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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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36
examples/file_dialog/src/main.rs
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@@ -20,7 +20,7 @@ fn main() -> eframe::Result {
#[derive(Default)]
struct MyApp {
dropped_files: Vec<egui::DroppedFile>,
dropped_files: Vec<egui::DroppedFileHandle>,
picked_path: Option<String>,
}
@@ -48,27 +48,23 @@ impl eframe::App for MyApp {
ui.label("Dropped files:");
for file in &self.dropped_files {
let mut info = if let Some(path) = &file.path {
path.display().to_string()
} else if file.name.is_empty() {
"???".to_owned()
} else {
file.name.clone()
};
#[cfg(not(target_arch = "wasm32"))]
ui.label(file.path().display().to_string());
let mut additional_info = vec![];
if !file.mime.is_empty() {
additional_info.push(format!("type: {}", file.mime));
#[cfg(target_arch = "wasm32")]
{
let Some(web_file) = file.web_file() else {
continue;
};
let name = web_file.name();
let mime = web_file.type_();
let size = web_file.size();
if mime.is_empty() {
ui.label(format!("{name} ({size} bytes)"));
} else {
ui.label(format!("{name} (type: {mime}, {size} bytes)"));
}
}
if let Some(bytes) = &file.bytes {
additional_info.push(format!("{} bytes", bytes.len()));
}
if !additional_info.is_empty() {
use std::fmt::Write as _;
write!(info, " ({})", additional_info.join(", ")).ok();
}
ui.label(info);
}
});
}