1 files changed, 133 insertions, 0 deletions
diff --git a/tui/widget/list/scrolllist.ha b/tui/widget/list/scrolllist.ha
new file mode 100644
index 0000000..5ffa70f
--- /dev/null
+++ b/tui/widget/list/scrolllist.ha
@@ -0,0 +1,133 @@
+use tui;
+use tui::widget;
+use io;
+use unix::tty;
+use memio;
+use strings;
+
+export type scrolllist = struct {
+	widget: widget::widget,
+	items: []str,
+	frame: frame,
+	cursor: u16,
+};
+
+// 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 =>
+		yield if (tsz.rows < sz.rows) tsz.rows else sz.rows;
+	case void =>
+		yield tsz.rows;
+	};
+
+	if (end > len(items)) {
+		end = len(items): u16;
+	};
+
+	return scrolllist {
+		widget = widget::widget {
+			state = state,
+			print = &printscrolllist,
+			resize = &resizescrolllist,
+			finish = &finishscrolllist,
+			pos = pos,
+			sz = sz,
+			style = style,
+			damage = widget::all,
+			...
+		},
+		items = items,
+		frame = frame {
+			start = 0,
+			end = end,
+		},
+		cursor = 0u16,
+	};
+};
+
+fn printscrolllist(widget: *widget::widget) void = {
+	const list = widget: *scrolllist;
+	let st = memio::dynamic();
+	defer io::close(&st)!;
+	for (let i = list.frame.start; i < list.frame.end; i += 1) {
+		//let item = match (list.widget.sz) {
+		//case let sz: tty::ttysize =>
+		//	yield strings::sub(list.items[i], 0z, sz.columns);
+		//case widget::nosize =>
+		//	yield list.items[i];
+		//};
+		//memio::concat(&st, item)!;
+		if (i == list.cursor) {
+			memio::concat(&st, "\x1B[7m")!;
+		};
+		memio::concat(&st, list.items[i])!;
+		if (i == list.cursor) {
+			memio::concat(&st, "\x1B[27m")!;
+		};
+		if (i != list.frame.end - 1) {
+			memio::concat(&st, "\n")!;
+		};
+	};
+	list.widget.buf = memio::string(&st)!;
+	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) - 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)) {
+		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): u16 - 1;
+	li.frame.end = len(li.items): u16;
+	li.frame.start = len(li.items): u16 - sz;
+};