using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.Events;
using UnityEditor;
using UnityEditor.SceneManagement;
using System.Collections.Generic;

using Flux;

namespace FluxEditor
{
	[System.Serializable]
	public class FSequenceEditor : FEditorList<FContainerEditor>
	{
		private const double NOTIFY_DIRTY_TRACKS_DELTA = 1;

		private const int VERTICAL_SCROLLER_WIDTH = 16;

		public const int RIGHT_BORDER = 20;

		private const int FRAME_RANGE_SCROLLER_HEIGHT = 16;

		private const int MINIMUM_HEADER_WIDTH = 150;

		private const int SCROLL_WHEEL_SPEED = 5;

		// keep track if we came out of play mode
		private bool _wasUnityInPlaymode = false;

		[SerializeField]
		private Editor _renderingOnEditor;
		[SerializeField]
		private EditorWindow _renderingOnEditorWindow;

		private int _headerResizerGuiId = 0;

		// current view range of the sequence
		[SerializeField]
		private FrameRange _viewRange;
		public FrameRange ViewRange { get { return _viewRange; } }

		// cached sequence.Length, to know when it got chanced
		// and adjust the _viewRange accordingly
		private int _sequenceLength = int.MaxValue;

		// how many pixels do we have to render per frame
		private float _pixelsPerFrame;
		public float PixelsPerFrame { get { return _pixelsPerFrame; } }

		// editor cache
		[SerializeField]
		private FEditorCache _editorCache = null;

		// sequence being edited
		public FSequence Sequence { get { return (FSequence)Obj; } }

		[SerializeField]
		private FTrackEditorInspector _trackSelection = new FTrackEditorInspector();
		public FTrackEditorInspector TrackSelection { get { return _trackSelection; } }

		[SerializeField]
		private FEventEditorInspector _eventSelection = new FEventEditorInspector();
		public FEventEditorInspector EventSelection { get { return _eventSelection; } }

		[SerializeField]
		private FTimelineEditorInspector _timelineSelection = new FTimelineEditorInspector();
		public FTimelineEditorInspector TimelineSelection { get { return _timelineSelection; } }

		[SerializeField]
		private FContainerEditorInspector _containerSelection = new FContainerEditorInspector();
		public FContainerEditorInspector ContainerSelection { get { return _containerSelection; } }


		public override void Init( FObject obj, FEditor owner )
		{
			base.Init( obj, owner );

			Editors.Clear();
			if( Sequence != null )
			{
				for( int i = 0; i != Sequence.Containers.Count; ++i )
				{
					FContainerEditor editor = _editorCache.GetEditor<FContainerEditor>( Sequence.Containers[i] );
					editor.Init( Sequence.Containers[i], this );
					Editors.Add( editor );
				}
			}

			_contentOffset.x = 0; // no left margin, and Y offset needs to be calculated based on scroll
		}

		public override FSequenceEditor SequenceEditor { get { return this; } }

		#region Cached rects to speed up render and not use GUILayout
		// rect for the scroll bar on the left
		[SerializeField]
		private Rect _verticalScrollerRect;

		// rect where the timelines will be displayed
		[SerializeField]
		private Rect _viewRect;

		// rect for the view range bar
		[SerializeField]
		private Rect _viewRangeRect;

		// rect for the time scrubber
		[SerializeField]
		private Rect _timeScrubberRect;

		// origin-starting rect for the sequence timelines, to be used
		// inside the GUI.BeginGroup
		[SerializeField]
		private Rect _sequenceRect;

		[SerializeField]
		private Rect _timelineRect;

		// rect of the area where the timeline headers are
		[SerializeField]
		private Rect _timelineHeaderResizerRect;

		// width of the timeline header
		[SerializeField]
		private float _headerWidth;
		public float HeaderWidth { get { return _headerWidth; } }
	
		// timeline scroll bar pos, only handles Y
		[SerializeField]
		private Vector2 _scrollPos;

		public FEditor EditorDragged { get; set; }
		public Rect EditorDraggedRect { get; set; }

		#endregion

		[SerializeField]
		private UnityEvent _onUpdateEvent = new UnityEvent();
		public UnityEvent OnUpdateEvent { get { return _onUpdateEvent; } }

		private bool _isEditorCompiling = false;

		protected override void OnEnable()
		{
			base.OnEnable();
			EditorApplication.hierarchyWindowChanged += Refresh;
			AnimationUtility.onCurveWasModified += OnAnimationCurveChanged;

			Undo.undoRedoPerformed += OnUndo;
			Undo.postprocessModifications += PostProcessModifications;

			EditorApplication.playmodeStateChanged += OnPlaymodeChanged;

			EditorSceneManager.sceneUnloaded += OnSceneUnloaded;
		}
		private double _timeNotifyDirtyTracks = 0;
		void OnAnimationCurveChanged( AnimationClip clip, EditorCurveBinding binding, AnimationUtility.CurveModifiedType curveModifiedType )
		{
//			Debug.LogWarning( "OnAnimationCurveChanged" );
			SetAllDirty();
		}

		protected override void OnDestroy()
		{
			base.OnDestroy();
			EventSelection.Clear();
			TrackSelection.Clear();
			TimelineSelection.Clear();
			ContainerSelection.Clear();

			if( _editorCache != null )
			{
				_editorCache.Clear();
				DestroyImmediate( _editorCache );
			}

			EditorApplication.hierarchyWindowChanged -= Refresh;

			AnimationUtility.onCurveWasModified -= OnAnimationCurveChanged;

			Undo.undoRedoPerformed -= OnUndo;
			Undo.postprocessModifications -= PostProcessModifications;

			EditorApplication.playmodeStateChanged -= OnPlaymodeChanged;

			EditorSceneManager.sceneUnloaded -= OnSceneUnloaded;
		}

		private void OnSceneUnloaded(Scene scene)
		{
			if( Sequence != null && Sequence.gameObject.scene == scene )
			{
				OpenSequence(null);
			}
		}

		protected override bool CanPaste(FObject obj)
		{
			return obj is FContainer;
		}

		protected override void Paste(object obj)
		{
			Undo.RecordObject( Sequence, string.Empty );

			FContainer container = Instantiate<FContainer>((FContainer)obj);
			container.hideFlags = Sequence.Content.hideFlags;
			Sequence.Add( container );
			Undo.RegisterCreatedObjectUndo( container.gameObject, "Paste Container " + ((FContainer)obj).name );
		}

		public void Init( Editor editor )
		{
			Init( editor, null );
		}

		public void Init( EditorWindow editorWindow )
		{
			Init( null, editorWindow );
		}

		private void Init( Editor editor, EditorWindow editorWindow )
		{
			_renderingOnEditor = editor;
			_renderingOnEditorWindow = editorWindow;

			_editorCache = CreateInstance<FEditorCache>();
		}

		public void Repaint()
		{
			if( _renderingOnEditor )
				_renderingOnEditor.Repaint();
			else if( _renderingOnEditorWindow )
				_renderingOnEditorWindow.Repaint();
		}

		public void Refresh()
		{
			OpenSequence( Sequence );
		}

		public T GetEditor<T>( FObject obj ) where T : FEditor
		{
			return _editorCache.GetEditor<T>( obj );
		}

		public void OnUndo()
		{
			_editorCache.Refresh();

			if( FInspectorWindow._instance )
			{
				EventSelection.Refresh();
				TrackSelection.Refresh();
				TimelineSelection.Refresh();
				ContainerSelection.Refresh();
				FInspectorWindow._instance.Repaint();
			}

			OpenSequence( Sequence );
			
			SetAllDirty();
			
			if( Sequence && !Sequence.IsStopped )
			{
				int currentFrame = Sequence.CurrentFrame;
				Stop();
				SetCurrentFrame( currentFrame );
			}
		}

