imgui
#[must_use] pub struct TreeNode<'ui, 'p> { // some fields omitted }
impl<'ui, 'p> TreeNode<'ui, 'p>
fn new(id: ImStr<'p>) -> Self
fn label(self, label: ImStr<'p>) -> Self
fn opened(self, opened: bool, cond: ImGuiSetCond) -> Self
fn build<F: FnOnce()>(self, f: F)