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Provide an edit history to allow caller to efficiently update display.

This commit is contained in:
Michael Brown 2006-12-19 23:24:16 +00:00
parent abbfbd678d
commit 66007fa448
2 changed files with 27 additions and 4 deletions
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16
src/hci/editstring.c
View File

@ -35,7 +35,7 @@
*/
static void insert_delete ( struct edit_string *string, size_t delete_len,
const char *insert_text ) {
size_t old_len, max_delete_len, insert_len, max_insert_len;
size_t old_len, max_delete_len, insert_len, max_insert_len, new_len;
/* Calculate lengths */
old_len = strlen ( string->buf );
@ -47,6 +47,11 @@ static void insert_delete ( struct edit_string *string, size_t delete_len,
max_insert_len = ( ( string->len - 1 ) - ( old_len - delete_len ) );
if ( insert_len > max_insert_len )
insert_len = max_insert_len;
new_len = ( old_len - delete_len + insert_len );
/* Fill in edit history */
string->mod_start = string->cursor;
string->mod_end = ( ( new_len > old_len ) ? new_len : old_len );
/* Move data following the cursor */
memmove ( ( string->buf + string->cursor + insert_len ),
@ -113,10 +118,19 @@ static void kill_eol ( struct edit_string *string ) {
* zero, otherwise it will return the original key.
*
* This function does not update the display in any way.
*
* The string's edit history will be updated to allow the caller to
* efficiently bring the display into sync with the string content.
*/
int edit_string ( struct edit_string *string, int key ) {
int retval = 0;
/* Prepare edit history */
string->last_cursor = string->cursor;
string->mod_start = string->cursor;
string->mod_end = string->cursor;
/* Interpret key */
if ( ( key >= 0x20 ) && ( key <= 0x7e ) ) {
/* Printable character; insert at current position */
insert_character ( string, key );

15
src/include/gpxe/editstring.h
View File

@ -1,5 +1,5 @@
#ifndef _EDITSTRING_H
#define _EDITSTRING_H
#ifndef _GPXE_EDITSTRING_H
#define _GPXE_EDITSTRING_H
/** @file
*
@ -15,8 +15,17 @@ struct edit_string {
size_t len;
/** Cursor position */
unsigned int cursor;
/* The following items are the edit history */
/** Last cursor position */
unsigned int last_cursor;
/** Start of modified portion of string */
unsigned int mod_start;
/** End of modified portion of string */
unsigned int mod_end;
};
extern int edit_string ( struct edit_string *string, int key );
#endif /* _EDITSTRING_H */
#endif /* _GPXE_EDITSTRING_H */