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vim/src/move.c
zeertzjq 2c47ab8fcd
patch 9.1.1108: 'smoothscroll' gets stuck with 'listchars' "eol" 
Problem:  'smoothscroll' gets stuck with 'listchars' "eol".
Solution: Count size of 'listchars' "eol" in line size when scrolling.
          (zeertzjq)

related: neovim/neovim#32405
closes: #16627

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
2025-02-13 20:34:34 +01:00

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/* vi:set ts=8 sts=4 sw=4 noet:
*
* VIM - Vi IMproved by Bram Moolenaar
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
* See README.txt for an overview of the Vim source code.
*/
/*
* move.c: Functions for moving the cursor and scrolling text.
*
* There are two ways to move the cursor:
* 1. Move the cursor directly, the text is scrolled to keep the cursor in the
* window.
* 2. Scroll the text, the cursor is moved into the text visible in the
* window.
* The 'scrolloff' option makes this a bit complicated.
*/
#include "vim.h"
static void redraw_for_cursorline(win_T *wp);
static int scrolljump_value(void);
static int check_top_offset(void);
static void curs_rows(win_T *wp);
typedef struct
{
linenr_T lnum; // line number
#ifdef FEAT_DIFF
int fill; // filler lines
#endif
int height; // height of added line
} lineoff_T;
static void topline_back(lineoff_T *lp);
static void botline_forw(lineoff_T *lp);
/*
* Get the number of screen lines skipped with "wp->w_skipcol".
*/
int
adjust_plines_for_skipcol(win_T *wp)
{
if (wp->w_skipcol == 0)
return 0;
int width = wp->w_width - win_col_off(wp);
int w2 = width + win_col_off2(wp);
if (wp->w_skipcol >= width && w2 > 0)
return (wp->w_skipcol - width) / w2 + 1;
return 0;
}
/*
* Return how many lines "lnum" will take on the screen, taking into account
* whether it is the first line, whether w_skipcol is non-zero and limiting to
* the window height.
*/
static int
plines_correct_topline(win_T *wp, linenr_T lnum, int limit_winheight)
{
int n;
#ifdef FEAT_DIFF
if (lnum == wp->w_topline)
n = plines_win_nofill(wp, lnum, FALSE) + wp->w_topfill;
else
#endif
n = plines_win(wp, lnum, FALSE);
if (lnum == wp->w_topline)
n -= adjust_plines_for_skipcol(wp);
if (limit_winheight && n > wp->w_height)
n = wp->w_height;
return n;
}
/*
* Compute wp->w_botline for the current wp->w_topline. Can be called after
* wp->w_topline changed.
*/
static void
comp_botline(win_T *wp)
{
int n;
linenr_T lnum;
int done;
#ifdef FEAT_FOLDING
linenr_T last;
int folded;
#endif
/*
* If w_cline_row is valid, start there.
* Otherwise have to start at w_topline.
*/
check_cursor_moved(wp);
if (wp->w_valid & VALID_CROW)
{
lnum = wp->w_cursor.lnum;
done = wp->w_cline_row;
}
else
{
lnum = wp->w_topline;
done = 0;
}
for ( ; lnum <= wp->w_buffer->b_ml.ml_line_count; ++lnum)
{
#ifdef FEAT_FOLDING
last = lnum;
folded = FALSE;
if (hasFoldingWin(wp, lnum, NULL, &last, TRUE, NULL))
{
n = 1;
folded = TRUE;
}
else
#endif
{
n = plines_correct_topline(wp, lnum, TRUE);
}
if (
#ifdef FEAT_FOLDING
lnum <= wp->w_cursor.lnum && last >= wp->w_cursor.lnum
#else
lnum == wp->w_cursor.lnum
#endif
)
{
wp->w_cline_row = done;
wp->w_cline_height = n;
#ifdef FEAT_FOLDING
wp->w_cline_folded = folded;
#endif
redraw_for_cursorline(wp);
wp->w_valid |= (VALID_CROW|VALID_CHEIGHT);
}
if (done + n > wp->w_height)
break;
done += n;
#ifdef FEAT_FOLDING
lnum = last;
#endif
}
// wp->w_botline is the line that is just below the window
wp->w_botline = lnum;
wp->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP;
set_empty_rows(wp, done);
}
/*
* Redraw when w_cline_row changes and 'relativenumber' or 'cursorline' is
* set.
*/
static void
redraw_for_cursorline(win_T *wp)
{
if ((wp->w_p_rnu
#ifdef FEAT_SYN_HL
|| wp->w_p_cul
#endif
)
&& (wp->w_valid & VALID_CROW) == 0
&& !pum_visible())
{
// win_line() will redraw the number column and cursorline only.
redraw_win_later(wp, UPD_VALID);
}
}
#ifdef FEAT_SYN_HL
/*
* Redraw when w_virtcol changes and 'cursorcolumn' is set or 'cursorlineopt'
* contains "screenline".
*/
static void
redraw_for_cursorcolumn(win_T *wp)
{
if ((wp->w_valid & VALID_VIRTCOL) == 0 && !pum_visible())
{
// When 'cursorcolumn' is set need to redraw with UPD_SOME_VALID.
if (wp->w_p_cuc)
redraw_win_later(wp, UPD_SOME_VALID);
// When 'cursorlineopt' contains "screenline" need to redraw with
// UPD_VALID.
else if (wp->w_p_cul && (wp->w_p_culopt_flags & CULOPT_SCRLINE))
redraw_win_later(wp, UPD_VALID);
}
}
#endif
/*
* Calculates how much the 'listchars' "precedes" or 'smoothscroll' "<<<"
* marker overlaps with buffer text for window "wp".
* Parameter "extra2" should be the padding on the 2nd line, not the first
* line. When "extra2" is -1 calculate the padding.
* Returns the number of columns of overlap with buffer text, excluding the
* extra padding on the ledge.
*/
int
sms_marker_overlap(win_T *wp, int extra2)
{
if (extra2 == -1)
extra2 = win_col_off(wp) - win_col_off2(wp);
#if defined(FEAT_LINEBREAK)
// There is no marker overlap when in showbreak mode, thus no need to
// account for it. See wlv_screen_line().
if (*get_showbreak_value(wp) != NUL)
return 0;
#endif
// Overlap when 'list' and 'listchars' "precedes" are set is 1.
if (wp->w_p_list && wp->w_lcs_chars.prec)
return 1;
return extra2 > 3 ? 0 : 3 - extra2;
}
/*
* Calculates the skipcol offset for window "wp" given how many
* physical lines we want to scroll down.
*/
static int
skipcol_from_plines(win_T *wp, int plines_off)
{
int width1 = wp->w_width - win_col_off(wp);
int skipcol = 0;
if (plines_off > 0)
skipcol += width1;
if (plines_off > 1)
skipcol += (width1 + win_col_off2(wp)) * (plines_off - 1);
return skipcol;
}
/*
* Set curwin->w_skipcol to zero and redraw later if needed.
*/
static void
reset_skipcol(void)
{
if (curwin->w_skipcol == 0)
return;
curwin->w_skipcol = 0;
// Should use the least expensive way that displays all that changed.
// UPD_NOT_VALID is too expensive, UPD_REDRAW_TOP does not redraw
// enough when the top line gets another screen line.
redraw_later(UPD_SOME_VALID);
}
/*
* Update curwin->w_topline and redraw if necessary.
* Used to update the screen before printing a message.
*/
void
update_topline_redraw(void)
{
update_topline();
if (must_redraw)
update_screen(0);
}
/*
* Update curwin->w_topline to move the cursor onto the screen.
*/
void
update_topline(void)
{
long line_count;
int halfheight;
int n;
#ifdef FEAT_FOLDING
linenr_T lnum;
#endif
int check_topline = FALSE;
int check_botline = FALSE;
long *so_ptr = curwin->w_p_so >= 0 ? &curwin->w_p_so : &p_so;
int save_so = *so_ptr;
// Cursor is updated instead when this is TRUE for 'splitkeep'.
if (skip_update_topline)
return;
// If there is no valid screen and when the window height is zero just use
// the cursor line.
if (!screen_valid(TRUE) || curwin->w_height == 0)
{
check_cursor_lnum();
curwin->w_topline = curwin->w_cursor.lnum;
curwin->w_botline = curwin->w_topline;
curwin->w_scbind_pos = 1;
return;
}
check_cursor_moved(curwin);
if (curwin->w_valid & VALID_TOPLINE)
return;
// When dragging with the mouse, don't scroll that quickly
if (mouse_dragging > 0)
*so_ptr = mouse_dragging - 1;
linenr_T old_topline = curwin->w_topline;
#ifdef FEAT_DIFF
int old_topfill = curwin->w_topfill;
#endif
/*
* If the buffer is empty, always set topline to 1.
*/
if (BUFEMPTY()) // special case - file is empty
{
if (curwin->w_topline != 1)
redraw_later(UPD_NOT_VALID);
curwin->w_topline = 1;
curwin->w_botline = 2;
curwin->w_skipcol = 0;
curwin->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP;
curwin->w_scbind_pos = 1;
}
/*
* If the cursor is above or near the top of the window, scroll the window
* to show the line the cursor is in, with 'scrolloff' context.
*/
else
{
if (curwin->w_topline > 1 || curwin->w_skipcol > 0)
{
// If the cursor is above topline, scrolling is always needed.
// If the cursor is far below topline and there is no folding,
// scrolling down is never needed.
if (curwin->w_cursor.lnum < curwin->w_topline)
check_topline = TRUE;
else if (check_top_offset())
check_topline = TRUE;
else if (curwin->w_skipcol > 0
&& curwin->w_cursor.lnum == curwin->w_topline)
{
colnr_T vcol;
int overlap;
// Check that the cursor position is visible. Add columns for
// the marker displayed in the top-left if needed.
getvvcol(curwin, &curwin->w_cursor, &vcol, NULL, NULL);
overlap = sms_marker_overlap(curwin, -1);
if (curwin->w_skipcol + overlap > vcol)
check_topline = TRUE;
}
}
#ifdef FEAT_DIFF
// Check if there are more filler lines than allowed.
if (!check_topline && curwin->w_topfill > diff_check_fill(curwin,
curwin->w_topline))
check_topline = TRUE;
#endif
if (check_topline)
{
halfheight = curwin->w_height / 2 - 1;
if (halfheight < 2)
halfheight = 2;
#ifdef FEAT_FOLDING
if (hasAnyFolding(curwin))
{
// Count the number of logical lines between the cursor and
// topline + scrolloff (approximation of how much will be
// scrolled).
n = 0;
for (lnum = curwin->w_cursor.lnum;
lnum < curwin->w_topline + *so_ptr; ++lnum)
{
++n;
// stop at end of file or when we know we are far off
if (lnum >= curbuf->b_ml.ml_line_count || n >= halfheight)
break;
(void)hasFolding(lnum, NULL, &lnum);
}
}
else
#endif
n = curwin->w_topline + *so_ptr - curwin->w_cursor.lnum;
// If we weren't very close to begin with, we scroll to put the
// cursor in the middle of the window. Otherwise put the cursor
// near the top of the window.
if (n >= halfheight)
scroll_cursor_halfway(FALSE, FALSE);
else
{
scroll_cursor_top(scrolljump_value(), FALSE);
check_botline = TRUE;
}
}
else
{
#ifdef FEAT_FOLDING
// Make sure topline is the first line of a fold.
(void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL);
#endif
check_botline = TRUE;
}
}
/*
* If the cursor is below the bottom of the window, scroll the window
* to put the cursor on the window.
* When w_botline is invalid, recompute it first, to avoid a redraw later.
* If w_botline was approximated, we might need a redraw later in a few
* cases, but we don't want to spend (a lot of) time recomputing w_botline
* for every small change.
