Overhauled event system

examples/draw/main.go

@@ -10,7 +10,7 @@ var application = &stone.Application { }
 var mousePressed bool
 
 func main () {
-	application.SetTitle("hellorld")
+	application.SetTitle("drawing canvas")
 	application.SetSize(32, 16)
 
 	iconFile16, err := os.Open("assets/scaffold16.png")
@@ -26,42 +26,37 @@ func main () {
 	
 	application.SetIcon([]image.Image { icon16, icon32 })
 	
-	channel, err := application.Run()
-	if err != nil { panic(err) }
+	application.OnPress(onPress)
+	application.OnRelease(onRelease)
+	application.OnMouseMove(onMouseMove)
+	application.OnQuit(onQuit)
 	
-	application.Draw()
+	err = application.Run()
+	if err != nil { panic(err) }
+}
 
-	for {
-		event := <- channel
-		switch event.(type) {
-		case stone.EventQuit:
-			os.Exit(0)
-
-		case stone.EventPress:
-			button := event.(stone.EventPress).Button
-			if button == stone.MouseButtonLeft {
-				mousePressed = true
-				application.SetRune(0, 0, '+')
-				application.Draw()
-			}
-
-		case stone.EventRelease:
-			button := event.(stone.EventRelease).Button
-			if button == stone.MouseButtonLeft {
-				mousePressed = false
-				application.SetRune(0, 0, 0)
-				application.Draw()
-			}
-
-		case stone.EventMouseMove:
-			event := event.(stone.EventMouseMove)
-			if mousePressed {
-				application.SetRune(event.X, event.Y, '#')
-				application.Draw()
-			}
-
-		case stone.EventResize:
-			application.Draw()
-		}
+func onPress (button stone.Button) {
+	if button == stone.MouseButtonLeft {
+		mousePressed = true
+		application.SetRune(0, 0, '+')
+		application.Draw()
 	}
 }
+
+func onRelease (button stone.Button) {
+	if button == stone.MouseButtonLeft {
+		mousePressed = false
+		application.SetRune(0, 0, 0)
+		application.Draw()
+	}
+}
+
+func onMouseMove (x, y int) {	if mousePressed {
+		application.SetRune(x, y, '#')
+		application.Draw()
+	}
+}
+
+func onQuit () {
+	os.Exit(0)
+}