DebugLog, event bindings resolutions, enumSelector bitfields, wip

1 files changed, 805 insertions, 0 deletions

diff --git a/Samples/DebugLogAnalyzer/src/DbgLogViewer.cs b/Samples/DebugLogAnalyzer/src/DbgLogViewer.cs
new file mode 100644
index 00000000..1273c9e6
--- /dev/null
+++ b/Samples/DebugLogAnalyzer/src/DbgLogViewer.cs
@@ -0,0 +1,805 @@
+using System.Diagnostics;
+using System.Runtime.InteropServices.ComTypes;
+// Copyright (c) 2013-2020  Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
+//
+// This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
+
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Crow.Cairo;
+using Crow.DebugLogger;
+using DebugLogAnalyzer;
+
+namespace Crow
+{
+	public class DbgLogViewer : Widget
+	{
+		public static Dictionary<DbgEvtType, Color> colors;
+
+		public static Configuration colorsConf = new Configuration ("dbgcolor.conf");//, Interface.GetStreamFromPath("#Crow.dbgcolor.conf"));
+
+		public static void reloadColors () {
+			colors = new Dictionary<DbgEvtType, Color>();
+			foreach (string n in colorsConf.Names) {
+				DbgEvtType t = (DbgEvtType)Enum.Parse (typeof(DbgEvtType), n);
+				Color c = colorsConf.Get<Color> (n);
+				colors.Add (t, c);
+			}
+
+		}
+		#region CTOR
+		static DbgLogViewer() {
+			//reloadColors ();
+			
+		}
+		protected DbgLogViewer () : base(){}
+		public DbgLogViewer (Interface iface, string style = null) : base(iface, style){}
+		#endregion
+
+		FontExtents fe;
+
+
+		double xScale = 1.0/1024.0, yScale = 1.0, leftMargin, topMargin = 0.0;
+		DbgWidgetRecord curWidget, hoverWidget;
+		DbgEvent curEvent, hoverEvent;
+
+		List<DbgEvent> events = new List<DbgEvent> ();
+		List<DbgWidgetRecord> widgets = new List<DbgWidgetRecord> ();
+		
+
+		public DbgEvtType Filter {
+			get => Configuration.Global.Get<DbgEvtType> ("DbgLogViewFilter");
+			set {
+				if (Filter == value)
+					return;				
+				Configuration.Global.Set ("DbgLogViewFilter", value);				
+				NotifyValueChangedAuto(Filter);
+				RegisterForGraphicUpdate();
+			}
+		}
+		public List<DbgEvent> Events {
+			get => events;
+			set {
+				if (events == value)
+					return;
+				events = value;
+				NotifyValueChanged (nameof (Events), events);
+
+				maxTicks = minTicks = 0;
+				if (events != null && events.Count > 0) {				
+					minTicks = long.MaxValue;
+					foreach (DbgEvent e in events) {
+						if (e.begin < minTicks)
+							minTicks = e.begin;
+						if (e.end > maxTicks)
+							maxTicks = e.end;
+					}
+					visibleTicks = maxTicks - minTicks;
+					XScale = (ClientRectangle.Width - leftMargin)/visibleTicks;
+					ScrollX = 0;
+					ScrollY = 0;
+				} else {
+					maxTicks = 1;
+					XScale = 1.0/1024.0;					
+				}
+
+
+				RegisterForGraphicUpdate ();
+			}
+		}
+		public List<DbgWidgetRecord> Widgets {
+			get => widgets;
+			set {
+				if (widgets == value)
+					return;
+				widgets = value;
+				NotifyValueChanged (nameof (Widgets), widgets);
+				updateMargins ();
+				updateMaxScrollX ();
+				updateMaxScrollY ();
+			}
+		}
+		public DbgWidgetRecord CurrentWidget {
+			get => curWidget;
+			set {
+				if (curWidget == value)
+					return;
+				curWidget = value;
+				NotifyValueChanged (nameof (CurrentWidget), curWidget);
