Notification

pub fn build(scope: *ui.Scope, cx: *ui.Cx) anyerror!*ui.Node {
    const t = cx.tokens;
    const root = try ui.box(cx, .{ .width = .{ .grow = .{} }, .direction = .column, .gap = 12 }, .{});

    const n = try Notifier.init(scope, cx, .{
        .position = .bottom_center,
        // storybook 顶部 56px 工具栏。
        .content_insets = .{ .top = 56 },
        .strings = zh_strings,
    });
    const status = try ui.text(cx, "event · idle", .{ .font_size = 12, .font_weight = 550, .color = t.color.fg_secondary });
    status.meta.ownership.meta.test_id = "story.notify.status";
    // 第二个实例：固定下中，只放文案提示；与主实例各自独立堆叠 / 悬停 / 清除。
    const hints_n = try Notifier.init(scope, cx, .{
        .position = .bottom_center,
        .content_insets = .{ .top = 56 },
        .strings = zh_strings,
    });
    const state = try cx.bindState(Story, .{ .n = n, .hints_n = hints_n, .cx = cx, .status = status });
    n.setListener(.{ .context = @ptrCast(state), .callback = Story.onEvent });
    hints_n.setListener(.{ .context = @ptrCast(state), .callback = Story.onEvent });
    root.meta.per_frame.hooks.slots.anim_state = @ptrCast(state);
    root.meta.per_frame.hooks.before_render.main = storyHook;

    const kinds = try controlRow(cx);
    try addButton(scope, cx, kinds, state, "成功 Success", "story.notify.btn.success", Story.success, .secondary);
    try addButton(scope, cx, kinds, state, "错误 Error", "story.notify.btn.error", Story.failure, .secondary);
    try addButton(scope, cx, kinds, state, "警告 Warning", "story.notify.btn.warning", Story.warning, .secondary);
    try addButton(scope, cx, kinds, state, "进行中 Progress", "story.notify.btn.progress", Story.progress, .secondary);
    try addButton(scope, cx, kinds, state, "需要操作 Action", "story.notify.btn.action", Story.action, .secondary);
    try addButton(scope, cx, kinds, state, "人员消息 Person", "story.notify.btn.person", Story.person, .secondary);
    try addButton(scope, cx, kinds, state, "撤销 Undo", "story.notify.btn.undo", Story.undo, .secondary);
    try addButton(scope, cx, kinds, state, "静默 Quiet", "story.notify.btn.quiet", Story.quiet, .secondary);
    try addButton(scope, cx, kinds, state, "汇总 Digest", "story.notify.btn.digest", Story.digest, .secondary);
    try root.appendChild(cx.allocator, try group(cx, try sectionLabel(cx, "九种类型 Nine kinds", "卡片 392 宽 · 圆角 18 · 液态玻璃；按钮在分隔线下方，中性灰底不上色。"), kinds));

    const hints = try controlRow(cx);
    try addButton(scope, cx, hints, state, "纯文案", "story.notify.hint.btn.plain", Story.hintPlain, .secondary);
    try addButton(scope, cx, hints, state, "成功", "story.notify.hint.btn.success", Story.hintSuccess, .secondary);
    try addButton(scope, cx, hints, state, "失败", "story.notify.hint.btn.error", Story.hintError, .secondary);
    try addButton(scope, cx, hints, state, "键帽", "story.notify.hint.btn.keycap", Story.hintKeycap, .secondary);
    try addButton(scope, cx, hints, state, "进行中 → 成功", "story.notify.hint.btn.loading", Story.hintLoading, .secondary);
    try addButton(scope, cx, hints, state, "可撤销", "story.notify.hint.btn.undo", Story.hintUndo, .secondary);
    try addButton(scope, cx, hints, state, "超长截断", "story.notify.hint.btn.long", Story.hintLong, .secondary);
    try root.appendChild(cx.allocator, try group(cx, try sectionLabel(cx, "文案提示 Text Toast", "36 高玻璃胶囊 · 与卡片同一个堆叠（折叠、悬停展开、横扫关闭）· 宽度随内容，最大 480。"), hints));

