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::{App, Bounds, Context, Window, WindowBounds, WindowOptions, div, prelude::*, px, size};
 6use gpui_platform::application;
 7
 8struct Tree {}
 9
10static DEPTH: LazyLock<u64> = LazyLock::new(|| {
11    std::env::var("GPUI_TREE_DEPTH")
12        .ok()
13        .and_then(|depth| depth.parse().ok())
14        .unwrap_or_else(|| 50)
15});
16
17impl Render for Tree {
18    fn render(&mut self, _: &mut Window, _: &mut Context<Self>) -> impl IntoElement {
19        let mut depth = *DEPTH;
20        static COLORS: [gpui::Hsla; 4] = [gpui::red(), gpui::blue(), gpui::green(), gpui::yellow()];
21        let mut colors = COLORS.iter().cycle().copied();
22        let mut next_div = || div().p_0p5().bg(colors.next().unwrap());
23        let mut innermost_node = next_div();
24        while depth > 0 {
25            innermost_node = next_div().child(innermost_node);
26            depth -= 1;
27        }
28        innermost_node
29    }
30}
31
32fn main() {
33    application().run(|cx: &mut App| {
34        let bounds = Bounds::centered(None, size(px(300.0), px(300.0)), cx);
35        cx.open_window(
36            WindowOptions {
37                window_bounds: Some(WindowBounds::Windowed(bounds)),
38                ..Default::default()
39            },
40            |_, cx| cx.new(|_| Tree {}),
41        )
42        .unwrap();
43    });
44}