/// <summary>
/// Executes the action.
/// </summary>
public void Execute()
{
if (_gameObjects.Count != 0)
{
// Take a snapshot to allow for undo
_preChangeMaskSnapshot = new ObjectSelectionMaskSnapshot();
_preChangeMaskSnapshot.TakeSnapshot();
// Assign the objects to the selection mask.
// Note: We will also perform a snapshot of the current object selection just in case
// the object selection changes after the objects are assigned to the mask.
_preChangeSelectionSnapshot = new ObjectSelectionSnapshot();
_preChangeSelectionSnapshot.TakeSnapshot();
EditorObjectSelection editorObjectSelection = EditorObjectSelection.Instance;
_selectionWasChanged = editorObjectSelection.AddGameObjectCollectionToSelectionMask(_gameObjects);
// If the selection was changed, we will perform a snapshot post change to make sure that we
// can undo and redo the action accordingly. For example, if assigning the objects to the mask
// caused a selection change, when the operation is undone, we want to restore both the mask
// and the state that the selection was in before the mask was updated.
if (_selectionWasChanged)
{
_postChangeSelectionSnapshot = new ObjectSelectionSnapshot();
_postChangeSelectionSnapshot.TakeSnapshot();
}
// Take a snapshot to allow for redo
_postChangeMaskSnapshot = new ObjectSelectionMaskSnapshot();
_postChangeMaskSnapshot.TakeSnapshot();
ObjectsAddedToSelectionMaskMessage.SendToInterestedListeners(_gameObjects);
EditorUndoRedoSystem.Instance.RegisterAction(this);
}
}
/// <summary>
/// Convenience function for sending an objects added to selection mask message to
/// all interested listeners.
/// </summary>
/// <param name="gameObjects">
/// The game objects which were added to the selection mask.
/// </param>
public static void SendToInterestedListeners(List <GameObject> gameObjects)
{
var message = new ObjectsAddedToSelectionMaskMessage(gameObjects);
MessageListenerDatabase.Instance.SendMessageToInterestedListeners(message);
}