wip2 (205e): layout

crates/tek_layout/src/layers.rs

@@ -1,9 +1,5 @@
 use crate::*;
 
-#[macro_export] macro_rules! lay {
-    ($($expr:expr),* $(,)?) => { Layers::new(move|add|{ $(add(&$expr)?;)* Ok(()) }) }
-}
-
 pub struct Layers<
     E: Engine,
     F: Send + Sync + Fn(&mut dyn FnMut(&dyn Render<E>)->Usually<()>)->Usually<()>

crates/tek_layout/src/lib.rs

@@ -8,11 +8,47 @@ submod! {
     fixed
     grow
     inset
+    layers
     max
+    measure
     min
     outset
     pull
     push
+    scroll
     shrink
     split
+    stack
+}
+
+#[macro_export] macro_rules! lay {
+    ($($expr:expr),* $(,)?) => { Layers::new(move|add|{ $(add(&$expr)?;)* Ok(()) }) }
+}
+
+#[macro_export] macro_rules! col {
+    ($($expr:expr),* $(,)?) => { Stack::down(move|add|{ $(add(&$expr)?;)* Ok(()) }) };
+    ($pat:pat in $collection:expr => $item:expr) => {
+        Stack::down(move |add|{
+            for $pat in $collection { add(&$item)?; }
+            Ok(())
+        })
+    }
+}
+#[macro_export] macro_rules! col_up {
+    ($($expr:expr),* $(,)?) => { Stack::down(move|add|{ $(add(&$expr)?;)* Ok(()) }) };
+    ($pat:pat in $collection:expr => $item:expr) => {
+        Stack::up(move |add|{
+            for $pat in $collection { add(&$item)?; }
+            Ok(())
+        })
+    }
+}
+#[macro_export] macro_rules! row {
+    ($($expr:expr),* $(,)?) => { Stack::right(move|add|{ $(add(&$expr)?;)* Ok(()) }) };
+    ($pat:pat in $collection:expr => $item:expr) => {
+        Stack::right(move |add|{
+            for $pat in $collection { add(&$item)?; }
+            Ok(())
+        })
+    }
 }

crates/tek_layout/src/max.rs

@@ -1,5 +1,7 @@
 use crate::*;
 
+impl<E: Engine, W: Render<E>> LayoutMax<E> for W {}
+
 pub trait LayoutMax<E: Engine>: Render<E> + Sized {
     fn max_x  (self, x: E::Unit) -> Max<E::Unit, Self> { Max::X(x, self) }
     fn max_y  (self, y: E::Unit) -> Max<E::Unit, Self> { Max::Y(y, self) }

crates/tek_layout/src/min.rs

@@ -1,5 +1,7 @@
 use crate::*;
 
+impl<E: Engine, W: Render<E>> LayoutMin<E> for W {}
+
 pub trait LayoutMin<E: Engine>: Render<E> + Sized {
     fn min_x  (self, x: E::Unit) -> Min<E::Unit, Self> { Min::X(x, self) }
     fn min_y  (self, y: E::Unit) -> Min<E::Unit, Self> { Min::Y(y, self) }

crates/tek_layout/src/stack.rs

@@ -1,33 +1,5 @@
 use crate::*;
 
-#[macro_export] macro_rules! col {
-    ($($expr:expr),* $(,)?) => { Stack::down(move|add|{ $(add(&$expr)?;)* Ok(()) }) };
-    ($pat:pat in $collection:expr => $item:expr) => {
-        Stack::down(move |add|{
-            for $pat in $collection { add(&$item)?; }
-            Ok(())
-        })
-    }
-}
-#[macro_export] macro_rules! col_up {
-    ($($expr:expr),* $(,)?) => { Stack::down(move|add|{ $(add(&$expr)?;)* Ok(()) }) };
-    ($pat:pat in $collection:expr => $item:expr) => {
-        Stack::up(move |add|{
-            for $pat in $collection { add(&$item)?; }
-            Ok(())
-        })
-    }
-}
-#[macro_export] macro_rules! row {
-    ($($expr:expr),* $(,)?) => { Stack::right(move|add|{ $(add(&$expr)?;)* Ok(()) }) };
-    ($pat:pat in $collection:expr => $item:expr) => {
-        Stack::right(move |add|{
-            for $pat in $collection { add(&$item)?; }
-            Ok(())
-        })
-    }
-}
-
 pub struct Stack<
     E: Engine,
     F: Send + Sync + Fn(&mut dyn FnMut(&dyn Render<E>)->Usually<()>)->Usually<()>