		UndoPropertyModification[] PostProcessModifications( UndoPropertyModification[] modifications )
		{
			foreach( UndoPropertyModification modification in modifications )
			{
				FTrack track = null;

				PropertyModification propertyModification = modification.currentValue;

				if( propertyModification.target is FEvent )

				if( propertyModification.target is FEvent )
				{
					track = ((FEvent)propertyModification.target).Track;
				}
				else if( propertyModification.target is FTrack )
				{
					track = (FTrack)propertyModification.target;
				}
				
				if( track != null && track.Sequence == Sequence )
				{
					FTrackEditor trackEditor = GetEditor<FTrackEditor>( track );
					SetDirty( trackEditor );
				}
			}

			return modifications;
		}

		public void OnPlaymodeChanged()
		{
			if( _wasUnityInPlaymode )
			{
				// make sure it is like it is opening it for the first time
				_wasUnityInPlaymode = false;
				FSequence sequence = Sequence;
				OpenSequence( null );
				OpenSequence( sequence );
			}
		}

		public void OnPlaymodeWillChange()
		{
			Stop();

			foreach( FContainerEditor container in Editors )
			{
				List<FTimelineEditor> timelineEditors = container.Editors;

				for( int i = 0; i != timelineEditors.Count; ++i )
				{
					for( int j = 0; j != timelineEditors[i].Editors.Count; ++j )
					{
						if( timelineEditors[i].Editors[j].Track.HasCache )
						{
							timelineEditors[i].Editors[j].Track.ClearCache();
						}
					}
				}
			}

			FAnimationTrack.DeleteAnimationPreviews( Sequence );

			_editorCache.Refresh();
			EventSelection.Refresh();
			TrackSelection.Refresh();
			TimelineSelection.Refresh();
			ContainerSelection.Refresh();

			Repaint();
		}

		public void SetViewRange( FrameRange viewRange )
		{
			FrameRange sequenceRange = new FrameRange(0, Sequence.Length);
			viewRange.Start = sequenceRange.Cull( viewRange.Start );
			viewRange.End = sequenceRange.Cull( viewRange.End );

			if( viewRange.End <= viewRange.Start )
			{
				if( viewRange.Start == Sequence.Length )
				{
					viewRange.End = Sequence.Length;
					viewRange.Start = viewRange.End-1;
				}
				else
				{
					viewRange.End = viewRange.Start+1;
				}
			}

			_viewRange = viewRange;
		}

		/**
		 * @brief Returns the mouse x normalized to the start of the timeline, so 0 = viewRange.Start
		 * @param frame Frame.
		 */
		public float GetXForFrame( int frame )
		{
			return ((frame - _viewRange.Start) * _pixelsPerFrame);
		}

		/**
		 * @brief Get frame for x, normalized to the start of timeline, so 0 = viewRange.Start
		 * @param x Position.
		 */
		public int GetFrameForX( float x )
		{
			return _viewRange.Start + Mathf.RoundToInt( x / _pixelsPerFrame );
		}

		protected override string HeaderText { get { return null; } }

		protected override Transform ContentTransform { get { return Sequence.Content; } }

		public override void Render( Rect rect, float headerWidth )
		{
			RenderList( rect, headerWidth );
		}

		public void RebuildLayout( Rect rect )
		{
			Rect = rect;

			_viewRect = rect;
			_viewRect.xMin += VERTICAL_SCROLLER_WIDTH;
			_viewRect.yMax -= (FRAME_RANGE_SCROLLER_HEIGHT + FGUI.TIMELINE_SCRUBBER_HEIGHT);

			_sequenceRect = _viewRect;
			_sequenceRect.xMin -= VERTICAL_SCROLLER_WIDTH;
			_sequenceRect.xMax -= VERTICAL_SCROLLER_WIDTH + RIGHT_BORDER;

			_timelineRect = _sequenceRect;
			_timelineRect.xMin += _headerWidth;

			_headerWidth = Mathf.Max(MINIMUM_HEADER_WIDTH, _headerWidth);

			_timeScrubberRect = _viewRect;
			_timeScrubberRect.xMin += _headerWidth;
			_timeScrubberRect.xMax -= RIGHT_BORDER;
			_timeScrubberRect.yMax += FGUI.TIMELINE_SCRUBBER_HEIGHT;

			_timelineHeaderResizerRect = _timeScrubberRect;
			_timelineHeaderResizerRect.xMin = 0;
			_timelineHeaderResizerRect.xMax = _timeScrubberRect.xMin;
			_timelineHeaderResizerRect.yMin = _timelineHeaderResizerRect.yMax-FGUI.TIMELINE_SCRUBBER_HEIGHT;

			_viewRangeRect = rect;
			_viewRangeRect.yMin = _viewRangeRect.yMax - FRAME_RANGE_SCROLLER_HEIGHT;

			_verticalScrollerRect = rect;
			_verticalScrollerRect.width = VERTICAL_SCROLLER_WIDTH;
			_verticalScrollerRect.yMax -= (FRAME_RANGE_SCROLLER_HEIGHT + FGUI.TIMELINE_SCRUBBER_HEIGHT);
		}

		public void OpenSequence( FSequence sequence )
		{
#if FLUX_DEBUG
			Debug.Log( "Opening sequence: " + sequence + " isPlaying " + EditorApplication.isPlaying + " isPlayingOrEtc " + EditorApplication.isPlayingOrWillChangePlaymode );
#endif
			if( sequence == null )
			{
				if( !object.Equals( sequence, null ) )
					sequence = (FSequence)EditorUtility.InstanceIDToObject( sequence.GetInstanceID() );
			}

			bool sequenceChanged = Sequence != sequence && (object.Equals(Sequence, null) || object.Equals(sequence, null) || Sequence.GetInstanceID() != sequence.GetInstanceID());

			if( sequenceChanged || sequence == null )
			{
				if( Sequence != null )
				{
					Stop();
					Sequence.DestroyTrackCaches();
				}

				OnUpdateEvent.RemoveAllListeners();

				_editorCache.Clear();
				EventSelection.Clear();
				TrackSelection.Clear();
				TimelineSelection.Clear();
				ContainerSelection.Clear();
				Editors.Clear();

				if( sequence != null )
					sequence.Speed = sequence.DefaultSpeed;
			}
			else if( !EditorApplication.isPlaying )
			{
				_editorCache.Refresh();
				EventSelection.Refresh();
				TrackSelection.Refresh();
				TimelineSelection.Refresh();
				ContainerSelection.Refresh();
			}


			if( sequence != null )
			{
				if( !EditorApplication.isPlaying && sequence.Version != Flux.FUtility.FLUX_VERSION )
				{
					FluxEditor.FUtility.Upgrade( sequence );
				}

				if( _viewRange.Length == 0 )
					_viewRange = new FrameRange(0, sequence.Length);

				if( !EditorApplication.isPlaying )
					sequence.Rebuild();

				if( _viewRange.Length == 0 )
				{
					_viewRange = new FrameRange(0, sequence.Length);
				}
			}
			else
			{
				_dirtyTracks.Clear();
			}

			Init( sequence, null );

			if( !Application.isPlaying && sequenceChanged )
			{
				sequence.Init();

                sequence.ResetDefaultVal();
            }
			
			Repaint();

			if( FInspectorWindow._instance != null )
				FInspectorWindow._instance.Repaint();
		}

		public void CreateContainer( FColorSetting containerInfo )
		{
			Undo.RecordObject( Sequence, null );

