Forms and the keyboard

use nsh_core::prelude::*;

fn field(label: &'static str, value: Signal<String>, masked: bool) -> impl IntoElement {
    let focused = signal(false);
    view()
        .gap_1()
        .child(text(label).text_sm().text_color(rgb(0x737373)))
        .child(
            input()
                .value(move || value.get())
                .on_change(move |text: &str| value.set(text.to_owned()))
                .masked(masked)
                .on_focus(move || focused.set(true))
                .on_blur(move || focused.set(false))
                .rounded_lg()
                .border_1()
                .px_3()
                .py_2()
                .text_base()
                .border_color(move || if focused.get() { rgb(0x0969da) } else { rgb(0xd0d7de) }),
        )
}

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

function Field(props: { label: string; value: string; onChange: (e: { value: string }) => void; masked?: boolean }) {
  const focused = signal(false);
  return (
    <View class="gap-1">
      <Text class="text-sm text-neutral-500">{props.label}</Text>
      <Input
        value={props.value}
        onChange={props.onChange}
        masked={props.masked}
        onFocus={() => focused.set(true)}
        onBlur={() => focused.set(false)}
        class="rounded-lg border px-3 py-2 text-base"
        style={{ borderColor: focused() ? "#0969da" : "#d0d7de" }}
      />
    </View>
  );
}

use nsh_core::prelude::*;

#[component]
pub fn App() -> impl IntoElement {
    let name = signal(String::new());
    view()
        .flex_1()
        .p(px(16.0))
        .pt(px(60.0))
        .gap(px(8.0))
        .child(
            input()
                .value(move || name.get())
                .on_change(move |text: &str| name.set(text.to_owned()))
                .placeholder("Your name")
                .text_size(px(17.0))
                .border_1()
                .border_color(rgb(0xd0d7de))
                .rounded(px(10.0))
                .p(px(12.0)),
        )
        .child(text(move || {
            let name = name.get();
            format!("Hello, {}", if name.is_empty() { "stranger" } else { &name })
        }))
}

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

function App() {
  const name = signal("");
  return (
    <View style={{ flex: 1, padding: 16, paddingTop: 60, gap: 8 }}>
      <Input
        value={name()}
        onChange={({ value }) => name.set(value)}
        placeholder="Your name"
        style={{ fontSize: 17, borderWidth: 1, borderColor: "#d0d7de", borderRadius: 10, padding: 12 }}
      />
      <Text>Hello, {name() || "stranger"}</Text>
    </View>
  );
}

mount(App);

let query = signal(String::new());
let composing = signal(false);
input()
    .value(move || query.get())
    .on_change(move |text: &str| {
        query.set(text.to_owned());
        if !composing.get() {
            search(text);
        }
    })
    .on_composition_change(move |e: &Composition| {
        composing.set(e.composing);
        if !e.composing {
            search(&query.get());
        }
    })

const query = signal("");
let composing = false;
<Input
  value={query()}
  onChange={({ value }) => {
    query.set(value);
    if (!composing) search(value);
  }}
  onCompositionChange={(e) => {
    composing = e.composing;
    if (!e.composing) search(query());
  }}
/>

input()
    .placeholder("Search")
    .rounded_lg()
    .border_1()
    .border_color(rgb(0xd4d4d8))
    .px_3()
    .py_2()
    .text_base()
    .focus(|s| s.border_color(rgb(0x3b82f6)))
    .placeholder_color(rgb(0xa1a1aa))
    .selection_color(rgb(0x2563eb))

<Input
  class="rounded-lg border border-zinc-300 px-3 py-2 text-base focus:border-blue-500 placeholder:text-zinc-400 selection:text-blue-600"
  placeholder="Search"
/>

use nsh_core::element::AutoFill;

input()
    .keyboard_type(KeyboardType::Email)
    .auto_capitalize(AutoCapitalize::None)
    .auto_correct(false)
    .auto_fill(AutoFill::Email)
    .placeholder("E-mail")
input().masked(true).auto_fill(AutoFill::NewPassword).placeholder("Password")
input()
    .keyboard_type(KeyboardType::Number)
    .auto_fill(AutoFill::OneTimeCode)
    .max_length(6)
    .placeholder("Code")

