DebugLogViewer, DockTests

3 files changed, 1242 insertions, 0 deletions

diff --git a/Samples/DebugLogViewer/src/DbgEventWidget.cs b/Samples/DebugLogViewer/src/DbgEventWidget.cs
new file mode 100644
index 00000000..570cc2f9
--- /dev/null
+++ b/Samples/DebugLogViewer/src/DbgEventWidget.cs
@@ -0,0 +1,161 @@
+// Copyright (c) 2025  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 Drawing2D;
+using Crow.DebugLogger;
+
+namespace Crow
+{
+	public class DbgEventView : TemplatedContainer {
+		DbgEvent evt;
+		public DbgEvent Event {
+			get => evt;
+			set {
+				if (evt == value)
+					return;
+				evt = value;
+				NotifyValueChangedAuto (evt);
+			}
+		}
+	}
+	public class DbgEventWidget : Widget
+	{
+		public DbgEventWidget (){}
+
+		DbgEvent evt, hoverEvt;
+		long ticksPerPixel;
+		double pixelPerTick;
+
+		object dataMutex = new object();
+
+		public DbgEvent Event {
+			get => evt;
+			set {
+				if (evt == value)
+					return;
+				lock (dataMutex)
+					evt = value;
+				updatePixelPerTicks ();
+				NotifyValueChangedAuto (evt);
+				RegisterForRedraw ();
+			}
+		}
+		public DbgEvent HoverEvent {
+			get => hoverEvt;
+			private set {
+				if (hoverEvt == value)
+					return;
+				lock (dataMutex)
+					evt = value;
+				hoverEvt = value;
+				NotifyValueChangedAuto (hoverEvt);
+			}
+		}
+
+		[DefaultValue ("1000")]
+		public long TicksPerPixel {
+			get => ticksPerPixel;
+			set {
+				if (ticksPerPixel == value)
+					return;
+				ticksPerPixel = value;
+				NotifyValueChangedAuto (ticksPerPixel);
+				if (Width == Measure.Fit)
+					RegisterForLayouting (LayoutingType.Width);
+			}
+		}
+
+		public override int measureRawSize (LayoutingType lt)
+		{
+			updatePixelPerTicks ();
+			if (lt == LayoutingType.Width)
+				contentSize.Width = Event == null ? 0 : (int)Math.Max(pixelPerTick * Event.Duration, 2);
+			
+			return base.measureRawSize (lt);
+		}
+
+		public override void OnLayoutChanges (LayoutingType layoutType)
+		{
+			if (layoutType == LayoutingType.Width)
+				updatePixelPerTicks ();
+
+			base.OnLayoutChanges (layoutType);
+		}
+
+		protected override void onDraw (IContext gr)
+		{
+			lock (dataMutex) {
+
+				if (Event == null) {
+					base.onDraw (gr);
+					return;
+				}
+
+				gr.LineWidth = 1;
+				gr.SetDash (new double [] { 1.0, 3.0 }, 0);
+
+				Rectangle cb = ClientRectangle;
+
+				if (Event.Duration == 0) {
+					gr.SetSource (Event.Color);
+					gr.Rectangle (cb);
+					gr.Fill ();
+					return;
+				}
+
+				drawEvent (gr, cb.Height, Event);
+			}
+		}
+		void drawEvent (IContext ctx, int h, DbgEvent dbge)
+		{
+			double w = Math.Max(dbge.Duration * pixelPerTick, 2.0);
+			double x = (dbge.begin - Event.begin) * pixelPerTick;
+
+			ctx.Rectangle (x, 0, w, h);
+			ctx.SetSource (dbge.Color);
+			/*if (dbge.IsSelected) {
+				ctx.FillPreserve ();
+				ctx.SetSource (1, 1, 1);
+				ctx.Stroke ();
+			}else*/
+				ctx.Fill ();
+
+			if (dbge.Events == null)
+				return;
+			foreach (DbgEvent e in dbge.Events)
+				drawEvent (ctx, h, e);
+		}
+
+		public override void onMouseMove (object sender, MouseMoveEventArgs e)
+		{
+			if (Event != null) {
+				Point m = ScreenPointToLocal (e.Position);
+				long curTick = (long)(m.X / pixelPerTick) + Event.begin;
+				HoverEvent = hoverEvent (Event, curTick);
