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Store web_sys::File inside of DroppedFile (#8354)

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* Closes #4654
* Related #4667
* [x] I have followed the instructions in the PR template

This PR avoids materializing the contents of a file that was dragged
into an egui application on the web. It does so by storing the
`web_sys::File` handle directly on WASM.

This breaks the existing API of `DroppedFile` on the web, because there
is no way to retrieve the bytes synchronously form a `DroppedFile`
anymore, forcing handling call sites to become asynchronous.

The native API remains the same.

---------

Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
This commit is contained in:
Jochen Görtler
2026-08-03 17:07:37 +02:00
committed by GitHub
parent 2e7a92bc37
commit 49d4befe6b
13 changed files with 197 additions and 120 deletions
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11
crates/eframe/src/web/mod.rs
View File

@@ -5,6 +5,7 @@
mod app_runner;
mod backend;
mod dropped_file;
mod events;
mod input;
mod panic_handler;
@@ -207,13 +208,12 @@ fn set_clipboard_text(s: &str) {
return;
}
let promise = window.navigator().clipboard().write_text(s);
let future = wasm_bindgen_futures::JsFuture::from(promise);
let future = async move {
if let Err(err) = future.await {
if let Err(err) = promise.await {
log::error!("Copy/cut action failed: {}", string_from_js_value(&err));
}
};
wasm_bindgen_futures::spawn_local(future);
js_sys::futures::spawn_local(future);
}
}
@@ -248,16 +248,15 @@ fn set_clipboard_image(image: &egui::ColorImage) {
};
let items = js_sys::Array::of1(&item);
let promise = window.navigator().clipboard().write(&items);
let future = wasm_bindgen_futures::JsFuture::from(promise);
let future = async move {
if let Err(err) = future.await {
if let Err(err) = promise.await {
log::error!(
"Copy/cut image action failed: {}",
string_from_js_value(&err)
);
}
};
wasm_bindgen_futures::spawn_local(future);
js_sys::futures::spawn_local(future);
}
}