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lib.rs
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lib.rs
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//! Demo app for egui
mod apps;
mod backend_panel;
pub(crate) mod frame_history;
mod wrap_app;
#[cfg(target_arch = "wasm32")]
use eframe::web::AppRunnerRef;
pub use wrap_app::WrapApp;
/// Time of day as seconds since midnight. Used for clock in demo app.
pub(crate) fn seconds_since_midnight() -> f64 {
use chrono::Timelike;
let time = chrono::Local::now().time();
time.num_seconds_from_midnight() as f64 + 1e-9 * (time.nanosecond() as f64)
}
// ----------------------------------------------------------------------------
#[cfg(target_arch = "wasm32")]
use eframe::wasm_bindgen::{self, prelude::*};
#[cfg(target_arch = "wasm32")]
#[wasm_bindgen]
pub struct WebHandle {
handle: AppRunnerRef,
}
#[cfg(target_arch = "wasm32")]
#[wasm_bindgen]
impl WebHandle {
#[wasm_bindgen]
#[cfg(target_arch = "wasm32")]
pub fn stop_web(&self) -> Result<(), wasm_bindgen::JsValue> {
let mut app = self.handle.lock();
let res = app.destroy();
// let numw = Arc::weak_count(&app);
// let nums = Arc::strong_count(&app);
// tracing::debug!("runner ref {:?}, {:?}", numw, nums);
res
}
}
#[cfg(target_arch = "wasm32")]
#[wasm_bindgen]
pub fn init_wasm_hooks() {
// Make sure panics are logged using `console.error`.
console_error_panic_hook::set_once();
// Redirect tracing to console.log and friends:
tracing_wasm::set_as_global_default();
}
#[cfg(target_arch = "wasm32")]
#[wasm_bindgen]
pub fn start_separate(canvas_id: &str) -> Result<WebHandle, wasm_bindgen::JsValue> {
let web_options = eframe::WebOptions::default();
let handle = eframe::start_web(
canvas_id,
web_options,
Box::new(|cc| Box::new(WrapApp::new(cc))),
)
.map(|handle| WebHandle { handle });
handle
}
/// This is the entry-point for all the web-assembly.
/// This is called once from the HTML.
/// It loads the app, installs some callbacks, then returns.
/// You can add more callbacks like this if you want to call in to your code.
#[cfg(target_arch = "wasm32")]
#[wasm_bindgen]
pub fn start(canvas_id: &str) -> Result<WebHandle, wasm_bindgen::JsValue> {
init_wasm_hooks();
start_separate(canvas_id)
}