			FContainer container = FContainer.Create( containerInfo._color );
			container.gameObject.name = GetUniqueContainerName( containerInfo._str );
			Sequence.Add( container );
			Undo.RegisterCreatedObjectUndo( container.gameObject, "create Container" );
		}

		private bool HasContainerWithName( string name )
		{
			foreach( FContainer container in Sequence.Containers )
			{
				if( container.gameObject.name == name )
					return true;
			}
			
			return false;
		}

		public string GetUniqueContainerName( string defaultName )
		{
			if( !HasContainerWithName( defaultName ) )
				return defaultName;

			string nameFormat = defaultName + " {0}";
			int id = 1;
			while( HasContainerWithName( string.Format( nameFormat, id ) ) )
			{
				++id;
			}

			return string.Format( nameFormat, id );
		}

		public void DestroyEditor( FEditor editor )
		{
			if( editor is FEventEditor )
			{
				List<FEventEditor> eventEditors = new List<FEventEditor>();
				eventEditors.Add( (FEventEditor)editor );
				DestroyEvents( eventEditors );
			}
			else if( editor is FTrackEditor )
			{
				DestroyEditor( (FTrackEditor)editor );
			}
			else if( editor is FTimelineEditor )
			{
				DestroyEditor( (FTimelineEditor)editor );
			}
			else if( editor is FContainerEditor )
			{
				DestroyEditor( (FContainerEditor)editor );
			}
		}

		public void DestroyEditor( FContainerEditor editor )
		{
			FContainer container = editor.Container;

			int undoGroup = Undo.GetCurrentGroup();
			Undo.SetCurrentGroupName( "delete Container" );

			Undo.RecordObjects( new Object[]{Sequence, container, editor, _editorCache, this}, "delete Container" );

			editor.OnDelete();

			editor.SequenceEditor.Editors.Remove( editor );

			_editorCache.Remove( editor );
			ContainerSelection.Remove( editor );

			Undo.SetTransformParent( container.transform, null, null );
			Sequence.Remove( container );

			while( editor.Editors.Count > 0 )
			{
				DestroyEditor( editor.Editors[editor.Editors.Count-1] );
			}

			Undo.DestroyObjectImmediate( editor );
			Undo.DestroyObjectImmediate( container.gameObject );

			Undo.CollapseUndoOperations( undoGroup );
		}

		public void DestroyEditor( FTrackEditor editor )
		{
			FTrack track = editor.Track;

			int undoGroup = Undo.GetCurrentGroup();
			Undo.SetCurrentGroupName( "delete Track" );

			Undo.RecordObjects( new UnityEngine.Object[]{track.Timeline, editor.TimelineEditor, track, editor, _editorCache, this}, "delete Track" );

			editor.OnDelete();

			editor.TimelineEditor.Editors.Remove( editor );

			_editorCache.Remove( editor );
			TrackSelection.Remove( editor );
			Undo.SetTransformParent( track.transform, null, null );
			
			track.Timeline.Remove( track );

			DestroyEvents( editor._eventEditors );

			Undo.DestroyObjectImmediate( editor );
			Undo.DestroyObjectImmediate( track.gameObject );

			Undo.CollapseUndoOperations( undoGroup );
		}

		public void DestroyEditor( FTimelineEditor editor )
		{
			FTimeline timeline = editor.Timeline;

			int undoGroup = Undo.GetCurrentGroup();
			Undo.SetCurrentGroupName( "delete Timeline" );

			Undo.RecordObjects( new UnityEngine.Object[]{timeline.Container, editor.ContainerEditor, timeline, editor, _editorCache, this}, "delete Timeline" );

			editor.OnDelete();

			while( editor.Editors.Count > 0 )
			{
				DestroyEditor( editor.Editors[editor.Editors.Count-1] );
			}

			editor.ContainerEditor.Editors.Remove( editor );
			_editorCache.Remove( editor );
			TimelineSelection.Remove( editor );
			Undo.SetTransformParent( timeline.transform, null, null );

			timeline.Container.Remove( timeline );

			Undo.DestroyObjectImmediate( editor );
			Undo.DestroyObjectImmediate( timeline.gameObject );

			Undo.CollapseUndoOperations( undoGroup );
		}

		protected override void Delete()
		{
			// cannot be deleted this way since it has no header to right click on
		}


		public void AddEvent( int t )
		{
			List<ISelectableElement> newEvents = new List<ISelectableElement>();

			int undoGroup = Undo.GetCurrentGroup();

			foreach( FTrackEditor trackEditor in TrackSelection.Editors )
			{
				FEvent evt = trackEditor.TryAddEvent( t );
				if( evt )
				{
					FEventEditor evtEditor = GetEditor<FEventEditor>( evt );
					evtEditor.Init( evt, trackEditor );
					newEvents.Add( evtEditor );
				}
			}

			if( newEvents.Count > 0 )
			{
				int currentFrame = Sequence.CurrentFrame;

				DeselectAll();
				Select( newEvents );

				if( currentFrame >= 0 )
				{
					foreach( FTrackEditor trackEditor in TrackSelection.Editors )
					{
						trackEditor.Track.Init();
					}
				}
			}
			else
				EditorApplication.Beep();

			Undo.CollapseUndoOperations( undoGroup );
		}

		public void DestroyEvents( List<FEventEditor> events )
		{
			if( events.Count == 0 )
				return;

			List<FTrackEditor> trackEditors = new List<FTrackEditor>();
			List<Object> objs = new List<Object>();

			for( int i = 0; i != events.Count; ++i )
			{
				objs.Add( events[i] );
				objs.Add( events[i].Evt );

				if( !trackEditors.Contains( events[i].TrackEditor ) )
					trackEditors.Add( events[i].TrackEditor );
			}

			for( int i = 0; i != trackEditors.Count; ++i )
			{
				objs.Add( trackEditors[i] );
				objs.Add( trackEditors[i].Track );
			}
//			objs.Add( _editorCache );
			objs.Add( this ); // add itself, to save selection lists

			Undo.SetCurrentGroupName( "delete Events" );
			Undo.RecordObjects( objs.ToArray(), "delete Events");
			
			for( int j = events.Count-1; j > -1; --j )
			{
				FEventEditor evtEditor = events[j];
				evtEditor.OnDelete();

				_editorCache.Remove( evtEditor );
				EventSelection.Remove( evtEditor );

				evtEditor.TrackEditor._eventEditors.Remove( evtEditor );
				Undo.SetTransformParent( evtEditor.Evt.transform, null, string.Empty );
				evtEditor.Evt.Track.Remove( evtEditor.Evt );

				GameObject evtGO = evtEditor.Evt.gameObject;
				Undo.DestroyObjectImmediate( evtEditor );
				Undo.DestroyObjectImmediate( evtGO );
			}
		}

		private class MouseHoverData
		{
			public int Frame = -1;
			public FEditor Editor = null; 

			public void Copy( MouseHoverData data )
			{
				Frame = data.Frame;
				Editor = data.Editor;
			}

			public void Clear(){ Frame = -1; Editor = null; }
		}

		public void SetMouseHover( float mouseX, FEditor editor )
		{
			if( editor == null )
				_mouseHoverData.Clear();
			else
			{
				_mouseHoverData.Frame = GetFrameForX( mouseX );
				_mouseHoverData.Editor = editor;
			}
		}

		public override void ReserveGuiIds ()
		{
			_headerResizerGuiId = EditorGUIUtility.GetControlID( FocusType.Passive );
			base.ReserveGuiIds();
		}

		public void OnGUI()
		{
			if( Application.isPlaying )
			{
				GUI.color = new Color(0.5f, 0.5f, 0.5f, 0.5f);
				GUI.enabled = false;
			}

			if( !Sequence.HasTimelines() )
			{
				if( _renderingOnEditorWindow )
					_renderingOnEditorWindow.ShowNotification( new GUIContent("Drag GameObjects Here") );
			}

			if( Event.current.type == EventType.KeyDown && Event.current.keyCode == KeyCode.F && EditorGUIUtility.keyboardControl == 0 )
			{
				FocusOnSelection();
				Event.current.Use();
			}
				
