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Editable text box widget based on mucurses and edit_string.
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Michael Brown
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Dec 20, 2006
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/* | ||
* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>. | ||
* | ||
* This program is free software; you can redistribute it and/or | ||
* modify it under the terms of the GNU General Public License as | ||
* published by the Free Software Foundation; either version 2 of the | ||
* License, or any later version. | ||
* | ||
* This program is distributed in the hope that it will be useful, but | ||
* WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
* General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU General Public License | ||
* along with this program; if not, write to the Free Software | ||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
*/ | ||
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#include <string.h> | ||
#include <assert.h> | ||
#include <gpxe/editbox.h> | ||
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/** @file | ||
* | ||
* Editable text box widget | ||
* | ||
*/ | ||
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#define EDITBOX_MIN_CHARS 3 | ||
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/** | ||
* Initialise text box widget | ||
* | ||
* @v box Editable text box widget | ||
* @v buf Text buffer | ||
* @v len Size of text buffer | ||
* @v win Containing window | ||
* @v row Row | ||
* @v col Starting column | ||
* @v width Width | ||
* | ||
*/ | ||
void init_editbox ( struct edit_box *box, char *buf, size_t len, | ||
WINDOW *win, unsigned int row, unsigned int col, | ||
unsigned int width ) { | ||
memset ( box, 0, sizeof ( *box ) ); | ||
box->string.buf = buf; | ||
box->string.len = len; | ||
box->string.cursor = strlen ( buf ); | ||
box->win = ( win ? win : stdscr ); | ||
box->row = row; | ||
box->col = col; | ||
box->width = width; | ||
} | ||
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/** | ||
* Draw text box widget | ||
* | ||
* @v box Editable text box widget | ||
* | ||
*/ | ||
void draw_editbox ( struct edit_box *box ) { | ||
size_t width = box->width; | ||
char buf[ width + 1 ]; | ||
size_t keep_len; | ||
signed int cursor_offset, underflow, overflow; | ||
size_t len; | ||
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/* Adjust starting offset so that cursor remains within box */ | ||
cursor_offset = ( box->string.cursor - box->first ); | ||
keep_len = strlen ( box->string.buf ); | ||
if ( keep_len > EDITBOX_MIN_CHARS ) | ||
keep_len = EDITBOX_MIN_CHARS; | ||
underflow = ( keep_len - cursor_offset ); | ||
overflow = ( cursor_offset - ( width - 1 ) ); | ||
if ( underflow > 0 ) { | ||
box->first -= underflow; | ||
} else if ( overflow > 0 ) { | ||
box->first += overflow; | ||
} | ||
cursor_offset = ( box->string.cursor - box->first ); | ||
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/* Construct underscore-padded string portion */ | ||
memset ( buf, '_', width ); | ||
buf[width] = '\0'; | ||
len = ( strlen ( box->string.buf ) - box->first ); | ||
if ( len > width ) | ||
len = width; | ||
memcpy ( buf, ( box->string.buf + box->first ), len ); | ||
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/* Print box content and move cursor */ | ||
if ( ! box->win ) | ||
box->win = stdscr; | ||
mvwprintw ( box->win, box->row, box->col, "%s", buf ); | ||
wmove ( box->win, box->row, ( box->col + cursor_offset ) ); | ||
} | ||
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/** | ||
* Edit text box widget | ||
* | ||
* @v box Editable text box widget | ||
* @v key Key pressed by user | ||
* @ret key Key returned to application, or zero | ||
* | ||
*/ | ||
int edit_editbox ( struct edit_box *box, int key ) { | ||
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/* Update the string itself */ | ||
key = edit_string ( &box->string, key ); | ||
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/* Update the display */ | ||
draw_editbox ( box ); | ||
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return key; | ||
} |
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#ifndef _GPXE_EDITBOX_H | ||
#define _GPXE_EDITBOX_H | ||
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/** @file | ||
* | ||
* Editable text box widget | ||
* | ||
*/ | ||
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#include <curses.h> | ||
#include <gpxe/editstring.h> | ||
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/** An editable text box widget */ | ||
struct edit_box { | ||
/** Editable string */ | ||
struct edit_string string; | ||
/** Containing window */ | ||
WINDOW *win; | ||
/** Row */ | ||
unsigned int row; | ||
/** Starting column */ | ||
unsigned int col; | ||
/** Width */ | ||
unsigned int width; | ||
/** First displayed character */ | ||
unsigned int first; | ||
}; | ||
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extern void init_editbox ( struct edit_box *box, char *buf, size_t len, | ||
WINDOW *win, unsigned int row, unsigned int col, | ||
unsigned int width ); | ||
extern void draw_editbox ( struct edit_box *box ); | ||
extern int edit_editbox ( struct edit_box *box, int key ); | ||
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#endif /* _GPXE_EDITBOX_H */ |