1//! Renders a div with deep children hierarchy. This example is useful to exemplify that Zed can
 2//! handle deep hierarchies (even though it cannot just yet!).
 3use std::sync::LazyLock;
 4
 5use gpui::{
 6    App, Application, Bounds, Context, Window, WindowBounds, WindowOptions, div, prelude::*, px,
 7    size,
 8};
 9
10struct Tree {}
11
12static DEPTH: LazyLock<u64> = LazyLock::new(|| {
13    std::env::var("GPUI_TREE_DEPTH")
14        .ok()
15        .and_then(|depth| depth.parse().ok())
16        .unwrap_or_else(|| 50)
17});
18
19impl Render for Tree {
20    fn render(&mut self, _: &mut Window, _: &mut Context<Self>) -> impl IntoElement {
21        let mut depth = *DEPTH;
22        static COLORS: [gpui::Hsla; 4] = [gpui::red(), gpui::blue(), gpui::green(), gpui::yellow()];
23        let mut colors = COLORS.iter().cycle().copied();
24        let mut next_div = || div().p_0p5().bg(colors.next().unwrap());
25        let mut innermost_node = next_div();
26        while depth > 0 {
27            innermost_node = next_div().child(innermost_node);
28            depth -= 1;
29        }
30        innermost_node
31    }
32}
33
34fn main() {
35    Application::new().run(|cx: &mut App| {
36        let bounds = Bounds::centered(None, size(px(300.0), px(300.0)), cx);
37        cx.open_window(
38            WindowOptions {
39                window_bounds: Some(WindowBounds::Windowed(bounds)),
40                ..Default::default()
41            },
42            |_, cx| cx.new(|_| Tree {}),
43        )
44        .unwrap();
45    });
46}