How can I cast a value in const Ref<InputEvent>& to InputEventMouseMotion when coding gdextension?

+1 vote

I want to get mouse input using c++. and here's my context:
void CameraManualControl::input(const Ref &event)
{
InputEventMouseMotion* mouseevent = dynamiccast<InputEventMouseMotion*>(constcast<InputEvent*>(event.ptr()));
if (mouse_event)
{...}
}
And I will the error C2027: Used undefined type "godot::InputEvent" at ref.hpp(258)
It means I cannot get InputEvent because of Ref don't know about InputEventMouseMotion.
So How can I get mouse motion using c++?

Godot version 4.0 alpha6
in Engine by (17 points)

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