> On Fri, 21 Nov 2008 11:44:47 pm august wrote:
> > hi,
> >
> > I'm looking to create something similar to the event model in a web
> > browser's DOM.
> >
> > I have a C++ object that can blit stuff to screen and I'd like to tie
> > in a callback from the javascript side for mouse events like so:
> >
> > var obj = CppObject();
> > obj.onmousedown = function ( e ) { // do stuff with e };
> >
> >
> > any ideas on how to do this? The "obj.onmousedown" will be called
> > from the C++ side of things as that is where the events are polled.
> >
> > any tips would be much appreciated. thank you - august.
> >
>
>
> Local<Value>
> callMethod(
> Local<Object> object,
> const char* methodName,
> int argc,
> Handle<Value> argv[]
> )
> {
> Local<Value> func = object->Get(String::New(methodName));
>
> if (func->IsFunction())
> {
> Local<Function> f = Local<Function>::Cast(func);
>
> return f->Call(object, argc, argv);
> }
> else
> {
> return Local<Value>();
> }
> }
thanks for this. I am doing something very similar. In my C++ object,
I have made storage for the function and for the object with:
v8::Persistent<v8::Object> self;
v8::Persistent<v8::Function> onmousedown;
These are set when the C++ object is created and when the onmousedown
callback accessor is set.
Then when I get the event, I do:
void callOnMouseDown( int x, int y) {
if ( onmousedown->IsFunction() ) {
int argc = 2;
v8::Handle<v8::Value>argv[2];
argv[0] = v8::Number::New(x);
argv[1] = v8::Number::New( y );
onmousedown->Call( self, argc, argv);
}
}
My problem is that I get a segfault if the onmousedown is called when
it hasn't been set in the javascript. Is there anyway to tell from the
C++ side if the onmousedown function has been set in the ecmascript?
Or, is there an alltogether better way of doing this?
many thanks -august.
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