From 14d619a10a99b73f883b80f78fe3aa8b522a3d1c Mon Sep 17 00:00:00 2001
From: unspeaker <hora.nqma@protonmail.com>
Date: Thu, 5 Sep 2024 13:28:05 +0300
Subject: [PATCH] wip: tui cleanup

---
 crates/tek_core/src/component.rs              |   7 +
 .../tek_core/src/{ => component}/collect.rs   |   5 +
 .../layered.rs}                               |  12 +-
 crates/tek_core/src/component/offset.rs       |  38 +++
 crates/tek_core/src/component/split.rs        |  50 ++++
 crates/tek_core/src/lib.rs                    |   6 +-
 crates/tek_core/src/render_buffer.rs          |  25 --
 crates/tek_core/src/render_split.rs           |  96 -------
 .../tek_core/src/{render_axis.rs => space.rs} |   1 +
 crates/tek_core/src/tui.rs                    | 264 +++++++++++-------
 crates/tek_mixer/src/mixer.rs                 |  22 +-
 crates/tek_mixer/src/plugin.rs                |  15 +-
 crates/tek_mixer/src/sampler.rs               |  18 +-
 crates/tek_mixer/src/track.rs                 |  16 +-
 crates/tek_mixer/src/track_view.rs            |  19 +-
 crates/tek_sequencer/src/arranger.rs          |  10 +-
 crates/tek_sequencer/src/arranger_view_v.rs   |  47 ++--
 17 files changed, 345 insertions(+), 306 deletions(-)
 rename crates/tek_core/src/{ => component}/collect.rs (99%)
 rename crates/tek_core/src/{render_layered.rs => component/layered.rs} (58%)
 create mode 100644 crates/tek_core/src/component/offset.rs
 create mode 100644 crates/tek_core/src/component/split.rs
 delete mode 100644 crates/tek_core/src/render_buffer.rs
 delete mode 100644 crates/tek_core/src/render_split.rs
 rename crates/tek_core/src/{render_axis.rs => space.rs} (99%)

diff --git a/crates/tek_core/src/component.rs b/crates/tek_core/src/component.rs
index 952a4d90..c9bf9e19 100644
--- a/crates/tek_core/src/component.rs
+++ b/crates/tek_core/src/component.rs
@@ -5,3 +5,10 @@ pub trait Component<E: Engine>: Render<E> + Handle<E> {}
 
 /// Everything that implements [Render] and [Handle] is a [Component].
 impl<E: Engine, C: Render<E> + Handle<E>> Component<E> for C {}
+
+submod! {
+    collect
+    layered
+    offset
+    split
+}
diff --git a/crates/tek_core/src/collect.rs b/crates/tek_core/src/component/collect.rs
similarity index 99%
rename from crates/tek_core/src/collect.rs
rename to crates/tek_core/src/component/collect.rs
index df77d585..05ef4971 100644
--- a/crates/tek_core/src/collect.rs
+++ b/crates/tek_core/src/component/collect.rs
@@ -4,6 +4,7 @@ pub enum Collected<'a, E: Engine> {
     Box(Box<dyn Render<E> + 'a>),
     Ref(&'a (dyn Render<E> + 'a)),
 }
+
 impl<'a, E: Engine> Render<E> for Collected<'a, E> {
     fn render (&self, to: &mut E) -> Perhaps<E::Rendered> {
         match self {
@@ -12,14 +13,17 @@ impl<'a, E: Engine> Render<E> for Collected<'a, E> {
         }
     }
 }
+
 pub struct Collection<'a, E: Engine>(
     pub Vec<Collected<'a, E>>
 );
+
 impl<'a, E: Engine> Collection<'a, E> {
     pub fn new () -> Self {
         Self(vec![])
     }
 }
+
 pub trait Collect<'a, E: Engine> {
     fn add_box (self, item: Box<dyn Render<E> + 'a>) -> Self;
     fn add_ref (self, item: &'a dyn Render<E>) -> Self;
@@ -29,6 +33,7 @@ pub trait Collect<'a, E: Engine> {
         self.add_box(Box::new(item))
     }
 }
+
 impl<'a, E: Engine> Collect<'a, E> for Collection<'a, E> {
     fn add_box (mut self, item: Box<dyn Render<E> + 'a>) -> Self {
         self.0.push(Collected::Box(item));
diff --git a/crates/tek_core/src/render_layered.rs b/crates/tek_core/src/component/layered.rs
similarity index 58%
rename from crates/tek_core/src/render_layered.rs
rename to crates/tek_core/src/component/layered.rs
index 92fe0546..b892ec8b 100644
--- a/crates/tek_core/src/render_layered.rs
+++ b/crates/tek_core/src/component/layered.rs
@@ -1,6 +1,6 @@
 use crate::*;
 
-pub struct Layered<'a, E: Engine>(Collection<'a, E>);
+pub struct Layered<'a, E: Engine>(pub Collection<'a, E>);
 
