Reverse renderer/ui relationship

src/core/musichoard/musichoard.rs

@@ -716,25 +716,29 @@ mod tests {
         let mut expected = FULL_COLLECTION.to_owned();
         expected.sort_unstable();
 
-        let mut mh = MusicHoard::default();
+        let mut mh = MusicHoard {
-        mh.library_cache = left
+            collection: right.clone(),
+            library_cache: left
                 .clone()
                 .into_iter()
                 .map(|a| (a.id.clone(), a))
-            .collect();
+                .collect(),
-        mh.collection = right.clone();
+            ..Default::default()
+        };
 
         mh.merge_collections();
         assert_eq!(expected, mh.collection);
 
         // The merge is completely non-overlapping so it should be commutative.
-        let mut mh = MusicHoard::default();
+        let mut mh = MusicHoard {
-        mh.library_cache = right
+            collection: left.clone(),
+            library_cache: right
                 .clone()
                 .into_iter()
                 .map(|a| (a.id.clone(), a))
-            .collect();
+                .collect(),
-        mh.collection = left.clone();
+            ..Default::default()
+        };
 
         mh.merge_collections();
         assert_eq!(expected, mh.collection);
@@ -750,25 +754,29 @@ mod tests {
         let mut expected = FULL_COLLECTION.to_owned();
         expected.sort_unstable();
 
-        let mut mh = MusicHoard::default();
+        let mut mh = MusicHoard {
-        mh.library_cache = left
+            collection: right.clone(),
+            library_cache: left
                 .clone()
                 .into_iter()
                 .map(|a| (a.id.clone(), a))
-            .collect();
+                .collect(),
-        mh.collection = right.clone();
+            ..Default::default()
+        };
 
         mh.merge_collections();
         assert_eq!(expected, mh.collection);
 
         // The merge does not overwrite any data so it should be commutative.
-        let mut mh = MusicHoard::default();
+        let mut mh = MusicHoard {
-        mh.library_cache = right
+            collection: left.clone(),
+            library_cache: right
                 .clone()
                 .into_iter()
                 .map(|a| (a.id.clone(), a))
-            .collect();
+                .collect(),
-        mh.collection = left.clone();
+            ..Default::default()
+        };
 
         mh.merge_collections();
         assert_eq!(expected, mh.collection);
@@ -797,25 +805,29 @@ mod tests {
         expected.last_mut().as_mut().unwrap().sort = artist_sort.clone();
         expected.rotate_right(1);
 
-        let mut mh = MusicHoard::default();
+        let mut mh = MusicHoard {
-        mh.library_cache = left
+            collection: right.clone(),
+            library_cache: left
                 .clone()
                 .into_iter()
                 .map(|a| (a.id.clone(), a))
-            .collect();
+                .collect(),
-        mh.collection = right.clone();
+            ..Default::default()
+        };
 
         mh.merge_collections();
         assert_eq!(expected, mh.collection);
 
         // The merge overwrites the sort data, but no data is erased so it should be commutative.
-        let mut mh = MusicHoard::default();
+        let mut mh = MusicHoard {
-        mh.library_cache = right
+            collection: left.clone(),
+            library_cache: right
                 .clone()
                 .into_iter()
                 .map(|a| (a.id.clone(), a))
-            .collect();
+                .collect(),
-        mh.collection = left.clone();
+            ..Default::default()
+        };
 
         mh.merge_collections();
         assert_eq!(expected, mh.collection);

src/main.rs

@@ -20,13 +20,7 @@ use musichoard::{
     MusicHoardBuilder, NoDatabase, NoLibrary,
 };
 
-use tui::{
+use tui::{App, EventChannel, EventHandler, EventListener, Tui, Ui};
-    event::EventChannel,
-    handler::EventHandler,
-    listener::EventListener,
-    ui::{render::Renderer, Ui},
-    Tui,
-};
 
 #[derive(StructOpt)]
 struct Opt {
@@ -73,11 +67,11 @@ fn with<LIB: ILibrary, DB: IDatabase>(builder: MusicHoardBuilder<LIB, DB>) {
     let listener = EventListener::new(channel.sender());
     let handler = EventHandler::new(channel.receiver());
 
-    let ui = Ui::new(music_hoard).expect("failed to initialise ui");
+    let app = App::new(music_hoard).expect("failed to initialise application");
-    let renderer = Renderer;
+    let ui = Ui;
 
     // Run the TUI application.
-    Tui::run(terminal, ui, renderer, handler, listener).expect("failed to run tui");
+    Tui::run(terminal, app, ui, handler, listener).expect("failed to run tui");
 }
 
 fn with_database<LIB: ILibrary>(db_opt: DbOpt, builder: MusicHoardBuilder<LIB, NoDatabase>) {

src/tui/app.rs

@@ -1,21 +1,16 @@
-pub mod render;
-
 use std::fmt;
 
 use musichoard::collection::{album::Album, artist::Artist, track::Track, Collection};
-use ratatui::{backend::Backend, widgets::ListState, Frame};
+use ratatui::widgets::ListState;
 
-use crate::tui::{
+use crate::tui::{lib::IMusicHoard, Error};
-    ui::render::IRender,
-    {lib::IMusicHoard, Error},
-};
 
 #[derive(Debug)]
-pub enum UiError {
+pub enum AppError {
     Lib(String),
 }
 
-impl fmt::Display for UiError {
+impl fmt::Display for AppError {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match *self {
             Self::Lib(ref s) => write!(f, "the musichoard library returned an error: {s}"),
@@ -23,54 +18,52 @@ impl fmt::Display for UiError {
     }
 }
 
-impl From<musichoard::Error> for UiError {
+impl From<musichoard::Error> for AppError {
-    fn from(err: musichoard::Error) -> UiError {
+    fn from(err: musichoard::Error) -> AppError {
-        UiError::Lib(err.to_string())
+        AppError::Lib(err.to_string())
     }
 }
 
-pub enum UiState<BS, IS, RS, ES> {
+pub enum AppState<BS, IS, RS, ES> {
     Browse(BS),
     Info(IS),
     Reload(RS),
     Error(ES),
 }
 
-impl<BS, IS, RS, ES> UiState<BS, IS, RS, ES> {
+impl<BS, IS, RS, ES> AppState<BS, IS, RS, ES> {
     fn is_browse(&self) -> bool {
-        matches!(self, UiState::Browse(_))
+        matches!(self, AppState::Browse(_))
     }
 
     fn is_info(&self) -> bool {
-        matches!(self, UiState::Info(_))
+        matches!(self, AppState::Info(_))
     }
 
     fn is_reload(&self) -> bool {
-        matches!(self, UiState::Reload(_))
+        matches!(self, AppState::Reload(_))
     }
 
     fn is_error(&self) -> bool {
-        matches!(self, UiState::Error(_))
+        matches!(self, AppState::Error(_))
     }
 }
 
-pub trait IUi {
+pub trait IAppInteract {
-    type BS: IUiBrowse;
+    type BS: IAppInteractBrowse;
-    type IS: IUiInfo;
+    type IS: IAppInteractInfo;
-    type RS: IUiReload;
+    type RS: IAppInteractReload;
-    type ES: IUiError;
+    type ES: IAppInteractError;
 
     fn is_running(&self) -> bool;
     fn quit(&mut self);
 
-    fn save(&mut self) -> Result<(), UiError>;
+    fn save(&mut self) -> Result<(), AppError>;
 
-    fn state(&mut self) -> UiState<&mut Self::BS, &mut Self::IS, &mut Self::RS, &mut Self::ES>;
+    fn state(&mut self) -> AppState<&mut Self::BS, &mut Self::IS, &mut Self::RS, &mut Self::ES>;
-
-    fn render<R: IRender, B: Backend>(&mut self, renderer: &R, frame: &mut Frame<'_, B>);
 }
 
