func (self *GObjectObject) Connect(signal string, fun func()) {
cgo_signal := C.CString(signal)
defer C.free(unsafe.Pointer(cgo_signal))
callback := &Callback{uintptr(unsafe.Pointer(&fun)), &fun}
_callbacks[callback.id] = callback
C._signal_connect(self.GetGObject(),
cgo_signal, unsafe.Pointer(callback))
}
func (o *Object) connect(noi bool, sid SignalId, detail Quark, cb_func,
param0 interface{}) {
cb := reflect.ValueOf(cb_func)
if cb.Kind() != reflect.Func {
panic("cb_func isn't a function")
}
// Check that function parameters and return value match to signal
var sq C.GSignalQuery
C.g_signal_query(C.guint(sid), &sq)
ft := cb.Type()
if ft.NumOut() > 1 || ft.NumOut() == 1 && Type(sq.return_type) == TYPE_NONE {
panic("Number of function return values doesn't match signal spec.")
}
poffset := 2
if param0 == nil {
// There is no param0
poffset--
}
if noi {
// There is no instance on which signal was emited as first parameter
poffset--
} else if !o.Type().Match(ft.In(poffset - 1)) {
panic(fmt.Sprintf(
"Callback #%d param. type %s doesn't match signal source: %s",
poffset-1, ft.In(poffset-1), o.Type(),
))
}
n_params := int(sq.n_params)
if ft.NumIn() != n_params+poffset {
panic(fmt.Sprintf(
"Number of function parameters #%d isn't equal to signal spec: #%d",
ft.NumIn(), n_params+poffset,
))
}
if ft.NumOut() != 0 && !Type(sq.return_type).Match(ft.Out(0)) {
panic("Type of function return value doesn't match signal spec.")
}
if n_params > 0 {
pt := (*[1 << 16]Type)(unsafe.Pointer(sq.param_types))[:int(sq.n_params)]
for i := 0; i < n_params; i++ {
if !pt[i].Match(ft.In(i + poffset)) {
panic(fmt.Sprintf(
"Callback #%d param. type %s doesn't match signal spec %s",
i+poffset, ft.In(i+poffset), pt[i],
))
}
}
}
// Setup closure and connect it to signal
var gocl *C.GoClosure
p0 := reflect.ValueOf(param0)
// Check type of #0 parameter which is set by Connect method
switch p0.Kind() {
case reflect.Invalid:
gocl = C._object_closure_new(gBoolean(noi), nil)
case reflect.Ptr:
if !p0.Type().AssignableTo(ft.In(0)) {
panic(fmt.Sprintf(
"Callback #0 parameter type: %s doesn't match signal spec: %s",
ft.In(0), p0.Type(),
))
}
gocl = C._object_closure_new(gBoolean(noi), C.gpointer(p0.Pointer()))
default:
panic("Callback parameter #0 isn't a pointer nor nil")
}
gocl.h_id = C._signal_connect(o.g(), C.guint(sid), C.GQuark(detail), gocl)
oh := obj_handlers[uintptr(o.p)]
if oh == nil {
oh = make(map[SigHandlerId]*sigHandler)
obj_handlers[uintptr(o.p)] = oh
}
oh[SigHandlerId(gocl.h_id)] = &sigHandler{cb, p0} // p0 for prevent GC
}