*/
if (check_botline)
{
if (!(curwin->w_valid & VALID_BOTLINE_AP))
validate_botline();
if (curwin->w_botline <= curbuf->b_ml.ml_line_count)
{
if (curwin->w_cursor.lnum < curwin->w_botline)
{
if (((long)curwin->w_cursor.lnum
>= (long)curwin->w_botline - *so_ptr
#ifdef FEAT_FOLDING
|| hasAnyFolding(curwin)
#endif
))
{
lineoff_T loff;
// Cursor is (a few lines) above botline, check if there are
// 'scrolloff' window lines below the cursor. If not, need to
// scroll.
n = curwin->w_empty_rows;
loff.lnum = curwin->w_cursor.lnum;
#ifdef FEAT_FOLDING
// In a fold go to its last line.
(void)hasFolding(loff.lnum, NULL, &loff.lnum);
#endif
#ifdef FEAT_DIFF
loff.fill = 0;
n += curwin->w_filler_rows;
#endif
loff.height = 0;
while (loff.lnum < curwin->w_botline
#ifdef FEAT_DIFF
&& (loff.lnum + 1 < curwin->w_botline || loff.fill == 0)
#endif
)
{
n += loff.height;
if (n >= *so_ptr)
break;
botline_forw(&loff);
}
if (n >= *so_ptr)
// sufficient context, no need to scroll
check_botline = FALSE;
}
else
// sufficient context, no need to scroll
check_botline = FALSE;
}
if (check_botline)
{
#ifdef FEAT_FOLDING
if (hasAnyFolding(curwin))
{
// Count the number of logical lines between the cursor and
// botline - scrolloff (approximation of how much will be
// scrolled).
line_count = 0;
for (lnum = curwin->w_cursor.lnum;
lnum >= curwin->w_botline - *so_ptr; --lnum)
{
++line_count;
// stop at end of file or when we know we are far off
if (lnum <= 0 || line_count > curwin->w_height + 1)
break;
(void)hasFolding(lnum, &lnum, NULL);
}
}
else
#endif
line_count = curwin->w_cursor.lnum - curwin->w_botline
+ 1 + *so_ptr;
if (line_count <= curwin->w_height + 1)
scroll_cursor_bot(scrolljump_value(), FALSE);
else
scroll_cursor_halfway(FALSE, FALSE);
}
}
}
curwin->w_valid |= VALID_TOPLINE;
/*
* Need to redraw when topline changed.
*/
if (curwin->w_topline != old_topline
#ifdef FEAT_DIFF
|| curwin->w_topfill != old_topfill
#endif
)
{
dollar_vcol = -1;
redraw_later(UPD_VALID);
// When 'smoothscroll' is not set, should reset w_skipcol.
if (!curwin->w_p_sms)
reset_skipcol();
else if (curwin->w_skipcol != 0)
redraw_later(UPD_SOME_VALID);
// May need to set w_skipcol when cursor in w_topline.
if (curwin->w_cursor.lnum == curwin->w_topline)
validate_cursor();
}
*so_ptr = save_so;
}
/*
* Return the scrolljump value to use for the current window.
* When 'scrolljump' is positive use it as-is.
* When 'scrolljump' is negative use it as a percentage of the window height.
*/
static int
scrolljump_value(void)
{
if (p_sj >= 0)
return (int)p_sj;
return (curwin->w_height * -p_sj) / 100;
}
/*
* Return TRUE when there are not 'scrolloff' lines above the cursor for the
* current window.
*/
static int
check_top_offset(void)
{
lineoff_T loff;
int n;
long so = get_scrolloff_value();
if (curwin->w_cursor.lnum < curwin->w_topline + so
#ifdef FEAT_FOLDING
|| hasAnyFolding(curwin)
#endif
)
{
loff.lnum = curwin->w_cursor.lnum;
#ifdef FEAT_DIFF
loff.fill = 0;
n = curwin->w_topfill; // always have this context
#else
n = 0;
#endif
// Count the visible screen lines above the cursor line.
while (n < so)
{
topline_back(&loff);
// Stop when included a line above the window.
if (loff.lnum < curwin->w_topline
#ifdef FEAT_DIFF
|| (loff.lnum == curwin->w_topline && loff.fill > 0)
#endif
)
break;
n += loff.height;
}
if (n < so)
return TRUE;
}
return FALSE;
}
/*
* Update w_curswant.
*/
void
update_curswant_force(void)
{
validate_virtcol();
curwin->w_curswant = curwin->w_virtcol
#ifdef FEAT_PROP_POPUP
- curwin->w_virtcol_first_char
#endif
;
curwin->w_set_curswant = FALSE;
}
/*
* Update w_curswant if w_set_curswant is set.
*/
void
update_curswant(void)
{
if (curwin->w_set_curswant)
update_curswant_force();
}
/*
* Check if the cursor has moved. Set the w_valid flag accordingly.
*/
void
check_cursor_moved(win_T *wp)
{
if (wp->w_cursor.lnum != wp->w_valid_cursor.lnum)
{
wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL
|VALID_CHEIGHT|VALID_CROW|VALID_TOPLINE
|VALID_BOTLINE|VALID_BOTLINE_AP);
wp->w_valid_cursor = wp->w_cursor;
wp->w_valid_leftcol = wp->w_leftcol;
wp->w_valid_skipcol = wp->w_skipcol;
}
else if (wp->w_skipcol != wp->w_valid_skipcol)
{
wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL
|VALID_CHEIGHT|VALID_CROW
|VALID_BOTLINE|VALID_BOTLINE_AP);
wp->w_valid_cursor = wp->w_cursor;
wp->w_valid_leftcol = wp->w_leftcol;
wp->w_valid_skipcol = wp->w_skipcol;
}
else if (wp->w_cursor.col != wp->w_valid_cursor.col
|| wp->w_leftcol != wp->w_valid_leftcol
|| wp->w_cursor.coladd != wp->w_valid_cursor.coladd)
{
wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL);
wp->w_valid_cursor.col = wp->w_cursor.col;
wp->w_valid_leftcol = wp->w_leftcol;
wp->w_valid_cursor.coladd = wp->w_cursor.coladd;
}
}
/*
* Call this function when some window settings have changed, which require
* the cursor position, botline and topline to be recomputed and the window to
* be redrawn. E.g, when changing the 'wrap' option or folding.
*/
void
changed_window_setting(void)
{
changed_window_setting_win(curwin);
}
void
changed_window_setting_win(win_T *wp)
{
wp->w_lines_valid = 0;
changed_line_abv_curs_win(wp);
wp->w_valid &= ~(VALID_BOTLINE|VALID_BOTLINE_AP|VALID_TOPLINE);
redraw_win_later(wp, UPD_NOT_VALID);
}
#if defined(FEAT_PROP_POPUP) || defined(PROTO)
/*
* Call changed_window_setting_win() for every window containing "buf".
*/
void
changed_window_setting_buf(buf_T *buf)
{
tabpage_T *tp;
win_T *wp;
FOR_ALL_TAB_WINDOWS(tp, wp)
if (wp->w_buffer == buf)
changed_window_setting_win(wp);
}
#endif
/*
* Call changed_window_setting_win() for every window.
*/
void
changed_window_setting_all(void)
{
tabpage_T *tp;
win_T *wp;
FOR_ALL_TAB_WINDOWS(tp, wp)
changed_window_setting_win(wp);
}
/*
* Set wp->w_topline to a certain number.
*/
void
set_topline(win_T *wp, linenr_T lnum)
{
#ifdef FEAT_DIFF
linenr_T prev_topline = wp->w_topline;
#endif
#ifdef FEAT_FOLDING
// go to first of folded lines
(void)hasFoldingWin(wp, lnum, &lnum, NULL, TRUE, NULL);
#endif
// Approximate the value of w_botline
wp->w_botline += lnum - wp->w_topline;
if (wp->w_botline > wp->w_buffer->b_ml.ml_line_count + 1)
wp->w_botline = wp->w_buffer->b_ml.ml_line_count + 1;
wp->w_topline = lnum;
wp->w_topline_was_set = TRUE;
#ifdef FEAT_DIFF
if (lnum != prev_topline)
// Keep the filler lines when the topline didn't change.
wp->w_topfill = 0;
#endif
wp->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE|VALID_TOPLINE);
// Don't set VALID_TOPLINE here, 'scrolloff' needs to be checked.
redraw_later(UPD_VALID);
}
/*
* Call this function when the length of the cursor line (in screen
* characters) has changed, and the change is before the cursor.
* If the line length changed the number of screen lines might change,
* requiring updating w_topline. That may also invalidate w_crow.
* Need to take care of w_botline separately!
*/
void
changed_cline_bef_curs(void)
{
curwin->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL|VALID_CROW
|VALID_CHEIGHT|VALID_TOPLINE);
}
void
changed_cline_bef_curs_win(win_T *wp)
{
wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL|VALID_CROW
|VALID_CHEIGHT|VALID_TOPLINE);
}
/*
* Call this function when the length of a line (in screen characters) above
* the cursor have changed.
* Need to take care of w_botline separately!
*/
void
changed_line_abv_curs(void)
{
curwin->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL|VALID_CROW
|VALID_CHEIGHT|VALID_TOPLINE);
}
void
changed_line_abv_curs_win(win_T *wp)
{
wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL|VALID_CROW
|VALID_CHEIGHT|VALID_TOPLINE);
}
#if defined(FEAT_PROP_POPUP) || defined(PROTO)
/*
* Display of line has changed for "buf", invalidate cursor position and
* w_botline.
*/
void
changed_line_display_buf(buf_T *buf)
{
win_T *wp;
FOR_ALL_WINDOWS(wp)
if (wp->w_buffer == buf)
wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL
|VALID_CROW|VALID_CHEIGHT
|VALID_TOPLINE|VALID_BOTLINE|VALID_BOTLINE_AP);
}
#endif
/*
* Make sure the value of curwin->w_botline is valid.
*/
void
validate_botline(void)
{
validate_botline_win(curwin);
}
/*
* Make sure the value of wp->w_botline is valid.
*/
void
validate_botline_win(win_T *wp)
{
if (!(wp->w_valid & VALID_BOTLINE))
comp_botline(wp);
}
/*
* Mark curwin->w_botline as invalid (because of some change in the buffer).
*/
void
invalidate_botline(void)
{
curwin->w_valid &= ~(VALID_BOTLINE|VALID_BOTLINE_AP);
}
void
invalidate_botline_win(win_T *wp)
{
wp->w_valid &= ~(VALID_BOTLINE|VALID_BOTLINE_AP);
}
void
approximate_botline_win(
win_T *wp)
{
wp->w_valid &= ~VALID_BOTLINE;
}
/*
* Return TRUE if curwin->w_wrow and curwin->w_wcol are valid.
*/
int
cursor_valid(void)
{
check_cursor_moved(curwin);
return ((curwin->w_valid & (VALID_WROW|VALID_WCOL)) ==
(VALID_WROW|VALID_WCOL));
}
/*
* Validate cursor position. Makes sure w_wrow and w_wcol are valid.
* w_topline must be valid, you may need to call update_topline() first!
*/
void
validate_cursor(void)
{
check_cursor_lnum();
check_cursor_moved(curwin);
if ((curwin->w_valid & (VALID_WCOL|VALID_WROW)) != (VALID_WCOL|VALID_WROW))
curs_columns(TRUE);
}
#if defined(FEAT_GUI) || defined(PROTO)
/*
* validate w_cline_row.
*/
void
validate_cline_row(void)
{
/*
* First make sure that w_topline is valid (after moving the cursor).
*/
update_topline();
check_cursor_moved(curwin);
if (!(curwin->w_valid & VALID_CROW))
curs_rows(curwin);
}
#endif
/*
* Compute wp->w_cline_row and wp->w_cline_height, based on the current value
* of wp->w_topline.