-pub trait IUiBrowse {
+pub trait IAppInteractBrowse {
     fn increment_category(&mut self);
     fn decrement_category(&mut self);
     fn increment_selection(&mut self);
@@ -81,109 +74,46 @@ pub trait IUiBrowse {
     fn show_reload_menu(&mut self);
 }
 
-pub trait IUiInfo {
+pub trait IAppInteractInfo {
     fn hide_info_overlay(&mut self);
 }
 
-pub trait IUiReload {
+pub trait IAppInteractReload {
     fn reload_library(&mut self);
     fn reload_database(&mut self);
     fn go_back(&mut self);
 }
 
-pub trait IUiError {
+pub trait IAppInteractError {
     fn dismiss_error(&mut self);
 }
 
-struct TrackSelection {
+// It would be preferable to have a getter for each field separately. However, the selection field
-    state: ListState,
+// needs to be mutably accessible requiring a mutable borrow of the entire struct if behind a trait.
+// This in turn complicates simultaneous field access since only a single mutable borrow is allowed.
+// Therefore, all fields are grouped into a single struct and returned as a batch.
+pub trait IAppAccess {
+    fn get(&mut self) -> AppPublic;
 }
 
-struct AlbumSelection {
+pub struct AppPublic<'app> {
-    state: ListState,
+    pub collection: &'app Collection,
-    track: TrackSelection,
+    pub selection: &'app mut Selection,
+    pub state: &'app AppState<(), (), (), String>,
 }
 
-struct ArtistSelection {
+pub struct ArtistSelection {
-    state: ListState,
+    pub state: ListState,
-    album: AlbumSelection,
+    pub album: AlbumSelection,
 }
 
-impl TrackSelection {
+pub struct AlbumSelection {
-    fn initialise(tracks: Option<&[Track]>) -> Self {
+    pub state: ListState,
-        let mut state = ListState::default();
+    pub track: TrackSelection,
-        if let Some(tracks) = tracks {
-            state.select(if !tracks.is_empty() { Some(0) } else { None });
-        } else {
-            state.select(None);
-        };
-        TrackSelection { state }
 }
 
-    fn increment(&mut self, tracks: &[Track]) {
+pub struct TrackSelection {
-        if let Some(index) = self.state.selected() {
+    pub state: ListState,
-            if let Some(result) = index.checked_add(1) {
-                if result < tracks.len() {
-                    self.state.select(Some(result));
-                }
-            }
-        }
-    }
-
-    fn decrement(&mut self, _tracks: &[Track]) {
-        if let Some(index) = self.state.selected() {
-            if let Some(result) = index.checked_sub(1) {
-                self.state.select(Some(result));
-            }
-        }
-    }
-}
-
-impl AlbumSelection {
-    fn initialise(albums: Option<&[Album]>) -> Self {
-        let mut state = ListState::default();
-        let track: TrackSelection;
-        if let Some(albums) = albums {
-            state.select(if !albums.is_empty() { Some(0) } else { None });
-            track = TrackSelection::initialise(albums.first().map(|a| a.tracks.as_slice()));
-        } else {
-            state.select(None);
-            track = TrackSelection::initialise(None);
-        }
-        AlbumSelection { state, track }
-    }
-
-    fn increment(&mut self, albums: &[Album]) {
-        if let Some(index) = self.state.selected() {
-            if let Some(result) = index.checked_add(1) {
-                if result < albums.len() {
-                    self.state.select(Some(result));
-                    self.track = TrackSelection::initialise(Some(&albums[result].tracks));
-                }
-            }
-        }
-    }
-
-    fn increment_track(&mut self, albums: &[Album]) {
-        if let Some(index) = self.state.selected() {
-            self.track.increment(&albums[index].tracks);
-        }
-    }
-
-    fn decrement(&mut self, albums: &[Album]) {
-        if let Some(index) = self.state.selected() {
-            if let Some(result) = index.checked_sub(1) {
-                self.state.select(Some(result));
-                self.track = TrackSelection::initialise(Some(&albums[result].tracks));
-            }
-        }
-    }
-
-    fn decrement_track(&mut self, albums: &[Album]) {
-        if let Some(index) = self.state.selected() {
-            self.track.decrement(&albums[index].tracks);
-        }
-    }
 }
 
 impl ArtistSelection {
@@ -245,6 +175,83 @@ impl ArtistSelection {
     }
 }
 
+impl AlbumSelection {
+    fn initialise(albums: Option<&[Album]>) -> Self {
+        let mut state = ListState::default();
+        let track: TrackSelection;
+        if let Some(albums) = albums {
+            state.select(if !albums.is_empty() { Some(0) } else { None });
+            track = TrackSelection::initialise(albums.first().map(|a| a.tracks.as_slice()));
+        } else {
+            state.select(None);
+            track = TrackSelection::initialise(None);
+        }
+        AlbumSelection { state, track }
+    }
+
+    fn increment(&mut self, albums: &[Album]) {
+        if let Some(index) = self.state.selected() {
+            if let Some(result) = index.checked_add(1) {
+                if result < albums.len() {
+                    self.state.select(Some(result));
+                    self.track = TrackSelection::initialise(Some(&albums[result].tracks));
+                }
+            }
+        }
+    }
+
+    fn increment_track(&mut self, albums: &[Album]) {
+        if let Some(index) = self.state.selected() {
+            self.track.increment(&albums[index].tracks);
+        }
+    }
+
+    fn decrement(&mut self, albums: &[Album]) {
+        if let Some(index) = self.state.selected() {
+            if let Some(result) = index.checked_sub(1) {
+                self.state.select(Some(result));
+                self.track = TrackSelection::initialise(Some(&albums[result].tracks));
+            }
+        }
+    }
+
+    fn decrement_track(&mut self, albums: &[Album]) {
+        if let Some(index) = self.state.selected() {
+            self.track.decrement(&albums[index].tracks);
+        }
+    }
+}
+
+impl TrackSelection {
+    fn initialise(tracks: Option<&[Track]>) -> Self {
+        let mut state = ListState::default();
+        if let Some(tracks) = tracks {
+            state.select(if !tracks.is_empty() { Some(0) } else { None });
+        } else {
+            state.select(None);
+        };
+        TrackSelection { state }
+    }
+
+    fn increment(&mut self, tracks: &[Track]) {
+        if let Some(index) = self.state.selected() {
+            if let Some(result) = index.checked_add(1) {
+                if result < tracks.len() {
+                    self.state.select(Some(result));
+                }
+            }
+        }
+    }
+
+    fn decrement(&mut self, _tracks: &[Track]) {
+        if let Some(index) = self.state.selected() {
+            if let Some(result) = index.checked_sub(1) {
+                self.state.select(Some(result));
+            }
+        }
+    }
+}
+
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
 pub enum Category {
     Artist,
@@ -253,19 +260,19 @@ pub enum Category {
 }
 
 pub struct Selection {
-    active: Category,
+    pub active: Category,
-    artist: ArtistSelection,
+    pub artist: ArtistSelection,
 }
 
 impl Selection {
-    fn new(artists: Option<&[Artist]>) -> Self {
+    pub fn new(artists: Option<&[Artist]>) -> Self {
         Selection {
             active: Category::Artist,
             artist: ArtistSelection::initialise(artists),
         }
     }
 
-    fn increment_category(&mut self) {
+    pub fn increment_category(&mut self) {
         self.active = match self.active {
             Category::Artist => Category::Album,
             Category::Album => Category::Track,
@@ -273,7 +280,7 @@ impl Selection {
         };
     }
 
