Adding mousescroll override

input.go

@@ -1,6 +1,7 @@
 package pixelui
 
 import (
+	"github.com/faiface/pixel"
 	"github.com/faiface/pixel/pixelgl"
 	"github.com/inkyblackness/imgui-go"
 )
@@ -45,6 +46,16 @@ func (ui *UI) inputWant(button pixelgl.Button) bool {
 	return ui.io.WantCaptureKeyboard()
 }
 
+// MouseScroll returns the mouse scroll amount if imgui does not want the mouse
+//	(if mouse is not hovering an imgui element)
+func (ui *UI) MouseScroll() pixel.Vec {
+	if ui.io.WantCaptureMouse() {
+		return pixel.ZV
+	}
+
+	return ui.win.MouseScroll()
+}
+
 // JustPressed returns true if imgui hasn't handled the button and the button was just pressed
 func (ui *UI) JustPressed(button pixelgl.Button) bool {
 	return !ui.inputWant(button) && ui.win.JustPressed(button)