应用内通知

const notifier = try ui.widgets.Notifier.init(scope, cx, .{
    .position = .bottom_center,
    // Keep the stack clear of a 56px toolbar.
    .content_insets = .{ .top = 56 },
    .max_visible = 4,
});

// Success: auto-dismisses after 3.6 s.
_ = try notifier.show(.{
    .tone = .success,
    .title = "Saved to iCloud",
    .body = "3 files synced · 2.1 MB",
});

// Error with two actions: errors stay until the user acts.
const failed = try notifier.show(.{
    .tone = .@"error",
    .title = "Upload failed",
    .body = "network timeout · dist/app.zip",
    .actions = &.{
        .{ .label = "Retry", .primary = true, .tag = "retry" },
        .{ .label = "View log", .tag = "log" },
    },
});

// Undo: a 7 s countdown ring and a default "Undo" button.
_ = try notifier.show(.{
    .kind = .undo,
    .title = "Moved 4 items to the Trash",
    .body = "You can undo this for 7 seconds.",
});

// A person's message with an inline reply box.
_ = try notifier.show(.{
    .tone = .violet,
    .avatar = "L",
    .title = "Lin",
    .body = "I finished the table widths in section three.",
    .reply = true,
});

const id = try notifier.show(.{
    .kind = .progress,
    .title = "Uploading attachment",
    .body = "assets/hero-shot.png",
    .progress = .{ .value = 0, .label = "Uploading · about 5 s", .count = "0 / 5" },
});

// Each tick: only the progress layer is touched, the card isn't rebuilt.
notifier.setProgress(id, 0.6, "Uploading · about 2 s", "3 / 5");

// Done: the same card turns into a success card in place —
// no new entrance, and it now dismisses itself after 3.4 s.
try notifier.update(id, .{
    .tone = .success,
    .title = "Upload complete",
    .body = "assets/hero-shot.png",
    .duration_ms = 3400,
});

const Uploads = struct {
    fn onEvent(ctx: ?*anyopaque, n: *ui.widgets.Notifier, e: ui.widgets.NotificationEvent) void {
        const self: *Uploads = @ptrCast(@alignCast(ctx orelse return));
        switch (e.kind) {
            .action => if (std.mem.eql(u8, e.tag, "retry")) {
                // Turn the sticky error card into a progress card in place.
                n.update(e.id, .{
                    .kind = .progress,
                    .title = "Retrying upload",
                    .progress = .{ .value = 0, .label = "Uploading", .count = "0 / 5" },
                }) catch return;
                self.restart(e.id);
            } else n.dismiss(e.id),
            .reply => self.send(e.text),
            .undo => self.restoreTrash(),
            .dismissed, .expired => {},
        }
    }
    // …restart / send / restoreTrash
};

const uploads = try cx.bindState(Uploads, .{});
notifier.setListener(.{ .context = @ptrCast(uploads), .callback = Uploads.onEvent });