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(Frecenter): Handle centering in graphical frames

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specially.  Centering on the basis of line counts doesn't work
reliably with variable-height lines.
This commit is contained in:
Gerd Moellmann 2001-01-02 15:32:31 +00:00
parent e6a0814f18
commit 6df47b592a
1 changed files with 46 additions and 17 deletions
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63
src/window.c
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@ -4488,15 +4488,14 @@ redraws with point in the center of the current window.")
(arg)
register Lisp_Object arg;
{
register struct window *w = XWINDOW (selected_window);
register int ht = displayed_window_lines (w);
struct position pos;
struct window *w = XWINDOW (selected_window);
struct buffer *buf = XBUFFER (w->buffer);
struct buffer *obuf = current_buffer;
int center_p = 0;
int charpos, bytepos;
if (NILP (arg))
{
extern int frame_garbaged;
int i;
/* Invalidate pixel data calculated for all compositions. */
@ -4505,31 +4504,61 @@ redraws with point in the center of the current window.")
Fredraw_frame (w->frame);
SET_FRAME_GARBAGED (XFRAME (WINDOW_FRAME (w)));
XSETFASTINT (arg, ht / 2);
center_p = 1;
}
else if (CONSP (arg)) /* Just C-u. */
{
XSETFASTINT (arg, ht / 2);
}
center_p = 1;
else
{
arg = Fprefix_numeric_value (arg);
CHECK_NUMBER (arg, 0);
}
if (XINT (arg) < 0)
XSETINT (arg, XINT (arg) + ht);
set_buffer_internal (buf);
pos = *vmotion (PT, - XINT (arg), w);
set_marker_both (w->start, w->buffer, pos.bufpos, pos.bytepos);
w->start_at_line_beg = ((pos.bytepos == BEGV_BYTE
|| FETCH_BYTE (pos.bytepos - 1) == '\n')
? Qt : Qnil);
/* Handle centering on a gfaphical frame specially. Such frames can
have variable-height lines and centering point on the basis of
line counts would lead to strange effects. */
if (center_p && FRAME_WINDOW_P (XFRAME (w->frame)))
{
struct it it;
struct text_pos pt;
SET_TEXT_POS (pt, PT, PT_BYTE);
start_display (&it, w, pt);
move_it_vertically (&it, - it.last_visible_y / 2);
charpos = IT_CHARPOS (it);
bytepos = IT_BYTEPOS (it);
}
else
{
struct position pos;
if (center_p)
{
int ht = displayed_window_lines (w);
arg = make_number (ht / 2);
}
else if (XINT (arg) < 0)
{
int ht = displayed_window_lines (w);
XSETINT (arg, XINT (arg) + ht);
}
pos = *vmotion (PT, - XINT (arg), w);
charpos = pos.bufpos;
bytepos = pos.bytepos;
}
/* Set the new window start. */
set_marker_both (w->start, w->buffer, charpos, bytepos);
w->force_start = Qt;
if (bytepos == BEGV_BYTE || FETCH_BYTE (bytepos - 1) == '\n')
w->start_at_line_beg = Qt;
else
w->start_at_line_beg = Qnil;
set_buffer_internal (obuf);
return Qnil;
}