example/kitchen: add a button that is {dis,en}abled by the switch

This adds a simple button that defaults to being disabled, but can
be enabled by toggling the state of the existing Switch widget.

Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>

example/kitchen/kitchen.go

@@ -147,6 +147,7 @@ var (
 	iconTextButton    = new(widget.Clickable)
 	iconButton        = new(widget.Clickable)
 	flatBtn           = new(widget.Clickable)
+	disableBtn        = new(widget.Clickable)
 	radioButtonsGroup = new(widget.Enum)
 	list              = &layout.List{
 		Axis: layout.Vertical,
@@ -266,6 +267,17 @@ func kitchen(gtx layout.Context, th *material.Theme) layout.Dimensions {
 						material.Switch(th, swtch).Layout,
 					)
 				}),
+				layout.Rigid(func(gtx C) D {
+					return layout.Inset{Left: unit.Dp(16)}.Layout(gtx, func(gtx C) D {
+						text := "enabled"
+						if !swtch.Value {
+							text = "disabled"
+							gtx = gtx.Disabled()
+						}
+						btn := material.Button(th, disableBtn, text)
+						return btn.Layout(gtx)
+					})
+				}),
 			)
 		},
 		func(gtx C) D {