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patch 9.0.0886: horizontal mouse scroll only works in the GUI

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Problem:    Horizontal mouse scroll only works in the GUI.
Solution:   Make horizontal mouse scroll also work in a terminal.
            (Christopher Plewright, closes #11448)
This commit is contained in:
Christopher Plewright
2022-11-15 17:43:36 +00:00
committed by Bram Moolenaar
parent b53a190e9f
commit 44c2209352
10 changed files with 234 additions and 247 deletions
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69
src/ui.c
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@@ -1125,6 +1125,75 @@ check_row(int row)
return row;
}
/*
* Return length of line "lnum" in screen cells for horizontal scrolling.
*/
long
scroll_line_len(linenr_T lnum)
{
char_u *p = ml_get(lnum);
colnr_T col = 0;
if (*p != NUL)
for (;;)
{
int w = chartabsize(p, col);
MB_PTR_ADV(p);
if (*p == NUL) // don't count the last character
break;
col += w;
}
return col;
}
/*
* Find the longest visible line number. This is used for horizontal
* scrolling. If this is not possible (or not desired, by setting 'h' in
* "guioptions") then the current line number is returned.
*/
linenr_T
ui_find_longest_lnum(void)
{
linenr_T ret = 0;
// Calculate maximum for horizontal scrollbar. Check for reasonable
// line numbers, topline and botline can be invalid when displaying is
// postponed.
if (
# ifdef FEAT_GUI
(!gui.in_use || vim_strchr(p_go, GO_HORSCROLL) == NULL) &&
# endif
curwin->w_topline <= curwin->w_cursor.lnum
&& curwin->w_botline > curwin->w_cursor.lnum
&& curwin->w_botline <= curbuf->b_ml.ml_line_count + 1)
{
linenr_T lnum;
long n;
long max = 0;
// Use maximum of all visible lines. Remember the lnum of the
// longest line, closest to the cursor line. Used when scrolling
// below.
for (lnum = curwin->w_topline; lnum < curwin->w_botline; ++lnum)
{
n = scroll_line_len(lnum);
if (n > max)
{
max = n;
ret = lnum;
}
else if (n == max && abs((int)(lnum - curwin->w_cursor.lnum))
< abs((int)(ret - curwin->w_cursor.lnum)))
ret = lnum;
}
}
else
// Use cursor line only.
ret = curwin->w_cursor.lnum;
return ret;
}
/*
* Called when focus changed. Used for the GUI or for systems where this can
* be done in the console (Win32).