private bool DropTransformOnto(Transform droppedTransform, HierarchyData target, HierarchyDataRoot newScene, Transform newParent, int newSiblingIndex, out bool decrementSiblingIndex, out bool shouldFocusObjectInHierarchy)
{
shouldFocusObjectInHierarchy = false;
decrementSiblingIndex = false;
// If we are only changing the sibling index of the dropped Transform and not its parent, then make sure
// that the target sibling index won't be affected when the dropped Transform is shifted in the Hierarchy
if (droppedTransform.parent == newParent)
{
if (newParent || (newScene is HierarchyDataRootScene && ((HierarchyDataRootScene)newScene).Scene == droppedTransform.gameObject.scene))
{
if (newSiblingIndex > droppedTransform.GetSiblingIndex())
{
newSiblingIndex--;
decrementSiblingIndex = true;
}
}
else if (newScene is HierarchyDataRootPseudoScene)
{
int pseudoSceneSiblingIndex = newScene.IndexOf(droppedTransform);
if (pseudoSceneSiblingIndex >= 0 && newSiblingIndex > pseudoSceneSiblingIndex)
{
newSiblingIndex--;
decrementSiblingIndex = true;
}
}
}
if (newParent) // Drop inside a Transform
{
if (!hierarchy.CanDropDraggedParentOnChild)
{
// Avoid setting child object as parent of the parent object
if (newParent.IsChildOf(droppedTransform))
{
return(false);
}
}
else
{
Transform curr = newParent;
while (curr.parent != null && curr.parent != droppedTransform)
{
curr = curr.parent;
}
// First, set the child object's parent as the dropped object's current parent so that
// the dropped object can then become a child of the former child object
if (curr.parent == droppedTransform)
{
HierarchyDataRootPseudoScene pseudoScene = target.Root as HierarchyDataRootPseudoScene;
int pseudoSceneChildIndex;
if (pseudoScene != null && (pseudoSceneChildIndex = pseudoScene.IndexOf(droppedTransform)) >= 0)
{
// Dropped object was a root pseudo-scene object, swap the child and parent objects in the pseudo-scene, as well
if (hierarchy.CanDropDraggedObjectsToPseudoScenes)
{
pseudoScene.InsertChild(pseudoSceneChildIndex, curr);
pseudoScene.RemoveChild(droppedTransform);
}
}
int siblingIndex = droppedTransform.GetSiblingIndex();
curr.SetParent(droppedTransform.parent, true);
curr.SetSiblingIndex(siblingIndex);
shouldFocusObjectInHierarchy = true;
}
}
droppedTransform.SetParent(newParent, true);
}
else // Drop at the root of a scene
{
if (newScene is HierarchyDataRootPseudoScene)
{
if (!hierarchy.CanDropDraggedObjectsToPseudoScenes)
{
return(false);
}
// Add object to pseudo-scene
if (newSiblingIndex < 0)
{
((HierarchyDataRootPseudoScene)newScene).AddChild(droppedTransform);
}
else
{
((HierarchyDataRootPseudoScene)newScene).InsertChild(newSiblingIndex, droppedTransform);
// Don't try to change the actual sibling index of the Transform
newSiblingIndex = -1;
target = newScene;
}
}
else if (newScene is HierarchyDataRootScene)
{
if (droppedTransform.parent != null)
{
droppedTransform.SetParent(null, true);
}
// Change dropped object's scene
Scene scene = ((HierarchyDataRootScene)newScene).Scene;
if (droppedTransform.gameObject.scene != scene)
{
SceneManager.MoveGameObjectToScene(droppedTransform.gameObject, scene);
}
if (newSiblingIndex < 0)
{
// If object was dropped onto the scene, add it to the bottom of the scene
newSiblingIndex = scene.rootCount + 1;
shouldFocusObjectInHierarchy = true;
}
}
}
if (newSiblingIndex >= 0)
{
droppedTransform.SetSiblingIndex(newSiblingIndex);
}
shouldFocusObjectInHierarchy |= (newSiblingIndex < 0 && !target.IsExpanded);
return(true);
}
void IDropHandler.OnDrop(PointerEventData eventData)
{
((IPointerExitHandler)this).OnPointerExit(eventData);
if (!hierarchy.CanReorganizeItems || hierarchy.IsInSearchMode)
{
return;
}
Transform droppedTransform = RuntimeInspectorUtils.GetAssignableObjectFromDraggedReferenceItem(eventData, typeof(Transform)) as Transform;
if (!droppedTransform)
{
return;
}
int newSiblingIndex = -1;
bool shouldFocusObjectInHierarchy = false;
float contentYPos = pointerLastYPos + content.anchoredPosition.y;
int dataIndex = (int)contentYPos / hierarchy.Skin.LineHeight;
HierarchyData target = hierarchy.GetDataAt(dataIndex);
if (target == null)
{
// Dropped object onto the blank space at the bottom of the Hierarchy
if (droppedTransform.parent == null)
{
return;
}
droppedTransform.SetParent(null, true);
shouldFocusObjectInHierarchy = true;
}
else
{
int insertDirection;
float relativePosition = contentYPos % hierarchy.Skin.LineHeight;
if (relativePosition < siblingIndexModificationArea)
{
insertDirection = -1;
}
else if (relativePosition > hierarchy.Skin.LineHeight - siblingIndexModificationArea)
{
insertDirection = 1;
}
else
{
insertDirection = 0;
}
// Inserting above/below a scene or pseudo-scene is a special case
if (insertDirection != 0 && !(target is HierarchyDataTransform))
{
if (insertDirection < 0 && dataIndex > 0)
{
// In Hierarchy AB, if inserting above B, then instead insert below A; it is easier for calculations
