From f4762349a9956bd7ae4fc11f1e165eafb0d2c444 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Jean-Philippe=20Bruy=C3=A8re?= <jp_bruyere@hotmail.com>
Date: Mon, 7 Dec 2020 12:37:23 +0100
Subject: [PATCH] stickyMouse, dragNdrop + mdiWins debug and tests

---
 Crow.sln                                      | 18 +++-
 Crow/Default.style                            |  7 +-
 Crow/Templates/DockWindow.template            | 13 ++-
 Crow/src/Fill/BmpPicture.cs                   |  4 +-
 Crow/src/IML/Instantiator.cs                  |  2 +-
 Crow/src/Interface.cs                         | 89 +++++++++++++------
 Crow/src/ItemTemplate.cs                      | 20 +++++
 Crow/src/Mono.Cairo/Context.cs                |  4 +-
 Crow/src/Mono.Cairo/NativeMethods.cs          |  2 +-
 Crow/src/Widgets/DockStack.cs                 | 21 ++---
 Crow/src/Widgets/DockWindow.cs                | 22 +++--
 Crow/src/Widgets/Group.cs                     |  2 +-
 Crow/src/Widgets/PrivateContainer.cs          |  2 +-
 Crow/src/Widgets/TabItem.cs                   |  4 +-
 Crow/src/Widgets/Widget.cs                    | 66 ++++++++++----
 Crow/src/Widgets/Window.cs                    | 48 +++++-----
 Samples/Directory.Build.props                 |  2 +-
 Samples/ShowCase/ShowCase.cs                  |  4 +-
 Samples/common/samples.style                  |  3 +
 Samples/common/ui/Interfaces/Divers/2.crow    |  5 +-
 .../ui/Interfaces/Experimental/testDock.crow  | 10 +--
 .../ui/Interfaces/Experimental/testStack.crow |  2 +-
 Samples/dockableWindows/dockableWindows.cs    | 33 +++++++
 .../dockableWindows/dockableWindows.csproj    | 13 +++
 Samples/dockableWindows/ui/GTreeExp.itemp     | 32 +++++++
 Samples/dockableWindows/ui/test.crow          | 44 +++++++++
 Samples/dragNdrop/dragNdrop.cs                | 65 ++++++++++++++
 Samples/dragNdrop/dragNdrop.csproj            |  8 ++
 Samples/dragNdrop/ui/GTreeExp.itemp           | 32 +++++++
 Samples/dragNdrop/ui/test.crow                | 55 ++++++++++++
 30 files changed, 518 insertions(+), 114 deletions(-)
 create mode 100644 Samples/dockableWindows/dockableWindows.cs
 create mode 100644 Samples/dockableWindows/dockableWindows.csproj
 create mode 100644 Samples/dockableWindows/ui/GTreeExp.itemp
 create mode 100644 Samples/dockableWindows/ui/test.crow
 create mode 100644 Samples/dragNdrop/dragNdrop.cs
 create mode 100644 Samples/dragNdrop/dragNdrop.csproj
 create mode 100644 Samples/dragNdrop/ui/GTreeExp.itemp
 create mode 100644 Samples/dragNdrop/ui/test.crow

