Set up attribute for rendering placement and size

exhibit/list_widget.go

@@ -10,8 +10,9 @@ type ListEntry interface {
 }
 
 type ListWidget struct {
-	Constraints Constraints
-	Attrs       Attributes
+	Constrs Constraints
+	Attrs   Attributes
+	Size    Size
 
 	cellLock sync.Mutex
 	cells    [][]Cell
@@ -27,6 +28,10 @@ type ListWidget struct {
 	lastSize Size
 }
 
+func (l *ListWidget) SetSize(size Size) {
+	l.Size = size
+}
+
 func (l *ListWidget) Render() [][]Cell {
 	l.cellLock.Lock()
 	defer l.cellLock.Unlock()
@@ -74,6 +79,10 @@ func (l *ListWidget) Render() [][]Cell {
 	return append([][]Cell(nil), l.cells...)
 }
 
+func (l ListWidget) Constraints() Constraints {
+	return l.Constrs
+}
+
 func (l *ListWidget) AddEntry(entry ListEntry) {
 	if l.listBuf == nil {
 		l.listBuf = make([][]Cell, 1)

exhibit/scene.go

@@ -6,6 +6,8 @@ type Scene struct {
 }
 
 func (s *Scene) Render() {
+	s.Window.SetSize(s.Terminal.Size())
+
 	c := make([]Cell, 0)
 
 	for _, row := range s.Window.Render() {

exhibit/terminal.go

@@ -23,11 +23,6 @@ const (
 	cup        = "\x1b[%v;%vH"
 )
 
-type Size struct {
-	X int
-	Y int
-}
-
 type Terminal struct {
 	Event <-chan Event
 

exhibit/widget.go

@@ -13,6 +13,14 @@ type Constraints struct {
 	Right  bool
 }
 
-type Widget interface {
-	Render() [][]Cell
+type Size struct {
+	X int
+	Y int
+}
+
+
+type Widget interface {
+	Render()      [][]Cell
+	Constraints() Constraints
+	SetSize(size Size)
 }

exhibit/window_widget.go

@@ -1,8 +1,9 @@
 package exhibit
 
 type WindowWidget struct {
-	Constraints Constraints
-	Border      Border
+	Constrs Constraints
+	Size    Size
+	Border  Border
 
 	widgets []Widget
 }
@@ -15,6 +16,14 @@ func (w *WindowWidget) AddWidget(widget Widget) {
 	w.widgets = append(w.widgets, widget)
 }
 
+func (w *WindowWidget) SetSize(size Size) {
+	w.Size = size
+}
+
+func (w *WindowWidget) Constraints() Constraints {
+	return w.Constrs
+}
+
 func (w *WindowWidget) Render() [][]Cell {
 	c := make([][]Cell, 0)
 

spectator.go

@@ -78,7 +78,7 @@ func main() {
 
 	window = &exhibit.WindowWidget{}
 	topAsks = &exhibit.ListWidget{}
-	window.Constraints.Bottom = true
+	window.Constrs.Bottom = true
 	topAsks.SetBorder(true)
 	topAsks.SetRightAlign(true)
 	topAsks.Attrs.ForegroundColor = exhibit.FGYellow