-    fn decrement_category(&mut self) {
+    pub fn decrement_category(&mut self) {
         self.active = match self.active {
             Category::Artist => Category::Artist,
             Category::Album => Category::Artist,
@@ -281,7 +288,7 @@ impl Selection {
         };
     }
 
-    fn increment_selection(&mut self, collection: &Collection) {
+    pub fn increment_selection(&mut self, collection: &Collection) {
         match self.active {
             Category::Artist => self.increment_artist(collection),
             Category::Album => self.increment_album(collection),
@@ -289,7 +296,7 @@ impl Selection {
         }
     }
 
-    fn decrement_selection(&mut self, collection: &Collection) {
+    pub fn decrement_selection(&mut self, collection: &Collection) {
         match self.active {
             Category::Artist => self.decrement_artist(collection),
             Category::Album => self.decrement_album(collection),
@@ -322,29 +329,29 @@ impl Selection {
     }
 }
 
-pub struct Ui<MH: IMusicHoard> {
+pub struct App<MH: IMusicHoard> {
     running: bool,
     music_hoard: MH,
     selection: Selection,
-    state: UiState<(), (), (), String>,
+    state: AppState<(), (), (), String>,
 }
 
-impl<MH: IMusicHoard> Ui<MH> {
+impl<MH: IMusicHoard> App<MH> {
     pub fn new(mut music_hoard: MH) -> Result<Self, Error> {
         // FIXME: if either returns an error start in an error state
         music_hoard.load_from_database()?;
         music_hoard.rescan_library()?;
         let selection = Selection::new(Some(music_hoard.get_collection()));
-        Ok(Ui {
+        Ok(App {
             running: true,
             music_hoard,
             selection,
-            state: UiState::Browse(()),
+            state: AppState::Browse(()),
         })
     }
 }
 
-impl<MH: IMusicHoard> IUi for Ui<MH> {
+impl<MH: IMusicHoard> IAppInteract for App<MH> {
     type BS = Self;
     type IS = Self;
     type RS = Self;
@@ -358,37 +365,21 @@ impl<MH: IMusicHoard> IUi for Ui<MH> {
         self.running = false;
     }
 
-    fn save(&mut self) -> Result<(), UiError> {
+    fn save(&mut self) -> Result<(), AppError> {
         Ok(self.music_hoard.save_to_database()?)
     }
 
-    fn state(&mut self) -> UiState<&mut Self::BS, &mut Self::IS, &mut Self::RS, &mut Self::ES> {
+    fn state(&mut self) -> AppState<&mut Self::BS, &mut Self::IS, &mut Self::RS, &mut Self::ES> {
         match self.state {
-            UiState::Browse(_) => UiState::Browse(self),
+            AppState::Browse(_) => AppState::Browse(self),
-            UiState::Info(_) => UiState::Info(self),
+            AppState::Info(_) => AppState::Info(self),
-            UiState::Reload(_) => UiState::Reload(self),
+            AppState::Reload(_) => AppState::Reload(self),
-            UiState::Error(_) => UiState::Error(self),
+            AppState::Error(_) => AppState::Error(self),
-        }
-    }
-
-    // FIXME: rendering logic should be in render.rs - reverse Renderer/Ui relationship so that TUI
-    // calls are renderer.render(ui, frame); Then rename ui -> app and render -> ui as it used to be
-    // originally.
-    fn render<R: IRender, B: Backend>(&mut self, _: &R, frame: &mut Frame<'_, B>) {
-        let collection: &Collection = &self.music_hoard.get_collection();
-        let selection: &mut Selection = &mut self.selection;
-
-        R::render_collection(collection, selection, frame);
-        match self.state {
-            UiState::Info(_) => R::render_info_overlay(collection, selection, frame),
-            UiState::Reload(_) => R::render_reload_overlay(frame),
-            UiState::Error(ref msg) => R::render_error_overlay(msg, frame),
-            _ => {}
         }
     }
 }
 
-impl<MH: IMusicHoard> IUiBrowse for Ui<MH> {
+impl<MH: IMusicHoard> IAppInteractBrowse for App<MH> {
     fn increment_category(&mut self) {
         self.selection.increment_category();
     }
@@ -409,23 +400,23 @@ impl<MH: IMusicHoard> IUiBrowse for Ui<MH> {
 
     fn show_info_overlay(&mut self) {
         assert!(self.state.is_browse());
-        self.state = UiState::Info(());
+        self.state = AppState::Info(());
     }
 
     fn show_reload_menu(&mut self) {
         assert!(self.state.is_browse());
-        self.state = UiState::Reload(());
+        self.state = AppState::Reload(());
     }
 }
 
-impl<MH: IMusicHoard> IUiInfo for Ui<MH> {
+impl<MH: IMusicHoard> IAppInteractInfo for App<MH> {
     fn hide_info_overlay(&mut self) {
         assert!(self.state.is_info());
-        self.state = UiState::Browse(());
+        self.state = AppState::Browse(());
     }
 }
 
-impl<MH: IMusicHoard> IUiReload for Ui<MH> {
+impl<MH: IMusicHoard> IAppInteractReload for App<MH> {
     fn reload_library(&mut self) {
         let result = self.music_hoard.rescan_library();
         self.refresh(result);
@@ -438,44 +429,51 @@ impl<MH: IMusicHoard> IUiReload for Ui<MH> {
 
     fn go_back(&mut self) {
         assert!(self.state.is_reload());
-        self.state = UiState::Browse(());
+        self.state = AppState::Browse(());
     }
 }
 
-trait IUiReloadPrivate {
+trait IAppInteractReloadPrivate {
     fn refresh(&mut self, result: Result<(), musichoard::Error>);
 }
 
-impl<MH: IMusicHoard> IUiReloadPrivate for Ui<MH> {
+impl<MH: IMusicHoard> IAppInteractReloadPrivate for App<MH> {
     fn refresh(&mut self, result: Result<(), musichoard::Error>) {
         assert!(self.state.is_reload());
         match result {
             Ok(()) => {
                 self.selection = Selection::new(Some(self.music_hoard.get_collection()));
-                self.state = UiState::Browse(())
+                self.state = AppState::Browse(())
             }
-            Err(err) => self.state = UiState::Error(err.to_string()),
+            Err(err) => self.state = AppState::Error(err.to_string()),
         }
     }
 }
 
-impl<MH: IMusicHoard> IUiError for Ui<MH> {
+impl<MH: IMusicHoard> IAppInteractError for App<MH> {
     fn dismiss_error(&mut self) {
         assert!(self.state.is_error());
-        self.state = UiState::Browse(());
+        self.state = AppState::Browse(());
+    }
+}
+
+impl<MH: IMusicHoard> IAppAccess for App<MH> {
+    fn get(&mut self) -> AppPublic {
+        AppPublic {
+            collection: self.music_hoard.get_collection(),
+            selection: &mut self.selection,
+            state: &self.state,
+        }
     }
 }
 
 #[cfg(test)]
 mod tests {
-    use crate::tui::lib::MockIMusicHoard;
+    use crate::tui::{lib::MockIMusicHoard, testmod::COLLECTION};
-    use crate::tui::testmod::COLLECTION;
-    use crate::tui::tests::{terminal, ui};
-    use crate::tui::ui::render::Renderer;
 
     use super::*;
 
-    pub fn music_hoard(collection: Collection) -> MockIMusicHoard {
+    fn music_hoard(collection: Collection) -> MockIMusicHoard {
         let mut music_hoard = MockIMusicHoard::new();
 
         music_hoard
@@ -645,11 +643,11 @@ mod tests {
 
     #[test]
     fn running() {
-        let mut ui = Ui::new(music_hoard(COLLECTION.to_owned())).unwrap();
+        let mut app = App::new(music_hoard(COLLECTION.to_owned())).unwrap();
-        assert!(ui.is_running());
+        assert!(app.is_running());
 
