些函數是在一定情況下被調用的，如：添加刪除屬性，查看修改屬性等等。這塊其實不用特別關注，因為使用的都是SpiderMonkey自帶的缺省實現。Cocos2d-x引擎只是在最后把finalize函數替換成自己的函數了。最后那個參數表示這個類，有幾個Reserved Slots槽，這東西我們在之前講回調函數的時候見過。
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | static?JSPropertySpec properties[] = { ????{0, 0, 0, JSOP_NULLWRAPPER, JSOP_NULLWRAPPER} }; static?JSFunctionSpec funcs[] = { ????JS_FN("setSpriteFrame", js_cocos2dx_Sprite_setSpriteFrame, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setTexture", js_cocos2dx_Sprite_setTexture, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("getTexture", js_cocos2dx_Sprite_getTexture, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setFlippedY", js_cocos2dx_Sprite_setFlippedY, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setFlippedX", js_cocos2dx_Sprite_setFlippedX, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("getBatchNode", js_cocos2dx_Sprite_getBatchNode, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("getOffsetPosition", js_cocos2dx_Sprite_getOffsetPosition, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("removeAllChildrenWithCleanup", js_cocos2dx_Sprite_removeAllChildrenWithCleanup, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("updateQuadVertices", js_cocos2dx_Sprite_updateQuadVertices, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("updateTransform", js_cocos2dx_Sprite_updateTransform, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setTextureRect", js_cocos2dx_Sprite_setTextureRect, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("isFrameDisplayed", js_cocos2dx_Sprite_isFrameDisplayed, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("getAtlasIndex", js_cocos2dx_Sprite_getAtlasIndex, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setBatchNode", js_cocos2dx_Sprite_setBatchNode, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setDisplayFrameWithAnimationName", js_cocos2dx_Sprite_setDisplayFrameWithAnimationName, 2, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setTextureAtlas", js_cocos2dx_Sprite_setTextureAtlas, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("getSpriteFrame", js_cocos2dx_Sprite_getSpriteFrame, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("isDirty", js_cocos2dx_Sprite_isDirty, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setAtlasIndex", js_cocos2dx_Sprite_setAtlasIndex, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setDirty", js_cocos2dx_Sprite_setDirty, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("isTextureRectRotated", js_cocos2dx_Sprite_isTextureRectRotated, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("getTextureRect", js_cocos2dx_Sprite_getTextureRect, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("getTextureAtlas", js_cocos2dx_Sprite_getTextureAtlas, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("isFlippedX", js_cocos2dx_Sprite_isFlippedX, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("isFlippedY", js_cocos2dx_Sprite_isFlippedY, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("setVertexRect", js_cocos2dx_Sprite_setVertexRect, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("ctor", js_cocos2d_Sprite_ctor, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FS_END }; static?JSFunctionSpec st_funcs[] = { ????JS_FN("create", js_cocos2dx_Sprite_create, 0, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("createWithTexture", js_cocos2dx_Sprite_createWithTexture, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("createWithSpriteFrameName", js_cocos2dx_Sprite_createWithSpriteFrameName, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FN("createWithSpriteFrame", js_cocos2dx_Sprite_createWithSpriteFrame, 1, JSPROP_PERMANENT | JSPROP_ENUMERATE), ????JS_FS_END }; |
然后是填寫大量的參數，包括屬性，靜態屬性，函數，靜態函數。注意，因為Cocos2d-x的類完全使用Setter和Getter，所以一般是沒有屬性和靜態屬性的。比較重要的是靜態函數和普通函數。我們看一下宏函數JS_FN。他的第一個參數是函數名，這個和C++層的函數命名是一致的，第二個參數在SpiderMonkey調用JS層對應的C++函數時的回調函數，這個函數我們之前的文章中分析過。第三個參數是函數調用時的參數個數。最后一個參數，是一些訪問特性，JSPROP_PERMANENT表示不可刪除，JSPROP_ENUMERATE表示在枚舉時可見（JS的for遍歷）。
| 1 2 3 4 5 6 7 8 9 10 11 12 | jsb_cocos2d_Sprite_prototype = JS_InitClass( ????cx, global, ????jsb_cocos2d_Node_prototype, ????jsb_cocos2d_Sprite_class, ????dummy_constructor<cocos2d::Sprite>, 0,?// no constructor ????properties, ????funcs, ????NULL,?// no static properties ????st_funcs); // make the class enumerable in the registered namespace JSBool found; JS_SetPropertyAttributes(cx, global,?"Sprite", JSPROP_ENUMERATE | JSPROP_READONLY, &found); |
因為JS使用的是原型繼承，那么我們需要構造一個原型，需要的參數也很多，都是我們上面配置好的，上下文，父對象，原型，JSClass對象，各種屬性和函數。然后，會自動把這個原型設置為global（就是之前的cc對象）的一個屬性。最后，設置好訪問特性。
| 1 2 3 4 5 6 7 8 9 10 11 | TypeTest<cocos2d::Sprite> t; ????js_type_class_t *p; ????std::string typeName = t.s_name(); ????if?(_js_global_type_map.find(typeName) == _js_global_type_map.end()) ????{ ????????p = (js_type_class_t *)malloc(sizeof(js_type_class_t)); ????????p->jsclass = jsb_cocos2d_Sprite_class; ????????p->proto = jsb_cocos2d_Sprite_prototype; ????????p->parentProto = jsb_cocos2d_Node_prototype; ????????_js_global_type_map.insert(std::make_pair(typeName, p)); ????} |
最后這段代碼是Cocos2d-x引擎自己做的一個設計，把類型信息存到一個map里，這個設計以后會經常見到?？梢杂脕聿樵?#xff0c;另外在JS虛擬機清空時，也用來遍歷刪除對應的類型信息。做法是先放到一個map里，然后cleanup時遍歷這個map即可。就不贅述了。
?本文轉自 老G 51CTO博客，原文鏈接：http://blog.51cto.com/goldlion/1357617，如需轉載請自行聯系原作者
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