+				if (CurrentWidget == null)
+					return;
+				if (CurrentWidget.listIndex < scrollY || CurrentWidget.listIndex > scrollY + visibleLines)
+					ScrollY = CurrentWidget.listIndex - (visibleLines / 2);
+				
+				currentLine = CurrentWidget.listIndex;
+				RegisterForRedraw();
+			}
+		}
+		public DbgEvent CurrentEvent {
+			get => curEvent;
+			set {
+				if (curEvent == value)
+					return;
+				/*if (curEvent != null)
+					curEvent.IsSelected = false;*/
+				curEvent = value;
+				if (curEvent != null) {
+					//curEvent.IsSelected = true;
+					if (curEvent is DbgWidgetEvent we) {
+						//CurrentWidget = Widgets [we.InstanceIndex];
+						hoverLine = we.InstanceIndex;
+					}
+					currentTick = curEvent.begin;
+					if (curEvent.begin > minTicks + ScrollX + visibleTicks ||
+						curEvent.end < minTicks + ScrollX) 						
+							ScrollX = curEvent.begin - minTicks - visibleTicks / 2;											
+				}
+				NotifyValueChanged (nameof (CurrentEvent), curEvent);
+				RegisterForRedraw ();
+			}
+		}
+		public DbgWidgetRecord HoverWidget {
+			get => hoverWidget;
+			internal set {
+				if (hoverWidget == value)
+					return;
+				hoverWidget = value;
+				NotifyValueChanged (nameof (HoverWidget), hoverWidget);
+			}
+		}
+
+		public DbgEvent HoverEvent {
+			get => hoverEvent;
+			set {
+				if (hoverEvent == value)
+					return;
+				hoverEvent = value;
+				NotifyValueChanged (nameof (HoverEvent), hoverEvent);
+			}
+		}
+
+		long hoverTick = 0, currentTick, selStart = -1, selEnd = -1, minTicks = 0, maxTicks = 0, visibleTicks = 0;
+		int hoverLine = -1, currentLine = -1;
+		int visibleLines = 1;
+		Point mousePos;
+
+		public double XScale {
+			get => xScale;
+			set {
+				if (xScale == value)
+					return;
+				xScale = value;
+				NotifyValueChanged ("XScale", xScale);
+				updateVisibleTicks ();
+				RegisterForGraphicUpdate ();
+			}
+		}
+		public double YScale {
+			get => yScale;
+			set {
+				if (yScale == value)
+					return;
+				yScale = value;
+				NotifyValueChanged ("YScale", yScale);
+				RegisterForGraphicUpdate ();
+			}
+		}
+		public override Font Font {
+			get { return base.Font; }
+			set {
+				base.Font = value;
+				using (Context gr = new Context (IFace.surf)) {
+					gr.SelectFontFace (Font.Name, Font.Slant, Font.Wheight);
+					gr.SetFontSize (Font.Size);
+
+					fe = gr.FontExtents;
+				}
+				updateMargins ();
+			}
+		}
+
+		void drawEvents (Context ctx, List<DbgEvent> evts)
+		{
+			if (evts == null || evts.Count == 0)
+				return;
+			Rectangle cb = ClientRectangle;
+
+			foreach (DbgEvent evt in evts) {
+				if ((evt.Category & currentFilter) == currentFilter) {
+					if (evt.end - minTicks <= ScrollX)
+						continue;
+					if (evt.begin - minTicks > ScrollX + visibleTicks)
+						break;
+					double penY = topMargin + ClientRectangle.Top;
+
+					if (evt.type.HasFlag (DbgEvtType.Widget)) {
+						DbgWidgetEvent eW = evt as DbgWidgetEvent;
+						int lIdx = eW.InstanceIndex - ScrollY;
+						if (lIdx >= 0 && lIdx <= visibleLines) {
+							
+							penY += (lIdx) * fe.Height; 
+						
+							ctx.SetSource (evt.Color);
+
+							double x = xScale * (evt.begin - minTicks - ScrollX);
