mobiler_web/
lib.rs

1//! `mobiler-web` — Mobiler's web shell.
2//!
3//! Renders **any** Mobiler app's `Widget` tree to the DOM (Leptos / WASM), driving
4//! the Rust core via crux's `Core` and fulfilling capabilities (HTTP) with the
5//! browser's `fetch`. The web twin of the generic Android/SwiftUI shells: write
6//! your app once as a `MobilerApp`, then
7//!
8//! ```ignore
9//! fn main() { mobiler_web::run::<my_app::App>(); }
10//! ```
11//!
12//! renders it on the web — fully styled, no CSS required: the shell ships its own
13//! theme (`mobiler.css`) and injects it on mount, and `Scaffold.dark_mode` flips
14//! the whole theme. Your crate only supplies a minimal `index.html` with the Trunk
15//! entry point; an app may add its own stylesheet to override any widget class.
16
17use std::cell::RefCell;
18use std::sync::Arc;
19
20use crux_core::{App, Core};
21use leptos::prelude::*;
22use mobiler_core::{
23    Action, BoxAlign, ButtonStyle, CardStyle, ChartBracket, ChartLegendItem, ChartRefLine, ChartRegion,
24    ChartSeries, ChartStyle, ChartTick, Corner, Density, Effect, FieldKind, FontFamily, Icon,
25    ImageRatio, ImageShape, InputValue, PluginCall, PluginNotify, PluginResponse, ProjectColor,
26    Rgb, Spacing, TextStyle, Theme, Tone, Widget,
27};
28use wasm_bindgen_futures::spawn_local;
29
30/// The shell's own stylesheet — the web twin of the look the Android/SwiftUI shells
31/// decide in code. Shipped with the crate and injected on mount, so `run::<App>()`
32/// renders a fully styled, themeable app with no CSS required from the consuming
33/// app (it can still override any class). Uses CSS variables so `Scaffold.dark_mode`
34/// flips the whole theme by toggling one class.
35const STYLE: &str = include_str!("mobiler.css");
36
37/// Cloneable handle for sending an `Action` into the core. Leptos 0.7 view closures
38/// require `Send`, so this is `Arc` + `Send + Sync` (the crux `Core` is both).
39type Dispatch = Arc<dyn Fn(Action) + Send + Sync>;
40
41/// What a Mobiler app must be to render on the web: a crux `App` speaking the fixed
42/// ABI (`Action` in, `Widget` out, `Effect` for capabilities). `MobilerShell<_>`
43/// satisfies this automatically.
44pub trait WebApp:
45    App<Event = Action, ViewModel = Widget, Effect = Effect> + Default + Send + Sync + 'static
46where
47    Self::Model: Default + Send + Sync,
48{
49}
50impl<T> WebApp for T
51where
52    T: App<Event = Action, ViewModel = Widget, Effect = Effect> + Default + Send + Sync + 'static,
53    T::Model: Default + Send + Sync,
54{
55}
56
57/// Mount a Mobiler app into the document body. Call from your wasm `main`.
58pub fn run<A: WebApp>()
59where
60    A::Model: Default + Send + Sync,
61{
62    console_error_panic_hook::set_once();
63    inject_default_style();
64    leptos::mount::mount_to_body(shell::<A>);
65}
66
67/// Inject the shell's default stylesheet at the **front** of `<head>` so it's the
68/// lowest-precedence baseline: an app that ships its own CSS (later in the document)
69/// overrides any of these classes, while an app with no CSS still gets a full theme.
70fn inject_default_style() {
71    let document = leptos::prelude::document();
72    let Some(head) = document.head() else { return };
73    let Ok(style) = document.create_element("style") else { return };
74    let _ = style.set_attribute("data-mobiler", "shell");
75    style.set_text_content(Some(STYLE));
76    let _ = head.insert_before(&style, head.first_child().as_ref());
77}
78
79fn shell<A: WebApp>() -> impl IntoView
80where
81    A::Model: Default + Send + Sync,
82{
83    let core = Arc::new(Core::<A>::new());
84    let (view, set_view) = signal(core.view());
85
86    let send: Dispatch = {
87        let core = core.clone();
88        Arc::new(move |action: Action| {
89            let effects = core.process_event(action);
90            drive(&core, set_view, effects);
91        })
92    };
93
94    // Restore persisted state (localStorage), then fire Start — mirrors the native
95    // shells (which restore before Start so the app sees its saved Model on launch).
96    let saved = local_storage().and_then(|s| s.get_item(STORAGE_KEY).ok().flatten()).unwrap_or_default();
97    if !saved.is_empty() {
98        send(Action::Restore { data: saved });
99    }
100    send(Action::Start);
101
102    let send_for_view = send.clone();
103    view! {
104        <div class="app">
105            {move || render(&view.get(), &send_for_view)}
106        </div>
107    }
108}
109
110/// Process effects: re-read the view on Render; fulfil HTTP via fetch and resolve.
111fn drive<A: WebApp>(core: &Arc<Core<A>>, set_view: WriteSignal<Widget>, effects: Vec<Effect>)
112where
113    A::Model: Default + Send + Sync,
114{
115    for effect in effects {
116        match effect {
117            Effect::Render(_) => set_view.set(core.view()),
118            Effect::PluginNotify(notify) => perform_notify(&notify.operation),
119            Effect::Plugin(mut request) => {
120                let core = core.clone();
121                spawn_local(async move {
122                    let response = perform(&request.operation).await;
123                    if let Ok(next) = core.resolve(&mut request, response) {
124                        drive(&core, set_view, next);
125                    }
126                });
127            }
128        }
129    }
130}
131
132/// Fulfil a request/response capability. `http` via `fetch`; `device` via the
133/// browser's user-agent string (the web analogue of a device model).
134async fn perform(call: &PluginCall) -> PluginResponse {
135    if call.plugin == "device" {
136        let nav = web_sys::window().map(|w| w.navigator());
137        let output = if call.op == "locale" {
138            // The browser's preferred language as a BCP-47 tag (e.g. "de-CH").
139            nav.and_then(|n| n.language()).unwrap_or_else(|| "en-US".into())
140        } else {
141            nav.and_then(|n| n.user_agent().ok()).unwrap_or_default()
142        };
143        return PluginResponse { ok: true, output };
144    }
145    if call.plugin == "photo" && call.op == "pick" {
146        return take_image(false).await;
147    }
148    if call.plugin == "camera" && call.op == "capture" {
149        return take_image(true).await;
150    }
151    if call.plugin == "datetime" {
152        return match call.op.as_str() {
153            "date" => take_datetime("date").await,
154            "time" => take_datetime("time").await,
155            other => PluginResponse { ok: false, output: format!("unknown datetime op '{other}'") },
156        };
157    }
158    if call.plugin == "dialog" && call.op == "confirm" {
159        let v: serde_json::Value = serde_json::from_str(&call.input).unwrap_or(serde_json::Value::Null);
160        let title = v.get("title").and_then(serde_json::Value::as_str).unwrap_or("");
161        let message = v.get("message").and_then(serde_json::Value::as_str).unwrap_or("");
162        let prompt = if title.is_empty() { message.to_string() } else { format!("{title}\n\n{message}") };
163        let ok = web_sys::window()
164            .and_then(|w| w.confirm_with_message(&prompt).ok())
165            .unwrap_or(false);
166        return PluginResponse { ok, output: if ok { "ok".into() } else { "cancel".into() } };
167    }
168    if call.plugin != "http" {
169        return PluginResponse { ok: false, output: format!("plugin '{}' not available", call.plugin) };
170    }
171    let v: serde_json::Value = serde_json::from_str(&call.input).unwrap_or(serde_json::Value::Null);
172    let url = v.get("url").and_then(serde_json::Value::as_str).unwrap_or("");
173    let body = v.get("body").and_then(serde_json::Value::as_str);
174
175    use gloo_net::http::Request;
176    let builder = match call.op.as_str() {
177        "POST" => Request::post(url),
178        "PATCH" => Request::patch(url),
179        "DELETE" => Request::delete(url),
180        _ => Request::get(url),
181    };
182    let request = match body {
183        Some(b) => builder.header("Content-Type", "application/json").body(b),
184        None => builder.build(),
185    };
186    let request = match request {
187        Ok(r) => r,
188        Err(e) => return PluginResponse { ok: false, output: e.to_string() },
189    };
190    match request.send().await {
191        Ok(resp) => PluginResponse { ok: resp.ok(), output: resp.text().await.unwrap_or_default() },
192        Err(e) => PluginResponse { ok: false, output: e.to_string() },
193    }
194}
195
196/// Pick or capture an image via a hidden `<input type=file accept=image/*>`, clicked
197/// to open the browser's file dialog — or, with `capture`, to hint the device camera on
198/// supporting mobile browsers (desktop falls back to the file dialog). Awaits the
199/// `change` event and returns a `blob:` object URL the `<img>` renderer loads. No
200/// permission needed (the picker/camera prompt is the browser's). Backs both the
201/// `photo`/`pick` and `camera`/`capture` capabilities.