crates/tek_tui/src/lib.rs

@@ -1,6 +1,7 @@
 pub(crate) use crossterm::event::{KeyCode, KeyModifiers};
 pub(crate) use tek_core::midly::{num::u7, live::LiveEvent, MidiMessage};
 pub(crate) use tek_core::{*, jack::*};
+pub(crate) use tek_layout::*;
 pub(crate) use tek_api::*;
 
 pub(crate) use std::collections::BTreeMap;
@@ -81,8 +82,8 @@ impl TuiTheme {
 }
 
 pub trait FocusWrap<T> {
-    fn wrap <'a, W: Render<Engine = Tui>> (self, focus: T, content: &'a W)
-        -> impl Render<Engine = Tui> + 'a;
+    fn wrap <'a, W: Render<Tui>> (self, focus: T, content: &'a W)
+        -> impl Render<Tui> + 'a;
 }
 
 pub fn to_focus_command (input: &TuiInput) -> Option<FocusCommand> {
@@ -145,12 +146,12 @@ pub fn to_focus_command (input: &TuiInput) -> Option<FocusCommand> {
     }
 }
 
-pub trait StatusBar: Render<Engine = Tui> {
+pub trait StatusBar: Render<Tui> {
     type State: Send + Sync;
     fn hotkey_fg () -> Color where Self: Sized;
     fn update (&mut self, state: &Self::State) where Self: Sized;
-    fn command (commands: &[[impl Render<Engine = Tui>;3]])
-        -> impl Render<Engine = Tui> + '_
+    fn command (commands: &[[impl Render<Tui>;3]])
+        -> impl Render<Tui> + '_
     where
         Self: Sized
     {
@@ -167,7 +168,7 @@ pub trait StatusBar: Render<Engine = Tui> {
         })
     }
 
-    fn with <'a> (state: &'a Self::State, content: impl Render<Engine=Tui>) -> impl Render<Engine=Tui>
+    fn with <'a> (state: &'a Self::State, content: impl Render<Tui>) -> impl Render<Tui>
         where Self: Sized, &'a Self::State: Into<Self>
     {
         Stack::up(move |add|{
@@ -181,9 +182,9 @@ fn content_with_menu_and_status <'a, A, S, C> (
     content:    &'a A,
     menu_bar:   &'a Option<MenuBar<Tui, S, C>>,
     status_bar: &'a Option<impl StatusBar>
-) -> impl Render<Engine = Tui> + 'a
+) -> impl Render<Tui> + 'a
 where
-    A: Render<Engine = Tui>,
+    A: Render<Tui>,
     S: Send + Sync + 'a,
     C: Command<S>
 {

crates/tek_tui/src/todo_tui_mixer.rs

@@ -95,8 +95,7 @@ pub struct TrackView<'a, E: Engine> {
     pub entered:   bool,
 }
 
-impl<'a> Render for TrackView<'a, Tui> {
-    type Engine = Tui;
+impl<'a> Render<Tui> for TrackView<'a, Tui> {
     fn min_size (&self, area: [u16;2]) -> Perhaps<[u16;2]> {
         todo!()
     }
@@ -130,9 +129,8 @@ impl<'a> Render for TrackView<'a, Tui> {
     }
 }
 
-impl Content for Mixer<Tui> {
-    type Engine = Tui;
-    fn content (&self) -> impl Render<Engine = Tui> {
+impl Content<Tui> for Mixer<Tui> {
+    fn content (&self) -> impl Render<Tui> {
         Stack::right(|add| {
             for channel in self.tracks.iter() {
                 add(channel)?;
@@ -142,9 +140,8 @@ impl Content for Mixer<Tui> {
     }
 }
 