*/
static void
curs_rows(win_T *wp)
{
linenr_T lnum;
int i;
int all_invalid;
int valid;
#ifdef FEAT_FOLDING
long fold_count;
#endif
// Check if wp->w_lines[].wl_size is invalid
all_invalid = (!redrawing()
|| wp->w_lines_valid == 0
|| wp->w_lines[0].wl_lnum > wp->w_topline);
i = 0;
wp->w_cline_row = 0;
for (lnum = wp->w_topline; lnum < wp->w_cursor.lnum; ++i)
{
valid = FALSE;
if (!all_invalid && i < wp->w_lines_valid)
{
if (wp->w_lines[i].wl_lnum < lnum || !wp->w_lines[i].wl_valid)
continue; // skip changed or deleted lines
if (wp->w_lines[i].wl_lnum == lnum)
{
#ifdef FEAT_FOLDING
// Check for newly inserted lines below this row, in which
// case we need to check for folded lines.
if (!wp->w_buffer->b_mod_set
|| wp->w_lines[i].wl_lastlnum < wp->w_cursor.lnum
|| wp->w_buffer->b_mod_top
> wp->w_lines[i].wl_lastlnum + 1)
#endif
valid = TRUE;
}
else if (wp->w_lines[i].wl_lnum > lnum)
--i; // hold at inserted lines
}
if (valid
&& (lnum != wp->w_topline || (wp->w_skipcol == 0
#ifdef FEAT_DIFF
&& !wp->w_p_diff
#endif
)))
{
#ifdef FEAT_FOLDING
lnum = wp->w_lines[i].wl_lastlnum + 1;
// Cursor inside folded lines, don't count this row
if (lnum > wp->w_cursor.lnum)
break;
#else
++lnum;
#endif
wp->w_cline_row += wp->w_lines[i].wl_size;
}
else
{
#ifdef FEAT_FOLDING
fold_count = foldedCount(wp, lnum, NULL);
if (fold_count)
{
lnum += fold_count;
if (lnum > wp->w_cursor.lnum)
break;
++wp->w_cline_row;
}
else
#endif
{
wp->w_cline_row += plines_correct_topline(wp, lnum, TRUE);
++lnum;
}
}
}
check_cursor_moved(wp);
if (!(wp->w_valid & VALID_CHEIGHT))
{
if (all_invalid
|| i == wp->w_lines_valid
|| (i < wp->w_lines_valid
&& (!wp->w_lines[i].wl_valid
|| wp->w_lines[i].wl_lnum != wp->w_cursor.lnum)))
{
#ifdef FEAT_DIFF
if (wp->w_cursor.lnum == wp->w_topline)
wp->w_cline_height = plines_win_nofill(wp, wp->w_cursor.lnum,
TRUE) + wp->w_topfill;
else
#endif
wp->w_cline_height = plines_win(wp, wp->w_cursor.lnum, TRUE);
#ifdef FEAT_FOLDING
wp->w_cline_folded = hasFoldingWin(wp, wp->w_cursor.lnum,
NULL, NULL, TRUE, NULL);
#endif
}
else if (i > wp->w_lines_valid)
{
// a line that is too long to fit on the last screen line
wp->w_cline_height = 0;
#ifdef FEAT_FOLDING
wp->w_cline_folded = hasFoldingWin(wp, wp->w_cursor.lnum,
NULL, NULL, TRUE, NULL);
#endif
}
else
{
wp->w_cline_height = wp->w_lines[i].wl_size;
#ifdef FEAT_FOLDING
wp->w_cline_folded = wp->w_lines[i].wl_folded;
#endif
}
}
redraw_for_cursorline(curwin);
wp->w_valid |= VALID_CROW|VALID_CHEIGHT;
}
/*
* Validate curwin->w_virtcol only.
*/
void
validate_virtcol(void)
{
validate_virtcol_win(curwin);
}
/*
* Validate wp->w_virtcol only.
*/
void
validate_virtcol_win(win_T *wp)
{
check_cursor_moved(wp);
if (wp->w_valid & VALID_VIRTCOL)
return;
#ifdef FEAT_PROP_POPUP
wp->w_virtcol_first_char = 0;
#endif
getvvcol(wp, &wp->w_cursor, NULL, &(wp->w_virtcol), NULL);
#ifdef FEAT_SYN_HL
redraw_for_cursorcolumn(wp);
#endif
wp->w_valid |= VALID_VIRTCOL;
}
/*
* Validate curwin->w_cline_height only.
*/
void
validate_cheight(void)
{
check_cursor_moved(curwin);
if (curwin->w_valid & VALID_CHEIGHT)
return;
#ifdef FEAT_DIFF
if (curwin->w_cursor.lnum == curwin->w_topline)
curwin->w_cline_height = plines_nofill(curwin->w_cursor.lnum)
+ curwin->w_topfill;
else
#endif
curwin->w_cline_height = plines(curwin->w_cursor.lnum);
#ifdef FEAT_FOLDING
curwin->w_cline_folded = hasFolding(curwin->w_cursor.lnum, NULL, NULL);
#endif
curwin->w_valid |= VALID_CHEIGHT;
}
/*
* Validate w_wcol and w_virtcol only.
*/
void
validate_cursor_col(void)
{
colnr_T off;
colnr_T col;
int width;
validate_virtcol();
if (curwin->w_valid & VALID_WCOL)
return;
col = curwin->w_virtcol;
off = curwin_col_off();
col += off;
width = curwin->w_width - off + curwin_col_off2();
// long line wrapping, adjust curwin->w_wrow
if (curwin->w_p_wrap
&& col >= (colnr_T)curwin->w_width
&& width > 0)
// use same formula as what is used in curs_columns()
col -= ((col - curwin->w_width) / width + 1) * width;
if (col > (int)curwin->w_leftcol)
col -= curwin->w_leftcol;
else
col = 0;
curwin->w_wcol = col;
curwin->w_valid |= VALID_WCOL;
#ifdef FEAT_PROP_POPUP
curwin->w_flags &= ~WFLAG_WCOL_OFF_ADDED;
#endif
}
/*
* Compute offset of a window, occupied by absolute or relative line number,
* fold column and sign column (these don't move when scrolling horizontally).
*/
int
win_col_off(win_T *wp)
{
return (((wp->w_p_nu || wp->w_p_rnu) ? number_width(wp) + 1 : 0)
+ (wp != cmdwin_win ? 0 : 1)
#ifdef FEAT_FOLDING
+ wp->w_p_fdc
#endif
#ifdef FEAT_SIGNS
+ (signcolumn_on(wp) ? 2 : 0)
#endif
);
}
int
curwin_col_off(void)
{
return win_col_off(curwin);
}
/*
* Return the difference in column offset for the second screen line of a
* wrapped line. It's positive if 'number' or 'relativenumber' is on and 'n'
* is in 'cpoptions'.
*/
int
win_col_off2(win_T *wp)
{
if ((wp->w_p_nu || wp->w_p_rnu) && vim_strchr(p_cpo, CPO_NUMCOL) != NULL)
return number_width(wp) + 1;
return 0;
}
int
curwin_col_off2(void)
{
return win_col_off2(curwin);
}
/*
* Compute curwin->w_wcol and curwin->w_virtcol.
* Also updates curwin->w_wrow and curwin->w_cline_row.
* Also updates curwin->w_leftcol.
*/
void
curs_columns(
int may_scroll) // when TRUE, may scroll horizontally
{
int diff;
int extra; // offset for first screen line
int off_left, off_right;
int n;
int p_lines;
int width1; // text width for first screen line
int width2 = 0; // text width for second and later screen line
int new_leftcol;
colnr_T startcol;
colnr_T endcol;
colnr_T prev_skipcol;
long so = get_scrolloff_value();
long siso = get_sidescrolloff_value();
int did_sub_skipcol = FALSE;
/*
* First make sure that w_topline is valid (after moving the cursor).
*/
update_topline();
/*
* Next make sure that w_cline_row is valid.
*/
if (!(curwin->w_valid & VALID_CROW))
curs_rows(curwin);
#ifdef FEAT_PROP_POPUP
// will be set by getvvcol() but not reset
curwin->w_virtcol_first_char = 0;
#endif
/*
* Compute the number of virtual columns.
*/
#ifdef FEAT_FOLDING
if (curwin->w_cline_folded)
// In a folded line the cursor is always in the first column
startcol = curwin->w_virtcol = endcol = curwin->w_leftcol;
else
#endif
getvvcol(curwin, &curwin->w_cursor,
&startcol, &(curwin->w_virtcol), &endcol);
// remove '$' from change command when cursor moves onto it
if (startcol > dollar_vcol)
dollar_vcol = -1;
extra = curwin_col_off();
curwin->w_wcol = curwin->w_virtcol + extra;
endcol += extra;
/*
* Now compute w_wrow, counting screen lines from w_cline_row.
*/
curwin->w_wrow = curwin->w_cline_row;
width1 = curwin->w_width - extra;
if (width1 <= 0)
{
// No room for text, put cursor in last char of window.
// If not wrapping, the last non-empty line.
curwin->w_wcol = curwin->w_width - 1;
if (curwin->w_p_wrap)
curwin->w_wrow = curwin->w_height - 1;
else
curwin->w_wrow = curwin->w_height - 1 - curwin->w_empty_rows;
}
else if (curwin->w_p_wrap && curwin->w_width != 0)
{
width2 = width1 + curwin_col_off2();
// skip columns that are not visible
if (curwin->w_cursor.lnum == curwin->w_topline
&& curwin->w_skipcol > 0
&& curwin->w_wcol >= curwin->w_skipcol)
{
// Deduct by multiples of width2. This allows the long line
// wrapping formula below to correctly calculate the w_wcol value
// when wrapping.
if (curwin->w_skipcol <= width1)
curwin->w_wcol -= width2;
else
curwin->w_wcol -= width2
* (((curwin->w_skipcol - width1) / width2) + 1);
did_sub_skipcol = TRUE;
}
// long line wrapping, adjust curwin->w_wrow
if (curwin->w_wcol >= curwin->w_width)
{
// this same formula is used in validate_cursor_col()
n = (curwin->w_wcol - curwin->w_width) / width2 + 1;
curwin->w_wcol -= n * width2;
curwin->w_wrow += n;
}
}
// No line wrapping: compute curwin->w_leftcol if scrolling is on and line
// is not folded.
// If scrolling is off, curwin->w_leftcol is assumed to be 0
else if (may_scroll
#ifdef FEAT_FOLDING
&& !curwin->w_cline_folded
#endif
)
{
#ifdef FEAT_PROP_POPUP
if (curwin->w_virtcol_first_char > 0)
{
int cols = (curwin->w_width - extra);
int rows = cols > 0 ? curwin->w_virtcol_first_char / cols : 1;
// each "above" text prop shifts the text one row down
curwin->w_wrow += rows;
curwin->w_wcol -= rows * cols;
endcol -= rows * cols;
curwin->w_cline_height = rows + 1;
}
#endif
/*
* If Cursor is left of the screen, scroll rightwards.