 impl<'a, E: Engine> Layered<'a, E> {
     pub fn new () -> Self {
@@ -18,13 +18,3 @@ impl<'a, E: Engine> Collect<'a, E> for Layered<'a, E> {
         self
     }
 }
-
-impl<'a> Render<Tui> for Layered<'a, Tui> {
-    fn render (&self, to: &mut Tui) -> Perhaps<Rect> {
-        let area = to.area();
-        for layer in self.0.0.iter() {
-            layer.render(to)?;
-        }
-        Ok(Some(area))
-    }
-}
diff --git a/crates/tek_core/src/component/offset.rs b/crates/tek_core/src/component/offset.rs
new file mode 100644
index 00000000..aeaa69a1
--- /dev/null
+++ b/crates/tek_core/src/component/offset.rs
@@ -0,0 +1,38 @@
+use crate::*;
+use std::ops::Add;
+
+pub struct Offset<N>(pub N, pub N);
+
+impl<N: Copy> From<N> for Offset<N> {
+    fn from (n: N) -> Self {
+        Self(n, n)
+    }
+}
+
+pub struct Inset<N>(pub N, pub N, pub N, pub N);
+
+impl<N: Copy> From<N> for Inset<N> {
+    fn from (n: N) -> Self {
+        Self(n, n, n, n)
+    }
+}
+
+impl<N: Copy> From<(N, N)> for Inset<N> {
+    fn from ((n1, n2): (N, N)) -> Self {
+        Self(n1, n2, n1, n2)
+    }
+}
+
+pub struct Outset<N>(pub N, pub N, pub N, pub N);
+
+impl<N: Copy> From<N> for Outset<N> {
+    fn from (n: N) -> Self {
+        Self(n, n, n, n)
+    }
+}
+
+impl<N: Copy> From<(N, N)> for Outset<N> {
+    fn from ((n1, n2): (N, N)) -> Self {
+        Self(n1, n2, n1, n2)
+    }
+}
diff --git a/crates/tek_core/src/component/split.rs b/crates/tek_core/src/component/split.rs
new file mode 100644
index 00000000..8cf2f667
--- /dev/null
+++ b/crates/tek_core/src/component/split.rs
@@ -0,0 +1,50 @@
+use crate::*;
+
+#[derive(Copy, Clone)]
+pub enum Direction { Up, Down, Left, Right }
+
+impl Direction {
+    pub fn is_down (&self) -> bool {
+        match self { Self::Down => true, _ => false }
+    }
+    pub fn is_right (&self) -> bool {
+        match self { Self::Right => true, _ => false }
+    }
+}
+
+pub struct Split<'a, E: Engine> {
+    items:     Collection<'a, E>,
+    direction: Direction,
+    focus:     Option<usize>
+}
+
+impl<'a, E: Engine> Split<'a, E> {
+    pub fn new (direction: Direction) -> Self {
+        Self {
+            items: Collection::new(),
+            direction,
+            focus: None
+        }
+    }
+    pub fn down () -> Self {
+        Self::new(Direction::Down)
+    }
+    pub fn right () -> Self {
+        Self::new(Direction::Right)
+    }
+    pub fn focus (mut self, focus: Option<usize>) -> Self {
+        self.focus = focus;
+        self
+    }
+}
+
+impl<'a, E: Engine> Collect<'a, E> for Split<'a, E> {
+    fn add_box (mut self, item: Box<dyn Render<E> + 'a>) -> Self {
+        self.items = self.items.add_box(item);
+        self
+    }
+    fn add_ref (mut self, item: &'a dyn Render<E>) -> Self {
+        self.items = self.items.add_ref(item);
+        self
+    }
+}
diff --git a/crates/tek_core/src/lib.rs b/crates/tek_core/src/lib.rs
index 83f73d12..74958ee6 100644
--- a/crates/tek_core/src/lib.rs
+++ b/crates/tek_core/src/lib.rs
@@ -27,7 +27,6 @@ use better_panic::{Settings, Verbosity};
 }
 