+
+				e.Handled = true;
+			}			
+			base.onMouseMove (sender, e);
+		}
+
+		DbgEvent hoverEvent (DbgEvent hevt, long curTick){
+			if (hevt.Events != null) {
+				foreach (DbgEvent e in hevt.Events) {
+					if (curTick >= e.begin && curTick <= e.end)
+						return hoverEvent (e, curTick);
+				}
+			}
+			return hevt;
+		}
+		void updatePixelPerTicks ()
+		{
+			if (Width == Measure.Fit)
+				pixelPerTick = 1.0 / ticksPerPixel;
+			else
+				pixelPerTick = Event == null ? 0 : (double)ClientRectangle.Width / Event.Duration;
+		}		
+	}
+}
\ No newline at end of file
diff --git a/Samples/DebugLogViewer/src/DbgLogViewer.cs b/Samples/DebugLogViewer/src/DbgLogViewer.cs
new file mode 100644
index 00000000..265f031c
--- /dev/null
+++ b/Samples/DebugLogViewer/src/DbgLogViewer.cs
@@ -0,0 +1,800 @@
+// Copyright (c) 2013-2025  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 Drawing2D;
+using Crow.DebugLogger;
+using System.Diagnostics;
+
+namespace Crow
+{
+	public class DbgLogViewer : Widget
+	{
+		public static Dictionary<DbgEvtType, Color> colors;
+
+		#region CTOR
+		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;
+
+		IList<DbgEvent> events = new List<DbgEvent> ();
+		IList<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 IList<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 IList<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);
+				RegisterForRepaint ();
+			}
+		}
+
+		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 (IContext gr = IFace.Backend.CreateContext (IFace.MainSurface)) {
+					gr.SelectFontFace (Font.Name, Font.Slant, Font.Wheight);
+					gr.SetFontSize (Font.Size);
+
+					fe = gr.FontExtents;
+				}
+				updateMargins ();
+			}
+		}
+		RectangleD getWidgetEvtBounds (DbgEvent evt, ref Rectangle cb, double penY) {
+			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;
+			return new RectangleD(x, penY, w, fe.Height);
+		}
+		void drawEvents (IContext ctx, IList<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);
+							RectangleD r = getWidgetEvtBounds (evt, ref cb, penY);
+							if (r.Width > 0){
+								ctx.Rectangle (r.X,r.Y,r.Width,r.Height);
+								ctx.Fill ();
+							}
+						}
+					} 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(0.13));
+						ctx.Rectangle (x, cb.Top + topMargin, w, cb.Height);
+						ctx.Fill ();
+					}
+				}
+				drawEvents (ctx, evt.Events);
+			}
+		}
+
+		DbgEvtType currentFilter;
+		protected override void onDraw (IContext gr)
+		{
+			base.onDraw (gr);
+
+			gr.SelectFontFace (Font.Name, Font.Slant, Font.Wheight);
+			gr.SetFontSize (Font.Size);
+
+			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 (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.xLevel == 0)
+					gr.SetSource (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 (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 bool Paint (IContext 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);
+
+			string str = ticksToMS(hoverTick);
+
+			ctx.MoveTo (ctxR.X - ctx.TextExtents (str).Width / 2, ctxR.Y + fe.Height);
+			ctx.ShowText (str);
+
+			ctx.Operator = 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 (hoverEvent is DbgWidgetEvent wevt) {
+					ctx.SetSource (1.0,1.0,1.0,0.7);
+					ctx.SetDash (new double[] {1, 2});
