static void screen_scroll_down(struct tsm_screen *con, unsigned int num)
{
unsigned int i, j, max;
if (!num)
return;
max = con->margin_bottom + 1 - con->margin_top;
if (num > max)
num = max;
/* see screen_scroll_up() for an explanation */
if (num > 128) {
screen_scroll_down(con, 128);
return screen_scroll_down(con, num - 128);
}
struct line *cache[num];
for (i = 0; i < num; ++i) {
cache[i] = con->lines[con->margin_bottom - i];
for (j = 0; j < con->size_x; ++j)
cell_init(con, &cache[i]->cells[j]);
}
if (num < max) {
memmove(&con->lines[con->margin_top + num],
&con->lines[con->margin_top],
(max - num) * sizeof(struct line*));
}
memcpy(&con->lines[con->margin_top],
cache, num * sizeof(struct line*));
}
SHL_EXPORT
void tsm_screen_move_up(struct tsm_screen *con, unsigned int num,
bool scroll)
{
unsigned int diff, size;
if (!con || !num)
return;
screen_inc_age(con);
if (con->cursor_y >= con->margin_top)
size = con->margin_top;
else
size = 0;
diff = con->cursor_y - size;
if (num > diff) {
num -= diff;
if (scroll)
screen_scroll_down(con, num);
move_cursor(con, con->cursor_x, size);
} else {
move_cursor(con, con->cursor_x, con->cursor_y - num);
}
}
void tsm_screen_scroll_down(struct tsm_screen *con, unsigned int num)
{
if (!con || !num)
return;
screen_scroll_down(con, num);
}
static void
screen_page_down(Screen *s)
{
int i = 0;
for (i = 0; i < lines(s); ++i) {
screen_scroll_down(s);
}
}
static void screen_scroll_down(struct tsm_screen *con, unsigned int num)
{
unsigned int i, j, max;
if (!num)
return;
/* TODO: more sophisticated ageing */
con->age = con->age_cnt;
max = con->margin_bottom + 1 - con->margin_top;
if (num > max)
num = max;
/* see screen_scroll_up() for an explanation */
if (num > 128) {
screen_scroll_down(con, 128);
return screen_scroll_down(con, num - 128);
}
struct line *cache[num];
for (i = 0; i < num; ++i) {
cache[i] = con->lines[con->margin_bottom - i];
for (j = 0; j < con->size_x; ++j)
screen_cell_init(con, &cache[i]->cells[j]);
}
if (num < max) {
memmove(&con->lines[con->margin_top + num],
&con->lines[con->margin_top],
(max - num) * sizeof(struct line*));
}
memcpy(&con->lines[con->margin_top],
cache, num * sizeof(struct line*));
if (con->sel_active) {
if (!con->sel_start.line && con->sel_start.y >= 0)
con->sel_start.y += num;
if (!con->sel_end.line && con->sel_end.y >= 0)
con->sel_end.y += num;
}
}
SHL_EXPORT
void tsm_screen_scroll_down(struct tsm_screen *con, unsigned int num)
{
if (!con || !num)
return;
screen_inc_age(con);
screen_scroll_down(con, num);
}
/* Read the key press using ncurses, and perform the requested action */
void
ScreenHandleInput(Screen *s)
{
/* this is non-blocking */
int c = getch();
switch(c)
{
case KEY_UP:
screen_scroll_up(s);
break;
case KEY_DOWN:
screen_scroll_down(s);
break;
case KEY_LEFT:
screen_scroll_left(s);
break;
case KEY_RIGHT:
screen_scroll_right(s);
break;
case KEY_NPAGE:
screen_page_down(s);
break;
case KEY_HOME:
screen_home(s);
break;
case KEY_END:
screen_end(s);
break;
case KEY_PPAGE:
screen_page_up(s);
break;
case KEY_RESIZE:
break;
case 9: /* TAB */
screen_next_col(s);
break;
case 353: /* SHIFT+TAB */
screen_prev_col(s);
break;
case 'p':
screen_toggle_pause(s);
break;
case ERR:
break;
default:
break;
}
ScreenUpdate(s);
}
void tsm_screen_move_up(struct tsm_screen *con, unsigned int num,
bool scroll)
{
unsigned int diff, size;
if (!con || !num)
return;
if (con->cursor_y >= con->margin_top)
size = con->margin_top;
else
size = 0;
diff = con->cursor_y - size;
if (num > diff) {
num -= diff;
if (scroll)
screen_scroll_down(con, num);
con->cursor_y = size;
} else {
con->cursor_y -= num;
}
}
