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use nsh_base::{nav_page, nav_stack};
use nsh_core::prelude::*;

#[derive(Debug, Clone, PartialEq)]
enum Route {
    Inbox,
    Message(u32),
}

/// The page's header on the desktops and the web; iOS and Android show the system's, from `title`.
fn header(routes: Signal<Vec<Route>>, title: &'static str) -> impl IntoElement {
    view()
        .h(px(48.0))
        .flex_row()
        .items_center()
        .gap_3()
        .border_b_1()
        .border_color(rgb(0xe5e7eb))
        .px_4()
        .child(when(
            move || routes.with(|r| r.len() > 1),
            move || {
                text("Back")
                    .role(AccessibilityRole::Button)
                    .on_press(move || routes.update(|r| { r.pop(); }))
                    .text_color(rgb(0x2563eb))
                    .active(|s| s.opacity(0.6))
            },
        ))
        .child(text(title).text_size(px(17.0)).font_weight(FontWeight::SEMIBOLD))
}

fn inbox(routes: Signal<Vec<Route>>) -> Screen {
    nav_page()
        .title("Inbox")
        .header(header(routes, "Inbox"))
        .child(scroll().flex_1().children((1..=5).map(move |id| {
            view()
                .on_press(move || routes.update(|r| r.push(Route::Message(id))))
                .p_4()
                .active(|s| s.bg(rgb(0xf3f4f6)))
                .child(text(format!("Message {id}")))
        })))
}

fn message(routes: Signal<Vec<Route>>, id: u32) -> Screen {
    nav_page()
        .title(format!("Message {id}"))
        .header(header(routes, "Message"))
        .child(view().flex_1().p(px(16.0)).child(text(format!("The body of message {id}."))))
}

#[component]
pub fn App() -> impl IntoElement {
    let routes = signal(vec![Route::Inbox]);
    nav_stack().flex_1().child(each(
        move || routes.get(),
        |route: &Route| format!("{route:?}"),
        move |route, index| {
            let page = match route.get_untracked() {
                Route::Inbox => inbox(routes),
                Route::Message(id) => message(routes, id),
            };
            // The user went back natively: drop the route (and those above it).
            page.on_dismiss(move || routes.update(|r| r.truncate(index.get_untracked())))
        },
    ))
}

import { mount, Scroll, Text, View } from "nsh";
import { createNavStack, NavPage, NavStack } from "nsh/base";

type Route = { name: "inbox" } | { name: "message"; id: number };

const nav = createNavStack<Route>([{ name: "inbox" }]);

// The page's header on the desktops and the web; iOS and Android show the system's, from `title`.
function Header(props: { title: string }) {
  return (
    <View class="h-12 flex-row items-center gap-3 border-b border-gray-200 px-4">
      <If when={nav.routes().length > 1}>
        <Text role="button" onPress={() => nav.pop()} class="text-blue-600 active:opacity-60">
          Back
        </Text>
      </If>
      <Text style={{ fontSize: 17, fontWeight: "600" }}>{props.title}</Text>
    </View>
  );
}

function Inbox() {
  return (
    <NavPage title="Inbox" header={<Header title="Inbox" />}>
      <Scroll style={{ flex: 1 }}>
        <Each of={[1, 2, 3, 4, 5]}>
          {(id) => (
            <View onPress={() => nav.push({ name: "message", id: id() })} class="p-4 active:bg-gray-100">
              <Text>Message {id()}</Text>
            </View>
          )}
        </Each>
      </Scroll>
    </NavPage>
  );
}

function Message(props: { id: number }) {
  return (
    <NavPage title={`Message ${props.id}`} header={<Header title={`Message ${props.id}`} />}>
      <View style={{ flex: 1, padding: 16 }}>
        <Text>The body of message {props.id}.</Text>
      </View>
    </NavPage>
  );
}

function App() {
  return (
    <NavStack state={nav} style={{ flex: 1 }}>
      {(route) => {
        switch (route.name) {
          case "inbox":
            return <Inbox />;
          case "message":
            return <Message id={route.id} />;
        }
      }}
    </NavStack>
  );
}

mount(App);

use std::rc::Rc;

use nsh_core::prelude::*;