diff --git a/Crow.sln b/Crow.sln
index ee474496..8f6e3f3d 100644
--- a/Crow.sln
+++ b/Crow.sln
@@ -8,7 +8,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "global", "global", "{728545
 		README.md = README.md
 	EndProjectSection
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Crow", "Crow\Crow.csproj", "{C2980F9B-4798-4C05-99E2-E174810F7C7B}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Crow", "Crow\Crow.csproj", "{C2980F9B-4798-4C05-99E2-E174810F7C7B}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Samples", "Samples", "{B2C7855A-2878-47FD-AD32-9A83DB4AB8C6}"
 	ProjectSection(SolutionItems) = preProject
@@ -27,7 +27,11 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "BasicTests", "Samples\Basic
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "PerfTests", "Samples\PerfTests\PerfTests.csproj", "{18EBB41F-815E-4BF5-B80F-C9E2FAB2993A}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DebugLogAnalyzer", "Samples\DebugLogAnalyzer\DebugLogAnalyzer.csproj", "{7915538F-B2B1-414C-95A3-1FC58E3286B9}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DebugLogAnalyzer", "Samples\DebugLogAnalyzer\DebugLogAnalyzer.csproj", "{7915538F-B2B1-414C-95A3-1FC58E3286B9}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "dragNdrop", "Samples\dragNdrop\dragNdrop.csproj", "{6E361E34-D266-4BEB-97F4-E209E01C6246}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "dockableWindows", "Samples\dockableWindows\dockableWindows.csproj", "{E19FD3DB-902A-4C99-8BF0-5ACAFFE35608}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -65,6 +69,14 @@ Global
 		{7915538F-B2B1-414C-95A3-1FC58E3286B9}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{7915538F-B2B1-414C-95A3-1FC58E3286B9}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{7915538F-B2B1-414C-95A3-1FC58E3286B9}.Release|Any CPU.Build.0 = Release|Any CPU
+		{6E361E34-D266-4BEB-97F4-E209E01C6246}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6E361E34-D266-4BEB-97F4-E209E01C6246}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6E361E34-D266-4BEB-97F4-E209E01C6246}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6E361E34-D266-4BEB-97F4-E209E01C6246}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E19FD3DB-902A-4C99-8BF0-5ACAFFE35608}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E19FD3DB-902A-4C99-8BF0-5ACAFFE35608}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E19FD3DB-902A-4C99-8BF0-5ACAFFE35608}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E19FD3DB-902A-4C99-8BF0-5ACAFFE35608}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -76,6 +88,8 @@ Global
 		{7AEB6DD5-916E-4415-84E1-78EC6E5881CE} = {B2C7855A-2878-47FD-AD32-9A83DB4AB8C6}
 		{18EBB41F-815E-4BF5-B80F-C9E2FAB2993A} = {B2C7855A-2878-47FD-AD32-9A83DB4AB8C6}
 		{7915538F-B2B1-414C-95A3-1FC58E3286B9} = {B2C7855A-2878-47FD-AD32-9A83DB4AB8C6}
+		{6E361E34-D266-4BEB-97F4-E209E01C6246} = {B2C7855A-2878-47FD-AD32-9A83DB4AB8C6}
+		{E19FD3DB-902A-4C99-8BF0-5ACAFFE35608} = {B2C7855A-2878-47FD-AD32-9A83DB4AB8C6}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {00D4E149-7131-49F4-BAAD-559AA961A78E}
diff --git a/Crow/Default.style b/Crow/Default.style
index cbc9dcba..04cb01dc 100644
--- a/Crow/Default.style
+++ b/Crow/Default.style
@@ -124,7 +124,9 @@ Slider {
 }
 Splitter {
 	Focusable = "true";
-	Margin = "1";
+	Margin = "0";
+	StickyMouseEnabled="true";
+	StickyMouse="10";
 	Background = "Grey";
 }
 
@@ -175,7 +177,8 @@ Docker {
 	Focusable="true";
 }
 DockStack {
-	Margin="1";
+	Margin="2";
+	Spacing="2";
 	AllowDrop = "true";
 	Focusable="true";
 	//DragEnter="{Background=Blue}";
diff --git a/Crow/Templates/DockWindow.template b/Crow/Templates/DockWindow.template
index e62672bc..9a2bd3b4 100644
--- a/Crow/Templates/DockWindow.template
+++ b/Crow/Templates/DockWindow.template
@@ -1,12 +1,9 @@
 <?xml version="1.0"?>
-<!--<Widget Background="{./Background}"/>-->
-<Border BorderWidth="1" Foreground="Black" CornerRadius="{./CornerRadius}"
-				Background="{./Background}"
-				MouseEnter="./onBorderMouseEnter"
-				MouseLeave="./onBorderMouseLeave">
+<Border Name="SizeHandle" BorderWidth="1" Foreground="Black" CornerRadius="{./CornerRadius}" StickyMouse="8" StickyMouseEnabled="{./IsFloating}"
+				Background="{./Background}">
 	<VerticalStack Spacing="0">
 		<HorizontalStack Visible="{./IsDocked}" Height="Fit" Margin="1" Background="vgradient|0:0.3,0.5,0.8,0.9|1:0.1,0.1,0.1,0.9">
-			<Label  Text="{./Caption}" TextAlignment="Left" Width="Stretched"
+			<Label  Text="{./CurDir}" TextAlignment="Left" Width="Stretched"
 					 Foreground="White" />
 			<Border CornerRadius="6" BorderWidth="1" Foreground="Transparent"  Height="10" Width="10"
 				MouseEnter="{Foreground=White}" MouseLeave="{Foreground=Transparent}">
@@ -16,9 +13,9 @@
 		</HorizontalStack>
 		<HorizontalStack Background="vgradient|0:0.5,0.6,0.5,0.5|1:0.2,0.3,0.3,0.7"
 				Name="hs" Margin="0" Spacing="0" Height="Fit" Visible="{./IsFloating}">
-			<Widget Width="5"/>
+			<Widget Width="5"/>			
 			<Image Margin="1" Width="10" Height="10" Path="{./Icon}"/>
-			<Label Width="Stretched" Foreground="White" Margin="1" TextAlignment="Left" Text="{./Caption}" />
+			<Label Width="Stretched" Foreground="White" Margin="1" TextAlignment="Left" Text="{./CurDir}" />
 			<Border CornerRadius="6" BorderWidth="1" Foreground="Transparent"  Height="10" Width="10"
 				MouseEnter="{Foreground=White}" MouseLeave="{Foreground=Transparent}">
 				<Image Focusable="true" Name="Image" Margin="0" Path="#Crow.Icons.exit2.svg"
diff --git a/Crow/src/Fill/BmpPicture.cs b/Crow/src/Fill/BmpPicture.cs
index c000628d..1aade935 100644
--- a/Crow/src/Fill/BmpPicture.cs
+++ b/Crow/src/Fill/BmpPicture.cs
@@ -125,7 +125,7 @@ namespace Crow
 
