Returns active keyboard layout index. [b]Note:[/b] This method is implemented on Linux, macOS and Windows. Returns the number of keyboard layouts. [b]Note:[/b] This method is implemented on Linux, macOS and Windows. Returns the ISO-639/BCP-47 language code of the keyboard layout at position [code]index[/code]. [b]Note:[/b] This method is implemented on Linux, macOS and Windows. Returns the localized name of the keyboard layout at position [code]index[/code]. [b]Note:[/b] This method is implemented on Linux, macOS and Windows. Sets active keyboard layout. [b]Note:[/b] This method is implemented on Linux, macOS and Windows.