/// A pushed page: its key (unique in the stack) and what makes it.
#[derive(Clone)]
pub struct Route {
    pub key: SharedString,
    pub page: Rc<dyn Fn() -> Screen>,
}

impl PartialEq for Route {
    fn eq(&self, other: &Self) -> bool {
        self.key == other.key
    }
}

/// The pushed pages, bottom to top: one signal for the whole app.
#[derive(Default, Clone)]
pub struct Routes(pub Vec<Route>);

pub fn routes() -> Signal<Routes> {
    global::<Routes>()
}

// Elsewhere: routes().update(|r| r.0.push(Route { key: "settings".into(), page: Rc::new(settings) }));

import { type JSX } from "nsh";
import { createNavStack } from "nsh/base";

export type Route = { name: "home" } | { name: "page"; page: () => JSX.Element };
export const nav = createNavStack<Route>([{ name: "home" }]);

// Elsewhere: nav.push({ name: "page", page: Settings });

fn compose(routes: Signal<Vec<Route>>) -> Screen {
    let draft = signal(String::new());
    let cancel = move || {
        text("Cancel")
            .on_press(move || routes.update(|r| { r.pop(); }))
            .text_size(px(17.0))
            .text_color(rgb(0x0969da))
    };
    let send_button = move || {
        text("Send")
            .on_press(move || send(draft.get()))
            .text_size(px(17.0))
            .font_weight(FontWeight::SEMIBOLD)
            .text_color(move || if draft.with(String::is_empty) { rgb(0x8c959f) } else { rgb(0x0969da) })
    };
    nav_page()
        .title("New message")
        .header_left(cancel())
        .header_right(send_button())
        .header(
            view()
                .h(px(48.0))
                .flex_row()
                .items_center()
                .justify_between()
                .px_4()
                .child(cancel())
                .child(text("New message").text_size(px(17.0)).font_weight(FontWeight::SEMIBOLD))
                .child(send_button()),
        )
        .child(
            input()
                .multiline(true)
                .value(move || draft.get())
                .on_change(move |t: &str| draft.set(t.to_owned()))
                .flex_1()
                .p(px(16.0))
                .text_size(px(17.0)),
        )
}

function Compose() {
  const text = signal("");
  const cancel = () => (
    <Text onPress={() => nav.pop()} style={{ fontSize: 17, color: "#0969da" }}>
      Cancel
    </Text>
  );
  const sendButton = () => (
    <Text
      onPress={() => send(text())}
      style={{ fontSize: 17, fontWeight: "600", color: text() ? "#0969da" : "#8c959f" }}
    >
      Send
    </Text>
  );
  return (
    <NavPage
      title="New message"
      headerLeft={cancel()}
      headerRight={sendButton()}
      header={
        <View class="h-12 flex-row items-center justify-between px-4">
          {cancel()}
          <Text style={{ fontSize: 17, fontWeight: "600" }}>New message</Text>
          {sendButton()}
        </View>
      }
    >
      <Input multiline value={text()} onChange={({ value }) => text.set(value)} style={{ flex: 1, padding: 16, fontSize: 17 }} />
    </NavPage>
  );
}

nav_page()
    .title("Profile")
    .header_style_with(|s| s.bg(rgb(0x1a7f37)).text_color(rgb(0xffffff)).tint_color(rgb(0xffffff)))

<NavPage title="Profile" headerStyle={{ backgroundColor: "#1a7f37", color: "#ffffff", tintColor: "#ffffff" }}>
  …
</NavPage>

use nsh_base::nav_page;

nav_page()
    .header_visible(false)
    .child(view().flex_1().p_safe_area() /* … */)