+							double w = Math.Max (Math.Max (2.0, 2.0 * xScale), (double)(evt.end - evt.begin) * xScale);
+							if (x < 0.0) {
+								w += x;
+								x = 0.0;
+							}
+							x += leftMargin + cb.Left;
+							double rightDiff = x + w - cb.Right;
+							if (rightDiff > 0)
+								w -= rightDiff;
+							RectangleD r = new RectangleD(x, penY, w, fe.Height);
+							ctx.Rectangle (r);
+							ctx.Fill ();
+							/*if (evt == CurrentEvent) {
+								r.Inflate(2,2);
+								ctx.SetSource(Colors.White);
+								ctx.Rectangle(r);
+								ctx.Stroke();
+							}*/
+						}
+					} else if (evt.type.HasFlag (DbgEvtType.IFace)) {
+						double x = xScale * (evt.begin - minTicks - ScrollX);
+						double w = Math.Max (Math.Max (2.0, 2.0 * xScale), (double)(evt.end - evt.begin) * xScale);
+						if (x < 0.0) {
+							w += x;
+							x = 0.0;
+						}
+						x += leftMargin + cb.Left;
+						double rightDiff = x + w - cb.Right;
+						if (rightDiff > 0)
+							w -= rightDiff;					
+						//ctx.SetSource (0.9,0.9,0.0,0.1);					
+						ctx.SetSource (evt.Color.AdjustAlpha(0.15));
+						ctx.Rectangle (x, cb.Top + topMargin, w, cb.Height);
+						ctx.Fill ();
+					}
+				}
+				drawEvents (ctx, evt.Events);
+			}
+		}
+
+		DbgEvtType currentFilter;
+		protected override void onDraw (Cairo.Context gr)
+		{
+			base.onDraw (gr);
+
+			gr.SelectFontFace (Font.Name, Font.Slant, Font.Wheight);
+			gr.SetFontSize (Font.Size);
+			gr.FontOptions = Interface.FontRenderingOptions;
+			gr.Antialias = Cairo.Antialias.None;
+
+			if (widgets == null)
+				return;
+
+			gr.LineWidth = 1.0;
+
+			Rectangle cb = ClientRectangle;
+
+			double penY = topMargin + ClientRectangle.Top;
+
+			for (int i = 0; i < visibleLines; i++) {
+				if (i + ScrollY >= widgets.Count)
+					break;
+				int gIdx = i + ScrollY;
+				DbgWidgetRecord g = widgets [gIdx];
+
+				penY += fe.Height;
+
+				gr.SetSource (Crow.Colors.Jet);
+				gr.MoveTo (cb.X, penY - 0.5);
+				gr.LineTo (cb.Right, penY - 0.5);
+				gr.Stroke ();
+
+				double penX = 5.0 * g.xLevel + cb.Left;
+
+				if (g.yIndex == 0)
+					gr.SetSource (Crow.Colors.LightSalmon);
+				else if (currentLine == g.listIndex)
+					gr.SetSource(Colors.RoyalBlue);
+				else
+					Foreground.SetAsSource (IFace, gr);
+
+				gr.MoveTo (penX, penY - gr.FontExtents.Descent);
+				gr.ShowText (g.name + gIdx);
+			}
+
+			currentFilter = Filter;
+			drawEvents (gr, events);
+
+			gr.MoveTo (cb.Left, topMargin - 0.5 + cb.Top);
+			gr.LineTo (cb.Right, topMargin - 0.5 + cb.Top);
+
+			gr.MoveTo (leftMargin + cb.Left, cb.Top);
+			gr.LineTo (leftMargin + cb.Left, cb.Bottom);
+			gr.SetSource (Crow.Colors.Grey);
+
+			penY = topMargin + ClientRectangle.Top;
+
+			//graduation
+			long largeGrad = long.Parse ("1" + new string ('0', visibleTicks.ToString ().Length - 1));
+			long smallGrad = Math.Max (1, largeGrad / 10);
+
+			long firstVisibleTicks = minTicks + ScrollX;
+			long curGrad = firstVisibleTicks - firstVisibleTicks % smallGrad + smallGrad;
+
+			long gg = curGrad - ScrollX - minTicks;
+			while (gg < visibleTicks ) {
+				double x = (double)gg * xScale + leftMargin + cb.Left;
+
+				gr.MoveTo (x, penY - 0.5);
+				if (curGrad % largeGrad == 0) { 
+					gr.LineTo (x, penY - 8.5);
