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menu_driver() is the workhorse of the menus subsystem. It checks to determine whether the character c is a menu request or data. If c is a request, the menu driver executes the request and reports the result. If c is data (a printable ASCII character), it enters
the data into the pattern buffer and tries to find a matching item. If no match is found, the menu driver deletes the character from the pattern buffer and returns E_NO_MATCH. If the
character is not recognized, the menu driver assumes it is an application-defined command and returns E_UNKNOWN_COMMAND.
Menu driver requests:
- REQ_LEFT_ITEM
- Move left to an item.
- REQ_RIGHT_ITEM
- Move right to an item
- REQ_UP_ITEM
- Move up to an item.
- REQ_DOWN_ITEM
- Move down to an item.
- REQ_SCR_ULINE
- Scroll up a line.
- REQ_SCR_DLINE
- Scroll down a line.
- REQ_SCR_DPAGE
- Scroll up a page.
- REQ_SCR_UPAGE
- Scroll down a page.
- REQ_FIRST_ITEM
- Move to the first item.
- REQ_LAST_ITEM
- Move to the last item.
- REQ_NEXT_ITEM
- Move to the next item.
- REQ_PREV_ITEM
- Move to the previous item.
- REQ_TOGGLE_ITEM
- Select/de-select an item.
- REQ_CLEAR_PATTERN
- Clear the menu pattern buffer.
- REQ_BACK_PATTERN
- Delete the previous character from pattern buffer.
- REQ_NEXT_MATCH
- Move the next matching item.
- REQ_PREV_MATCH
- Move to the previous matching item.
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