HierarchyData _target = hierarchy.GetDataAt(dataIndex - 1);
if (_target != null)
{
target = _target;
insertDirection = 1;
}
}
else if (insertDirection > 0 && dataIndex < hierarchy.ItemCount - 1)
{
// In Hierarchy AB, if inserting below A, then instead insert above B if B is a Transform; it is easier for calculations
HierarchyData _target = hierarchy.GetDataAt(dataIndex + 1);
if (_target != null && _target is HierarchyDataTransform)
{
target = _target;
insertDirection = -1;
}
}
}
HierarchyDataRoot newScene = null;
if (!(target is HierarchyDataTransform))
{
// Dropped onto a scene or pseudo-scene
newScene = (HierarchyDataRoot)target;
}
else
{
// Dropped onto a Transform
Transform newParent = ((HierarchyDataTransform)target).BoundTransform;
// Dropped onto itself, ignore
if (!newParent || droppedTransform == newParent)
{
return;
}
if (insertDirection != 0)
{
if (insertDirection > 0 && target.Height > 1)
{
// Dropped below an expanded Transform, make dropped object a child of it
newSiblingIndex = 0;
}
else if (target.Depth == 1 && target.Root is HierarchyDataRootPseudoScene)
{
// Dropped above or below a root pseudo-scene object, don't actually change the parent
if (insertDirection < 0)
{
newSiblingIndex = ((HierarchyDataRootPseudoScene)target.Root).IndexOf(newParent);
}
else
{
newSiblingIndex = ((HierarchyDataRootPseudoScene)target.Root).IndexOf(newParent) + 1;
}
newParent = null;
}
else
{
// Dropped above or below a regular Transform, calculate target sibling index
if (insertDirection < 0)
{
newSiblingIndex = newParent.GetSiblingIndex();
}
else
{
newSiblingIndex = newParent.GetSiblingIndex() + 1;
}
// To be able to drop the object at that sibling index, object's parent must also be changed
newParent = newParent.parent;
// If we are only changing the sibling index of the dropped Transform and not the parent, then make sure
// that the target sibling index won't be affected when the dropped Transform is shifted in the Hierarchy
if (newParent == droppedTransform.parent && (newParent || (target.Root is HierarchyDataRootScene && ((HierarchyDataRootScene)target.Root).Scene == droppedTransform.gameObject.scene)))
{
if (newSiblingIndex > droppedTransform.GetSiblingIndex())
{
newSiblingIndex--;
}
}
}
}
if (!newParent)
{
newScene = target.Root;
}
else
{
if (!canDropParentOnChild)
{
// Avoid setting child object as parent of the parent object
if (newParent.IsChildOf(droppedTransform))
{
return;
}
}
else
{
// First, set the child object's parent as dropped object's current parent so that
// the dropped object can then become a child of the former child object
Transform curr = newParent;
while (curr.parent != null && curr.parent != droppedTransform)
{
curr = curr.parent;
}
if (curr.parent == droppedTransform)
{
if (droppedTransform.parent == null && target.Root is HierarchyDataRootPseudoScene)
{
// Dropped object was a root pseudo-scene object, swap the child and parent objects in the pseudo-scene, as well
if (!canAddObjectsToPseudoScenes)
{
return;
}
HierarchyDataRootPseudoScene pseudoScene = (HierarchyDataRootPseudoScene)target.Root;
pseudoScene.InsertChild(pseudoScene.IndexOf(newParent), curr);
pseudoScene.RemoveChild(newParent);
}
int siblingIndex = droppedTransform.GetSiblingIndex();
curr.SetParent(droppedTransform.parent, true);
curr.SetSiblingIndex(siblingIndex);
shouldFocusObjectInHierarchy = true;
}
}
droppedTransform.SetParent(newParent, true);
}
}
if (newScene != null)
{
if (newScene is HierarchyDataRootPseudoScene)
{
if (!canAddObjectsToPseudoScenes)
{
return;
}
// Add object to pseudo-scene
if (newSiblingIndex < 0)
{
((HierarchyDataRootPseudoScene)newScene).AddChild(droppedTransform);
}
else
{
((HierarchyDataRootPseudoScene)newScene).InsertChild(newSiblingIndex, droppedTransform);
// Don't try to change the actual sibling index of the Transform
newSiblingIndex = -1;
target = newScene;
}
}
else if (newScene is HierarchyDataRootScene)
{
if (droppedTransform.parent != null)
{
droppedTransform.SetParent(null, true);
}
// Change dropped object's scene
Scene scene = ((HierarchyDataRootScene)newScene).Scene;
if (droppedTransform.gameObject.scene != scene)
{
SceneManager.MoveGameObjectToScene(droppedTransform.gameObject, scene);
}
if (newSiblingIndex < 0)
{
// If object was dropped onto the scene, add it to the bottom of the scene
newSiblingIndex = scene.rootCount + 1;
shouldFocusObjectInHierarchy = true;
}
}
}
if (newSiblingIndex >= 0)
{
droppedTransform.SetSiblingIndex(newSiblingIndex);
}
}
// Selecting the object in Hierarchy automatically expands collapsed parent entries and snaps the scroll view to the
// selected object. However, this snapping can be distracting, so don't select the object unless it is necessary
if (shouldFocusObjectInHierarchy || (newSiblingIndex < 0 && !target.IsExpanded))
{
hierarchy.Select(droppedTransform, true);
}
else
{
hierarchy.Refresh();
}
}