-impl Content for Track<Tui> {
-    type Engine = Tui;
-    fn content (&self) -> impl Render<Engine = Tui> {
+impl Content<Tui> for Track<Tui> {
+    fn content (&self) -> impl Render<Tui> {
         TrackView {
             chain:     Some(&self),
             direction: tek_core::Direction::Right,

crates/tek_tui/src/todo_tui_plugin.rs

@@ -31,8 +31,7 @@ impl<E> Plugin<E> {
         })
     }
 }
-impl Render for Plugin<Tui> {
-    type Engine = Tui;
+impl Render<Tui> for Plugin<Tui> {
     fn min_size (&self, to: [u16;2]) -> Perhaps<[u16;2]> {
         Ok(Some(to))
     }

crates/tek_tui/src/todo_tui_sampler.rs

@@ -316,8 +316,7 @@ impl Sample {
     }
 }
 
-impl Render for SamplerView<Tui> {
-    type Engine = Tui;
+impl Render<Tui> for SamplerView<Tui> {
     fn min_size (&self, to: [u16;2]) -> Perhaps<[u16;2]> {
         todo!()
     }
@@ -371,8 +370,7 @@ fn draw_sample (
     Ok(label1.len() + label2.len() + 4)
 }
 
-impl Render for AddSampleModal {
-    type Engine = Tui;
+impl Render<Tui> for AddSampleModal {
     fn min_size (&self, to: [u16;2]) -> Perhaps<[u16;2]> {
         todo!()
         //Align::Center(()).layout(to)

crates/tek_tui/src/tui_app_arranger.rs

@@ -152,9 +152,8 @@ impl StatusBar for ArrangerStatus {
     }
 }
 
-impl Content for ArrangerStatus {
-    type Engine = Tui;
-    fn content (&self) -> impl Render<Engine = Tui> {
+impl Content<Tui> for ArrangerStatus {
+    fn content (&self) -> impl Render<Tui> {
         let label = match self {
             Self::Transport     => "TRANSPORT",
             Self::ArrangerMix   => "PROJECT",

crates/tek_tui/src/tui_app_transport.rs

@@ -50,8 +50,8 @@ pub enum TransportFocus {
 }
 
 impl FocusWrap<TransportFocus> for TransportFocus {
-    fn wrap <'a, W: Render<Engine = Tui>> (self, focus: TransportFocus, content: &'a W)
-        -> impl Render<Engine = Tui> + 'a
+    fn wrap <'a, W: Render<Tui>> (self, focus: TransportFocus, content: &'a W)
+        -> impl Render<Tui> + 'a
     {
         let focused   = focus == self;
         let corners   = focused.then_some(CORNERS);
@@ -61,8 +61,8 @@ impl FocusWrap<TransportFocus> for TransportFocus {
 }
 
 impl FocusWrap<TransportFocus> for Option<TransportFocus> {
-    fn wrap <'a, W: Render<Engine = Tui>> (self, focus: TransportFocus, content: &'a W)
-        -> impl Render<Engine = Tui> + 'a
+    fn wrap <'a, W: Render<Tui>> (self, focus: TransportFocus, content: &'a W)
+        -> impl Render<Tui> + 'a
     {
         let focused   = Some(focus) == self;
         let corners   = focused.then_some(CORNERS);
@@ -95,9 +95,8 @@ impl StatusBar for TransportStatusBar {
     }
 }
 
-impl Content for TransportStatusBar {
-    type Engine = Tui;
-    fn content (&self) -> impl Render<Engine = Tui> {
+impl Content<Tui> for TransportStatusBar {
+    fn content (&self) -> impl Render<Tui> {
         todo!();
         ""
     }

crates/tek_tui/src/tui_engine_output.rs

@@ -11,7 +11,7 @@ impl Output<Tui> for TuiOutput {
     #[inline] fn area_mut (&mut self) -> &mut [u16;4] { &mut self.area }
     #[inline] fn render_in (&mut self,
         area:   [u16;4],
-        widget: &dyn Render<Engine = Tui>
+        widget: &dyn Render<Tui>
     ) -> Usually<()> {
         let last = self.area();
         *self.area_mut() = area;
@@ -124,8 +124,8 @@ pub fn buffer_update (buf: &mut Buffer, area: [u16;4], callback: &impl Fn(&mut C
         }
     }
 }
-//impl Render for &str {
-    //type Engine = Tui;
+//impl Render<Tui> for &str {
+    //type Tui;
     //fn min_size (&self, _: [u16;2]) -> Perhaps<[u16;2]> {
         //// TODO: line breaks
         //Ok(Some([self.chars().count() as u16, 1]))
@@ -136,8 +136,8 @@ pub fn buffer_update (buf: &mut Buffer, area: [u16;4], callback: &impl Fn(&mut C
         //Ok(to.blit(&self, x, y, None))
     //}
 //}
-//impl Render for String {
-    //type Engine = Tui;
+//impl Render<Tui> for String {
+    //type Tui;
     //fn min_size (&self, _: [u16;2]) -> Perhaps<[u16;2]> {
         //// TODO: line breaks
         //Ok(Some([self.chars().count() as u16, 1]))
@@ -148,8 +148,8 @@ pub fn buffer_update (buf: &mut Buffer, area: [u16;4], callback: &impl Fn(&mut C
         //Ok(to.blit(&self, x, y, None))
     //}
 //}
-//impl<T: Render<Engine = Tui>> Render for DebugOverlay<Tui, T> {
-    //type Engine = Tui;
+//impl<T: Render<Tui>> Render<Tui> for DebugOverlay<Tui, T> {
+    //type Tui;
     //fn min_size (&self, to: [u16;2]) -> Perhaps<[u16;2]> {
         //self.0.min_size(to)
     //}