+					string str = ticksToMS(curGrad);
+					TextExtents te = gr.TextExtents (str);
+					gr.RelMoveTo (-0.5 * te.Width, -2.0);
+					gr.ShowText (str);
+				}else
+					gr.LineTo (x, penY - 2.5);
+
+				curGrad += smallGrad;
+				gg = curGrad - ScrollX - minTicks;
+			}
+
+			gr.Stroke ();
+
+
+
+		}
+		string ticksToMS(long ticks) => Math.Round ((double)ticks / Stopwatch.Frequency * 1000.0, 2).ToString();
+		public override void Paint (Cairo.Context ctx)
+		{
+			base.Paint (ctx);
+
+			Rectangle r = new Rectangle(mousePos.X, 0, 1, Slot.Height);
+			Rectangle ctxR = ContextCoordinates (r);
+			Rectangle cb = ClientRectangle;
+			ctx.LineWidth = 1.0;
+			if (hoverTick >= 0) {
+				double x = xScale * (hoverTick - minTicks - ScrollX) + leftMargin;
+				if (x - Math.Truncate (x) > 0.5)
+					x = Math.Truncate (x) + 0.5;
+				else
+					x = Math.Truncate (x) - 0.5;
+				ctx.MoveTo (x, cb.Top + topMargin - 4.0);
+				ctx.LineTo (x, cb.Bottom);				
+				ctx.SetSource (0.7,0.7,0.7,0.5);
+				ctx.Stroke();
+			}
+			if (currentTick >= 0) {
+				double x = xScale * (currentTick - minTicks - ScrollX) + leftMargin;
+				if (x > leftMargin && x < cb.Right) {
+					if (x - Math.Truncate (x) > 0.5)
+						x = Math.Truncate (x) + 0.5;
+					else
+						x = Math.Truncate (x) - 0.5;
+					ctx.MoveTo (x, cb.Top);
+					ctx.LineTo (x, cb.Bottom);				
+					ctx.SetSource (0.2,0.7,1.0,0.6);
+					ctx.Stroke();
+				}
+			}
+
+			ctx.SelectFontFace (Font.Name, Font.Slant, Font.Wheight);
+			ctx.SetFontSize (Font.Size);
+			ctx.FontOptions = Interface.FontRenderingOptions;
+			ctx.Antialias = Interface.Antialias;
+
+			string str = ticksToMS(hoverTick);
+
+			ctx.MoveTo (ctxR.X - ctx.TextExtents (str).Width / 2, ctxR.Y + fe.Height);
+			ctx.ShowText (str);
+
+			ctx.Operator = Cairo.Operator.Add;
+
+			if (hoverLine >= 0) {
+				double y = fe.Height * (hoverLine - ScrollY) + topMargin + cb.Top;
+				r = new Rectangle (cb.Left,  (int)y, cb.Width, (int)fe.Height);
+
+				ctx.SetSource (0.1, 0.1, 0.1, 0.4);
+				ctx.Rectangle (ContextCoordinates (r));
+				ctx.Fill ();
+			}
+
+			if (currentLine >= ScrollY && currentLine < scrollY + visibleLines) {
+				double y = fe.Height * (currentLine - ScrollY) + topMargin + cb.Top;
+				r = new Rectangle (cb.Left,  (int)y, cb.Width, (int)fe.Height);
+
+				ctx.SetSource (0.1, 0.1, 0.7, 0.2);
+				ctx.Rectangle (ContextCoordinates (r));
+				ctx.Fill ();
+			}
+
+			if (selStart < 0 || selEnd < 0) {
+				ctx.Operator = Cairo.Operator.Over;
+				return;
+			}
+			double selStartX = (double)(selStart - ScrollX - minTicks) * xScale + leftMargin + cb.Left;
+			double selEndX = (double)(selEnd - ScrollX - minTicks) * xScale + leftMargin + cb.Left;
+
+			if (selStartX < selEndX) {
+				ctxR.X = (int)selStartX;
+				ctxR.Width = (int)(selEndX - selStartX);
+			} else {
+				ctxR.X = (int)selEndX;
+				ctxR.Width = (int)(selStartX - selEndX);
+			}
+
+			ctxR.Width = Math.Max (1, ctxR.Width);
+			ctx.Rectangle (ctxR);
+			//ctx.SetSourceColor (Color.LightYellow);
+			ctx.SetSource (Colors.Jet);
+			ctx.Fill();
+			ctx.Operator = Cairo.Operator.Over;
+
+		}
+		public override void OnLayoutChanges (LayoutingType layoutType)
+		{
