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eframe web: detect and report panics during startup (#2992)

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* Detect panics during initialization and show them to the user

* PanicHandler now also logs the panics

* Add example of how to call into your app from JS

* Refactor: break out AppRunner and AppRunnerRef to own files

* Hide AppRunner

* Simplify user code

* AppRunnerRef -> WebRunner

* Better docs

* Don't paint until first animation frame

* Update multiple_apps.html

* Update web demo

* Cleanup and fixes

* left-align panic message in html
This commit is contained in:
Emil Ernerfeldt
2023-05-16 22:22:09 +02:00
committed by GitHub
parent ff8e4826b3
commit ea71b7f20b
15 changed files with 791 additions and 716 deletions
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26
docs/index.html
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@@ -91,7 +91,6 @@
transform: rotate(360deg);
}
}
</style>
</head>
@@ -133,17 +132,7 @@
function on_wasm_loaded() {
console.debug("Wasm loaded. Starting app…");
// This call installs a bunch of callbacks and then returns:
let handle = new wasm_bindgen.WebHandle("the_canvas_id");
handle.then(on_app_started).catch(on_error);
}
function on_app_started(handle) {
// Call `handle.destroy()` to stop. Uncomment to quick result:
// setTimeout(() => { handle.destroy(); handle.free()) }, 2000)
console.debug("App started.");
document.getElementById("center_text").innerHTML = '';
let handle = new wasm_bindgen.WebHandle();
function check_for_panic() {
if (handle.has_panicked()) {
@@ -159,6 +148,9 @@
<p>
The egui app has crashed.
</p>
<p style="font-size:10px" align="left">
${handle.panic_message()}
</p>
<p style="font-size:14px">
See the console for details.
</p>
@@ -172,6 +164,16 @@
}
check_for_panic();
handle.start("the_canvas_id").then(on_app_started).catch(on_error);
}
function on_app_started(handle) {
// Call `handle.destroy()` to stop. Uncomment to quick result:
// setTimeout(() => { handle.destroy(); handle.free()) }, 2000)
console.debug("App started.");
document.getElementById("center_text").innerHTML = '';
}
function on_error(error) {