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screen: elide a variable and serialize some logic for clarity 

Also, don't force a full refresh of the edit window simply because the
current line needs to be horizontally scrolled.  And further, when the
adjustment of edittop has determined that a full refresh is needed,
get out and don't bother scrolling some lines first.
master
Benno Schulenberg 2016-04-13 13:14:36 +02:00
parent 503654e60e
commit 2246029447
1 changed files with 9 additions and 10 deletions
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19
src/winio.c
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@ -2853,7 +2853,6 @@ void edit_scroll(scroll_dir direction, ssize_t nlines)
{
ssize_t i;
filestruct *foo;
bool do_redraw = need_screen_update(0);
assert(nlines > 0);
@ -2880,7 +2879,7 @@ void edit_scroll(scroll_dir direction, ssize_t nlines)
ssize_t len = strlenpt(openfile->edittop->data) / COLS;
i -= len;
if (len > 0)
do_redraw = TRUE;
edit_refresh_needed = TRUE;
}
#endif
}
@ -2888,14 +2887,14 @@ void edit_scroll(scroll_dir direction, ssize_t nlines)
/* Limit nlines to the number of lines we could scroll. */
nlines -= i;
/* Don't bother scrolling zero lines or more than the number of
* lines in the edit window minus one; in both cases, get out, and
* call edit_refresh() beforehand if we need to. */
if (nlines == 0 || do_redraw || nlines >= editwinrows) {
if (do_redraw || nlines >= editwinrows)
edit_refresh_needed = TRUE;
/* Don't bother scrolling zero lines, nor more than the window can hold. */
if (nlines == 0)
return;
if (nlines >= editwinrows)
edit_refresh_needed = TRUE;
if (edit_refresh_needed == TRUE)
return;
}
/* Scroll the text of the edit window up or down nlines lines,
* depending on the value of direction. */
@ -2943,7 +2942,7 @@ void edit_scroll(scroll_dir direction, ssize_t nlines)
for (i = nlines; i > 0 && foo != NULL; i--) {
if ((i == nlines && direction == DOWNWARD) || (i == 1 &&
direction == UPWARD)) {
if (do_redraw)
if (need_screen_update(0))
update_line(foo, (foo == openfile->current) ?
openfile->current_x : 0);
} else