-        ui.quit();
+        app.quit();
-        assert!(!ui.is_running());
+        assert!(!app.is_running());
     }
 
     #[test]
@@ -661,99 +659,99 @@ mod tests {
             .times(1)
             .return_once(|| Ok(()));
 
-        let mut ui = Ui::new(music_hoard).unwrap();
+        let mut app = App::new(music_hoard).unwrap();
 
-        let result = ui.save();
+        let result = app.save();
         assert!(result.is_ok());
     }
 
     #[test]
     fn modifiers() {
-        let mut ui = Ui::new(music_hoard(COLLECTION.to_owned())).unwrap();
+        let mut app = App::new(music_hoard(COLLECTION.to_owned())).unwrap();
-        assert!(ui.is_running());
+        assert!(app.is_running());
 
-        assert_eq!(ui.selection.active, Category::Artist);
+        assert_eq!(app.selection.active, Category::Artist);
-        assert_eq!(ui.selection.artist.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.state.selected(), Some(0));
-        assert_eq!(ui.selection.artist.album.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.album.state.selected(), Some(0));
-        assert_eq!(ui.selection.artist.album.track.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.album.track.state.selected(), Some(0));
 
-        ui.increment_selection();
+        app.increment_selection();
-        assert_eq!(ui.selection.active, Category::Artist);
+        assert_eq!(app.selection.active, Category::Artist);
-        assert_eq!(ui.selection.artist.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.album.state.selected(), Some(0));
-        assert_eq!(ui.selection.artist.album.track.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.album.track.state.selected(), Some(0));
 
-        ui.increment_category();
+        app.increment_category();
-        assert_eq!(ui.selection.active, Category::Album);
+        assert_eq!(app.selection.active, Category::Album);
-        assert_eq!(ui.selection.artist.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.album.state.selected(), Some(0));
-        assert_eq!(ui.selection.artist.album.track.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.album.track.state.selected(), Some(0));
 
-        ui.increment_selection();
+        app.increment_selection();
-        assert_eq!(ui.selection.active, Category::Album);
+        assert_eq!(app.selection.active, Category::Album);
-        assert_eq!(ui.selection.artist.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.album.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.track.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.album.track.state.selected(), Some(0));
 
-        ui.increment_category();
+        app.increment_category();
-        assert_eq!(ui.selection.active, Category::Track);
+        assert_eq!(app.selection.active, Category::Track);
-        assert_eq!(ui.selection.artist.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.album.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.track.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.album.track.state.selected(), Some(0));
 
-        ui.increment_selection();
+        app.increment_selection();
-        assert_eq!(ui.selection.active, Category::Track);
+        assert_eq!(app.selection.active, Category::Track);
-        assert_eq!(ui.selection.artist.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.album.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.track.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.album.track.state.selected(), Some(1));
 
-        ui.increment_category();
+        app.increment_category();
-        assert_eq!(ui.selection.active, Category::Track);
+        assert_eq!(app.selection.active, Category::Track);
-        assert_eq!(ui.selection.artist.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.album.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.track.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.album.track.state.selected(), Some(1));
 
-        ui.decrement_selection();
+        app.decrement_selection();
-        assert_eq!(ui.selection.active, Category::Track);
+        assert_eq!(app.selection.active, Category::Track);
-        assert_eq!(ui.selection.artist.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.album.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.track.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.album.track.state.selected(), Some(0));
 
-        ui.increment_selection();
+        app.increment_selection();
-        ui.decrement_category();
+        app.decrement_category();
-        assert_eq!(ui.selection.active, Category::Album);
+        assert_eq!(app.selection.active, Category::Album);
-        assert_eq!(ui.selection.artist.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.album.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.track.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.album.track.state.selected(), Some(1));
 
-        ui.decrement_selection();
+        app.decrement_selection();
-        assert_eq!(ui.selection.active, Category::Album);
+        assert_eq!(app.selection.active, Category::Album);
-        assert_eq!(ui.selection.artist.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.album.state.selected(), Some(0));
-        assert_eq!(ui.selection.artist.album.track.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.album.track.state.selected(), Some(0));
 
-        ui.increment_selection();
+        app.increment_selection();
-        ui.decrement_category();
+        app.decrement_category();
-        assert_eq!(ui.selection.active, Category::Artist);
+        assert_eq!(app.selection.active, Category::Artist);
-        assert_eq!(ui.selection.artist.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.album.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.track.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.album.track.state.selected(), Some(0));
 
-        ui.decrement_selection();
+        app.decrement_selection();
-        assert_eq!(ui.selection.active, Category::Artist);
+        assert_eq!(app.selection.active, Category::Artist);
-        assert_eq!(ui.selection.artist.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.state.selected(), Some(0));
-        assert_eq!(ui.selection.artist.album.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.album.state.selected(), Some(0));
-        assert_eq!(ui.selection.artist.album.track.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.album.track.state.selected(), Some(0));
 
-        ui.increment_category();
+        app.increment_category();
-        ui.increment_selection();
+        app.increment_selection();
-        ui.decrement_category();
+        app.decrement_category();
-        ui.decrement_selection();
+        app.decrement_selection();
-        ui.decrement_category();
+        app.decrement_category();
-        assert_eq!(ui.selection.active, Category::Artist);
+        assert_eq!(app.selection.active, Category::Artist);
-        assert_eq!(ui.selection.artist.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.state.selected(), Some(0));
-        assert_eq!(ui.selection.artist.album.state.selected(), Some(1));
+        assert_eq!(app.selection.artist.album.state.selected(), Some(1));
-        assert_eq!(ui.selection.artist.album.track.state.selected(), Some(0));
+        assert_eq!(app.selection.artist.album.track.state.selected(), Some(0));
     }
 
     #[test]
@@ -761,7 +759,7 @@ mod tests {
         let mut collection = COLLECTION.to_owned();
         collection[0].albums[0].tracks = vec![];
 
-        let mut app = Ui::new(music_hoard(collection)).unwrap();
+        let mut app = App::new(music_hoard(collection)).unwrap();
         assert!(app.is_running());
 
         assert_eq!(app.selection.active, Category::Artist);
@@ -790,7 +788,7 @@ mod tests {
         let mut collection = COLLECTION.to_owned();
         collection[0].albums = vec![];
 
-        let mut app = Ui::new(music_hoard(collection)).unwrap();
+        let mut app = App::new(music_hoard(collection)).unwrap();
         assert!(app.is_running());
 
         assert_eq!(app.selection.active, Category::Artist);
@@ -829,7 +827,7 @@ mod tests {
 
     #[test]
     fn no_artists() {
-        let mut app = Ui::new(music_hoard(vec![])).unwrap();
+        let mut app = App::new(music_hoard(vec![])).unwrap();
         assert!(app.is_running());
 
         assert_eq!(app.selection.active, Category::Artist);
@@ -882,49 +880,30 @@ mod tests {
 
     #[test]
     fn info_overlay() {
-        let mut terminal = terminal();
+        let mut app = App::new(music_hoard(COLLECTION.to_owned())).unwrap();
-        let renderer = Renderer;
+        assert!(app.state().is_browse());
 
-        let mut ui = ui(COLLECTION.to_owned());
+        app.show_info_overlay();
-        assert!(ui.state().is_browse());
+        assert!(app.state().is_info());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
 
-        ui.show_info_overlay();
+        app.hide_info_overlay();
-        assert!(ui.state().is_info());
+        assert!(app.state().is_browse());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
-
-        // Change the artist (which has a multi-link entry).
-        ui.increment_selection();
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
-
-        ui.hide_info_overlay();
-        assert!(ui.state().is_browse());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
     }
 