crates/tek_tui/src/tui_engine_style.rs

@@ -1,7 +1,8 @@
 use crate::*;
-pub struct Styled<T: Render<Engine = Tui>>(pub Option<Style>, pub T);
-impl Render for Styled<&str> {
-    type Engine = Tui;
+
+pub struct Styled<T: Render<Tui>>(pub Option<Style>, pub T);
+
+impl Render<Tui> for Styled<&str> {
     fn min_size (&self, _: [u16;2]) -> Perhaps<[u16;2]> {
         Ok(Some([self.1.chars().count() as u16, 1]))
     }
@@ -12,42 +13,48 @@ impl Render for Styled<&str> {
         Ok(to.blit(&self.1, x, y, None))
     }
 }
-pub trait TuiStyle: Render<Engine = Tui> + Sized {
-    fn fg (self, color: Color) -> impl Render<Engine = Tui> {
+
+pub trait TuiStyle: Render<Tui> + Sized {
+    fn fg (self, color: Color) -> impl Render<Tui> {
         Layers::new(move |add|{ add(&Foreground(color))?; add(&self) })
     }
-    fn bg (self, color: Color) -> impl Render<Engine = Tui> {
+    fn bg (self, color: Color) -> impl Render<Tui> {
         Layers::new(move |add|{ add(&Background(color))?; add(&self) })
     }
-    fn bold (self, on: bool) -> impl Render<Engine = Tui> {
+    fn bold (self, on: bool) -> impl Render<Tui> {
         Layers::new(move |add|{ add(&Bold(on))?; add(&self) })
     }
-    fn border (self, style: impl BorderStyle) -> impl Render<Engine = Tui> {
+    fn border (self, style: impl BorderStyle) -> impl Render<Tui> {
         Bordered(style, self)
     }
 }
-impl<W: Render<Engine = Tui>> TuiStyle for W {}
+
+impl<W: Render<Tui>> TuiStyle for W {}
+
 pub struct Bold(pub bool);
-impl Render for Bold {
-    type Engine = Tui;
+
+impl Render<Tui> for Bold {
     fn min_size (&self, _: [u16;2]) -> Perhaps<[u16;2]> { Ok(Some([0,0])) }
     fn render (&self, to: &mut TuiOutput) -> Usually<()> { Ok(to.fill_bold(to.area(), self.0)) }
 }
+
 pub struct Foreground(pub Color);
-impl Render for Foreground {
-    type Engine = Tui;
+
+impl Render<Tui> for Foreground {
     fn min_size (&self, _: [u16;2]) -> Perhaps<[u16;2]> { Ok(Some([0,0])) }
     fn render (&self, to: &mut TuiOutput) -> Usually<()> { Ok(to.fill_fg(to.area(), self.0)) }
 }
+
 pub struct Background(pub Color);
-impl Render for Background {
-    type Engine = Tui;
+
+impl Render<Tui> for Background {
     fn min_size (&self, _: [u16;2]) -> Perhaps<[u16;2]> { Ok(Some([0,0])) }
     fn render (&self, to: &mut TuiOutput) -> Usually<()> { Ok(to.fill_bg(to.area(), self.0)) }
 }
+
 pub struct Border<S: BorderStyle>(pub S);
-impl<S: BorderStyle> Render for Border<S> {
-    type Engine = Tui;
+
+impl<S: BorderStyle> Render<Tui> for Border<S> {
     fn min_size (&self, _: [u16;2]) -> Perhaps<[u16;2]> {
         Ok(Some([0, 0]))
     }
@@ -70,14 +77,16 @@ impl<S: BorderStyle> Render for Border<S> {
         Ok(())
     }
 }
-pub struct Bordered<S: BorderStyle, W: Render<Engine = Tui>>(pub S, pub W);
-impl<S: BorderStyle, W: Render<Engine = Tui>> Content for Bordered<S, W> {
-    type Engine = Tui;
-    fn content (&self) -> impl Render<Engine = Tui> {
-        let content: &dyn Render<Engine = Tui> = &self.1;
+
+pub struct Bordered<S: BorderStyle, W: Render<Tui>>(pub S, pub W);
+
+impl<S: BorderStyle, W: Render<Tui>> Content<Tui> for Bordered<S, W> {
+    fn content (&self) -> impl Render<Tui> {
+        let content: &dyn Render<Tui> = &self.1;
         lay! { content.inset_xy(1, 1), Border(self.0) }.fill_xy()
     }
 }
+
 pub trait BorderStyle: Send + Sync + Copy {
     const NW: &'static str = "";
     const N:  &'static str = "";
@@ -156,6 +165,7 @@ pub trait BorderStyle: Send + Sync + Copy {
     #[inline] fn style_vertical   (&self) -> Option<Style> { self.style() }
     #[inline] fn style_corners    (&self) -> Option<Style> { self.style() }
 }
+
 macro_rules! border {
     ($($T:ident {
         $nw:literal $n:literal $ne:literal $w:literal $e:literal $sw:literal $s:literal $se:literal
@@ -174,13 +184,13 @@ macro_rules! border {
         }
         #[derive(Copy, Clone)]
         pub struct $T(pub Style);
-        impl Render for $T {
-            type Engine = Tui;
+        impl Render<Tui> for $T {
             fn min_size (&self, _: [u16;2]) -> Perhaps<[u16;2]> { Ok(Some([0,0])) }
             fn render (&self, to: &mut TuiOutput) -> Usually<()> { self.draw(to) }
         }
     )+}
 }
+
 border! {
     Square {
         "┌" "─" "┐"
@@ -238,6 +248,7 @@ border! {
         "🭼" "" "🭿" fn style (&self) -> Option<Style> { Some(self.0) }
     }
 }
+
 pub const CORNERS: CornersTall = CornersTall(Style {
     fg:              Some(Color::Rgb(96, 255, 32)),
     bg:              None,

