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289 lines
10 KiB
C#
289 lines
10 KiB
C#
1 year ago
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using UnityEngine;
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using UnityEngine.Timeline;
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namespace UnityEditor.Timeline
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{
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enum ManipulateEdges
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{
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Left,
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Right,
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Both
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}
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class SnapEngine
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{
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static readonly float k_MagnetInfluenceInPixels = 10.0f;
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class SnapInfo
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{
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public double time { get; set; }
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public bool showSnapHint { get; set; }
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public bool IsInInfluenceZone(double currentTime, WindowState state)
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{
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var pos = state.TimeToPixel(currentTime);
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var magnetPos = state.TimeToPixel(time);
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return Math.Abs(pos - magnetPos) < k_MagnetInfluenceInPixels;
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}
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}
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struct TimeBoundaries
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{
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public TimeBoundaries(double l, double r)
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{
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left = l;
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right = r;
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}
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public readonly double left;
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public readonly double right;
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public TimeBoundaries Translate(double d)
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{
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return new TimeBoundaries(left + d, right + d);
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}
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}
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public static bool displayDebugLayout;
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readonly IAttractable m_Attractable;
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readonly IAttractionHandler m_AttractionHandler;
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readonly ManipulateEdges m_ManipulateEdges;
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readonly WindowState m_State;
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double m_GrabbedTime;
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TimeBoundaries m_GrabbedTimes;
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TimeBoundaries m_CurrentTimes;
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readonly List<SnapInfo> m_Magnets = new List<SnapInfo>();
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bool m_SnapEnabled;
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public SnapEngine(IAttractable attractable, IAttractionHandler attractionHandler, ManipulateEdges manipulateEdges, WindowState state,
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Vector2 mousePosition, IEnumerable<ISnappable> snappables = null)
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{
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m_Attractable = attractable;
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m_ManipulateEdges = manipulateEdges;
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m_AttractionHandler = attractionHandler;
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m_State = state;
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m_CurrentTimes = m_GrabbedTimes = new TimeBoundaries(m_Attractable.start, m_Attractable.end);
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m_GrabbedTime = m_State.PixelToTime(mousePosition.x);
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// Add Time zero as Magnet
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AddMagnet(0.0, true, state);
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// Add current Time as Magnet
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// case1157280 only add current time as magnet if visible
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if (TimelineWindow.instance.currentMode.ShouldShowTimeCursor(m_State))
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AddMagnet(state.editSequence.time, true, state);
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if (state.IsEditingASubTimeline())
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{
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// Add start and end of evaluable range as Magnets
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// This includes the case where the master timeline has a fixed length
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var range = state.editSequence.GetEvaluableRange();
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AddMagnet(range.start, true, state);
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AddMagnet(range.end, true, state);
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}
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else if (state.masterSequence.asset.durationMode == TimelineAsset.DurationMode.FixedLength)
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{
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// Add end sequence Time as Magnet
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AddMagnet(state.masterSequence.asset.duration, true, state);
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}
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if (snappables == null)
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snappables = GetVisibleSnappables(m_State);
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foreach (var snappable in snappables)
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{
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if (!attractable.ShouldSnapTo(snappable))
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continue;
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var edges = snappable.SnappableEdgesFor(attractable, manipulateEdges);
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foreach (var edge in edges)
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AddMagnet(edge.time, edge.showSnapHint, state);
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}
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}
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public static IEnumerable<ISnappable> GetVisibleSnappables(WindowState state)
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{
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Rect rect = TimelineWindow.instance.state.timeAreaRect;
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rect.height = float.MaxValue;
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return state.spacePartitioner.GetItemsInArea<ISnappable>(rect).ToArray();
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}
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void AddMagnet(double magnetTime, bool showSnapHint, WindowState state)
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{
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var magnet = m_Magnets.FirstOrDefault(m => m.time.Equals(magnetTime));
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if (magnet == null)
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{
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if (IsMagnetInShownArea(magnetTime, state))
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m_Magnets.Add(new SnapInfo { time = magnetTime, showSnapHint = showSnapHint });
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}
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else
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{
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magnet.showSnapHint |= showSnapHint;
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}
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}
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static bool IsMagnetInShownArea(double time, WindowState state)
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{
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var shownArea = state.timeAreaShownRange;
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return time >= shownArea.x && time <= shownArea.y;
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}
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SnapInfo GetMagnetAt(double time)
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{
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return m_Magnets.FirstOrDefault(m => m.time.Equals(time));
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}
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SnapInfo ClosestMagnet(double time)
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{
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SnapInfo candidate = null;
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var min = double.MaxValue;
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foreach (var magnetInfo in m_Magnets)
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{
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var m = Math.Abs(magnetInfo.time - time);
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if (m < min)
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{
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candidate = magnetInfo;
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min = m;
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}
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}
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if (candidate != null && candidate.IsInInfluenceZone(time, m_State))
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return candidate;
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return null;
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}
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public void Snap(Vector2 currentMousePosition, EventModifiers modifiers)
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{
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var d = m_State.PixelToTime(currentMousePosition.x) - m_GrabbedTime;
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m_CurrentTimes = m_GrabbedTimes.Translate(d);
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bool isLeft = m_ManipulateEdges == ManipulateEdges.Left || m_ManipulateEdges == ManipulateEdges.Both;
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bool isRight = m_ManipulateEdges == ManipulateEdges.Right || m_ManipulateEdges == ManipulateEdges.Both;
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bool attracted = false;
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m_SnapEnabled = modifiers == ManipulatorsUtils.actionModifier ? !m_State.edgeSnaps : m_State.edgeSnaps;
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if (m_SnapEnabled)
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{
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SnapInfo leftActiveMagnet = null;
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SnapInfo rightActiveMagnet = null;
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if (isLeft)
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leftActiveMagnet = ClosestMagnet(m_CurrentTimes.left);
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if (isRight)
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rightActiveMagnet = ClosestMagnet(m_CurrentTimes.right);
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if (leftActiveMagnet != null || rightActiveMagnet != null)
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{
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attracted = true;
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bool leftAttraction = false;
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if (rightActiveMagnet == null)
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{
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// Attracted by a left magnet only.