+					ctx.Rectangle ((Rectangle)getWidgetEvtBounds (wevt, ref cb, y).Inflated (1), 1);
+				}
+			}
+
+			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 = Operator.Over;
+				return true;
+			}
+			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.SetSource (0.0,0.2,0.8,0.15);
+			//ctx.SetSource (Colors.Jet);
+			ctx.Fill();
+			ctx.Operator = Operator.Over;
+
+			str = $"{ticksToMS(Math.Abs (selEnd - selStart))} (ms)";
+
+			ctx.MoveTo (ctxR.Center.X - ctx.TextExtents (str).Width / 2, ctxR.Y + fe.Height);
+			ctx.SetSource (Colors.Black);
+			ctx.ShowText (str);
+
+			return true;
+		}
+		public override void OnLayoutChanges (LayoutingType layoutType)
+		{
+			base.OnLayoutChanges (layoutType);
+			switch (layoutType) {
+			case LayoutingType.Width:
+				if (xScale < 0) {
+					visibleTicks = maxTicks - minTicks;
+					XScale = (ClientRectangle.Width - leftMargin) / visibleTicks;
+				}
+				updateVisibleTicks ();
+				break;
+			case LayoutingType.Height:
+				updateVisibleLines ();
+				break;
+			}
+		}
+
+		public override void onMouseLeave (object sender, MouseMoveEventArgs e)
+		{
+			base.onMouseLeave (sender, e);
+			hoverLine = -1;
+			hoverTick = 0;
+		}
+		public override void onMouseMove (object sender, MouseMoveEventArgs e)
+		{
+			long lastTick = hoverTick;
+			int lastLine = hoverLine;
+			updateMouseLocalPos (e.Position);
+
+			if ((IFace.IsDown (Glfw.MouseButton.Left) || IFace.IsDown (Glfw.MouseButton.Middle)) && selStart >= 0)
+				selEnd = hoverTick;
+			else if (IFace.IsDown(Glfw.MouseButton.Right)) {
+				if (lastTick >= 0 && hoverTick >= 0)
+					ScrollX += lastTick - hoverTick;
+				if (lastLine >= 0 && hoverLine >= 0)
+					ScrollY += lastLine - hoverLine;
+				updateMouseLocalPos (e.Position);
+			} else if (widgets != null) {
+				HoverWidget = (hoverLine < 0 || hoverLine >= widgets.Count) ? null : widgets [hoverLine];
+				//HoverEvent = hoverWidget?.Events.FirstOrDefault (ev => ev.begin <= hoverTick && ev.end >= hoverTick);
+				double tickPerPixel = (double)visibleTicks / ClientRectangle.Width;
+				//Console.WriteLine ($"ticks per pixel: {tickPerPixel}");
+				Task.Run (() => findHoverEvent (hoverWidget, hoverTick, (int)tickPerPixel));
+			}
+
+			RegisterForRepaint();
+
+			e.Handled = true;
+			base.onMouseMove (sender, e);
+		}
+		void findHoverEvent (DbgWidgetRecord widget, long tick, long precision = 0) {
+			DbgEvent tmp = widget?.Events.FirstOrDefault (ev => ev.begin - precision <= tick && ev.end + precision >= tick);
+			if (tmp == null) {
+				tmp = Events.Where(e=>e.type.HasFlag(DbgEvtType.IFace)).Where (ev => ev.begin - precision <= tick && ev.end + precision >= tick).FirstOrDefault();
+				while(tmp != null) {
+					DbgEvent che = tmp.Events?.Where(e=>e.type.HasFlag(DbgEvtType.IFace)).Where (ev => ev.begin - precision <= tick && ev.end + precision >= 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 - precision <= tick && ev.end + precision >= tick).FirstOrDefault();
+					if (che == null)
+						break;
+					tmp = che;
+				}
+			}
+			HoverEvent = tmp;
+		}
+		public override void onMouseClick(object sender, MouseButtonEventArgs e)
+		{
+			if (e.Button == Glfw.MouseButton.Left) {
+				if (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 || e.Button == Glfw.MouseButton.Middle) {
