void
WindowScroll(XtermWidget xw, int top, Bool always GCC_UNUSED)
{
TScreen *screen = TScreenOf(xw);
#if OPT_SCROLL_LOCK
if (screen->allowScrollLock && (screen->scroll_lock && !always)) {
if (screen->scroll_dirty) {
screen->scroll_dirty = False;
ScrnRefresh(xw, 0, 0, MaxRows(screen), MaxCols(screen), False);
}
} else
#endif
{
int i;
if (top < -screen->savedlines) {
top = -screen->savedlines;
} else if (top > 0) {
top = 0;
}
if ((i = screen->topline - top) != 0) {
int lines;
int scrolltop, scrollheight, refreshtop;
if (screen->cursor_state)
HideCursor();
lines = i > 0 ? i : -i;
if (lines > MaxRows(screen))
lines = MaxRows(screen);
scrollheight = screen->max_row - lines + 1;
if (i > 0)
refreshtop = scrolltop = 0;
else {
scrolltop = lines;
refreshtop = scrollheight;
}
scrolling_copy_area(xw, scrolltop, scrollheight, -i);
screen->topline = top;
ScrollSelection(screen, i, True);
xtermClear2(xw,
OriginX(screen),
OriginY(screen) + refreshtop * FontHeight(screen),
(unsigned) Width(screen),
(unsigned) (lines * FontHeight(screen)));
ScrnRefresh(xw, refreshtop, 0, lines, MaxCols(screen), False);
#if OPT_BLINK_CURS || OPT_BLINK_TEXT
RestartBlinking(screen);
#endif
}
}
ScrollBarDrawThumb(screen->scrollWidget);
}
void WindowScroll(TScreen *screen,int top)
{
register int i, lines;
register int scrolltop, scrollheight, refreshtop;
register int x = 0;
if (top < -screen->savedlines)
top = -screen->savedlines;
else if (top > 0)
top = 0;
if((i = screen->topline - top) == 0)
{
ScrollBarDrawThumb(screen->scrollWidget);
return;
}
/*ScrollSelection(screen, i);*/
if(screen->cursor_state)
HideCursor();
lines = i > 0 ? i : -i;
if(lines > screen->max_row + 1)
lines = screen->max_row + 1;
scrollheight = screen->max_row - lines + 1;
if(i > 0)
refreshtop = scrolltop = 0;
else
{
scrolltop = lines;
refreshtop = scrollheight;
}
/*x = screen->scrollbar + screen->border;*/
x=OriginX(screen);
scrolling_copy_area(screen, scrolltop, scrollheight, -i);
screen->topline = top;
ScrollSelection(screen, i);
XClearArea(
screen->display,
/*TextWindow(screen),*/
VWindow(screen),
(int) x,
(int) refreshtop * FontHeight(screen) + screen->border,
(unsigned) Width(screen),
(unsigned) lines * FontHeight(screen),
FALSE);
ScrnRefresh(screen, refreshtop, 0, lines, screen->max_col + 1, False);
ScrollBarDrawThumb(screen->scrollWidget);
}
/*
* These routines are used for the jump scroll feature
*/
void
FlushScroll(register TScreen *screen)
{
register int i;
register int shift = -screen->topline;
register int bot = screen->max_row - shift;
register int refreshtop;
register int refreshheight;
register int scrolltop;
register int scrollheight;
if(screen->cursor_state)
HideCursor();
if(screen->scroll_amt > 0) {
refreshheight = screen->refresh_amt;
scrollheight = screen->bot_marg - screen->top_marg -
refreshheight + 1;
if((refreshtop = screen->bot_marg - refreshheight + 1 + shift) >
(i = screen->max_row - screen->scroll_amt + 1))
refreshtop = i;
if(screen->scrollWidget && !screen->alternate
&& screen->top_marg == 0) {
scrolltop = 0;
if((scrollheight += shift) > i)
scrollheight = i;
if((i = screen->bot_marg - bot) > 0 &&
(refreshheight -= i) < screen->scroll_amt)
refreshheight = screen->scroll_amt;
if((i = screen->savedlines) < screen->savelines) {
if((i += screen->scroll_amt) >
screen->savelines)
i = screen->savelines;
screen->savedlines = i;
ScrollBarDrawThumb(screen->scrollWidget);
}
} else {
scrolltop = screen->top_marg + shift;
if((i = bot - (screen->bot_marg - screen->refresh_amt +
screen->scroll_amt)) > 0) {
if(bot < screen->bot_marg)
refreshheight = screen->scroll_amt + i;
} else {
scrollheight += i;
