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menu_driver(3) [netbsd man page]

MENU_DRIVER(3)						   BSD Library Functions Manual 					    MENU_DRIVER(3)

NAME
menu_driver -- main menu handling function LIBRARY
Curses Menu Library (libmenu, -lmenu) SYNOPSIS
#include <menu.h> int menu_driver(MENU *menu, int c); DESCRIPTION
The menu_driver() function is the guts of the menu system. It takes the commands passed by c parameter and performs the requested action on the menu given. The following commands may be given to the menu driver: Command Action REQ_LEFT_ITEM Sets the new current item to be the item to the left of the current item. REQ_RIGHT_ITEM Sets the new current item to be the item to the rights of the current item. REQ_UP_ITEM Sets the new current item to be the item above the current item. REQ_DOWN_ITEM Sets the new current item to be the item below the current item. REQ_SCR_ULINE Scroll the menu one line towards the bottom of the menu window. The new current item becomes the item immediately above the current item. REQ_SCR_DLINE Scroll the menu one line towards the top of the menu window. The new current item becomes the item immediately below the current item. REQ_SCR_DPAGE Scroll the menu one page towards the bottom of the menu window. REQ_SCR_UPAGE Scroll the menu one page towards the top of the menu window. REQ_FIRST_ITEM Set the current item to be the first item in the menu. REQ_LAST_ITEM Set the current item to be the last item in the menu. REQ_NEXT_ITEM Set the new current item to be the next item in the item array after the current item. REQ_PREV_ITEM Set the new current item to be the item before the current item in the items array. REQ_TOGGLE_ITEM If the item is selectable then toggle the item's value. REQ_CLEAR_PATTERN Clear all the characters currently in the menu's pattern buffer. REQ_BACK_PATTERN Remove the last character from the pattern buffer. REQ_NEXT_MATCH Attempt to find the next item that matches the pattern buffer. REQ_PREV_MATCH Attempt to find the previous item that matches the pattern buffer. If menu_driver() is passed a command that is greater than MAX_COMMAND then the command passed is assumed to be a user defined command and menu_driver() returns E_UNKNOWN_COMMAND. Otherwise if the command is a printable character then the character represented by the command is placed at the end of the pattern buffer and an attempt is made to match the pattern buffer against the items in the menu. RETURN VALUES
The functions return one of the following error values: E_OK The function was successful. E_SYSTEM_ERROR There was a system error during the call. E_BAD_ARGUMENT One or more of the arguments passed to the function was incorrect. E_NOT_POSTED The menu is not posted. E_UNKNOWN_COMMAND The menu driver does not recognize the request passed to it. E_NO_MATCH The character search failed to find a match. E_NOT_CONNECTED The item is not connected to a menu. E_REQUEST_DENIED The menu driver could not process the request. SEE ALSO
curses(3), menus(3) NOTES
The header <menu.h> automatically includes both <curses.h> and <eti.h>. BSD
September 10, 1999 BSD

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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; either the input is a menu navigation request, it's a printable ASCII character or it 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 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 the KEY_MOUSE special key, the associated mouse event is translated into one of the above pre-defined requests. Currently only clicks in the user window (e.g. inside the menu display area or the decoration window) are handled. If you click above the display region of the menu, a REQ_SCR_ULINE is generated, if you doubleclick a REQ_SCR_UPAGE is generated and if you tripleclick a REQ_FIRST_ITEM is generated. If you click below the display region of the menu, a REQ_SCR_DLINE is generated, if you doubleclick a REQ_SCR_DPAGE is generated and if you tripleclick a REQ_LAST_ITEM is generated. If you click at an item inside the display area of the menu, the menu cursor is positioned to that item. If you double-click at 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's exactly the purpose of this return value to signal that an application specific command should be executed. 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 couldn't be translated into a menu request an E_REQUEST_DENIED is returned. If the second argument is neither printable ASCII 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_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), menu(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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