			_pixelsPerFrame = (_sequenceRect.width - _headerWidth) / _viewRange.Length;

			ReserveGuiIds();

			_scrollPos.y = GUI.VerticalScrollbar( _verticalScrollerRect, _scrollPos.y, Mathf.Min( _sequenceRect.height, Height ), 0, Height );

			// content is offset based on the scrool position, since we just care about vertical forget the rest
			_contentOffset.y = -_scrollPos.y;

			Rect scrolledViewRect = _viewRect;

			GUI.BeginGroup( scrolledViewRect );

			Rect timelineRect = _sequenceRect;
			timelineRect.y = -_scrollPos.y;
			timelineRect.height = 0;

			Handles.color = FGUI.GetLineColor();

			Rect normalizedScrollViewRect = _sequenceRect;
			normalizedScrollViewRect.x = 0;
			normalizedScrollViewRect.yMin = -_scrollPos.y;

			SetMouseHover( -1, null );

			Render( normalizedScrollViewRect, _headerWidth );

			if( Event.current.type == EventType.MouseDown && Event.current.button != 1 && EditorGUIUtility.hotControl == 0 )
				StartDragSelect();
			if( _isDragSelecting )
			{
				OnDragSelect();
			}

			if( Event.current.type == EventType.MouseUp || Event.current.type == EventType.Ignore )
			{
				if( EditorDragged != null )
				{
					StopDraggingEditor();
				}
				if( _isDragSelecting )
				{
					StopDragSelect();
				}
			}

			if( EditorDragged != null )
			{
				float indent = 0;
				FEditor owner = EditorDragged.Owner;
				while( owner != null )
				{
					indent += owner.ContentOffset.x;
					owner = owner.Owner;
				}
				Rect editorDraggedRect = EditorDraggedRect;
				editorDraggedRect.x += indent;
				editorDraggedRect.y += Event.current.mousePosition.y;
//				EditorGUI.DrawRect( editorDraggedRect, FGUI.GetWindowColor() );
				EditorDragged.Render( editorDraggedRect, _headerWidth-indent );
				Repaint();
//				EditorGUI.DrawTextureAlpha( new Rect(0, 0, 100, 100), EditorGUIUtility.whiteTexture);

				if( !(EditorDragged is FContainerEditor) && !(EditorDragged is FEventEditor) )
				{
					System.Type typeOfOwner = null;
					if( EditorDragged is FTrackEditor )
						typeOfOwner = typeof(FTimelineEditor);
					else if( EditorDragged is FTimelineEditor )
						typeOfOwner = typeof(FContainerEditor);

					FEditor editorBelowMouse = null;
					foreach( FContainerEditor containerEditor in Editors )
					{
						if( typeOfOwner == typeof(FContainerEditor) )
						{
							if( containerEditor.GetGlobalRect().Contains( Event.current.mousePosition ) )
							{
								editorBelowMouse = containerEditor;
								break;
							}

						}
						else
						{
							foreach( FTimelineEditor timelineEditor in containerEditor.Editors )
							{
								if( typeOfOwner == typeof(FTimelineEditor) )
								{
									if( timelineEditor.GetGlobalRect().Contains( Event.current.mousePosition ) )
									{
										editorBelowMouse = timelineEditor;
										break;
									}
								}
								else
								{
									// handle events
								}
							}
						}
					}
					if( editorBelowMouse != null )
					{
						Rect r = editorBelowMouse.GetGlobalRect();
						float lineWidth = 3;
						float halfLineWidth = lineWidth * 0.33f;
						Color c = Handles.selectedColor;
						c.a = 1f;
						Handles.color = c;
						Vector3 pt0 = new Vector3( r.xMin+halfLineWidth, r.yMin+halfLineWidth );
						Vector3 pt1 = new Vector3( r.xMin+halfLineWidth, r.yMax-halfLineWidth );
						Vector3 pt2 = new Vector3( r.xMax-halfLineWidth, r.yMax-halfLineWidth );
						Vector3 pt3 = new Vector3( r.xMax-halfLineWidth, r.yMin+halfLineWidth );
						Handles.DrawSolidRectangleWithOutline( new Vector3[]{ pt0, pt1, pt2, pt3 }, new Color( 0, 0, 0, 0 ), c );
					}
				}
			}

			switch( Event.current.type )
			{
			    case EventType.DragUpdated:
				    if( normalizedScrollViewRect.Contains( Event.current.mousePosition ) )
				    {
					    DragAndDrop.visualMode = DragAndDropVisualMode.Link;
					    Event.current.Use();
				    }
				    break;
			    case EventType.DragPerform:
				    if( !normalizedScrollViewRect.Contains( Event.current.mousePosition ) )
					    break;
				
				    FContainerEditor containerEditor = null;
				    foreach( FContainerEditor editor in Editors )
				    {
					    if( editor.GetGlobalRect().Contains( Event.current.mousePosition ) )
					    {
						    containerEditor = editor;
						    break;
					    }
				    }
				
				    if( containerEditor == null )
				    {
					    if( Editors.Count > 0 )
						    containerEditor = Editors[Editors.Count-1];
					    else
					    {
						    CreateContainer( new FColorSetting("Default", FGUI.DefaultContainerColor()) );
						    containerEditor = GetEditor<FContainerEditor>( Sequence.Containers[0] );
					    }
				    }
				
				    foreach( UnityEngine.Object obj in DragAndDrop.objectReferences )
				    {
					    if( !(obj is GameObject) )
					    {
						    continue;
					    }
					
					    PrefabType prefabType = PrefabUtility.GetPrefabType(obj);
					    if( prefabType == PrefabType.ModelPrefab || prefabType == PrefabType.Prefab )
						    continue;
					
					    Undo.IncrementCurrentGroup();
					    UnityEngine.Object[] objsToSave = new UnityEngine.Object[]{ Sequence, this };
					
					    Undo.RecordObjects( objsToSave, string.Empty );
					
					    FTimeline timeline = FTimeline.Create( ((GameObject)obj).transform );
					
					    containerEditor.Container.Add( timeline );
					
					    Undo.RegisterCreatedObjectUndo( timeline.gameObject, "create Timeline" );
					    Undo.CollapseUndoOperations( Undo.GetCurrentGroup() );
				    }
				    if( _renderingOnEditorWindow != null )
					    _renderingOnEditorWindow.RemoveNotification();
				    Event.current.Use();
				    DragAndDrop.AcceptDrag();
				    Refresh();
				    EditorGUIUtility.ExitGUI();
				    break;
			}

			GUI.EndGroup();

			if( Sequence.Length != _sequenceLength )
			{
				if( Sequence.Length < _sequenceLength )
				{
					_viewRange.Start = 0;
					_viewRange.End = Sequence.Length;
				}
				else
				{
					_viewRange.End = _viewRange.Start + Mathf.RoundToInt( ((_viewRange.End - _viewRange.Start) / (float)_sequenceLength) * Sequence.Length );
				}

				_sequenceLength = Sequence.Length;
			}

			GUI.enabled = true;
			GUI.backgroundColor = Color.white;
			int newT = FGUI.TimeScrubber( _timeScrubberRect, Sequence.CurrentFrame, Sequence.FrameRate, _viewRange );

			if( newT != Sequence.CurrentFrame )
			{
				if( _renderingOnEditorWindow )
					_renderingOnEditorWindow.Focus();