 					using (ImageSurface imgSurf = new ImageSurface (image, Format.Argb32, 
 						Dimensions.Width, Dimensions.Height, 4 * Dimensions.Width)) {
-						gr.SetSourceSurface (imgSurf, 0,0);
+						gr.SetSource (imgSurf, 0,0);
 						gr.Paint ();
 					}
 				}
@@ -166,7 +166,7 @@ namespace Crow
 			
 			using (ImageSurface imgSurf = new ImageSurface (image, Format.Argb32, 
 				Dimensions.Width, Dimensions.Height, 4 * Dimensions.Width)) {
-				gr.SetSourceSurface (imgSurf, 0,0);
+				gr.SetSource (imgSurf, 0,0);
 				gr.Paint ();
 			}
 			gr.Restore ();
diff --git a/Crow/src/IML/Instantiator.cs b/Crow/src/IML/Instantiator.cs
index 7a4ca5a6..ac203f08 100644
--- a/Crow/src/IML/Instantiator.cs
+++ b/Crow/src/IML/Instantiator.cs
@@ -155,7 +155,7 @@ namespace Crow.IML {
 		Delegate templateBinding;
 
 #if DESIGN_MODE
-		public List<DynamicMethod> DsValueChangedDynMeths =>dsValueChangedDynMeths;
+		public List<DynamicMethod> DsValueChangedDynMeths => dsValueChangedDynMeths;
 		public List<Delegate> CachedDelegates => cachedDelegates;
 		/// <summary>
 		/// store indices of template delegate to be handled by root parentChanged event
diff --git a/Crow/src/Interface.cs b/Crow/src/Interface.cs
index d11070f8..a9a9fa1b 100644
--- a/Crow/src/Interface.cs
+++ b/Crow/src/Interface.cs
@@ -314,6 +314,8 @@ namespace Crow
 		public static string CROW_CONFIG_ROOT;
 		/// <summary>If true, mouse focus is given when mouse is over control</summary>
 		public static bool FOCUS_ON_HOVER = false;
+		/// <summary>If true, newly focused window will be put on top</summary>
+		public static bool RAISE_WIN_ON_FOCUS = true;
 		/// <summary> Threshold to catch borders for sizing </summary>
 		public static int BorderThreshold = 3;
 		/// <summary> delay before tooltip appears </summary>
@@ -354,6 +356,9 @@ namespace Crow
 		//public event EventHandler<MouseCursorChangedEventArgs> MouseCursorChanged;
 		////public event EventHandler Quit;
 		public event EventHandler Initialized;
+
+		public event EventHandler StartDragOperation;
+		public event EventHandler EndDragOperation;
 		//public event EventHandler<MouseWheelEventArgs> MouseWheelChanged;
 		//public event EventHandler<MouseButtonEventArgs> MouseButtonUp;
 		//public event EventHandler<MouseButtonEventArgs> MouseButtonDown;
@@ -507,7 +512,10 @@ namespace Crow
 			return stream != null;
 		}
 