 submod! {
-    collect
     component
     edn
     engine
@@ -40,11 +39,8 @@ submod! {
     jack_event
     jack_ports
     keymap
+    space
     render
-    render_axis
-    render_buffer
-    render_layered
-    render_split
     time
     tui
 }
diff --git a/crates/tek_core/src/render_buffer.rs b/crates/tek_core/src/render_buffer.rs
deleted file mode 100644
index 824d0202..00000000
--- a/crates/tek_core/src/render_buffer.rs
+++ /dev/null
@@ -1,25 +0,0 @@
-use crate::*;
-
-#[derive(Default)]
-pub struct BigBuffer {
-    pub width:   usize,
-    pub height:  usize,
-    pub content: Vec<Cell>
-}
-
-impl BigBuffer {
-    pub fn new (width: usize, height: usize) -> Self {
-        Self { width, height, content: vec![Cell::default(); width*height] }
-    }
-    pub fn get (&self, x: usize, y: usize) -> Option<&Cell> {
-        let i = self.index_of(x, y);
-        self.content.get(i)
-    }
-    pub fn get_mut (&mut self, x: usize, y: usize) -> Option<&mut Cell> {
-        let i = self.index_of(x, y);
-        self.content.get_mut(i)
-    }
-    pub fn index_of (&self, x: usize, y: usize) -> usize {
-        y * self.width + x
-    }
-}
diff --git a/crates/tek_core/src/render_split.rs b/crates/tek_core/src/render_split.rs
deleted file mode 100644
index b7e07821..00000000
--- a/crates/tek_core/src/render_split.rs
+++ /dev/null
@@ -1,96 +0,0 @@
-use crate::*;
-
-#[derive(Copy, Clone)]
-pub enum Direction {
-    Up,
-    Down,
-    Left,
-    Right
-}
-
-impl Direction {
-    pub fn is_down (&self) -> bool {
-        match self { Self::Down => true, _ => false }
-    }
-    pub fn is_right (&self) -> bool {
-        match self { Self::Right => true, _ => false }
-    }
-}
-
-pub struct Split<'a, E: Engine> {
-    items:     Collection<'a, E>,
-    direction: Direction,
-    focus:     Option<usize>
-}
-
-impl<'a, E: Engine> Split<'a, E> {
-    pub fn new (direction: Direction) -> Self {
-        Self {
-            items: Collection::new(),
-            direction,
-            focus: None
-        }
-    }
-    pub fn down () -> Self {
-        Self::new(Direction::Down)
-    }
-    pub fn right () -> Self {
-        Self::new(Direction::Right)
-    }
-    pub fn focus (mut self, focus: Option<usize>) -> Self {
-        self.focus = focus;
-        self
-    }
-}
-
-impl<'a, E: Engine> Collect<'a, E> for Split<'a, E> {
-    fn add_box (mut self, item: Box<dyn Render<E> + 'a>) -> Self {
-        self.items = self.items.add_box(item);
-        self
-    }
-    fn add_ref (mut self, item: &'a dyn Render<E>) -> Self {
-        self.items = self.items.add_ref(item);
-        self
-    }
-}
-
-impl<'a> Render<Tui> for Split<'a, Tui> {
-    fn render (&self, to: &mut Tui) -> Perhaps<Rect> {
-        Ok(None)//Rect::default())//Some(self.render_areas(to)?.0))
-    }
-}
-
-impl<'a> Split<'a, Tui> {
-    pub fn render_areas (&self, to: &mut Tui) -> Usually<(Rect, Vec<Rect>)> {
-        Ok((Rect::default(), vec![]))
-        //let Rect { mut x, mut y, mut width, mut height } = to.area;
-        //let TuiOutput { buffer, area } = to;
-        //let mut areas = vec![];
-        //for (index, item) in self.items.0.iter().enumerate() {
-            //if width == 0 || height == 0 {
-                //break
-            //}
-            //if let Some(result) = item.render(&mut TuiOutput {
-                //buffer: to.buffer,
-                //area: Rect { x, y, width, height }
-            //})? {
-                //match self.direction {
-                    //Direction::Down => {
-                        //y += result.height;
-                        //height = height.saturating_sub(result.height);
-                    //},
-                    //Direction::Right => {
-                        //x += result.width;
-                        //width = width.saturating_sub(result.width);
-                    //},
-                    //_ => unimplemented!()
-                //};
-                //areas.push(result);
-                //if self.focus == Some(index) {
-                    //Corners(Style::default().green().not_dim()).draw(to.buffer, result)?;
-                //}
-            //}
-        //}
-        //Ok((to.area, areas))
-    }
-}
diff --git a/crates/tek_core/src/render_axis.rs b/crates/tek_core/src/space.rs
similarity index 99%
rename from crates/tek_core/src/render_axis.rs
rename to crates/tek_core/src/space.rs
index 0a0c5055..920749b9 100644
--- a/crates/tek_core/src/render_axis.rs
+++ b/crates/tek_core/src/space.rs
@@ -31,3 +31,4 @@ impl<T: Copy> ScaledAxis<T> {
         self.scale = cb(self.scale)
     }
 }
+
diff --git a/crates/tek_core/src/tui.rs b/crates/tek_core/src/tui.rs
index a5fcc4fb..af16b1db 100644
--- a/crates/tek_core/src/tui.rs
+++ b/crates/tek_core/src/tui.rs
@@ -1,5 +1,4 @@
 use crate::*;
-
 pub(crate) use ratatui::buffer::Cell;
 pub(crate) use crossterm::{ExecutableCommand};
 pub use crossterm::event::{Event, KeyEvent, KeyCode, KeyModifiers};
@@ -11,7 +10,6 @@ use crossterm::terminal::{
     EnterAlternateScreen, LeaveAlternateScreen,
     enable_raw_mode, disable_raw_mode
 };
-
 pub struct Tui {
     exited:  Arc<AtomicBool>,
     buffer:  usize,
@@ -28,11 +26,18 @@ impl Engine for Tui {
         self.exited.fetch_and(true, Ordering::Relaxed)
     }
     fn setup (&mut self) -> Usually<()> {
-        panic_hook_setup();
-        terminal_setup()
+        let better_panic_handler = Settings::auto().verbosity(Verbosity::Full).create_panic_handler();
+        std::panic::set_hook(Box::new(move |info: &std::panic::PanicInfo|{
+            stdout().execute(LeaveAlternateScreen).unwrap();
+            disable_raw_mode().unwrap();
+            better_panic_handler(info);
+        }));
+        stdout().execute(EnterAlternateScreen)?;
+        enable_raw_mode().map_err(Into::into)
     }
     fn teardown (&mut self) -> Usually<()> {
-        terminal_teardown()
+        stdout().execute(LeaveAlternateScreen)?;
+        disable_raw_mode().map_err(Into::into)
     }
     fn handle (&self, state: &mut impl Handle<Self>) -> Usually<()> {
         if ::crossterm::event::poll(self.poll).is_ok() {
@@ -49,6 +54,7 @@ impl Engine for Tui {
     }
     fn render (&mut self, state: &impl Render<Self>) -> Usually<()> {
         state.render(self).expect("render failed");
+        self.flip();
         Ok(())
     }
 }
@@ -96,10 +102,6 @@ impl Tui {
         main_thread.join().expect("main thread failed");
         Ok(state)
     }
-    pub fn target <'a> (&'a mut self) -> impl TuiTarget + 'a {
-        let area = self.area();
-        (self.buffer(), area)
-    }
     fn flip (&mut self) {
         let previous_buffer = &self.buffers[1 - self.buffer];
         let current_buffer  = &self.buffers[self.buffer];
@@ -108,6 +110,24 @@ impl Tui {
         self.buffers[1 - self.buffer].reset();
         self.buffer = 1 - self.buffer;
     }
+    pub fn area (&self) -> Rect {
+        self.area
+    }
+    pub fn buffer (&mut self) -> &mut Buffer {
+        &mut self.buffers[self.buffer]
+    }
+    pub fn buffer_update (&mut self, area: Rect, callback: &impl Fn(&mut Cell, u16, u16)) {
+        let buf = self.buffer();
+        for row in 0..area.height {
+            let y = area.y + row;
+            for col in 0..area.width {
+                let x = area.x + col;
+                if x < buf.area.width && y < buf.area.height {
+                    callback(buf.get_mut(x, y), col, row);
+                }
+            }
+        }
+    }
     pub fn fill_bg (&mut self, area: Rect, color: Color) {
         self.buffer_update(area, &|cell,_,_|{cell.set_bg(color);})
     }
@@ -130,80 +150,24 @@ impl Tui {
             cell.modifier = ratatui::style::Modifier::DIM;
         }
     }
-    pub fn buffer_update (&mut self, area: Rect, callback: &impl Fn(&mut Cell, u16, u16)) {
+    pub fn blit (
+        &mut self, text: &impl AsRef<str>, x: u16, y: u16, style: Option<Style>
+    ) -> Perhaps<Rect> {
+        let text = text.as_ref();
         let buf = self.buffer();
-        for row in 0..area.height {
-            let y = area.y + row;
-            for col in 0..area.width {
-                let x = area.x + col;
-                if x < buf.area.width && y < buf.area.height {
-                    callback(buf.get_mut(x, y), col, row);
-                }
-            }
-        }
-    }
-}
-
-pub trait TuiTarget {
-    fn area (&self) -> Rect;
-    fn buffer (&mut self) -> &mut Buffer;
-}
-
-impl TuiTarget for Tui {
-    fn area (&self) -> Rect {
-        self.area
-    }
-    fn buffer (&mut self) -> &mut Buffer {
-        &mut self.buffers[self.buffer]
-    }
-}
-
-impl<'a> TuiTarget for (&'a mut Buffer, Rect) {
-    fn area (&self) -> Rect {
-        self.1
-    }
-    fn buffer (&mut self) -> &mut Buffer {
-        self.0
-    }
-}
-
-/// Set up panic hook
-pub fn panic_hook_setup () {
-    let better_panic_handler = Settings::auto().verbosity(Verbosity::Full).create_panic_handler();
-    std::panic::set_hook(Box::new(move |info: &std::panic::PanicInfo|{
-        stdout().execute(LeaveAlternateScreen).unwrap();
-        disable_raw_mode().unwrap();
-        better_panic_handler(info);
-    }));
-}
-
-/// Set up terminal
-pub fn terminal_setup () -> Usually<()> {
-    stdout().execute(EnterAlternateScreen)?;
-    enable_raw_mode()?;
-    Ok(())
-}
-
-/// Cleanup
-pub fn terminal_teardown () -> Usually<()> {
-    stdout().execute(LeaveAlternateScreen)?;
-    disable_raw_mode()?;
-    Ok(())
-}
-
-/// A simpler analog to [Render].
-pub trait Blit {
-    // Render something to X, Y coordinates in a buffer, ignoring width/height.
-    fn blit (&self, buf: &mut Buffer, x: u16, y: u16, style: Option<Style>) -> Perhaps<Rect>;
-}
-
-/// Text can be rendered.
-impl<T: AsRef<str>> Blit for T {
-    fn blit (&self, buf: &mut Buffer, x: u16, y: u16, style: Option<Style>) -> Perhaps<Rect> {
         if x < buf.area.width && y < buf.area.height {
-            buf.set_string(x, y, self.as_ref(), style.unwrap_or(Style::default()));
+            buf.set_string(x, y, text, style.unwrap_or(Style::default()));
         }
-        Ok(Some(Rect { x, y, width: self.as_ref().len() as u16, height: 1 }))
+        Ok(Some(Rect { x, y, width: text.len() as u16, height: 1 }))
+    }
+    pub fn alter_area (
+        &mut self, alter: impl Fn(u16, u16, u16, u16)->(u16, u16, u16, u16)
+    ) -> &mut Self {
+        let (x, y, width, height) = alter(
+            self.area.x, self.area.y, self.area.width, self.area.height
+        );
+        self.area = Rect { x, y, width, height };
+        self
     }
 }
 