				SetCurrentFrame( newT );

				if( _isPlaying || Sequence.IsPlaying )
					Pause();
			}

			_viewRange = FGUI.ViewRangeBar( _viewRangeRect, _viewRange, Sequence.Length );

			if( _timelineHeaderResizerRect.Contains(Event.current.mousePosition) )
				EditorGUIUtility.AddCursorRect( _timelineHeaderResizerRect, MouseCursor.ResizeHorizontal );

			switch( Event.current.type )
			{
			case EventType.MouseDown:

				bool leftClick = Event.current.button == 0 && !Event.current.alt;

				if( leftClick ) // left button
				{
					if( EditorGUIUtility.hotControl == 0 && _timelineHeaderResizerRect.Contains(Event.current.mousePosition) )
					{
						EditorGUIUtility.hotControl = _headerResizerGuiId;
						Event.current.Use();
					}
					else if( Rect.Contains( Event.current.mousePosition ) ) 
					{
						DeselectAll();
						Event.current.Use();
					}
				}
				break;
			case EventType.MouseDrag:
				if( EditorGUIUtility.hotControl == _headerResizerGuiId )
				{
					_headerWidth = (int)Mathf.Max( MINIMUM_HEADER_WIDTH, _headerWidth+Event.current.delta.x );

					RebuildLayout( Rect );
					EditorWindow.GetWindow<FSequenceEditorWindow>().Repaint();
					Event.current.Use();
				}

				break;
			case EventType.MouseUp:
				if( EditorGUIUtility.hotControl == _headerResizerGuiId )
				{
					EditorGUIUtility.hotControl = 0;
					Event.current.Use();
				}
				break;
			case EventType.Repaint:
				Rect dragArea = _timelineHeaderResizerRect;
				dragArea.xMax -= 10;
				dragArea.xMin = dragArea.xMax - 16;
				GUIStyle dragStyle = FUtility.GetFluxSkin().GetStyle( "HorizontalPanelSeparatorHandle" );
				dragStyle.Draw( dragArea, GUIContent.none, 0 );
//				GUI.DrawTexture( dragArea, EditorGUIUtility.whiteTexture );
				Handles.color = FGUI.GetLineColor();// new Color(0.8f, 0.8f, 0.8f, 0.2f);
//				Handles.DrawLine( new Vector3( _viewRect.xMin-16, _sequenceRect.yMax, 0), new Vector3(_viewRect.xMax-RIGHT_BORDER, _sequenceRect.yMax, 0) );
//				Handles.DrawLine( new Vector3( _sequenceRect.xMin, _sequenceRect.yMin, 0), new Vector3( _sequenceRect.xMax, _sequenceRect.yMin, 0) );
//				Handles.color = Color.black;
				break;
			case EventType.ScrollWheel:
				if( _viewRect.Contains(Event.current.mousePosition) )
				{
					_scrollPos.y += Event.current.delta.y * SCROLL_WHEEL_SPEED;
					Event.current.Use();
				}
				break;
			case EventType.ValidateCommand:
				if( EventSelection.Editors.Count == 1 )
					Event.current.Use();
				else if( EventSelection.Editors.Count == 0 )
				{
					if( TrackSelection.Editors.Count == 1 )
						Event.current.Use();
					else if( TrackSelection.Editors.Count == 0 )
					{
						if( TimelineSelection.Editors.Count == 1 )
							Event.current.Use();
						else if( TimelineSelection.Editors.Count == 0 )
						{
							if( ContainerSelection.Editors.Count == 1 )
								Event.current.Use();
						}
					}
				}
				break;
			case EventType.ExecuteCommand:
				if( Event.current.commandName == "Copy" )
				{
					if( EventSelection.Editors.Count == 1 )
						CopyEditor(EventSelection.Editors[0]);
					else if( EventSelection.Editors.Count == 0 )
					{
						if( TrackSelection.Editors.Count == 1 )
							CopyEditor(TrackSelection.Editors[0]);
						else if( TrackSelection.Editors.Count == 0 )
						{
							if( TimelineSelection.Editors.Count == 1 )
								CopyEditor(TimelineSelection.Editors[0]);
							else if( TimelineSelection.Editors.Count == 0 )
							{
								if( ContainerSelection.Editors.Count == 1 )
									CopyEditor(ContainerSelection.Editors[0]);
							}
						}
					}
				}
				break;
			}

#if FLUX_TRIAL
			GUIStyle watermarkLabel = new GUIStyle( GUI.skin.label );
			watermarkLabel.fontSize = 24;
			GUIContent watermark = new GUIContent("..::FLUX TRIAL::..");
			Vector2 watermarkSize = watermarkLabel.CalcSize( watermark );
			Rect watermarkRect = new Rect( Rect.width*0.5f-watermarkSize.x*0.5f, Rect.height*0.5f - watermarkSize.y*0.5f, watermarkSize.x, watermarkSize.y );

			GUI.color = new Color( 1f, 1f, 1f, 0.4f );
			GUI.Label( watermarkRect, watermark, watermarkLabel );
#endif
		}

		#region Drag Editor

		public void StartDraggingEditor( FEditor editorDragged )
		{
			if( _isDragSelecting )
				return; // if we're drag selecting, move on
			EditorDragged = editorDragged;
			EditorGUIUtility.hotControl = EditorDragged.GuiId;
			Event.current.Use();
		}

		public void StopDraggingEditor()
		{
			if( EditorDragged == null ) return;

			FEditor editorBelowMouse = null;

			if( EditorDragged is FContainerEditor )
			{
				editorBelowMouse = this;
			}
			else
			{
				foreach( FContainerEditor containerEditor in Editors )
				{
					if( EditorDragged is FTimelineEditor )
					{
						if( containerEditor.GetGlobalRect().Contains( Event.current.mousePosition ) )
						{
							editorBelowMouse = containerEditor;
							break;
						}
					}
					else
					{
						foreach( FTimelineEditor timelineEditor in containerEditor.Editors )
						{
							if( EditorDragged is FTrackEditor )
							{
								if( timelineEditor.GetGlobalRect().Contains( Event.current.mousePosition ) )
								{
									editorBelowMouse = timelineEditor;
									break;
								}
							}
							else // handle events?
							{

							}
						}
					}
				}
			}

			if( editorBelowMouse != null )
			{
				if( editorBelowMouse == EditorDragged.Owner )
				{
					if( EditorDragged.Owner is FSequenceEditor )
						((FSequenceEditor)EditorDragged.Owner).UpdateListFromOffsets();
					if( EditorDragged.Owner is FContainerEditor )
						((FContainerEditor)EditorDragged.Owner).UpdateListFromOffsets();
					if( EditorDragged.Owner is FTimelineEditor )
						((FTimelineEditor)EditorDragged.Owner).UpdateListFromOffsets();
				}
				else
				{
					Undo.SetTransformParent( EditorDragged.Obj.transform, editorBelowMouse.Obj.transform, "move Editor" );
				}
			}

			CancelDragEditor();
		}

		public void CancelDragEditor()
		{
			if( EditorDragged == null ) return;

			EditorDragged.Owner.ClearOffset();
			EditorDragged = null;
			EditorGUIUtility.hotControl = 0;
			Event.current.Use();
			Repaint();
		}

		#endregion

		private MouseHoverData _mouseDownData = new MouseHoverData();
		private MouseHoverData _mouseHoverData = new MouseHoverData();
		private bool _isDragSelecting = false;

		public void StartDragSelect()
		{
			if( _isDragSelecting )
				return;

			_mouseDownData.Copy( _mouseHoverData );
			if( _mouseDownData.Editor != null && EditorGUIUtility.hotControl == 0 )
			{
				_isDragSelecting = true;
				Event.current.Use();
			}
		}

		public void StopDragSelect()
		{
			if( !_isDragSelecting )
				return;
			if( !Event.current.shift && !Event.current.alt )
				DeselectAll();

			bool select = !Event.current.alt;

			Rect selectionRect = GetSelectionRect();

