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//! eframe - the [`egui`] framework crate
//!
//! If you are planning to write an app for web or native,
//! and want to use [`egui`] for everything, then `eframe` is for you!
//!
//! To get started, see the [examples](https://github.com/emilk/egui/tree/master/examples).
//! To learn how to set up `eframe` for web and native, go to <https://github.com/emilk/eframe_template/> and follow the instructions there!
//!
//! In short, you implement [`App`] (especially [`App::update`]) and then
//! call [`crate::run_native`] from your `main.rs`, and/or call `eframe::start_web` from your `lib.rs`.
//!
//! ## Usage, native:
//! ``` no_run
//! use eframe::egui;
//!
//! fn main() {
//! let native_options = eframe::NativeOptions::default();
//! eframe::run_native("My egui App", native_options, Box::new(|cc| Box::new(MyEguiApp::new(cc))));
//! }
//!
//! #[derive(Default)]
//! struct MyEguiApp {}
//!
//! impl MyEguiApp {
//! fn new(cc: &eframe::CreationContext<'_>) -> Self {
//! // Customize egui here with cc.egui_ctx.set_fonts and cc.egui_ctx.set_visuals.
//! // Restore app state using cc.storage (requires the "persistence" feature).
//! // Use the cc.gl (a glow::Context) to create graphics shaders and buffers that you can use
//! // for e.g. egui::PaintCallback.
//! Self::default()
//! }
//! }
//!
//! impl eframe::App for MyEguiApp {
//! fn update(&mut self, ctx: &egui::Context, frame: &mut eframe::Frame) {
//! egui::CentralPanel::default().show(ctx, |ui| {
//! ui.heading("Hello World!");
//! });
//! }
//! }
//! ```
//!
//! ## Usage, web:
//! ``` no_run
//! #[cfg(target_arch = "wasm32")]
//! use wasm_bindgen::prelude::*;
//!
//! /// Call this once from the HTML.
//! #[cfg(target_arch = "wasm32")]
//! #[wasm_bindgen]
//! pub async fn start(canvas_id: &str) -> Result<AppRunnerRef, eframe::wasm_bindgen::JsValue> {
//! let web_options = eframe::WebOptions::default();
//! eframe::start_web(canvas_id, web_options, Box::new(|cc| Box::new(MyEguiApp::new(cc)))).await
//! }
//! ```
//!
//! ## Feature flags
#![cfg_attr(feature = "document-features", doc = document_features::document_features!())]
//!
#![allow(clippy::needless_doctest_main)]
// Re-export all useful libraries:
pub use {egui, egui::emath, egui::epaint};
#[cfg(feature = "glow")]
pub use {egui_glow, glow};
#[cfg(feature = "wgpu")]
pub use {egui_wgpu, wgpu};
mod epi;
// Re-export everything in `epi` so `eframe` users don't have to care about what `epi` is:
pub use epi::*;
// ----------------------------------------------------------------------------
// When compiling for web
#[cfg(target_arch = "wasm32")]
pub mod web;
#[cfg(target_arch = "wasm32")]
pub use wasm_bindgen;
#[cfg(target_arch = "wasm32")]
use web::AppRunnerRef;
#[cfg(target_arch = "wasm32")]
pub use web_sys;
/// Install event listeners to register different input events
/// and start running the given app.
///
/// ``` no_run
/// #[cfg(target_arch = "wasm32")]
/// use wasm_bindgen::prelude::*;
///
/// /// This is the entry-point for all the web-assembly.
/// /// This is called from the HTML.
/// /// It loads the app, installs some callbacks, then returns.
/// /// It returns a handle to the running app that can be stopped calling `AppRunner::stop_web`.
/// /// You can add more callbacks like this if you want to call in to your code.
/// #[cfg(target_arch = "wasm32")]
/// #[wasm_bindgen]
/// pub struct WebHandle {
/// handle: AppRunnerRef,
/// }
/// #[cfg(target_arch = "wasm32")]
/// #[wasm_bindgen]
/// pub async fn start(canvas_id: &str) -> Result<WebHandle, eframe::wasm_bindgen::JsValue> {
/// let web_options = eframe::WebOptions::default();
/// eframe::start_web(
/// canvas_id,
/// web_options,
/// Box::new(|cc| Box::new(MyEguiApp::new(cc))),
/// )
/// .await
/// .map(|handle| WebHandle { handle })
/// }
/// ```
///
/// # Errors
/// Failing to initialize WebGL graphics.
