input: Refactoring: Make Touch a struct

input.go

@@ -128,7 +128,7 @@ func IsGamepadButtonPressed(id int, button GamepadButton) bool {
 func TouchIDs() []int {
 	var ids []int
 	for _, t := range ui.AdjustedTouches() {
-		ids = append(ids, t.ID())
+		ids = append(ids, t.ID)
 	}
 	return ids
 }
@@ -140,8 +140,8 @@ func TouchIDs() []int {
 // TouchPosition is cuncurrent-safe.
 func TouchPosition(id int) (int, int) {
 	for _, t := range ui.AdjustedTouches() {
-		if t.ID() == id {
-			return t.Position()
+		if t.ID == id {
+			return t.X, t.Y
 		}
 	}
 	return 0, 0
@@ -156,12 +156,24 @@ type Touch interface {
 	Position() (x, y int)
 }
 
+type touch struct {
+	t *input.Touch
+}
+
+func (t *touch) ID() int {
+	return t.t.ID
+}
+
+func (t *touch) Position() (x, y int) {
+	return t.t.X, t.t.Y
+}
+
 // Touches is deprecated as of 1.7.0. Use TouchIDs instead.
 func Touches() []Touch {
 	touches := ui.AdjustedTouches()
 	var copies []Touch
-	for _, touch := range touches {
-		copies = append(copies, touch)
+	for _, t := range touches {
+		copies = append(copies, &touch{t})
 	}
 	return copies
 }

internal/input/input.go

@@ -105,23 +105,7 @@ type gamePad struct {
 }
 
 type Touch struct {
-	id int
-	x  int
-	y  int
-}
-
-func NewTouch(id int, x, y int) *Touch {
-	return &Touch{
-		id: id,
-		x:  x,
-		y:  y,
-	}
-}
-
-func (t *Touch) ID() int {
-	return t.id
-}
-
-func (t *Touch) Position() (x, y int) {
-	return t.x, t.y
+	ID int
+	X  int
+	Y  int
 }

internal/input/input_js.go

@@ -276,9 +276,9 @@ func (i *Input) updateTouches(e js.Value) {
 		jj := j.Call("item", i)
 		id := jj.Get("identifier").Int()
 		ts[i] = &Touch{
-			id: id,
-			x:  jj.Get("clientX").Int(),
-			y:  jj.Get("clientY").Int(),
+			ID: id,
+			X:  jj.Get("clientX").Int(),
+			Y:  jj.Get("clientY").Int(),
 		}
 	}
 	i.touches = ts

internal/ui/ui_mobile.go

@@ -128,8 +128,11 @@ func appMain(a app.App) {
 				s := getDeviceScale()
 				x, y := float64(e.X)/s, float64(e.Y)/s
 				// TODO: Is it ok to cast from int64 to int here?
-				t := input.NewTouch(int(e.Sequence), int(x), int(y))
-				touches[e.Sequence] = t
+				touches[e.Sequence] = &input.Touch{
+					ID: int(e.Sequence),
+					X:  int(x),
+					Y:  int(y),
+				}
 			case touch.TypeEnd:
 				delete(touches, e.Sequence)
 			}
@@ -356,8 +359,12 @@ func AdjustedTouches() []*input.Touch {
 	ts := input.Get().Touches()
 	adjusted := make([]*input.Touch, len(ts))
 	for i, t := range ts {
-		x, y := currentUI.adjustPosition(t.Position())
-		adjusted[i] = input.NewTouch(t.ID(), x, y)
+		x, y := currentUI.adjustPosition(t.X, t.Y)
+		adjusted[i] = &input.Touch{
+			ID: t.ID,
+			X:  x,
+			Y:  y,
+		}
 	}
 	return adjusted
 }

mobile/touches_mobile.go

@@ -33,7 +33,11 @@ var (
 func updateTouches() {
 	ts := []*input.Touch{}
 	for id, position := range touches {
-		ts = append(ts, input.NewTouch(id, position.x, position.y))
+		ts = append(ts, &input.Touch{
+			ID: id,
+			X:  position.x,
+			Y:  position.y,
+		})
 	}
 	ui.UpdateTouches(ts)
 }