     #[test]
     fn reload_go_back() {
-        let mut terminal = terminal();
+        let mut app = App::new(music_hoard(COLLECTION.to_owned())).unwrap();
-        let renderer = Renderer;
+        assert!(app.state().is_browse());
-        let music_hoard = music_hoard(COLLECTION.to_owned());
 
-        let mut ui = Ui::new(music_hoard).unwrap();
+        app.show_reload_menu();
-        assert!(ui.state().is_browse());
+        assert!(app.state().is_reload());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
 
-        ui.show_reload_menu();
+        app.go_back();
-        assert!(ui.state().is_reload());
+        assert!(app.state().is_browse());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
-
-        ui.go_back();
-        assert!(ui.state().is_browse());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
     }
 
     #[test]
     fn reload_database() {
-        let mut terminal = terminal();
-        let renderer = Renderer;
         let mut music_hoard = music_hoard(COLLECTION.to_owned());
 
         music_hoard
@@ -932,23 +911,18 @@ mod tests {
             .times(1)
             .return_once(|| Ok(()));
 
-        let mut ui = Ui::new(music_hoard).unwrap();
+        let mut app = App::new(music_hoard).unwrap();
-        assert!(ui.state().is_browse());
+        assert!(app.state().is_browse());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
 
-        ui.show_reload_menu();
+        app.show_reload_menu();
-        assert!(ui.state().is_reload());
+        assert!(app.state().is_reload());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
 
-        ui.reload_database();
+        app.reload_database();
-        assert!(ui.state().is_browse());
+        assert!(app.state().is_browse());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
     }
 
     #[test]
     fn reload_library() {
-        let mut terminal = terminal();
-        let renderer = Renderer;
         let mut music_hoard = music_hoard(COLLECTION.to_owned());
 
         music_hoard
@@ -956,23 +930,18 @@ mod tests {
             .times(1)
             .return_once(|| Ok(()));
 
-        let mut ui = Ui::new(music_hoard).unwrap();
+        let mut app = App::new(music_hoard).unwrap();
-        assert!(ui.state().is_browse());
+        assert!(app.state().is_browse());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
 
-        ui.show_reload_menu();
+        app.show_reload_menu();
-        assert!(ui.state().is_reload());
+        assert!(app.state().is_reload());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
 
-        ui.reload_library();
+        app.reload_library();
-        assert!(ui.state().is_browse());
+        assert!(app.state().is_browse());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
     }
 
     #[test]
     fn reload_error() {
-        let mut terminal = terminal();
-        let renderer = Renderer;
         let mut music_hoard = music_hoard(COLLECTION.to_owned());
 
         music_hoard
@@ -980,29 +949,25 @@ mod tests {
             .times(1)
             .return_once(|| Err(musichoard::Error::DatabaseError(String::from("get rekt"))));
 
-        let mut ui = Ui::new(music_hoard).unwrap();
+        let mut app = App::new(music_hoard).unwrap();
-        assert!(ui.state().is_browse());
+        assert!(app.state().is_browse());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
 
-        ui.show_reload_menu();
+        app.show_reload_menu();
-        assert!(ui.state().is_reload());
+        assert!(app.state().is_reload());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
 
-        ui.reload_database();
+        app.reload_database();
-        assert!(ui.state().is_error());
+        assert!(app.state().is_error());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
 
-        ui.dismiss_error();
+        app.dismiss_error();
-        assert!(ui.state().is_browse());
+        assert!(app.state().is_browse());
-        terminal.draw(|frame| ui.render(&renderer, frame)).unwrap();
     }
 
     #[test]
     fn errors() {
-        let ui_err: UiError = musichoard::Error::DatabaseError(String::from("get rekt")).into();
+        let app_err: AppError = musichoard::Error::DatabaseError(String::from("get rekt")).into();
 
-        assert!(!ui_err.to_string().is_empty());
+        assert!(!app_err.to_string().is_empty());
 
-        assert!(!format!("{:?}", ui_err).is_empty());
+        assert!(!format!("{:?}", app_err).is_empty());
     }
 }

src/tui/event.rs

@@ -2,14 +2,14 @@ use crossterm::event::{KeyEvent, MouseEvent};
 use std::fmt;
 use std::sync::mpsc;
 
-use crate::tui::ui::UiError;
+use crate::tui::app::AppError;
 
 #[derive(Debug)]
 pub enum EventError {
     Send(Event),
     Recv,
     Io(std::io::Error),
-    Ui(String),
+    App(String),
 }
 
 impl fmt::Display for EventError {
@@ -20,8 +20,11 @@ impl fmt::Display for EventError {
             Self::Io(ref e) => {
                 write!(f, "an I/O error was triggered during event handling: {e}")
             }
-            Self::Ui(ref s) => {
+            Self::App(ref s) => {
-                write!(f, "the UI returned an error during event handling: {s}")
+                write!(
+                    f,
+                    "the application returned an error during event handling: {s}"
+                )
             }
         }
     }
@@ -39,9 +42,9 @@ impl From<mpsc::RecvError> for EventError {
     }
 }
 
-impl From<UiError> for EventError {
+impl From<AppError> for EventError {
-    fn from(err: UiError) -> EventError {
+    fn from(err: AppError) -> EventError {
-        EventError::Ui(err.to_string())
+        EventError::App(err.to_string())
     }
 }
 
@@ -102,8 +105,6 @@ mod tests {
 
     use crossterm::event::{KeyCode, KeyEvent, KeyEventKind, KeyEventState, KeyModifiers};
 
-    use crate::tui::ui::UiError;
-
     use super::*;
 
     #[test]
@@ -147,16 +148,16 @@ mod tests {
         }));
         let recv_err = EventError::Recv;
         let io_err = EventError::Io(io::Error::new(io::ErrorKind::Interrupted, "interrupted"));
-        let ui_err: EventError = UiError::Lib(String::from("lib error")).into();
+        let app_err: EventError = AppError::Lib(String::from("lib error")).into();
 
         assert!(!send_err.to_string().is_empty());
         assert!(!recv_err.to_string().is_empty());
         assert!(!io_err.to_string().is_empty());
-        assert!(!ui_err.to_string().is_empty());
+        assert!(!app_err.to_string().is_empty());
 
         assert!(!format!("{:?}", send_err).is_empty());
         assert!(!format!("{:?}", recv_err).is_empty());
         assert!(!format!("{:?}", io_err).is_empty());
-        assert!(!format!("{:?}", ui_err).is_empty());
+        assert!(!format!("{:?}", app_err).is_empty());
     }
 }

src/tui/handler.rs

@@ -1,39 +1,41 @@
+// FIXME: Can code here be less verbose
 use crossterm::event::{KeyCode, KeyEvent, KeyModifiers};
 
 #[cfg(test)]
 use mockall::automock;
 
 use crate::tui::{
+    app::{
+        AppState, IAppInteract, IAppInteractBrowse, IAppInteractError, IAppInteractInfo,
+        IAppInteractReload,
+    },
     event::{Event, EventError, EventReceiver},
-    ui::{IUi, IUiBrowse, IUiError, IUiInfo, UiState},
 };
 
-use super::ui::IUiReload;
-
 #[cfg_attr(test, automock)]
-pub trait IEventHandler<UI: IUi> {
+pub trait IEventHandler<APP: IAppInteract> {
-    fn handle_next_event(&self, ui: &mut UI) -> Result<(), EventError>;
+    fn handle_next_event(&self, app: &mut APP) -> Result<(), EventError>;
 }
 
