// Helper function that returns a Canvas GameObject; preferably a parent of the selection, or other existing Canvas.
static public GameObject GetOrCreateCanvasGameObject()
{
GameObject selectedGo = Selection.activeGameObject;
// Try to find a gameobject that is the selected GO or one if its parents.
Canvas canvas = (selectedGo != null) ? selectedGo.GetComponentInParent <Canvas>() : null;
if (IsValidCanvas(canvas))
{
return(canvas.gameObject);
}
// No canvas in selection or its parents? Then use any valid canvas.
// We have to find all loaded Canvases, not just the ones in main scenes.
// Canvas[] canvasArray = StageUtility.GetCurrentStageHandle().FindComponentsOfType<Canvas>();
// for (int i = 0; i < canvasArray.Length; i++)
// if (IsValidCanvas(canvasArray[i]))
// return canvasArray[i].gameObject;
Canvas canvas2 = UnityEngine.Object.FindObjectOfType <Canvas>();
if (IsValidCanvas(canvas2))
{
return(canvas2.gameObject);
}
// No canvas in the scene at all? Then create a new one.
return(MenuOptions.CreateNewUI());
}
static public void AddCanvas(MenuCommand menuCommand)
{
var go = MenuOptions.CreateNewUI();
MenuOptions.SetParentAndAlign(go, menuCommand.context as GameObject);
if (go.transform.parent as RectTransform)
{
RectTransform rect = go.transform as RectTransform;
rect.anchorMin = Vector2.zero;
rect.anchorMax = Vector2.one;
rect.anchoredPosition = Vector2.zero;
rect.sizeDelta = Vector2.zero;
}
Selection.activeGameObject = go;
}
private static void PlaceUIElementRoot(GameObject element, MenuCommand menuCommand)
{
GameObject parent = menuCommand.context as GameObject;
bool explicitParentChoice = true;
if (parent == null)
{
parent = GetOrCreateCanvasGameObject();
explicitParentChoice = false;
// // If in Prefab Mode, Canvas has to be part of Prefab contents,
// // otherwise use Prefab root instead.
// PrefabStage prefabStage = PrefabStageUtility.GetCurrentPrefabStage();
// if (prefabStage != null && !prefabStage.IsPartOfPrefabContents(parent))
// parent = prefabStage.prefabContentsRoot;
}
if (parent.GetComponentsInParent <Canvas>(true).Length == 0)
{
// Create canvas under context GameObject,
// and make that be the parent which UI element is added under.
GameObject canvas = MenuOptions.CreateNewUI();
Undo.SetTransformParent(canvas.transform, parent.transform, "");
parent = canvas;
}
GameObjectUtility.EnsureUniqueNameForSibling(element);
SetParentAndAlign(element, parent);
if (!explicitParentChoice) // not a context click, so center in sceneview
{
SetPositionVisibleinSceneView(parent.GetComponent <RectTransform>(), element.GetComponent <RectTransform>());
}
// This call ensure any change made to created Objects after they where registered will be part of the Undo.
Undo.RegisterFullObjectHierarchyUndo(parent == null ? element : parent, "");
// We have to fix up the undo name since the name of the object was only known after reparenting it.
Undo.SetCurrentGroupName("Create " + element.name);
Selection.activeGameObject = element;
}