+				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)
+				ScrollY -= e.Delta * MouseWheelSpeed;
+			else {
+				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);
+			}
+		}
+
+		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 (IContext gr = IFace.Backend.CreateContext (IFace.MainSurface)) {
+				gr.SelectFontFace (Font.Name, Font.Slant, Font.Wheight);
+				gr.SetFontSize (Font.Size);
+				
+				double maxNameWidth = 0.0;
+
+				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);
+			}
+		}
+	}
+}
+
+
diff --git a/Samples/DebugLogViewer/src/main.cs b/Samples/DebugLogViewer/src/main.cs
new file mode 100644
index 00000000..ac1c9d37
--- /dev/null
+++ b/Samples/DebugLogViewer/src/main.cs
@@ -0,0 +1,281 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using Crow;
+using Crow.DebugLogger;
+using Drawing2D;
+using Glfw;
+using Samples;
+
+namespace DebugLogViewer
+{
+	class DebugLogViewer : Interface {
+		static void Main (string[] args) {
+			using (DebugLogViewer app = new DebugLogViewer ())
+				app.Run ();
+		}
+
+		public DebugLogViewer () : base (Configuration.Global.Get<int>("MainWinWidth", 800), Configuration.Global.Get<int>("MainWinHeight", 600), true) { }
+		public override void ProcessResize(Rectangle bounds)
+		{
+			base.ProcessResize(bounds);
+			Configuration.Global.Set ("MainWinWidth", clientRectangle.Width);
+			Configuration.Global.Set ("MainWinHeight", clientRectangle.Height);
+			//Console.WriteLine($"{clientRectangle.Width}x{clientRectangle.Height}");
+		}
+		protected override void OnInitialized () {
+			base.OnInitialized ();
+
+			initCommands ();
+
+			SetWindowIcon ("#Crow.Icons.crow.png");
+
+			if (ReopenLastLog)
+				loadLog(CurrentLogFilePath);
+
+			Load ("#ui.main.crow").DataSource = this;
+		}
+
+		#region Commands
+		public Command CMDQuit, CMDHelp, CMDAbout, CMDOptions;
+		public Command CMDStartRecording, CMDStopRecording, CMDRefresh, CMDAddEventToRecord, CMDRemoveEventToRecord;
+		public Command CMDGotoParentEvent, CMDEventHistoryForward, CMDEventHistoryBackward;
+		public CommandGroup LoggerCommands => new CommandGroup (CMDRefresh, CMDStartRecording, CMDStopRecording);
+		public CommandGroup EventCommands => new CommandGroup(
+				CMDGotoParentEvent, CMDEventHistoryBackward, CMDEventHistoryForward);
+		public CommandGroup CommandsRoot, FileCommands;
+
+		void initCommands ()
+		{
+			FileCommands = new CommandGroup ("File",
+				new ActionCommand("Open Log...", openFileDialog, "#icons.outbox.svg"),
+				new ActionCommand("Options", openOptionsDialog, "#icons.tools.svg"),
+				new ActionCommand("Quit", base.Quit, "#icons.sign-out.svg")
+			);
+			
+
+			CMDGotoParentEvent = new ActionCommand("parent", ()=> { CurrentEvent = CurrentEvent?.parentEvent; }, "#icons.level-up.svg", false);
+			CMDEventHistoryBackward = new ActionCommand("back.", currentEventHistoryGoBack, "#icons.previous.svg", false);
+			CMDEventHistoryForward = new ActionCommand("forw.", currentEventHistoryGoForward, "#icons.forward-arrow.svg", false);
+
+			CMDHelp = new ActionCommand("Help", () => System.Diagnostics.Debug.WriteLine("help"), "#icons.question.svg");
+
+			CommandsRoot = new CommandGroup (
+				FileCommands,
+				new CommandGroup ("Help", CMDHelp)
+			);
+		}