-trait IEventHandlerPrivate<UI: IUi> {
+trait IEventHandlerPrivate<APP: IAppInteract> {
-    fn handle_key_event(ui: &mut UI, key_event: KeyEvent) -> Result<(), EventError>;
+    fn handle_key_event(app: &mut APP, key_event: KeyEvent) -> Result<(), EventError>;
     fn handle_browse_key_event(
-        ui: &mut <UI as IUi>::BS,
+        app: &mut <APP as IAppInteract>::BS,
         key_event: KeyEvent,
     ) -> Result<(), EventError>;
     fn handle_info_key_event(
-        ui: &mut <UI as IUi>::IS,
+        app: &mut <APP as IAppInteract>::IS,
         key_event: KeyEvent,
     ) -> Result<(), EventError>;
     fn handle_reload_key_event(
-        ui: &mut <UI as IUi>::RS,
+        app: &mut <APP as IAppInteract>::RS,
         key_event: KeyEvent,
     ) -> Result<(), EventError>;
     fn handle_error_key_event(
-        ui: &mut <UI as IUi>::ES,
+        app: &mut <APP as IAppInteract>::ES,
         key_event: KeyEvent,
     ) -> Result<(), EventError>;
-    fn quit(ui: &mut UI) -> Result<(), EventError>;
+    fn quit(app: &mut APP) -> Result<(), EventError>;
 }
 
 pub struct EventHandler {
@@ -47,10 +49,10 @@ impl EventHandler {
     }
 }
 
-impl<UI: IUi> IEventHandler<UI> for EventHandler {
+impl<APP: IAppInteract> IEventHandler<APP> for EventHandler {
-    fn handle_next_event(&self, ui: &mut UI) -> Result<(), EventError> {
+    fn handle_next_event(&self, app: &mut APP) -> Result<(), EventError> {
         match self.events.recv()? {
-            Event::Key(key_event) => Self::handle_key_event(ui, key_event)?,
+            Event::Key(key_event) => Self::handle_key_event(app, key_event)?,
             Event::Mouse(_) => {}
             Event::Resize(_, _) => {}
         };
@@ -58,31 +60,35 @@ impl<UI: IUi> IEventHandler<UI> for EventHandler {
     }
 }
 
-impl<UI: IUi> IEventHandlerPrivate<UI> for EventHandler {
+impl<APP: IAppInteract> IEventHandlerPrivate<APP> for EventHandler {
-    fn handle_key_event(ui: &mut UI, key_event: KeyEvent) -> Result<(), EventError> {
+    fn handle_key_event(app: &mut APP, key_event: KeyEvent) -> Result<(), EventError> {
         match key_event.code {
             // Exit application on `ESC` or `q`.
             KeyCode::Esc | KeyCode::Char('q') => {
-                Self::quit(ui)?;
+                Self::quit(app)?;
             }
             // Exit application on `Ctrl-C`.
             KeyCode::Char('c') | KeyCode::Char('C') => {
                 if key_event.modifiers == KeyModifiers::CONTROL {
-                    Self::quit(ui)?;
+                    Self::quit(app)?;
                 }
             }
-            _ => match ui.state() {
+            _ => match app.state() {
-                UiState::Browse(browse) => {
+                AppState::Browse(browse) => {
-                    <Self as IEventHandlerPrivate<UI>>::handle_browse_key_event(browse, key_event)?;
+                    <Self as IEventHandlerPrivate<APP>>::handle_browse_key_event(
+                        browse, key_event,
+                    )?;
                 }
-                UiState::Info(info) => {
+                AppState::Info(info) => {
-                    <Self as IEventHandlerPrivate<UI>>::handle_info_key_event(info, key_event)?;
+                    <Self as IEventHandlerPrivate<APP>>::handle_info_key_event(info, key_event)?;
                 }
-                UiState::Reload(reload) => {
+                AppState::Reload(reload) => {
-                    <Self as IEventHandlerPrivate<UI>>::handle_reload_key_event(reload, key_event)?;
+                    <Self as IEventHandlerPrivate<APP>>::handle_reload_key_event(
+                        reload, key_event,
+                    )?;
                 }
-                UiState::Error(error) => {
+                AppState::Error(error) => {
-                    <Self as IEventHandlerPrivate<UI>>::handle_error_key_event(error, key_event)?;
+                    <Self as IEventHandlerPrivate<APP>>::handle_error_key_event(error, key_event)?;
                 }
             },
         };
@@ -90,20 +96,20 @@ impl<UI: IUi> IEventHandlerPrivate<UI> for EventHandler {
     }
 
     fn handle_browse_key_event(
-        ui: &mut <UI as IUi>::BS,
+        app: &mut <APP as IAppInteract>::BS,
         key_event: KeyEvent,
     ) -> Result<(), EventError> {
         match key_event.code {
             // Category change.
-            KeyCode::Left => ui.decrement_category(),
+            KeyCode::Left => app.decrement_category(),
-            KeyCode::Right => ui.increment_category(),
+            KeyCode::Right => app.increment_category(),
             // Selection change.
-            KeyCode::Up => ui.decrement_selection(),
+            KeyCode::Up => app.decrement_selection(),
-            KeyCode::Down => ui.increment_selection(),
+            KeyCode::Down => app.increment_selection(),
             // Toggle overlay.
-            KeyCode::Char('m') | KeyCode::Char('M') => ui.show_info_overlay(),
+            KeyCode::Char('m') | KeyCode::Char('M') => app.show_info_overlay(),
             // Toggle Reload
-            KeyCode::Char('g') | KeyCode::Char('G') => ui.show_reload_menu(),
+            KeyCode::Char('g') | KeyCode::Char('G') => app.show_reload_menu(),
             // Othey keys.
             _ => {}
         }
@@ -112,12 +118,12 @@ impl<UI: IUi> IEventHandlerPrivate<UI> for EventHandler {
     }
 
     fn handle_info_key_event(
-        ui: &mut <UI as IUi>::IS,
+        app: &mut <APP as IAppInteract>::IS,
         key_event: KeyEvent,
     ) -> Result<(), EventError> {
         match key_event.code {
             // Toggle overlay.
-            KeyCode::Char('m') | KeyCode::Char('M') => ui.hide_info_overlay(),
+            KeyCode::Char('m') | KeyCode::Char('M') => app.hide_info_overlay(),
             // Othey keys.
             _ => {}
         }
@@ -126,15 +132,15 @@ impl<UI: IUi> IEventHandlerPrivate<UI> for EventHandler {
     }
 
     fn handle_reload_key_event(
-        ui: &mut <UI as IUi>::RS,
+        app: &mut <APP as IAppInteract>::RS,
         key_event: KeyEvent,
     ) -> Result<(), EventError> {
         match key_event.code {
             // Reload keys.
-            KeyCode::Char('l') | KeyCode::Char('L') => ui.reload_library(),
+            KeyCode::Char('l') | KeyCode::Char('L') => app.reload_library(),
-            KeyCode::Char('d') | KeyCode::Char('D') => ui.reload_database(),
+            KeyCode::Char('d') | KeyCode::Char('D') => app.reload_database(),
             // Return.
-            KeyCode::Char('g') | KeyCode::Char('G') => ui.go_back(),
+            KeyCode::Char('g') | KeyCode::Char('G') => app.go_back(),
             // Othey keys.
             _ => {}
         }
@@ -143,17 +149,17 @@ impl<UI: IUi> IEventHandlerPrivate<UI> for EventHandler {
     }
 
     fn handle_error_key_event(
-        ui: &mut <UI as IUi>::ES,
+        app: &mut <APP as IAppInteract>::ES,
         _key_event: KeyEvent,
     ) -> Result<(), EventError> {
         // Any key dismisses the error.
-        ui.dismiss_error();
+        app.dismiss_error();
         Ok(())
     }
 
