// Find the next selectable object in the specified world-space direction.
public static Selectable FindNextSelectable(Selectable selectable, Transform transform, Vector3 direction)
{
RectTransform rectTransform = transform as RectTransform;
if (rectTransform == null)
{
return(null);
}
IList <Selectable> allSelectables;
int selectableCount;
#if UNITY_2019_PLUS
// Resize array as needed to fit all Selectables
if (Selectable.allSelectableCount > s_reusableAllSelectables.Length)
{
s_reusableAllSelectables = new Selectable[Selectable.allSelectableCount];
}
// Unity made a breaking API change in 2019.1.5 that removed the ref keyword. There is no clean way to catch it.
#if UNITY_2019_1_0 || UNITY_2019_1_1 || UNITY_2019_1_2 || UNITY_2019_1_3 || UNITY_2019_1_4 // 2019.1 up to 2019.1.4
selectableCount = Selectable.AllSelectablesNoAlloc(ref s_reusableAllSelectables);
allSelectables = s_reusableAllSelectables;
#else // all future versions
selectableCount = Selectable.AllSelectablesNoAlloc(ref s_reusableAllSelectables);
allSelectables = s_reusableAllSelectables;
#endif
#else // pre-2019 versions
allSelectables = Selectable.allSelectables;
selectableCount = allSelectables.Count;
#endif
direction.Normalize();
Vector2 localDir = direction;
Vector2 searchStartPos = Rewired.UI.ControlMapper.UITools.GetPointOnRectEdge(rectTransform, localDir); // search from point on rect edge from center out in direction
bool isHoriz = localDir == Vector2.right * -1f || localDir == Vector2.right;
float minCenterDistSqMag = Mathf.Infinity;
float minDirectLineSqMag = Mathf.Infinity;
Selectable bestCenterDistPick = null;
Selectable bestDirectLinePick = null;
const float length = 999999f; // Mathf.Infinity fails
Vector2 directLineCastEndPos = searchStartPos + localDir * length;
for (int i = 0; i < selectableCount; ++i)
{
Selectable targetSelectable = allSelectables[i];
if (targetSelectable == selectable || targetSelectable == null)
{
continue; // skip if self or null
}
if (targetSelectable.navigation.mode == Navigation.Mode.None)
{
continue; // skip if non-navigable
}
// Allow selection of non-interactable elements because it makes navigating easier and more predictable
// but the CanvasGroup interactable value is private in Selectable
#if !UNITY_WSA
// Reflect to get group intaractability if non-interactable
bool canvasGroupAllowsInteraction = targetSelectable.IsInteractable() || Rewired.Utils.ReflectionTools.GetPrivateField <Selectable, bool>(targetSelectable, "m_GroupsAllowInteraction");
if (!canvasGroupAllowsInteraction)
{
continue; // skip if disabled by canvas group, otherwise allow it
}
#else
// Can't do private field reflection in Metro
if (!targetSelectable.IsInteractable())
{
continue; // skip if disabled
}
#endif
var targetSelectableRectTransform = targetSelectable.transform as RectTransform;
if (targetSelectableRectTransform == null)
{
continue;
}
// Check direct line cast from center edge of object in direction pressed
float directLineSqMag;
Rect targetSelecableRect = UITools.InvertY(UITools.TransformRectTo(targetSelectableRectTransform, transform, targetSelectableRectTransform.rect));
// Check for direct line rect intersection
if (Rewired.Utils.MathTools.LineIntersectsRect(searchStartPos, directLineCastEndPos, targetSelecableRect, out directLineSqMag))
{
if (isHoriz)
{
directLineSqMag *= 0.25f; // give extra bonus to horizontal directions because most of the UI groups are laid out horizontally
}
if (directLineSqMag < minDirectLineSqMag)
{
minDirectLineSqMag = directLineSqMag;
bestDirectLinePick = targetSelectable;
}
}
// Check distance to center
Vector2 targetSelectableCenter = Rewired.Utils.UnityTools.TransformPoint(targetSelectableRectTransform, transform, targetSelectableRectTransform.rect.center);
Vector2 searchPosToTargetSelectableCenter = targetSelectableCenter - searchStartPos;
const float maxSafeAngle = 75.0f;
// Get the angle the target center deviates from straight
float angle = Mathf.Abs(Vector2.Angle(localDir, searchPosToTargetSelectableCenter));
if (angle > maxSafeAngle)
{
continue; // only consider if within a reasonable angle of the desired direction
}
float score = searchPosToTargetSelectableCenter.sqrMagnitude;
// Lower score is better
if (score < minCenterDistSqMag)
{
minCenterDistSqMag = score;
bestCenterDistPick = targetSelectable;
}
}
// Choose between direct line and center dist
if (bestDirectLinePick != null && bestCenterDistPick != null)
{
if (minDirectLineSqMag > minCenterDistSqMag)
{
return(bestCenterDistPick);
}
return(bestDirectLinePick);
}
#if UNITY_2019_PLUS
System.Array.Clear(s_reusableAllSelectables, 0, s_reusableAllSelectables.Length);
#endif
return(bestDirectLinePick ?? bestCenterDistPick);
}
public void SelectFirstSelectable()
{
tempSelectables.Clear();
//var selectables = Selectable.allSelectables;Selectable.al
#if UNITY_2019_1_OR_NEWER
#if UNITY_2019_1_0 || UNITY_2019_1_1 || UNITY_2019_1_2 || UNITY_2019_1_3 || UNITY_2019_1_4
var count = Selectable.AllSelectablesNoAlloc(ref tempSelectablesArray);
#else
var count = Selectable.AllSelectablesNoAlloc(tempSelectablesArray);
#endif
for (var i = 0; i < count; i++)
{
tempSelectables.Add(tempSelectablesArray[i]);
}
#else
tempSelectables.AddRange(Selectable.allSelectables);
#endif
// Select from history?
for (var i = SelectionHistory.Count - 1; i >= 0; i--) // NOTE: Property
{
var oldSelection = selectionHistory[i];
if (oldSelection != null)
{
if (CanSelect(oldSelection) == true && tempSelectables.Contains(oldSelection) == true)
{
selectionHistory.RemoveRange(i, selectionHistory.Count - i);
oldSelection.Select();
return;
}
}
else
{
selectionHistory.RemoveAt(i);
}
}
var bestSelectable = default(Selectable);
var bestPriority = -1.0f;
// Select from selectables?
for (var i = 0; i < tempSelectables.Count; i++)
{
var selectable = tempSelectables[i];
if (CanSelect(selectable) == true)
{
var selectionPriority = selectable.GetComponent <LeanSelectionPriority>();
var priority = 0.0f;
if (selectionPriority != null)
{
priority = selectionPriority.Priority;
}
if (priority > bestPriority)
{
bestSelectable = selectable;
bestPriority = priority;
}
}
}
if (bestSelectable != null)
{
bestSelectable.Select();
}
}