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(scroll_conservatively): New variable.

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(redisplay_window): Obey it.
(syms_of_xdisp): Set up Lisp var.
This commit is contained in:
Richard M. Stallman 1996-11-06 23:26:02 +00:00
parent 7459d65b89
commit 0789adb299
1 changed files with 76 additions and 0 deletions
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76
src/xdisp.c
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@ -139,6 +139,10 @@ static int highlight_nonselected_windows;
Try scrolling this many lines up or down if that will bring it back. */
static int scroll_step;
/* Non-0 means scroll just far enough to bring point back on the screen,
when appropriate. */
static int scroll_conservatively;
/* Nonzero if try_window_id has made blank lines at window bottom
since the last redisplay that paused */
static int blank_end_of_window;
@ -1778,6 +1782,74 @@ redisplay_window (window, just_this_one, preserve_echo_area)
/* Try to scroll by specified few lines */
if (scroll_conservatively && !current_buffer->clip_changed
&& startp >= BEGV && startp <= ZV)
{
if (PT >= Z - XFASTINT (w->window_end_pos))
{
struct position pos;
pos = *compute_motion (Z - XFASTINT (w->window_end_pos), 0, 0, 0,
PT, XFASTINT (w->height), 0,
XFASTINT (w->width), XFASTINT (w->hscroll),
pos_tab_offset (w, startp), w);
if (pos.vpos > scroll_conservatively)
goto scroll_fail_1;
pos = *vmotion (startp, pos.vpos + 1, w);
if (! NILP (Vwindow_scroll_functions))
{
Fset_marker (w->start, make_number (pos.bufpos), Qnil);
run_hook_with_args_2 (Qwindow_scroll_functions, window,
make_number (pos.bufpos));
pos.bufpos = marker_position (w->start);
}
try_window (window, pos.bufpos);
if (cursor_vpos >= 0)
{
if (!just_this_one || current_buffer->clip_changed
|| beg_unchanged < startp)
/* Forget any recorded base line for line number display. */
w->base_line_number = Qnil;
goto done;
}
else
cancel_my_columns (w);
}
if (PT < startp)
{
struct position pos;
pos = *compute_motion (PT, 0, 0, 0,
startp, XFASTINT (w->height), 0,
XFASTINT (w->width), XFASTINT (w->hscroll),
pos_tab_offset (w, startp), w);
if (pos.vpos >= scroll_conservatively)
goto scroll_fail_1;
pos = *vmotion (startp, - pos.vpos, w);
if (! NILP (Vwindow_scroll_functions))
{
Fset_marker (w->start, make_number (pos.bufpos), Qnil);
run_hook_with_args_2 (Qwindow_scroll_functions, window,
make_number (pos.bufpos));
pos.bufpos = marker_position (w->start);
}
try_window (window, pos.bufpos);
if (cursor_vpos >= 0)
{
if (!just_this_one || current_buffer->clip_changed
|| beg_unchanged < startp)
/* Forget any recorded base line for line number display. */
w->base_line_number = Qnil;
goto done;
}
else
cancel_my_columns (w);
}
scroll_fail_1: ;
}
if (scroll_step && !current_buffer->clip_changed
&& startp >= BEGV && startp <= ZV)
{
@ -4377,6 +4449,10 @@ See also `overlay-arrow-string'.");
If that fails to bring point back on frame, point is centered instead.\n\
If this is zero, point is always centered after it moves off frame.");
DEFVAR_INT ("scroll-conservatively", &scroll_conservatively,
"*Scroll up to this many lines, to bring point back on screen.");
scroll_conservatively = 0;
DEFVAR_INT ("debug-end-pos", &debug_end_pos, "Don't ask");
DEFVAR_BOOL ("truncate-partial-width-windows",