-    fn quit(ui: &mut UI) -> Result<(), EventError> {
+    fn quit(app: &mut APP) -> Result<(), EventError> {
-        ui.quit();
+        app.quit();
-        ui.save()?;
+        app.save()?;
         Ok(())
     }
 }

src/tui/mod.rs

@@ -1,9 +1,15 @@
-pub mod event;
+mod app;
-pub mod handler;
+mod event;
-pub mod listener;
+mod handler;
-pub mod ui;
-
 mod lib;
+mod listener;
+mod ui;
+
+pub use app::App;
+pub use event::EventChannel;
+pub use handler::EventHandler;
+pub use listener::EventListener;
+pub use ui::Ui;
 
 use crossterm::event::{DisableMouseCapture, EnableMouseCapture};
 use crossterm::terminal::{self, EnterAlternateScreen, LeaveAlternateScreen};
@@ -12,10 +18,13 @@ use ratatui::Terminal;
 use std::io;
 use std::marker::PhantomData;
 
-use self::event::EventError;
+use crate::tui::{
-use self::handler::IEventHandler;
+    app::{IAppAccess, IAppInteract},
-use self::listener::IEventListener;
+    event::EventError,
-use self::ui::{render::IRender, IUi};
+    handler::IEventHandler,
+    listener::IEventListener,
+    ui::IUi,
+};
 
 #[derive(Debug, PartialEq, Eq)]
 pub enum Error {
@@ -43,12 +52,12 @@ impl From<EventError> for Error {
     }
 }
 
-pub struct Tui<B: Backend, R: IRender, UI: IUi> {
+pub struct Tui<B: Backend, UI: IUi, APP: IAppInteract + IAppAccess> {
     terminal: Terminal<B>,
-    _phantom: PhantomData<(R, UI)>,
+    _phantom: PhantomData<(UI, APP)>,
 }
 
-impl<B: Backend, R: IRender, UI: IUi> Tui<B, R, UI> {
+impl<B: Backend, UI: IUi, APP: IAppInteract + IAppAccess> Tui<B, UI, APP> {
     fn init(&mut self) -> Result<(), Error> {
         self.terminal.hide_cursor()?;
         self.terminal.clear()?;
@@ -67,13 +76,16 @@ impl<B: Backend, R: IRender, UI: IUi> Tui<B, R, UI> {
 
     fn main_loop(
         &mut self,
-        mut ui: UI,
+        mut app: APP,
-        renderer: R,
+        _ui: UI,
-        handler: impl IEventHandler<UI>,
+        handler: impl IEventHandler<APP>,
     ) -> Result<(), Error> {
-        while ui.is_running() {
+        while app.is_running() {
-            self.terminal.draw(|frame| ui.render(&renderer, frame))?;
+            // FIXME: rendering logic should be in render.rs - reverse Renderer/Ui relationship so
-            handler.handle_next_event(&mut ui)?;
+            // that TAPP calls are renderer.render(ui, frame); Then rename ui -> app and render -> ui
+            // as it used to be originally.
+            self.terminal.draw(|frame| UI::render(&mut app, frame))?;
+            handler.handle_next_event(&mut app)?;
         }
 
         Ok(())
@@ -81,9 +93,9 @@ impl<B: Backend, R: IRender, UI: IUi> Tui<B, R, UI> {
 
     fn main(
         term: Terminal<B>,
+        app: APP,
         ui: UI,
-        renderer: R,
+        handler: impl IEventHandler<APP>,
-        handler: impl IEventHandler<UI>,
         listener: impl IEventListener,
     ) -> Result<(), Error> {
         let mut tui = Tui {
@@ -94,7 +106,7 @@ impl<B: Backend, R: IRender, UI: IUi> Tui<B, R, UI> {
         tui.init()?;
 
         let listener_handle = listener.spawn();
-        let result = tui.main_loop(ui, renderer, handler);
+        let result = tui.main_loop(app, ui, handler);
 
         match result {
             Ok(_) => {
@@ -111,7 +123,7 @@ impl<B: Backend, R: IRender, UI: IUi> Tui<B, R, UI> {
                         Ok(err) => return Err(err.into()),
                         // Calling std::panic::resume_unwind(err) as recommended by the Rust docs
                         // will not produce an error message. The panic error message is printed at
-                        // the location of the panic which at the time is hidden by the TUI.
+                        // the location of the panic which at the time is hidden by the TAPP.
                         Err(_) => return Err(Error::ListenerPanic),
                     }
                 }
@@ -141,13 +153,13 @@ impl<B: Backend, R: IRender, UI: IUi> Tui<B, R, UI> {
 
     pub fn run(
         term: Terminal<B>,
+        app: APP,
         ui: UI,
-        renderer: R,
+        handler: impl IEventHandler<APP>,
-        handler: impl IEventHandler<UI>,
         listener: impl IEventListener,
     ) -> Result<(), Error> {
         Self::enable()?;
-        let result = Self::main(term, ui, renderer, handler, listener);
+        let result = Self::main(term, app, ui, handler, listener);
         match result {
             Ok(_) => {
                 Self::disable()?;
@@ -176,10 +188,8 @@ mod tests {
     use musichoard::collection::Collection;
 
     use crate::tui::{
-        handler::MockIEventHandler,
+        app::App, handler::MockIEventHandler, lib::MockIMusicHoard, listener::MockIEventListener,
-        lib::MockIMusicHoard,
+        ui::Ui,
-        listener::MockIEventListener,
-        ui::{render::Renderer, Ui},
     };
 
     use super::*;
@@ -190,7 +200,7 @@ mod tests {
         Terminal::new(backend).unwrap()
     }
 
-    pub fn music_hoard(collection: Collection) -> MockIMusicHoard {
+    fn music_hoard(collection: Collection) -> MockIMusicHoard {
         let mut music_hoard = MockIMusicHoard::new();
 
         music_hoard.expect_load_from_database().returning(|| Ok(()));
@@ -200,8 +210,8 @@ mod tests {
         music_hoard
     }
 
-    pub fn ui(collection: Collection) -> Ui<MockIMusicHoard> {
+    fn app(collection: Collection) -> App<MockIMusicHoard> {
-        Ui::new(music_hoard(collection)).unwrap()
+        App::new(music_hoard(collection)).unwrap()
     }
 
     fn listener() -> MockIEventListener {
@@ -215,12 +225,12 @@ mod tests {
         listener
     }
 
-    fn handler() -> MockIEventHandler<Ui<MockIMusicHoard>> {
+    fn handler() -> MockIEventHandler<App<MockIMusicHoard>> {
         let mut handler = MockIEventHandler::new();
         handler
             .expect_handle_next_event()
-            .return_once(|ui: &mut Ui<MockIMusicHoard>| {
+            .return_once(|app: &mut App<MockIMusicHoard>| {
-                ui.quit();
+                app.quit();
                 Ok(())
             });
         handler
@@ -229,21 +239,21 @@ mod tests {
     #[test]
     fn run() {
         let terminal = terminal();
-        let ui = ui(COLLECTION.to_owned());
+        let app = app(COLLECTION.to_owned());
-        let renderer = Renderer;
+        let ui = Ui;
 
         let listener = listener();
         let handler = handler();
 
-        let result = Tui::main(terminal, ui, renderer, handler, listener);
+        let result = Tui::main(terminal, app, ui, handler, listener);
         assert!(result.is_ok());
     }
 
     #[test]
     fn event_error() {
         let terminal = terminal();
-        let ui = ui(COLLECTION.to_owned());
+        let app = app(COLLECTION.to_owned());
-        let renderer = Renderer;
+        let ui = Ui;
 
         let listener = listener();
 
