UIHANDLER OnKeyDown

Fires when pressing a key. (self, key)

Arguments

 * self: - The widget receiving input.
 * key: - The key represented by a UTF-8 character or a control word such as "ESCAPE", "BACKSPACE", and "LSHIFT".

Details

 * Fires before (which can repeat while the button is held down).  Usually followed by  when released.
 * Requires, which another Frame can block with.
 * also requires . Fires before,  and.