util.rs
| 1 | //! Formatting + small browser helpers. |
| 2 | |
| 3 | use leptos::prelude::*; |
| 4 | use wasm_bindgen::JsValue; |
| 5 | |
| 6 | /// A window event listener that is removed when the current owner is disposed. |
| 7 | /// |
| 8 | /// Leptos' `window_event_listener` returns a `WindowListenerHandle` with no |
| 9 | /// `Drop` impl — if the owning component is unmounted without an explicit |
| 10 | /// `remove()`, the listener keeps firing on `window` and panics by reading |
| 11 | /// the component's now-disposed signals. |
| 12 | pub fn owned_window_listener<E: leptos::ev::EventDescriptor + 'static>( |
| 13 | event: E, |
| 14 | cb: impl Fn(E::EventType) + 'static, |
| 15 | ) where |
| 16 | E::EventType: wasm_bindgen::JsCast, |
| 17 | { |
| 18 | let handle = window_event_listener(event, cb); |
| 19 | on_cleanup(move || handle.remove()); |
| 20 | } |
| 21 | |
| 22 | pub fn format_size(bytes: u64) -> String { |
| 23 | const UNITS: [&str; 5] = ["B", "KB", "MB", "GB", "TB"]; |
| 24 | let mut v = bytes as f64; |
| 25 | let mut i = 0; |
| 26 | while v >= 1024.0 && i < UNITS.len() - 1 { |
| 27 | v /= 1024.0; |
| 28 | i += 1; |
| 29 | } |
| 30 | if i == 0 { |
| 31 | format!("{bytes} B") |
| 32 | } else { |
| 33 | format!("{v:.1} {}", UNITS[i]) |
| 34 | } |
| 35 | } |
| 36 | |
| 37 | /// Format an RFC 3339 timestamp as "YYYY-MM-DD HH:MM" (UTC) for display. |
| 38 | /// Falls back to the raw string when it cannot be parsed. |
| 39 | pub fn format_date(rfc3339: &str) -> String { |
| 40 | let d = js_sys::Date::new(&JsValue::from_str(rfc3339)); |
| 41 | if d.get_time().is_nan() { |
| 42 | return rfc3339.to_string(); |
| 43 | } |
| 44 | fn pad(n: u32) -> String { |
| 45 | if n < 10 { |
| 46 | format!("0{n}") |
| 47 | } else { |
| 48 | n.to_string() |
| 49 | } |
| 50 | } |
| 51 | format!( |
| 52 | "{:04}-{}-{} {}:{}", |
| 53 | d.get_utc_full_year(), |
| 54 | pad(d.get_utc_month() + 1), |
| 55 | pad(d.get_utc_date()), |
| 56 | pad(d.get_utc_hours()), |
| 57 | pad(d.get_utc_minutes()), |
| 58 | ) |
| 59 | } |
| 60 | |
| 61 | pub fn storage_get(key: &str) -> Option<String> { |
| 62 | let w = web_sys::window()?; |
| 63 | let storage_opt = w.local_storage().ok()?; |
| 64 | let storage = storage_opt.as_ref()?; |
| 65 | storage.get_item(key).ok().flatten() |
| 66 | } |
| 67 | |
| 68 | pub fn storage_set(key: &str, value: &str) { |
| 69 | if let Some(s) = web_sys::window().and_then(|w| w.local_storage().ok().flatten()) { |
| 70 | let _ = s.set_item(key, value); |
| 71 | } |
| 72 | } |
| 73 | |
| 74 | #[derive(Clone, Copy, PartialEq, Debug)] |
| 75 | pub enum ViewMode { |
| 76 | Grid, |
| 77 | List, |
| 78 | } |
| 79 | |
| 80 | impl ViewMode { |
| 81 | const KEY: &'static str = "fbng.view"; |
| 82 | |
| 83 | pub fn load() -> Self { |
| 84 | match storage_get(Self::KEY).as_deref() { |
| 85 | Some("list") => ViewMode::List, |
| 86 | _ => ViewMode::Grid, |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | pub fn save(self) { |
| 91 | storage_set( |
| 92 | Self::KEY, |
| 93 | if self == ViewMode::List { |
| 94 | "list" |
| 95 | } else { |
| 96 | "grid" |
| 97 | }, |
| 98 | ); |
| 99 | } |
| 100 | } |
| 101 |