@@ -264,28 +228,28 @@ pub trait BorderStyle {
         let buf = to.buffer();
         let style = style.or_else(||self.style_horizontal());
         for x in area.x..(area.x+area.width).saturating_sub(1) {
-            self.draw_north(buf, x, area.y, style)?;
-            self.draw_south(buf, x, (area.y + area.height).saturating_sub(1), style)?;
+            self.draw_north(to, x, area.y, style)?;
+            self.draw_south(to, x, (area.y + area.height).saturating_sub(1), style)?;
         }
         Ok(area)
     }
     #[inline]
-    fn draw_north (&self, buf: &mut Buffer, x: u16, y: u16, style: Option<Style>) -> Perhaps<Rect> {
-        Self::N.blit(buf, x, y, style)
+    fn draw_north (&self, to: &mut Tui, x: u16, y: u16, style: Option<Style>) -> Perhaps<Rect> {
+        to.blit(&Self::N, x, y, style)
     }
     #[inline]
-    fn draw_south (&self, buf: &mut Buffer, x: u16, y: u16, style: Option<Style>) -> Perhaps<Rect> {
-        Self::S.blit(buf, x, y, style)
+    fn draw_south (&self, to: &mut Tui, x: u16, y: u16, style: Option<Style>) -> Perhaps<Rect> {
+        to.blit(&Self::S, x, y, style)
     }
 
     #[inline]
     fn draw_vertical (&self, to: &mut Tui, style: Option<Style>) -> Usually<Rect> {
         let area = to.area();
-        let buf = to.buffer();
         let style = style.or_else(||self.style_vertical());
-        for y in area.y..(area.y+area.height).saturating_sub(1) {
-            Self::W.blit(buf, area.x, y, style)?;
-            Self::E.blit(buf, area.x + area.width - 1, y, style)?;
+        let Rect { x, y, width, height } = area;
+        for y in y..(y+height).saturating_sub(1) {
+            to.blit(&Self::W, x, y, style)?;
+            to.blit(&Self::E, x + width - 1, y, style)?;
         }
         Ok(area)
     }
@@ -293,13 +257,13 @@ pub trait BorderStyle {
     #[inline]
     fn draw_corners (&self, to: &mut Tui, style: Option<Style>) -> Usually<Rect> {
         let area = to.area();
-        let buf = to.buffer();
         let style = style.or_else(||self.style_corners());
-        if area.width > 0 && area.height > 0 {
-            Self::NW.blit(buf, area.x, area.y, style)?;
-            Self::NE.blit(buf, area.x + area.width - 1, area.y, style)?;
-            Self::SW.blit(buf, area.x, area.y + area.height - 1, style)?;
-            Self::SE.blit(buf, area.x + area.width - 1, area.y + area.height - 1, style)?;
+        let Rect { x, y, width, height } = area;
+        if width > 0 && height > 0 {
+            to.blit(&Self::NW, x, y, style)?;
+            to.blit(&Self::NE, x + width - 1, y, style)?;
+            to.blit(&Self::SW, x, y + height - 1, style)?;
+            to.blit(&Self::SE, x + width - 1, y + height - 1, style)?;
         }
         Ok(area)
     }
@@ -556,3 +520,111 @@ pub const NOT_DIM_BOLD: Style = Style {
     add_modifier:    Modifier::BOLD,
     sub_modifier:    Modifier::DIM,
 };
+
+impl<'a> Render<Tui> for Layered<'a, Tui> {
+    fn render (&self, to: &mut Tui) -> Perhaps<Rect> {
+        let area = to.area();
+        for layer in self.0.0.iter() {
+            layer.render(to)?;
+        }
+        Ok(Some(area))
+    }
+}
+
+impl<'a> Render<Tui> for Split<'a, Tui> {
+    fn render (&self, to: &mut Tui) -> Perhaps<Rect> {
+        Ok(Some(self.render_areas(to)?.0))
+    }
+}
+
+impl<'a> Split<'a, Tui> {
+    pub fn render_areas (&self, to: &mut Tui) -> Usually<(Rect, Vec<Rect>)> {
+        Ok((Rect::default(), vec![]))
+        //let Rect { mut x, mut y, mut width, mut height } = to.area;
+        //let TuiOutput { buffer, area } = to;
+        //let mut areas = vec![];
+        //for (index, item) in self.items.0.iter().enumerate() {
+            //if width == 0 || height == 0 {
+                //break
+            //}
+            //if let Some(result) = item.render(&mut TuiOutput {
+                //buffer: to.buffer,
+                //area: Rect { x, y, width, height }
+            //})? {
+                //match self.direction {
+                    //Direction::Down => {
+                        //y += result.height;
+                        //height = height.saturating_sub(result.height);
+                    //},
+                    //Direction::Right => {
+                        //x += result.width;
+                        //width = width.saturating_sub(result.width);
+                    //},
+                    //_ => unimplemented!()
+                //};
+                //areas.push(result);
+                //if self.focus == Some(index) {
+                    //Corners(Style::default().green().not_dim()).draw(to.buffer, result)?;
+                //}
+            //}
+        //}
+        //Ok((to.area, areas))
+    }
+}
+
+#[derive(Default)]
+pub struct BigBuffer {
+    pub width:   usize,
+    pub height:  usize,
+    pub content: Vec<Cell>
+}
+
+impl BigBuffer {
+    pub fn new (width: usize, height: usize) -> Self {
+        Self { width, height, content: vec![Cell::default(); width*height] }
+    }
+    pub fn get (&self, x: usize, y: usize) -> Option<&Cell> {
+        let i = self.index_of(x, y);
+        self.content.get(i)
+    }
+    pub fn get_mut (&mut self, x: usize, y: usize) -> Option<&mut Cell> {
+        let i = self.index_of(x, y);
+        self.content.get_mut(i)
+    }
+    pub fn index_of (&self, x: usize, y: usize) -> usize {
+        y * self.width + x
+    }
+}
+
+impl<R: Render<Tui>> Render<Tui> for (Offset<u16>, R) {
+    fn render (&self, engine: &mut Tui) -> Perhaps<Rect> {
+        self.1.render(engine.alter_area(|x, y, width, height|(
+            x + self.0.0,
+            y + self.0.1,
+            width.saturating_sub(self.0.0),
+            height.saturating_sub(self.0.1),
+        )))
+    }
+}
+
+impl<R: Render<Tui>> Render<Tui> for (Inset<u16>, R) {
+    fn render (&self, engine: &mut Tui) -> Perhaps<Rect> {
+        self.1.render(engine.alter_area(|x, y, width, height|(
+            x + self.0.0,
+            y + self.0.1,
+            width.saturating_sub(self.0.0 + self.0.2),
+            height.saturating_sub(self.0.1 + self.0.3),
+        )))
+    }
+}
+
+impl<R: Render<Tui>> Render<Tui> for (Outset<u16>, R) {
+    fn render (&self, engine: &mut Tui) -> Perhaps<Rect> {
+        self.1.render(engine.alter_area(|x, y, width, height|(
+            x.saturating_sub(self.0.0),
+            y.saturating_sub(self.0.1),
+            width  + self.0.0 + self.0.2,
+            height + self.0.1 + self.0.3,
+        )))
+    }
+}
diff --git a/crates/tek_mixer/src/mixer.rs b/crates/tek_mixer/src/mixer.rs
index e035d0a1..1cac4de6 100644
--- a/crates/tek_mixer/src/mixer.rs
+++ b/crates/tek_mixer/src/mixer.rs
@@ -1,12 +1,12 @@
 use crate::*;
 
