/// <inheritdoc />
protected internal override bool CanStart()
{
if (GestureTouchesUtility.IsFingerIdRetained(fingerId1) ||
GestureTouchesUtility.IsFingerIdRetained(fingerId2))
{
Cancel();
return(false);
}
var foundTouches = GestureTouchesUtility.TryFindTouch(fingerId1, out var touch1);
foundTouches =
GestureTouchesUtility.TryFindTouch(fingerId2, out var touch2) && foundTouches;
if (!foundTouches)
{
Cancel();
return(false);
}
// Check that both fingers are moving.
if (touch1.deltaPosition == Vector2.zero || touch2.deltaPosition == Vector2.zero)
{
return(false);
}
var rotation = CalculateDeltaRotation(
touch1.position, touch2.position, startPosition1, startPosition2);
return(Mathf.Abs(rotation) >= twistRecognizer.slopRotation);
}
/// <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);
}
PinchGestureRecognizer pinchRecognizer = m_Recognizer as PinchGestureRecognizer;
Vector3 firstToSecondDirection = (StartPosition1 - StartPosition2).normalized;
float dot1 = Vector3.Dot(touch1.deltaPosition.normalized, -firstToSecondDirection);
float dot2 = Vector3.Dot(touch2.deltaPosition.normalized, firstToSecondDirection);
float dotThreshold =
Mathf.Cos(pinchRecognizer.m_SlopMotionDirectionDegrees * Mathf.Deg2Rad);
// Check angle of motion for the first touch.
if (touch1.deltaPosition != Vector2.zero && Mathf.Abs(dot1) < dotThreshold)
{
return(false);
}
// Check angle of motion for the second touch.
if (touch2.deltaPosition != Vector2.zero && Mathf.Abs(dot2) < dotThreshold)
{
return(false);
}
float startgap = (StartPosition1 - StartPosition2).magnitude;
Gap = (touch1.position - touch2.position).magnitude;
float separation = GestureTouchesUtility.PixelsToInches(Mathf.Abs(Gap - startgap));
if (separation < pinchRecognizer.m_SlopInches)
{
return(false);
}
return(true);
}
/// <summary>
/// Returns true if this gesture can start.
/// </summary>
/// <returns>Returns <see langword="true"/> if the gesture can start. Returns <see langword="false"/> otherwise.</returns>
protected internal override bool CanStart()
{
if (GestureTouchesUtility.IsFingerIdRetained(fingerId))
{
Cancel();
return(false);
}
return(true);
}
/// <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);
}
void TryCreateOneFingerGestureOnTouchBegan(Func <CommonTouch, T> createGestureFunction)
{
foreach (var touch in GestureTouchesUtility.touches)
{
if (touch.isPhaseBegan &&
!GestureTouchesUtility.IsFingerIdRetained(touch.fingerId) &&
!GestureTouchesUtility.IsTouchOffScreenEdge(touch))
{
var gesture = createGestureFunction(touch);
AddGesture(gesture);
}
}
}
/// <inheritdoc />
protected internal override bool CanStart()
{
if (GestureTouchesUtility.IsFingerIdRetained(fingerId1) ||
GestureTouchesUtility.IsFingerIdRetained(fingerId2))
{
Cancel();
return(false);
}
var foundTouches = GestureTouchesUtility.TryFindTouch(fingerId1, out var touch1);
foundTouches =
GestureTouchesUtility.TryFindTouch(fingerId2, out var 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);
}
Vector3 firstToSecondDirection = (startPosition1 - startPosition2).normalized;
var dot1 = Vector3.Dot(touch1.deltaPosition.normalized, -firstToSecondDirection);
var dot2 = Vector3.Dot(touch2.deltaPosition.normalized, firstToSecondDirection);
var dotThreshold = Mathf.Cos(pinchRecognizer.slopMotionDirectionDegrees * Mathf.Deg2Rad);
// Check angle of motion for the first touch.
if (touch1.deltaPosition != Vector2.zero && Mathf.Abs(dot1) < dotThreshold)
{
return(false);
}
// Check angle of motion for the second touch.
if (touch2.deltaPosition != Vector2.zero && Mathf.Abs(dot2) < dotThreshold)
{
return(false);
}
var startgap = (startPosition1 - startPosition2).magnitude;
gap = (touch1.position - touch2.position).magnitude;
var separation = GestureTouchesUtility.PixelsToInches(Mathf.Abs(gap - startgap));
return(separation >= pinchRecognizer.slopInches);
}
/// <summary>
/// Helper function for creating one finger gestures when a touch begins.
/// </summary>
/// <param name="createGestureFunction">Function to be executed to create the gesture.</param>
protected internal void TryCreateOneFingerGestureOnTouchBegan(
Func <Touch, T> createGestureFunction)
{
for (int i = 0; i < GestureTouchesUtility.Touches.Length; i++)
{
Touch touch = GestureTouchesUtility.Touches[i];
if (touch.phase == TouchPhase.Began &&
!GestureTouchesUtility.IsFingerIdRetained(touch.fingerId) &&
!GestureTouchesUtility.IsTouchOffScreenEdge(touch))
{
T gesture = createGestureFunction(touch);
gesture.onStart += OnStart;
gesture.onFinished += OnFinished;
m_Gestures.Add(gesture);
}
}
}
void TryCreateGestureTwoFingerGestureOnTouchBeganForTouchIndex(
int touchIndex,
Func <Touch, Touch, T> createGestureFunction)
{
if (GestureTouchesUtility.Touches[touchIndex].phase != TouchPhase.Began)
{
return;
}
var touch = GestureTouchesUtility.Touches[touchIndex];
if (GestureTouchesUtility.IsFingerIdRetained(touch.fingerId) ||
GestureTouchesUtility.IsTouchOffScreenEdge(touch))
{
return;
}
for (var i = 0; i < GestureTouchesUtility.Touches.Length; i++)
{
if (i == touchIndex)
{
continue;
}
// Prevents the same two touches from creating two gestures if both touches began on
// the same frame.
