Editable text box widget based on mucurses and edit_string.

diff --git a/src/hci/mucurses/widgets/editbox.c b/src/hci/mucurses/widgets/editbox.c
new file mode 100644 (file)
index 0000000..64c121a
--- /dev/null
+++ b/src/hci/mucurses/widgets/editbox.c
@@ -0,0 +1,115 @@
+/*
+ * 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.
+ */
+
+#include <string.h>
+#include <assert.h>
+#include <gpxe/editbox.h>
+
+/** @file
+ *
+ * Editable text box widget
+ *
+ */
+
+#define EDITBOX_MIN_CHARS 3
+
+/**
+ * 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;
+}
+
+/**
+ * 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;
+
+       /* 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 );
+
+       /* 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 );
+
+       /* 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 ) );
+}
+
+/**
+ * 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 ) {
+
+       /* Update the string itself */
+       key = edit_string ( &box->string, key );
+
+       /* Update the display */
+       draw_editbox ( box );
+
+       return key;
+}

diff --git a/src/include/gpxe/editbox.h b/src/include/gpxe/editbox.h
new file mode 100644 (file)
index 0000000..2c5e096
--- /dev/null
+++ b/src/include/gpxe/editbox.h
@@ -0,0 +1,35 @@
+#ifndef _GPXE_EDITBOX_H
+#define _GPXE_EDITBOX_H
+
+/** @file
+ *
+ * Editable text box widget
+ *
+ */
+
+#include <curses.h>
+#include <gpxe/editstring.h>
+
+/** 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;
+};
+
+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 );
+
+#endif /* _GPXE_EDITBOX_H */