像 Web 一样开发，
由 GPU 原生绘制

const std = @import("std");const ui = @import("ui");const App = @import("zenit_app").App; /// 样式表：具名纯函数 + 应用层自定义 recipe，与业务逻辑分离。const S = @import("styles.zig"); const Counter = struct {    n: u32 = 0,    label: ?*ui.Node = null,    buf: [32]u8 = undefined,     pub fn increment(self: *Counter) void {        self.n += 1;        const node = self.label orelse return;        const content = std.fmt.bufPrint(&self.buf, "Clicked {d} times", .{self.n}) catch return;        if (node.getText()) |old| {            var t = old;            t.content = content;            node.setText(t);        }        node.markRenderDirty();    }}; fn mountUI(cx: *ui.Cx, scope: *ui.Scope) anyerror!*ui.Node {    const allocator = cx.allocator;     const counter = try cx.bindState(Counter, .{});    const click = cx.on(Counter, counter, Counter.increment);     const root = try ui.boxStyled(cx, S.root, .{});     try root.appendChild(allocator, try ui.textStyled(cx, S.title, "Hello, zenit!"));     try root.appendChild(allocator, try ui.widgets.Button(.{        .label = "Click me",        .variant = .primary,        .size = .md,        .on_click = click,    }).mount(scope, cx));     // 应用层自定义 recipe（styles.zig 的 PanelRecipe）包住计数文本    const panel = try ui.boxStyled(cx, S.panel(.highlight), .{});    const label = try ui.textStyled(cx, S.counterLabel, "Clicked 0 times");    try panel.appendChild(allocator, label);    try root.appendChild(allocator, panel);    counter.label = label;     return root;} pub fn main() !void {    var gpa = std.heap.GeneralPurposeAllocator(.{}){};    defer _ = gpa.deinit();     const app = try App.init(gpa.allocator(), .{        .window = .{ .width = 640, .height = 480, .title = "Hello Button" },    });    defer app.deinit();     try app.runWith(mountUI);}