* If Cursor is right of the screen, scroll leftwards
* If we get closer to the edge than 'sidescrolloff', scroll a little
* extra
*/
off_left = (int)startcol - (int)curwin->w_leftcol - siso;
off_right = (int)endcol - (int)(curwin->w_leftcol + curwin->w_width
- siso) + 1;
if (off_left < 0 || off_right > 0)
{
if (off_left < 0)
diff = -off_left;
else
diff = off_right;
// When far off or not enough room on either side, put cursor in
// middle of window.
if (p_ss == 0 || diff >= width1 / 2 || off_right >= off_left)
new_leftcol = curwin->w_wcol - extra - width1 / 2;
else
{
if (diff < p_ss)
diff = p_ss;
if (off_left < 0)
new_leftcol = curwin->w_leftcol - diff;
else
new_leftcol = curwin->w_leftcol + diff;
}
if (new_leftcol < 0)
new_leftcol = 0;
if (new_leftcol != (int)curwin->w_leftcol)
{
curwin->w_leftcol = new_leftcol;
// screen has to be redrawn with new curwin->w_leftcol
redraw_later(UPD_NOT_VALID);
}
}
curwin->w_wcol -= curwin->w_leftcol;
}
else if (curwin->w_wcol > (int)curwin->w_leftcol)
curwin->w_wcol -= curwin->w_leftcol;
else
curwin->w_wcol = 0;
#ifdef FEAT_DIFF
// Skip over filler lines. At the top use w_topfill, there
// may be some filler lines above the window.
if (curwin->w_cursor.lnum == curwin->w_topline)
curwin->w_wrow += curwin->w_topfill;
else
curwin->w_wrow += diff_check_fill(curwin, curwin->w_cursor.lnum);
#endif
prev_skipcol = curwin->w_skipcol;
p_lines = 0;
if ((curwin->w_wrow >= curwin->w_height
|| ((prev_skipcol > 0
|| curwin->w_wrow + so >= curwin->w_height)
&& (p_lines =
#ifdef FEAT_DIFF
plines_win_nofill
#else
plines_win
#endif
(curwin, curwin->w_cursor.lnum, FALSE))
- 1 >= curwin->w_height))
&& curwin->w_height != 0
&& curwin->w_cursor.lnum == curwin->w_topline
&& width2 > 0
&& curwin->w_width != 0)
{
// Cursor past end of screen. Happens with a single line that does
// not fit on screen. Find a skipcol to show the text around the
// cursor. Avoid scrolling all the time. compute value of "extra":
// 1: Less than 'scrolloff' lines above
// 2: Less than 'scrolloff' lines below
// 3: both of them
extra = 0;
if (curwin->w_skipcol + so * width2 > curwin->w_virtcol)
extra = 1;
// Compute last display line of the buffer line that we want at the
// bottom of the window.
if (p_lines == 0)
p_lines = plines_win(curwin, curwin->w_cursor.lnum, FALSE);
--p_lines;
if (p_lines > curwin->w_wrow + so)
n = curwin->w_wrow + so;
else
n = p_lines;
if ((colnr_T)n >= curwin->w_height + curwin->w_skipcol / width2 - so)
extra += 2;
if (extra == 3 || curwin->w_height <= so * 2)
{
// not enough room for 'scrolloff', put cursor in the middle
n = curwin->w_virtcol / width2;
if (n > curwin->w_height / 2)
n -= curwin->w_height / 2;
else
n = 0;
// don't skip more than necessary
if (n > p_lines - curwin->w_height + 1)
n = p_lines - curwin->w_height + 1;
if (n > 0)
curwin->w_skipcol = width1 + (n - 1) * width2;
else
curwin->w_skipcol = 0;
}
else if (extra == 1)
{
// less than 'scrolloff' lines above, decrease skipcol
extra = (curwin->w_skipcol + so * width2 - curwin->w_virtcol
+ width2 - 1) / width2;
if (extra > 0)
{
if ((colnr_T)(extra * width2) > curwin->w_skipcol)
extra = curwin->w_skipcol / width2;
curwin->w_skipcol -= extra * width2;
}
}
else if (extra == 2)
{
// less than 'scrolloff' lines below, increase skipcol
endcol = (n - curwin->w_height + 1) * width2;
while (endcol > curwin->w_virtcol)
endcol -= width2;
if (endcol > curwin->w_skipcol)
curwin->w_skipcol = endcol;
}
// adjust w_wrow for the changed w_skipcol
if (did_sub_skipcol)
curwin->w_wrow -= (curwin->w_skipcol - prev_skipcol) / width2;
else
curwin->w_wrow -= curwin->w_skipcol / width2;
if (curwin->w_wrow >= curwin->w_height)
{
// small window, make sure cursor is in it
extra = curwin->w_wrow - curwin->w_height + 1;
curwin->w_skipcol += extra * width2;
curwin->w_wrow -= extra;
}
extra = ((int)prev_skipcol - (int)curwin->w_skipcol) / width2;
if (extra > 0)
win_ins_lines(curwin, 0, extra, FALSE, FALSE);
else if (extra < 0)
win_del_lines(curwin, 0, -extra, FALSE, FALSE, 0);
}
else if (!curwin->w_p_sms)
curwin->w_skipcol = 0;
if (prev_skipcol != curwin->w_skipcol)
redraw_later(UPD_SOME_VALID);
#ifdef FEAT_SYN_HL
redraw_for_cursorcolumn(curwin);
#endif
#if defined(FEAT_PROP_POPUP) && defined(FEAT_TERMINAL)
if (popup_is_popup(curwin) && curbuf->b_term != NULL)
{
curwin->w_wrow += popup_top_extra(curwin);
curwin->w_wcol += popup_left_extra(curwin);
curwin->w_flags |= WFLAG_WCOL_OFF_ADDED + WFLAG_WROW_OFF_ADDED;
}
else
curwin->w_flags &= ~(WFLAG_WCOL_OFF_ADDED + WFLAG_WROW_OFF_ADDED);
#endif
// now w_leftcol and w_skipcol are valid, avoid check_cursor_moved()
// thinking otherwise
curwin->w_valid_leftcol = curwin->w_leftcol;
curwin->w_valid_skipcol = curwin->w_skipcol;
curwin->w_valid |= VALID_WCOL|VALID_WROW|VALID_VIRTCOL;
}
#if (defined(FEAT_EVAL) || defined(FEAT_PROP_POPUP)) || defined(PROTO)
/*
* Compute the screen position of text character at "pos" in window "wp"
* The resulting values are one-based, zero when character is not visible.
*/
void
textpos2screenpos(
win_T *wp,
pos_T *pos,
int *rowp, // screen row
int *scolp, // start screen column
int *ccolp, // cursor screen column
int *ecolp) // end screen column
{
colnr_T scol = 0, ccol = 0, ecol = 0;
int row = 0;
colnr_T coloff = 0;
if (pos->lnum >= wp->w_topline && pos->lnum <= wp->w_botline)
{
colnr_T col;
int width;
linenr_T lnum = pos->lnum;
#ifdef FEAT_FOLDING
int is_folded;
is_folded = hasFoldingWin(wp, lnum, &lnum, NULL, TRUE, NULL);
#endif
row = plines_m_win(wp, wp->w_topline, lnum - 1, INT_MAX);
// "row" should be the screen line where line "lnum" begins, which can
// be negative if "lnum" is "w_topline" and "w_skipcol" is non-zero.
row -= adjust_plines_for_skipcol(wp);
#ifdef FEAT_DIFF
// Add filler lines above this buffer line.
row += lnum == wp->w_topline ? wp->w_topfill
: diff_check_fill(wp, lnum);
#endif
colnr_T off = win_col_off(wp);
#ifdef FEAT_FOLDING
if (is_folded)
{
row += W_WINROW(wp) + 1;
coloff = wp->w_wincol + 1 + off;
}
else
#endif
{
getvcol(wp, pos, &scol, &ccol, &ecol);
// similar to what is done in validate_cursor_col()
col = scol;
col += off;
width = wp->w_width - off + win_col_off2(wp);
// long line wrapping, adjust row
if (wp->w_p_wrap
&& col >= (colnr_T)wp->w_width
&& width > 0)
{
// use same formula as what is used in curs_columns()
int rowoff = ((col - wp->w_width) / width + 1);
col -= rowoff * width;
row += rowoff;
}
col -= wp->w_leftcol;
if (col >= wp->w_width)
col = -1;
if (col >= 0 && row >= 0 && row < wp->w_height)
{
coloff = col - scol + wp->w_wincol + 1;
row += W_WINROW(wp) + 1;
}
else
// character is out of the window
row = scol = ccol = ecol = 0;
}
}
*rowp = row;
*scolp = scol + coloff;
*ccolp = ccol + coloff;
*ecolp = ecol + coloff;
}
#endif
#if defined(FEAT_EVAL) || defined(PROTO)
/*
* "screenpos({winid}, {lnum}, {col})" function
*/
void
f_screenpos(typval_T *argvars UNUSED, typval_T *rettv)
{
dict_T *dict;
win_T *wp;
pos_T pos;
int row = 0;
int scol = 0, ccol = 0, ecol = 0;
if (rettv_dict_alloc(rettv) == FAIL)
return;
dict = rettv->vval.v_dict;
if (in_vim9script()
&& (check_for_number_arg(argvars, 0) == FAIL
|| check_for_number_arg(argvars, 1) == FAIL
|| check_for_number_arg(argvars, 2) == FAIL))
return;
wp = find_win_by_nr_or_id(&argvars[0]);
if (wp == NULL)
return;
pos.lnum = tv_get_number(&argvars[1]);
if (pos.lnum > wp->w_buffer->b_ml.ml_line_count)
{
semsg(_(e_invalid_line_number_nr), pos.lnum);
return;
}
pos.col = tv_get_number(&argvars[2]) - 1;
if (pos.col < 0)
pos.col = 0;
pos.coladd = 0;
textpos2screenpos(wp, &pos, &row, &scol, &ccol, &ecol);
dict_add_number(dict, "row", row);
dict_add_number(dict, "col", scol);
dict_add_number(dict, "curscol", ccol);
dict_add_number(dict, "endcol", ecol);
}
/*
* Convert a virtual (screen) column to a character column. The first column
* is one. For a multibyte character, the column number of the first byte is
* returned.
*/
static int
virtcol2col(win_T *wp, linenr_T lnum, int vcol)
{
int offset = vcol2col(wp, lnum, vcol - 1, NULL);
char_u *line = ml_get_buf(wp->w_buffer, lnum, FALSE);
char_u *p = line + offset;
if (*p == NUL)
{
if (p == line) // empty line
return 0;
// Move to the first byte of the last char.
MB_PTR_BACK(line, p);
}
return (int)(p - line + 1);
}
/*
* "virtcol2col({winid}, {lnum}, {col})" function
*/
void
f_virtcol2col(typval_T *argvars UNUSED, typval_T *rettv)
{
win_T *wp;
linenr_T lnum;
int screencol;
int error = FALSE;
rettv->vval.v_number = -1;
if (check_for_number_arg(argvars, 0) == FAIL
|| check_for_number_arg(argvars, 1) == FAIL
|| check_for_number_arg(argvars, 2) == FAIL)
return;
wp = find_win_by_nr_or_id(&argvars[0]);
if (wp == NULL)
return;
lnum = tv_get_number_chk(&argvars[1], &error);
if (error || lnum < 0 || lnum > wp->w_buffer->b_ml.ml_line_count)
return;
screencol = tv_get_number_chk(&argvars[2], &error);
if (error || screencol < 0)
return;
rettv->vval.v_number = virtcol2col(wp, lnum, screencol);
}
#endif
/*
* Make sure the cursor is in the visible part of the topline after scrolling
* the screen with 'smoothscroll'.
*/
static void cursor_correct_sms(void)
{
if (!curwin->w_p_sms || !curwin->w_p_wrap
|| curwin->w_cursor.lnum != curwin->w_topline)
return;
long so = get_scrolloff_value();
int width1 = curwin->w_width - curwin_col_off();
int width2 = width1 + curwin_col_off2();
int so_cols = so == 0 ? 0 : width1 + (so - 1) * width2;
int space_cols = (curwin->w_height - 1) * width2;
int overlap, top, bot;
int size = so == 0 ? 0 : linetabsize_eol(curwin, curwin->w_topline);
if (curwin->w_topline == 1 && curwin->w_skipcol == 0)
so_cols = 0; // Ignore 'scrolloff' at top of buffer.
else if (so_cols > space_cols / 2)
so_cols = space_cols / 2; // Not enough room: put cursor in the middle.
// Not enough screen lines in topline: ignore 'scrolloff'.
while (so_cols > size && so_cols - width2 >= width1 && width1 > 0)
so_cols -= width2;
if (so_cols >= width1 && so_cols > size)
so_cols -= width1;
overlap = curwin->w_skipcol == 0 ? 0
: sms_marker_overlap(curwin, curwin->w_width - width2);
// If we have non-zero scrolloff, ignore marker overlap.
top = curwin->w_skipcol + (so_cols != 0 ? so_cols : overlap);
bot = curwin->w_skipcol + width1 + (curwin->w_height - 1) * width2
- so_cols;
validate_virtcol();
colnr_T col = curwin->w_virtcol;
if (col < top)
{
if (col < width1)
col += width1;
while (width2 > 0 && col < top)
col += width2;
}
else
while (width2 > 0 && col >= bot)
col -= width2;
if (col != curwin->w_virtcol)
{
int rc;
curwin->w_curswant = col;
rc = coladvance(curwin->w_curswant);
// validate_virtcol() marked various things as valid, but after
// moving the cursor they need to be recomputed
curwin->w_valid &=
~(VALID_WROW|VALID_WCOL|VALID_CHEIGHT|VALID_CROW|VALID_VIRTCOL);
if (rc == FAIL && curwin->w_skipcol > 0
&& curwin->w_cursor.lnum < curbuf->b_ml.ml_line_count)
{
validate_virtcol();
if (curwin->w_virtcol < curwin->w_skipcol + overlap)
{
// Cursor still not visible: move it to the next line instead.
curwin->w_cursor.lnum++;
curwin->w_cursor.col = 0;
curwin->w_cursor.coladd = 0;
curwin->w_curswant = 0;
curwin->w_valid &= ~VALID_VIRTCOL;
}
}
}
}
/*
* Scroll "count" lines up or down, and redraw.