202async fn take_image(capture: bool) -> PluginResponse {
203    use wasm_bindgen::{closure::Closure, JsCast};
204    let Some(doc) = web_sys::window().and_then(|w| w.document()) else {
205        return PluginResponse { ok: false, output: "no document".into() };
206    };
207    let Some(input) = doc.create_element("input").ok().and_then(|e| e.dyn_into::<web_sys::HtmlInputElement>().ok()) else {
208        return PluginResponse { ok: false, output: "no input element".into() };
209    };
210    input.set_type("file");
211    input.set_accept("image/*");
212    if capture {
213        // Hints the environment-facing camera on mobile browsers that support it.
214        let _ = input.set_attribute("capture", "environment");
215    }
216
217    let (tx, rx) = futures_channel::oneshot::channel::<Option<String>>();
218    let tx = std::cell::RefCell::new(Some(tx));
219    let input_for_cb = input.clone();
220    let on_change = Closure::wrap(Box::new(move || {
221        let url = input_for_cb
222            .files()
223            .and_then(|files| files.get(0))
224            .and_then(|file| web_sys::Url::create_object_url_with_blob(&file).ok());
225        if let Some(tx) = tx.borrow_mut().take() {
226            let _ = tx.send(url);
227        }
228    }) as Box<dyn FnMut()>);
229    input.set_onchange(Some(on_change.as_ref().unchecked_ref()));
230    input.click();
231    on_change.forget(); // keep the handler alive until `change` fires
232
233    match rx.await {
234        Ok(Some(url)) => PluginResponse { ok: true, output: url },
235        _ => PluginResponse { ok: false, output: "cancelled".into() },
236    }
237}
238
239/// Pick a date (`kind = "date"`) or time (`kind = "time"`) via a hidden native
240/// `<input>`, opening the browser's picker with `showPicker()`. Returns the value
241/// (`YYYY-MM-DD` for date, 24-hour `HH:MM` for time); `ok=false` on cancel/dismiss.
242/// Backs the `datetime` capability (`cx.pick_date` / `cx.pick_time`).
243async fn take_datetime(kind: &str) -> PluginResponse {
244    use wasm_bindgen::{closure::Closure, JsCast};
245    let Some(doc) = web_sys::window().and_then(|w| w.document()) else {
246        return PluginResponse { ok: false, output: "no document".into() };
247    };
248    let Some(input) = doc.create_element("input").ok().and_then(|e| e.dyn_into::<web_sys::HtmlInputElement>().ok()) else {
249        return PluginResponse { ok: false, output: "no input element".into() };
250    };
251    input.set_type(kind); // "date" or "time"
252    // showPicker() needs a connected element; keep it in the DOM but out of sight.
253    let _ = input.set_attribute("style", "position:fixed;left:-9999px;opacity:0");
254    if let Some(body) = doc.body() {
255        let _ = body.append_child(&input);
256    }
257
258    let (tx, rx) = futures_channel::oneshot::channel::<Option<String>>();
259    let tx = std::rc::Rc::new(std::cell::RefCell::new(Some(tx)));
260    let input_for_change = input.clone();
261    let tx_change = tx.clone();
262    let on_change = Closure::wrap(Box::new(move || {
263        let v = input_for_change.value();
264        if let Some(tx) = tx_change.borrow_mut().take() {
265            let _ = tx.send(if v.is_empty() { None } else { Some(v) });
266        }
267    }) as Box<dyn FnMut()>);
268    let tx_cancel = tx.clone();
269    let on_cancel = Closure::wrap(Box::new(move || {
270        if let Some(tx) = tx_cancel.borrow_mut().take() {
271            let _ = tx.send(None);
272        }
273    }) as Box<dyn FnMut()>);
274    let _ = input.add_event_listener_with_callback("change", on_change.as_ref().unchecked_ref());
275    let _ = input.add_event_listener_with_callback("cancel", on_cancel.as_ref().unchecked_ref());
276    if input.show_picker().is_err() {
277        input.click(); // older browsers: focus the field so the user can type a value
278    }
279    on_change.forget(); // keep the handlers alive until an event fires
280    on_cancel.forget();
281
282    let result = rx.await;
283    input.remove();
284    match result {
285        Ok(Some(v)) => PluginResponse { ok: true, output: v },
286        _ => PluginResponse { ok: false, output: "cancelled".into() },
287    }
288}
289
290const STORAGE_KEY: &str = "mobiler.state";
291
292/// `window.localStorage`, if available.
293fn local_storage() -> Option<web_sys::Storage> {
294    web_sys::window()?.local_storage().ok().flatten()
295}
296
297/// Fulfil a fire-and-forget capability in the browser — the web twin of the native
298/// shells' notify handlers (storage/clipboard/share/browser). None block; an unknown
299/// capability is a graceful no-op.
300fn perform_notify(notify: &PluginNotify) {
301    let win = match web_sys::window() {
302        Some(w) => w,
303        None => return,
304    };
305    match (notify.plugin.as_str(), notify.op.as_str()) {
306        // Persist the state blob (paired with cx.save + restore-on-startup above).
307        ("storage", "save") => {
308            if let Some(s) = local_storage() {
309                let _ = s.set_item(STORAGE_KEY, &notify.input);
310            }
311        }
312        // Copy to the clipboard (write_text returns a Promise we let run).
313        ("clipboard", "copy") => {
314            let _ = win.navigator().clipboard().write_text(&notify.input);
315        }
316        // Open a URL in a new tab.
317        ("browser", "open") => {
318            let _ = win.open_with_url_and_target(&notify.input, "_blank");
319        }
320        // No reliable cross-browser share sheet (navigator.share is mobile-only and
321        // gesture-gated), so degrade to copying — a sane universal fallback.
322        ("share", _) => {
323            let _ = win.navigator().clipboard().write_text(&notify.input);
324        }
325        // Transient toast: a styled div appended to <body>, auto-removed after a beat.
326        ("toast", _) => show_toast(&notify.input),
327        // Haptic tap. navigator.vibrate is unsupported on iOS Safari (a graceful no-op).
328        ("haptics", style) => {
329            let ms = match style {
330                "light" => 15,
331                "heavy" => 50,
332                _ => 30, // medium / unknown
333            };
334            let _ = win.navigator().vibrate_with_duration(ms);
335        }
336        _ => {} // unknown capability: ignore
337    }
338}
339
340/// Append a transient toast to `<body>` (styled by `.toast` in mobiler.css) and
341/// remove it after ~2.6 s — the web twin of the native toast/snackbar.