+			base.OnLayoutChanges (layoutType);
+			switch (layoutType) {
+			case LayoutingType.Width:
+				if (xScale < 0) {
+					visibleTicks = maxTicks - minTicks;
+					XScale = (ClientRectangle.Width - leftMargin) / visibleTicks;
+				}
+				updateVisibleTicks ();
+				break;
+			case LayoutingType.Height:
+				updateVisibleLines ();
+				break;
+			}
+		}
+
+		public override void onMouseLeave (object sender, MouseMoveEventArgs e)
+		{
+			base.onMouseLeave (sender, e);
+			hoverLine = -1;
+			hoverTick = 0;
+		}
+		public override void onMouseMove (object sender, MouseMoveEventArgs e)
+		{			
+			long lastTick = hoverTick;
+			int lastLine = hoverLine;
+			updateMouseLocalPos (e.Position);
+
+			if (IFace.IsDown (Glfw.MouseButton.Left) && selStart >= 0)
+				selEnd = hoverTick;
+			else if (IFace.IsDown(Glfw.MouseButton.Right)) {
+				if (lastTick >= 0 && hoverTick >= 0)
+					ScrollX += lastTick - hoverTick;
+				if (lastLine >= 0 && hoverLine >= 0)
+				ScrollY += lastLine - hoverLine;
+				updateMouseLocalPos (e.Position);
+			} else {
+				HoverWidget = (hoverLine < 0 || hoverLine >= widgets.Count) ? null : widgets [hoverLine];
+				HoverEvent = hoverWidget?.Events.FirstOrDefault (ev => ev.begin <= hoverTick && ev.end >= hoverTick);
+				Task.Run (() => findHoverEvent (hoverWidget, hoverTick));
+			}
+
+			RegisterForRepaint();
+			
+			e.Handled = true;
+			base.onMouseMove (sender, e);
+		}
+		void findHoverEvent (DbgWidgetRecord widget, long tick) {
+			DbgEvent tmp = widget?.Events.FirstOrDefault (ev => ev.begin <= tick && ev.end >= tick);			
+			if (tmp == null) {
+				tmp = Events.Where(e=>e.type.HasFlag(DbgEvtType.IFace)).Where (ev => ev.begin <= tick && ev.end >= tick).FirstOrDefault();				
+				while(tmp != null) {
+					DbgEvent che = tmp.Events?.Where(e=>e.type.HasFlag(DbgEvtType.IFace)).Where (ev => ev.begin <= tick && ev.end >= tick).FirstOrDefault();
+					if (che == null)
+						break;
+					tmp = che;
+				}
+			} else {
+				while(tmp != null) {
+					DbgEvent che = tmp.Events?.OfType<DbgWidgetEvent>()?.Where(ev=>ev.InstanceIndex == widget.listIndex && ev.begin <= tick && ev.end >= tick).FirstOrDefault();
+					if (che == null)
+						break;
+					tmp = che;
+				}
+			}
+			HoverEvent = tmp;
+		}
+		public override void onMouseClick(object sender, MouseButtonEventArgs e)
+		{
+			if (e.Button == Glfw.MouseButton.Left && selEnd < 0) {
+				currentTick = hoverTick;
+				currentLine = hoverLine;
+				CurrentWidget = hoverWidget;
+				CurrentEvent = hoverEvent;
+			}
+			selStart = -1;
+			selEnd = -1;
+
+			e.Handled = true;
+			base.onMouseClick(sender, e);
+		}
+		public override void onMouseDown (object sender, MouseButtonEventArgs e)
+		{
+			if (e.Button == Glfw.MouseButton.Left) {
+				selStart = hoverTick;
+				selEnd = -1;
+			}
+
+			RegisterForRedraw ();
+			e.Handled = true;
+			base.onMouseDown (sender, e);
+		}
+		public override void onMouseUp (object sender, MouseButtonEventArgs e)
+		{
+
+			if (e.Button == Glfw.MouseButton.Left && selEnd > 0 && selEnd != selStart) {
+				long scrX = 0;
+				if (selStart < selEnd) {
+					visibleTicks = selEnd - selStart;
+					scrX = selStart - minTicks;
+				} else {
+					visibleTicks = selStart - selEnd;
