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#ifndef lint
static char SccsId[] = "%W% %G%";
#endif
/* Module: editrdrw.c (Editor Redraw)
* Purpose: Move cursor and redraw the line after editing
* Subroutine: move_edit_cursor() returns: void
* Subroutine: place_edit_cursor() returns: void
* Subroutine: redraw_after_delete() returns: void
* Subroutine: redraw_after_insert() returns: void
* Xlib calls: none
* Copyright: 1989 Smithsonian Astrophysical Observatory
* You may do anything you like with this file except remove
* this copyright. The Smithsonian Astrophysical Observatory
* makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without
* express or implied warranty.
* Modified: {0} Michael VanHilst initial version 4 July 1989
* {n} <who> -- <does what> -- <when>
*/
#include <stdio.h>
#include <X11/Xlib.h>
#include "hfiles/edit.h"
/*
* Subroutine: move_edit_cursor
*/
void move_edit_cursor ( edit, movement )
EditStruct *edit;
int movement;
{
void place_edit_cursor();
place_edit_cursor(edit, edit->active_position + movement);
}
/*
* Subroutine: place_edit_cursor
*/
void place_edit_cursor ( edit, new_position )
EditStruct *edit;
int new_position;
{
int first_char, nchars;
int size, i;
void draw_edit_string(), draw_edit_cursor();
if( new_position < 0 )
new_position = 0;
if( new_position > edit->char_cnt )
new_position = edit->char_cnt;
if( edit->oversize ) {
if( new_position < edit->first_char_shown ) {
first_char = new_position;
edit->first_char_shown = new_position;
size = edit->pixlen[first_char] + edit->max_pixlen;
for( i = edit->char_cnt; edit->pixlen[i] > size; i-- );
nchars = i - first_char;
edit->active_position = new_position;
draw_edit_string(edit, first_char, 0, nchars);
} else if( new_position > edit->last_char_shown ) {
size = edit->pixlen[new_position + 1] - edit->max_pixlen;
for( i = 0; edit->pixlen[i] < size; i++ );
first_char = i;
edit->first_char_shown = i;
nchars = 1 + new_position - i;
edit->active_position = new_position;
draw_edit_string(edit, first_char, 0, nchars);
} else {
draw_edit_cursor(edit, 1);
edit->active_position = new_position;
draw_edit_cursor(edit, 0);
}
}
draw_edit_cursor (edit, 1);
edit->active_position = new_position;
draw_edit_cursor (edit, 0);
}
/*
* Subroutine: redraw_after_delete
* Purpose: Update the displayed string after character deletion
* Note: Characters not moved are not redrawn
* Note: Characters after any change are redrawn. If proportional
* spacing font is used, they might need it.
*/
void redraw_after_delete ( edit )
EditStruct *edit;
{
int i;
int first_char, first_x, nchars;
int size, excess;
void draw_edit_string();
/* this section covers deciding what to print */
first_char = edit->active_position;
first_x = edit->pixlen[first_char];
nchars = 1 + edit->char_cnt - edit->active_position;
if( edit->oversize ) {
/* line was oversized before */
if( (edit->pixlen[edit->active_position+1] <= edit->max_pixlen) ) {
/* line is no longer oversized */
edit->oversize = 0;
first_char = 0;
first_x = 0;
nchars = edit->char_cnt + 1;
edit->first_char_shown = 0;
} else {
/* line is still oversized */
if( edit->active_position < edit->first_char_shown )
/* active position moves back before section shown */
edit->first_char_shown = edit->active_position;
size = edit->pixlen[edit->first_char_shown] + edit->max_pixlen;
if( (excess = size - edit->pixlen[edit->char_cnt+1]) >
edit->charsz[edit->first_char_shown - 1]) {
/* offset section ends short of end of window (space for more chars) */
for( i = edit->first_char_shown - 1;
(i >= 0) && (excess > edit->charsz[i]); i-- )
excess -= edit->charsz[i];
/* move first_char_shown to use up entire space */
edit->first_char_shown = i + 1;
first_char = edit->first_char_shown;
nchars = 1 + edit->char_cnt - first_char;
} else {
/* line will run beyond space, determine how many chars will fit */
for( i = edit->char_cnt; edit->pixlen[i+1] > size; i-- );
nchars = 1 + i - first_char;
}
first_x =
edit->pixlen[edit->first_char_shown] - edit->pixlen[first_char];
}
}
draw_edit_string(edit, first_char, first_x, nchars);
}
/*
* Subroutine: redraw_after_insert
* Purpose: Update the displayed string after character insertion
* Note: Insertion is assumed to be directly before active position
* Note: Characters not moved are not redrawn
* Note: Characters after any change are redrawn. If proportional
* spacing font is used, they might need it.
*/
void redraw_after_insert ( edit, insert_cnt )
EditStruct *edit;
int insert_cnt; /* i: number of characters just inserted */
{
int i;
int first_char, first_x, nchars;
int excess, size;
void draw_edit_string();
if( edit->pixlen[edit->char_cnt + 1] > edit->max_pixlen ) {
edit->oversize = 1;
if( (edit->pixlen[edit->active_position + 1] -
edit->pixlen[edit->first_char_shown]) > edit->max_pixlen ) {
/* first_char_shown must be moved up to put active position in display */
excess = edit->pixlen[edit->active_position + 1] - edit->max_pixlen;
for( i=0; (i < edit->char_cnt) && (edit->pixlen[i] < excess); i++ );
edit->first_char_shown = i;
first_char = i;
nchars = 1 + edit->active_position - i;
} else {
/* first_char_shown can stay in place, which chars must be drawn? */
first_char = edit->active_position - insert_cnt;
size = edit->max_pixlen + edit->pixlen[edit->first_char_shown];
for( i = edit->char_cnt; edit->pixlen[i] > size; i-- );
nchars = 1 + i - first_char;
}
first_x = edit->pixlen[first_char] - edit->pixlen[edit->first_char_shown];
} else {
first_char = edit->active_position - insert_cnt;
nchars = 1 + edit->char_cnt - first_char;
first_x = edit->pixlen[first_char];
}
draw_edit_string(edit, first_char, first_x, nchars);
}
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