private bool TryEndDragOrDetectClickOrTap()
{
if (CanEndDrag())
{
if (IsDragging)
{
IsDragging = false;
OnEndDrag.Dispatch(LastDragPosition);
DebugLog(type + "End drag");
return(true);
}
else if (IsAttemptingDrag)
{
IsAttemptingDrag = false;
if (CanTriggerPrimaryAction())
{
OnPrimaryAction.Dispatch(LastDragPosition);
}
DebugLog(type + "End drag with click or tap");
return(true);
}
}
return(false);
}
private bool TryDrag()
{
if (IsDragging)
{
Vector2 currentPosition = GetScreenPosition();
// Check if mouse or touch has moved since last frame
if (currentPosition != LastDragPosition)
{
OnDrag.Dispatch(GetScreenPosition());
LastDragPosition = currentPosition;
DebugLog(type + "Dragging");
}
// Want to block if dragging, whether a displacement was made or not
return(true);
}
return(false);
}
private bool TryStartClickTapOrDrag()
{
Assert.IsFalse(IsDragging); // IsDragging here is irrelevant based on Update ordering
if (IsAttemptingDrag)
{
LastDragPosition = GetScreenPosition();
float distanceFromStart = (LastDragPosition - DragStartPosition).magnitude;
if (distanceFromStart >= DragThresholdInPixels)
{
IsDragging = true;
IsAttemptingDrag = false;
OnStartDrag.Dispatch(LastDragPosition);
DebugLog(type + "Started drag");
return(true);
}
}
else if (CanStartDrag())
{
Vector2 screenPosition = GetScreenPosition();
if (DisableOverUI && IsPositionOverUI(screenPosition))
{
return(true);
}
IsAttemptingDrag = true;
DragStartPosition = screenPosition;
DebugLog(type + "Attempting to start drag");
return(true);
}
return(false);
}