g-action-state-type (object)

object -- a g-action object
vtype -- the g-variant-type state type, if the action is stateful

Accessor of the state-type slot of the g-action class.

Queries the type of the state of the action. If the action is stateful, e.g. created with the g-simple-action-new-stateful function, then this function returns the g-variant-type parameter type of the state. This is the type of the initial value given as the state. All calls to the g-action-change-state function must give a g-variant parameter of this type and the g-action-state function will return a g-variant parameter of the same type.

If the action is not stateful, e.g. created with the g-simple-action-new function, then this function will return nil. In that case, the g-action-state function will return a null-pointer value and you must not call the g-action-change-state function.