-pub struct Mixer<T, U> {
+pub struct Mixer<E> {
     pub name:            String,
-    pub tracks:          Vec<Track<T, U>>,
+    pub tracks:          Vec<Track<E>>,
     pub selected_track:  usize,
     pub selected_column: usize,
 }
-impl<T, U> Mixer<T, U> {
+impl<E> Mixer<E> {
     pub fn new (name: &str) -> Usually<Self> {
         let (client, _status) = Client::new(name, ClientOptions::NO_START_SERVER)?;
         Ok(Self {
@@ -21,12 +21,17 @@ impl<T, U> Mixer<T, U> {
         self.tracks.push(track);
         Ok(self)
     }
-    pub fn track (&self) -> Option<&Track<T, U>> {
+    pub fn track (&self) -> Option<&Track<E>> {
         self.tracks.get(self.selected_track)
     }
 }
-impl<'a> Render<TuiOutput<'a>, Rect> for Mixer<TuiOutput<'a>, Rect> {
-    fn render (&self, to: &mut TuiOutput<'a>) -> Perhaps<Rect> {
+impl<E> Process for Mixer<E> {
+    fn process (&mut self, _: &Client, _: &ProcessScope) -> Control {
+        Control::Continue
+    }
+}
+impl Render<Tui> for Mixer<Tui> {
+    fn render (&self, to: &mut Tui) -> Perhaps<Rect> {
         let mut tracks = Split::right();
         for channel in self.tracks.iter() {
             tracks = tracks.add_ref(channel)
@@ -34,8 +39,3 @@ impl<'a> Render<TuiOutput<'a>, Rect> for Mixer<TuiOutput<'a>, Rect> {
         tracks.render(to)
     }
 }
-impl<T, U> Process for Mixer<T, U> {
-    fn process (&mut self, _: &Client, _: &ProcessScope) -> Control {
-        Control::Continue
-    }
-}
diff --git a/crates/tek_mixer/src/plugin.rs b/crates/tek_mixer/src/plugin.rs
index 5889c145..413246a9 100644
--- a/crates/tek_mixer/src/plugin.rs
+++ b/crates/tek_mixer/src/plugin.rs
@@ -11,9 +11,10 @@ pub struct Plugin {
 }
 handle!(Plugin |self, e| handle_keymap(self, e, KEYMAP_PLUGIN));
 process!(Plugin = Plugin::process);
-impl<'a> Render<TuiOutput<'a>, Rect> for Plugin {
-    fn render (&self, to: &mut TuiOutput<'a>) -> Perhaps<Rect> {
-        let Rect { x, y, height, .. } = to.area;
+impl Render<Tui> for Plugin {
+    fn render (&self, to: &mut Tui) -> Perhaps<Rect> {
+        let area = to.area();
+        let Rect { x, y, height, .. } = area;
         let mut width = 20u16;
         match &self.plugin {
             Some(PluginKind::LV2(LV2Plugin { port_list, instance, .. })) => {
@@ -35,7 +36,7 @@ impl<'a> Render<TuiOutput<'a>, Rect> for Plugin {
                         } else {
                             None
                         } ;
-                        label.blit(to.buffer, x + 2, y + 1 + i as u16 - start as u16, style)?;
+                        label.blit(to.buffer(), x + 2, y + 1 + i as u16 - start as u16, style)?;
                     } else {
                         break
                     }
@@ -43,8 +44,8 @@ impl<'a> Render<TuiOutput<'a>, Rect> for Plugin {
             },
             _ => {}
         };
-        draw_header(self, to.buffer, to.area.x, to.area.y, width)?;
-        Ok(Some(Rect { width, ..to.area }))
+        draw_header(self, to.buffer(), area.x, area.y, width)?;
+        Ok(Some(Rect { width, ..to.area() }))
     }
 }
 
