【cocos2d-x从c++到js】12:回调函数1——按键回调
2014-01-25 15:17:37
标签:
cocos2d-x
js
jsb
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http://www.52php.cn/article/p-ficsibso-vm.html
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// "create" in JS
// cc.MenuItemImage.create( normalImage,selectedImage,[disabledImage],callback_fn,[this]
JSBool js_cocos2dx_CCMenuItemImage_create(JSContext *cx,uint32_t argc,jsval *vp)
{
if
(argc >= 2 && argc <= 5) {
jsval *argv = JS_ARGV(cx,vp);
JSStringWrapper arg0(argv[0]);
JSStringWrapper arg1(argv[1]);
JSStringWrapper arg2;
bool
thirdArgIsString =
true
;
jsval jsCallback = JSVAL_VOID;
jsval jsThis = JSVAL_VOID;
int
last = 2;
(argc >= 3) {
thirdArgIsString = argv[2].isString();
(thirdArgIsString) {
arg2.set(argv[2],cx);
last = 3;
}
}
cocos2d::MenuItemImage* ret = cocos2d::MenuItemImage::create(arg0.get(),arg1.get(),std::string(arg2.get()));
(argc >= 3) {
(!thirdArgIsString) {
//cc.MenuItemImage.create( normalImage,[this] )
jsCallback = argv[last++];
(argc == 4) {
jsThis = argv[last];
}
}
else
{
jsCallback = argv[last++];
(argc == 5) {
jsThis = argv[last];
}
}
}
}
JSObject *obj = bind_menu_item<cocos2d::MenuItemImage>(cx,ret,jsCallback,jsThis);
JS_SET_RVAL(cx,vp,OBJECT_TO_JSVAL(obj));
return
JS_TRUE;
}
JS_ReportError(cx,
"Invalid number of arguments. Expecting: 2 <= args <= 5"
);
JS_FALSE;
}
|
(argc >= 3) {
(!thirdArgIsString) {
jsCallback = argv[last++];
(argc == 4) {
jsThis = argv[last];
}
}
{
(argc >= 4) {
jsCallback = argv[last++];
(argc == 5) {
jsThis = argv[last];
}
}
}
}
由这句模板函数来实现回调的绑定,四个参数依次是,JS上下文,cc.MenuItemImage对应的C++对象,回调函数,和回调函数调用时的this。
17
<
class
T>
JSObject* bind_menu_item(JSContext *cx,T* nativeObj,jsval callback,jsval thisObj) {
js_proxy_t *p = jsb_get_native_proxy(nativeObj);
(p) {
addCallBackAndThis(p->obj,callback,thisObj);
p->obj;
}
{
js_type_class_t *classType = js_get_type_from_native<T>(nativeObj);
assert
(classType);
JSObject *tmp = JS_NewObject(cx,classType->jsclass,classType->proto,classType->parentProto);
// bind nativeObj <-> JSObject
js_proxy_t *proxy = jsb_new_proxy(nativeObj,tmp);
JS_AddNamedObjectRoot(cx,&proxy->obj,
typeid
(*nativeObj).name());
addCallBackAndThis(tmp,thisObj);
tmp;
}
}