get Grabbed Buttons State
Gets the current state of grabbed button-event-producing inputs.
This provides a snapshot of the state of all currently grabbed gamepad inputs that may produce button events. Each button event that may be produced by one of the grabbed inputs is mapped to the current state of the input, i.e. whether the associated button is pressed or released.
The application gets its own copy of grabbed buttons state map, which can be freely modified.
Return
a map associating each button event that may be produced by currently grabbed gamepad inputs to the current state of the input