*/
void
scroll_redraw(int up, long count)
{
linenr_T prev_topline = curwin->w_topline;
int prev_skipcol = curwin->w_skipcol;
#ifdef FEAT_DIFF
int prev_topfill = curwin->w_topfill;
#endif
linenr_T prev_lnum = curwin->w_cursor.lnum;
if (up)
scrollup(count, TRUE);
else
scrolldown(count, TRUE);
if (get_scrolloff_value() > 0)
{
// Adjust the cursor position for 'scrolloff'. Mark w_topline as
// valid, otherwise the screen jumps back at the end of the file.
cursor_correct();
check_cursor_moved(curwin);
curwin->w_valid |= VALID_TOPLINE;
// If moved back to where we were, at least move the cursor, otherwise
// we get stuck at one position. Don't move the cursor up if the
// first line of the buffer is already on the screen
while (curwin->w_topline == prev_topline
&& curwin->w_skipcol == prev_skipcol
#ifdef FEAT_DIFF
&& curwin->w_topfill == prev_topfill
#endif
)
{
if (up)
{
if (curwin->w_cursor.lnum > prev_lnum
|| cursor_down(1L, FALSE) == FAIL)
break;
}
else
{
if (curwin->w_cursor.lnum < prev_lnum
|| prev_topline == 1L
|| cursor_up(1L, FALSE) == FAIL)
break;
}
// Mark w_topline as valid, otherwise the screen jumps back at the
// end of the file.
check_cursor_moved(curwin);
curwin->w_valid |= VALID_TOPLINE;
}
}
cursor_correct_sms();
if (curwin->w_cursor.lnum != prev_lnum)
coladvance(curwin->w_curswant);
redraw_later(UPD_VALID);
}
/*
* Scroll the current window down by "line_count" logical lines. "CTRL-Y"
*/
void
scrolldown(
long line_count,
int byfold UNUSED) // TRUE: count a closed fold as one line
{
long done = 0; // total # of physical lines done
int wrow;
int moved = FALSE;
int do_sms = curwin->w_p_wrap && curwin->w_p_sms;
int width1 = 0;
int width2 = 0;
if (do_sms)
{
width1 = curwin->w_width - curwin_col_off();
width2 = width1 + curwin_col_off2();
}
#ifdef FEAT_FOLDING
linenr_T first;
// Make sure w_topline is at the first of a sequence of folded lines.
(void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL);
#endif
validate_cursor(); // w_wrow needs to be valid
for (int todo = line_count; todo > 0; --todo)
{
#ifdef FEAT_DIFF
if (curwin->w_topfill < diff_check(curwin, curwin->w_topline)
&& curwin->w_topfill < curwin->w_height - 1)
{
++curwin->w_topfill;
++done;
}
else
#endif
{
// break when at the very top
if (curwin->w_topline == 1
&& (!do_sms || curwin->w_skipcol < width1))
break;
if (do_sms && curwin->w_skipcol >= width1)
{
// scroll a screen line down
if (curwin->w_skipcol >= width1 + width2)
curwin->w_skipcol -= width2;
else
curwin->w_skipcol -= width1;
redraw_later(UPD_NOT_VALID);
++done;
}
else
{
// scroll a text line down
--curwin->w_topline;
curwin->w_skipcol = 0;
#ifdef FEAT_DIFF
curwin->w_topfill = 0;
#endif
#ifdef FEAT_FOLDING
// A sequence of folded lines only counts for one logical line
if (hasFolding(curwin->w_topline, &first, NULL))
{
++done;
if (!byfold)
todo -= curwin->w_topline - first - 1;
curwin->w_botline -= curwin->w_topline - first;
curwin->w_topline = first;
}
else
#endif
if (do_sms)
{
int size = linetabsize_eol(curwin, curwin->w_topline);
if (size > width1)
{
curwin->w_skipcol = width1;
size -= width1;
redraw_later(UPD_NOT_VALID);
}
while (size > width2)
{
curwin->w_skipcol += width2;
size -= width2;
}
++done;
}
else
done += PLINES_NOFILL(curwin->w_topline);
}
}
--curwin->w_botline; // approximate w_botline
invalidate_botline();
}
curwin->w_wrow += done; // keep w_wrow updated
curwin->w_cline_row += done; // keep w_cline_row updated
#ifdef FEAT_DIFF
if (curwin->w_cursor.lnum == curwin->w_topline)
curwin->w_cline_row = 0;
check_topfill(curwin, TRUE);
#endif
/*
* Compute the row number of the last row of the cursor line
* and move the cursor onto the displayed part of the window.
*/
wrow = curwin->w_wrow;
if (curwin->w_p_wrap && curwin->w_width != 0)
{
validate_virtcol();
validate_cheight();
wrow += curwin->w_cline_height - 1 -
curwin->w_virtcol / curwin->w_width;
}
while (wrow >= curwin->w_height && curwin->w_cursor.lnum > 1)
{
#ifdef FEAT_FOLDING
if (hasFolding(curwin->w_cursor.lnum, &first, NULL))
{
--wrow;
if (first == 1)
curwin->w_cursor.lnum = 1;
else
curwin->w_cursor.lnum = first - 1;
}
else
#endif
wrow -= plines(curwin->w_cursor.lnum--);
curwin->w_valid &=
~(VALID_WROW|VALID_WCOL|VALID_CHEIGHT|VALID_CROW|VALID_VIRTCOL);
moved = TRUE;
}
if (moved)
{
#ifdef FEAT_FOLDING
// Move cursor to first line of closed fold.
foldAdjustCursor();
#endif
coladvance(curwin->w_curswant);
}
if (curwin->w_cursor.lnum < curwin->w_topline)
curwin->w_cursor.lnum = curwin->w_topline;
}
/*
* Scroll the current window up by "line_count" logical lines. "CTRL-E"
*/
void
scrollup(
long line_count,
int byfold UNUSED) // TRUE: count a closed fold as one line
{
int do_sms = curwin->w_p_wrap && curwin->w_p_sms;
if (do_sms
# ifdef FEAT_FOLDING
|| (byfold && hasAnyFolding(curwin))
# endif
# ifdef FEAT_DIFF
|| (curwin->w_p_diff && !curwin->w_p_wrap)
# endif
)
{
int width1 = curwin->w_width - curwin_col_off();
int width2 = width1 + curwin_col_off2();
int size = 0;
colnr_T prev_skipcol = curwin->w_skipcol;
if (do_sms)
size = linetabsize_eol(curwin, curwin->w_topline);
// diff mode: first consume "topfill"
// 'smoothscroll': increase "w_skipcol" until it goes over the end of
// the line, then advance to the next line.
// folding: count each sequence of folded lines as one logical line.
for (int todo = line_count; todo > 0; --todo)
{
# ifdef FEAT_DIFF
if (curwin->w_topfill > 0)
--curwin->w_topfill;
else
# endif
{
linenr_T lnum = curwin->w_topline;
# ifdef FEAT_FOLDING
if (byfold)
// for a closed fold: go to the last line in the fold
(void)hasFolding(lnum, NULL, &lnum);
# endif
if (lnum == curwin->w_topline && do_sms)
{
// 'smoothscroll': increase "w_skipcol" until it goes over
// the end of the line, then advance to the next line.
int add = curwin->w_skipcol > 0 ? width2 : width1;
curwin->w_skipcol += add;
if (curwin->w_skipcol >= size)
{
if (lnum == curbuf->b_ml.ml_line_count)
{
// at the last screen line, can't scroll further
curwin->w_skipcol -= add;
break;
}
++lnum;
}
}
else
{
if (lnum >= curbuf->b_ml.ml_line_count)
break;
++lnum;
}
if (lnum > curwin->w_topline)
{
// approximate w_botline
curwin->w_botline += lnum - curwin->w_topline;
curwin->w_topline = lnum;
# ifdef FEAT_DIFF
curwin->w_topfill = diff_check_fill(curwin, lnum);
# endif
curwin->w_skipcol = 0;
if (todo > 1 && do_sms)
size = linetabsize_eol(curwin, curwin->w_topline);
}
}
}
if (prev_skipcol > 0 || curwin->w_skipcol > 0)
// need to redraw more, because wl_size of the (new) topline may
// now be invalid
redraw_later(UPD_NOT_VALID);
}
else
{
curwin->w_topline += line_count;
curwin->w_botline += line_count; // approximate w_botline
}
if (curwin->w_topline > curbuf->b_ml.ml_line_count)
curwin->w_topline = curbuf->b_ml.ml_line_count;
if (curwin->w_botline > curbuf->b_ml.ml_line_count + 1)
curwin->w_botline = curbuf->b_ml.ml_line_count + 1;
#ifdef FEAT_DIFF
check_topfill(curwin, FALSE);
#endif
#ifdef FEAT_FOLDING
if (hasAnyFolding(curwin))
// Make sure w_topline is at the first of a sequence of folded lines.
(void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL);
#endif
curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE);
if (curwin->w_cursor.lnum < curwin->w_topline)
{
curwin->w_cursor.lnum = curwin->w_topline;
curwin->w_valid &=
~(VALID_WROW|VALID_WCOL|VALID_CHEIGHT|VALID_CROW|VALID_VIRTCOL);
coladvance(curwin->w_curswant);
}
}
/*
* Called after changing the cursor column: make sure that curwin->w_skipcol is
* valid for 'smoothscroll'.
*/
void
adjust_skipcol(void)
{
if (!curwin->w_p_wrap
|| !curwin->w_p_sms
|| curwin->w_cursor.lnum != curwin->w_topline)
return;
int width1 = curwin->w_width - curwin_col_off();
if (width1 <= 0)
return; // no text will be displayed
int width2 = width1 + curwin_col_off2();
long so = get_scrolloff_value();
int scrolloff_cols = so == 0 ? 0 : width1 + (so - 1) * width2;
int scrolled = FALSE;
int row = 0;
int overlap, col;
validate_cheight();
if (curwin->w_cline_height == curwin->w_height
// w_cline_height may be capped at w_height, check there aren't
// actually more lines.
&& plines_win(curwin, curwin->w_cursor.lnum, FALSE)
<= curwin->w_height)
{
// the line just fits in the window, don't scroll
reset_skipcol();
return;
}
validate_virtcol();
overlap = sms_marker_overlap(curwin, curwin->w_width - width2);
while (curwin->w_skipcol > 0
&& curwin->w_virtcol < curwin->w_skipcol + overlap + scrolloff_cols)
{
// scroll a screen line down
if (curwin->w_skipcol >= width1 + width2)
curwin->w_skipcol -= width2;
else
curwin->w_skipcol -= width1;
scrolled = TRUE;
}
if (scrolled)
{
validate_virtcol();
redraw_later(UPD_NOT_VALID);
return; // don't scroll in the other direction now
}
col = curwin->w_virtcol + scrolloff_cols;
// Avoid adjusting for 'scrolloff' beyond the text line height.
if (scrolloff_cols > 0)
{
int size = linetabsize_eol(curwin, curwin->w_topline);
size = width1 + width2 * ((size - width1 + width2 - 1) / width2);
while (col > size)
col -= width2;
}
col -= curwin->w_skipcol;
if (col >= width1)
{
col -= width1;
++row;
}
if (col > width2)
{
row += col / width2;
// col may no longer be used, but make
// sure it is correct anyhow, just in case
col = col % width2;
}
if (row >= curwin->w_height)
{
if (curwin->w_skipcol == 0)
{
curwin->w_skipcol += width1;
--row;
}
if (row >= curwin->w_height)
curwin->w_skipcol += (row - curwin->w_height) * width2;
redraw_later(UPD_NOT_VALID);
}
}
#ifdef FEAT_DIFF
/*
* Don't end up with too many filler lines in the window.