			FrameRange selectRange = new FrameRange( GetFrameForX( selectionRect.xMin - _headerWidth ),
			                                        GetFrameForX( selectionRect.xMax - _headerWidth ) );

			for( int i = 0; i != Editors.Count; ++i )
			{
				Rect containerRect = Editors[i].GetGlobalRect();
				if( selectionRect.yMin > containerRect.yMax )
					continue;

				if( selectionRect.yMax < containerRect.yMin )
					break;

				for( int j = 0; j != Editors[i].Editors.Count; ++j )
				{
					List<FTrackEditor> tracks = Editors[i].Editors[j].Editors;
					for( int k = 0; k != tracks.Count; ++k )
					{
						Rect trackRect = tracks[k].GetGlobalRect();
						if( selectionRect.yMin >= trackRect.yMax )
							continue;

						if( selectionRect.yMax <= trackRect.yMin )
							break;

						if( select )
							tracks[k].SelectEvents( selectRange );
						else 
							tracks[k].DeselectEvents( selectRange );
					}
				}
			}

			_isDragSelecting = false;
			_mouseDownData.Clear();

			Event.current.Use();
		}

		public void OnDragSelect()
		{
			if( !_isDragSelecting )
				return;

			if( Event.current.shift )
				EditorGUIUtility.AddCursorRect( Rect, MouseCursor.ArrowPlus );

			if( Event.current.alt )
				EditorGUIUtility.AddCursorRect( Rect, MouseCursor.ArrowMinus );

			Rect selectionRect = GetSelectionRect();
			GUI.color = FGUI.GetSelectionColor();
			GUI.DrawTexture( selectionRect, EditorGUIUtility.whiteTexture );
			Repaint();
		}

		private Rect GetSelectionRect()
		{
			MouseHoverData hoverData = _mouseHoverData;
			int hoverFrame = hoverData.Frame;
			if( hoverData.Editor == null )
			{
				hoverData = _mouseDownData;
				hoverFrame = Event.current.mousePosition.x < _headerWidth ? _viewRange.Start : _viewRange.End;
			}

			float x1 = GetXForFrame( _mouseDownData.Frame ) + _headerWidth;
			float x2 = GetXForFrame( hoverFrame ) + _headerWidth;

			Rect downRect = _mouseDownData.Editor.GetGlobalRect();
			Rect hoverRect = hoverData.Editor.GetGlobalRect();

			Rect r = new Rect();
			r.xMin = Mathf.Min( x1, x2 );
			r.xMax = Mathf.Max( x1, x2 );
			r.yMin = Mathf.Min( downRect.yMin, hoverRect.yMin );
			r.yMax = Mathf.Max( downRect.yMax, hoverRect.yMax );

			if( r.width == 0 )
			{
				r.xMin -= 0.5f;
				r.xMax += 0.5f;
			}

			return r;
		}

		public void FocusOnSelection()
		{
			int start = 0;
			int end = Sequence.Length;

			if( _eventSelection.Editors.Count > 0 )
			{
				start = end;
				end = 0;
				for( int i = 0; i != _eventSelection.Editors.Count; ++i )
				{
					FEvent evt = (FEvent)_eventSelection.Editors[i].Obj;
					if( evt.Start < start )
						start = evt.Start;
					if( evt.End > end )
						end = evt.End;
				}
		   }

			_viewRange = new FrameRange( start, end );
		}

		public void MoveEvents( int deltaFrames )
		{
			bool movingLeft = deltaFrames < 0;

			int howMuchCanMove = int.MaxValue;

			for( int i = 0; i != _trackSelection.Editors.Count; ++i )
			{
				if( movingLeft )
				{
					for( int j = 0; j != _trackSelection.Editors[i]._eventEditors.Count; ++j )
					{
						FEventEditor evtEditor = _trackSelection.Editors[i]._eventEditors[j];
						if( evtEditor.IsSelected )
						{
							if( j == 0 )
								howMuchCanMove = Mathf.Min( howMuchCanMove, evtEditor.Evt.Start );
							else if( !_trackSelection.Editors[i]._eventEditors[j-1].IsSelected )
								howMuchCanMove =  Mathf.Min( howMuchCanMove , evtEditor.Evt.Start - _trackSelection.Editors[i]._eventEditors[j-1].Evt.End );
						}
					}
				}
				else
				{
					int lastElementIndex = _trackSelection.Editors[i]._eventEditors.Count-1;
					for( int j = lastElementIndex; j != -1; --j )
					{
						FEventEditor evtEditor = _trackSelection.Editors[i]._eventEditors[j];
						if( evtEditor.IsSelected )
						{
							if( j == lastElementIndex )
								howMuchCanMove = Mathf.Min( howMuchCanMove, Sequence.Length - evtEditor.Evt.End );
							else if( !_trackSelection.Editors[i]._eventEditors[j+1].IsSelected )
								howMuchCanMove = Mathf.Min( howMuchCanMove, _trackSelection.Editors[i]._eventEditors[j+1].Evt.Start - evtEditor.Evt.End );
						}
					}
				}
			}

			if( movingLeft )
			{
				howMuchCanMove = -howMuchCanMove;
				deltaFrames = Mathf.Clamp( deltaFrames, howMuchCanMove, 0 );
			}
			else
			{
				deltaFrames = Mathf.Clamp( deltaFrames, 0, howMuchCanMove );
			}

			if( deltaFrames != 0 )
			{
				int start = 0; 
				int limit = EventSelection.Editors.Count;
				int increment = 1;

				if( !movingLeft )
				{
					start = limit -1;
					limit = -1;
					increment = -increment;
				}
				int undoGroup = Undo.GetCurrentGroup();
				Undo.SetCurrentGroupName( "move Events" );
				for( int i = start; i != limit; i += increment )
				{
					FrameRange newFrameRange = EventSelection.Editors[i].Evt.FrameRange;
					newFrameRange.Start += deltaFrames;
					newFrameRange.End += deltaFrames;
					MoveEvent( EventSelection.Editors[i].Evt, newFrameRange );
				}
				Undo.CollapseUndoOperations( undoGroup );
			}

			Repaint();
		}

		public void ResizeEventsLeft( int delta )
		{
			int howMuchCanResize = int.MaxValue;

			// making them bigger?
			if( delta < 0 )
			{
				for( int i = 0; i != _eventSelection.Editors.Count; ++i )
				{
					int evtId = _eventSelection.Editors[i].Obj.GetId ();
					int howMuchCanEvtResize = _eventSelection.Editors[i].Evt.Start;
					if( evtId > 0 )
						howMuchCanEvtResize -= _eventSelection.Editors[i].Evt.Track.GetEvent( evtId - 1 ).End;

					if( howMuchCanResize > howMuchCanEvtResize )
						howMuchCanResize = howMuchCanEvtResize;
				}

				delta = Mathf.Clamp( delta, -howMuchCanResize, 0 );
			}
			else // making them smaller
			{
				for( int i = 0; i != _eventSelection.Editors.Count; ++i )
				{
					int howMuchCanEvtResize = _eventSelection.Editors[i].Evt.Length-_eventSelection.Editors[i].Evt.GetMinLength();
					if( howMuchCanResize > howMuchCanEvtResize )
						howMuchCanResize = howMuchCanEvtResize;
				}

				delta = Mathf.Clamp( delta, 0, howMuchCanResize );
			}

			for( int i = 0; i != _eventSelection.Editors.Count; ++i )
			{
				FrameRange evtRange = _eventSelection.Editors[i].Evt.FrameRange;
				evtRange.Start += delta;
				MoveEvent( _eventSelection.Editors[i].Evt, evtRange );
			}
		}

		public void ResizeEventsRight( int delta )
		{
			int howMuchCanResize = int.MaxValue;
			