342fn show_toast(text: &str) {
343    let Some(doc) = web_sys::window().and_then(|w| w.document()) else { return };
344    let (Ok(el), Some(body)) = (doc.create_element("div"), doc.body()) else { return };
345    el.set_class_name("toast");
346    el.set_text_content(Some(text));
347    let _ = body.append_child(&el);
348    gloo_timers::callback::Timeout::new(2600, move || el.remove()).forget();
349}
350
351// ---------------- Widget → DOM ----------------
352
353/// `Widget` → DOM. **Exhaustive** by construction — the `match` has no catch-all,
354/// so (like the Compose/SwiftUI shells) it won't compile until every `Widget`
355/// variant is handled. Style *intent* (TextStyle, Tone, …) becomes a CSS class;
356/// the concrete look lives in `mobiler.css`.
357fn render(widget: &Widget, send: &Dispatch) -> AnyView {
358    match widget {
359        // ---- content ----
360        Widget::Text { content, style } => {
361            let (class, content) = (text_class(*style), content.clone());
362            view! { <p class=class>{content}</p> }.into_any()
363        }
364        Widget::Image { source, shape, ratio } => {
365            let (class, source) = (image_class(*shape, *ratio), source.clone());
366            view! { <img class=class src=source /> }.into_any()
367        }
368        Widget::Badge { label, tone } => {
369            let (class, label) = (format!("badge {}", tone_class(*tone)), label.clone());
370            view! { <span class=class>{label}</span> }.into_any()
371        }
372        Widget::ColorDot { color } => {
373            view! { <span class=format!("dot {}", dot_class(*color))></span> }.into_any()
374        }
375        Widget::Avatar { source, status } => {
376            let dot = status.map(|t| view! { <span class=format!("avatar-status {}", tone_class(t))></span> });
377            view! {
378                <span class="avatar">
379                    <img class="avatar-img" src=source.clone() />
380                    {dot}
381                </span>
382            }
383            .into_any()
384        }
385        Widget::PdfView { url } => {
386            // Browsers render PDFs natively in an iframe (remote URL or local blob/file URL).
387            view! { <iframe class="pdfview" src=url.clone() title="PDF"></iframe> }.into_any()
388        }
389        Widget::Rating { value, max, on_rate } => {
390            let value = *value;
391            let stars: Vec<AnyView> = (1..=*max)
392                .map(|i| {
393                    let threshold = u32::from(i) * 10;
394                    // filled / half / empty by tenths.
395                    let glyph = if value >= threshold { "★" } else if value + 5 >= threshold { "⯨" } else { "☆" };
396                    match on_rate {
397                        Some(tokens) => {
398                            let (send, token) = (send.clone(), tokens.get(usize::from(i - 1)).cloned().unwrap_or_default());
399                            view! {
400                                <button class="star star-tappable" on:click=move |_| send(Action::Fired { token: token.clone() })>
401                                    {glyph}
402                                </button>
403                            }
404                            .into_any()
405                        }
406                        None => view! { <span class="star">{glyph}</span> }.into_any(),
407                    }
408                })
409                .collect();
410            view! { <span class="rating">{stars}</span> }.into_any()
411        }
412        Widget::Divider => view! { <hr class="divider" /> }.into_any(),
413        Widget::Progress { value } => match value {
414            Some(v) => {
415                let pct = (v.clamp(0.0, 1.0) * 100.0) as u32;
416                view! { <div class="progress"><div class="progress-bar" style=format!("width:{pct}%")></div></div> }.into_any()
417            }
418            None => view! { <div class="progress progress-indeterminate"><div class="progress-bar"></div></div> }.into_any(),
419        },
420        Widget::Skeleton => view! { <div class="skeleton"></div> }.into_any(),
421        Widget::Chart { series, labels, style, axis, legend } => {
422            chart_view(series, labels, *style, *axis, *legend)
423        }
424        Widget::RegionChart { regions, ticks, x_max, y_max, ref_lines, bracket, legend } => {
425            region_chart_view(regions, ticks, *x_max, *y_max, ref_lines, bracket, legend)
426        }
427        Widget::Calendar { year, month, first_weekday, selected, on_day } => {
428            const MONTHS: [&str; 12] = ["January", "February", "March", "April", "May", "June",
429                "July", "August", "September", "October", "November", "December"];
430            let head_label = format!("{} {year}", MONTHS.get((*month as usize).saturating_sub(1)).copied().unwrap_or(""));
431            let weekdays = ["S", "M", "T", "W", "T", "F", "S"];
432            let heads: Vec<_> = weekdays.iter().map(|w| view! { <div class="cal-head">{*w}</div> }).collect();
433            let blanks: Vec<_> = (0..*first_weekday).map(|_| view! { <div class="cal-blank"></div> }).collect();
434            let selected = *selected;
435            let days: Vec<_> = on_day.iter().enumerate().map(|(i, token)| {
436                let day = (i + 1) as u8;
437                let token = token.clone();
438                let send = send.clone();
439                let cls = if selected == Some(day) { "cal-day cal-sel" } else { "cal-day" };
440                view! { <button class=cls on:click=move |_| send(Action::Fired { token: token.clone() })>{day.to_string()}</button> }
441            }).collect();
442            view! {
443                <div class="calendar">
444                    <div class="cal-title">{head_label}</div>
445                    <div class="cal-grid">{heads}{blanks}{days}</div>
446                </div>
447            }.into_any()
448        }
449        Widget::SwipeAction { child, actions } => {
450            // Web has no swipe gesture — render the actions inline as a trailing button row.
451            let acts: Vec<_> = actions.iter().map(|a| {
452                let token = a.on_tap.clone();
453                let send = send.clone();
454                let cls = format!("swipe-act {}", tone_class(a.tone));
455                let label = a.label.clone();
456                view! { <button class=cls on:click=move |_| send(Action::Fired { token: token.clone() })>{label}</button> }
457            }).collect();
458            view! {
459                <div class="swipe-row">
460                    <div class="swipe-content">{render(child, send)}</div>
461                    <div class="swipe-actions">{acts}</div>
462                </div>
463            }.into_any()
464        }
465        Widget::Spacer { size } => {
466            view! { <div class=format!("spacer {}", spacer_class(*size))></div> }.into_any()
467        }
468
469        // ---- layout ----
470        Widget::Row { children } => {
471            let kids = render_all(children, send);
472            view! { <div class="row">{kids}</div> }.into_any()
473        }
474        Widget::Column { children } => {
475            let kids = render_all(children, send);
476            view! { <div class="col">{kids}</div> }.into_any()
477        }
478        Widget::Card { child, style, on_press } => {
479            let class = format!("card {}", card_class(*style));
480            let body = render(child, send);
481            match on_press {
482                Some(token) => {
483                    let (send, token) = (send.clone(), token.clone());
484                    view! {
485                        <button
486                            class=format!("{class} card-tappable")
487                            on:click=move |_| send(Action::Fired { token: token.clone() })
488                        >
489                            {body}
490                        </button>
491                    }
492                    .into_any()
493                }
494                None => view! { <div class=class>{body}</div> }.into_any(),
495            }
496        }
497        // Z-stack. With `scrim`, the first child is a background image, darkened
498        // by an overlay, and the rest layer on top in light content — the DOM twin
499        // of the Compose `matchParentSize` scrim / SwiftUI `.overlay` on the image.
