implementing Fixed constraint

crates/tek_core/src/engine.rs

@@ -385,6 +385,26 @@ impl<T> Align<T> {
     }
 }
 
+/// Enforce fixed size of drawing area
+pub enum Fixed<U: Number, T> {
+    /// Enforce fixed width
+    W(U, T),
+    /// Enforce fixed height
+    H(U, T),
+    /// Enforce fixed width and height
+    WH(U, U, T),
+}
+
+impl<N: Number, T> Fixed<N, T> {
+    pub fn inner (&self) -> &T {
+        match self {
+            Self::W(_, inner) => inner,
+            Self::H(_, inner) => inner,
+            Self::WH(_, _, inner) => inner,
+        }
+    }
+}
+
 /// Enforce minimum size of drawing area
 pub enum Min<U: Number, T> {
     /// Enforce minimum width

crates/tek_core/src/tui.rs

@@ -452,6 +452,31 @@ pub const NOT_DIM_BOLD: Style = Style {
     sub_modifier:    Modifier::DIM,
 };
 
+impl<T: Widget<Engine = Tui>> Widget for Fixed<u16, T> {
+    type Engine = Tui;
+    fn layout (&self, area: [u16;4]) -> Perhaps<[u16;4]> {
+        Ok(match self {
+            Self::W(w, item) => if area.w() < *w { None } else {
+                item.layout(area)?.map(|[x, y, _, h]|[x, y, *w, h])
+            },
+            Self::H(h, item) => if area.w() < *h { None } else {
+                item.layout(area)?.map(|[x, y, w, _]|[x, y, w, *h])
+            },
+            Self::WH(w, h, item) => if area.w() < *w || area.h() < *h { None } else {
+                item.layout(area)?.map(|[x, y, _, _]|[x, y, *w, *h])
+            }
+        })
+    }
+    fn render (&self, to: &mut Tui) -> Perhaps<[u16;4]> {
+        // 🡘  🡙 ←🡙→
+        if let Some(area) = self.layout(to.area())? {
+            to.render_in(area, self.inner())
+        } else {
+            Ok(None)
+        }
+    }
+}
+
 impl<F> Widget for Split<Tui, F>
 where
     F: Send + Sync + Fn(&mut dyn FnMut(&dyn Widget<Engine = Tui>)->Usually<()>)->Usually<()>

crates/tek_sequencer/src/arranger.rs

@@ -379,7 +379,7 @@ impl<'a, 'b> Content for ArrangerViewVertical<'a, 'b, Tui> {
             add(&ColumnSeparators(offset, cols))?;
             add(&RowSeparators(rows))?;
             add(&CursorFocus(state.selected, offset, cols, rows))?;
-            add(&Split::right(|add|{
+            add(&Split::down(|add|{
                 add(&TracksHeader(offset, cols, tracks))?;
                 add(&SceneRows(offset, cols, rows, tracks, scenes))
             }))
@@ -496,7 +496,9 @@ impl<'a> Widget for CursorFocus<'a> {
     }
 }
 
-struct TracksHeader<'a>(u16, &'a[(usize, usize)], &'a [Sequencer<Tui>]);
+struct TracksHeader<'a>(
+    u16, &'a[(usize, usize)], &'a [Sequencer<Tui>]
+);
 
 impl<'a> Content for TracksHeader<'a> {
     type Engine = Tui;
@@ -514,22 +516,28 @@ impl<'a> Content for TracksHeader<'a> {
     }
 }
 
-struct SceneRows<'a>(u16, &'a[(usize, usize)], &'a[(usize, usize)], &'a[Sequencer<Tui>], &'a[Scene]);
+struct SceneRows<'a>(
+    u16, &'a[(usize, usize)], &'a[(usize, usize)], &'a[Sequencer<Tui>], &'a[Scene]
+);
 
 impl<'a> Content for SceneRows<'a> {
     type Engine = Tui;
     fn content (&self) -> impl Widget<Engine = Tui> {
         let Self(offset, columns, rows, tracks, scenes) = *self;
         Split::down(move |add| {
-            for (scene, (_pulses, _)) in scenes.iter().zip(rows) {
-                add(&SceneRow(tracks, scene, columns, offset))?;
+            for (scene, (pulses, _)) in scenes.iter().zip(rows) {
+                add(&Fixed::H(1.max((pulses / 96) as u16), SceneRow(
+                    tracks, scene, columns, offset
+                )))?;
             }
             Ok(())
         })
     }
 }
 
-struct SceneRow<'a>(&'a[Sequencer<Tui>], &'a Scene, &'a[(usize, usize)], u16);
+struct SceneRow<'a>(
+    &'a[Sequencer<Tui>], &'a Scene, &'a[(usize, usize)], u16
+);
 
 impl<'a> Content for SceneRow<'a> {
     type Engine = Tui;
@@ -538,8 +546,10 @@ impl<'a> Content for SceneRow<'a> {
         let playing = scene.is_playing(tracks);
         Split::right(move |add| {
             add(&Layers::new(|add|{
+                add(&Split::right(|add|{
                     add(&if playing { "▶" } else { " " })?;
-                add(&scene.name.read().unwrap().as_str())?;
+                    add(&scene.name.read().unwrap().as_str())
+                }))?;
                 add(&FillBg(COLOR_BG1))
             }))?;
             for (track, (_w, _x)) in columns.iter().enumerate() {

crates/tek_test/src/main.rs

@@ -44,11 +44,12 @@ impl Content for Demo<Tui> {
                     add(&Align::Center("12345"))?;
                     add(&Align::Center("FOO"))
                 }))?;
-                add(&Layers::new(|add|{
+                add(&Fixed::H(10, Layers::new(|add|{
                     add(&FillBg(Color::Rgb(0,0,128)))?;
                     add(&Align::Center("1234567"))?;
                     add(&Align::Center("BAR"))
-                }))
+                })))?;
+                Ok(())
             }))
         }))
     }