feat(tracker): implement basic track display

go4k/tracker/layout.go

@@ -2,15 +2,34 @@ package tracker
 
 import (
 	"gioui.org/layout"
-	"gioui.org/op/paint"
 )
 
 func (t *Tracker) Layout(gtx layout.Context) {
-	layout.Stack{Alignment: layout.NW}.Layout(gtx,
-		layout.Expanded(func(gtx layout.Context) layout.Dimensions {
-			paint.Fill(gtx.Ops, black)
-			return layout.Dimensions{Size: gtx.Constraints.Max}
-		}),
+	layout.Flex{Axis: layout.Vertical}.Layout(gtx,
+		layout.Rigid(t.layoutControls),
+		layout.Flexed(1, Lowered(t.layoutTracker)),
+	)
+}
+
+func (t *Tracker) layoutTracker(gtx layout.Context) layout.Dimensions {
+	flexTracks := make([]layout.FlexChild, len(t.song.Tracks))
+	for i, trk := range t.song.Tracks {
+		flexTracks[i] = layout.Rigid(Lowered(t.layoutTrack(
+			t.song.Patterns[trk.Sequence[t.DisplayPattern]],
+			t.ActiveTrack == i,
+			t.CursorRow,
+			t.CursorColumn,
+		)))
+	}
+	return layout.Flex{Axis: layout.Horizontal}.Layout(gtx,
+		flexTracks...,
+	)
+}
+
+func (t *Tracker) layoutControls(gtx layout.Context) layout.Dimensions {
+	gtx.Constraints.Min.Y = 400
+	gtx.Constraints.Max.Y = 400
+	return layout.Stack{Alignment: layout.NW}.Layout(gtx,
 		layout.Expanded(t.QuitButton.Layout),
 		layout.Stacked(Raised(Label("Hello", white))),
 	)