feat: filter method cycling

it doesn't work :(

src/app/mod.rs

@@ -42,6 +42,8 @@ enum Message {
 struct State {
     images: BTreeMap<PathBuf, MaybeImage>,
 
+    filter: widget::image::FilterMethod,
+
     columns: usize,
 
     key: usize,
@@ -53,10 +55,8 @@ impl State {
     fn new() -> (Self, Task<Message>) {
         (
             Self {
-                images: BTreeMap::new(),
                 columns: 3,
-                key: 0,
+                ..Default::default()
-                error: None,
             },
             Task::done(Message::OpenPath(Some(
                 env::args()
@@ -178,6 +178,13 @@ impl State {
                     self.columns = (self.columns - 1).clamp(1, 10)
                 }
 
+                keyboard::Key::Character("f") => {
+                    self.filter = match self.filter {
+                        widget::image::FilterMethod::Linear => widget::image::FilterMethod::Nearest,
+                        widget::image::FilterMethod::Nearest => widget::image::FilterMethod::Linear,
+                    }
+                }
+
                 keyboard::Key::Character("q") => {
                     return window::latest().and_then(window::close);
                 }
@@ -195,7 +202,7 @@ impl State {
                         widget::container(
                             widget::sensor(maybe_image.handle().map_or_else(
                                 || Element::from(widget::space()),
-                                |handle| widget::image(handle).into(),
+                                |handle| widget::image(handle).filter_method(self.filter).into(),
                             ))
                             .key(self.key)
                             .anticipate(500)