			// making them bigger?
			if( delta > 0 )
			{
				for( int i = 0; i != _eventSelection.Editors.Count; ++i )
				{
					int evtId = _eventSelection.Editors[i].Obj.GetId ();
					int howMuchCanEvtResize = _eventSelection.Editors[i].Evt.IsLastEvent ? Sequence.Length : _eventSelection.Editors[i].Evt.Track.GetEvent( evtId + 1 ).Start;

					howMuchCanEvtResize -= _eventSelection.Editors[i].Evt.End;

					if( howMuchCanResize > howMuchCanEvtResize )
						howMuchCanResize = howMuchCanEvtResize;
				}
				
				delta = Mathf.Clamp( delta, 0, howMuchCanResize );
			}
			else // making them smaller
			{
				for( int i = 0; i != _eventSelection.Editors.Count; ++i )
				{
					int howMuchCanEvtResize = _eventSelection.Editors[i].Evt.Length-_eventSelection.Editors[i].Evt.GetMinLength();
					if( howMuchCanResize > howMuchCanEvtResize )
						howMuchCanResize = howMuchCanEvtResize;
				}
				
				delta = Mathf.Clamp( delta, -howMuchCanResize, 0 );
			}
			
			for( int i = 0; i != _eventSelection.Editors.Count; ++i )
			{
				FrameRange evtRange = _eventSelection.Editors[i].Evt.FrameRange;
				evtRange.End += delta;
				MoveEvent( _eventSelection.Editors[i].Evt, evtRange );
			}
		}


		public void MoveEvent( FEvent evt, FrameRange newFrameRange )
		{
			FrameRange oldFrameRange = evt.FrameRange;

			if( oldFrameRange == newFrameRange || newFrameRange.Start > newFrameRange.End )
				return;
			
			if( newFrameRange.Length < evt.GetMinLength() || newFrameRange.Length > evt.GetMaxLength() )
			{
				Debug.LogError( string.Format("Trying to resize an Event to [{0},{1}] (length: {2}) which isn't a valid length, should be between [{3},{4}]", newFrameRange.Start, newFrameRange.End, newFrameRange.Length, evt.GetMinLength(), evt.GetMaxLength() ), evt );
				return;
			}
			
			bool changedLength = oldFrameRange.Length != newFrameRange.Length;
			
			if( !evt.Track.CanAdd( evt, newFrameRange ) )
				return;
			
			Undo.RecordObject( evt, changedLength ? "resize Event" : "move Event" );
			
			evt.FrameRange = newFrameRange;

			GetEditor<FEventEditor>( evt ).OnEventMoved( oldFrameRange );

			EditorUtility.SetDirty( evt );
			
			if( FSequenceEditorWindow.instance != null )
				FSequenceEditorWindow.instance.Repaint();
		}


		public void SelectExclusive( ISelectableElement e )
		{
			int undoGroup = Undo.GetCurrentGroup();
			DeselectAll();

			Select( e );
			Undo.CollapseUndoOperations( undoGroup );

			Repaint();
		}
		
		public void Select( List<ISelectableElement> elements )
		{
			Undo.IncrementCurrentGroup();
			
			foreach( ISelectableElement e in elements )
			{
				if( !e.IsSelected )
					Select( e );
			}
			
			Undo.CollapseUndoOperations( Undo.GetCurrentGroup() );
			
			Repaint();
		}
		
		public void Deselect( IEnumerable<ISelectableElement> elements )
		{

			foreach( ISelectableElement e in elements )
			{
				if( e.IsSelected )
					Deselect( e );
			}
			
			Repaint();
		}
		

		public void Select( ISelectableElement e )
		{
			if( e.IsSelected )
				return;

			int undoGroup = Undo.GetCurrentGroup();
			string undoStr = "select ";

			if( e is FEventEditor )
			{
				Select( ((FEventEditor)e).TrackEditor );
				undoStr += "Event";
			}
			else if( e is FTrackEditor )
			{
				undoStr += "Track";
			}
			else if( e is FTimelineEditor )
			{
				Deselect( EventSelection.Editors.ToArray() );
				Deselect( TrackSelection.Editors.ToArray() );
				Deselect( ContainerSelection.Editors.ToArray() );
				undoStr += "Timeline";
			}
			else if( e is FContainerEditor )
			{
				Deselect( EventSelection.Editors.ToArray() );
				Deselect( TrackSelection.Editors.ToArray() );
				Deselect( TimelineSelection.Editors.ToArray() );
				undoStr += "Container";
			}

			Undo.RecordObjects( new Object[]{ (UnityEngine.Object)e, this }, undoStr );

			if( e is FEventEditor )
				EventSelection.Add( (FEventEditor)e );
			else if( e is FTrackEditor )
				TrackSelection.Add( (FTrackEditor)e );
			else if( e is FTimelineEditor )
				TimelineSelection.Add( (FTimelineEditor)e );
			else if( e is FContainerEditor )
				ContainerSelection.Add( (FContainerEditor)e );

			e.OnSelect();

			Repaint();
			Undo.CollapseUndoOperations( undoGroup );
		}

		public void Deselect( ISelectableElement e )
		{
			if( !e.IsSelected )
				return;

			string undoStr = "deselect ";

			if( e is FEventEditor )
				undoStr += "Event";
			else if( e is FTrackEditor )
				undoStr += "Track";
			else if( e is FTimelineEditor )
				undoStr += "Timeline";
			else if( e is FContainerEditor )
				undoStr += "Container";

			Undo.RecordObjects( new Object[]{ (UnityEngine.Object)e, this }, undoStr );

			if( e is FEventEditor )
				EventSelection.Remove( (FEventEditor)e );
			else if( e is FTrackEditor )
				TrackSelection.Remove( (FTrackEditor)e );
			else if( e is FTimelineEditor )
				TimelineSelection.Remove( (FTimelineEditor)e );
			else if( e is FContainerEditor )
				ContainerSelection.Remove( (FContainerEditor)e );
			
			e.OnDeselect();

			Repaint();
		}
		
		public void DeselectAll()
		{
			int numEvents = EventSelection.Editors.Count;
			int numTracks = TrackSelection.Editors.Count;
			int numTimelines = TimelineSelection.Editors.Count;
			int numContainers = ContainerSelection.Editors.Count;
			
			int totalSelected = numEvents + numTracks + numTimelines + numContainers;
			
			if( totalSelected == 0 )
				return;
			
			// tracks + events + window
			Object[] objsToSave = new Object[totalSelected+1];
			
			int i = 0;
			
			for( int j = 0; j != numEvents; ++i, ++j )
				objsToSave[i] = EventSelection.Editors[j];
			
			for( int j = 0; j != numTracks; ++i, ++j )
				objsToSave[i] = TrackSelection.Editors[j];

			for( int j = 0; j != numTimelines; ++i, ++j )
				objsToSave[i] = TimelineSelection.Editors[j];

			for( int j = 0; j != numContainers; ++i, ++j )
				objsToSave[i] = ContainerSelection.Editors[j];
			
			objsToSave[totalSelected] = this;
			
			Undo.RegisterCompleteObjectUndo( objsToSave, "deselect all" );
			
			for( int j = 0; j != numEvents; ++j )
				EventSelection.Editors[j].OnDeselect();
			
			for( int j = 0; j != numTracks; ++j )
				TrackSelection.Editors[j].OnDeselect();

			for( int j = 0; j != numTimelines; ++j )
				TimelineSelection.Editors[j].OnDeselect();

			for( int j = 0; j != numContainers; ++j )
				ContainerSelection.Editors[j].OnDeselect();
			
			EventSelection.Clear();
			TrackSelection.Clear();
			TimelineSelection.Clear();
			ContainerSelection.Clear();