*/
void
check_topfill(
win_T *wp,
int down) // when TRUE scroll down when not enough space
{
int n;
if (wp->w_topfill <= 0)
return;
n = plines_win_nofill(wp, wp->w_topline, TRUE);
if (wp->w_topfill + n > wp->w_height)
{
if (down && wp->w_topline > 1)
{
--wp->w_topline;
wp->w_topfill = 0;
}
else
{
wp->w_topfill = wp->w_height - n;
if (wp->w_topfill < 0)
wp->w_topfill = 0;
}
}
}
#endif
/*
* Scroll the screen one line down, but don't do it if it would move the
* cursor off the screen.
*/
void
scrolldown_clamp(void)
{
int end_row;
#ifdef FEAT_DIFF
int can_fill = (curwin->w_topfill
< diff_check_fill(curwin, curwin->w_topline));
#endif
if (curwin->w_topline <= 1
#ifdef FEAT_DIFF
&& !can_fill
#endif
)
return;
validate_cursor(); // w_wrow needs to be valid
/*
* Compute the row number of the last row of the cursor line
* and make sure it doesn't go off the screen. Make sure the cursor
* doesn't go past 'scrolloff' lines from the screen end.
*/
end_row = curwin->w_wrow;
#ifdef FEAT_DIFF
if (can_fill)
++end_row;
else
end_row += plines_nofill(curwin->w_topline - 1);
#else
end_row += plines(curwin->w_topline - 1);
#endif
if (curwin->w_p_wrap && curwin->w_width != 0)
{
validate_cheight();
validate_virtcol();
end_row += curwin->w_cline_height - 1 -
curwin->w_virtcol / curwin->w_width;
}
if (end_row < curwin->w_height - get_scrolloff_value())
{
#ifdef FEAT_DIFF
if (can_fill)
{
++curwin->w_topfill;
check_topfill(curwin, TRUE);
}
else
{
--curwin->w_topline;
curwin->w_topfill = 0;
}
#else
--curwin->w_topline;
#endif
#ifdef FEAT_FOLDING
(void)hasFolding(curwin->w_topline, &curwin->w_topline, NULL);
#endif
--curwin->w_botline; // approximate w_botline
curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE);
}
}
/*
* Scroll the screen one line up, but don't do it if it would move the cursor
* off the screen.
*/
void
scrollup_clamp(void)
{
int start_row;
if (curwin->w_topline == curbuf->b_ml.ml_line_count
#ifdef FEAT_DIFF
&& curwin->w_topfill == 0
#endif
)
return;
validate_cursor(); // w_wrow needs to be valid
/*
* Compute the row number of the first row of the cursor line
* and make sure it doesn't go off the screen. Make sure the cursor
* doesn't go before 'scrolloff' lines from the screen start.
*/
#ifdef FEAT_DIFF
start_row = curwin->w_wrow - plines_nofill(curwin->w_topline)
- curwin->w_topfill;
#else
start_row = curwin->w_wrow - plines(curwin->w_topline);
#endif
if (curwin->w_p_wrap && curwin->w_width != 0)
{
validate_virtcol();
start_row -= curwin->w_virtcol / curwin->w_width;
}
if (start_row >= get_scrolloff_value())
{
#ifdef FEAT_DIFF
if (curwin->w_topfill > 0)
--curwin->w_topfill;
else
#endif
{
#ifdef FEAT_FOLDING
(void)hasFolding(curwin->w_topline, NULL, &curwin->w_topline);
#endif
++curwin->w_topline;
}
++curwin->w_botline; // approximate w_botline
curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE);
}
}
/*
* Add one line above "lp->lnum". This can be a filler line, a closed fold or
* a (wrapped) text line. Uses and sets "lp->fill".
* Returns the height of the added line in "lp->height".
* Lines above the first one are incredibly high: MAXCOL.
*/
static void
topline_back_winheight(
lineoff_T *lp,
int winheight) // when TRUE limit to window height
{
#ifdef FEAT_DIFF
if (lp->fill < diff_check_fill(curwin, lp->lnum))
{
// Add a filler line.
++lp->fill;
lp->height = 1;
}
else
#endif
{
--lp->lnum;
#ifdef FEAT_DIFF
lp->fill = 0;
#endif
if (lp->lnum < 1)
lp->height = MAXCOL;
else
#ifdef FEAT_FOLDING
if (hasFolding(lp->lnum, &lp->lnum, NULL))
// Add a closed fold
lp->height = 1;
else
#endif
lp->height = PLINES_WIN_NOFILL(curwin, lp->lnum, winheight);
}
}
static void
topline_back(lineoff_T *lp)
{
topline_back_winheight(lp, TRUE);
}
/*
* Add one line below "lp->lnum". This can be a filler line, a closed fold or
* a (wrapped) text line. Uses and sets "lp->fill".
* Returns the height of the added line in "lp->height".
* Lines below the last one are incredibly high.
*/
static void
botline_forw(lineoff_T *lp)
{
#ifdef FEAT_DIFF
if (lp->fill < diff_check_fill(curwin, lp->lnum + 1))
{
// Add a filler line.
++lp->fill;
lp->height = 1;
}
else
#endif
{
++lp->lnum;
#ifdef FEAT_DIFF
lp->fill = 0;
#endif
if (lp->lnum > curbuf->b_ml.ml_line_count)
lp->height = MAXCOL;
else
#ifdef FEAT_FOLDING
if (hasFolding(lp->lnum, NULL, &lp->lnum))
// Add a closed fold
lp->height = 1;
else
#endif
lp->height = PLINES_NOFILL(lp->lnum);
}
}
/*
* Recompute topline to put the cursor at the top of the window.
* Scroll at least "min_scroll" lines.
* If "always" is TRUE, always set topline (for "zt").
*/
void
scroll_cursor_top(int min_scroll, int always)
{
int scrolled = 0;
int extra = 0;
int used;
int i;
linenr_T top; // just above displayed lines
linenr_T bot; // just below displayed lines
linenr_T old_topline = curwin->w_topline;
int old_skipcol = curwin->w_skipcol;
#ifdef FEAT_DIFF
linenr_T old_topfill = curwin->w_topfill;
#endif
linenr_T new_topline;
int off = get_scrolloff_value();
if (mouse_dragging > 0)
off = mouse_dragging - 1;
/*
* Decrease topline until:
* - it has become 1
* - (part of) the cursor line is moved off the screen or
* - moved at least 'scrolljump' lines and
* - at least 'scrolloff' lines above and below the cursor
*/
validate_cheight();
used = curwin->w_cline_height; // includes filler lines above
if (curwin->w_cursor.lnum < curwin->w_topline)
scrolled = used;
#ifdef FEAT_FOLDING
if (hasFolding(curwin->w_cursor.lnum, &top, &bot))
{
--top;
++bot;
}
else
#endif
{
top = curwin->w_cursor.lnum - 1;
bot = curwin->w_cursor.lnum + 1;
}
new_topline = top + 1;
#ifdef FEAT_DIFF
// "used" already contains the number of filler lines above, don't add it
// again.
// Hide filler lines above cursor line by adding them to "extra".
extra += diff_check_fill(curwin, curwin->w_cursor.lnum);
#endif
/*
* Check if the lines from "top" to "bot" fit in the window. If they do,
* set new_topline and advance "top" and "bot" to include more lines.
*/
while (top > 0)
{
#ifdef FEAT_FOLDING
if (hasFolding(top, &top, NULL))
// count one logical line for a sequence of folded lines
i = 1;
else
#endif
i = PLINES_NOFILL(top);
if (top < curwin->w_topline)
scrolled += i;
// If scrolling is needed, scroll at least 'sj' lines.
if ((new_topline >= curwin->w_topline || scrolled > min_scroll)
&& extra >= off)
break;
used += i;
if (extra + i <= off && bot < curbuf->b_ml.ml_line_count)
{
#ifdef FEAT_FOLDING
if (hasFolding(bot, NULL, &bot))
// count one logical line for a sequence of folded lines
++used;
else
#endif
used += plines(bot);
}
if (used > curwin->w_height)
break;
extra += i;
new_topline = top;
--top;
++bot;
}
/*
* If we don't have enough space, put cursor in the middle.
* This makes sure we get the same position when using "k" and "j"
* in a small window.
*/
if (used > curwin->w_height)
scroll_cursor_halfway(FALSE, FALSE);
else
{
/*
* If "always" is FALSE, only adjust topline to a lower value, higher
* value may happen with wrapping lines.
*/
if (new_topline < curwin->w_topline || always)
curwin->w_topline = new_topline;
if (curwin->w_topline > curwin->w_cursor.lnum)
curwin->w_topline = curwin->w_cursor.lnum;
#ifdef FEAT_DIFF
curwin->w_topfill = diff_check_fill(curwin, curwin->w_topline);
if (curwin->w_topfill > 0 && extra > off)
{
curwin->w_topfill -= extra - off;
if (curwin->w_topfill < 0)
curwin->w_topfill = 0;
}
check_topfill(curwin, FALSE);
#endif
if (curwin->w_topline != old_topline)
reset_skipcol();
else if (curwin->w_topline == curwin->w_cursor.lnum)
{
validate_virtcol();
if (curwin->w_skipcol >= curwin->w_virtcol)
// TODO: if the line doesn't fit may optimize w_skipcol instead
// of making it zero
reset_skipcol();
}
if (curwin->w_topline != old_topline
|| curwin->w_skipcol != old_skipcol
#ifdef FEAT_DIFF
|| curwin->w_topfill != old_topfill
#endif
)
curwin->w_valid &=
~(VALID_WROW|VALID_CROW|VALID_BOTLINE|VALID_BOTLINE_AP);
curwin->w_valid |= VALID_TOPLINE;
}
}
/*
* Set w_empty_rows and w_filler_rows for window "wp", having used up "used"
* screen lines for text lines.
*/
void
set_empty_rows(win_T *wp, int used)
{
#ifdef FEAT_DIFF
wp->w_filler_rows = 0;
#endif
if (used == 0)
wp->w_empty_rows = 0; // single line that doesn't fit
else
{
wp->w_empty_rows = wp->w_height - used;
#ifdef FEAT_DIFF
if (wp->w_botline <= wp->w_buffer->b_ml.ml_line_count)
{
wp->w_filler_rows = diff_check_fill(wp, wp->w_botline);
if (wp->w_empty_rows > wp->w_filler_rows)
wp->w_empty_rows -= wp->w_filler_rows;
else
{
wp->w_filler_rows = wp->w_empty_rows;
wp->w_empty_rows = 0;
}
}
#endif
}
}
/*
* Recompute topline to put the cursor at the bottom of the window.
* When scrolling scroll at least "min_scroll" lines.
* If "set_topbot" is TRUE, set topline and botline first (for "zb").
* This is messy stuff!!!