-		public static Stream GetStreamFromPath (string path)
+		public delegate Stream GetStreamFromPathDelegate (string path);
+		public static GetStreamFromPathDelegate GetStreamFromPath = _getStreamFromPath;
+
+		static Stream _getStreamFromPath (string path)
 		{
 			if (path.StartsWith ("#", StringComparison.Ordinal)) {
 				Stream stream = null;
@@ -618,8 +626,8 @@ namespace Crow
 
 				_activeWidget = value;
 
+				NotifyValueChanged ("ActiveWidget", _activeWidget);
 #if DEBUG_LOG
-				NotifyValueChanged("ActiveWidget", _activeWidget);
 				DbgLogger.AddEvent (DbgEvtType.ActiveWidget, _activeWidget);
 #endif
 
@@ -640,8 +648,8 @@ namespace Crow
 
 				_hoverWidget = value;
 
+				NotifyValueChanged ("HoverWidget", _hoverWidget);
 #if DEBUG_LOG
-				NotifyValueChanged("HoverWidget", _hoverWidget);
 				DbgLogger.AddEvent (DbgEvtType.HoverWidget, _hoverWidget);
 #endif
 
@@ -669,8 +677,9 @@ namespace Crow
 				if (_focusedWidget != null)
 					_focusedWidget.HasFocus = false;
 				_focusedWidget = value;
-#if DEBUG_LOG
-				NotifyValueChanged("FocusedWidget", _focusedWidget);
+
+				NotifyValueChanged ("FocusedWidget", _focusedWidget);
+#if DEBUG_LOG				
 				DbgLogger.AddEvent (DbgEvtType.FocusedWidget, _focusedWidget);
 #endif
 				if (_focusedWidget != null)
@@ -823,7 +832,7 @@ namespace Crow
 							DragImageY = MousePosition.Y - DragImageHeight / 2;
 							ctx.Save ();
 							ctx.ResetClip ();
-							ctx.SetSourceSurface (DragImage, DragImageX, DragImageY);
+							ctx.SetSource (DragImage, DragImageX, DragImageY);
 							ctx.PaintWithAlpha (0.8);
 							ctx.Restore ();
 							DirtyRect += new Rectangle (DragImageX, DragImageY, DragImageWidth, DragImageHeight);
@@ -972,11 +981,31 @@ namespace Crow
 		/// when window resize event occurs. 
 		/// </summary>
 		/// <param name="bounds">bounding box of the interface</param>
-		public virtual void ProcessResize(Rectangle bounds){
+		public virtual void ProcessResize(Rectangle bounds){			
 			lock (UpdateMutex) {
 				clientRectangle = bounds;
 
-				surf.SetSize (clientRectangle.Width, clientRectangle.Height);
+				switch (Environment.OSVersion.Platform) {
+				case PlatformID.MacOSX:
+					break;
+				case PlatformID.Unix:
+					surf.SetSize (clientRectangle.Width, clientRectangle.Height);
+					break;
+				case PlatformID.Win32NT:
+				case PlatformID.Win32S:
+				case PlatformID.Win32Windows:
+					if (ownWindow) {
+						surf.Dispose ();
+						IntPtr hWin32 = Glfw3.GetWin32Window (hWin);
+						IntPtr hdc = Glfw3.GetWin32DC (hWin32);
+						surf = new Win32Surface (hdc);
+					}else
+						surf.SetSize (clientRectangle.Width, clientRectangle.Height);
+					break;
+				case PlatformID.Xbox:
+				case PlatformID.WinCE:
+					throw new PlatformNotSupportedException ("Unable to create cairo surface.");
+				}
 
 				foreach (Widget g in GraphicTree)
 					g.RegisterForLayouting (LayoutingType.All);
@@ -1085,42 +1114,43 @@ namespace Crow
 				//MouseCursorChanged.Raise (this,new MouseCursorChangedEventArgs(cursor));
 			}
 		}
-
-		uint stickyMouse = 0;
-		Point stickyMousePos = default;
-		internal void SetStickyMouse (uint threshold = 5)
-		{
-			stickyMouse = threshold;
-			stickyMousePos = MousePosition;
-		}
+		
+		Point stickyMouseDelta = default;
+		internal Widget stickedWidget = null;
 
