Add Focus to Widget interface

box.go

@@ -51,19 +51,20 @@ func (b *Box) SetBackground(background color.RGBA) {
 	b.background = background
 }
 
+func (b *Box) Focus() bool {
+	return false
+}
+
 func (b *Box) SetFocus(focus bool) bool {
 	return false
 }
 
-func (b *Box) SetVisible(visible bool) {
-	b.visible = visible
-}
 func (b *Box) Visible() bool {
 	return b.visible
 }
 
-func (b *Box) Focus() bool {
-	return false
+func (b *Box) SetVisible(visible bool) {
+	b.visible = visible
 }
 
 func (b *Box) HandleMouse(cursor image.Point, pressed bool, clicked bool) (handled bool, err error) {

input.go

@@ -58,6 +58,10 @@ func (i *Input) SetRect(r image.Rectangle) {
 	i.Field.SetRect(r)
 }
 
+func (i *Input) Focus() bool {
+	return i.focus
+}
+
 func (i *Input) SetFocus(focus bool) bool {
 	i.focus = focus
 
@@ -69,10 +73,6 @@ func (i *Input) SetFocus(focus bool) bool {
 	return true
 }
 
-func (i *Input) Focused() bool {
-	return i.focus
-}
-
 func (i *Input) HandleKeyboard(key ebiten.Key, r rune) (handled bool, err error) {
 	if !i.focus {
 		return false, nil

text.go

@@ -44,11 +44,11 @@ func (t *Text) SetBackground(background color.RGBA) {
 	t.background = background
 }
 
-func (t *Text) SetFocus(focus bool) bool {
+func (t *Text) Focus() bool {
 	return false
 }
 
-func (t *Text) Focus() bool {
+func (t *Text) SetFocus(focus bool) bool {
 	return false
 }
 

widget.go

@@ -12,9 +12,10 @@ type Widget interface {
 	SetRect(r image.Rectangle)
 	Background() color.RGBA
 	SetBackground(background color.RGBA)
+	Focus() bool
 	SetFocus(focus bool) (accept bool)
-	SetVisible(visible bool)
 	Visible() bool
+	SetVisible(visible bool)
 	HandleKeyboard(ebiten.Key, rune) (handled bool, err error)
 	HandleMouse(cursor image.Point, pressed bool, clicked bool) (handled bool, err error)
 	Draw(screen *ebiten.Image) error