void HandleDragPerformEvent(Editor[] editors, Event evt, ref int targetIndex)
{
if (targetIndex != -1)
{
var draggingMode = DragAndDrop.GetGenericData(k_DraggingModeKey) as DraggingMode ? ;
if (!draggingMode.HasValue || draggingMode.Value == DraggingMode.NotApplicable)
{
targetIndex = -1;
return;
}
if (!editors[targetIndex].targets.All(t => t is Component))
{
return;
}
var targetComponents = editors[targetIndex].targets.Cast <Component>().ToArray();
if (draggingMode.Value == DraggingMode.Script)
{
var scripts = DragAndDrop.objectReferences.Cast <MonoScript>();
// Ensure all script components can be added
var valid = true;
foreach (var targetComponent in targetComponents)
{
var gameObject = targetComponent.gameObject;
if (scripts.Any(s => !ComponentUtility.WarnCanAddScriptComponent(gameObject, s)))
{
valid = false;
break;
}
}
if (valid)
{
Undo.IncrementCurrentGroup();
var undoGroup = Undo.GetCurrentGroup();
// Add script components
var index = 0;
var addedComponents = new Component[targetComponents.Length * scripts.Count()];
for (int i = 0; i < targetComponents.Length; i++)
{
var targetComponent = targetComponents[i];
var gameObject = targetComponent.gameObject;
bool targetIsTransform = targetComponent is Transform;
foreach (var script in scripts)
{
addedComponents[index++] = ObjectFactory.AddComponent(gameObject, script.GetClass());
}
// If the target is a Transform, the AddComponent might have replaced it with a RectTransform.
// Handle this possibility by updating the target component.
if (targetIsTransform)
{
targetComponents[i] = gameObject.transform;
}
}
// Move added components relative to target components
if (!ComponentUtility.MoveComponentsRelativeToComponents(addedComponents, targetComponents, m_TargetAbove))
{
// Ensure we have the same selection after calling RevertAllDownToGroup below (MoveComponentsRelativeToComponents can have opened a Prefab in Prefab Mode and changed selection to that root)
var wantedSelectedGameObject = Selection.activeGameObject;
// Revert added components if move operation fails (e.g. user has been shown the dialog with 'prefab instance restructuring is not posssible' or object is not editable)
Undo.RevertAllDownToGroup(undoGroup);
if (wantedSelectedGameObject != Selection.activeGameObject)
{
Selection.activeGameObject = wantedSelectedGameObject;
}
}
}
}
else
{
// Handle dragging components
var sourceComponents = DragAndDrop.objectReferences.Cast <Component>().ToArray();
if (sourceComponents.Length == 0 || targetComponents.Length == 0)
{
return;
}
MoveOrCopyComponents(sourceComponents, targetComponents, EditorUtility.EventHasDragCopyModifierPressed(evt), false);
}
targetIndex = -1;
DragAndDrop.AcceptDrag();
evt.Use();
EditorGUIUtility.ExitGUI();
}
}