if (i < touchIndex && GestureTouchesUtility.Touches[i].phase == TouchPhase.Began)
{
continue;
}
var otherTouch = GestureTouchesUtility.Touches[i];
if (GestureTouchesUtility.IsFingerIdRetained(otherTouch.fingerId) ||
GestureTouchesUtility.IsTouchOffScreenEdge(otherTouch))
{
continue;
}
var gesture = createGestureFunction(touch, otherTouch);
gesture.onStart += OnStart;
gesture.onFinished += OnFinished;
m_Gestures.Add(gesture);
}
}
/// <inheritdoc />
protected internal override bool CanStart()
{
if (GestureTouchesUtility.IsFingerIdRetained(fingerId1) ||
GestureTouchesUtility.IsFingerIdRetained(fingerId2))
{
Cancel();
return(false);
}
var foundTouches = GestureTouchesUtility.TryFindTouch(fingerId1, out var touch1);
foundTouches =
GestureTouchesUtility.TryFindTouch(fingerId2, out var 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);
}
var pos1 = touch1.position;
var diff1 = (pos1 - startPosition1).magnitude;
var pos2 = touch2.position;
var diff2 = (pos2 - startPosition2).magnitude;
var slopInches = dragRecognizer.slopInches;
if (GestureTouchesUtility.PixelsToInches(diff1) < slopInches ||
GestureTouchesUtility.PixelsToInches(diff2) < slopInches)
{
return(false);
}
// Check both fingers move in the same direction.
var dot = Vector3.Dot(touch1.deltaPosition.normalized, touch2.deltaPosition.normalized);
return(dot >= Mathf.Cos(dragRecognizer.angleThresholdRadians));
}
/// <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(FingerId))
{
Cancel();
return(false);
}
if (GestureTouchesUtility.Touches.Length > 1)
{
for (int i = 0; i < GestureTouchesUtility.Touches.Length; i++)
{
Touch currentTouch = GestureTouchesUtility.Touches[i];
if (currentTouch.fingerId != FingerId &&
!GestureTouchesUtility.IsFingerIdRetained(currentTouch.fingerId))
{
return(false);
}
}
}
Touch touch;
if (GestureTouchesUtility.TryFindTouch(FingerId, out touch))
{
Vector2 pos = touch.position;
float diff = (pos - StartPosition).magnitude;
if (GestureTouchesUtility.PixelsToInches(diff) >=
(m_Recognizer as DragGestureRecognizer).m_SlopInches)
{
return(true);
}
}
else
{
Cancel();
}
return(false);
}
void TryCreateGestureTwoFingerGestureOnTouchBeganForTouchIndex(
int touchIndex,
IReadOnlyList <CommonTouch> touches,
Func <CommonTouch, CommonTouch, T> createGestureFunction)
{
var touch = touches[touchIndex];
if (!touch.isPhaseBegan ||
GestureTouchesUtility.IsFingerIdRetained(touch.fingerId) ||
GestureTouchesUtility.IsTouchOffScreenEdge(touch))
{
return;
}
for (var i = 0; i < touches.Count; i++)
{
if (i == touchIndex)
{
continue;
}
var otherTouch = touches[i];
// Prevents the same two touches from creating two gestures if both touches began on
// the same frame.
if (i < touchIndex && otherTouch.isPhaseBegan)
{
continue;
}
if (GestureTouchesUtility.IsFingerIdRetained(otherTouch.fingerId) ||
GestureTouchesUtility.IsTouchOffScreenEdge(otherTouch))
{
continue;
}
var gesture = createGestureFunction(touch, otherTouch);
AddGesture(gesture);
}
}
/// <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 both fingers are moving.
if (touch1.deltaPosition == Vector2.zero || touch2.deltaPosition == Vector2.zero)
{
return(false);
}
TwistGestureRecognizer twistRecognizer = m_Recognizer as TwistGestureRecognizer;
float rotation = CalculateDeltaRotation(
touch1.position, touch2.position, StartPosition1, StartPosition2);
if (Mathf.Abs(rotation) < twistRecognizer.m_SlopRotation)
{
return(false);
}
return(true);
}
#pragma warning restore IDE1006
/// <inheritdoc />
protected internal override bool CanStart()
{
if (GestureTouchesUtility.IsFingerIdRetained(fingerId))
{
Cancel();
return(false);
}
var touches = GestureTouchesUtility.touches;
if (touches.Count > 1)
{
foreach (var currentTouch in touches)
{
if (currentTouch.fingerId != fingerId &&
!GestureTouchesUtility.IsFingerIdRetained(currentTouch.fingerId))
{
return(false);
}
}
}
if (GestureTouchesUtility.TryFindTouch(fingerId, out var touch))
{
var pos = touch.position;
var diff = (pos - startPosition).magnitude;
if (GestureTouchesUtility.PixelsToInches(diff) >= dragRecognizer.slopInches)
{
return(true);
}
}
else
{
Cancel();
}
return(false);
}