test

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My project/Library/PackageCache/com.unity.timeline/Samples~/Customization/.sample.json

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+{
+	"displayName": "Customization Samples",
+	"description": "This sample demonstrates how to create custom timeline tracks, clips, markers and actions.",
+	"createSeparatePackage": false
+}

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My project/Library/PackageCache/com.unity.timeline/Samples~/Customization/Annotation/AnnotationMarker.cs

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+using System.ComponentModel;
+using UnityEngine;
+using UnityEngine.Timeline;
+
+namespace Timeline.Samples
+{
+    // Uses the USS style defined in `Editor/Stylesheets/Extensions/common.uss`.
+    // See `ReadMe-USS-Styles.md` for more details.
+    [CustomStyle("AnnotationStyle")]
+    [DisplayName("Annotation")]
+    public class AnnotationMarker : Marker // Represents the serialized data for a marker.
+    {
+        public string title;
+        public Color color = new Color(1.0f, 1.0f, 1.0f, 0.5f);
+        public bool showLineOverlay = true;
+        [TextArea(10, 15)] public string description;
+    }
+}

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My project/Library/PackageCache/com.unity.timeline/Samples~/Customization/Annotation/Editor/AnnotationMarkerEditor.cs

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+using System;
+using UnityEditor;
+using UnityEditor.Timeline;
+using UnityEngine;
+using UnityEngine.Timeline;
+
+namespace Timeline.Samples
+{
+    // Editor used by the Timeline window to customize the appearance of an AnnotationMarker
+    [CustomTimelineEditor(typeof(AnnotationMarker))]
+    public class AnnotationMarkerEditor : MarkerEditor
+    {
+        const float k_LineOverlayWidth = 6.0f;
+
+        const string k_OverlayPath = "timeline_annotation_overlay";
+        const string k_OverlaySelectedPath = "timeline_annotation_overlay_selected";
+        const string k_OverlayCollapsedPath = "timeline_annotation_overlay_collapsed";
+
+        static Texture2D s_OverlayTexture;
+        static Texture2D s_OverlaySelectedTexture;
+        static Texture2D s_OverlayCollapsedTexture;
+
+        static AnnotationMarkerEditor()
+        {
+            s_OverlayTexture = Resources.Load<Texture2D>(k_OverlayPath);
+            s_OverlaySelectedTexture = Resources.Load<Texture2D>(k_OverlaySelectedPath);
+            s_OverlayCollapsedTexture = Resources.Load<Texture2D>(k_OverlayCollapsedPath);
+        }
+
+        // Draws a vertical line on top of the Timeline window's contents.
+        public override void DrawOverlay(IMarker marker, MarkerUIStates uiState, MarkerOverlayRegion region)
+        {
+            // The `marker argument needs to be cast as the appropriate type, usually the one specified in the `CustomTimelineEditor` attribute
+            AnnotationMarker annotation = marker as AnnotationMarker;
+            if (annotation == null)
+            {
+                return;
+            }
+
+            if (annotation.showLineOverlay)
+            {
+                DrawLineOverlay(annotation.color, region);
+            }
+
+            DrawColorOverlay(region, annotation.color, uiState);
+        }
+
+        // Sets the marker's tooltip based on its title.
+        public override MarkerDrawOptions GetMarkerOptions(IMarker marker)
+        {
+            // The `marker argument needs to be cast as the appropriate type, usually the one specified in the `CustomTimelineEditor` attribute
+            AnnotationMarker annotation = marker as AnnotationMarker;
+            if (annotation == null)
+            {
+                return base.GetMarkerOptions(marker);
+            }
+
+            return new MarkerDrawOptions { tooltip = annotation.title };
+        }
+
+        static void DrawLineOverlay(Color color, MarkerOverlayRegion region)
+        {
+            // Calculate markerRegion's center on the x axis
+            float markerRegionCenterX = region.markerRegion.xMin + (region.markerRegion.width - k_LineOverlayWidth) / 2.0f;
+
+            // Calculate a rectangle that uses the full timeline region's height
+            Rect overlayLineRect = new Rect(markerRegionCenterX,
+                region.timelineRegion.y,
+                k_LineOverlayWidth,
+                region.timelineRegion.height);
+
+            Color overlayLineColor = new Color(color.r, color.g, color.b, color.a * 0.5f);
+            EditorGUI.DrawRect(overlayLineRect, overlayLineColor);
+        }
+
+        static void DrawColorOverlay(MarkerOverlayRegion region, Color color, MarkerUIStates state)
+        {
+            // Save the Editor's overlay color before changing it
+            Color oldColor = GUI.color;
+            GUI.color = color;
+
+            if (state.HasFlag(MarkerUIStates.Selected))
+            {
+                GUI.DrawTexture(region.markerRegion, s_OverlaySelectedTexture);
+            }
+            else if (state.HasFlag(MarkerUIStates.Collapsed))
+            {
+                GUI.DrawTexture(region.markerRegion, s_OverlayCollapsedTexture);
+            }
+            else if (state.HasFlag(MarkerUIStates.None))
+            {
+                GUI.DrawTexture(region.markerRegion, s_OverlayTexture);
+            }
+
+            // Restore the previous Editor's overlay color
+            GUI.color = oldColor;
+        }
+    }
+}

