392 lines
16 KiB
Groff
392 lines
16 KiB
Groff
.\"
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.\" Copyright (c) 1995, Jordan Hubbard
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.\"
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.\" All rights reserved.
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.\"
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.\" This manual page may be used, modified, copied, distributed, and
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.\" sold, in both source and binary form provided that the above
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.\" copyright and these terms are retained, verbatim, as the first
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.\" lines of this file. Under no circumstances is the author
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.\" responsible for the proper functioning of the software described herein
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.\" nor does the author assume any responsibility for damages incurred with
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.\" its use.
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.\"
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.\" $Id$
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.\"
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.Dd December 18, 1995
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.Dt dialog 3
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.Os FreeBSD 2
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.Sh NAME
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.Nm draw_shadow ,
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.Nm draw_box ,
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.Nm line_edit ,
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.Nm strheight ,
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.Nm strwidth ,
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.Nm dialog_create_rc,
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.Nm dialog_yesno ,
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.Nm dialog_prgbox ,
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.Nm dialog_msgbox ,
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.Nm dialog_textbox ,
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.Nm dialog_menu ,
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.Nm dialog_checklist ,
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.Nm dialog_radiolist ,
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.Nm dialog_inputbox ,
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.Nm dialog_clear_norefresh ,
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.Nm dialog_clear ,
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.Nm dialog_update ,
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.Nm dialog_fselect ,
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.Nm dialog_notify ,
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.Nm dialog_mesgbox ,
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.Nm dialog_gauge ,
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.Nm init_dialog ,
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.Nm end_dialog ,
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.Nm use_helpfile ,
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.Nm use_helpline ,
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.Nm get_helpline ,
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.Nm restore_helpline
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.Nd Provide a simple ncurses-based "GUI" interface.
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.Sh DESCRIPTION
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The dialog library attempts to provide a fairly simplistic set of
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fixed-presentation menus, input boxes, gauges, file requestors and
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other general purpose "GUI" (a bit of a stretch, since it uses
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ncurses) objects. Since the library also had its roots in a
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shell-script writer's utility (see the \fBdialog(1)\fR command), the
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early API was somewhat primitively based on strings being passed in or
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out and parsed. This API was later extended to take either the
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original arguments or arrays of \fBdialogMenuItem\fR structures,
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giving the user much more control over the internal behavior of each
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control. The \fBdialogMenuItem\fR structure internals are public:
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.nf
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typedef struct _dmenu_item {
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char *\fBprompt\fR;
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char *\fBtitle\fR;
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int (*\fBchecked\fR)(struct _dmenu_item *self);
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int (*\fBfire\fR)(struct _dmenu_item *self);
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int (*\fBselected\fR)(struct _dmenu_item *self, int is_selected);
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void *\fBdata\fR;
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char \fBlbra\fR, \fBmark\fR, \fBrbra\fR;
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} \fBdialogMenuItem\fR;
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.fi
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The \fBprompt\fR and \fBtitle\fR strings are pretty much self-explanatory,
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and the \fBchecked\fR and \fBfire\fR function pointers provide optional
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display and action hooks (the \fBdata\fR variable being available for
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the convenience of those hooks) when more tightly coupled feedback between
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a menu object and user code is required. The \fBselected\fR hook also
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allows you to verify whether or not a given item is selected (the cursor is
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over it) for implementing pretty much any possible context-sensitive
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behavior. A number of clever tricks for simulating various kinds of item
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types can also be done by adjusting the values of \fBlbra\fR
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(default: '['), \fB\mark\fR (default: '*' for radio menus, 'X' for check menus)
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and \fBrbra\fR (default: ']') and declaring a reasonable \fBchecked\fR hook,
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which should return TRUE for the `marked' state and FALSE for `unmarked.'
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If an item has a \fBfire\fR hook associated with it, it will also be called
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whenever the item is "toggled" in some way and should return one of the
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following codes:
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.nf
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#define DITEM_SUCCESS 0 /* Successful completion */
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#define DITEM_FAILURE -1 /* Failed to "fire" */
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#define DITEM_LEAVE_MENU -2 /* Treat selection as "Ok" */
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#define DITEM_REDRAW -3 /* Menu has changed, redraw it */
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Two special globals also exist for putting a dialog at any arbitrary
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X,Y location (the early designers rather short-sightedly made no provisions
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for this). If set to zero, the default centering behavior will be in
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effect.