500        Widget::Box { children, align, scrim } => {
501            let acls = align_class(*align);
502            if *scrim && children.len() > 1 {
503                let bg = render(&children[0], send);
504                let content = render_all(&children[1..], send);
505                view! {
506                    <div class=format!("box box-scrim {acls}")>
507                        {bg}
508                        <div class="scrim"></div>
509                        <div class="box-content">{content}</div>
510                    </div>
511                }
512                .into_any()
513            } else {
514                let kids = render_all(children, send);
515                view! { <div class=format!("box {acls}")>{kids}</div> }.into_any()
516            }
517        }
518        Widget::Grid { children } => {
519            let kids = render_all(children, send);
520            view! { <div class="grid">{kids}</div> }.into_any()
521        }
522        Widget::Scroller { children } => {
523            let kids = render_all(children, send);
524            view! { <div class="scroller">{kids}</div> }.into_any()
525        }
526
527        // ---- input / actions ----
528        Widget::Button { label, style, on_press } => {
529            let (send, token, label) = (send.clone(), on_press.clone(), label.clone());
530            let class = format!("btn {}", button_class(*style));
531            view! {
532                <button class=class on:click=move |_| send(Action::Fired { token: token.clone() })>
533                    {label}
534                </button>
535            }
536            .into_any()
537        }
538        Widget::IconButton { icon, on_press } => {
539            let (send, token) = (send.clone(), on_press.clone());
540            let glyph = icon_glyph(*icon);
541            view! {
542                <button class="iconbtn" on:click=move |_| send(Action::Fired { token: token.clone() })>
543                    {glyph}
544                </button>
545            }
546            .into_any()
547        }
548        Widget::Chip { label, selected, on_press } => {
549            let (send, token, label) = (send.clone(), on_press.clone(), label.clone());
550            let class = if *selected { "chip selected" } else { "chip" };
551            view! {
552                <button class=class on:click=move |_| send(Action::Fired { token: token.clone() })>
553                    {label}
554                </button>
555            }
556            .into_any()
557        }
558        Widget::TextField { id, placeholder, value, kind, error } => {
559            let (send, id) = (send.clone(), id.clone());
560            let (placeholder, value) = (placeholder.clone(), value.clone());
561            let invalid = error.is_some();
562            let err_view = error.clone().map(|m| view! { <div class="field-error">{m}</div> });
563            // (input type, inputmode) per FieldKind. Multiline renders a <textarea> below.
564            let (itype, imode): (&str, &str) = match kind {
565                FieldKind::Secure => ("password", ""),
566                FieldKind::Email => ("email", "email"),
567                FieldKind::Number => ("text", "numeric"),
568                FieldKind::Decimal => ("text", "decimal"),
569                FieldKind::Phone => ("tel", "tel"),
570                FieldKind::Url => ("url", "url"),
571                FieldKind::Text | FieldKind::Multiline => ("text", ""),
572            };
573            let field_class = if invalid { "field field-invalid" } else { "field" };
574            let control = if matches!(kind, FieldKind::Multiline) {
575                view! {
576                    <textarea
577                        class=field_class
578                        rows="3"
579                        placeholder=placeholder
580                        prop:value=value
581                        on:input=move |ev| send(Action::Input {
582                            id: id.clone(),
583                            value: InputValue::Text(event_target_value(&ev)),
584                        })
585                    ></textarea>
586                }
587                .into_any()
588            } else {
589                view! {
590                    <input
591                        class=field_class
592                        r#type=itype
593                        inputmode=imode
594                        placeholder=placeholder
595                        prop:value=value
596                        on:input=move |ev| send(Action::Input {
597                            id: id.clone(),
598                            value: InputValue::Text(event_target_value(&ev)),
599                        })
600                    />
601                }
602                .into_any()
603            };
604            view! { <div class="field-wrap">{control}{err_view}</div> }.into_any()
605        }
606        Widget::SearchField { id, placeholder, value } => {
607            let (send, id) = (send.clone(), id.clone());
608            let (placeholder, value) = (placeholder.clone(), value.clone());
609            view! {
610                <div class="searchfield">
611                    <span class="search-icon">{icon_glyph(Icon::Search)}</span>
612                    <input
613                        class="search-input"
614                        placeholder=placeholder
615                        prop:value=value
616                        on:input=move |ev| send(Action::Input {
617                            id: id.clone(),
618                            value: InputValue::Text(event_target_value(&ev)),
619                        })
620                    />
621                </div>
622            }
623            .into_any()
624        }
625        Widget::Segmented { segments } => {
626            let segs: Vec<AnyView> = segments
627                .iter()
628                .map(|s| {
629                    let (send, token) = (send.clone(), s.on_select.clone());
630                    let class = if s.selected { "segment selected" } else { "segment" };
631                    let label = s.label.clone();
632                    view! {
633                        <button class=class on:click=move |_| send(Action::Fired { token: token.clone() })>
634                            {label}
635                        </button>
636                    }
637                    .into_any()
638                })
639                .collect();
640            view! { <div class="segmented">{segs}</div> }.into_any()
641        }
642        Widget::Toggle { id, label, value } => {
643            let (send, id, label, checked) = (send.clone(), id.clone(), label.clone(), *value);
644            view! {
645                <label class="toggle">
646                    {label}
647                    <input
648                        type="checkbox"
649                        role="switch"
650                        prop:checked=checked
651                        on:change=move |ev| send(Action::Input {
652                            id: id.clone(),
653                            value: InputValue::Bool(event_target_checked(&ev)),
654                        })
655                    />
656                </label>
657            }
658            .into_any()
659        }
660        Widget::Checkbox { id, label, value } => {
661            let (send, id, label, checked) = (send.clone(), id.clone(), label.clone(), *value);
662            view! {
663                <label class="check">
664                    <input
665                        type="checkbox"
666                        prop:checked=checked
667                        on:change=move |ev| send(Action::Input {
668                            id: id.clone(),
669                            value: InputValue::Bool(event_target_checked(&ev)),
670                        })
671                    />
672                    {label}
673                </label>
674            }
675            .into_any()
676        }
677        Widget::Slider { id, value, max } => {
678            let (send, id, value, max) = (send.clone(), id.clone(), *value, *max);
679            view! {
680                <input
681                    class="slider"
682                    type="range"
683                    min="0"
684                    max=max
685                    prop:value=value
686                    on:input=move |ev| send(Action::Input {
687                        id: id.clone(),
688                        value: InputValue::Int(event_target_value(&ev).parse().unwrap_or(0)),
689                    })
690                />
691            }
692            .into_any()
693        }
694        Widget::Stepper { value, on_decrement, on_increment } => {
695            let send_dec = send.clone();
696            let send_inc = send.clone();
697            let (dec, inc) = (on_decrement.clone(), on_increment.clone());
698            view! {
699                <div class="stepper">
700                    <button on:click=move |_| send_dec(Action::Fired { token: dec.clone() })>"−"</button>
701                    <span class="stepper-value">{*value}</span>
702                    <button on:click=move |_| send_inc(Action::Fired { token: inc.clone() })>"+"</button>
703                </div>
704            }
705            .into_any()
706        }
707
708        // ---- shell ----
709        Widget::Scaffold { title, body, tabs, back, dark_mode, theme, fab, sheet, on_refresh, refreshing, route, depth } => {
710            let back_btn = back.clone().map(|token| {
711                let send = send.clone();
712                view! {
713                    <button class="back" on:click=move |_| send(Action::Fired { token: token.clone() })>
714                        "‹"
715                    </button>
716                }
717            });
718            let tabbar = (!tabs.is_empty()).then(|| {
719                let tabs: Vec<AnyView> = tabs
720                    .iter()
721                    .map(|tab| {
722                        let (send, token) = (send.clone(), tab.on_select.clone());
723                        let class = if tab.selected { "tab selected" } else { "tab" };
724                        let label = tab.label.clone();
725                        // Optional leading icon → glyph above the label (icon tab bar).
