func DetachNotifyHandler(hwnd uint32) {
key := uintptr(hwnd)
if _, exists := notifyHandlers[key]; exists {
C.HTMLayoutSetCallback(C.HWND(C.HANDLE(key)), nil, nil)
delete(notifyHandlers, key)
}
}
func AttachNotifyHandler(hwnd uint32, handler *NotifyHandler) {
key := uintptr(hwnd)
// Overwrite if it exists
notifyHandlers[key] = handler
C.HTMLayoutSetCallback(C.HWND(C.HANDLE(key)), (*[0]byte)(unsafe.Pointer(goNotifyProc)), C.LPVOID(key))
}