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menu_driver(3X) menu_driver(3X)
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 three major input cases:
o The input is a form navigation request. Navigation request codes are constants
defined in <form.h>, which are distinct from the key- and character codes returned by
wgetch.
o The input is a printable character. Printable characters (which must be positive,
less than 256) are checked according to the program's locale settings.
o The input is the KEY_MOUSE special key associated with an mouse event.
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 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.
MOUSE HANDLING
If the second argument is the KEY_MOUSE special key, the associated mouse event is trans-
lated into one of the above pre-defined requests. Currently only clicks in the user win-
dow (e.g., inside the menu display area or the decoration window) are handled.
If you click above the display region of the menu:
o a REQ_SCR_ULINE is generated for a single click,
o a REQ_SCR_UPAGE is generated for a double-click and
o a REQ_FIRST_ITEM is generated for a triple-click.
If you click below the display region of the menu:
o a REQ_SCR_DLINE is generated for a single click,
o a REQ_SCR_DPAGE is generated for a double-click and
o a REQ_LAST_ITEM is generated for a triple-click.
If you click at an item inside the display area of the menu:
o the menu cursor is positioned to that item.
o If you double-click an item a REQ_TOGGLE_ITEM is generated and E_UNKNOWN_COMMAND is
returned. This return value makes sense, because a double click usually means that an
item-specific action should be returned. It is exactly the purpose of this return
value to signal that an application specific command should be executed.
o If a translation into a request was done, menu_driver returns the result of this
request.
If you clicked outside the user window or the mouse event could not be translated into a
menu request an E_REQUEST_DENIED is returned.
APPLICATION-DEFINED COMMANDS
If the second argument is neither printable nor one of the above pre-defined menu requests
or KEY_MOUSE, the drive assumes it is an application-specific command and returns
E_UNKNOWN_COMMAND. Application-defined commands should be defined relative to MAX_COM-
MAND, 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), menu(3X), getch(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. The support for mouse events is ncurses specific.
AUTHORS
Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S. Raymond.
menu_driver(3X)
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On Apache
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