Sets the page forwarding function to be page_func, this function will
be used to determine what will be the next page when the user presses
the forward button. Setting page_func to NULL will make the assistant
to use the default forward function, which just goes to the next visible
page.
Since 2.10
Sets the page forwarding function to be page_func, this function will be used to determine what will be the next page when the user presses the forward button. Setting page_func to NULL will make the assistant to use the default forward function, which just goes to the next visible page. Since 2.10