init

pub fn init(self: *TreeWidget, src: std.builtin.SourceLocation, init_opts: InitOptions, opts: Options) void {
    self.* = .{};
    const defaults = Options{ .name = "Tree", .role = .tree };
    self.init_options = init_opts;
    self.wd = WidgetData.init(src, .{}, defaults.override(opts));
    self.id_branch = dvui.dataGet(null, self.wd.id, "_id_branch", usize) orelse null;
    self.drag_point = dvui.dataGet(null, self.wd.id, "_drag_point", dvui.Point.Physical) orelse null;
    self.branch_size = dvui.dataGet(null, self.wd.id, "_branch_size", dvui.Size) orelse dvui.Size{};
    if (init_opts.drag_name) |dn| {
        if (self.drag_point != null and !dvui.dragName(dn)) {
            self.drag_ending = true;
        }
    }

    self.data().register();
    self.data().borderAndBackground(.{});

    dvui.parentSet(self.widget());

    self.group.init(@src(), .{ .nav_key_dir = .vertical }, .{});

    if (self.group.data().accesskit_node()) |ak_node| {
        AccessKit.nodeAddAction(ak_node, AccessKit.Action.focus);
        AccessKit.nodeAddAction(ak_node, AccessKit.Action.click);
    }
}