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.fi
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.Sh SYNOPSIS
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.Fd #include <dialog.h>
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.Ft "void"
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.Fn draw_shadow "WINDOW *win" "int y" "int x" "int height" "int width"
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Draws a shadow in curses window \fBwin\fR using the dimensions
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of \fBx, y, width\fR and \fBheight\fR. Returns 0 on success, -1 on failure.
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.Ft "void"
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.Fn draw_box "WINDOW *win" "int y" "int x" "int height" "int width" "chtype box" "chtype border"
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Draws a bordered box using the dimensions of \fBx, y, width\fR and
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\fBheight\fR. The attributes from \fBbox\fR and \fBborder\fR are
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used, if specified, while painting the box and border regions of the
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object.
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.Ft "int"
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.Fn line_edit "WINDOW *dialog" "int box_y" "int box_x" "int flen" "int box_width" "chtype attrs" "int first" "u_char *result"
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Invoke a simple line editor with an edit box of dimensions \fBbox_x,
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box_y\fR and \fBbox_width\fR. The field length is constrained by
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\fBflen\fR, starting at the \fBfirst\fR character specified and
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optionally displayed with character attributes \fBattrs\fR. The
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string being edited is stored in \fBresult\fR.
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Returns 0 on success, -1 on failure.
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.Ft "int"
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.Fn strheight "const char *p"
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Returns the height of string in \fBp\fR, counting newlines.
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.Ft "int"
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.Fn strwidth "const char *p"
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Returns the width of string in \fBp\fR, counting newlines.
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.Ft "void"
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.Fn dialog_create_rc "u_char *filename"
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Dump dialog library settings into \fBfilename\fR for later retreival
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as defaults. Returns 0 on success, -1 on failure.
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.Ft "int"
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.Fn dialog_yesno "u_char *title" "u_char *prompt" "int height" "int width"
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Display a text box using \fBtitle\fR and \fBprompt\fR strings of dimensions
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\fBheight\fR and \fBwidth\fR. Also paint a pair of \fBYes\fR and \fBNo\fR
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buttons at the bottom. If the \fBYes\fR button is chosen, return FALSE.
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If \fBNo\fR, return TRUE.
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.Ft "int"
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.Fn dialog_prgbox "u_char *title" "u_char *line" "int height" "int width" "int pause" "int use_shell"
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Display a text box of dimensions \fBheight\fR and \fBwidth\fR
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containing the output of command \fBline\fR. If \fBuse_shell\fR is
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TRUE, \fBline\fR is passed as an argument to \fBsh(1)\fR, otherwise it
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is simply passed to \fBexec(3)\fR. If \fBpause\fR is TRUE, a final
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confirmation requestor will be put up when execution terminates.
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Returns 0 on success, -1 on failure.
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.Ft "int"
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.Fn dialog_textbox "u_char *title" "u_char *prompt" "int height" "int width"
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Display a text box containing the contents of string \fBprompt\fR of dimensions
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\fBheight\fR and \fBwidth\fR.
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Returns 0 on success, -1 on failure.
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.Ft "int"
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.Fn dialog_menu "u_char *title" "u_char *prompt" "int height" "int width" "int menu_height" "int item_no" "void *itptr" "u_char *result, int *ch, int *sc"
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Display a menu of dimensions \fBheight\fR and \fBwidth\fR with an
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optional internal menu height of \fBmenu_height\fR. The \fBitem_no\fR
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and \fBitptr\fR arguments are of particular importance since they,
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together, determine which of the 2 available APIs to use. To use the
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older and traditional interface, \fBitem_no\fR should be a positive
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integer representing the number of string pointer pairs to find in
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\fBitptr\fR (which should be of type \fBchar **\fR), the strings are
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expected to be in prompt and title order for each item and the
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\fBresult\fR parameter is expected to point to an array where the
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prompt string of the item selected will be copied. To use the newer
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interface, \fBitem_no\fR should be a \fInegative\fR integer
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representing the number of \fBdialogMenuItem\fR structures pointed to
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by \fBitptr\fR (which should be of type \fBdialogMenuItem *\fR), one
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structure per item. In the new interface, the \fBresult\fR variable
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is used as a simple boolean (not a pointer) and should be NULL if
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\fBitptr\fR only points to menu items and the default \fBOK\fR and
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\fBCancel\fR buttons are desired. If \fBresult\fR is non-NULL, then
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\fBitptr\fR is actually expected to point 2 locations \fBpast\fR the
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start of the menu item list. \fBitptr\fR[-1] is then expected to
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point to an item representing the \fBCancel\fR button, from which the
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\fBprompt\fR and \fBfire\fR actions are used to override the default
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behavior, and \fBitptr\fR[-2] to the same for the \fBOK\fR button.