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leftAttraction = true;
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}
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else
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{
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if (leftActiveMagnet != null)
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{
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// Attracted by both magnets, choose the closest one.
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var leftDistance = Math.Abs(leftActiveMagnet.time - m_CurrentTimes.left);
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var rightDistance = Math.Abs(rightActiveMagnet.time - m_CurrentTimes.right);
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leftAttraction = leftDistance <= rightDistance;
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}
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// else, Attracted by right magnet only
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}
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if (leftAttraction)
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{
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m_AttractionHandler.OnAttractedEdge(m_Attractable, m_ManipulateEdges, AttractedEdge.Left, leftActiveMagnet.time);
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}
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else
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{
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m_AttractionHandler.OnAttractedEdge(m_Attractable, m_ManipulateEdges, AttractedEdge.Right, rightActiveMagnet.time);
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}
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}
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}
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if (!attracted)
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{
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var time = isLeft ? m_CurrentTimes.left : m_CurrentTimes.right;
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time = TimeReferenceUtility.SnapToFrameIfRequired(time);
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m_AttractionHandler.OnAttractedEdge(m_Attractable, m_ManipulateEdges, AttractedEdge.None, time);
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}
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}
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public void OnGUI(bool showLeft = true, bool showRight = true)
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{
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if (displayDebugLayout)
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{
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// Display Magnet influence zone
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foreach (var m in m_Magnets)
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{
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var window = TimelineWindow.instance;
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var rect = new Rect(m_State.TimeToPixel(m.time) - k_MagnetInfluenceInPixels, window.state.timeAreaRect.yMax, 2f * k_MagnetInfluenceInPixels, m_State.windowHeight);
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EditorGUI.DrawRect(rect, new Color(1f, 0f, 0f, 0.4f));
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}
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// Display Cursor position
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var mousePos = Event.current.mousePosition;
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var time = m_State.PixelToTime(mousePos.x);
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var p = new Vector2(m_State.TimeToPixel(time), TimelineWindow.instance.state.timeAreaRect.yMax);
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var s = new Vector2(1f, m_State.windowHeight);
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EditorGUI.DrawRect(new Rect(p, s), Color.blue);
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p = new Vector2(m_State.TimeToPixel(m_GrabbedTime), TimelineWindow.instance.state.timeAreaRect.yMax);
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s = new Vector2(1f, m_State.windowHeight);
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EditorGUI.DrawRect(new Rect(p, s), Color.red);
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p = new Vector2(m_State.TimeToPixel(m_CurrentTimes.left), TimelineWindow.instance.state.timeAreaRect.yMax);
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s = new Vector2(1f, m_State.windowHeight);
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EditorGUI.DrawRect(new Rect(p, s), Color.yellow);
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p = new Vector2(m_State.TimeToPixel(m_CurrentTimes.right), TimelineWindow.instance.state.timeAreaRect.yMax);
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EditorGUI.DrawRect(new Rect(p, s), Color.yellow);
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}
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if (m_SnapEnabled)
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{
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if (showLeft)
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DrawMagnetLineAt(m_Attractable.start);
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if (showRight)
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DrawMagnetLineAt(m_Attractable.end);
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}
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}
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void DrawMagnetLineAt(double time)
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{
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var magnet = GetMagnetAt(time);
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if (magnet != null && magnet.showSnapHint)
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Graphics.DrawLineAtTime(m_State, magnet.time, Color.white);
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}
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}
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}
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