/// <summary>
/// New version of ShouldStartDrag implemented first in PointerInputModule. This version differs in that
/// for ray based pointers it makes a decision about whether a drag should start based on the angular change
/// the pointer has made so far, as seen from the camera. This also works when the world space ray is
/// translated rather than rotated, since the beginning and end of the movement are considered as angle from
/// the same point.
/// </summary>
private bool ShouldStartDrag(PointerEventData pointerEvent)
{
if (!pointerEvent.useDragThreshold)
{
return(true);
}
if (!pointerEvent.IsSyncVRPointer())
{
// Same as original behaviour for canvas based pointers
return((pointerEvent.pressPosition - pointerEvent.position).sqrMagnitude >= eventSystem.pixelDragThreshold * eventSystem.pixelDragThreshold);
}
else
{
#if UNITY_ANDROID && !UNITY_EDITOR // On android allow swiping to start drag
if (useSwipeScroll && ((Vector3)pointerEvent.SyncVRGetSwipeStart() - Input.mousePosition).magnitude > swipeDragThreshold)
{
return(true);
}
#endif
// When it's not a screen space pointer we have to look at the angle it moved rather than the pixels distance
// For gaze based pointing screen-space distance moved will always be near 0
Vector3 cameraPos = pointerEvent.pressEventCamera.transform.position;
Vector3 pressDir = (pointerEvent.pointerPressRaycast.worldPosition - cameraPos).normalized;
Vector3 currentDir = (pointerEvent.pointerCurrentRaycast.worldPosition - cameraPos).normalized;
return(Vector3.Dot(pressDir, currentDir) < Mathf.Cos(Mathf.Deg2Rad * (angleDragThreshold)));
}
}
/// <summary>
/// The purpose of this function is to allow us to switch between using the standard IsPointerMoving
/// method for mouse driven pointers, but to always return true when it's a ray based pointer.
/// All real-world ray-based input devices are always moving so for simplicity we just return true
/// for them.
///
/// If PointerEventData.IsPointerMoving was virtual we could just override that in
/// OVRRayPointerEventData.
/// </summary>
/// <param name="pointerEvent"></param>
/// <returns></returns>
static bool IsPointerMoving(PointerEventData pointerEvent)
{
if (pointerEvent.IsSyncVRPointer())
{
return(true);
}
else
{
return(pointerEvent.IsPointerMoving());
}
}
/// <summary>
/// Exactly the same as the code from PointerInputModule, except that we call our own
/// IsPointerMoving.
///
/// This would also not be necessary if PointerEventData.IsPointerMoving was virtual
/// </summary>
/// <param name="pointerEvent"></param>
protected override void ProcessDrag(PointerEventData pointerEvent)
{
Vector2 originalPosition = pointerEvent.position;
bool moving = IsPointerMoving(pointerEvent);
if (moving && pointerEvent.pointerDrag != null &&
!pointerEvent.dragging &&
ShouldStartDrag(pointerEvent))
{
if (pointerEvent.IsSyncVRPointer())
{
//adjust the position used based on swiping action. Allowing the user to
//drag items by swiping on the GearVR touchpad
pointerEvent.position = SwipeAdjustedPosition(originalPosition, pointerEvent);
}
ExecuteEvents.Execute(pointerEvent.pointerDrag, pointerEvent, ExecuteEvents.beginDragHandler);
pointerEvent.dragging = true;
}
// Drag notification
if (pointerEvent.dragging && moving && pointerEvent.pointerDrag != null)
{
if (pointerEvent.IsSyncVRPointer())
{
pointerEvent.position = SwipeAdjustedPosition(originalPosition, pointerEvent);
}
// Before doing drag we should cancel any pointer down state
// And clear selection!
if (pointerEvent.pointerPress != pointerEvent.pointerDrag)
{
ExecuteEvents.Execute(pointerEvent.pointerPress, pointerEvent, ExecuteEvents.pointerUpHandler);
pointerEvent.eligibleForClick = false;
pointerEvent.pointerPress = null;
pointerEvent.rawPointerPress = null;
}
ExecuteEvents.Execute(pointerEvent.pointerDrag, pointerEvent, ExecuteEvents.dragHandler);
}
}
/// <summary>
/// Perform a raycast using the worldSpaceRay in eventData.
/// </summary>
/// <param name="eventData"></param>
/// <param name="resultAppendList"></param>
public override void Raycast(PointerEventData eventData, List <RaycastResult> resultAppendList)
{
// This function is closely based on PhysicsRaycaster.Raycast
if (eventCamera == null)
{
return;
}
if (!eventData.IsSyncVRPointer())
{
return;
}
var ray = eventData.SyncVRGetRay();
float dist = eventCamera.farClipPlane - eventCamera.nearClipPlane;
var hits = Physics.RaycastAll(ray, dist, finalEventMask);
if (hits.Length > 1)
{
System.Array.Sort(hits, (r1, r2) => r1.distance.CompareTo(r2.distance));
}
if (hits.Length != 0)
{
for (int b = 0, bmax = hits.Length; b < bmax; ++b)
{
var result = new RaycastResult
{
gameObject = hits[b].collider.gameObject,
module = this,
distance = hits[b].distance,
index = resultAppendList.Count,
worldPosition = hits[0].point,
worldNormal = hits[0].normal,
};
resultAppendList.Add(result);
}
}
}