<Input keyboardType="email-address" autoCapitalize="none" autoCorrect={false} autoComplete="email" placeholder="E-mail" />
<Input masked autoComplete="new-password" placeholder="Password" />
<Input keyboardType="number-pad" autoComplete="one-time-code" maxLength={6} placeholder="Code" />

use nsh_core::prelude::*;

pub fn sign_in() -> impl IntoElement {
    let email = signal(String::new());
    let password = element_ref();
    let submit = move || log::info!("sign in {}", email.get());
    view()
        .flex_1()
        .p(px(16.0))
        .pt(px(60.0))
        .gap(px(12.0))
        .child(
            input()
                .value(move || email.get())
                .on_change(move |t: &str| email.set(t.to_owned()))
                .keyboard_type(KeyboardType::Email)
                .auto_capitalize(AutoCapitalize::None)
                .return_key_type(ReturnKeyType::Next)
                .submit_behavior(SubmitBehavior::Submit)
                .on_submit(move |_: &str| password.focus())
                .placeholder("E-mail"),
        )
        .child(
            input()
                .element_ref(&password)
                .masked(true)
                .return_key_type(ReturnKeyType::Go)
                .on_submit(move |_: &str| submit())
                .placeholder("Password"),
        )
}

import { type InputRef, mount, signal, View } from "nsh";
import { Input } from "nsh/base";

function SignIn() {
  const email = signal("");
  let password!: InputRef;
  const submit = () => console.log("sign in", email());
  return (
    <View style={{ flex: 1, padding: 16, paddingTop: 60, gap: 12 }}>
      <Input
        value={email()}
        onChange={({ value }) => email.set(value)}
        keyboardType="email-address"
        autoCapitalize="none"
        returnKeyType="next"
        submitBehavior="submit"
        onSubmit={() => password.focus()}
        placeholder="E-mail"
      />
      <Input ref={password} masked returnKeyType="go" onSubmit={submit} placeholder="Password" />
    </View>
  );
}

mount(SignIn);

view().on_press(|| dismiss_keyboard())

import { View, Keyboard } from "nsh";

<View onPress={() => Keyboard.dismiss()}>…</View>

/// `start..end` of `text` in UTF-16 units, as inputs count.
fn utf16_slice(text: &str, start: u32, end: u32) -> String {
    let units: Vec<u16> = text.encode_utf16().collect();
    let end = (end as usize).min(units.len());
    String::from_utf16_lossy(&units[(start as usize).min(end)..end])
}

let content = signal("Select part of this text".to_owned());
let range = signal(Selection::default());
let field = element_ref();

view()
    .child(
        input()
            .element_ref(&field)
            .value(move || content.get())
            .on_change(move |t: &str| content.set(t.to_owned()))
            .on_selection_change(move |r: &Selection| range.set(*r)),
    )
    .child(text(move || {
        let r = range.get();
        format!("Selected: \"{}\"", content.with(|t| utf16_slice(t, r.start, r.end)))
    }))
    .child(
        view()
            .on_press(move || {
                let len = content.with(|t| t.encode_utf16().count()) as u32;
                field.set_selection(0, len);
            })
            .child(text("Select all")),
    )

const text = signal("Select part of this text");
const range = signal({ start: 0, end: 0 });
const selection = signal<{ start: number; end?: number } | undefined>(undefined);

