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use tui;
use tui::widget;
use io;
use unix::tty;
use memio;
use strings;
use fmt;
export type scrolllist = struct {
widget: widget::widget,
items: []str,
frame: frame,
cursor: int,
};
// Return an instance of list. out is the tty file, pos the starting position,
// sz is the size of the widget (if void is used, the maximum possible
// size is used), items is the slice of items of the list.
export fn newscrolllist(state: *tui::tui, pos: widget::coords, sz: widget::widgetsize,
style: (*widget::style | void), items: str...) (scrolllist | tty::error) = {
const tsz = tty::winsize(state.out)?;
let end = match (sz) {
case let sz: tty::ttysize =>
const rows = if (tsz.rows < sz.rows) tsz.rows - 1 else sz.rows;
yield rows;
case void =>
yield tsz.rows - 1;
};
let end = end: int;
if (end > len(items): int) {
end = len(items): int;
};
return scrolllist {
widget = widget::widget {
state = state,
print = &printscrolllist,
resize = &resizescrolllist,
finish = &finishscrolllist,
pos = pos,
sz = sz,
style = style,
damage = widget::damageall,
...
},
items = items,
frame = frame {
start = 0,
end = end,
},
cursor = 0,
};
};
fn printscrolllist(widget: *widget::widget) void = {
const list = widget: *scrolllist;
assert(list.frame.start >= 0);
assert(list.frame.end <= len(list.items): int);
list.widget.buf = widget::linesbuf {
lines = list.items[list.frame.start..list.frame.end],
styles = &stylesscrolllist,
};
widget::print(list);
};
fn resizescrolllist(widget: *widget::widget, ttysize: tty::ttysize) void = {
return;
};
fn finishscrolllist(widget: *widget::widget) void = {
widget::finish(widget);
};
export fn down(li: *scrolllist) void = {
if (li.cursor == li.frame.end - 1) {
framedown(li);
};
if (li.cursor < len(li.items): int - 1) {
li.cursor += 1;
};
};
export fn up(li: *scrolllist) void = {
if (li.cursor == li.frame.start) {
frameup(li);
};
if (li.cursor > 0) {
li.cursor -= 1;
};
};
export fn frameup(li: *scrolllist) void = {
if (li.frame.start > 0) {
li.frame.start -= 1;
li.frame.end -= 1;
};
};
export fn framedown(li: *scrolllist) void = {
if (li.frame.end < len(li.items): int) {
li.frame.start += 1;
li.frame.end += 1;
};
};
export fn top(li: *scrolllist) void = {
const sz = li.frame.end - li.frame.start;
li.cursor = 0;
li.frame.end = sz;
li.frame.start = 0;
};
export fn bottom(li: *scrolllist) void = {
const sz = li.frame.end - li.frame.start;
li.cursor = len(li.items): int - 1;
li.frame.end = len(li.items): int;
li.frame.start = len(li.items): int - sz;
};
export fn setcursor(li: *scrolllist, newpos: int) void = {
li.cursor = newpos;
reframe(li);
};
fn reframe(li: *scrolllist) void = {
if (li.cursor > li.frame.end) {
const diff = li.frame.end - li.frame.start;
li.frame.start = if (li.cursor <= len(li.items): int - diff) li.cursor else len(li.items): int - diff;
li.frame.end = if (li.frame.start + diff > len(li.items): int) {
yield len(li.items): int;
} else {
yield li.frame.start + diff;
};
} else if (li.cursor < li.frame.start) {
const diff = li.frame.end - li.frame.start;
li.frame.end = if (li.cursor > diff) li.cursor else diff;
li.frame.start = if (li.frame.end - diff < 0) {
yield 0;
} else {
yield li.frame.end - diff;
};
};
assert(li.frame.start >= 0);
assert(li.frame.end <= len(li.items): int);
};
fn stylesscrolllist(widget: *widget::widget, txt: str, idx: size) str = {
const list = widget: *scrolllist;
const idx = idx: int + list.frame.start;
let st = memio::dynamic();
defer io::close(&st)!;
if (idx == list.cursor) {
memio::concat(&st, "\x1B[7m")!;
};
memio::concat(&st, txt)!;
if (idx == list.cursor) {
memio::concat(&st, "\x1B[27m")!;
};
return strings::dup(memio::string(&st)!);
};
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