Fix crash on TAB

composer.go

@@ -203,7 +203,6 @@ func (c *Composer) resizeTopView(ev termbox.Event) bool {
 	}
 
 	w, h := view.Size()
-	wm, hm := view.Constraints()
 	w1, h1 := w, h
 	minW, minH := view.Constraints()
 	if ev.Key == termbox.KeyArrowUp && minH < h {

control_base.go

@@ -171,6 +171,9 @@ func (c *ControlBase) Parent() Control {
 	return c.parent
 }
 
+func (c *ControlBase) RecalculateConstraints() {
+}
+
 //---------- debug ----------------
 func (c *ControlBase) Logger() *log.Logger {
 	if c.parent == nil {

frame.go

@@ -95,6 +95,12 @@ func (f *Frame) RecalculateConstraints() {
 	if newW != width || newH != height {
 		f.SetConstraints(newW, newH)
 	}
+
+	if f.parent != nil {
+		f.parent.RecalculateConstraints()
+	} else if f.view != nil {
+		f.view.RecalculateConstraints()
+	}
 }
 
 func (f *Frame) AddChild(c Control, scale int) {

interface.go

@@ -59,6 +59,7 @@ type View interface {
 	SetScale(int)
 	TabStop() bool
 	Colors() (term.Attribute, term.Attribute)
+	RecalculateConstraints()
 
 	Logger() *log.Logger
 }
@@ -86,5 +87,7 @@ type Control interface {
 	Parent() Control
 	Colors() (term.Attribute, term.Attribute)
 
+	RecalculateConstraints()
+
 	Logger() *log.Logger
 }

label.go

@@ -23,7 +23,7 @@ func NewLabel(view View, parent Control, w, h int, title string, scale int) *Lab
 	c.tabSkip = true
 
 	c.fg = ColorWhite
-	c.bg = ColorBlack
+	c.bg = ColorBlackBold
 
 	if parent != nil {
 		parent.AddChild(c, scale)

window.go

@@ -276,7 +276,9 @@ func (w *Window) ProcessEvent(ev Event) bool {
 		if ev.Type == EventKey && (ev.Key == term.KeyTab || (ev.Mod&term.ModAlt != 0 && (ev.Key == term.KeyPgup || ev.Key == term.KeyPgdn))) {
 			forward := ev.Key != term.KeyPgup
 			ctrl := w.ActiveControl()
-			ctrl.ProcessEvent(Event{Type: EventActivate, X: 0})
+			if ctrl != nil {
+				ctrl.ProcessEvent(Event{Type: EventActivate, X: 0})
+			}
 			ctrl = w.NextControl(ctrl, forward)
 			if ctrl != nil {
 				// w.Logger().Printf("Activate control: %v", ctrl)