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My project/Library/PackageCache/com.unity.timeline/Samples~/Customization/Annotation/Editor/CreateAnnotationAction.cs

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+using System.Collections.Generic;
+using System.Linq;
+using UnityEditor;
+using UnityEditor.Timeline;
+using UnityEditor.Timeline.Actions;
+using UnityEngine.Timeline;
+
+namespace Timeline.Samples
+{
+    // Adds an additional item in context menus that will create a new annotation
+    // and sets its description field with the clipboard's contents.
+    [MenuEntry("Create Annotation from clipboard contents")]
+    public class CreateAnnotationAction : TimelineAction
+    {
+        // Specifies the action's prerequisites:
+        // - Invalid (grayed out in the menu) if no text content is in the clipboard;
+        // - NotApplicable (not shown in the menu) if no track is selected;
+        // - Valid (shown in the menu) otherwise.
+        public override ActionValidity Validate(ActionContext context)
+        {
+            // get the current text content of the clipboard
+            string clipboardTextContent = EditorGUIUtility.systemCopyBuffer;
+            if (clipboardTextContent.Length == 0)
+            {
+                return ActionValidity.Invalid;
+            }
+
+            // Timeline's current selected items can be fetched with `context`
+            IEnumerable<TrackAsset> selectedTracks = context.tracks;
+            if (!selectedTracks.Any() || selectedTracks.All(track => track is GroupTrack))
+            {
+                return ActionValidity.NotApplicable;
+            }
+
+            return ActionValidity.Valid;
+        }
+
+        // Creates a new annotation and add it to the selected track.
+        public override bool Execute(ActionContext context)
+        {
+            // to find at which time to create a new marker, we need to consider how this action was invoked.
+            // If the action was invoked by a context menu item, then we can use the context's invocation time.
+            // If the action was invoked through a keyboard shortcut, we can use Timeline's playhead time instead.
+            double time;
+            if (context.invocationTime.HasValue)
+            {
+                time = context.invocationTime.Value;
+            }
+            else
+            {
+                time = TimelineEditor.inspectedDirector.time;
+            }
+
+            string clipboardTextContent = EditorGUIUtility.systemCopyBuffer;
+
+            IEnumerable<TrackAsset> selectedTracks = context.tracks;
+            foreach (TrackAsset track in selectedTracks)
+            {
+                if (track is GroupTrack)
+                    continue;
+
+                AnnotationMarker annotation = track.CreateMarker<AnnotationMarker>(time);
+                annotation.description = clipboardTextContent;
+                annotation.title = "Annotation";
+            }
+
+            return true;
+        }
+    }
+}

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My project/Library/PackageCache/com.unity.timeline/Samples~/Customization/Annotation/Editor/ReplaceAnnotationDescriptionAction.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEditor;
+using UnityEditor.Timeline.Actions;
+using UnityEngine;
+using UnityEngine.Timeline;
+
+namespace Timeline.Samples
+{
+    // Adds an additional item in context menus that will replace an annotation's description field
+    // with the clipboard's contents.
+    [MenuEntry("Replace description with clipboard contents")]
+    public class ReplaceAnnotationDescriptionAction : MarkerAction
+    {
+        // Specifies the action's prerequisites:
+        // - Invalid (grayed out in the menu) if no text content is in the clipboard;
+        // - NotApplicable (not shown in the menu) if the current marker is not an Annotation.
+        public override ActionValidity Validate(IEnumerable<IMarker> markers)
+        {
+            if (!markers.All(marker => marker is AnnotationMarker))
+            {
+                return ActionValidity.NotApplicable;
+            }
+
+            // get the current text content of the clipboard
+            string clipboardTextContent = EditorGUIUtility.systemCopyBuffer;
+            if (clipboardTextContent.Length == 0)
+            {
+                return ActionValidity.Invalid;
+            }
+
+            return ActionValidity.Valid;
+        }
+
+        // Sets the Annotation's description based on the contents of the clipboard.
+        public override bool Execute(IEnumerable<IMarker> markers)
+        {
+            // get the current text content of the clipboard
+            string clipboardTextContent = EditorGUIUtility.systemCopyBuffer;
+
+            foreach (AnnotationMarker annotation in markers.Cast<AnnotationMarker>())
+            {
+                annotation.description = clipboardTextContent;
+            }
+
+            return true;
+        }
+
+        // Assigns a shortcut to the action.
+        [TimelineShortcut("Replace annotation description with clipboard", KeyCode.D)]
+        public static void InvokeShortcut()
+        {
+            Invoker.InvokeWithSelectedMarkers<ReplaceAnnotationDescriptionAction>();
+        }
+    }
+}

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