@@ -57,7 +58,7 @@ pub enum PluginKind {
     VST3,
 }
 impl Plugin {
-    pub fn new_lv2 <T, U> (name: &str, path: &str) -> Usually<JackDevice<T, U>> {
+    pub fn new_lv2 <E> (name: &str, path: &str) -> Usually<JackDevice<E>> {
         let plugin = LV2Plugin::new(path)?;
         jack_from_lv2(name, &plugin.plugin)?
             .run(|ports|Box::new(Self {
diff --git a/crates/tek_mixer/src/sampler.rs b/crates/tek_mixer/src/sampler.rs
index 7c9adef1..8e00f3cf 100644
--- a/crates/tek_mixer/src/sampler.rs
+++ b/crates/tek_mixer/src/sampler.rs
@@ -18,12 +18,12 @@ process!(Sampler = Sampler::process);
 
 handle!(Sampler |self, event| handle_keymap(self, event, KEYMAP_SAMPLER));
 
-impl<'a> Render<TuiOutput<'a>, Rect> for Sampler {
-    fn render (&self, to: &mut TuiOutput<'a>) -> Perhaps<Rect> {
-        let Rect { x, y, height, .. } = to.area;
+impl Render<Tui> for Sampler {
+    fn render (&self, to: &mut Tui) -> Perhaps<Rect> {
+        let Rect { x, y, height, .. } = to.area();
         let style = Style::default().gray();
         let title = format!(" {} ({})", self.name, self.voices.read().unwrap().len());
-        title.blit(to.buffer, x+1, y, Some(style.white().bold().not_dim()))?;
+        title.blit(to.buffer(), x+1, y, Some(style.white().bold().not_dim()))?;
         let mut width = title.len() + 2;
         let mut y1 = 1;
         let mut j = 0;
@@ -36,13 +36,13 @@ impl<'a> Render<TuiOutput<'a>, Rect> for Sampler {
             }
             let active = j == self.cursor.0;
             width = width.max(
-                draw_sample(to.buffer, x, y + y1, note, &*sample.read().unwrap(), active)?
+                draw_sample(to.buffer(), x, y + y1, note, &*sample.read().unwrap(), active)?
             );
             y1 = y1 + 1;
             j = j + 1;
         }
         let height = ((2 + y1) as u16).min(height);
-        Ok(Some(Rect { x, y, width: (width as u16).min(to.area.width), height }))
+        Ok(Some(Rect { x, y, width: (width as u16).min(to.area().width), height }))
     }
 }
 
@@ -105,7 +105,7 @@ pub const KEYMAP_SAMPLER: &'static [KeyBinding<Sampler>] = keymap!(Sampler {
 });
 
 impl Sampler {
-    pub fn from_edn <'e, T, U> (args: &[Edn<'e>]) -> Usually<JackDevice<T, U>> {
+    pub fn from_edn <'e, E> (args: &[Edn<'e>]) -> Usually<JackDevice<E>> {
         let mut name = String::new();
         let mut dir  = String::new();
         let mut samples = BTreeMap::new();
@@ -134,9 +134,9 @@ impl Sampler {
         Self::new(&name, Some(samples))
     }
 
-    pub fn new <T, U> (
+    pub fn new <E> (
         name: &str, mapped: Option<BTreeMap<u7, Arc<RwLock<Sample>>>>
-    ) -> Usually<JackDevice<T, U>> {
+    ) -> Usually<JackDevice<E>> {
         Jack::new(name)?
             .midi_in("midi")
             .audio_in("recL")
diff --git a/crates/tek_mixer/src/track.rs b/crates/tek_mixer/src/track.rs
index 417a380f..9c6a239d 100644
--- a/crates/tek_mixer/src/track.rs
+++ b/crates/tek_mixer/src/track.rs
@@ -3,16 +3,16 @@ use tek_core::edn;
 
 /// A sequencer track.
 #[derive(Debug)]
-pub struct Track<T, U> {
+pub struct Track<E: Engine> {
     pub name:    String,
     /// Inputs and outputs of 1st and last device
     pub ports:   JackPorts,
     /// Device chain
-    pub devices: Vec<JackDevice<T, U>>,
+    pub devices: Vec<JackDevice<E>>,
     /// Device selector
     pub device:  usize,
 }
-impl<T, U> Track<T, U> {
+impl<E: Engine> Track<E> {
     pub fn new (name: &str) -> Usually<Self> {
         Ok(Self {
             name:    name.to_string(),
@@ -21,14 +21,14 @@ impl<T, U> Track<T, U> {
             device:  0,
         })
     }
-    fn get_device_mut (&self, i: usize) -> Option<RwLockWriteGuard<Box<dyn Device<T, U>>>> {
+    fn get_device_mut (&self, i: usize) -> Option<RwLockWriteGuard<Box<dyn Device<E>>>> {
         self.devices.get(i).map(|d|d.state.write().unwrap())
     }
-    pub fn device_mut (&self) -> Option<RwLockWriteGuard<Box<dyn Device<T, U>>>> {
+    pub fn device_mut (&self) -> Option<RwLockWriteGuard<Box<dyn Device<E>>>> {
         self.get_device_mut(self.device)
     }
     /// Add a device to the end of the chain.
-    pub fn append_device (&mut self, device: JackDevice<T, U>) -> Usually<&mut JackDevice<T, U>> {
+    pub fn append_device (&mut self, device: JackDevice<E>) -> Usually<&mut JackDevice<E>> {
         self.devices.push(device);
         let index = self.devices.len() - 1;
         Ok(&mut self.devices[index])
@@ -54,7 +54,7 @@ impl<T, U> Track<T, U> {
         let mut _gain = 0.0f64;
         let mut track = Self::new("")?;
         #[allow(unused_mut)]
-        let mut devices: Vec<JackDevice<T, U>> = vec![];
+        let mut devices: Vec<JackDevice<E>> = vec![];
         edn!(edn in args {
             Edn::Map(map) => {
                 if let Some(Edn::Str(n)) = map.get(&Edn::Key(SYM_NAME)) {
@@ -95,7 +95,7 @@ impl<T, U> Track<T, U> {
         }
         Ok(track)
     }
-    pub fn add_device (&mut self, device: JackDevice<T, U>) {
+    pub fn add_device (&mut self, device: JackDevice<E>) {
         self.devices.push(device);
     }
 }
diff --git a/crates/tek_mixer/src/track_view.rs b/crates/tek_mixer/src/track_view.rs
index 7ed8fcec..b2e8aa19 100644
--- a/crates/tek_mixer/src/track_view.rs
+++ b/crates/tek_mixer/src/track_view.rs
@@ -1,7 +1,7 @@
 use crate::*;
 use tek_core::Direction;
 
