Added mime field to DroppedFiles (#3273)

Author: abey79

crates/eframe/src/web/events.rs

@@ -473,6 +473,7 @@ pub fn install_canvas_events(runner_ref: &WebRunner) -> Result<(), JsValue> {
                     for i in 0..files.length() {
                         if let Some(file) = files.get(i) {
                             let name = file.name();
+                            let mime = file.type_();
                             let last_modified = std::time::UNIX_EPOCH
                                 + std::time::Duration::from_millis(file.last_modified() as u64);
 
@@ -491,6 +492,7 @@ pub fn install_canvas_events(runner_ref: &WebRunner) -> Result<(), JsValue> {
                                             runner_lock.input.raw.dropped_files.push(
                                                 egui::DroppedFile {
                                                     name,
+                                                    mime,
                                                     last_modified: Some(last_modified),
                                                     bytes: Some(bytes.into()),
                                                     ..Default::default()

crates/egui/src/data/input.rs

@@ -155,6 +155,9 @@ pub struct DroppedFile {
     /// Name of the file. Set by the `eframe` web backend.
     pub name: String,
 
+    /// With the `eframe` web backend, this is set to the mime-type of the file (if available).
+    pub mime: String,
+
     /// Set by the `eframe` web backend.
     pub last_modified: Option<std::time::SystemTime>,
 

crates/egui_demo_app/src/wrap_app.rs

@@ -460,9 +460,18 @@ impl WrapApp {
                         } else {
                             "???".to_owned()
                         };
+
+                        let mut additional_info = vec![];
+                        if !file.mime.is_empty() {
+                            additional_info.push(format!("type: {}", file.mime));
+                        }
                         if let Some(bytes) = &file.bytes {
-                            write!(info, " ({} bytes)", bytes.len()).ok();
+                            additional_info.push(format!("{} bytes", bytes.len()));
                         }
+                        if !additional_info.is_empty() {
+                            info += &format!(" ({})", additional_info.join(", "));
+                        }
+
                         ui.label(info);
                     }
                 });

examples/file_dialog/src/main.rs

@@ -53,10 +53,18 @@ impl eframe::App for MyApp {
                         } else {
                             "???".to_owned()
                         };
+
+                        let mut additional_info = vec![];
+                        if !file.mime.is_empty() {
+                            additional_info.push(format!("type: {}", file.mime));
+                        }
                         if let Some(bytes) = &file.bytes {
-                            use std::fmt::Write as _;
-                            write!(info, " ({} bytes)", bytes.len()).ok();
+                            additional_info.push(format!("{} bytes", bytes.len()));
                         }
+                        if !additional_info.is_empty() {
+                            info += &format!(" ({})", additional_info.join(", "));
+                        }
+
                         ui.label(info);
                     }
                 });