scroll method
Implementation
int scroll(int horizontalAmount, int verticalAmount) => (ptr.ref.vtable + 3)
.cast<
Pointer<
NativeFunction<
Int32 Function(Pointer, Int32 horizontalAmount,
Int32 verticalAmount)>>>()
.value
.asFunction<
int Function(
Pointer, int horizontalAmount, int verticalAmount)>()(
ptr.ref.lpVtbl, horizontalAmount, verticalAmount);