+		void openOptionsDialog() =>	Load ("#ui.Options.crow").DataSource = this;
+		void openFileDialog() =>
+			LoadIMLFragment (
+				@"<FileDialog Width='60%' Height='50%' Caption='Open Log File' AlwaysOnTop='true'
+					CurrentDirectory='{²CurrentDir}'
+					SelectedFile='{²CurrentLogFileName}'
+					OkClicked='openFileDialog_OkClicked'/>").DataSource = this;
+
+		void openFileDialog_OkClicked (object sender, EventArgs e)
+		{
+			loadLog (CurrentLogFilePath);
+		}
+
+		#endregion
+
+
+		IList<DbgEvent> events;
+		IList<DbgWidgetRecord> widgets;
+
+		public string CurrentDir {
+			get => Configuration.Global.Get<string>("CurrentDir", Environment.GetFolderPath (Environment.SpecialFolder.MyDocuments));
+			set {
+				if (CurrentDir == value)
+					return;
+				Configuration.Global.Set ("CurrentDir", value);
+				NotifyValueChanged (CurrentDir);
+			}
+		}
+		public string CurrentLogFileName {
+			get => Configuration.Global.Get<string> ("CurrentLogFileName");
+			set {
+				if (CurrentLogFileName == value)
+					return;
+				Configuration.Global.Set ("CurrentLogFileName", value);
+				NotifyValueChanged (value);
+			}
+		}
+		public string CurrentLogFilePath => Path.Combine(CurrentDir,CurrentLogFileName);
+		public bool ReopenLastLog
+		{
+			get => Configuration.Global.Get<bool> ("ReopenLastLog", true); 
+			set {
+				if (ReopenLastLog == value)
+					return;
+				Configuration.Global.Set ("ReopenLastLog", value);
+				NotifyValueChanged (value);
+			}
+		}
+		
+		public IList<DbgEvent> Events {
+			get => events;
+			set {
+				if (events == value)
+					return;
+				events = value;
+				NotifyValueChanged (nameof (Events), events);
+			}
+		}
+		public IList<DbgWidgetRecord> Widgets {
+			get => widgets;
+			set {
+				if (widgets == value)
+					return;
+				widgets = value;
+				NotifyValueChanged (nameof (Widgets), widgets);
+			}
+		}
+
+		void loadLog (string logFile) {
+			if (!File.Exists(logFile))
+				return;
+			//lock(UpdateMutex) {
+				using (Stream stream = new FileStream (logFile, FileMode.Open, FileAccess.Read)) {
+					List<DbgWidgetRecord> widgets = new List<DbgWidgetRecord>();
+					List<DbgEvent> events = new List<DbgEvent>();
+					DbgLogger.Load (stream, events, widgets);
+
+					for (int i = 0; i < widgets.Count; i++) {
+						widgets[i].listIndex = i;
+						//Widgets.Add	(widgets[i]);
+					}
+					for (int i = 0; i < events.Count; i++) {
+						//Events.Add (events[i]);
+						updateWidgetEvents (widgets, events[i]);
+					}
+				
+					Events = events;
+					Widgets = widgets;
+				}
+			//}
+		}
+		void updateWidgetEvents (IList<DbgWidgetRecord> widgets, DbgEvent evt) {
+			if (evt is DbgWidgetEvent we)
+				widgets.FirstOrDefault (w => w.InstanceIndex == we.InstanceIndex)?.Events.Add (we);
+			if (evt.Events == null)
+				return;
+			foreach (DbgEvent e in evt.Events)
+				updateWidgetEvents (widgets, e);
+		}
+		void saveLogToDebugLogFilePath () {
+
+		}
+		void loadLogFromDebugLogFilePath () {
+
+		}
+
+		DbgEvent curEvent;
+		bool disableCurrentEventHistory;
+		Stack<DbgEvent> CurrentEventHistoryForward = new Stack<DbgEvent>();
+		Stack<DbgEvent> CurrentEventHistoryBackward = new Stack<DbgEvent>();
+		DbgWidgetRecord curWidgetRecord = new DbgWidgetRecord();
+		public string[] AllEventTypes => Enum.GetNames (typeof(DbgEvtType));
