47 lines
1.1 KiB
Rust
47 lines
1.1 KiB
Rust
//! Utility functions for the web backend.
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use wasm_bindgen::JsValue;
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#[derive(Debug)]
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pub struct JsError {
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value: JsValue,
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}
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impl std::fmt::Display for JsError {
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fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
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write!(f, "JS exception: {:?}", self)
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}
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}
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impl std::error::Error for JsError {}
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pub trait JsResult<T> {
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/// Converts a `JsValue` into a standard `Error`.
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fn warn_on_error(&self);
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fn into_js_result(self) -> Result<T, JsError>;
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}
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impl<T> JsResult<T> for Result<T, JsValue> {
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#[inline]
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fn warn_on_error(&self) {
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if let Err(value) = self {
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log::warn!("Unexpected JavaScript error: {:?}", value);
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}
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}
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#[inline]
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fn into_js_result(self) -> Result<T, JsError> {
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self.map_err(|value| JsError { value })
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}
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}
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/// Very bad way to guess if we're running on a tablet/mobile.
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pub fn is_mobile_or_tablet() -> bool {
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if let Some(window) = web_sys::window() {
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if let Ok(val) = js_sys::Reflect::get(&window, &JsValue::from("orientation")) {
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return !val.is_undefined();
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}
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}
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false
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}
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