-impl<'a> Render<TuiOutput<'a>, Rect> for Track<TuiOutput<'a>, Rect> {
+impl<'a> Render<Tui> for Track<Tui> {
     fn render (&self, to: &mut TuiOutput<'a>) -> Perhaps<Rect> {
         TrackView {
             chain:     Some(&self),
@@ -30,15 +30,16 @@ pub struct TrackView<'a, T, U> {
     pub focused:   bool,
     pub entered:   bool,
 }
-impl<'a> Render<TuiOutput<'a>, Rect> for TrackView<'a, TuiOutput<'a>, Rect> {
-    fn render (&self, to: &mut TuiOutput<'a>) -> Perhaps<Rect> {
+impl<'a> Render<Tui> for TrackView<'a, Tui> {
+    fn render (&self, to: &mut Tui) -> Perhaps<Rect> {
+        let mut area = to.area();
         if let Some(chain) = self.chain {
             match self.direction {
-                Direction::Down  => to.area.width = to.area.width.min(40),
-                Direction::Right => to.area.width = to.area.width.min(10),
+                Direction::Down  => area.width = area.width.min(40),
+                Direction::Right => area.width = area.width.min(10),
                 _ => { unimplemented!() },
             }
-            fill_bg(to.buffer, to.area, Nord::bg_lo(self.focused, self.entered));
+            to.fill_bg(to.area(), Nord::bg_lo(self.focused, self.entered));
             let mut split = Split::new(self.direction);
             for device in chain.devices.as_slice().iter() {
                 split = split.add_ref(device);
@@ -49,12 +50,12 @@ impl<'a> Render<TuiOutput<'a>, Rect> for TrackView<'a, TuiOutput<'a>, Rect> {
             }
             Ok(Some(area))
         } else {
-            let Rect { x, y, width, height } = to.area;
+            let Rect { x, y, width, height } = area;
             let label = "No chain selected";
             let x = x + (width - label.len() as u16) / 2;
             let y = y + height / 2;
-            label.blit(to.buffer, x, y, Some(Style::default().dim().bold()))?;
-            Ok(Some(to.area))
+            label.blit(to.buffer(), x, y, Some(Style::default().dim().bold()))?;
+            Ok(Some(area))
         }
     }
 }
diff --git a/crates/tek_sequencer/src/arranger.rs b/crates/tek_sequencer/src/arranger.rs
index 6736ffff..31eac8af 100644
--- a/crates/tek_sequencer/src/arranger.rs
+++ b/crates/tek_sequencer/src/arranger.rs
@@ -2,7 +2,7 @@
 use crate::*;
 
 /// Represents the tracks and scenes of the composition.
-pub struct Arranger<T, U> {
+pub struct Arranger<E: Engine> {
     /// Name of arranger
     pub name:     Arc<RwLock<String>>,
     /// Collection of tracks.
@@ -14,11 +14,11 @@ pub struct Arranger<T, U> {
     /// Display mode of arranger
     pub mode:     ArrangerViewMode,
     /// Slot for modal dialog displayed on top of app.
-    pub modal:    Option<Box<dyn ExitableComponent<T, U>>>,
+    pub modal:    Option<Box<dyn ExitableComponent<E>>>,
     /// Whether the arranger is currently focused
     pub focused:  bool
 }
-impl<T, U> Arranger<T, U> {
+impl<E: Engine> Arranger<E> {
     pub fn new (name: &str) -> Self {
         Self {
             name:     Arc::new(RwLock::new(name.into())),
@@ -100,7 +100,7 @@ impl ArrangerViewMode {
     }
 }
 /// Render arranger to terminal
-impl<'a> Render<TuiOutput<'a>, Rect> for Arranger<TuiOutput<'a>, Rect> {
+impl Render<Tui> for Arranger<Tui> {
     fn render (&'a self, to: &'a mut TuiOutput<'a>) -> Perhaps<Rect> {
         let area = (|to|match self.mode {
             ArrangerViewMode::Horizontal =>
@@ -125,7 +125,7 @@ impl<'a> Render<TuiOutput<'a>, Rect> for Arranger<TuiOutput<'a>, Rect> {
         }))
     }
 }
-impl<'a> Focusable<TuiOutput<'a>, Rect> for Arranger<TuiOutput<'a>, Rect> {
+impl Focusable<Tui> for Arranger<Tui> {
     fn is_focused (&self) -> bool {
         self.focused
     }
diff --git a/crates/tek_sequencer/src/arranger_view_v.rs b/crates/tek_sequencer/src/arranger_view_v.rs
index b5dbe49e..6db5b19a 100644
--- a/crates/tek_sequencer/src/arranger_view_v.rs
+++ b/crates/tek_sequencer/src/arranger_view_v.rs
@@ -2,7 +2,7 @@ use crate::*;
 
 /// Draw arranger with 1 row per scene.
 pub fn draw_compact_1 <'a> (
-    state: &Arranger<TuiOutput<'a>, Rect>, to: &mut TuiOutput<'a>
+    state: &Arranger<Tui>, to: &mut Tui
 ) -> Perhaps<Rect> {
     let track_cols = track_clip_name_lengths(state.tracks.as_slice());
     let scene_rows = (0..=state.scenes.len()).map(|i|(96, 96*i)).collect::<Vec<_>>();
@@ -11,7 +11,7 @@ pub fn draw_compact_1 <'a> (
 
 /// Draw arranger with 2 rows per scene.
 pub fn draw_compact_2 <'a> (
-    state: &Arranger<TuiOutput<'a>, Rect>, to: &mut TuiOutput<'a>
+    state: &Arranger<Tui>, to: &mut Tui
 ) -> Perhaps<Rect> {
     let track_cols = track_clip_name_lengths(state.tracks.as_slice());
     let scene_rows = (0..=state.scenes.len()).map(|i|(192, 192*i)).collect::<Vec<_>>();
@@ -20,7 +20,7 @@ pub fn draw_compact_2 <'a> (
 
