/* If scroll_only is FALSE, move up one line. If scroll_only is TRUE,
* scroll up one line without scrolling the cursor. */
void do_up(bool scroll_only)
{
size_t was_column = xplustabs();
/* If we're at the top of the file, or if scroll_only is TRUE and
* the top of the file is onscreen, get out. */
if (openfile->current == openfile->fileage ||
(scroll_only && openfile->edittop == openfile->fileage))
return;
assert(ISSET(SOFTWRAP) || openfile->current_y == openfile->current->lineno - openfile->edittop->lineno);
/* Move the current line of the edit window up. */
openfile->current = openfile->current->prev;
openfile->current_x = actual_x(openfile->current->data,
openfile->placewewant);
/* When the cursor was on the first line of the edit window (or when just
* scrolling without moving the cursor), scroll the edit window up -- one
* line if we're in smooth scrolling mode, and half a page otherwise. */
if (openfile->current->next == openfile->edittop || scroll_only)
edit_scroll(UPWARD, (ISSET(SMOOTH_SCROLL) || scroll_only) ?
1 : editwinrows / 2 + 1);
/* If the lines weren't already redrawn, see if they need to be. */
if (openfile->current_y > 0) {
/* Redraw the prior line if it was horizontally scrolled. */
if (need_horizontal_scroll(was_column, 0))
update_line(openfile->current->next, 0);
/* Redraw the current line if it needs to be horizontally scrolled. */
if (need_horizontal_scroll(0, xplustabs()))
update_line(openfile->current, openfile->current_x);
}
}
/* Move down one page. */
void do_page_down(void)
{
int i;
/* If there's less than a page of text left on the screen, put the
* cursor at the beginning of the last line of the file, and then
* update the edit window. */
if (openfile->current->lineno + editwinrows - 2 >=
openfile->filebot->lineno) {
do_last_line();
return;
}
/* If we're not in smooth scrolling mode, put the cursor at the
* beginning of the top line of the edit window, as Pico does. */
#ifndef NANO_TINY
if (!ISSET(SMOOTH_SCROLL)) {
#endif
openfile->current = openfile->edittop;
openfile->placewewant = 0;
#ifndef NANO_TINY
}
#endif
for (i = editwinrows - 2; i > 0 && openfile->current !=
openfile->filebot; i--)
openfile->current = openfile->current->next;
openfile->current_x = actual_x(openfile->current->data,
openfile->placewewant);
/* Scroll the edit window down a page. */
edit_scroll(DOWN_DIR, editwinrows - 2);
}
/* If scroll_only is FALSE, move down one line. If scroll_only is TRUE,
* scroll down one line without scrolling the cursor. */
void do_down(
#ifndef NANO_TINY
bool scroll_only
#else
void
#endif
)
{
bool onlastline = FALSE;
/* If we're at the bottom of the file, get out. */
if (openfile->current == openfile->filebot)
return;
assert(ISSET(SOFTWRAP) || openfile->current_y == openfile->current->lineno - openfile->edittop->lineno);
/* Move the current line of the edit window down. */
openfile->current = openfile->current->next;
openfile->current_x = actual_x(openfile->current->data,
openfile->placewewant);
if (ISSET(SOFTWRAP)) {
if (openfile->current->lineno - openfile->edittop->lineno >= maxrows)
onlastline = TRUE;
}
/* If scroll_only is FALSE and if we're on the first line of the
* edit window, scroll the edit window down one line if we're in
* smooth scrolling mode, or down half a page if we're not. If
* scroll_only is TRUE, scroll the edit window down one line
* unconditionally. */
if (onlastline || openfile->current_y == editwinrows - 1
#ifndef NANO_TINY
|| scroll_only
#endif
) {
edit_scroll(DOWN_DIR,
#ifndef NANO_TINY
(ISSET(SMOOTH_SCROLL) || scroll_only) ? 1 :
#endif
editwinrows / 2 + 1);
edit_refresh_needed = TRUE;
}
/* If we're above the last line of the edit window, update the line
* we were on before and the line we're on now. The former needs to
* be redrawn if we're not on the first page, and the latter needs
* to be drawn unconditionally. */
if (ISSET(SOFTWRAP) || openfile->current_y < editwinrows - 1) {
if (need_vertical_update(0))
update_line(openfile->current->prev, 0);
update_line(openfile->current, openfile->current_x);
}
}
/* If scroll_only is FALSE, move up one line. If scroll_only is TRUE,
* scroll up one line without scrolling the cursor. */
void do_up(
#ifndef NANO_TINY
bool scroll_only
#else
void
#endif
)
{
/* If we're at the top of the file, or if scroll_only is TRUE and
* the top of the file is onscreen, get out. */
if (openfile->current == openfile->fileage
#ifndef NANO_TINY
|| (scroll_only && openfile->edittop == openfile->fileage)
#endif
)
return;
assert(ISSET(SOFTWRAP) || openfile->current_y == openfile->current->lineno - openfile->edittop->lineno);
/* Move the current line of the edit window up. */
openfile->current = openfile->current->prev;
openfile->current_x = actual_x(openfile->current->data,
openfile->placewewant);
/* If scroll_only is FALSE and if we're on the first line of the
* edit window, scroll the edit window up one line if we're in
* smooth scrolling mode, or up half a page if we're not. If
* scroll_only is TRUE, scroll the edit window up one line
* unconditionally. */
if (openfile->current_y == 0 || (ISSET(SOFTWRAP) && openfile->edittop->lineno == openfile->current->next->lineno)
