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docs and example

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Stanislav 2022-07-30 20:11:46 +03:00
parent d0bcdfc226
commit 6e0140104d
4 changed files with 242 additions and 18 deletions
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6
docs/index.html
View file

@ -133,7 +133,11 @@
console.debug("wasm loaded. starting app…");
// This call installs a bunch of callbacks and then returns:
wasm_bindgen.start("the_canvas_id");
const handle = wasm_bindgen.start("the_canvas_id");
// call `handle.stop_web()` to stop
// uncomment to quick result
// setTimeout(() => {handle.stop_web(); handle.free())}, 2000)
console.debug("app started.");
document.getElementById("center_text").remove();

200
docs/multiple_apps.html Normal file
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@ -0,0 +1,200 @@
<!DOCTYPE html>
<html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<!-- Disable zooming: -->
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
<head>
<title>egui – An immediate mode GUI written in Rust</title>
<style>
html {
/* Remove touch delay: */
touch-action: manipulation;
}
body {
/* Light mode background color for what is not covered by the egui canvas,
or where the egui canvas is translucent. */
background: #909090;
display:flex;
}
.canvas_wrap{
/* height: 200px; */
width: 400px;
}
@media (prefers-color-scheme: dark) {
body {
/* Dark mode background color for what is not covered by the egui canvas,
or where the egui canvas is translucent. */
background: #404040;
}
}
/* Allow canvas to fill entire web page: */
html,
body {
overflow: hidden;
margin: 0 !important;
padding: 0 !important;
height: 100%;
width: 100%;
}
/* Position canvas in center-top: */
canvas {
/* margin-right: auto;
margin-left: auto; */
/* display: block;
position: absolute;
top: 0%;
left: 50%;
transform: translate(-50%, 0%); */
width:90%;
height:90%;
}
.centered {
margin-right: auto;
margin-left: auto;
display: block;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
color: #f0f0f0;
font-size: 24px;
font-family: Ubuntu-Light, Helvetica, sans-serif;
text-align: center;
}
/* ---------------------------------------------- */
/* Loading animation from https://loading.io/css/ */
.lds-dual-ring {
display: inline-block;
width: 24px;
height: 24px;
}
.lds-dual-ring:after {
content: " ";
display: block;
width: 24px;
height: 24px;
margin: 0px;
border-radius: 50%;
border: 3px solid #fff;
border-color: #fff transparent #fff transparent;
animation: lds-dual-ring 1.2s linear infinite;
}
@keyframes lds-dual-ring {
0% {
transform: rotate(0deg);
}
100% {
transform: rotate(360deg);
}
}
</style>
</head>
<body>
<!-- The WASM code will resize the canvas dynamically -->
<div>controls</div>
<button class="stop_one">
stop
</button>
<div class="canvas_wrap one">
<canvas id="the_canvas_id_one"></canvas>
</div>
<div class="canvas_wrap two">
<canvas id="the_canvas_id_two"></canvas>
</div>
<div class="centered" id="center_text">
<p style="font-size:16px">
Loading…
</p>
<div class="lds-dual-ring"></div>
</div>
<script>
// The `--no-modules`-generated JS from `wasm-bindgen` attempts to use
// `WebAssembly.instantiateStreaming` to instantiate the wasm module,
// but this doesn't work with `file://` urls. This example is frequently
// viewed by simply opening `index.html` in a browser (with a `file://`
// url), so it would fail if we were to call this function!
//
// Work around this for now by deleting the function to ensure that the
// `no_modules.js` script doesn't have access to it. You won't need this
// hack when deploying over HTTP.
delete WebAssembly.instantiateStreaming;
</script>
<!-- this is the JS generated by the `wasm-bindgen` CLI tool -->
<script src="egui_demo_app.js"></script>
<script>
// We'll defer our execution until the wasm is ready to go.
// Here we tell bindgen the path to the wasm file so it can start
// initialization and return to us a promise when it's done.
console.debug("loading wasm…");
wasm_bindgen("./egui_demo_app_bg.wasm")
.then(on_wasm_loaded)
.catch(on_wasm_error);
function on_wasm_loaded() {
console.debug("wasm loaded. starting app…");
// This call installs a bunch of callbacks and then returns:
wasm_bindgen.init_wasm_hooks()
const handle_one = wasm_bindgen.start_separate("the_canvas_id_one");
const handle_two = wasm_bindgen.start_separate("the_canvas_id_two");
const button = document.getElementsByClassName("stop_one")[0]
button.addEventListener("click", ()=>{
handle_one.stop_web()
handle_one.free()
});
// call `handle.stop_web()` to stop
// uncomment to quick result
// setTimeout(() => {handle.stop_web()}, 2000)
console.debug("app started.");
document.getElementById("center_text").remove();
}
function on_wasm_error(error) {
console.error("Failed to start: " + error);
document.getElementById("center_text").innerHTML = `
<p>
An error occurred during loading:
</p>
<p style="font-family:Courier New">
${error}
</p>
<p style="font-size:14px">
Make sure you use a modern browser with WebGL and WASM enabled.
</p>`;
}
</script>
</body>
</html>
<!-- Powered by egui: https://github.com/emilk/egui/ -->

2
eframe/CHANGELOG.md
View file

@ -28,6 +28,8 @@ NOTE: [`egui-winit`](../egui-winit/CHANGELOG.md), [`egui_glium`](../egui_glium/C
#### Web:
* Added option to select WebGL version ([#1803](https://github.com/emilk/egui/pull/1803)).
* Added ability to stop/re-run web app from JavaScript ([#1803](https://github.com/emilk/egui/pull/1650)). This change is also finds parent html container and resizes canvas to it's size. So settings `html, body: [height: 100%; width: 100%;]` for older demos is required.
## 0.18.0 - 2022-04-30

52
egui_demo_app/src/lib.rs
View file

@ -40,16 +40,46 @@ impl WebHandle {
#[wasm_bindgen]
#[cfg(target_arch = "wasm32")]
pub fn stop_web(&self) -> Result<(), wasm_bindgen::JsValue> {
let res = self.handle.lock().destroy();
let mut app = self.handle.lock();
let res = app.destroy();
// let numw = Arc::weak_count(&uu);
// let nums = Arc::strong_count(&uu);
// 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.
@ -57,19 +87,7 @@ impl WebHandle {
#[cfg(target_arch = "wasm32")]
#[wasm_bindgen]
pub fn start(canvas_id: &str) -> Result<WebHandle, wasm_bindgen::JsValue> {
// 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();
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
init_wasm_hooks();
start_separate(canvas_id)
}