TwoFingerDragGesture(TwoFingerDragGestureRecognizer recognizer, CommonTouch touch1, CommonTouch touch2)
: base(recognizer)
{
fingerId1 = touch1.fingerId;
startPosition1 = touch1.position;
fingerId2 = touch2.fingerId;
startPosition2 = touch2.position;
position = (startPosition1 + startPosition2) / 2;
}
/// <summary>
/// Constructs a two finger drag gesture.
/// </summary>
/// <param name="recognizer">The gesture recognizer.</param>
/// <param name="touch1">The first touch that started this gesture.</param>
/// <param name="touch2">The second touch that started this gesture.</param>
public TwoFingerDragGesture(
TwoFingerDragGestureRecognizer recognizer, Touch touch1, Touch touch2) :
base(recognizer)
{
FingerId1 = touch1.fingerId;
StartPosition1 = touch1.position;
FingerId2 = touch2.fingerId;
StartPosition2 = touch2.position;
Position = (StartPosition1 + StartPosition2) / 2;
}
/// <summary>
/// Returns true if this gesture can start.
/// </summary>
/// <returns>True if the gesture can start.</returns>
protected internal override bool CanStart()
{
if (GestureTouchesUtility.IsFingerIdRetained(FingerId1) ||
GestureTouchesUtility.IsFingerIdRetained(FingerId2))
{
Cancel();
return(false);
}
Touch touch1, touch2;
bool foundTouches = GestureTouchesUtility.TryFindTouch(FingerId1, out touch1);
foundTouches =
GestureTouchesUtility.TryFindTouch(FingerId2, out touch2) && foundTouches;
if (!foundTouches)
{
Cancel();
return(false);
}
// Check that at least one finger is moving.
if (touch1.deltaPosition == Vector2.zero && touch2.deltaPosition == Vector2.zero)
{
return(false);
}
Vector2 pos1 = touch1.position;
float diff1 = (pos1 - StartPosition1).magnitude;
Vector2 pos2 = touch2.position;
float diff2 = (pos2 - StartPosition2).magnitude;
float slopInches = (m_Recognizer as TwoFingerDragGestureRecognizer).m_SlopInches;
if (GestureTouchesUtility.PixelsToInches(diff1) < slopInches ||
GestureTouchesUtility.PixelsToInches(diff2) < slopInches)
{
return(false);
}
TwoFingerDragGestureRecognizer recognizer =
m_Recognizer as TwoFingerDragGestureRecognizer;
// Check both fingers move in the same direction.
float dot =
Vector3.Dot(touch1.deltaPosition.normalized, touch2.deltaPosition.normalized);
if (dot < Mathf.Cos(recognizer.m_AngleThresholdRadians))
{
return(false);
}
return(true);
}
/// <summary>
/// Constructs a two finger drag gesture.
/// </summary>
/// <param name="recognizer">The gesture recognizer.</param>
/// <param name="touch1">The first touch that started this gesture.</param>
/// <param name="touch2">The second touch that started this gesture.</param>
public TwoFingerDragGesture(TwoFingerDragGestureRecognizer recognizer, InputSystem.EnhancedTouch.Touch touch1, InputSystem.EnhancedTouch.Touch touch2)
: this(recognizer, new CommonTouch(touch1), new CommonTouch(touch2))
{
}
/// <summary>
/// Constructs a two finger drag gesture.
/// </summary>
/// <param name="recognizer">The gesture recognizer.</param>
/// <param name="touch1">The first touch that started this gesture.</param>
/// <param name="touch2">The second touch that started this gesture.</param>
public TwoFingerDragGesture(TwoFingerDragGestureRecognizer recognizer, Touch touch1, Touch touch2)
: this(recognizer, new CommonTouch(touch1), new CommonTouch(touch2))
{
}