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Using either API behavior, the \fBch\fR and \fBsc\fR values may be passed in to preserve current
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item selection and scroll position values across calls.
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Returns 0 on success, 1 on Cancel and -1 on failure or ESC.
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.Ft "int"
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.Fn dialog_checklist "u_char *title" "u_char *prompt" "int height" "int width" "int m_height" "int item_no" "void *itptr" "u_char *result"
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Display a menu of dimensions \fBheight\fR and \fBwidth\fR with an
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optional internal menu height of \fBmenu_height\fR. The \fBitem_no\fR
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and \fBitptr\fR arguments are of particular importance since they,
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together, determine which of the 2 available APIs to use. To use the
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older and traditional interface, \fBitem_no\fR should be a positive
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integer representing the number of string pointer tuples to find in
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\fBitptr\fR (which should be of type \fBchar **\fR), the strings are
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expected to be in prompt, title and state ("on" or "off") order for
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each item and the \fBresult\fR parameter is expected to point to an
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array where the prompt string of the item(s) selected will be
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copied. To use the newer interface, \fBitem_no\fR should be a
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\fInegative\fR integer representing the number of \fBdialogMenuItem\fR
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structures pointed to by \fBitptr\fR (which should be of type
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\fBdialogMenuItem *\fR), one structure per item. In the new interface,
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the \fBresult\fR variable is used as a simple boolean (not a pointer)
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and should be NULL if \fBitptr\fR only points to menu items and the
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default \fBOK\fR and \fBCancel\fR buttons are desired. If
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\fBresult\fR is non-NULL, then \fBitptr\fR is actually expected to
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point 2 locations \fBpast\fR the start of the menu item list.
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\fBitptr\fR[-1] is then expected to point to an item representing the
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\fBCancel\fR button, from which the \fBprompt\fR and \fBfire\fR
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actions are used to override the default behavior, and \fBitptr\fR[-2]
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to the same for the \fBOK\fR button.
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In the standard API model, the menu supports the selection of multiple items,
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each of which is marked with an `X' character to denote selection. When
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the OK button is selected, the prompt values for all items selected are
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concatenated into the \fBresult\fR string.
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In the new API model, it is not actually necessary to preserve
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"checklist" semantics at all since practically everything about how
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each item is displayed or marked as "selected" is fully configurable.
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You could have a single checklist menu that actually contained a group
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of items with "radio" behavior, "checklist" behavior and standard menu
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item behavior. The only reason to call \fBdialog_checklist\fR over
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\fBdialog_radiolist\fR in the new API model is to inherit the base
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behavior, you're no longer constrained by it.
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Returns 0 on success, 1 on Cancel and -1 on failure or ESC.
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.Ft "int"
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.Fn dialog_radiolist "u_char *title" "u_char *prompt" "int height" "int width" "int m_height" "int item_no" "void *it" "u_char *result"
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Display a menu of dimensions \fBheight\fR and \fBwidth\fR with an
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optional internal menu height of \fBmenu_height\fR. The \fBitem_no\fR
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and \fBitptr\fR arguments are of particular importance since they,
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together, determine which of the 2 available APIs to use. To use the
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older and traditional interface, \fBitem_no\fR should be a positive
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integer representing the number of string pointer tuples to find in
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\fBitptr\fR (which should be of type \fBchar **\fR), the strings are
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expected to be in prompt, title and state ("on" or "off") order for
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each item and the \fBresult\fR parameter is expected to point to an
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array where the prompt string of the item(s) selected will be
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copied. To use the newer interface, \fBitem_no\fR should be a
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\fInegative\fR integer representing the number of \fBdialogMenuItem\fR
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structures pointed to by \fBitptr\fR (which should be of type
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\fBdialogMenuItem *\fR), one structure per item. In the new interface,
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the \fBresult\fR variable is used as a simple boolean (not a pointer)
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and should be NULL if \fBitptr\fR only points to menu items and the
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default \fBOK\fR and \fBCancel\fR buttons are desired. If
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\fBresult\fR is non-NULL, then \fBitptr\fR is actually expected to
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point 2 locations \fBpast\fR the start of the menu item list.
