mitem_current.3x

ncurses 库 可能有用酒用 没用就算了 我觉得还可以用

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.\" $Id: mitem_current.3x,v 1.9 1998/12/26 19:52:34 tom Exp $
.TH mitem_current 3X ""
.SH NAME
\fBmitem_current\fR - set and get current_menu_item
.SH SYNOPSIS
\fB#include <menu.h>\fR
.br
int set_current_item(MENU *menu, const ITEM *item);
.br
ITEM *current_item(const MENU *menu);
.br
int set_top_row(MENU *menu, int row);
.br
int top_row(const MENU *menu);
.br
int item_index(const ITEM *item);
.br
.SH DESCRIPTION
The function \fBset_current_item\fR sets the current item (the item on which
the menu cursor is positioned).  \fBcurrent_item\fR returns a pointer to the
current item in the given menu.

The function \fBset_top_row\fR sets the top row of the menu to show the given
row (the top row is initially 0, and is reset to this value whenever the
\fBO_ROWMAJOR\fR option is toggled).  The item leftmost on the given row
becomes current.  The function \fBtop_row\fR returns the number of the top menu
row being displayed.

The function \fBitem_index\fR returns the (zero-origin) index of \fIitem\fR in
the menu's item pointer list.
.SH RETURN VALUE
\fBcurrent_item\fR returns \fBNULL\fR on error.

\fBtop_row\fR and \fBitem_index\fR return \fBERR\fR (the general \fBcurses\fR
error value) on error.

\fBset_current_item\fR and \fBset_top_row\fR return one of the following:
.TP 5
\fBE_OK\fR
The routine succeeded.
.TP 5
\fBE_SYSTEM_ERROR\fR
System error occurred (see \fBerrno\fR).
.TP 5
\fBE_BAD_ARGUMENT\fR
Routine detected an incorrect or out-of-range argument.
.TP 5
\fBE_BAD_STATE\fR
Routine was called from an initialization or termination function.
.TP 5
\fBE_NOT_CONNECTED\fR
No items are connected to the menu.
.SH SEE ALSO
\fBcurses\fR(3X), \fBmenu\fR(3X).
.SH NOTES
The header file \fB<menu.h>\fR automatically includes the header file
\fB<curses.h>\fR.
.SH PORTABILITY
These routines emulate the System V menu library.  They were not supported on
Version 7 or BSD versions.

The SVr4 menu library documentation specifies the \fBtop_row\fR and
\fBindex_item\fR error value as -1 (which is the value of \fBERR\fR).
.SH AUTHORS
Juergen Pfeifer.  Manual pages and adaptation for new curses by Eric
S. Raymond.
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