<NavPage headerVisible={false}>
  <View class="flex-1 pt-[calc(env(safe-area-inset-top)+16px)] pb-[calc(env(safe-area-inset-bottom)+16px)] px-4">…</View>
</NavPage>

use nsh_base::{alert_dialog, nav_page};
use nsh_core::prelude::*;

fn edit_note(routes: Signal<Vec<Route>>) -> Screen {
    let draft = signal(String::new());
    let confirm = move || {
        spawn(async move {
            let choice = alert_dialog()
                .title("Discard your changes?")
                .cancel("keep", "Keep editing")
                .destructive("discard", "Discard")
                .show()
                .await;
            if choice.is_ok_and(|r| r.action.as_deref() == Some("discard")) {
                routes.update(|r| { r.pop(); });
            }
        });
    };
    nav_page()
        .title("Edit")
        .pop_on_back(move || draft.with(String::is_empty))
        .on_back_press(move || {
            if !draft.with(String::is_empty) {
                confirm();
            }
        })
        .child(
            input()
                .value(move || draft.get())
                .on_change(move |t: &str| draft.set(t.to_owned()))
                .placeholder("A note")
                .m(px(16.0))
                .text_size(px(17.0)),
        )
}

import { signal } from "nsh";
import { AlertDialog, NavPage, Input } from "nsh/base";

function EditNote() {
  const text = signal("");
  const dirty = () => text().length > 0;
  const confirm = async () => {
    const { action } = await AlertDialog.show({
      title: "Discard your changes?",
      actions: [
        { label: "Keep editing", role: "cancel", id: "keep" },
        { label: "Discard", role: "destructive", id: "discard" },
      ],
    });
    if (action === "discard") nav.pop();
  };
  return (
    <NavPage title="Edit" popOnBack={!dirty()} onBackPress={() => dirty() && confirm()}>
      <Input value={text()} onChange={({ value }) => text.set(value)} placeholder="A note" style={{ margin: 16, fontSize: 17 }} />
    </NavPage>
  );
}

use nsh_base::dialog;
use nsh_core::prelude::*;

pub fn files() -> impl IntoElement {
    let open = signal(false);
    view()
        .flex_1()
        .child(view().on_press(move || open.set(true)).p(px(16.0)).child(text("Delete the file")))
        .child(when(
            move || open.get(),
            move || {
                dialog()
                    .animation(ModalAnimation::Fade)
                    // Escape, Android's back button, a swipe down on a sheet.
                    .on_cancel(move || open.set(false))
                    .child(
                        // The backdrop and the popup are the app's views.
                        view()
                            .flex_1()
                            .bg(rgba(0x00000066))
                            .items_center()
                            .justify_center()
                            .on_press(move || open.set(false))
                            .child(
                                view()
                                    .w(px(320.0))
                                    .gap_3()
                                    .rounded_2xl()
                                    .bg(white())
                                    .p_5()
                                    .on_press(|| {})
                                    .child(text("Delete the file?").text_size(px(20.0)).font_weight(FontWeight::BOLD))
                                    .child(
                                        view()
                                            .on_press(move || open.set(false))
                                            .child(text("Delete").text_color(rgb(0xcf222e))),
                                    ),
                            ),
                    )
            },
        ))
}

import { signal, Text, View } from "nsh";
import { Dialog } from "nsh/base";

function Files() {
  const open = signal(false);
  return (
    <View style={{ flex: 1 }}>
      <View onPress={() => open.set(true)} style={{ padding: 16 }}>
        <Text>Delete the file</Text>
      </View>
      <Dialog
        open={open()}
        animation="fade"
        onOpenChange={(e) => open.set(e.open)}
        backdropClass="bg-black/40"
        class="m-auto w-80 gap-3 rounded-2xl bg-white p-5"
      >
        <Text style={{ fontSize: 20, fontWeight: "700" }}>Delete the file?</Text>
        <View onPress={() => open.set(false)}>
          <Text style={{ color: "#cf222e" }}>Delete</Text>
        </View>
      </Dialog>
    </View>
  );
}

use nsh_core::prelude::*;

pub fn editor() -> impl IntoElement {
    let selecting = signal(false);
    // Listening only while selecting: otherwise the stack pops, with the gesture's preview.
    effect(move || {
        if selecting.get() {
            on_back_press(move || {
                selecting.set(false);
                true
            });
        }
    });
    // …
    view()
}

import { effect, signal } from "nsh";
import { BackHandler } from "nsh/mobile";

function Editor() {
  const selecting = signal(false);
  // Listening only while selecting: otherwise the stack pops, with the gesture's preview.
  effect(() => {
    if (selecting()) {
      BackHandler.on("press", () => {
        selecting.set(false);
        return true;
      });
    }
  });
  // …
}