+		string searchEventType;
+		DbgWidgetRecord searchWidget;
+		public string SearchEventType {
+			get => searchEventType;
+			set {
+				if (searchEventType == value)
+					return;
+				searchEventType = value;
+				NotifyValueChanged (searchEventType);
+			}
+		}
+		public DbgWidgetRecord SearchWidget {
+			get => searchWidget;
+			set {
+				if (searchWidget == value)
+					return;
+				searchWidget = value;
+				NotifyValueChanged (searchWidget);
+			}
+		}
+		
+		public DbgEvent CurrentEvent {
+			get => curEvent;
+			set {
+				if (curEvent == value)
+					return;
+
+				if (!disableCurrentEventHistory) {
+					CurrentEventHistoryForward.Clear ();
+					CMDEventHistoryForward.CanExecute = false;
+					if (!(value == null || curEvent == null)) {
+						CurrentEventHistoryBackward.Push (curEvent);
+						CMDEventHistoryBackward.CanExecute = true;
+					}
+				}
+
+				curEvent = value;
+
+				NotifyValueChanged (nameof (CurrentEvent), curEvent);
+				NotifyValueChanged ("CurEventChildEvents", curEvent?.Events);
+				NotifyValueChanged ("CurWidgetProperties", CurWidgetProperties);
+
+				if (CurrentEvent != null && CurrentEvent.parentEvent != null)
+					CMDGotoParentEvent.CanExecute = true;
+				else
+					CMDGotoParentEvent.CanExecute = false;
+			}
+		}
+		public DbgWidgetRecord CurrentWidget {
+			get => curWidgetRecord;
+			set {
+				if (curWidgetRecord == value)
+					return;
+				curWidgetRecord = value;
+				NotifyValueChanged ("CurrentWidget", curWidgetRecord);
+				NotifyValueChanged ("CurWidgetRootEvents", curWidgetRecord?.RootEvents);
+				NotifyValueChanged ("CurrentWidgetEvents", curWidgetRecord?.Events);
+				NotifyValueChanged ("CurWidgetProperties", CurWidgetProperties);
+			}
+		}
+		public List<DbgWidgetEvent> CurWidgetRootEvents => curWidgetRecord == null? new List<DbgWidgetEvent>() : curWidgetRecord.RootEvents;
+
+		public IEnumerable<KeyValuePair<string, string>> CurWidgetProperties {
+			get {
+				if (curWidgetRecord == null)
+					return null;
+				long endTime = curEvent == null ? long.MaxValue : curEvent.end;
+				Dictionary<string, string> result = new Dictionary<string, string> ();
+				foreach (DbgWidgetEvent evt in curWidgetRecord?.Events?.Where (e => e.type == DbgEvtType.GOSetProperty && e.begin <= endTime)){
+					string[] tmp = evt.Message.Split('=');
+					if (result.ContainsKey (tmp[0]))
+						result[tmp[0]] = tmp[1];
+					else
+						result.Add (tmp[0], tmp[1]);
+				}
+				return result;
+			}
+		}
+
+		void currentEventHistoryGoBack () {
+			disableCurrentEventHistory = true;
+			if (CurrentEvent != null) {
+				CurrentEventHistoryForward.Push (CurrentEvent);
+				CMDEventHistoryForward.CanExecute = true;
+			}
+			CurrentEvent = CurrentEventHistoryBackward.Pop ();
+			CMDEventHistoryBackward.CanExecute = CurrentEventHistoryBackward.Count > 0;
+
+			disableCurrentEventHistory = false;
+		}
+		void currentEventHistoryGoForward () {
+			disableCurrentEventHistory = true;
+			CurrentEventHistoryBackward.Push (CurrentEvent);
+			CMDEventHistoryBackward.CanExecute = true;
+			CurrentEvent = CurrentEventHistoryForward.Pop ();
+			CMDEventHistoryForward.CanExecute = CurrentEventHistoryForward.Count > 0;
+
+			disableCurrentEventHistory = false;
+		}
+	}
+}