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-
-
-
- menu_driver - command-processing loop of the menu system
-
-
-
-SYNOPSIS
- #include
- 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 navi-
- gation 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.
- 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 decora-
- tion 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 pur-
- pose 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.
-
- 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 argu-
- ment.
-
- E_BAD_STATE
- Routine was called from an initialization or termina-
- tion 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 automatically includes the header
- files .
-
-
-
-PORTABILITY
- These routines emulate the System V menu library. They
- were not supported on Version 7 or BSD versions. The sup-
- port for mouse events is ncurses specific.
-
-
-
-AUTHORS
- Juergen Pfeifer. Manual pages and adaptation for new
- curses by Eric S. Raymond.
-
-
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-