crates/tek_tui/src/tui_view_arranger.rs

@@ -1,9 +1,8 @@
 use crate::*;
 
 /// Layout for standalone arranger app.
-impl Content for ArrangerTui {
-    type Engine = Tui;
-    fn content (&self) -> impl Render<Engine = Tui> {
+impl Content<Tui> for ArrangerTui {
+    fn content (&self) -> impl Render<Tui> {
         let arranger_focused = self.arranger_focused();
         Split::down(
             1,
@@ -90,7 +89,7 @@ fn track_widths (tracks: &[ArrangerTrack]) -> Vec<(usize, usize)> {
 pub fn arranger_content_vertical (
     view: &ArrangerTui,
     factor: usize
-) -> impl Render<Engine = Tui> + use<'_> {
+) -> impl Render<Tui> + use<'_> {
     let timebase  = view.clock().timebase();
     let current   = &view.clock().playhead;
     let tracks    = view.tracks();
@@ -276,7 +275,7 @@ pub fn arranger_content_vertical (
 
 pub fn arranger_content_horizontal (
     view: &ArrangerTui,
-) -> impl Render<Engine = Tui> + use<'_> {
+) -> impl Render<Tui> + use<'_> {
     let focused = view.arranger_focused();
     let _tracks = view.tracks();
     lay!(

crates/tek_tui/src/tui_view_file_browser.rs

@@ -1,8 +1,7 @@
 use crate::*;
 
-impl Content for FileBrowser {
-    type Engine = Tui;
-    fn content (&self) -> impl Render<Engine = Tui> {
+impl Content<Tui> for FileBrowser {
+    fn content (&self) -> impl Render<Tui> {
         Stack::down(|add|{
             let mut i = 0;
             for (_, name) in self.dirs.iter() {

crates/tek_tui/src/tui_view_phrase_editor.rs

@@ -52,9 +52,8 @@ impl<'a, T: HasEditor> From<&'a T> for PhraseView<'a> {
     }
 }
 
