diff --git a/src/main.rs b/src/main.rs
index 9c071b9..e890b3e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -10,24 +10,20 @@ const LINE_ENDING: &str = "\r\n";
 #[cfg(not(windows))]
 const LINE_ENDING: &str = "\n";
 
-#[derive(Resource)]
-struct InputText {
-    value: String,
-}
-
-#[derive(Resource)]
-struct OutputText {
-    value: String,
+#[derive(Resource, Debug)]
+struct State {
+    input_value: String,
+    output_value: String,
+    needs_update: bool,
 }
 
 fn main() {
     App::new()
         .insert_resource(WinitSettings::desktop_app())
-        .insert_resource(InputText {
-            value: "".to_string(),
-        })
-        .insert_resource(OutputText {
-            value: "".to_string(),
+        .insert_resource(State {
+            input_value: "".to_string(),
+            output_value: "".to_string(),
+            needs_update: false,
         })
         .add_plugins(DefaultPlugins)
         .add_plugins(EguiPlugin)
@@ -37,46 +33,51 @@ fn main() {
         .run();
 }
 
+// TODO: move this into init
 fn set_window_title(mut window_query: Query<&mut Window, With<PrimaryWindow>>) {
     if let Ok(mut window) = window_query.get_single_mut() {
         window.title = "dsort".to_string();
     }
 }
 
-fn process_text(input_text: Res<InputText>, mut output_text: ResMut<OutputText>) {
-    let mut arr = input_text.value.lines().collect::<Vec<_>>();
-    arr.sort_by(|&a, &b| vsort::compare(a, b));
-    output_text.value = arr.join(LINE_ENDING);
+fn process_text(mut state: ResMut<State>) {
+    if state.needs_update {
+        println!("updating sort");
+        let mut arr = state.input_value.lines().collect::<Vec<_>>();
+        arr.sort_by(|&a, &b| vsort::compare(a, b));
+        state.output_value = arr.join(LINE_ENDING);
+        state.needs_update = false;
+    }
 }
 
-fn ui_system(
-    mut contexts: EguiContexts,
-    mut input_text: ResMut<InputText>,
-    mut output_text: ResMut<OutputText>,
-) {
+fn ui_system(mut contexts: EguiContexts, mut state: ResMut<State>) {
     contexts.ctx_mut().set_visuals(egui::Visuals::light());
+
     egui::CentralPanel::default().show(contexts.ctx_mut(), |ui| {
         let window_size = ui.available_size();
         let height = window_size[1];
+
         ui.with_layout(
             egui::Layout::left_to_right(egui::Align::Center).with_cross_justify(true),
             |ui| {
                 egui::ScrollArea::vertical()
                     .id_source("left")
                     .show(ui, |ui| {
-                        ui.add_sized(
+                        let response = ui.add_sized(
                             [ui.available_width() / 2., height],
-                            egui::TextEdit::multiline(&mut input_text.value),
+                            egui::TextEdit::multiline(&mut state.input_value),
                         );
+                        if response.changed() {
+                            state.needs_update = true;
+                        }
                     });
 
                 egui::ScrollArea::vertical()
                     .id_source("right")
                     .show(ui, |ui| {
-                        ui.add_sized(
-                            [ui.available_width(), height],
-                            egui::TextEdit::multiline(&mut output_text.value),
-                        );
+                        ui.with_layout(egui::Layout::top_down_justified(egui::Align::LEFT), |ui| {
+                            ui.add(egui::Label::new(&state.output_value).selectable(true));
+                        })
                     });
             },
         );