#ifndef NANO_TINY
|| scroll_only
#endif
)
edit_scroll(UP_DIR,
#ifndef NANO_TINY
(ISSET(SMOOTH_SCROLL) || scroll_only) ? 1 :
#endif
editwinrows / 2 + 1);
/* If we're below the first line of the edit window, update the
* line we were on before and the line we're on now. The former
* needs to be redrawn if we're not on the first page, and the
* latter needs to be drawn unconditionally. */
if (openfile->current_y > 0) {
if (need_vertical_update(0))
update_line(openfile->current->next, 0);
update_line(openfile->current, openfile->current_x);
}
}
/* If scroll_only is FALSE, move down one line. If scroll_only is TRUE,
* scroll down one line without scrolling the cursor. */
void do_down(
#ifndef NANO_TINY
bool scroll_only
#else
void
#endif
)
{
#ifndef NANO_TINY
int amount = 0, enough;
filestruct *topline;
#endif
/* If we're at the bottom of the file, get out. */
if (openfile->current == openfile->filebot || !openfile->current->next)
return;
assert(ISSET(SOFTWRAP) || openfile->current_y == openfile->current->lineno - openfile->edittop->lineno);
/* Move the current line of the edit window down. */
openfile->current = openfile->current->next;
openfile->current_x = actual_x(openfile->current->data,
openfile->placewewant);
#ifndef NANO_TINY
if (ISSET(SOFTWRAP)) {
/* Compute the amount to scroll. */
amount = (strlenpt(openfile->current->data) / COLS + openfile->current_y + 2
+ strlenpt(openfile->current->prev->data) / COLS - editwinrows);
topline = openfile->edittop;
/* Reduce the amount when there are overlong lines at the top. */
for (enough = 1; enough < amount; enough++) {
if (amount <= strlenpt(topline->data) / COLS) {
amount = enough;
break;
}
amount -= strlenpt(topline->data) / COLS;
topline = topline->next;
}
}
#endif
/* If scroll_only is FALSE and if we're on the last line of the
* edit window, scroll the edit window down one line if we're in
* smooth scrolling mode, or down half a page if we're not. If
* scroll_only is TRUE, scroll the edit window down one line
* unconditionally. */
if (openfile->current_y == editwinrows - 1
#ifndef NANO_TINY
|| amount > 0 || scroll_only
#endif
) {
#ifndef NANO_TINY
if (amount < 1 || scroll_only)
amount = 1;
#endif
edit_scroll(DOWNWARD,
#ifndef NANO_TINY
(ISSET(SMOOTH_SCROLL) || scroll_only) ? amount :
#endif
editwinrows / 2 + 1);
edit_refresh_needed = TRUE;
}
/* If we're above the last line of the edit window, update the line
* we were on before and the line we're on now. The former needs to
* be redrawn if we're not on the first page, and the latter needs
* to be drawn unconditionally. */
if (openfile->current_y < editwinrows - 1
#ifndef NANO_TINY
|| ISSET(SOFTWRAP)
#endif
) {
if (need_screen_update(0))
update_line(openfile->current->prev, 0);
update_line(openfile->current, openfile->current_x);
}
}
/* If scroll_only is FALSE, move down one line. If scroll_only is TRUE,
* scroll down one line without scrolling the cursor. */
void do_down(bool scroll_only)
{
#ifndef NANO_TINY
int amount = 0, enough;
filestruct *topline;
#endif
size_t was_column = xplustabs();
/* If we're at the bottom of the file, get out. */
if (openfile->current == openfile->filebot)
return;
assert(ISSET(SOFTWRAP) || openfile->current_y ==
openfile->current->lineno - openfile->edittop->lineno);
assert(openfile->current->next != NULL);
#ifndef NANO_TINY
if (ISSET(SOFTWRAP)) {
/* Compute the number of lines to scroll. */
amount = strlenpt(openfile->current->data) / editwincols -
xplustabs() / editwincols +
strlenpt(openfile->current->next->data) / editwincols +
openfile->current_y - editwinrows + 2;
topline = openfile->edittop;
/* Reduce the amount when there are overlong lines at the top. */
for (enough = 1; enough < amount; enough++) {
amount -= strlenpt(topline->data) / editwincols;
if (amount > 0)
topline = topline->next;
if (amount < enough) {
amount = enough;
break;
}
}
}
#endif
/* Move to the next line in the file. */
openfile->current = openfile->current->next;
openfile->current_x = actual_x(openfile->current->data,
openfile->placewewant);
/* If scroll_only is FALSE and if we're on the last line of the
* edit window, scroll the edit window down one line if we're in
* smooth scrolling mode, or down half a page if we're not. If
* scroll_only is TRUE, scroll the edit window down one line
* unconditionally. */
#ifndef NANO_TINY
if (openfile->current_y == editwinrows - 1 || amount > 0 || scroll_only) {
if (amount < 1 || scroll_only)
amount = 1;
edit_scroll(DOWNWARD, (ISSET(SMOOTH_SCROLL) || scroll_only) ?
amount : editwinrows / 2 + 1);
if (ISSET(SOFTWRAP)) {
refresh_needed = TRUE;
return;
}
}
#else
if (openfile->current_y == editwinrows - 1)
edit_scroll(DOWNWARD, editwinrows / 2 + 1);
#endif
/* If the lines weren't already redrawn, see if they need to be. */
if (openfile->current_y < editwinrows - 1) {
/* Redraw the prior line if it was horizontally scrolled. */
if (need_horizontal_scroll(was_column, 0))
update_line(openfile->current->prev, 0);
/* Redraw the current line if it needs to be horizontally scrolled. */
if (need_horizontal_scroll(0, xplustabs()))
update_line(openfile->current, openfile->current_x);
}
}