726                        let icon = tab.icon.map(|i| view! { <span class="tab-icon">{icon_glyph(i)}</span> });
727                        view! {
728                            <button class=class on:click=move |_| send(Action::Fired { token: token.clone() })>
729                                {icon}
730                                <span class="tab-label">{label}</span>
731                            </button>
732                        }
733                        .into_any()
734                    })
735                    .collect();
736                view! { <div class="tabbar">{tabs}</div> }
737            });
738            // Floating action button — the raised primary action, anchored over the body.
739            let fab_btn = fab.clone().map(|f| {
740                let (send, token) = (send.clone(), f.on_press.clone());
741                view! {
742                    <button class="fab" on:click=move |_| send(Action::Fired { token: token.clone() })>
743                        {icon_glyph(f.icon)}
744                    </button>
745                }
746            });
747            // Modal bottom sheet — a scrim (tap to dismiss) + a panel rising from the bottom.
748            let sheet_overlay = sheet.as_ref().map(|s| {
749                let (send_scrim, dismiss) = (send.clone(), s.on_dismiss.clone());
750                let (title, child) = (s.title.clone(), render(&s.child, send));
751                view! {
752                    <div class="sheet-scrim" on:click=move |_| send_scrim(Action::Fired { token: dismiss.clone() })></div>
753                    <div class="sheet">
754                        <div class="sheet-handle"></div>
755                        <div class="sheet-title">{title}</div>
756                        {child}
757                    </div>
758                }
759            });
760            // `theme-dark` flips the CSS variables for the whole shell — theme-as-data,
761            // the web twin of the native shells' `preferredColorScheme`/Material theme.
762            let class = if *dark_mode { "scaffold theme-dark" } else { "scaffold" };
763            // Pull-to-refresh — web has no pull gesture, so expose a top-bar refresh button +
764            // an indeterminate bar at the top of the body while `refreshing`.
765            let refresh_btn = on_refresh.clone().map(|token| {
766                let send = send.clone();
767                view! {
768                    <button class="refresh-btn" on:click=move |_| send(Action::Fired { token: token.clone() })>"↻"</button>
769                }
770            });
771            let refresh_bar = refreshing.then(|| {
772                view! { <div class="progress progress-indeterminate"><div class="progress-bar"></div></div> }
773            });
774            let body_class = format!("scaffold-body {}", nav_class(route, *depth));
775            // An app `Theme` overrides the CSS variables inline (brand color, corner, density,
776            // font) — the web twin of the native shells' brand/tint + shape + spacing + font.
777            let theme_style = theme.as_ref().map(theme_css).unwrap_or_default();
778            let (title, body) = (title.clone(), render(body, send));
779            view! {
780                <div class=class style=theme_style>
781                    <div class="topbar">
782                        {back_btn}
783                        <span class="title">{title}</span>
784                        {refresh_btn}
785                    </div>
786                    <div class=body_class data-route=route.clone()>{refresh_bar}{body}</div>
787                    {fab_btn}
788                    {tabbar}
789                    {sheet_overlay}
790                </div>
791            }
792            .into_any()
793        }
794    }
795}
796
797/// Render a slice of children as sibling views.
798fn render_all(children: &[Widget], send: &Dispatch) -> Vec<AnyView> {
799    children.iter().map(|c| render(c, send)).collect()
800}
801
802thread_local! {
803    /// (previous route key, previous depth, alternating toggle). The render is a
804    /// stateless whole-tree rebuild, so nav state lives here (wasm is single-
805    /// threaded). Lets the Scaffold body animate on navigation — the web twin of
806    /// the native shells keying their body on `route`.
807    static NAV: RefCell<(String, u32, bool)> = const { RefCell::new((String::new(), 0, false)) };
808}
809
810/// Render an app [`Theme`] as inline CSS custom properties on the scaffold root — the web
811/// twin of the native brand/tint + shape + spacing + font. Overrides `mobiler.css`'s defaults
812/// (its rules read these via `var(--…)`); dark mode still works (it only swaps the colors the
813/// seed doesn't pin).
814fn theme_css(t: &Theme) -> String {
815    let (r, g, b) = (t.seed.r, t.seed.g, t.seed.b);
816    let radius = match t.corner {
817        Corner::None => "0px",
818        Corner::Small => "8px",
819        Corner::Medium => "14px",
820        Corner::Large => "22px",
821    };
822    let (gap, pad) = match t.density {
823        Density::Compact => ("8px", "10px"),
824        Density::Comfortable => ("12px", "14px"),
825    };
826    let font = match t.font {
827        FontFamily::System => "system-ui, -apple-system, \"Segoe UI\", Roboto, sans-serif",
828        FontFamily::Rounded => "ui-rounded, \"SF Pro Rounded\", \"Segoe UI\", system-ui, sans-serif",
829        FontFamily::Serif => "ui-serif, Georgia, \"Times New Roman\", serif",
830        FontFamily::Monospace => "ui-monospace, \"SF Mono\", \"Cascadia Code\", Menlo, monospace",
831    };
832    // Secondary brand color (for the CardStyle::Brand gradient); falls back to the seed.
833    let (ar, ag, ab) = t.accent.map_or((r, g, b), |a| (a.r, a.g, a.b));
834    format!(
835        "--primary:rgb({r},{g},{b});--accent:rgb({r},{g},{b});\
836         --accent2:rgb({ar},{ag},{ab});\
837         --accent-soft:rgba({r},{g},{b},0.16);--radius:{radius};\
838         --gap:{gap};--pad:{pad};--font:{font};"
839    )
840}
841
842/// Pick the Scaffold body's transition class for this render. Returns `""` for a
843/// same-route data update (re-render in place, no transition). On a route change it
844/// returns a directional class — slide-in from the right when `depth` grew (push),
845/// from the left when it shrank (pop), a crossfade for a lateral move — and *alternates*
846/// the `-a`/`-b` suffix each navigation so the CSS animation restarts even though
847/// Leptos reuses the same DOM node.