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\fBitptr\fR[-1] is then expected to point to an item representing the
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\fBCancel\fR button, from which the \fBprompt\fR and \fBfire\fR
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actions are used to override the default behavior, and \fBitptr\fR[-2]
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does the same for the traditional \fBOK\fR button.
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In the standard API model, the menu supports the selection of only one
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of multiple items, the currently active item marked with an `*'
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character to denote selection. When the OK button is selected, the
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prompt value for this item is copied into the \fBresult\fR string.
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In the new API model, it is not actually necessary to preserve
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"radio button" semantics at all since practically everything about how
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each item is displayed or marked as "selected" is fully configurable.
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You could have a single radio menu that actually contained a group
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of items with "checklist" behavior, "radio" behavior and standard menu
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item behavior. The only reason to call \fBdialog_radiolist\fR over
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\fBdialog_checklistlist\fR in the new API model is to inherit the base
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behavior.
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Returns 0 on success, 1 on Cancel and -1 on failure or ESC.
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.Ft "int"
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.Fn dialog_inputbox "u_char *title" "u_char *prompt" "int height" "int width" "u_char *result"
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Displays a single-line text input field in a box displaying \fBtitle\fR and \fBprompt\fR
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of dimensions \fBheight\fR and \fBwidth\fR. The field entered is stored in \fBresult\fR.
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Returns 0 on success, -1 on failure or ESC.
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.Ft "char *"
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.Fn dialog_fselect "char *dir" "char *fmask"
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Brings up a file selector dialog starting at \fBdir\fR and showing only those file names
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matching \fBfmask\fR.
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Returns filename selected or NULL.
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.Ft "int"
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.Fn dialog_dselect "char *dir" "char *fmask"
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Brings up a directory selector dialog starting at \fBdir\fR and showing only those directory names
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matching \fBfmask\fR.
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Returns directory name selected or NULL.
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.Ft "void"
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.Fn dialog_notify "char *msg"
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Bring up a generic "hey, you!" notifier dialog containing \fBmsg\fR.
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.Ft "int"
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.Fn dialog_mesgbox "u_char *title" "u_char *prompt" "int height" "int width"
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Like a notifier dialog, but with more control over \fBtitle\fR, \fBprompt\fR, \fBwidth\fR and
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\fBheight\fR. This object will also wait for user confirmation, unlike \fBdialog_notify\fR.
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Returns 0 on success, -1 on failure.
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.Ft "void"
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.Fn dialog_gauge "u_char *title" "u_char *prompt" "int y" "int x" "int height" "int width" "int perc"
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Display a horizontal bar-graph style gauge. A value of \fB100\fR for \fBperc\fR constitutes
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a full gauge, a value of \fB0\fR an empty one.
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.Ft "void"
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.Fn use_helpfile "char *helpfile"
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For any menu supporting context sensitive help, invoke the text box
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object on this file whenever the \fBF1\fR key is pressed.
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.Ft "void"
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.Fn use_helpline "char *helpline"
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Display this line of helpful text below any menu being displayed.
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.Ft "char *"
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.Fn get_helpline "void"
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Get the current value of the helpful text line.
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.Ft "void"
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.Fn dialog_clear_norefresh "void"
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Clear the screen back to the dialog background color, but don't refresh the contents
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just yet.
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.Ft "void"
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.Fn dialog_clear "void"
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Clear the screen back to the dialog background color immediately.
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.Ft "void"
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.Fn dialog_update "void"
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Do any pending screen refreshes now.
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.Ft "void"
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.Fn init_dialog "void"
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Initialize the dialog library (call this routine before any other dialog API calls).
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.Ft "void"
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.Fn end_dialog "void"
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Shut down the dialog library (call this if you need to get back to sanity).
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.Sh SEE ALSO
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.Xr dialog 1 ,
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.Xr ncurses 3
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.Sh AUTHORS
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The primary author would appear to be Savio Lam <lam836@cs.cuhk.hk> with contributions over
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the years by Stuart Herbert <S.Herbert@sheffield.ac.uk>, Marc van Kempen <wmbfmk@urc.tue.nl>,
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Andrey Chernov <ache@freebsd.org> and Jordan Hubbard <jkh@freebsd.org>.
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.Sh HISTORY
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These functions appeared in
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.Em FreeBSD-2.0
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as the \fBdialog(1)\fR command and were soon split into library
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and command by Andrey Chernov. Marc van Kempen implemented most of the
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extra controls and objects and Jordan Hubbard added the dialogMenuItem
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renovations and this man page.
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.Sh BUGS
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Sure!
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