1 files changed, 28 insertions, 2 deletions
diff --git a/go/ui/touchManager.go b/go/ui/touchManager.go
index 462b9934..b675ff0e 100644
--- a/go/ui/touchManager.go
+++ b/go/ui/touchManager.go
@@ -22,20 +22,25 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/inpututil"
 )
 
+const LONGTAP_THRESHOLD = 75
+
 type TouchType int
 
 const (
 	_tap TouchType = iota + 1
+	_longtap
 	_pan
 	_pinch
 )
 
 var touchTypes = struct {
 	tap   TouchType
+	longtap   TouchType
 	pan   TouchType
 	pinch TouchType
 }{
 	tap:   _tap,
+	longtap:   _longtap,
 	pan:   _pan,
 	pinch: _pinch,
 }
@@ -48,6 +53,7 @@ type TouchInput struct {
 
 	pinch *pinch
 	pan   *pan
+	longtap   *longtap
 	taps  []tap
 }
 
@@ -99,9 +105,14 @@ func (in *TouchInput) Update() error {
 				in.pan = nil
 			}
 
+			if in.longtap != nil && id == in.longtap.id {
+				// FIXME: what about this frame's movement?
+				in.longtap = nil
+			}
+
 			// If this one has not been touched long, or moved far, then it's a tap.
 			diff := hypotenuse(t.originX, t.originY, t.currX, t.currY)
-			if !t.wasPinch && !t.isPan && (t.duration <= 75 || diff < 5) {
+			if !t.wasPinch && !t.isPan && (t.duration <= LONGTAP_THRESHOLD || diff < 5) {
 				in.taps = append(in.taps, tap{
 					x: t.currX,
 					y: t.currY,
@@ -165,6 +176,15 @@ func (in *TouchInput) Update() error {
 					prevY:   t.originY,
 				}
 			}
+		} else if t.duration > LONGTAP_THRESHOLD {
+			id := in.touchIDs[0]
+			t := in.touches[id]
+			t.isLongtap = true
+			in.longtap = &longtap{
+				id: id,
+				tap: tap{t.originX, t.originY},
+				duration: t.duration,
+			}
 		}
 	}
 
@@ -175,7 +195,7 @@ type touch struct {
 	originX, originY int
 	currX, currY     int
 	duration         int
-	wasPinch, isPan  bool
+	wasPinch, isPan, isLongtap  bool
 }
 
 type pinch struct {
@@ -228,3 +248,9 @@ func (p *pan) Incremental() (float64, float64) {
 type tap struct {
 	x, y int
 }
+
+type longtap struct {
+	tap
+	id ebiten.TouchID
+	duration int
+}