848fn nav_class(route: &str, depth: u32) -> &'static str {
849    NAV.with_borrow_mut(|(prev_route, prev_depth, toggle)| {
850        if route == prev_route {
851            return "";
852        }
853        let dir = if depth > *prev_depth {
854            ["nav-push-a", "nav-push-b"]
855        } else if depth < *prev_depth {
856            ["nav-pop-a", "nav-pop-b"]
857        } else {
858            ["nav-fade-a", "nav-fade-b"]
859        };
860        *toggle = !*toggle;
861        *prev_route = route.to_string();
862        *prev_depth = depth;
863        dir[usize::from(*toggle)]
864    })
865}
866
867// ---- style intent → CSS class / glyph (the only place that names the look) ----
868
869fn text_class(s: TextStyle) -> &'static str {
870    match s {
871        TextStyle::Title => "t-title",
872        TextStyle::Subtitle => "t-subtitle",
873        TextStyle::Caption => "t-caption",
874        TextStyle::Emphasis => "t-emphasis",
875        TextStyle::Body => "t-body",
876    }
877}
878
879fn button_class(s: ButtonStyle) -> &'static str {
880    match s {
881        ButtonStyle::Filled => "btn-filled",
882        ButtonStyle::Outlined => "btn-outlined",
883        ButtonStyle::Text => "btn-text",
884    }
885}
886
887fn card_class(s: CardStyle) -> &'static str {
888    match s {
889        CardStyle::Elevated => "card-elevated",
890        CardStyle::Outlined => "card-outlined",
891        CardStyle::Filled => "card-filled",
892        CardStyle::Brand => "card-brand",
893    }
894}
895
896fn tone_class(t: Tone) -> &'static str {
897    match t {
898        Tone::Neutral => "tone-neutral",
899        Tone::Success => "tone-success",
900        Tone::Warning => "tone-warning",
901        Tone::Danger => "tone-danger",
902        Tone::Info => "tone-info",
903    }
904}
905
906fn spacer_class(s: Spacing) -> &'static str {
907    match s {
908        Spacing::Xs => "sp-xs",
909        Spacing::Sm => "sp-sm",
910        Spacing::Md => "sp-md",
911        Spacing::Lg => "sp-lg",
912        Spacing::Xl => "sp-xl",
913    }
914}
915
916fn icon_glyph(i: Icon) -> &'static str {
917    match i {
918        Icon::Delete => "🗑",
919        Icon::Add => "＋",
920        Icon::Edit => "✏️",
921        Icon::Close => "✕",
922        Icon::Settings => "⚙",
923        Icon::Check => "✓",
924        Icon::Star => "★",
925        Icon::Info => "ℹ",
926        Icon::Home => "⌂",
927        Icon::Search => "🔍",
928        Icon::Menu => "☰",
929        Icon::Filter => "⚟",
930        Icon::Back => "‹",
931        Icon::Forward => "›",
932        Icon::Down => "⌄",
933        Icon::Bell => "🔔",
934        Icon::Cart => "🛒",
935        Icon::Share => "↗",
936        Icon::Heart => "♡",
937        Icon::HeartFilled => "♥",
938        Icon::Person => "👤",
939        Icon::People => "👥",
940        Icon::Phone => "📞",
941        Icon::Mail => "✉",
942        Icon::Calendar => "📅",
943        Icon::Clock => "🕑",
944        Icon::MapPin => "📍",
945        Icon::Camera => "📷",
946        Icon::Photo => "🖼",
947        Icon::Play => "▶",
948        Icon::Scissors => "✂",
949    }
950}
951
952fn image_class(shape: ImageShape, ratio: ImageRatio) -> String {
953    let shape = match shape {
954        ImageShape::Square => "img-square",
955        ImageShape::Rounded => "img-rounded",
956        ImageShape::Circle => "img-circle",
957    };
958    let ratio = match ratio {
959        ImageRatio::Wide => "ratio-wide",
960        ImageRatio::Square => "ratio-square",
961        ImageRatio::Tall => "ratio-tall",
962    };
963    format!("img {shape} {ratio}")
964}
965
966fn dot_class(c: ProjectColor) -> &'static str {
967    match c {
968        ProjectColor::Indigo => "dot-indigo",
969        ProjectColor::Teal => "dot-teal",
970        ProjectColor::Coral => "dot-coral",
971        ProjectColor::Amber => "dot-amber",
972        ProjectColor::Lime => "dot-lime",
973        ProjectColor::Pink => "dot-pink",
974    }
975}
976
977fn align_class(a: BoxAlign) -> &'static str {
978    match a {
979        BoxAlign::TopStart => "align-top-start",
980        BoxAlign::TopEnd => "align-top-end",
981        BoxAlign::Center => "align-center",
982        BoxAlign::BottomStart => "align-bottom-start",
983        BoxAlign::BottomCenter => "align-bottom-center",
984        BoxAlign::BottomEnd => "align-bottom-end",
985    }
986}
987
988// ------------------------------- charts -------------------------------
989
990/// Distinct fallback colors for series 1.. (series 0 with no override rides the theme accent).
991const CHART_PALETTE: [&str; 6] = ["#E0772C", "#2EA06A", "#C0466B", "#8A5CC0", "#C9A227", "#3FA7D6"];
992
993fn hex(c: Rgb) -> String {
994    format!("#{:02x}{:02x}{:02x}", c.r, c.g, c.b)
995}
996
997/// Color for series `i`: explicit override → theme accent (i==0) → palette.
998fn chart_color(i: usize, s: &ChartSeries) -> String {
999    match s.color {
1000        Some(c) => hex(c),
1001        None if i == 0 => "var(--accent, #5C6BC0)".to_string(),
1002        None => CHART_PALETTE[(i - 1) % CHART_PALETTE.len()].to_string(),
1003    }
1004}
1005
1006/// A series' single magnitude for circular charts (sum of its values).
1007fn chart_mag(s: &ChartSeries) -> f32 {
1008    s.values.iter().copied().sum()
1009}
1010
1011/// Point on a circle: `ang` in radians, 0 = top (12 o'clock), increasing clockwise.
1012fn polar(cx: f32, cy: f32, r: f32, ang: f32) -> (f32, f32) {
1013    (cx + r * ang.sin(), cy - r * ang.cos())
1014}
1015
1016/// An open arc path (for ring/donut/gauge strokes).
1017fn arc_path(cx: f32, cy: f32, r: f32, a0: f32, a1: f32) -> String {
1018    let (x0, y0) = polar(cx, cy, r, a0);
1019    let (x1, y1) = polar(cx, cy, r, a1);
1020    let large = if (a1 - a0).abs() > std::f32::consts::PI { 1 } else { 0 };
1021    format!("M {x0:.2} {y0:.2} A {r:.2} {r:.2} 0 {large} 1 {x1:.2} {y1:.2}")
1022}
1023
1024/// A filled wedge from the center (for pie/donut slices).
1025fn wedge_path(cx: f32, cy: f32, r: f32, a0: f32, a1: f32) -> String {
1026    let (x0, y0) = polar(cx, cy, r, a0);
1027    let (x1, y1) = polar(cx, cy, r, a1);
1028    let large = if (a1 - a0).abs() > std::f32::consts::PI { 1 } else { 0 };
1029    format!("M {cx:.2} {cy:.2} L {x0:.2} {y0:.2} A {r:.2} {r:.2} 0 {large} 1 {x1:.2} {y1:.2} Z")
1030}
1031
1032fn fmt_tick(v: f32) -> String {
1033    if (v - v.round()).abs() < 0.05 { format!("{}", v.round() as i64) } else { format!("{v:.1}") }
1034}
1035
1036fn is_cartesian(style: ChartStyle) -> bool {
1037    matches!(style, ChartStyle::Bar | ChartStyle::Line | ChartStyle::StackedBar | ChartStyle::StackedBar100)
1038}
1039
1040/// The y-axis denominator for a cartesian chart.
