gio:simple-action-new-stateful (name vtype state)

name -- a string with the name of the action
vtype -- a g:variant-type parameter type or a type string for the parameter to the activate function
state -- a g:variant parameter for the initial state of the action

The new g:simple-action object.

Creates a new stateful action. The state argument is the initial state of the action. All future state values must have the same g:variant-type parameter type as the initial state. A type string for the vtype argument is converted to the g:variant-type parameter type with the g:variant-type-new function.