--- old/application/org.openjdk.jmc.ui/src/main/java/org/openjdk/jmc/ui/charts/IChartInfoVisitor.java	2019-04-17 12:21:12.244422083 -0400
+++ new/application/org.openjdk.jmc.ui/src/main/java/org/openjdk/jmc/ui/charts/IChartInfoVisitor.java	2019-04-17 12:21:12.172421280 -0400
@@ -40,7 +40,7 @@
 
 /**
  * Visitor interface to gather information about values displayed in charts, typically in the
- * vicinity of some coordinates. Suitable for tooltips, highlighting or snapping.
+ * vicinity of some coordinates. Suitable for tooltips, highlighting, hovering or snapping.
  */
 public interface IChartInfoVisitor {
 	public abstract class Adapter implements IChartInfoVisitor {
@@ -55,6 +55,10 @@
 		}
 
 		@Override
+		public void hover(Object data) {
+		}
+
+		@Override
 		public void visit(IBucket bucket) {
 		}
 
@@ -174,6 +178,16 @@
 	void leaveScope();
 
 	/**
+	 * Deliver supplementary information about the hovered rendered item to the Visitor.
+	 * <p>
+	 * To be used in conjunction with an rendered item's {@code infoAt()} to
+	 * deliver supplementary information about the currently hovered object to the Visitor.
+	 *
+	 * @param data
+	 */
+	void hover(Object data);
+
+	/**
 	 * Visit a bucket in a histogram.
 	 * <p>
 	 * Note that the provided {@link IBucket} instance may be reused and thus cannot be directly