1041fn cartesian_max(series: &[ChartSeries], style: ChartStyle, nslots: usize) -> f32 {
1042    match style {
1043        ChartStyle::StackedBar => (0..nslots)
1044            .map(|j| series.iter().map(|s| *s.values.get(j).unwrap_or(&0.0)).sum::<f32>())
1045            .fold(0.0, f32::max)
1046            .max(1e-6),
1047        ChartStyle::StackedBar100 => 1.0,
1048        _ => series.iter().flat_map(|s| s.values.iter().copied()).fold(0.0, f32::max).max(1e-6),
1049    }
1050}
1051
1052fn cartesian_svg(series: &[ChartSeries], style: ChartStyle, axis: bool, max: f32, nslots: usize) -> AnyView {
1053    // plot area: y in [2, 48] of the 0..50 viewBox
1054    let mut nodes: Vec<AnyView> = Vec::new();
1055    if axis {
1056        for k in 0..=4 {
1057            let y = 2.0 + k as f32 * (46.0 / 4.0);
1058            nodes.push(view! { <line x1="0" y1=format!("{y:.2}") x2="100" y2=format!("{y:.2}") class="chart-gridline"></line> }.into_any());
1059        }
1060    }
1061    match style {
1062        ChartStyle::Line => {
1063            for (i, s) in series.iter().enumerate() {
1064                let n = s.values.len().max(1);
1065                let pts = s.values.iter().enumerate().map(|(j, v)| {
1066                    let x = if n == 1 { 50.0 } else { j as f32 * (100.0 / (n as f32 - 1.0)) };
1067                    let y = 2.0 + (1.0 - (v / max).clamp(0.0, 1.0)) * 46.0;
1068                    format!("{x:.2},{y:.2}")
1069                }).collect::<Vec<_>>().join(" ");
1070                let st = format!("fill:none;stroke:{};stroke-width:1.5;vector-effect:non-scaling-stroke", chart_color(i, s));
1071                nodes.push(view! { <polyline points=pts style=st></polyline> }.into_any());
1072            }
1073        }
1074        ChartStyle::Bar => {
1075            let sw = 100.0 / nslots as f32;
1076            let ns = series.len().max(1);
1077            for (i, s) in series.iter().enumerate() {
1078                let st = format!("fill:{}", chart_color(i, s));
1079                for (j, v) in s.values.iter().enumerate() {
1080                    let h = (v / max).clamp(0.0, 1.0) * 46.0;
1081                    let bw = sw * 0.8 / ns as f32;
1082                    let x = j as f32 * sw + sw * 0.1 + i as f32 * bw;
1083                    let y = 48.0 - h;
1084                    nodes.push(view! { <rect x=format!("{x:.2}") y=format!("{y:.2}") width=format!("{bw:.2}") height=format!("{h:.2}") style=st.clone()></rect> }.into_any());
1085                }
1086            }
1087        }
1088        ChartStyle::StackedBar | ChartStyle::StackedBar100 => {
1089            let sw = 100.0 / nslots as f32;
1090            for j in 0..nslots {
1091                let slot_total = series.iter().map(|s| *s.values.get(j).unwrap_or(&0.0)).sum::<f32>().max(1e-6);
1092                let denom = if matches!(style, ChartStyle::StackedBar100) { slot_total } else { max };
1093                let mut acc = 0.0_f32;
1094                for (i, s) in series.iter().enumerate() {
1095                    let v = *s.values.get(j).unwrap_or(&0.0);
1096                    let h = (v / denom).clamp(0.0, 1.0) * 46.0;
1097                    let x = j as f32 * sw + sw * 0.15;
1098                    let bw = sw * 0.7;
1099                    let y = 48.0 - acc - h;
1100                    let st = format!("fill:{}", chart_color(i, s));
1101                    nodes.push(view! { <rect x=format!("{x:.2}") y=format!("{y:.2}") width=format!("{bw:.2}") height=format!("{h:.2}") style=st></rect> }.into_any());
1102                    acc += h;
1103                }
1104            }
1105        }
1106        _ => {}
1107    }
1108    view! { <svg viewBox="0 0 100 50" preserveAspectRatio="none" class="chart-svg">{nodes}</svg> }.into_any()
1109}
1110
1111fn circular_svg(series: &[ChartSeries], style: ChartStyle) -> AnyView {
1112    use std::f32::consts::PI;
1113    let mut nodes: Vec<AnyView> = Vec::new();
1114    match style {
1115        ChartStyle::Pie | ChartStyle::Donut => {
1116            let total = series.iter().map(chart_mag).sum::<f32>().max(1e-6);
1117            let mut a = 0.0_f32;
1118            for (i, s) in series.iter().enumerate() {
1119                let frac = chart_mag(s) / total;
1120                let st = format!("fill:{}", chart_color(i, s));
1121                if frac >= 0.999 {
1122                    nodes.push(view! { <circle cx="50" cy="50" r="45" style=st></circle> }.into_any());
1123                } else if frac > 0.0 {
1124                    let d = wedge_path(50.0, 50.0, 45.0, a, a + frac * 2.0 * PI);
1125                    nodes.push(view! { <path d=d style=st></path> }.into_any());
1126                }
1127                a += frac * 2.0 * PI;
1128            }
1129            if matches!(style, ChartStyle::Donut) {
1130                nodes.push(view! { <circle cx="50" cy="50" r="24" style="fill:var(--surface, #ffffff)"></circle> }.into_any());
1131            }
1132        }
1133        ChartStyle::Rings => {
1134            let n = series.len().max(1);
1135            for (i, s) in series.iter().enumerate() {
1136                let r = 45.0 - i as f32 * (34.0 / n as f32);
1137                let goal = s.goal.unwrap_or_else(|| chart_mag(s)).max(1e-6);
1138                let prog = (chart_mag(s) / goal).clamp(0.0, 1.0);
1139                nodes.push(view! { <circle cx="50" cy="50" r=format!("{r:.2}") style="fill:none;stroke:var(--border, #e6e6e6);stroke-width:6"></circle> }.into_any());
1140                let st = format!("fill:none;stroke:{};stroke-width:6;stroke-linecap:round", chart_color(i, s));
1141                if prog >= 0.999 {
1142                    nodes.push(view! { <circle cx="50" cy="50" r=format!("{r:.2}") style=st></circle> }.into_any());
1143                } else if prog > 0.0 {
1144                    let d = arc_path(50.0, 50.0, r, 0.0, prog * 2.0 * PI);
1145                    nodes.push(view! { <path d=d style=st></path> }.into_any());
1146                }
1147            }
1148        }
1149        ChartStyle::Gauge => {
1150            let s = match series.first() { Some(s) => s, None => return view! { <svg viewBox="0 0 100 100" class="chart-svg"></svg> }.into_any() };
1151            let goal = s.goal.unwrap_or_else(|| chart_mag(s)).max(1e-6);
1152            let prog = (chart_mag(s) / goal).clamp(0.0, 1.0);
1153            let a0 = -0.75 * PI; // 270° sweep, gap at the bottom
1154            let a1 = 0.75 * PI;
1155            nodes.push(view! { <path d=arc_path(50.0, 50.0, 42.0, a0, a1) style="fill:none;stroke:var(--border, #e6e6e6);stroke-width:8;stroke-linecap:round"></path> }.into_any());
1156            if prog > 0.0 {
1157                let st = format!("fill:none;stroke:{};stroke-width:8;stroke-linecap:round", chart_color(0, s));
1158                nodes.push(view! { <path d=arc_path(50.0, 50.0, 42.0, a0, a0 + prog * 1.5 * PI) style=st></path> }.into_any());
1159            }
1160            let pct = format!("{}%", (prog * 100.0).round() as i64);
1161            nodes.push(view! { <text x="50" y="56" style="fill:var(--fg, #222);font-size:20px;font-weight:700;text-anchor:middle">{pct}</text> }.into_any());
1162        }
1163        _ => {}
1164    }
1165    view! { <svg viewBox="0 0 100 100" preserveAspectRatio="xMidYMid meet" class="chart-svg">{nodes}</svg> }.into_any()
1166}
1167
1168fn chart_view(series: &[ChartSeries], labels: &[String], style: ChartStyle, axis: bool, legend: bool) -> AnyView {
1169    let cartesian = is_cartesian(style);
1170    let nslots = series.iter().map(|s| s.values.len()).max().unwrap_or(0).max(1);
1171    let max = cartesian_max(series, style, nslots);
1172
1173    let plot = if cartesian {
1174        let svg = cartesian_svg(series, style, axis, max, nslots);
1175        let yaxis = if axis {
1176            let ticks: Vec<_> = [max, max / 2.0, 0.0].iter()
1177                .map(|t| view! { <span class="chart-tick">{fmt_tick(*t)}</span> })
1178                .collect();
1179            Some(view! { <div class="chart-yaxis">{ticks}</div> })
1180        } else {
1181            None
1182        };
1183        view! { <div class="chart-plot">{yaxis}{svg}</div> }.into_any()
1184    } else {
1185        circular_svg(series, style).into_any()
1186    };
1187
1188    let label_row = if cartesian && !labels.is_empty() {
1189        let items: Vec<_> = labels.iter().map(|l| view! { <span class="chart-label">{l.clone()}</span> }).collect();
1190        Some(view! { <div class="chart-labels">{items}</div> })
1191    } else {
1192        None
1193    };
1194
1195    let legend_row = if legend {
1196        let items: Vec<_> = series.iter().enumerate().map(|(i, s)| {
1197            let sw = format!("background:{}", chart_color(i, s));
1198            let name = s.name.clone();
1199            view! { <span class="chart-legend-item"><span class="chart-swatch" style=sw></span>{name}</span> }
1200        }).collect();
1201        Some(view! { <div class="chart-legend">{items}</div> })
1202    } else {
1203        None
1204    };
1205
1206    view! { <div class="chart">{plot}{label_row}{legend_row}</div> }.into_any()
1207}
1208
1209// --------------------------- region chart ---------------------------
1210
1211/// Palette as RGB (parallel to `CHART_PALETTE`) so region charts can compute label contrast.