*/
void
scroll_cursor_bot(int min_scroll, int set_topbot)
{
int used;
int scrolled = 0;
int extra = 0;
int i;
linenr_T line_count;
linenr_T old_topline = curwin->w_topline;
int old_skipcol = curwin->w_skipcol;
lineoff_T loff;
lineoff_T boff;
#ifdef FEAT_DIFF
int old_topfill = curwin->w_topfill;
int fill_below_window;
#endif
linenr_T old_botline = curwin->w_botline;
linenr_T old_valid = curwin->w_valid;
int old_empty_rows = curwin->w_empty_rows;
linenr_T cln; // Cursor Line Number
long so = get_scrolloff_value();
int do_sms = curwin->w_p_wrap && curwin->w_p_sms;
cln = curwin->w_cursor.lnum;
if (set_topbot)
{
used = 0;
curwin->w_botline = cln + 1;
loff.lnum = cln + 1;
#ifdef FEAT_DIFF
loff.fill = 0;
#endif
while (TRUE)
{
topline_back_winheight(&loff, FALSE);
if (loff.height == MAXCOL)
break;
if (used + loff.height > curwin->w_height)
{
if (do_sms)
{
// 'smoothscroll' and 'wrap' are set. The above line is
// too long to show in its entirety, so we show just a part
// of it.
if (used < curwin->w_height)
{
int plines_offset = used + loff.height
- curwin->w_height;
used = curwin->w_height;
#ifdef FEAT_DIFF
curwin->w_topfill = loff.fill;
#endif
curwin->w_topline = loff.lnum;
curwin->w_skipcol = skipcol_from_plines(
curwin, plines_offset);
}
}
break;
}
#ifdef FEAT_DIFF
curwin->w_topfill = loff.fill;
#endif
curwin->w_topline = loff.lnum;
used += loff.height;
}
set_empty_rows(curwin, used);
curwin->w_valid |= VALID_BOTLINE|VALID_BOTLINE_AP;
if (curwin->w_topline != old_topline
#ifdef FEAT_DIFF
|| curwin->w_topfill != old_topfill
#endif
|| curwin->w_skipcol != old_skipcol
|| curwin->w_skipcol != 0)
{
curwin->w_valid &= ~(VALID_WROW|VALID_CROW);
if (curwin->w_skipcol != old_skipcol)
redraw_later(UPD_NOT_VALID);
else
reset_skipcol();
}
}
else
validate_botline();
// The lines of the cursor line itself are always used.
#ifdef FEAT_DIFF
used = plines_nofill(cln);
#else
validate_cheight();
used = curwin->w_cline_height;
#endif
// If the cursor is on or below botline, we will at least scroll by the
// height of the cursor line, which is "used". Correct for empty lines,
// which are really part of botline.
if (cln >= curwin->w_botline)
{
scrolled = used;
if (cln == curwin->w_botline)
scrolled -= curwin->w_empty_rows;
if (do_sms)
{
// 'smoothscroll' and 'wrap' are set.
// Calculate how many screen lines the current top line of window
// occupies. If it is occupying more than the entire window, we
// need to scroll the additional clipped lines to scroll past the
// top line before we can move on to the other lines.
int top_plines =
#ifdef FEAT_DIFF
plines_win_nofill
#else
plines_win
#endif
(curwin, curwin->w_topline, FALSE);
int width1 = curwin->w_width - curwin_col_off();
if (width1 > 0)
{
int width2 = width1 + curwin_col_off2();
int skip_lines = 0;
// A similar formula is used in curs_columns().
if (curwin->w_skipcol > width1)
skip_lines += (curwin->w_skipcol - width1) / width2 + 1;
else if (curwin->w_skipcol > 0)
skip_lines = 1;
top_plines -= skip_lines;
if (top_plines > curwin->w_height)
{
scrolled += (top_plines - curwin->w_height);
}
}
}
}
/*
* Stop counting lines to scroll when
* - hitting start of the file
* - scrolled nothing or at least 'sj' lines
* - at least 'scrolloff' lines below the cursor
* - lines between botline and cursor have been counted
*/
#ifdef FEAT_FOLDING
if (!hasFolding(curwin->w_cursor.lnum, &loff.lnum, &boff.lnum))
#endif
{
loff.lnum = cln;
boff.lnum = cln;
}
#ifdef FEAT_DIFF
loff.fill = 0;
boff.fill = 0;
fill_below_window = diff_check_fill(curwin, curwin->w_botline)
- curwin->w_filler_rows;
#endif
while (loff.lnum > 1)
{
// Stop when scrolled nothing or at least "min_scroll", found "extra"
// context for 'scrolloff' and counted all lines below the window.
if ((((scrolled <= 0 || scrolled >= min_scroll)
&& extra >= (mouse_dragging > 0 ? mouse_dragging - 1 : so))
|| boff.lnum + 1 > curbuf->b_ml.ml_line_count)
&& loff.lnum <= curwin->w_botline
#ifdef FEAT_DIFF
&& (loff.lnum < curwin->w_botline
|| loff.fill >= fill_below_window)
#endif
)
break;
// Add one line above
topline_back(&loff);
if (loff.height == MAXCOL)
used = MAXCOL;
else
used += loff.height;
if (used > curwin->w_height)
break;
if (loff.lnum >= curwin->w_botline
#ifdef FEAT_DIFF
&& (loff.lnum > curwin->w_botline
|| loff.fill <= fill_below_window)
#endif
)
{
// Count screen lines that are below the window.
scrolled += loff.height;
if (loff.lnum == curwin->w_botline
#ifdef FEAT_DIFF
&& loff.fill == 0
#endif
)
scrolled -= curwin->w_empty_rows;
}
if (boff.lnum < curbuf->b_ml.ml_line_count)
{
// Add one line below
botline_forw(&boff);
used += boff.height;
if (used > curwin->w_height)
break;
if (extra < ( mouse_dragging > 0 ? mouse_dragging - 1 : so)
|| scrolled < min_scroll)
{
extra += boff.height;
if (boff.lnum >= curwin->w_botline
#ifdef FEAT_DIFF
|| (boff.lnum + 1 == curwin->w_botline
&& boff.fill > curwin->w_filler_rows)
#endif
)
{
// Count screen lines that are below the window.
scrolled += boff.height;
if (boff.lnum == curwin->w_botline
#ifdef FEAT_DIFF
&& boff.fill == 0
#endif
)
scrolled -= curwin->w_empty_rows;
}
}
}
}
// curwin->w_empty_rows is larger, no need to scroll
if (scrolled <= 0)
line_count = 0;
// more than a screenfull, don't scroll but redraw
else if (used > curwin->w_height)
line_count = used;
// scroll minimal number of lines
else
{
line_count = 0;
#ifdef FEAT_DIFF
boff.fill = curwin->w_topfill;
#endif
boff.lnum = curwin->w_topline - 1;
for (i = 0; i < scrolled && boff.lnum < curwin->w_botline; )
{
botline_forw(&boff);
i += boff.height;
++line_count;
}
if (i < scrolled) // below curwin->w_botline, don't scroll
line_count = 9999;
}
/*
* Scroll up if the cursor is off the bottom of the screen a bit.
* Otherwise put it at 1/2 of the screen.
*/
if (line_count >= curwin->w_height && line_count > min_scroll)
scroll_cursor_halfway(FALSE, TRUE);
else if (line_count > 0)
{
if (do_sms)
scrollup(scrolled, TRUE); // TODO
else
scrollup(line_count, TRUE);
}
/*
* If topline didn't change we need to restore w_botline and w_empty_rows
* (we changed them).
* If topline did change, update_screen() will set botline.
*/
if (curwin->w_topline == old_topline
&& curwin->w_skipcol == old_skipcol
&& set_topbot)
{
curwin->w_botline = old_botline;
curwin->w_empty_rows = old_empty_rows;
curwin->w_valid = old_valid;
}
curwin->w_valid |= VALID_TOPLINE;
// Make sure cursor is still visible after adjusting skipcol for "zb".
if (set_topbot)
cursor_correct_sms();
}
/*
* Recompute topline to put the cursor halfway the window
* If "atend" is TRUE, also put it halfway at the end of the file.
*/
void
scroll_cursor_halfway(int atend, int prefer_above)
{
int above = 0;
linenr_T topline;
colnr_T skipcol = 0;
#ifdef FEAT_DIFF
int topfill = 0;
#endif
int below = 0;
int used;
lineoff_T loff;
lineoff_T boff;
#ifdef FEAT_DIFF
linenr_T old_topline = curwin->w_topline;
#endif
#ifdef FEAT_PROP_POPUP
// if the width changed this needs to be updated first
may_update_popup_position();
#endif
loff.lnum = boff.lnum = curwin->w_cursor.lnum;
#ifdef FEAT_FOLDING
(void)hasFolding(loff.lnum, &loff.lnum, &boff.lnum);
#endif
#ifdef FEAT_DIFF
used = plines_nofill(loff.lnum);
loff.fill = 0;
boff.fill = 0;
#else
used = plines(loff.lnum);
#endif
topline = loff.lnum;
int want_height;
int do_sms = curwin->w_p_wrap && curwin->w_p_sms;
if (do_sms)
{
// 'smoothscroll' and 'wrap' are set
if (atend)
{
want_height = (curwin->w_height - used) / 2;
used = 0;
}
else
want_height = curwin->w_height;
}
while (topline > 1)
{
// If using smoothscroll, we can precisely scroll to the
// exact point where the cursor is halfway down the screen.
if (do_sms)
{
topline_back_winheight(&loff, FALSE);
if (loff.height == MAXCOL)
break;
used += loff.height;
if (!atend && boff.lnum < curbuf->b_ml.ml_line_count)
{
botline_forw(&boff);
used += boff.height;
}
if (used > want_height)
{
if (used - loff.height < want_height)
{
topline = loff.lnum;
#ifdef FEAT_DIFF
topfill = loff.fill;
#endif
skipcol = skipcol_from_plines(curwin, used - want_height);
}
break;
}
topline = loff.lnum;
#ifdef FEAT_DIFF
topfill = loff.fill;
#endif
continue;
}
// If not using smoothscroll, we have to iteratively find how many
// lines to scroll down to roughly fit the cursor.
// This may not be right in the middle if the lines'
// physical height > 1 (e.g. 'wrap' is on).
// Depending on "prefer_above" we add a line above or below first.
// Loop twice to avoid duplicating code.
int done = FALSE;
for (int round = 1; round <= 2; ++round)
{
if (prefer_above ? (round == 2 && below < above)
: (round == 1 && below <= above))
{
// add a line below the cursor
if (boff.lnum < curbuf->b_ml.ml_line_count)
{
botline_forw(&boff);
used += boff.height;
if (used > curwin->w_height)
{
done = TRUE;
break;
}
below += boff.height;
}
else
{
++below; // count a "~" line
if (atend)
++used;
}
}
if (prefer_above ? (round == 1 && below >= above)
: (round == 1 && below > above))
{
// add a line above the cursor
topline_back(&loff);
if (loff.height == MAXCOL)
used = MAXCOL;
else
used += loff.height;
if (used > curwin->w_height)
{
done = TRUE;
break;
}
above += loff.height;
topline = loff.lnum;
#ifdef FEAT_DIFF
topfill = loff.fill;
#endif
}
}
if (done)
break;
}
#ifdef FEAT_FOLDING
if (!hasFolding(topline, &curwin->w_topline, NULL))
#endif
{
if (curwin->w_topline != topline
|| skipcol != 0
|| curwin->w_skipcol != 0)
{
curwin->w_topline = topline;
if (skipcol != 0)
{
curwin->w_skipcol = skipcol;
redraw_later(UPD_NOT_VALID);
}
else if (do_sms)
reset_skipcol();
}
}
#ifdef FEAT_DIFF
curwin->w_topfill = topfill;
if (old_topline > curwin->w_topline + curwin->w_height)
curwin->w_botfill = FALSE;
check_topfill(curwin, FALSE);
#endif
curwin->w_valid &= ~(VALID_WROW|VALID_CROW|VALID_BOTLINE|VALID_BOTLINE_AP);
curwin->w_valid |= VALID_TOPLINE;
}
/*
* Correct the cursor position so that it is in a part of the screen at least
* 'scrolloff' lines from the top and bottom, if possible.
* If not possible, put it at the same position as scroll_cursor_halfway().
* When called topline must be valid!
*/
void
cursor_correct(void)
{
int above = 0; // screen lines above topline
linenr_T topline;
int below = 0; // screen lines below botline
linenr_T botline;
int above_wanted, below_wanted;
linenr_T cln; // Cursor Line Number
int max_off;
long so = get_scrolloff_value();
/*
* How many lines we would like to have above/below the cursor depends on
* whether the first/last line of the file is on screen.
