menu_driver
Section: Miscellaneous Library Functions (3X)
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NAME
menu_driver - command-processing loop of the menu system
SYNOPSIS
#include <menu.h>
int menu_driver(MENU *menu, int c);
DESCRIPTION
Once a menu has been posted (displayed), you should funnel input events to it
through menu_driver. This routine has two major input cases; either
the input is a menu navigation request or it's a printable ASCII character.
The menu driver requests are as follows:
- 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 down a page.
- REQ_SCR_UPAGE
-
Scroll up 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/deselect an item.
- REQ_CLEAR_PATTERN
-
Clear the menu pattern buffer.
- REQ_BACK_PATTERN
-
Delete the previous character from the pattern buffer.
- REQ_NEXT_MATCH
-
Move to the next item matching the pattern match.
- REQ_PREV_MATCH
-
Move to the previous item matching the pattern match.
If the second argument is a printable ASCII character, the code appends
it to the pattern buffer and attempts to move to the next item matching
the new pattern. If there is no such match, menu_driver returns
E_NO_MATCH and deletes the appended character from the buffer.
If the second argument is one of the above pre-defined requests, the
corresponding action is performed.
If the second argument is neither printable ASCII nor one of the above
pre-defined menu requests, the drive asumes it is an application-specific
command and returns E_UNKNOWN_COMMAND. Application-defined commands
should be defined relative to MAX_COMMAND, the maximum value of these
pre-defined requests.
RETURN VALUE
menu_driver return one of the following error codes:
- E_OK
-
The routine succeeded.
- E_SYSTEM_ERROR
-
System error occurred (see errno).
- E_BAD_ARGUMENT
-
Routine detected an incorrect or out-of-range argument.
- E_BAD_STATE
-
Routine was called from an initialization or termination function.
- E_NOT_POSTED
-
The menu has not been posted.
- E_UNKNOWN_COMMAND
-
The menu driver code saw an unknown request code.
- E_NO_MATCH
-
Character failed to match.
- E_REQUEST_DENIED
-
The menu driver could not process the request.
SEE ALSO
curses(3X), menus(3x).
NOTES
The header file <menu.h> automatically includes the header files
<curses.h>.
PORTABILITY
These routines emulate the System V menu library. They were not supported on
Version 7 or BSD versions.
AUTHORS
Juergen Pfeifer. Manual pages and adaptation for new curses by Eric
S. Raymond.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- SEE ALSO
-
- NOTES
-
- PORTABILITY
-
- AUTHORS
-
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Time: 01:50:47 GMT, July 11, 2022