Menu: touch swipe-to-scroll with tap disambiguation, fling, wider scrollbar

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

scripts/MenuSpike.cs

@@ -91,6 +91,32 @@ public partial class MenuSpike : Node3D
         await Frame(3);
     }
 
+    // Touch down at `from`, slide to `to` while in contact, lift. fling = a fast 4-frame slide.
+    private async Task TouchDrag(int hand, Vector2 from, Vector2 to, bool fling = false)
+    {
+        for (float d = 0.06f; d > -0.004f; d -= 0.004f)
+        {
+            TipAt(hand, from, d);
+            await Frame();
+        }
+        // A fling lifts while still moving (as a real flick does); a slow drag stops, then lifts.
+        int steps = fling ? 8 : 30;
+        for (int i = 1; i <= steps; i++)
+        {
+            float lift = fling ? Mathf.Max(0f, i - 4) * 0.008f : 0f;
+            TipAt(hand, from.Lerp(to, i / (float)steps), -0.004f + lift);
+            await Frame();
+        }
+        float start = fling ? -0.004f + (steps - 4) * 0.008f : -0.004f;
+        for (float d = start; d < 0.08f; d += 0.006f)
+        {
+            TipAt(hand, to, d);
+            await Frame();
+        }
+        ClearHand(hand);
+        await Frame(3);
+    }
+
     // Laser from 0.8 m, off-axis, aimed at the pixel.
     private void LaserAt(int hand, Vector2 pixel, bool trigger, Vector2 stick = default)
     {
@@ -235,6 +261,34 @@ public partial class MenuSpike : Node3D
         await Frame(2);
         Check("stick: scroll down then up", scrolled > 50 && scrolledBack < scrolled, $"({scrolled} → {scrolledBack})");
 
+        // 6b) Touch swipe vs tap inside the scrollable log.
+        Button logButton = new() { Text = "in-log button", CustomMinimumSize = new Vector2(0, 48) };
+        int logButtonPresses = 0;
+        logButton.Pressed += () => logButtonPresses++;
+        _menu.LogScroll.GetChild(0).AddChild(logButton);
+        _menu.LogScroll.GetChild(0).MoveChild(logButton, 0);
+        _menu.LogScroll.ScrollVertical = 0;
+        await Frame(5);
+        int clicksBefore = _clicks;
+        await TouchDrag(1, logPx, logPx + new Vector2(0, -150));
+        int swiped = _menu.LogScroll.ScrollVertical;
+        Check("touch: swipe up scrolls the log", swiped >= 120, $"(scroll 0 → {swiped})");
+        Check("touch: swipe sends no click", _clicks == clicksBefore && logButtonPresses == 0, $"(clicks +{_clicks - clicksBefore})");
+        await TouchDrag(1, logPx, logPx + new Vector2(0, 80), fling: true);
+        await Frame(60);
+        int flung = _menu.LogScroll.ScrollVertical;
+        Check("touch: fast swipe down flings past the finger", flung < swiped - 60, $"({swiped} → {flung})");
+        _menu.LogScroll.ScrollVertical = 0;
+        await Frame(5);
+        Vector2 btnPx = Center(logButton);
+        await TouchDrag(1, btnPx, btnPx + new Vector2(6, 5));
+        Check("touch: small-jitter tap on in-log button clicks", logButtonPresses == 1 && _menu.LogScroll.ScrollVertical == 0,
+            $"(presses={logButtonPresses}, scroll={_menu.LogScroll.ScrollVertical})");
+        VScrollBar vbar = _menu.LogScroll.GetVScrollBar();
+        Rect2 br = vbar.GetGlobalRect();
+        await TouchDrag(1, new Vector2(br.GetCenter().X, br.Position.Y + 10), new Vector2(br.GetCenter().X, br.End.Y - 10));
+        Check("touch: scrollbar still drags directly", _menu.LogScroll.ScrollVertical > 100, $"(scroll={_menu.LogScroll.ScrollVertical})");
+
         // 7) Recalibrate: disabled without a calibration node, enabled + calls it when present.
         await TouchPress(1, TabCenter(0));
         Check("Recalibrate disabled without group node", _menu.RecalibrateButton.Disabled);