*/
above_wanted = so;
below_wanted = so;
if (mouse_dragging > 0)
{
above_wanted = mouse_dragging - 1;
below_wanted = mouse_dragging - 1;
}
if (curwin->w_topline == 1)
{
above_wanted = 0;
max_off = curwin->w_height / 2;
if (below_wanted > max_off)
below_wanted = max_off;
}
validate_botline();
if (curwin->w_botline == curbuf->b_ml.ml_line_count + 1
&& mouse_dragging == 0)
{
below_wanted = 0;
max_off = (curwin->w_height - 1) / 2;
if (above_wanted > max_off)
above_wanted = max_off;
}
/*
* If there are sufficient file-lines above and below the cursor, we can
* return now.
*/
cln = curwin->w_cursor.lnum;
if (cln >= curwin->w_topline + above_wanted
&& cln < curwin->w_botline - below_wanted
#ifdef FEAT_FOLDING
&& !hasAnyFolding(curwin)
#endif
)
return;
if (curwin->w_p_sms && !curwin->w_p_wrap)
{
// 'smoothscroll' is active
if (curwin->w_cline_height == curwin->w_height)
{
// The cursor line just fits in the window, don't scroll.
reset_skipcol();
return;
}
// TODO: If the cursor line doesn't fit in the window then only adjust
// w_skipcol.
}
/*
* Narrow down the area where the cursor can be put by taking lines from
* the top and the bottom until:
* - the desired context lines are found
* - the lines from the top is past the lines from the bottom
*/
topline = curwin->w_topline;
botline = curwin->w_botline - 1;
#ifdef FEAT_DIFF
// count filler lines as context
above = curwin->w_topfill;
below = curwin->w_filler_rows;
#endif
while ((above < above_wanted || below < below_wanted) && topline < botline)
{
if (below < below_wanted && (below <= above || above >= above_wanted))
{
#ifdef FEAT_FOLDING
if (hasFolding(botline, &botline, NULL))
++below;
else
#endif
below += plines(botline);
--botline;
}
if (above < above_wanted && (above < below || below >= below_wanted))
{
#ifdef FEAT_FOLDING
if (hasFolding(topline, NULL, &topline))
++above;
else
#endif
above += PLINES_NOFILL(topline);
#ifdef FEAT_DIFF
// Count filler lines below this line as context.
if (topline < botline)
above += diff_check_fill(curwin, topline + 1);
#endif
++topline;
}
}
if (topline == botline || botline == 0)
curwin->w_cursor.lnum = topline;
else if (topline > botline)
curwin->w_cursor.lnum = botline;
else
{
if (cln < topline && curwin->w_topline > 1)
{
curwin->w_cursor.lnum = topline;
curwin->w_valid &=
~(VALID_WROW|VALID_WCOL|VALID_CHEIGHT|VALID_CROW);
}
if (cln > botline && curwin->w_botline <= curbuf->b_ml.ml_line_count)
{
curwin->w_cursor.lnum = botline;
curwin->w_valid &=
~(VALID_WROW|VALID_WCOL|VALID_CHEIGHT|VALID_CROW);
}
}
curwin->w_valid |= VALID_TOPLINE;
}
/*
* Decide how much overlap to use for page-up or page-down scrolling.
* This is symmetric, so that doing both keeps the same lines displayed.
* Three lines are examined:
*
* before CTRL-F after CTRL-F / before CTRL-B
* etc. l1
* l1 last but one line ------------
* l2 last text line l2 top text line
* ------------- l3 second text line
* l3 etc.
*/
static int get_scroll_overlap(int dir)
{
lineoff_T loff;
int min_height = curwin->w_height - 2;
validate_botline();
if ((dir == BACKWARD && curwin->w_topline == 1)
|| (dir == FORWARD && curwin->w_botline > curbuf->b_ml.ml_line_count))
return min_height + 2; // no overlap, still handle 'smoothscroll'
loff.lnum = dir == FORWARD ? curwin->w_botline : curwin->w_topline - 1;
#ifdef FEAT_DIFF
loff.fill = diff_check_fill(curwin, loff.lnum + (dir == BACKWARD))
- (dir == FORWARD ? curwin->w_filler_rows : curwin->w_topfill);
loff.height = loff.fill > 0 ? 1 : plines_nofill(loff.lnum);
#else
loff.height = plines(loff.lnum);
#endif
int h1 = loff.height;
if (h1 > min_height)
return min_height + 2; // no overlap
if (dir == FORWARD)
topline_back(&loff);
else
botline_forw(&loff);
int h2 = loff.height;
if (h2 == MAXCOL || h2 + h1 > min_height)
return min_height + 2; // no overlap
if (dir == FORWARD)
topline_back(&loff);
else
botline_forw(&loff);
int h3 = loff.height;
if (h3 == MAXCOL || h3 + h2 > min_height)
return min_height + 2; // no overlap
if (dir == FORWARD)
topline_back(&loff);
else
botline_forw(&loff);
int h4 = loff.height;
if (h4 == MAXCOL || h4 + h3 + h2 > min_height || h3 + h2 + h1 > min_height)
return min_height + 1; // 1 line overlap
else
return min_height; // 2 lines overlap
}
/*
* Scroll "count" lines with 'smoothscroll' in direction "dir". Return TRUE
* when scrolling happened. Adjust "curscount" for scrolling different amount of
* lines when 'smoothscroll' is disabled.
*/
static int scroll_with_sms(int dir, long count, long *curscount)
{
int prev_sms = curwin->w_p_sms;
colnr_T prev_skipcol = curwin->w_skipcol;
linenr_T prev_topline = curwin->w_topline;
#ifdef FEAT_DIFF
int prev_topfill = curwin->w_topfill;
#endif
curwin->w_p_sms = TRUE;
scroll_redraw(dir == FORWARD, count);
// Not actually smoothscrolling but ended up with partially visible line.
// Continue scrolling until skipcol is zero.
if (!prev_sms && curwin->w_skipcol > 0)
{
int fixdir = dir;
// Reverse the scroll direction when topline already changed. One line
// extra for scrolling backward so that consuming skipcol is symmetric.
if (labs(curwin->w_topline - prev_topline) > (dir == BACKWARD))
fixdir = dir * -1;
while (curwin->w_skipcol > 0
&& curwin->w_topline < curbuf->b_ml.ml_line_count)
{
scroll_redraw(fixdir == FORWARD, 1);
*curscount += (fixdir == dir ? 1 : -1);
}
}
curwin->w_p_sms = prev_sms;
return curwin->w_topline == prev_topline
#ifdef FEAT_DIFF
&& curwin->w_topfill == prev_topfill
#endif
&& curwin->w_skipcol == prev_skipcol;
}
/*
* Move screen "count" (half) pages up ("dir" is BACKWARD) or down ("dir" is
* FORWARD) and update the screen. Handle moving the cursor and not scrolling
* to reveal end of buffer lines for half-page scrolling with CTRL-D and CTRL-U.
*
* Return FAIL for failure, OK otherwise.
*/
int
pagescroll(int dir, long count, int half)
{
int nochange = TRUE;
int buflen = curbuf->b_ml.ml_line_count;
colnr_T prev_col = curwin->w_cursor.col;
colnr_T prev_curswant = curwin->w_curswant;
linenr_T prev_lnum = curwin->w_cursor.lnum;
oparg_T oa = { 0 };
cmdarg_T ca = { 0 };
ca.oap = &oa;
if (half)
{
// Scroll [count], 'scroll' or current window height lines.
if (count)
curwin->w_p_scr = MIN(curwin->w_height, count);
count = MIN(curwin->w_height, curwin->w_p_scr);
long curscount = count;
// Adjust count so as to not reveal end of buffer lines.
if (dir == FORWARD
&& (curwin->w_topline + curwin->w_height + count > buflen
#ifdef FEAT_FOLDING
|| hasAnyFolding(curwin)
#endif
))
{
int n = plines_correct_topline(curwin, curwin->w_topline, FALSE);
if (n - count < curwin->w_height && curwin->w_topline < buflen)
n += plines_m_win(curwin, curwin->w_topline + 1, buflen,
curwin->w_height + count);
if (n < curwin->w_height + count)
count = n - curwin->w_height;
}
// (Try to) scroll the window unless already at the end of the buffer.
if (count > 0)
{
nochange = scroll_with_sms(dir, count, &curscount);
curwin->w_cursor.lnum = prev_lnum;
curwin->w_cursor.col = prev_col;
curwin->w_curswant = prev_curswant;
}
// Move the cursor the same amount of screen lines.
if (curwin->w_p_wrap)
nv_screengo(&oa, dir, curscount);
else if (dir == FORWARD)
cursor_down_inner(curwin, curscount);
else
cursor_up_inner(curwin, curscount);
}
else
{
// Scroll [count] times 'window' or current window height lines.
count *= ((ONE_WINDOW && p_window > 0 && p_window < Rows - 1) ?
MAX(1, p_window - 2) : get_scroll_overlap(dir));
nochange = scroll_with_sms(dir, count, &count);
if (!nochange)
{
// Place cursor at top or bottom of window.
validate_botline();
linenr_T lnum = (dir == FORWARD ? curwin->w_topline
: curwin->w_botline - 1);
// In silent Ex mode the value of w_botline - 1 may be 0,
// but cursor lnum needs to be at least 1.
curwin->w_cursor.lnum = MAX(lnum, 1);
}
}
if (get_scrolloff_value() > 0)
cursor_correct();
#ifdef FEAT_FOLDING
// Move cursor to first line of closed fold.
foldAdjustCursor();
#endif
nochange = nochange
&& prev_col == curwin->w_cursor.col
&& prev_lnum == curwin->w_cursor.lnum;
// Error if both the viewport and cursor did not change.
if (nochange)
beep_flush();
else if (!curwin->w_p_sms)
beginline(BL_SOL | BL_FIX);
else if (p_sol)
nv_g_home_m_cmd(&ca);
return nochange;
}
void
do_check_cursorbind(void)
{
static win_T *prev_curwin = NULL;
static pos_T prev_cursor = {0, 0, 0};
if (curwin == prev_curwin && EQUAL_POS(curwin->w_cursor, prev_cursor))
return;
prev_curwin = curwin;
prev_cursor = curwin->w_cursor;
linenr_T line = curwin->w_cursor.lnum;
colnr_T col = curwin->w_cursor.col;
colnr_T coladd = curwin->w_cursor.coladd;
colnr_T curswant = curwin->w_curswant;
int set_curswant = curwin->w_set_curswant;
win_T *old_curwin = curwin;
buf_T *old_curbuf = curbuf;
int old_VIsual_select = VIsual_select;
int old_VIsual_active = VIsual_active;
/*
* loop through the cursorbound windows
*/
VIsual_select = VIsual_active = 0;
FOR_ALL_WINDOWS(curwin)
{
curbuf = curwin->w_buffer;
// skip original window and windows with 'nocursorbind'
if (curwin != old_curwin && curwin->w_p_crb)
{
# ifdef FEAT_DIFF
if (curwin->w_p_diff)
curwin->w_cursor.lnum =
diff_get_corresponding_line(old_curbuf, line);
else
# endif
curwin->w_cursor.lnum = line;
curwin->w_cursor.col = col;
curwin->w_cursor.coladd = coladd;
curwin->w_curswant = curswant;
curwin->w_set_curswant = set_curswant;
// Make sure the cursor is in a valid position. Temporarily set
// "restart_edit" to allow the cursor to be beyond the EOL.
int restart_edit_save = restart_edit;
restart_edit = 'a';
check_cursor();
// Avoid a scroll here for the cursor position, 'scrollbind' is
// more important.
if (!curwin->w_p_scb)
validate_cursor();
restart_edit = restart_edit_save;
// Correct cursor for multi-byte character.
if (has_mbyte)
mb_adjust_cursor();
redraw_later(UPD_VALID);
// Only scroll when 'scrollbind' hasn't done this.
if (!curwin->w_p_scb)
update_topline();
curwin->w_redr_status = TRUE;
}
}
/*
* reset current-window
*/
VIsual_select = old_VIsual_select;
VIsual_active = old_VIsual_active;
curwin = old_curwin;
curbuf = old_curbuf;
}
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