Changed the API for scrolling

application.go

@@ -63,6 +63,12 @@ func (application *Application) OnMouseMove (
 	application.callbackManager.onMouseMove = onMouseMove
 }
 
+func (application *Application) OnScroll (
+	onScroll func (x, y int),
+) {
+	application.callbackManager.onScroll = onScroll
+}
+
 func (application *Application) OnStart (
 	onStart func (),
 ) {

backends/x/event.go

@@ -68,14 +68,28 @@ func (backend *Backend) handleButtonPress (
 	event xevent.ButtonPressEvent,
 ) {
 	buttonEvent := *event.ButtonPressEvent
+	if buttonEvent.Detail >= 4 && buttonEvent.Detail <= 7 {
+		switch buttonEvent.Detail {
+		case 4:
+			backend.callbackManager.RunScroll(0, -1)
+		case 5:
+			backend.callbackManager.RunScroll(0, 1)
+		case 6:
+			backend.callbackManager.RunScroll(-1, 0)
+		case 7:
+			backend.callbackManager.RunScroll(1, 0)
+		}
+	} else {
 		backend.callbackManager.RunPress(stone.Button(buttonEvent.Detail + 127))
 	}
+}
 
 func (backend *Backend) handleButtonRelease (
 	connection *xgbutil.XUtil,
 	event xevent.ButtonReleaseEvent,
 ) {
 	buttonEvent := *event.ButtonReleaseEvent
+	if buttonEvent.Detail >= 4 && buttonEvent.Detail <= 7 { return }
 	backend.callbackManager.RunRelease(stone.Button(buttonEvent.Detail + 127))
 }
 

event.go

@@ -6,6 +6,7 @@ type CallbackManager struct {
 	onRelease   func (button Button)
 	onResize    func ()
 	onMouseMove func (x, y int)
+	onScroll    func (x, y int)
 	onStart     func ()
 }
 
@@ -34,6 +35,11 @@ func (manager *CallbackManager) RunMouseMove (x, y int) {
 	manager.onMouseMove(x, y)
 }
 
+func (manager *CallbackManager) RunScroll (x, y int) {
+	if manager.onScroll == nil { return }
+	manager.onScroll(x, y)
+}
+
 func (manager *CallbackManager) RunStart () {
 	if manager.onStart == nil { return }
 	manager.onStart()

input.go

@@ -52,10 +52,6 @@ const (
 	MouseButtonLeft        Button = MouseButton1
 	MouseButtonMiddle      Button = MouseButton2
 	MouseButtonRight       Button = MouseButton3
-	MouseButtonScrollUp    Button = MouseButton4
-	MouseButtonScrollDown  Button = MouseButton5
-	MouseButtonScrollLeft  Button = MouseButton6
-	MouseButtonScrollRight Button = MouseButton7
 	MouseButtonBack        Button = MouseButton8
 	MouseButtonForward     Button = MouseButton9