 /// Draw arranger with number of rows per scene proportional to duration of scene.
 pub fn draw_expanded <'a> (
-    state: &Arranger<TuiOutput<'a>, Rect>, to: &mut TuiOutput<'a>
+    state: &Arranger<Tui>, to: &mut Tui
 ) -> Perhaps<Rect> {
     let track_cols = track_clip_name_lengths(state.tracks.as_slice());
     let scene_rows = scene_ppqs(state.tracks.as_slice(), state.scenes.as_slice());
@@ -28,8 +28,8 @@ pub fn draw_expanded <'a> (
 }
 
 pub fn draw <'a, 'b> (
-    state: &Arranger<TuiOutput<'a>, Rect>,
-    to:    &mut TuiOutput<'a>,
+    state: &Arranger<Tui>,
+    to:    &mut Tui,
     cols:  &'b [(usize, usize)],
     rows:  &'b [(usize, usize)],
 ) -> Perhaps<Rect> {
@@ -51,8 +51,8 @@ pub fn draw <'a, 'b> (
 
 struct ColumnSeparators<'a>(u16, &'a [(usize, usize)]);
 
-impl<'a> Render<TuiOutput<'a>, Rect> for ColumnSeparators<'a> {
-    fn render (&self, to: &mut TuiOutput<'a>) -> Perhaps<Rect> {
+impl<'a> Render<Tui> for ColumnSeparators<'a> {
+    fn render (&self, to: &mut Tui) -> Perhaps<Rect> {
         let area = to.area;
         let Self(offset, cols) = self;
         let style = Some(Style::default().fg(Nord::SEPARATOR));
@@ -68,8 +68,8 @@ impl<'a> Render<TuiOutput<'a>, Rect> for ColumnSeparators<'a> {
 
 struct RowSeparators<'a>(&'a [(usize, usize)]);
 
-impl<'a> Render<TuiOutput<'a>, Rect> for RowSeparators<'a> {
-    fn render (&self, to: &mut TuiOutput<'a>) -> Perhaps<Rect> {
+impl<'a> Render<Tui> for RowSeparators<'a> {
+    fn render (&self, to: &mut Tui) -> Perhaps<Rect> {
         let mut area = to.area;
         let Self(rows) = self;
         for (_, y) in rows.iter() {
@@ -91,8 +91,8 @@ struct CursorFocus<'a>(
     ArrangerFocus, u16, &'a [(usize, usize)], &'a [(usize, usize)]
 );
 
-impl<'a> Render<TuiOutput<'a>, Rect> for CursorFocus<'a> {
-    fn render (&self, to: &mut TuiOutput<'a>) -> Perhaps<Rect> {
+impl<'a> Render<Tui> for CursorFocus<'a> {
+    fn render (&self, to: &mut Tui) -> Perhaps<Rect> {
         let mut area = to.area;
         let Self(selected, offset, cols, rows) = *self;
         let get_track_area = |t: usize| Rect {
@@ -157,8 +157,8 @@ impl<'a> Render<TuiOutput<'a>, Rect> for CursorFocus<'a> {
 
 struct TracksHeader<'a>(u16, &'a[(usize, usize)], &'a [Sequencer]);
 
-impl<'a> Render<TuiOutput<'a>, Rect> for TracksHeader<'a> {
-    fn render (&self, to: &mut TuiOutput<'a>) -> Perhaps<Rect> {
+impl<'a> Render<Tui> for TracksHeader<'a> {
+    fn render (&self, to: &mut Tui) -> Perhaps<Rect> {
         let mut area = to.area;
         let Self(offset, track_cols, tracks) = *self;
         let Rect { y, width, .. } = area;
@@ -177,8 +177,8 @@ impl<'a> Render<TuiOutput<'a>, Rect> for TracksHeader<'a> {
 
 struct SceneRows<'a>(u16, &'a[(usize, usize)], &'a[(usize, usize)], &'a[Sequencer], &'a[Scene]);
 
-impl<'a> Render<TuiOutput<'a>, Rect> for SceneRows<'a> {
-    fn render (&self, to: &mut TuiOutput<'a>) -> Perhaps<Rect> {
+impl<'a> Render<Tui> for SceneRows<'a> {
+    fn render (&self, to: &mut Tui) -> Perhaps<Rect> {
         let area = to.area;
         let Self(offset, track_cols, scene_rows, tracks, scenes) = *self;
         let black = Some(Style::default().fg(Nord::SEPARATOR));
@@ -208,16 +208,15 @@ impl<'a> Render<TuiOutput<'a>, Rect> for SceneRows<'a> {
 
 struct SceneRow<'a>(&'a[Sequencer], &'a Scene, &'a[(usize, usize)], u16);
 
-impl<'a> Render<TuiOutput<'a>, Rect> for SceneRow<'a> {
-    fn render (&self, to: &mut TuiOutput<'a>) -> Perhaps<Rect> {
-        let mut area = to.area;
+impl<'a> Render<Tui> for SceneRow<'a> {
+    fn render (&self, to: &mut Tui) -> Perhaps<Rect> {
+        let mut area = to.area();
         let Self(tracks, scene, track_cols, offset) = self;
         let Rect { x, y, width, .. } = area;
         let playing = scene.is_playing(tracks);
-        (if playing { "▶" } else { " " }).blit(to.buffer, x, y, None)?;
-        scene.name.read().unwrap().blit(to.buffer, x + 1, y, Some(Style::default().white()))?;
-        fill_bg(to.buffer, Rect { x: x, y, width: offset.saturating_sub(1), height: area.height }, COLOR_BG1);
-
+        (if playing { "▶" } else { " " }).blit(to.buffer(), x, y, None)?;
+        scene.name.read().unwrap().blit(to.buffer(), x + 1, y, Some(Style::default().white()))?;
+        to.fill_bg(Rect { x: x, y, width: offset.saturating_sub(1), height: area.height }, COLOR_BG1);
         for (track, (w, x)) in track_cols.iter().enumerate() {
             let x = *x as u16 + offset;
             if x > width {
@@ -240,8 +239,8 @@ impl<'a> Render<TuiOutput<'a>, Rect> for SceneRow<'a> {
 
 struct SceneClip<'a>(&'a Sequencer, usize);
 
-impl<'a> Render<TuiOutput<'a>, Rect> for SceneClip<'a> {
-    fn render (&self, to: &mut TuiOutput<'a>) -> Perhaps<Rect> {
+impl<'a> Render<Tui> for SceneClip<'a> {
+    fn render (&self, to: &mut Tui) -> Perhaps<Rect> {
         let area = to.area;
         let Self(track, clip) = self;
         let style = Some(Style::default().white());