refreshheight = screen->scroll_amt;
if((i = screen->top_marg + screen->scroll_amt -
1 - bot) > 0) {
refreshtop += i;
refreshheight -= i;
}
}
}
} else {
refreshheight = -screen->refresh_amt;
scrollheight = screen->bot_marg - screen->top_marg -
refreshheight + 1;
refreshtop = screen->top_marg + shift;
scrolltop = refreshtop + refreshheight;
if((i = screen->bot_marg - bot) > 0)
scrollheight -= i;
if((i = screen->top_marg + refreshheight - 1 - bot) > 0)
refreshheight -= i;
}
scrolling_copy_area(screen, scrolltop+screen->scroll_amt,
scrollheight, screen->scroll_amt);
ScrollSelection(screen, -(screen->scroll_amt));
screen->scroll_amt = 0;
screen->refresh_amt = 0;
if(refreshheight > 0) {
ClearCurBackground(screen,
(int) refreshtop * FontHeight(screen) + screen->border,
(int) OriginX(screen),
(unsigned) refreshheight * FontHeight(screen),
(unsigned) Width(screen));
ScrnRefresh(screen, refreshtop, 0, refreshheight,
screen->max_col + 1, False);
}
}
/*
* scrolls the screen by amount lines, erases bottom, doesn't alter
* cursor position (i.e. cursor moves down amount relative to text).
* All done within the scrolling region, of course.
* requires: amount > 0
*/
void
Scroll(register TScreen *screen, register int amount)
{
register int i = screen->bot_marg - screen->top_marg + 1;
register int shift;
register int bot;
register int refreshtop = 0;
register int refreshheight;
register int scrolltop;
register int scrollheight;
if(screen->cursor_state)
HideCursor();
if (amount > i)
amount = i;
if(screen->jumpscroll) {
if(screen->scroll_amt > 0) {
if(screen->refresh_amt + amount > i)
FlushScroll(screen);
screen->scroll_amt += amount;
screen->refresh_amt += amount;
} else {
if(screen->scroll_amt < 0)
FlushScroll(screen);
screen->scroll_amt = amount;
screen->refresh_amt = amount;
}
refreshheight = 0;
} else {
ScrollSelection(screen, -(amount));
if (amount == i) {
ClearScreen(screen);
return;
}
shift = -screen->topline;
bot = screen->max_row - shift;
scrollheight = i - amount;
refreshheight = amount;
if((refreshtop = screen->bot_marg - refreshheight + 1 + shift) >
(i = screen->max_row - refreshheight + 1))
refreshtop = i;
if(screen->scrollWidget && !screen->alternate
&& screen->top_marg == 0) {
scrolltop = 0;
if((scrollheight += shift) > i)
scrollheight = i;
if((i = screen->savedlines) < screen->savelines) {
if((i += amount) > screen->savelines)
i = screen->savelines;
screen->savedlines = i;
ScrollBarDrawThumb(screen->scrollWidget);
}
} else {
scrolltop = screen->top_marg + shift;
if((i = screen->bot_marg - bot) > 0) {
scrollheight -= i;
if((i = screen->top_marg + amount - 1 - bot) >= 0) {
refreshtop += i;
refreshheight -= i;
}
}
}
if (screen->multiscroll && amount == 1 &&
screen->topline == 0 && screen->top_marg == 0 &&
screen->bot_marg == screen->max_row) {
if (screen->incopy < 0 && screen->scrolls == 0)
CopyWait(screen);
screen->scrolls++;
}
scrolling_copy_area(screen, scrolltop+amount, scrollheight, amount);
if(refreshheight > 0) {
ClearCurBackground(screen,
(int) refreshtop * FontHeight(screen) + screen->border,
(int) OriginX(screen),
(unsigned) refreshheight * FontHeight(screen),
(unsigned) Width(screen));
if(refreshheight > shift)
refreshheight = shift;
}
}
if(screen->scrollWidget && !screen->alternate && screen->top_marg == 0)
ScrnDeleteLine(screen, screen->allbuf,
screen->bot_marg + screen->savelines, 0,
amount, screen->max_col + 1);
else
ScrnDeleteLine(screen, screen->visbuf,
screen->bot_marg, screen->top_marg,
amount, screen->max_col + 1);
if(refreshheight > 0)
ScrnRefresh(screen, refreshtop, 0, refreshheight,
screen->max_col + 1, False);
}
