VirtualListView - add a public property: VScrollPos, TASListView - track the row index the mouse is currenlty pointing to

BizHawk.Client.EmuHawk/CustomControls/TasListView.cs

@@ -30,7 +30,14 @@ namespace BizHawk.Client.EmuHawk
 				}
 			}
 
-			// TODO: Get row
+			var headerHeight = 24; //Are these always true? Don't know, is there a way to programmatically determine them?
+			var rowHeight = 18;
+
+			PointedRowIndex = ((y - headerHeight) / rowHeight) + this.VScrollPos;
+			if (PointedRowIndex >= ItemCount)
+			{
+				PointedRowIndex = null;
+			}
 		}
 
 		protected override void OnMouseLeave(EventArgs e)

BizHawk.Client.EmuHawk/CustomControls/VirtualListView.cs

@@ -534,6 +534,17 @@ namespace BizHawk.Client.EmuHawk
 			if (handler != null) handler(this, e);
 		}
 
+		[DllImport("user32.dll", CharSet = CharSet.Auto)]
+		public static extern int GetScrollPos(IntPtr hWnd, System.Windows.Forms.Orientation nBar);
+
+		/// <summary>
+		/// Gets and Sets the Vertical Scroll position of the control.
+		/// </summary>
+		public int VScrollPos
+		{
+			get { return GetScrollPos((IntPtr)this.Handle, System.Windows.Forms.Orientation.Vertical); }
+		}
+		
 		protected override void WndProc(ref System.Windows.Forms.Message m) {
 			NMHDR nm1;
 			bool messageProcessed = false;
@@ -572,7 +583,7 @@ namespace BizHawk.Client.EmuHawk
 
 				case (int)WindowsMessage.WM_SCROLL:
 					//http://stackoverflow.com/questions/1851620/handling-scroll-event-on-listview-in-c-sharp
-					OnScroll(new ScrollEventArgs((ScrollEventType)(m.WParam.ToInt32() & 0xffff), 0));
+					OnScroll(new ScrollEventArgs((ScrollEventType)(m.WParam.ToInt32() & 0xffff), m.WParam.ToInt32()));
 					break;
 
 				//obscure message loop flakiness when exceptions are thrown from the message loop...