1212const CHART_PALETTE_RGB: [(u8, u8, u8); 6] =
1213    [(0xE0, 0x77, 0x2C), (0x2E, 0xA0, 0x6A), (0xC0, 0x46, 0x6B), (0x8A, 0x5C, 0xC0), (0xC9, 0xA2, 0x27), (0x3F, 0xA7, 0xD6)];
1214
1215/// The resolved fill RGB for region `i` (explicit override → palette).
1216fn region_rgb(i: usize, r: &ChartRegion) -> (u8, u8, u8) {
1217    match r.color {
1218        Some(c) => (c.r, c.g, c.b),
1219        None => CHART_PALETTE_RGB[i % CHART_PALETTE_RGB.len()],
1220    }
1221}
1222
1223/// Black or white label text, whichever reads on the given fill (perceived luminance).
1224fn contrast_text((r, g, b): (u8, u8, u8)) -> &'static str {
1225    let lum = 0.299 * r as f32 + 0.587 * g as f32 + 0.114 * b as f32;
1226    if lum > 140.0 { "#1a1a1a" } else { "#f5f5f5" }
1227}
1228
1229fn region_color(i: usize, r: &ChartRegion) -> String {
1230    let (r8, g8, b8) = region_rgb(i, r);
1231    format!("#{r8:02x}{g8:02x}{b8:02x}")
1232}
1233
1234// A variable-width stacked-region / coverage-gap chart: absolute-positioned region rectangles in
1235// the [0,x_max]×[0,y_max] plane, horizontal ref lines + chips, an irregular x-axis, an optional
1236// right-side bracket, and a legend. The web twin of the Compose/SwiftUI RegionChart renderers.
1237fn region_chart_view(
1238    regions: &[ChartRegion],
1239    ticks: &[ChartTick],
1240    x_max: f32,
1241    y_max: f32,
1242    ref_lines: &[ChartRefLine],
1243    bracket: &Option<ChartBracket>,
1244    legend: &[ChartLegendItem],
1245) -> AnyView {
1246    let xm = x_max.max(1e-6);
1247    let ym = y_max.max(1e-6);
1248
1249    let region_divs: Vec<_> = regions.iter().enumerate().map(|(i, r)| {
1250        let left = (r.x0 / xm * 100.0).clamp(0.0, 100.0);
1251        let width = ((r.x1 - r.x0) / xm * 100.0).clamp(0.0, 100.0);
1252        let bottom = (r.y0 / ym * 100.0).clamp(0.0, 100.0);
1253        let height = ((r.y1 - r.y0) / ym * 100.0).clamp(0.0, 100.0);
1254        let style = format!("left:{left:.3}%;width:{width:.3}%;bottom:{bottom:.3}%;height:{height:.3}%;background:{}", region_color(i, r));
1255        let label_class = if r.vertical { "rchart-label rchart-label-v" } else { "rchart-label" };
1256        let label_style = format!("color:{}", contrast_text(region_rgb(i, r)));
1257        let label = r.label.clone();
1258        view! { <div class="rchart-region" style=style><span class=label_class style=label_style>{label}</span></div> }
1259    }).collect();
1260
1261    // The reference lines span the full plot width; their value chips sit in the right margin
1262    // (outside the plot), like the original — so the line clearly runs to the plot's edge.
1263    let ref_line_divs: Vec<_> = ref_lines.iter().map(|rl| {
1264        let style = format!("bottom:{:.3}%", (rl.value / ym * 100.0).clamp(0.0, 100.0));
1265        let cls = if rl.dashed { "rchart-refline rchart-refline-dashed" } else { "rchart-refline" };
1266        view! { <div class=cls style=style></div> }
1267    }).collect();
1268    let chip_divs: Vec<_> = ref_lines.iter().map(|rl| {
1269        let style = format!("bottom:{:.3}%", (rl.value / ym * 100.0).clamp(0.0, 100.0));
1270        let label = rl.label.clone();
1271        view! { <div class="rchart-chip" style=style>{label}</div> }
1272    }).collect();
1273
1274    let bracket_div = bracket.as_ref().map(|b| {
1275        let bottom = (b.y0 / ym * 100.0).clamp(0.0, 100.0);
1276        let height = ((b.y1 - b.y0) / ym * 100.0).clamp(0.0, 100.0);
1277        let style = format!("bottom:{bottom:.3}%;height:{height:.3}%");
1278        let label = if b.info { format!("ⓘ\n{}", b.label) } else { b.label.clone() };
1279        view! { <div class="rchart-bracket" style=style><span>{label}</span></div> }
1280    });
1281
1282    let yticks: Vec<_> = (0..=4).rev().map(|k| {
1283        let v = ym * k as f32 / 4.0;
1284        view! { <span class="chart-tick">{fmt_tick(v)}</span> }
1285    }).collect();
1286
1287    let xticks: Vec<_> = ticks.iter().map(|t| {
1288        let style = format!("left:{:.3}%", (t.at / xm * 100.0).clamp(0.0, 100.0));
1289        let label = t.label.clone();
1290        view! { <span class="rchart-xtick" style=style>{label}</span> }
1291    }).collect();
1292
1293    // Axis tick marks (notches on the L-shaped axis): horizontal on the y-axis at each value,
1294    // vertical on the x-axis at each irregular break — drawn over the bands at the plot edges.
1295    let ytick_marks: Vec<_> = (0..=4).map(|k| {
1296        let style = format!("bottom:{:.3}%", k as f32 * 25.0);
1297        view! { <div class="rchart-ytick" style=style></div> }
1298    }).collect();
1299    let xtick_marks: Vec<_> = ticks.iter().map(|t| {
1300        let style = format!("left:{:.3}%", (t.at / xm * 100.0).clamp(0.0, 100.0));
1301        view! { <div class="rchart-xtickmark" style=style></div> }
1302    }).collect();
1303
1304    let legend_row = if legend.is_empty() {
1305        None
1306    } else {
1307        let items: Vec<_> = legend.iter().map(|l| {
1308            let sw = format!("background:{}", hex(l.color));
1309            let name = l.label.clone();
1310            view! { <span class="chart-legend-item"><span class="chart-swatch" style=sw></span>{name}</span> }
1311        }).collect();
1312        Some(view! { <div class="chart-legend">{items}</div> })
1313    };
1314
1315    view! {
1316        <div class="rchart">
1317            <div class="rchart-row">
1318                <div class="rchart-yaxis">{yticks}</div>
1319                <div class="rchart-plotwrap">
1320                    <div class="rchart-plot">{region_divs}{ytick_marks}{xtick_marks}{ref_line_divs}</div>
1321                    {chip_divs}{bracket_div}
1322                </div>
1323            </div>
1324            <div class="rchart-xaxis">{xticks}</div>
1325            {legend_row}
1326        </div>
1327    }.into_any()
1328}
mobiler_web/lib.rs

mobiler_web/
lib.rs