+					scrX = selEnd - minTicks;
+				}
+				XScale = (ClientRectangle.Width - leftMargin) / visibleTicks;
+				ScrollX = scrX;
+			}
+
+			RegisterForRedraw ();
+			e.Handled = true;
+			base.onMouseUp (sender, e);
+		}
+
+		/// <summary> Process scrolling vertically, or if shift is down, vertically </summary>
+		public override void onMouseWheel (object sender, MouseWheelEventArgs e)
+		{			
+			//base.onMouseWheel (sender, e);
+
+			if (IFace.Shift)
+				ScrollX -= (int)((double)(e.Delta * MouseWheelSpeed) / xScale);
+			else if (IFace.Ctrl) {
+				if (e.Delta > 0) {
+					XScale *= 2.0;
+				} else {
+					if (MaxScrollX > 0)
+						XScale *= 0.5;
+				}
+				ScrollX = (long)(hoverTick - (long)((double)Math.Max(0, mousePos.X - (long)leftMargin) / xScale) - minTicks);
+			}else
+				ScrollY -= e.Delta * MouseWheelSpeed;
+		}
+
+		public override void onKeyDown (object sender, KeyEventArgs e)
+		{
+			base.onKeyDown (sender, e);
+
+			if (e.Key == Glfw.Key.F3) {
+				if (selEnd < 0)
+					return;
+				if (selEnd < selStart)
+					zoom (selEnd, selStart);
+				else
+					zoom (selStart, selEnd);
+				selEnd = selStart = -1;
+			}
+		}
+
+		void updateMargins ()
+		{
+			leftMargin = topMargin = 0.0;
+
+			if (widgets == null)
+				return;
+
+			using (Context gr = new Context (IFace.surf)) {
+				double maxNameWidth = 0.0;
+
+				gr.SelectFontFace (Font.Name, Font.Slant, Font.Wheight);
+				gr.SetFontSize (Font.Size);
+
+				foreach (DbgWidgetRecord o in widgets) {
+					double nameWidth = gr.TextExtents (o.name).Width + 5.0 * o.xLevel;
+					if (nameWidth > maxNameWidth)
+						maxNameWidth = nameWidth;
+				}
+
+				leftMargin = 10.5 + maxNameWidth;
+				topMargin = 2.0 * fe.Height;
+
+				RegisterForGraphicUpdate ();
+			}
+		}
+
+		void updateVisibleLines ()
+		{
+			visibleLines = fe.Height < 1 ? 1 : (int)Math.Ceiling (((double)ClientRectangle.Height - topMargin) / fe.Height);
+			NotifyValueChanged ("VisibleLines", visibleLines);
+			updateMaxScrollY ();
+		}
+		void updateVisibleTicks ()
+		{
+			visibleTicks = Math.Max (0, (long)((double)(ClientRectangle.Width - leftMargin) / XScale));
+			NotifyValueChanged ("VisibleTicks", visibleTicks);
+			updateMaxScrollX ();
+		}
+
+		void updateMaxScrollX ()
+		{
+			if (widgets == null) {
+				MaxScrollX = 0;				
+			} else {
+				long tot = maxTicks - minTicks;
+				MaxScrollX = Math.Max (0L, tot - visibleTicks);
+				NotifyValueChanged ("ChildWidthRatio", (double)visibleTicks / tot);
+			}
+		}
+		void updateMaxScrollY ()
+		{
+			if (widgets == null)
+				MaxScrollY = 0;
+			else {
+				MaxScrollY = Math.Max (0, widgets.Count + 1 - visibleLines);
+				NotifyValueChanged ("ChildHeightRatio", (double)visibleLines / (widgets.Count + 1));
+			}
+		}
+
+		void updateMouseLocalPos (Point mPos)
+		{
+			Rectangle r = ScreenCoordinates (Slot);
+			Rectangle cb = ClientRectangle;
+			cb.Left += (int)leftMargin;
+			cb.Width -= (int)leftMargin;
+			cb.Y += (int)topMargin;
+			cb.Height -= (int)topMargin;
+
+			mousePos = mPos - r.Position;
+
+			mousePos.X = Math.Max (cb.X, mousePos.X);
+			mousePos.X = Math.Min (cb.Right, mousePos.X);
+
+			if (mousePos.Y < cb.Top || mousePos.Y > cb.Bottom)
+				hoverLine = -1;
+			else