    const dual = try controlRow(cx);
    try addButton(scope, cx, dual, state, "卡片 → 右上（主实例）", "story.notify.dual.btn.card", Story.dualCards, .secondary);
    try addButton(scope, cx, dual, state, "提示 → 下中（第二实例）", "story.notify.dual.btn.hint", Story.dualHint, .secondary);
    try addButton(scope, cx, dual, state, "可撤销提示 → 下中", "story.notify.dual.btn.undo", Story.dualHintUndo, .secondary);
    try root.appendChild(cx.allocator, try group(cx, try sectionLabel(cx, "双实例 Two notifiers", "卡片要停右上、提示要停下中：建两个 Notifier。各自独立堆叠、悬停暂停与「全部清除」。"), dual));

    const stack = try controlRow(cx);
    try addButton(scope, cx, stack, state, "连发 4 条", "story.notify.btn.burst", Story.burst, .primary);
    try addButton(scope, cx, stack, state, "全部收起", "story.notify.btn.clear", Story.clear, .ghost);
    try stack.appendChild(cx.allocator, status);
    try root.appendChild(cx.allocator, try group(cx, try sectionLabel(cx, "堆叠 Stack", "折叠露边 9px · 悬停展开并暂停所有计时 · 删除中间一条平滑补位。"), stack));

    const pos = try controlRow(cx);
    try addButton(scope, cx, pos, state, "上左", "story.notify.pos.tl", Story.posTL, .secondary);
    try addButton(scope, cx, pos, state, "上中", "story.notify.pos.tc", Story.posTC, .secondary);
    try addButton(scope, cx, pos, state, "上右", "story.notify.pos.tr", Story.posTR, .secondary);
    try addButton(scope, cx, pos, state, "右中", "story.notify.pos.rc", Story.posRC, .secondary);
    try addButton(scope, cx, pos, state, "右下", "story.notify.pos.br", Story.posBR, .secondary);
    try addButton(scope, cx, pos, state, "下中", "story.notify.pos.bc", Story.posBC, .secondary);
    try addButton(scope, cx, pos, state, "下左", "story.notify.pos.bl", Story.posBL, .secondary);
    try addButton(scope, cx, pos, state, "左中", "story.notify.pos.lc", Story.posLC, .secondary);
    try root.appendChild(cx.allocator, try group(cx, try sectionLabel(cx, "八个停靠位置 Positions", "位置只改锚点、增长方向、入场位移方向；切换不重建卡片。"), pos));

    // 玻璃需要有内容的背景才看得出来：模拟卡片身后的正文（设计稿里提醒浮在编辑器正文上）。
    const backdrop = try ui.box(cx, .{ .width = .{ .grow = .{} }, .direction = .column, .gap = 0 }, .{});
    backdrop.meta.ownership.meta.test_id = "story.notify.backdrop";
    const tints = [_]u24{ 0xE4572E, 0x17BEBB, 0xFFC914, 0x2E282A, 0x76B041, 0x8059BB };
    var li: usize = 0;
    while (li < 36) : (li += 1) {
        const line = try ui.box(cx, .{ .width = .{ .grow = .{} }, .height = .{ .px = 22 }, .direction = .row, .gap = 28, .padding = ui.Padding.symmetric(0, 12), .align_items = .center, .background = ui.arb.hex(tints[li % tints.len]) }, .{});
        var k: usize = 0;
        while (k < 6) : (k += 1) try line.appendChild(cx.allocator, try ui.text(cx, "The foundation of any great editor", .{ .font_size = 13, .color = ui.arb.hex(0xFFFFFF) }));
        try backdrop.appendChild(cx.allocator, line);
    }
    try root.appendChild(cx.allocator, backdrop);

    if (!n.portaled) try root.appendChild(cx.allocator, n.container);
    if (!hints_n.portaled) try root.appendChild(cx.allocator, hints_n.container);
    return root;
}