Scroll container mouse pass through

elements/basic/scrollcontainer.go

@@ -100,6 +100,31 @@ func (element *ScrollContainer) HandleKeyUp (key tomo.Key, modifiers tomo.Modifi
 	}
 }
 
+func (element *ScrollContainer) HandleMouseDown (x, y int, button tomo.Button) {
+	if child, ok := element.child.(tomo.MouseTarget); ok {
+		child.HandleMouseDown(x, y, button)
+	}
+}
+
+func (element *ScrollContainer) HandleMouseUp (x, y int, button tomo.Button) {
+	if child, ok := element.child.(tomo.MouseTarget); ok {
+		child.HandleMouseUp(x, y, button)
+	}
+}
+
+func (element *ScrollContainer) HandleMouseMove (x, y int) {
+	if child, ok := element.child.(tomo.MouseTarget); ok {
+		child.HandleMouseMove(x, y)
+	}
+}
+
+func (element *ScrollContainer) HandleMouseScroll (
+	x, y int,
+	deltaX, deltaY float64,
+) {
+	// TODO: do not pass this down to the child 
+}
+
 func (element *ScrollContainer) Selected () (selected bool) {
 	return element.selected
 }
@@ -213,6 +238,13 @@ func (element *ScrollContainer) draw () {
 	artist.Paste(element.core, element.child, image.Point { })
 	element.drawHorizontalBar()
 	element.drawVerticalBar()
+	artist.FillRectangle (
+		element, theme.BackgroundPattern(),
+		image.Rect (
+			element.vertical.bounds.Min.X,
+			element.horizontal.bounds.Min.Y,
+			element.vertical.bounds.Max.X,
+			element.horizontal.bounds.Max.Y))
 }
 
 func (element *ScrollContainer) drawHorizontalBar () {

elements/basic/textbox.go

@@ -58,7 +58,7 @@ func (element *TextBox) HandleMouseDown (x, y int, button tomo.Button) {
 
 func (element *TextBox) HandleMouseUp (x, y int, button tomo.Button) { }
 func (element *TextBox) HandleMouseMove (x, y int) { }
-func (element *TextBox) HandleScroll (x, y int, deltaX, deltaY float64) { }
+func (element *TextBox) HandleMouseScroll (x, y int, deltaX, deltaY float64) { }
 
 func (element *TextBox) HandleKeyDown (
 	key tomo.Key,

examples/scroll/main.go

@@ -20,7 +20,7 @@ func run () {
 	textBox := basic.NewTextBox("", "sample text sample text")
 	scrollContainer := basic.NewScrollContainer(true, true)
 	scrollContainer.Adopt(textBox)
-	container.Adopt(scrollContainer, false)
+	container.Adopt(scrollContainer, true)
 	
 	window.OnClose(tomo.Stop)
 	window.Show()