Add new setsize api to widget and better size support for list

This adds a distinction between the list size (list.sz) and the list's
frame size (list.frame.sz). This commit also adds the widget::setsize
api and implements it for list.

1 files changed, 3 insertions, 0 deletions

diff --git a/libtui/widget/widget.ha b/libtui/widget/widget.ha
index 6875692..307378d 100644
--- a/libtui/widget/widget.ha
+++ b/libtui/widget/widget.ha
@@ -13,6 +13,8 @@ export type print = fn(w: *widget) (void | error);
 // A function that frees the resources associated to the widget.
 export type finish = fn(w: *widget) void;
 
+export type setsize = fn(w: *widget, sz: tty::ttysize) void;
+
 // An input listener on a widget. The returning value is intended to be used as
 // a signal that will be returned by [[notify]] in order to trigger certain more
 // global ui events (terminate the program, change widget focus, etc.). To
@@ -53,6 +55,7 @@ export type listener = *fn(w: *widget, r: libtui::key) bool;
 export type widget = struct {
 	print: nullable *print,
 	finish: nullable *finish,
+	setsize: nullable *setsize,
 	listeners: []listener,
 	ui: libtui::ttyui,
 };