backends/x/x.go

@@ -161,6 +161,21 @@ func (backend *Backend) handleButtonRelease (
 	backend.channel <- stone.EventRelease(buttonEvent.Detail)
 }
 
+func (backend *Backend) handleMotionNotify (
+	connection *xgbutil.XUtil,
+	event xevent.MotionNotifyEvent,
+) {
+	motionEvent := *event.MotionNotifyEvent
+	x, y := backend.cellAt (image.Point {
+		X: int(motionEvent.EventX),
+		Y: int(motionEvent.EventY),
+	})
+	backend.channel <- stone.EventMouseMove {
+		X: x,
+		Y: y,
+	}
+}
+
 func (backend *Backend) compressConfigureNotify (
 	firstEvent xproto.ConfigureNotifyEvent,
 ) (
@@ -292,6 +307,12 @@ func (backend *Backend) drawRune (x, y int, character rune) {
 		draw.Over)
 }
 
+func (backend *Backend) cellAt (onScreen image.Point) (x, y int) {
+	x = (onScreen.X - backend.metrics.paddingX) / backend.metrics.cellWidth
+	y = (onScreen.Y - backend.metrics.paddingY) / backend.metrics.cellHeight
+	return
+}
+
 func (backend *Backend) cellSubImage (x, y int) (cell *xgraphics.Image) {
 	cell = backend.canvas.SubImage(backend.boundsOfCell(x, y)).(*xgraphics.Image)
 	return
@@ -375,7 +396,7 @@ func factory (application *stone.Application) (output stone.Backend, err error)
 	// keyboard buttons (uncompressed)
 	err = backend.window.Listen (
 		xproto.EventMaskStructureNotify,
-		// xproto.EventMaskPointerMotion,
+		xproto.EventMaskPointerMotion,
 		// xproto.EventMaskKeyPress,
 		// xproto.EventMaskKeyRelease,
 		xproto.EventMaskButtonPress,
@@ -400,6 +421,8 @@ func factory (application *stone.Application) (output stone.Backend, err error)
 		Connect(backend.connection, backend.window.Id)
 	xevent.ButtonReleaseFun(backend.handleButtonRelease).
 		Connect(backend.connection, backend.window.Id)
+	xevent.MotionNotifyFun(backend.handleMotionNotify).
+		Connect(backend.connection, backend.window.Id)
 	
 	output = backend
 	return

examples/draw/main.go

@@ -55,8 +55,10 @@ func main () {
 
 		case stone.EventMouseMove:
 			event := event.(stone.EventMouseMove)
-			application.SetRune(event.X, event.Y, '#')
-			application.Draw()
+			if mousePressed {
+				application.SetRune(event.X, event.Y, '#')
+				application.Draw()
+			}
 
 		case stone.EventResize:
 			application.Draw()