perf: use tokio

not sure how much this helps practically

Cargo.lock

@@ -1429,6 +1429,7 @@ dependencies = [
  "rayon",
  "rfd",
  "size",
+ "tokio",
  "zip",
 ]
 
@@ -1745,6 +1746,7 @@ dependencies = [
  "iced_core",
  "log",
  "rustc-hash 2.1.3",
+ "tokio",
  "wasm-bindgen-futures",
  "wasmtimer",
 ]
@@ -4259,6 +4261,15 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
+[[package]]
+name = "tokio"
+version = "1.53.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "202caea871b69668250d242070849eb495be178ed697a3e98aebce5bc81a0bed"
+dependencies = [
+ "pin-project-lite",
+]
+
 [[package]]
 name = "toml"
 version = "1.1.4+spec-1.1.0"

Cargo.toml

@@ -10,11 +10,12 @@ kra-image-integration = "0.1.0"
 rayon = "1.12.0"
 rfd = "0.17.2"
 size = "0.5.0"
+tokio = "1.53.1"
 zip = "8.6.0"
 
 [dependencies.iced]
 version = "0.14.0"
-features = [ "image" ]
+features = [ "image", "tokio" ]
 
 [dependencies.image]
 version = "0.25.10"

src/app/mod.rs

@@ -75,9 +75,13 @@ impl State {
                     let size = 1000 / self.columns as u32;
                     let (task, handle) = Task::perform(
                         async move {
-                            utils::load_thumbnail(&path, size)
-                                .map(|img| (path, handle_from_image(img)))
-                                .map_err(Arc::new)
+                            tokio::task::spawn_blocking(move || {
+                                utils::load_thumbnail(&path, size)
+                                    .map(|img| (path, handle_from_image(img)))
+                                    .map_err(Arc::new)
+                            })
+                            .await
+                            .unwrap()
                         },
                         Message::ImageLoaded,
                     )
@@ -194,7 +198,7 @@ impl State {
                                 |handle| widget::image(handle).into(),
                             ))
                             .key(self.key)
-                            .anticipate(2000)
+                            .anticipate(500)
                             .on_show(|_size| Message::LoadImage(path.clone()))
                             .on_hide(Message::UnloadImage(path.clone())),
                         )