public SnapEngine(IAttractable attractable, IAttractionHandler attractionHandler, ManipulateEdges manipulateEdges, WindowState state,
Vector2 mousePosition, IEnumerable <ISnappable> snappables = null)
{
m_Attractable = attractable;
m_ManipulateEdges = manipulateEdges;
m_AttractionHandler = attractionHandler;
m_State = state;
m_CurrentTimes = m_GrabbedTimes = new TimeBoundaries(m_Attractable.start, m_Attractable.end);
m_GrabbedTime = m_State.PixelToTime(mousePosition.x);
// Add Time zero as Magnet
AddMagnet(0.0, true, state);
// Add current Time as Magnet
// case1157280 only add current time as magnet if visible
if (TimelineWindow.instance.currentMode.ShouldShowTimeCursor(m_State))
{
AddMagnet(state.editSequence.time, true, state);
}
if (state.IsEditingASubTimeline())
{
// Add start and end of evaluable range as Magnets
// This includes the case where the master timeline has a fixed length
var range = state.editSequence.GetEvaluableRange();
AddMagnet(range.start, true, state);
AddMagnet(range.end, true, state);
}
else if (state.masterSequence.asset.durationMode == TimelineAsset.DurationMode.FixedLength)
{
// Add end sequence Time as Magnet
AddMagnet(state.masterSequence.asset.duration, true, state);
}
if (snappables == null)
{
snappables = GetVisibleSnappables(m_State);
}
foreach (var snappable in snappables)
{
if (!attractable.ShouldSnapTo(snappable))
{
continue;
}
var edges = snappable.SnappableEdgesFor(attractable, manipulateEdges);
foreach (var edge in edges)
{
AddMagnet(edge.time, edge.showSnapHint, state);
}
}
}
public void Snap(Vector2 currentMousePosition, EventModifiers modifiers)
{
var d = m_State.PixelToTime(currentMousePosition.x) - m_GrabbedTime;
m_CurrentTimes = m_GrabbedTimes.Translate(d);
bool isLeft = m_ManipulateEdges == ManipulateEdges.Left || m_ManipulateEdges == ManipulateEdges.Both;
bool isRight = m_ManipulateEdges == ManipulateEdges.Right || m_ManipulateEdges == ManipulateEdges.Both;
bool attracted = false;
m_SnapEnabled = modifiers == ManipulatorsUtils.actionModifier ? !m_State.edgeSnaps : m_State.edgeSnaps;
if (m_SnapEnabled)
{
SnapInfo leftActiveMagnet = null;
SnapInfo rightActiveMagnet = null;
if (isLeft)
{
leftActiveMagnet = ClosestMagnet(m_CurrentTimes.left);
}
if (isRight)
{
rightActiveMagnet = ClosestMagnet(m_CurrentTimes.right);
}
if (leftActiveMagnet != null || rightActiveMagnet != null)
{
attracted = true;
bool leftAttraction = false;
if (rightActiveMagnet == null)
{
// Attracted by a left magnet only.
leftAttraction = true;
}
else
{
if (leftActiveMagnet != null)
{
// Attracted by both magnets, choose the closest one.
var leftDistance = Math.Abs(leftActiveMagnet.time - m_CurrentTimes.left);
var rightDistance = Math.Abs(rightActiveMagnet.time - m_CurrentTimes.right);
leftAttraction = leftDistance <= rightDistance;
}
// else, Attracted by right magnet only
}
if (leftAttraction)
{
m_AttractionHandler.OnAttractedEdge(m_Attractable, m_ManipulateEdges, AttractedEdge.Left, leftActiveMagnet.time);
}
else
{
m_AttractionHandler.OnAttractedEdge(m_Attractable, m_ManipulateEdges, AttractedEdge.Right, rightActiveMagnet.time);
}
}
}
if (!attracted)
{
var time = isLeft ? m_CurrentTimes.left : m_CurrentTimes.right;
time = m_State.SnapToFrameIfRequired(time);
m_AttractionHandler.OnAttractedEdge(m_Attractable, m_ManipulateEdges, AttractedEdge.None, time);
}
}