+				hoverLine = (int)((double)(mousePos.Y - cb.Top) / fe.Height) + ScrollY;
+
+			NotifyValueChanged ("CurrentLine", hoverLine);
+
+			mousePos.Y = Math.Max (cb.Y, mousePos.Y);
+			mousePos.Y = Math.Min (cb.Bottom, mousePos.Y);
+
+			hoverTick = (long)((double)(mousePos.X - cb.X) / xScale) + minTicks + ScrollX;
+			RegisterForRedraw ();
+		}
+		void zoom (long start, long end) {						
+			//Rectangle cb = ClientRectangle;
+			//cb.X += (int)leftMargin;
+			XScale = ((double)ClientRectangle.Width - leftMargin)/(end - start);
+			ScrollX = (int)(start - minTicks);
+		}
+
+
+		long scrollX, maxScrollX;
+		int scrollY, maxScrollY, mouseWheelSpeed;
+
+		/// <summary>
+		/// if true, key stroke are handled in derrived class
+		/// </summary>
+		protected bool KeyEventsOverrides = false;
+
+		/// <summary> Horizontal Scrolling Position </summary>
+		[DefaultValue(0)]
+		public virtual long ScrollX {
+			get => scrollX;
+			set {
+				if (scrollX == value)
+					return;
+
+				long newS = value;
+				if (newS < 0)
+					newS = 0;
+				else if (newS > maxScrollX)
+					newS = maxScrollX;
+
+				if (newS == scrollX)
+					return;
+
+				scrollX = newS;
+
+				NotifyValueChangedAuto (scrollX);
+				RegisterForGraphicUpdate ();
+			}
+		}
+		/// <summary> Vertical Scrolling Position </summary>
+		[DefaultValue(0)]
+		public virtual int ScrollY {
+			get => scrollY;
+			set {
+				if (scrollY == value)
+					return;
+
+				int newS = value;
+				if (newS < 0)
+					newS = 0;
+				else if (newS > maxScrollY)
+					newS = maxScrollY;
+
+				if (newS == scrollY)
+					return;
+
+				scrollY = newS;
+
+				NotifyValueChangedAuto (scrollY);
+				RegisterForGraphicUpdate ();
+
+				if (widgets == null)
+					return;
+
+				Rectangle cb = ClientRectangle;
+				cb.Left += (int)leftMargin;
+				cb.Width -= (int)leftMargin;
+				cb.Y += (int)topMargin;
+				cb.Height -= (int)topMargin;
+
+				if (mousePos.Y < cb.Top || mousePos.Y > cb.Bottom)
+					hoverLine = -1;
+				else
+					hoverLine = (int)((double)(mousePos.Y - cb.Top) / fe.Height) + ScrollY;
+
+				NotifyValueChanged ("CurrentLine", hoverLine);				
+			}
+		}
+		/// <summary> Horizontal Scrolling maximum value </summary>
+		[DefaultValue(0)]
+		public virtual long MaxScrollX {
+			get => maxScrollX;
+			set {
+				if (maxScrollX == value)
+					return;
+
+				maxScrollX = Math.Max(0, value);
+
+				if (scrollX > maxScrollX)
+					ScrollX = maxScrollX;
+
+				NotifyValueChangedAuto (maxScrollX);
+				RegisterForGraphicUpdate ();
+			}
+		}
+		/// <summary> Vertical Scrolling maximum value </summary>
+		[DefaultValue(0)]
+		public virtual int MaxScrollY {
+			get => maxScrollY;
+			set {
+				if (maxScrollY == value)
+					return;
+
+				maxScrollY = Math.Max (0, value);
+
+				if (scrollY > maxScrollY)
+					ScrollY = maxScrollY;
+
+				NotifyValueChangedAuto (maxScrollY);
+				RegisterForGraphicUpdate ();
+			}
+		}
+		/// <summary> Mouse Wheel Scrolling multiplier </summary>
+		[DefaultValue(1)]
+		public virtual int MouseWheelSpeed {
+			get => mouseWheelSpeed;
+			set {
+				if (mouseWheelSpeed == value)
+					return;
+				
+				mouseWheelSpeed = value;
+
+				NotifyValueChangedAuto (mouseWheelSpeed);
+			}
+		}
+	}
+}
+
+