#[cfg(target_arch = "wasm32")]
pub async fn start_web(
canvas_id: &str,
web_options: WebOptions,
app_creator: AppCreator,
) -> std::result::Result<AppRunnerRef, wasm_bindgen::JsValue> {
let handle = web::start(canvas_id, web_options, app_creator).await?;
Ok(handle)
}
// ----------------------------------------------------------------------------
// When compiling natively
#[cfg(not(target_arch = "wasm32"))]
#[cfg(any(feature = "glow", feature = "wgpu"))]
mod native;
/// This is how you start a native (desktop) app.
///
/// The first argument is name of your app, used for the title bar of the native window
/// and the save location of persistence (see [`App::save`]).
///
/// Call from `fn main` like this:
/// ``` no_run
/// use eframe::egui;
///
/// fn main() {
/// let native_options = eframe::NativeOptions::default();
/// eframe::run_native("MyApp", native_options, Box::new(|cc| Box::new(MyEguiApp::new(cc))));
/// }
///
/// #[derive(Default)]
/// struct MyEguiApp {}
///
/// impl MyEguiApp {
/// fn new(cc: &eframe::CreationContext<'_>) -> Self {
/// // Customize egui here with cc.egui_ctx.set_fonts and cc.egui_ctx.set_visuals.
/// // Restore app state using cc.storage (requires the "persistence" feature).
/// // Use the cc.gl (a glow::Context) to create graphics shaders and buffers that you can use
/// // for e.g. egui::PaintCallback.
/// Self::default()
/// }
/// }
///
/// impl eframe::App for MyEguiApp {
/// fn update(&mut self, ctx: &egui::Context, frame: &mut eframe::Frame) {
/// egui::CentralPanel::default().show(ctx, |ui| {
/// ui.heading("Hello World!");
/// });
/// }
/// }
/// ```
///
/// # Errors
/// This function can fail if we fail to set up a graphics context.
#[cfg(not(target_arch = "wasm32"))]
#[allow(clippy::needless_pass_by_value)]
#[cfg(any(feature = "glow", feature = "wgpu"))]
pub fn run_native(
app_name: &str,
native_options: NativeOptions,
app_creator: AppCreator,
) -> Result<()> {
let renderer = native_options.renderer;
#[cfg(not(feature = "__screenshot"))]
assert!(
std::env::var("EFRAME_SCREENSHOT_TO").is_err(),
"EFRAME_SCREENSHOT_TO found without compiling with the '__screenshot' feature"
);
match renderer {
#[cfg(feature = "glow")]
Renderer::Glow => {
tracing::debug!("Using the glow renderer");
native::run::run_glow(app_name, native_options, app_creator)
}
#[cfg(feature = "wgpu")]
Renderer::Wgpu => {
tracing::debug!("Using the wgpu renderer");
native::run::run_wgpu(app_name, native_options, app_creator)
}
}
}
// ----------------------------------------------------------------------------
/// The different problems that can occur when trying to run `eframe`.
#[derive(thiserror::Error, Debug)]
pub enum Error {
#[cfg(not(target_arch = "wasm32"))]
#[error("winit error: {0}")]
Winit(#[from] winit::error::OsError),
#[cfg(all(feature = "glow", not(target_arch = "wasm32")))]
#[error("glutin error: {0}")]
Glutin(#[from] glutin::error::Error),
#[cfg(all(feature = "glow", not(target_arch = "wasm32")))]
#[error("Found no glutin configs matching the template: {0:?}. error: {1:?}")]
NoGlutinConfigs(glutin::config::ConfigTemplate, Box<dyn std::error::Error>),
#[cfg(feature = "wgpu")]
#[error("WGPU error: {0}")]
Wgpu(#[from] egui_wgpu::WgpuError),
}
pub type Result<T> = std::result::Result<T, Error>;
// ---------------------------------------------------------------------------
#[cfg(not(target_arch = "wasm32"))]
#[cfg(any(feature = "glow", feature = "wgpu"))]
mod profiling_scopes {
/// Profiling macro for feature "puffin"
macro_rules! profile_function {
($($arg: tt)*) => {
#[cfg(feature = "puffin")]
puffin::profile_function!($($arg)*);
};
}
pub(crate) use profile_function;
/// Profiling macro for feature "puffin"
macro_rules! profile_scope {
($($arg: tt)*) => {
#[cfg(feature = "puffin")]
puffin::profile_scope!($($arg)*);
};
}
pub(crate) use profile_scope;
}
#[cfg(not(target_arch = "wasm32"))]
#[cfg(any(feature = "glow", feature = "wgpu"))]
pub(crate) use profiling_scopes::*;