<Input
  value={text()}
  onChange={({ value }) => text.set(value)}
  selectedRange={selection()}
  onSelectionChange={(r) => range.set(r)}
/>
<Text>Selected: "{text().slice(range().start, range().end)}"</Text>
<View onPress={() => selection.set({ start: 0, end: text().length })}><Text>Select all</Text></View>

let draft = signal(String::new());
let end = signal(0u32);
let caret = signal(None::<Bounds<Points>>);

view()
    .child(
        input()
            .multiline(true)
            .value(move || draft.get())
            .on_change(move |t: &str| draft.set(t.to_owned()))
            .on_selection_change(move |s: &Selection| end.set(s.end))
            .on_caret_move(move |e: &CaretEvent| {
                // Suggestions while the word before the caret starts with "@".
                let typed = draft.with(|t| utf16_slice(t, 0, end.get()));
                let word = typed.rsplit(char::is_whitespace).next().unwrap_or("");
                caret.set(word.starts_with('@').then_some(e.page_bounds));
            })
            .p_2(),
    )
    .child(when(
        move || caret.get().is_some(),
        move || {
            overlay()
                .anchor_bounds(move || caret.get().unwrap_or_default())
                .placement(Placement::Bottom)
                .align(Align::Start)
                .offset(px(4.0))
                .child(text("@ada"))
                .child(text("@grace"))
        },
    ))

import { type Bounds, Overlay, Text, View, signal } from "nsh";
import { Input } from "nsh/base";

const draft = signal("");
const end = signal(0);
const caret = signal<Bounds | null>(null);

<View>
  <Input
    multiline
    value={draft()}
    onChange={({ value }) => draft.set(value)}
    onSelectionChange={(e) => end.set(e.end)}
    onCaretMove={(e) => {
      // Suggestions while the word before the caret starts with "@".
      const word = draft().slice(0, end()).split(/\s/).pop() ?? "";
      caret.set(word.startsWith("@") ? e.pageBounds : null);
    }}
    class="p-2"
  />
  <If when={caret()}>
    <Overlay anchor={caret()} placement="bottom" align="start" offset={4}>
      <Text>@ada</Text>
      <Text>@grace</Text>
    </Overlay>
  </If>
</View>;

let attachments = signal(Vec::<PastedFile>::new());

input()
    .multiline(true)
    .placeholder("Message")
    .on_paste(move |e: &PasteEvent| {
        // A screenshot pasted into the message goes along as an image.
        attachments.update(|a| a.extend(e.files.iter().cloned()));
    })
    .p_2()

import { signal } from "nsh";
import { Input } from "nsh/base";

const attachments = signal<File[]>([]);

<Input
  multiline
  placeholder="Message"
  onPaste={(e) => {
    // A screenshot pasted into the message goes along as an image.
    attachments.update((a) => [...a, ...e.files]);
  }}
  class="p-2"
/>;

let height = signal(px(0.0));

input()
    .multiline(true)
    .placeholder("Write a comment")
    .on_content_size_change(move |e: &Size<Points>| height.set(e.height.min(px(120.0))))
    .text_size(px(16.0))
    .p(px(10.0))
    .border_1()
    .border_color(rgb(0xd0d7de))
    .rounded(px(10.0))
    .h(move || height.get().max(px(20.0)) + px(20.0))

const height = signal(0);

<Input
  multiline
  placeholder="Write a comment"
  onContentSizeChange={({ size }) => height.set(Math.min(size.height, 120))}
  style={{ fontSize: 16, padding: 10, borderWidth: 1, borderColor: "#d0d7de", borderRadius: 10, height: Math.max(height(), 20) + 20 }}
/>

scroll()
    .flex_1()
    .keyboard_dismiss_mode(KeyboardDismissMode::OnDrag)
    .keyboard_taps(KeyboardTaps::Handled)
    .child(view().p(px(16.0)).gap(px(12.0)) /* inputs */)

<Scroll style={{ flex: 1 }} keyboardDismissMode="on-drag" keyboardShouldPersistTaps="handled">
  <View style={{ padding: 16, gap: 12 }}>
    {/* inputs */}
  </View>
</Scroll>

use nsh_core::prelude::*;