-impl<'a> Content for PhraseView<'a> {
-    type Engine = Tui;
-    fn content (&self) -> impl Render<Engine = Tui> {
+impl<'a> Content<Tui> for PhraseView<'a> {
+    fn content (&self) -> impl Render<Tui> {
         let Self {
             focused, entered, size,
             phrase, view_mode, buffer,

crates/tek_tui/src/tui_view_phrase_length.rs

@@ -1,8 +1,7 @@
 use crate::*;
 
-impl Content for PhraseLength {
-    type Engine = Tui;
-    fn content (&self) -> impl Render<Engine = Tui> {
+impl Content<Tui> for PhraseLength {
+    fn content (&self) -> impl Render<Tui> {
         Layers::new(move|add|{
             match self.focus {
                 None => add(&row!(

crates/tek_tui/src/tui_view_phrase_list.rs

@@ -23,9 +23,8 @@ impl<'a, T: HasPhraseList> From<&'a T> for PhraseListView<'a> {
 }
 
 // TODO: Display phrases always in order of appearance
-impl<'a> Content for PhraseListView<'a> {
-    type Engine = Tui;
-    fn content (&self) -> impl Render<Engine = Tui> {
+impl<'a> Content<Tui> for PhraseListView<'a> {
+    fn content (&self) -> impl Render<Tui> {
         let Self { title, focused, entered, phrases, index, mode } = self;
         let content = Stack::down(move|add|match mode {
             Some(PhrasesMode::Import(_, ref browser)) => {

crates/tek_tui/src/tui_view_phrase_selector.rs

@@ -35,9 +35,8 @@ impl<'a> PhraseSelector<'a> {
 }
 
 // TODO: Display phrases always in order of appearance
-impl<'a> Content for PhraseSelector<'a> {
-    type Engine = Tui;
-    fn content (&self) -> impl Render<Engine = Tui> {
+impl<'a> Content<Tui> for PhraseSelector<'a> {
+    fn content (&self) -> impl Render<Tui> {
         let Self { title, phrase, focused, entered } = self;
         let content = Layers::new(move|add|{
             if let Some((instant, Some(phrase))) = phrase {

crates/tek_tui/src/tui_view_sequencer.rs

@@ -1,9 +1,8 @@
             //]))
 use crate::*;
 
-impl Content for SequencerTui {
-    type Engine = Tui;
-    fn content (&self) -> impl Render<Engine = Tui> {
+impl Content<Tui> for SequencerTui {
+    fn content (&self) -> impl Render<Tui> {
         let play = PhraseSelector::play_phrase(
             &self.player,
             self.focused() == SequencerFocus::PhrasePlay,
@@ -33,9 +32,8 @@ impl Content for SequencerTui {
     }
 }
 
-impl Content for SequencerStatusBar {
-    type Engine = Tui;
-    fn content (&self) -> impl Render<Engine = Tui> {
+impl Content<Tui> for SequencerStatusBar {
+    fn content (&self) -> impl Render<Tui> {
         let orange = Color::Rgb(255,128,0);
         let yellow = Color::Rgb(255,255,0);
         let black  = Color::Rgb(0,0,0);

crates/tek_tui/src/tui_view_transport.rs

@@ -1,7 +1,6 @@
 use crate::*;
 
-impl Render for TransportTui {
-    type Engine = Tui;
+impl Render<Tui> for TransportTui {
     fn min_size (&self, to: [u16;2]) -> Perhaps<[u16;2]> {
         TransportView::from(self).min_size(to)
     }
@@ -21,9 +20,8 @@ pub struct TransportView {
     pub(crate) msu:      String,
 }
 
-impl Content for TransportView {
-    type Engine = Tui;
-    fn content (&self) -> impl Render<Engine = Tui> {
+impl Content<Tui> for TransportView {
+    fn content (&self) -> impl Render<Tui> {
         let Self { state, selected, focused, bpm, sync, quant, beat, msu, } = self;
         Stack::down(move|add|{
             add(&row!("│World    ", row!(
@@ -134,9 +132,8 @@ impl From<&ArrangerTui> for Option<TransportFocus> {
 
 struct Field(&'static str, String);
 
-impl Content for Field {
-    type Engine = Tui;
-    fn content (&self) -> impl Render<Engine = Tui> {
+impl Content<Tui> for Field {
+    fn content (&self) -> impl Render<Tui> {
         row!(
             "│",
             TuiStyle::bold(self.0, true),