@@ -252,7 +262,7 @@ mod tests {
             .expect_handle_next_event()
             .return_once(|_| Err(EventError::Recv));
 
-        let result = Tui::main(terminal, ui, renderer, handler, listener);
+        let result = Tui::main(terminal, app, ui, handler, listener);
         assert!(result.is_err());
         assert_eq!(
             result.unwrap_err(),
@@ -263,8 +273,8 @@ mod tests {
     #[test]
     fn listener_error() {
         let terminal = terminal();
-        let ui = ui(COLLECTION.to_owned());
+        let app = app(COLLECTION.to_owned());
-        let renderer = Renderer;
+        let ui = Ui;
 
         let error = EventError::Io(io::Error::new(io::ErrorKind::Interrupted, "error"));
         let listener_handle: thread::JoinHandle<EventError> = thread::spawn(|| error);
@@ -278,7 +288,7 @@ mod tests {
             .expect_handle_next_event()
             .return_once(|_| Err(EventError::Recv));
 
-        let result = Tui::main(terminal, ui, renderer, handler, listener);
+        let result = Tui::main(terminal, app, ui, handler, listener);
         assert!(result.is_err());
 
         let error = EventError::Io(io::Error::new(io::ErrorKind::Interrupted, "error"));
@@ -288,8 +298,8 @@ mod tests {
     #[test]
     fn listener_panic() {
         let terminal = terminal();
-        let ui = ui(COLLECTION.to_owned());
+        let app = app(COLLECTION.to_owned());
-        let renderer = Renderer;
+        let ui = Ui;
 
         let listener_handle: thread::JoinHandle<EventError> = thread::spawn(|| panic!());
         while !listener_handle.is_finished() {}
@@ -302,7 +312,7 @@ mod tests {
             .expect_handle_next_event()
             .return_once(|_| Err(EventError::Recv));
 
-        let result = Tui::main(terminal, ui, renderer, handler, listener);
+        let result = Tui::main(terminal, app, ui, handler, listener);
         assert!(result.is_err());
         assert_eq!(result.unwrap_err(), Error::ListenerPanic);
     }

src/tui/ui.rs

@@ -12,21 +12,10 @@ use ratatui::{
     Frame,
 };
 
-use crate::tui::ui::{Category, Selection};
+use crate::tui::app::{AppState, Category, IAppAccess, Selection};
 
-pub trait IRender {
+pub trait IUi {
-    fn render_collection<B: Backend>(
+    fn render<APP: IAppAccess, B: Backend>(app: &mut APP, frame: &mut Frame<'_, B>);
-        artists: &Collection,
-        selection: &mut Selection,
-        frame: &mut Frame<'_, B>,
-    );
-    fn render_info_overlay<B: Backend>(
-        artists: &Collection,
-        selection: &mut Selection,
-        frame: &mut Frame<'_, B>,
-    );
-    fn render_reload_overlay<B: Backend>(frame: &mut Frame<'_, B>);
-    fn render_error_overlay<S: AsRef<str>, B: Backend>(msg: S, frame: &mut Frame<'_, B>);
 }
 
 struct ArtistArea {
@@ -314,9 +303,9 @@ impl<'a, 'b> TrackState<'a, 'b> {
     }
 }
 
-pub struct Renderer;
+pub struct Ui;
 
-impl Renderer {
+impl Ui {
     fn style(_active: bool) -> Style {
         Style::default().fg(Color::White).bg(Color::Black)
     }
@@ -403,9 +392,7 @@ impl Renderer {
         Self::render_list_widget("Tracks", st.list, st.state, st.active, ar.list, fr);
         Self::render_info_widget("Track info", st.info, st.active, ar.info, fr);
     }
-}
 
-impl IRender for Renderer {
     fn render_collection<B: Backend>(
         artists: &Collection,
         selection: &mut Selection,
@@ -496,56 +483,59 @@ impl IRender for Renderer {
     }
 }
 
+impl IUi for Ui {
+    fn render<APP: IAppAccess, B: Backend>(app: &mut APP, frame: &mut Frame<'_, B>) {
+        let app = app.get();
+
+        let collection = app.collection;
+        let selection = app.selection;
+
+        Self::render_collection(collection, selection, frame);
+        match app.state {
+            AppState::Info(_) => Self::render_info_overlay(collection, selection, frame),
+            AppState::Reload(_) => Self::render_reload_overlay(frame),
+            AppState::Error(ref msg) => Self::render_error_overlay(msg, frame),
+            _ => {}
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
-    use crate::tui::{testmod::COLLECTION, tests::terminal};
+    use crate::tui::{app::AppPublic, testmod::COLLECTION, tests::terminal};
 
     use super::*;
 
-    fn draw_test_suite(artists: &Collection, selection: &mut Selection) {
+    // Automock does not support returning types with generic lifetimes.
-        let mut terminal = terminal();
+    impl IAppAccess for AppPublic<'_> {
-
+        fn get(&mut self) -> AppPublic {
-        terminal
+            AppPublic {
-            .draw(|frame| Renderer::render_collection(artists, selection, frame))
+                collection: self.collection,
-            .unwrap();
+                selection: self.selection,
-
+                state: self.state,
-        terminal
+            }
-            .draw(|frame| Renderer::render_info_overlay(artists, selection, frame))
+        }
-            .unwrap();
-
-        terminal
-            .draw(|frame| {
-                Renderer::render_collection(artists, selection, frame);
-                Renderer::render_info_overlay(artists, selection, frame);
-            })
-            .unwrap();
-
-        terminal
-            .draw(|frame| {
-                Renderer::render_collection(artists, selection, frame);
-                Renderer::render_reload_overlay(frame);
-            })
-            .unwrap();
-
-        terminal
-            .draw(|frame| {
-                Renderer::render_collection(artists, selection, frame);
-                Renderer::render_error_overlay("get rekt scrub", frame);
-            })
-            .unwrap();
     }
 
-    #[test]
+    fn draw_test_suite(collection: &Collection, selection: &mut Selection) {
-    fn stateless() {
         let mut terminal = terminal();
 
-        terminal
+        let mut app = AppPublic {
-            .draw(|frame| Renderer::render_reload_overlay(frame))
+            collection,
-            .unwrap();
+            selection,
+            state: &AppState::Browse(()),
+        };
+        terminal.draw(|frame| Ui::render(&mut app, frame)).unwrap();
 
-        terminal
+        app.state = &AppState::Info(());
-            .draw(|frame| Renderer::render_error_overlay("get rekt scrub", frame))
+        terminal.draw(|frame| Ui::render(&mut app, frame)).unwrap();
-            .unwrap();
+
+        app.state = &AppState::Reload(());
+        terminal.draw(|frame| Ui::render(&mut app, frame)).unwrap();
+
+        let binding = AppState::Error(String::from("get rekt scrub"));
+        app.state = &binding;
+        terminal.draw(|frame| Ui::render(&mut app, frame)).unwrap();
     }
 
     #[test]
@@ -558,16 +548,23 @@ mod tests {
 
     #[test]
     fn collection() {
-        let artists: &Collection = &COLLECTION;
+        let artists = &COLLECTION;
         let mut selection = Selection::new(Some(artists));
 
-        draw_test_suite(&artists, &mut selection);
+        draw_test_suite(artists, &mut selection);
 
         // Change the track (which has a different track format).
         selection.increment_category();
         selection.increment_category();
         selection.increment_selection(artists);
 
-        draw_test_suite(&artists, &mut selection);
+        draw_test_suite(artists, &mut selection);
+
+        // Change the artist (which has a multi-link entry).
+        selection.decrement_category();
+        selection.decrement_category();
+        selection.increment_selection(artists);
+
+        draw_test_suite(artists, &mut selection);
     }
 }