pub fn chat_screen() -> impl IntoElement {
    let draft = signal(String::new());
    let send = move || {
        let text = draft.get();
        if !text.trim().is_empty() {
            log::info!("send {text}");
        }
        draft.set(String::new());
    };
    view()
        .flex_1()
        .pb_keyboard()
        .child(scroll().flex_1().keyboard_dismiss_mode(KeyboardDismissMode::Interactive) /* messages */)
        .child(
            view()
                .flex_row()
                .p(px(8.0))
                // Above the home indicator, unless the keyboard covers it.
                .pb(move || {
                    px(8.0) + if keyboard_height() > px(0.0) { px(0.0) } else { safe_area().bottom }
                })
                .child(
                    input()
                        .value(move || draft.get())
                        .on_change(move |t: &str| draft.set(t.to_owned()))
                        .multiline(true)
                        .submit_behavior(SubmitBehavior::Submit)
                        .return_key_type(ReturnKeyType::Send)
                        .on_submit(move |_: &str| send())
                        .placeholder("Message")
                        .flex_1()
                        .max_h(px(120.0)),
                ),
        )
}

import { Scroll, signal, View, keyboardFrame, safeAreaInsets } from "nsh";
import { Input } from "nsh/base";

function ChatScreen() {
  const insets = safeAreaInsets();
  const draft = signal("");
  const send = () => {
    if (draft().trim()) console.log("send", draft());
    draft.set("");
  };
  return (
    <View style={{ flex: 1, paddingBottom: "env(keyboard-inset-height)" }}>
      <Scroll style={{ flex: 1 }} keyboardDismissMode="interactive">
        {/* messages */}
      </Scroll>
      <View
        style={{
          flexDirection: "row",
          padding: 8,
          // Above the home indicator, unless the keyboard covers it.
          paddingBottom: 8 + (keyboardFrame().height > 0 ? 0 : insets().bottom),
        }}
      >
        <Input
          value={draft()}
          onChange={({ value }) => draft.set(value)}
          multiline
          submitBehavior="submit"
          returnKeyType="send"
          onSubmit={send}
          placeholder="Message"
          style={{ flex: 1, maxHeight: 120 }}
        />
      </View>
    </View>
  );
}

view().child(when(
    || keyboard_height() == px(0.0),
    || view().absolute().right(px(16.0)).bottom(px(16.0)), /* … */
))

import { View, keyboardFrame } from "nsh";

<If when={keyboardFrame().height === 0}>
  <View style={{ position: "absolute", right: 16, bottom: 16 }}>…</View>
</If>

use nsh_core::prelude::*;

pub fn note() -> impl IntoElement {
    let content = signal(String::new());
    let field = element_ref();
    view()
        .p(px(16.0))
        .child(
            input()
                .element_ref(&field)
                .value(move || content.get())
                .on_change(move |t: &str| content.set(t.to_owned()))
                .input_accessory("note-bar")
                .placeholder("A note"),
        )
        .child(
            input_accessory_view("note-bar").bg(rgb(0xf6f8fa)).child(
                view()
                    .flex_row()
                    .items_center()
                    .p(px(8.0))
                    .child(
                        text(move || format!("{} characters", content.with(|t| t.chars().count())))
                            .flex_1()
                            .text_color(rgb(0x57606a)),
                    )
                    .child(
                        text("Done")
                            .on_press(move || field.blur())
                            .text_color(rgb(0x0969da))
                            .font_weight(FontWeight::SEMIBOLD),
                    ),
            ),
        )
}

import { type InputRef, signal, Text, View } from "nsh";
import { Input } from "nsh/base";
import { InputAccessoryView } from "nsh/mobile";

function Note() {
  const text = signal("");
  let input!: InputRef;
  return (
    <View style={{ padding: 16 }}>
      <Input
        ref={input}
        value={text()}
        onChange={({ value }) => text.set(value)}
        ios={{ inputAccessoryViewID: "note-bar" }}
        placeholder="A note"
      />
      <InputAccessoryView nativeID="note-bar" style={{ backgroundColor: "#f6f8fa" }}>
        <View style={{ flexDirection: "row", alignItems: "center", padding: 8 }}>
          <Text style={{ flex: 1, color: "#57606a" }}>{text().length} characters</Text>
          <Text onPress={() => input.blur()} style={{ color: "#0969da", fontWeight: "600" }}>Done</Text>
        </View>
      </InputAccessoryView>
    </View>
  );
}