diff --git a/ui/checkbox.go b/ui/checkbox.go
index 94b099b..82ee165 100644
--- a/ui/checkbox.go
+++ b/ui/checkbox.go
@@ -4,7 +4,7 @@ import (
 	"opslag.de/schobers/geom"
 )
 
-type SelectedChangedFn func(ctx Context, c Control, selected bool)
+type SelectedChangedFn func(selected bool)
 
 type Checkbox struct {
 	ControlBase
@@ -100,7 +100,7 @@ func (c *Checkbox) Handle(ctx Context, e Event) {
 			c.Selected = !c.Selected
 			onSelectedChanged := c.onSelectedChanged
 			if onSelectedChanged != nil {
-				onSelectedChanged(ctx, c, c.Selected)
+				onSelectedChanged(c.Selected)
 			}
 		}
 	}
diff --git a/ui/controlbase.go b/ui/controlbase.go
index 5f858e3..f430c78 100644
--- a/ui/controlbase.go
+++ b/ui/controlbase.go
@@ -6,12 +6,12 @@ import (
 	"opslag.de/schobers/geom"
 )
 
-type ClickFn func(ctx Context, c Control, pos geom.PointF32, btn MouseButton)
-type DragEndFn func(ctx Context, c Control, start, end geom.PointF32)
-type DragMoveFn func(ctx Context, c Control, start, move geom.PointF32)
-type DragStartFn func(ctx Context, c Control, start geom.PointF32)
-type MouseEnterFn func(ctx Context, c Control)
-type MouseLeaveFn func(ctx Context, c Control)
+type ClickFn func(pos geom.PointF32, btn MouseButton)
+type DragEndFn func(start, end geom.PointF32)
+type DragMoveFn func(start, move geom.PointF32)
+type DragStartFn func(start geom.PointF32)
+type MouseEnterFn func()
+type MouseLeaveFn func()
 
 var _ Control = &ControlBase{}
 
@@ -66,13 +66,13 @@ func (c *ControlBase) Handle(ctx Context, e Event) {
 				var start = c.ToControlPosition(e.Pos())
 				c.dragStart = &start
 				if c.onDragStart != nil {
-					c.onDragStart(ctx, c, start)
+					c.onDragStart(start)
 				}
 			} else {
 				var start = *c.dragStart
 				var move = c.ToControlPosition(e.Pos())
 				if c.onDragMove != nil {
-					c.onDragMove(ctx, c, start, move)
+					c.onDragMove(start, move)
 				}
 			}
 		}
@@ -90,12 +90,12 @@ func (c *ControlBase) Handle(ctx Context, e Event) {
 				var end = c.ToControlPosition(e.Pos())
 				c.dragStart = nil
 				if c.onDragEnd != nil {
-					c.onDragEnd(ctx, c, start, end)
+					c.onDragEnd(start, end)
 				}
 			}
 			if c.pressed {
 				if c.onClick != nil {
-					c.onClick(ctx, c, c.ToControlPosition(e.Pos()), e.Button)
+					c.onClick(c.ToControlPosition(e.Pos()), e.Button)
 				}
 			}
 			c.pressed = false
diff --git a/ui/scrollbar.go b/ui/scrollbar.go
index 27fe8bb..1c9b3fc 100644
--- a/ui/scrollbar.go
+++ b/ui/scrollbar.go
@@ -18,10 +18,10 @@ type Scrollbar struct {
 
 func BuildScrollbar(o Orientation, fn func(s *Scrollbar)) *Scrollbar {
 	var s = &Scrollbar{Orientation: o, ContentLength: 0, ContentOffset: 0}
-	s.handle.OnDragStart(func(_ Context, _ Control, _ geom.PointF32) {
+	s.handle.OnDragStart(func(_ geom.PointF32) {
 		s.startDragOffset = s.ContentOffset
 	})
-	s.handle.OnDragMove(func(_ Context, _ Control, start, move geom.PointF32) {
+	s.handle.OnDragMove(func(start, move geom.PointF32) {
 		var length = s.Orientation.SizeParallel(s.bounds)
 		var handleMaxOffset = length - s.Orientation.SizeParallel(s.handle.bounds)
 		var hidden = s.ContentLength - length