Added override for scrollbar color.

ui/overflow.go

@@ -23,11 +23,17 @@ type overflow struct {
 	ver *Scrollbar
 }
 
-func Overflow(content Control) Control {
+type ScrollControl interface {
+	Control
+
+	SetScrollbarColor(bar color.Color, hover color.Color)
+}
+
+func Overflow(content Control) ScrollControl {
 	return OverflowBackground(content, nil)
 }
 
-func OverflowBackground(content Control, back color.Color) Control {
+func OverflowBackground(content Control, back color.Color) ScrollControl {
 	var o = &overflow{Proxy: Proxy{Content: content}, Background: back}
 	o.hor = BuildScrollbar(OrientationHorizontal, func(*Scrollbar) {})
 	o.ver = BuildScrollbar(OrientationVertical, func(*Scrollbar) {})
@@ -152,3 +158,10 @@ func (o *overflow) Render(ctx Context) {
 		bar.Render(ctx)
 	})
 }
+
+func (o *overflow) SetScrollbarColor(bar color.Color, hover color.Color) {
+	o.hor.BarColor = bar
+	o.hor.BarHoverColor = hover
+	o.ver.BarColor = bar
+	o.ver.BarHoverColor = hover
+}

ui/scrollbar.go

@@ -1,6 +1,8 @@
 package ui
 
 import (
+	"image/color"
+
 	"opslag.de/schobers/geom"
 	"opslag.de/schobers/zntg"
 )
@@ -10,6 +12,8 @@ type Scrollbar struct {
 
 	Orientation Orientation
 
+	BarColor      color.Color
+	BarHoverColor color.Color
 	ContentLength float32
 	ContentOffset float32
 
@@ -58,7 +62,7 @@ func (s *Scrollbar) Handle(ctx Context, e Event) bool {
 
 func (s *Scrollbar) Render(ctx Context) {
 	ctx.Renderer().FillRectangle(s.bounds, zntg.RGBA(0, 0, 0, 1))
-	s.handle.Render(ctx)
+	s.handle.Render(ctx, s)
 }
 
 func (s *Scrollbar) updateBar(ctx Context) {
@@ -83,12 +87,22 @@ type ScrollbarHandle struct {
 	ControlBase
 }
 
-func (h *ScrollbarHandle) Render(ctx Context) {
+func (h *ScrollbarHandle) Render(ctx Context, s *Scrollbar) {
 	h.RenderBackground(ctx)
 	p := ctx.Style().Palette
-	fill := p.Primary
+	var fill color.Color
 	if h.over {
+		if s.BarHoverColor == nil {
 			fill = p.PrimaryLight
+		} else {
+			fill = s.BarHoverColor
+		}
+	} else {
+		if s.BarColor == nil {
+			fill = p.Primary
+		} else {
+			fill = s.BarColor
+		}
 	}
 	ctx.Renderer().FillRectangle(h.bounds.Inset(1), fill)
 }