private IEnumerator <object> Drag(Boundaries boundaries, DragSide side)
{
IntVector2?last = null;
Save(boundaries);
bool isStretchingMarkers = input.IsKeyPressed(Key.Control);
using (Document.Current.History.BeginTransaction()) {
while (input.IsMousePressed())
{
Utils.ChangeCursorIfDefault(MouseCursor.SizeWE);
var current = grid.CellUnderMouse();
if (current == last)
{
yield return(null);
continue;
}
Document.Current.History.RollbackTransaction();
current.X = Math.Max(current.X, 0);
if (side == DragSide.Left)
{
current.X = Math.Min(current.X, boundaries.Right - 1);
}
else
{
current.X = Math.Max(current.X, boundaries.Left + 1);
}
Stretch(boundaries, side, current.X, stretchMarkers: isStretchingMarkers);
if (side == DragSide.Left)
{
boundaries.Left = current.X;
}
else
{
boundaries.Right = current.X;
}
ClearGridSelection.Perform();
for (int i = boundaries.Top; i <= boundaries.Bottom; ++i)
{
SelectGridSpan.Perform(i, boundaries.Left, boundaries.Right);
}
SetCurrentColumn.Perform(boundaries.Right);
last = current;
yield return(null);
}
Document.Current.History.CommitTransaction();
}
yield return(null);
}
private void Save(Boundaries boundaries)
{
savedPositions.Clear();
savedKeyframes.Clear();
savedMarkerPositions.Clear();
savedMarkers.Clear();
var length = boundaries.Right - boundaries.Left - 1;
for (int i = boundaries.Top; i <= boundaries.Bottom; ++i)
{
if (!(Document.Current.Rows[i].Components.Get <NodeRow>()?.Node is IAnimationHost animable))
{
continue;
}
foreach (var animator in animable.Animators)
{
savedKeyframes.Add(animator, new List <IKeyframe>());
var keys = animator.Keys.Where(k =>
boundaries.Left <= k.Frame &&
k.Frame < boundaries.Right
);
foreach (var key in keys)
{
savedPositions.Add(key, ((double)key.Frame - boundaries.Left) / length);
savedKeyframes[animator].Add(key);
}
}
}
var markers = Document.Current.Container.Markers.Where(k =>
boundaries.Left <= k.Frame &&
k.Frame < boundaries.Right);
foreach (var marker in markers)
{
savedMarkerPositions.Add(marker, ((double)marker.Frame - boundaries.Left) / length);
savedMarkers.Add(marker);
}
}
private void Stretch(Boundaries boundaries, DragSide side, int newPos, bool stretchMarkers)
{
int length;
if (side == DragSide.Left)
{
length = boundaries.Right - newPos - 1;
}
else
{
length = newPos - boundaries.Left - 1;
}
int oldLength = boundaries.Right - boundaries.Left - 1;
for (int i = boundaries.Top; i <= boundaries.Bottom; ++i)
{
if (!(Document.Current.Rows[i].Components.Get <NodeRow>()?.Node is IAnimationHost animable))
{
continue;
}
foreach (var animator in animable.Animators.ToList())
{
IEnumerable <IKeyframe> saved = savedKeyframes[animator];
if (
side == DragSide.Left && length < oldLength ||
side == DragSide.Right && length > oldLength
)
{
saved = saved.Reverse();
}
foreach (var key in saved)
{
RemoveKeyframe.Perform(animator, key.Frame);
}
foreach (var key in saved)
{
double relpos = savedPositions[key];
int newFrame;
if (side == DragSide.Left)
{
newFrame = (int)Math.Round(newPos + relpos * length);
}
else
{
newFrame = (int)Math.Round(boundaries.Left + relpos * length);
}
var newKey = key.Clone();
newKey.Frame = newFrame;
SetAnimableProperty.Perform(
animable, animator.TargetPropertyPath, newKey.Value,
createAnimatorIfNeeded: true,
createInitialKeyframeForNewAnimator: false,
newKey.Frame
);
SetKeyframe.Perform(animable, animator.TargetPropertyPath, Document.Current.AnimationId, newKey);
}
}
}
if (stretchMarkers)
{
foreach (var marker in savedMarkers)
{
DeleteMarker.Perform(Document.Current.Container, marker, removeDependencies: false);
}
foreach (var marker in savedMarkers)
{
double relpos = savedMarkerPositions[marker];
int newFrame;
if (side == DragSide.Left)
{
newFrame = (int)Math.Round(newPos + relpos * length);
}
else
{
newFrame = (int)Math.Round(boundaries.Left + relpos * length);
}
var newMarker = marker.Clone();
newMarker.Frame = newFrame;
SetMarker.Perform(Document.Current.Container, newMarker, removeDependencies: false);
}
}
}