			Repaint();

			if( FInspectorWindow._instance )
			{
				FInspectorWindow._instance.Repaint();
			}
		}

		public void EnableAllTracks( bool enable )
		{
			foreach( FContainerEditor containerEditor in Editors )
			{
				foreach( FTimelineEditor timelineEditor in containerEditor.Editors )
				{
					foreach( FTrackEditor trackEditor in timelineEditor.Editors )
					{
						if( trackEditor.Track.enabled != enable )
						{
							trackEditor.OnToggle( enable );
						}
					}
				}
			}
		}

		private Dictionary<int, FTrackEditor> _dirtyTracks = new Dictionary<int, FTrackEditor>();

		public void SetDirty( FTrackEditor trackEditor )
		{
			if( !_dirtyTracks.ContainsKey( trackEditor.GetInstanceID() ) )
				_dirtyTracks.Add( trackEditor.GetInstanceID(), trackEditor );
			_timeNotifyDirtyTracks = EditorApplication.timeSinceStartup + NOTIFY_DIRTY_TRACKS_DELTA;
		}

		public void SetAllDirty()
		{
			foreach( FContainerEditor containerEditor in Editors )
			{
				foreach( FTimelineEditor timelineEditor in containerEditor.Editors )
				{
					foreach( FTrackEditor trackEditor in timelineEditor.Editors )
					{
						SetDirty( trackEditor );
					}
				}
			}
		}

		public void NotifyDirtyTracks()
		{
			int currentFrame = Sequence.CurrentFrame;

			Dictionary<int, FTrackEditor>.Enumerator e = _dirtyTracks.GetEnumerator();

			while( e.MoveNext() )
			{
				e.Current.Value.OnTrackChanged();
			}

			_dirtyTracks.Clear();

			if( currentFrame >= 0 && Sequence.CurrentFrame != currentFrame )
				SetCurrentFrame( currentFrame );
		}

		#region Playback functions

		private bool _isPlaying = false;
		public bool IsPlaying { get { return _isPlaying; } }

		private bool _isPlayingForward = true;
		public bool IsPlayingForward { 
			get { return _isPlayingForward; } 
			set { 
				_isPlayingForward = value;
				if( Sequence )
				{
					Sequence.Speed = (_isPlayingForward ? 1 : -1) * Mathf.Abs(Sequence.Speed);
				}
			}
		}

		private double _timeLastUpdate = -1;

		private float _currentTime = 0;

		public void Play()
		{
			Play( true );
		}

		public void Play( bool restart )
		{
			if( !Sequence.IsStopped && restart )
				Sequence.Stop();

			int frame = _viewRange.Cull( Sequence.CurrentFrame );
			if( !Sequence.IsPlayingForward && frame == 0 )
			{
				Sequence.Stop();
				frame = _viewRange.End;
			}

			_timeLastUpdate = EditorApplication.timeSinceStartup;

			_currentTime = frame * Sequence.InverseFrameRate;

			if( Sequence.Speed == 0 )
				Sequence.Speed = Sequence.DefaultSpeed;

			if( Application.isPlaying )
			{
				Sequence.Play( _currentTime );
			}
			else
			{
				SetCurrentFrame( frame );

				_isPlaying = true;
			}

			FUtility.RepaintGameView();
		}

		public void Stop()
		{
			if( !object.Equals(Sequence, null) )
			{ 
				if( !Sequence.IsStopped )
				{
					Sequence.Stop( true );

					for( int i = 0; i != Editors.Count; ++i )
						Editors[i].OnStop();
				}

			}
			_isPlaying = false;

			FUtility.RepaintGameView();
		}

		public void Pause()
		{
//			Debug.Log ("Pause");
			Sequence.Pause();

			_isPlaying = false;

			FUtility.RepaintGameView();
		}

		public void SetCurrentFrame( int frame )
		{
			SetCurrentTime( frame * Sequence.InverseFrameRate );
		}

		public void SetCurrentTime( float time )
		{
			if( _dirtyTracks.Count > 0 )
				NotifyDirtyTracks();

			_currentTime = time;

			if( !Sequence.IsInit )
				Sequence.Init();

			int frame = (int)(time * Sequence.FrameRate);

			Sequence.SetCurrentTimeEditor( frame * Sequence.InverseFrameRate );

			for( int i = 0; i != Editors.Count; ++i )
				Editors[i].UpdateTimelines( frame, time );

			FUtility.RepaintGameView();
		}

		public void Update()
		{
			if( EditorApplication.isCompiling )
			{
				_isEditorCompiling = true;
				Stop();
			}
			else if( _isEditorCompiling )
			{
				_isEditorCompiling = false;
				if( Sequence != null )
				{
					foreach( FContainer container in Sequence.Containers )
					{
						foreach( FTimeline timeline in container.Timelines )
						{
							foreach( FTrack track in timeline.Tracks )
							{
								if( track.HasCache )
								{
									track.ClearCache();
								}
							}
						}
					}
				}
				Refresh();
			}

			// going into playmode
			if( EditorApplication.isPlayingOrWillChangePlaymode && !EditorApplication.isPlaying )
			{
				OnPlaymodeWillChange();
			}

			// coming out of playmode
			if( !EditorApplication.isPlayingOrWillChangePlaymode && EditorApplication.isPlaying )
			{
				_wasUnityInPlaymode = true;
				OnPlaymodeWillChange();
			}

			_onUpdateEvent.Invoke();

			if( _dirtyTracks.Count > 0 && _timeNotifyDirtyTracks < EditorApplication.timeSinceStartup /* && !_sequence.IsStopped */)
				NotifyDirtyTracks();

//			if( EditorApplication.isPlayingOrWillChangePlaymode )
//			{
//				Debug.Log("Application.isPlaying: " + Application.isPlaying + 
//				          "\nEditorApplication.isPlaying: " + EditorApplication.isPlaying + 
//				          "\nisPlayingOrWillChangePlaymode: " + EditorApplication.isPlayingOrWillChangePlaymode + 
//				          "\nisPaused: " + EditorApplication.isPaused +
//				          "\nisUpdating: " + EditorApplication.isUpdating );
//			}

			if( !_isPlaying )
				return;

			float delta = (float)((EditorApplication.timeSinceStartup - _timeLastUpdate)*Sequence.Speed);

			_timeLastUpdate = EditorApplication.timeSinceStartup;

			if( Sequence.UpdateMode != AnimatorUpdateMode.UnscaledTime )
			{
				delta *= Time.timeScale;
			}

			float newTime = _currentTime + delta;

			if( newTime > _viewRange.End * Sequence.InverseFrameRate )
			{
				Sequence.OnFinishedCallback.Invoke( Sequence );

				Play();
			}
			else if( newTime < 0 && !Sequence.IsPlayingForward )
			{
				Sequence.OnFinishedCallback.Invoke( Sequence );

				Play();
			}
			else
				SetCurrentTime( newTime );
			Repaint();


		}

		#endregion

		#region FEditor Copy / Paste

		public static FObject CopyObject { get { return _copyObject; } }

		private static FObject _copyObject = null;

		public void CopyEditor(FEditor editor)
		{
			Undo.RecordObject( this, string.Empty );
			if( _copyObject != null )
			{
				Undo.DestroyObjectImmediate( _copyObject.gameObject );
			}
			_copyObject = Instantiate<FObject>( editor.Obj );
			string objName = _copyObject.name;
			objName = objName.Substring(0, objName.Length - "(Clone)".Length);
			_copyObject.gameObject.name = objName;
			_copyObject.gameObject.hideFlags = HideFlags.HideAndDontSave;
			Undo.RegisterCreatedObjectUndo(CopyObject.gameObject, "Copy " + editor.Obj.name);
		}

		public void CutEditor(FEditor editor)
		{
			if( editor.IsSelected )
				Deselect( editor );
			CopyEditor( editor );
			DestroyEditor( editor );
		}

        #endregion FEditor Copy / Paste


        public void SaveToXml()
        {
            Sequence.SaveToXml();
            AssetDatabase.Refresh();
        }

        public void ReadFromXml()
        {

        }
    }
}