Move spacer to layout as that's what it is

canvasobject.go

@@ -38,49 +38,3 @@ type FocusableObject interface {
 
 	OnKeyDown(*KeyEvent)
 }
-
-// SpacerObject is a simple object that can be used in a list layout to space
-// out child objects
-type SpacerObject interface {
-	ExpandVertical() bool
-	ExpandHorizontal() bool
-}
-
-type spacerObject struct {
-	size Size
-	pos  Position
-}
-
-func (s *spacerObject) ExpandVertical() bool {
-	return true
-}
-
-func (s *spacerObject) ExpandHorizontal() bool {
-	return true
-}
-
-func (s *spacerObject) CurrentSize() Size {
-	return s.size
-}
-
-func (s *spacerObject) Resize(size Size) {
-	s.size = size
-}
-
-func (s *spacerObject) CurrentPosition() Position {
-	return s.pos
-}
-
-func (s *spacerObject) Move(pos Position) {
-	s.pos = pos
-}
-
-func (s *spacerObject) MinSize() Size {
-	return NewSize(0, 0)
-}
-
-// NewSpacer returns a spacer object which can fill vertical and horizontal
-// space. This is primarily used with a list layout.
-func NewSpacer() CanvasObject {
-	return &spacerObject{}
-}

examples/main.go

@@ -58,10 +58,10 @@ func welcome(app fyne.App) {
 		appButton(app, "Layout", layoutApp),
 		appButton(app, "Life", lifeApp),
 
-		fyne.NewSpacer(),
+		layout.NewSpacer(),
 		widget.NewEntry(),
 		widget.NewCheck("Check", func(on bool) { fmt.Println("checked", on) }),
-		fyne.NewSpacer(),
+		layout.NewSpacer(),
 		fyne.NewContainerWithLayout(layout.NewGridLayout(2),
 			widget.NewButton("Dark", func() {
 				fyne.GetSettings().SetTheme("dark")

layout/listlayout.go

@@ -10,7 +10,7 @@ type listLayout struct {
 }
 
 func isVerticalSpacer(obj interface{}) bool {
-	if spacer, ok := obj.(fyne.SpacerObject); ok {
+	if spacer, ok := obj.(SpacerObject); ok {
 		return spacer.ExpandVertical()
 	}
 

layout/listlayout_test.go

@@ -108,7 +108,7 @@ func TestSpacerListLayout(t *testing.T) {
 	obj2 := NewMinSizeRect(cellSize.Subtract(fyne.NewSize(25, 0)))
 	obj3 := NewMinSizeRect(cellSize)
 
-	container := fyne.NewContainerWithLayout(NewListLayout(), fyne.NewSpacer(), obj1, obj2, obj3)
+	container := fyne.NewContainerWithLayout(NewListLayout(), NewSpacer(), obj1, obj2, obj3)
 	container.Resize(fyne.NewSize(100, 300))
 	assert.Equal(t, container.MinSize(), fyne.NewSize(100, 150+(theme.Padding()*2)))
 
@@ -127,7 +127,7 @@ func TestMiddleSpacerListLayout(t *testing.T) {
 	obj2 := NewMinSizeRect(cellSize.Subtract(fyne.NewSize(25, 0)))
 	obj3 := NewMinSizeRect(cellSize)
 
-	container := fyne.NewContainerWithLayout(NewListLayout(), obj1, obj2, fyne.NewSpacer(), obj3)
+	container := fyne.NewContainerWithLayout(NewListLayout(), obj1, obj2, NewSpacer(), obj3)
 	container.Resize(fyne.NewSize(100, 300))
 	assert.Equal(t, container.MinSize(), fyne.NewSize(100, 150+(theme.Padding()*2)))
 

layout/spacer.go

@@ -0,0 +1,49 @@
+package layout
+
+import "github.com/fyne-io/fyne"
+
+// SpacerObject is a simple object that can be used in a list layout to space
+// out child objects
+type SpacerObject interface {
+	ExpandVertical() bool
+	ExpandHorizontal() bool
+}
+
+type spacerObject struct {
+	size fyne.Size
+	pos  fyne.Position
+}
+
+func (s *spacerObject) ExpandVertical() bool {
+	return true
+}
+
+func (s *spacerObject) ExpandHorizontal() bool {
+	return true
+}
+
+func (s *spacerObject) CurrentSize() fyne.Size {
+	return s.size
+}
+
+func (s *spacerObject) Resize(size fyne.Size) {
+	s.size = size
+}
+
+func (s *spacerObject) CurrentPosition() fyne.Position {
+	return s.pos
+}
+
+func (s *spacerObject) Move(pos fyne.Position) {
+	s.pos = pos
+}
+
+func (s *spacerObject) MinSize() fyne.Size {
+	return fyne.NewSize(0, 0)
+}
+
+// NewSpacer returns a spacer object which can fill vertical and horizontal
+// space. This is primarily used with a list layout.
+func NewSpacer() fyne.CanvasObject {
+	return &spacerObject{}
+}