 		/// <summary>Processes mouse move events from the root container, this function
 		/// should be called by the host on mouse move event to forward events to crow interfaces</summary>
 		/// <returns>true if mouse is in the interface</returns>
 		public virtual bool OnMouseMove (int x, int y)
-		{
+		{			
+			int deltaX = x - MousePosition.X;
+			int deltaY = y - MousePosition.Y;
+
+			if (stickedWidget != null && _activeWidget == null) {
+				stickyMouseDelta.X += deltaX;
+				stickyMouseDelta.Y += deltaY;				
 
-			if (stickyMouse>0) {
-				if (Math.Abs(x - stickyMousePos.X) < stickyMouse && Math.Abs(y - stickyMousePos.Y) < stickyMouse)
+				if (Math.Abs (stickyMouseDelta.X) > stickedWidget.StickyMouse || Math.Abs (stickyMouseDelta.Y) > stickedWidget.StickyMouse) {
+					stickedWidget = null;
+					stickyMouseDelta = default;
+				} else {
+					Glfw3.SetCursorPosition (hWin, MousePosition.X, MousePosition.Y);
 					return true;
-				stickyMouse = 0;
+				}
 			}
-			int deltaX = x - MousePosition.X;
-			int deltaY = y - MousePosition.Y;
 
 			MousePosition = new Point (x, y);
 			MouseMoveEventArgs e = new MouseMoveEventArgs (x, y, deltaX, deltaY);
 
-			if (ActiveWidget != null && DragAndDropOperation == null) {
+			if (DragAndDropOperation != null)//drag source cant have hover event, so move has to be handle here
+				DragAndDropOperation.DragSource.onMouseMove (this, e);
+			else if (ActiveWidget != null) {
 				//TODO, ensure object is still in the graphic tree
 				//send move evt even if mouse move outside bounds
 				_activeWidget.onMouseMove (this, e);
 				return true;
 			}
 
-			if (DragAndDropOperation != null)//drag source cant have hover event, so move has to be handle here
-				DragAndDropOperation.DragSource.onMouseMove (this, e);
-
 			if (_hoverWidget != null) {
 				resetTooltip ();
 				//check topmost graphicobject first
@@ -1177,8 +1207,11 @@ namespace Crow
 					Widget g = GraphicTree [i];
 					if (g.MouseIsIn (e.Position)) {
 						g.checkHoverWidget (e);
-						if (g is Window)
-							PutOnTop (g);
+						if (g is Window && FOCUS_ON_HOVER && g.Focusable) {
+							FocusedWidget = g;
+							if (RAISE_WIN_ON_FOCUS)
+								PutOnTop (g);
+						}
 						_hoverWidget.onMouseMove (_hoverWidget, e);
 						return true;
 					}
diff --git a/Crow/src/ItemTemplate.cs b/Crow/src/ItemTemplate.cs
index 01e76b59..11fea671 100644
--- a/Crow/src/ItemTemplate.cs
+++ b/Crow/src/ItemTemplate.cs
@@ -251,5 +251,25 @@ namespace Crow
                 il.Emit (OpCodes.Callvirt, miGetDatas);
         }
 	}
+
+	public static partial class Extensions
+	{
+		public static string GetIcon (this Widget go) {
+			return "#Icons." + go.GetType ().FullName + ".svg";
+		}
+		public static List<Widget> GetChildren (this Widget go) {
+			Type goType = go.GetType ();
+			if (typeof (Group).IsAssignableFrom (goType))
+				return (go as Group).Children;
+			if (typeof (Container).IsAssignableFrom (goType))
+				return new List<Widget> (new Widget[] { (go as Container).Child });
+			if (typeof (TemplatedContainer).IsAssignableFrom (goType))
+				return new List<Widget> (new Widget[] { (go as TemplatedContainer).Content });
+			if (typeof (TemplatedGroup).IsAssignableFrom (goType))
+				return (go as TemplatedGroup).Items;
+
+			return new List<Widget> ();
+		}
+	}
 }
 
diff --git a/Crow/src/Mono.Cairo/Context.cs b/Crow/src/Mono.Cairo/Context.cs
index 7ed5e62c..1ce4cd0f 100644
--- a/Crow/src/Mono.Cairo/Context.cs
+++ b/Crow/src/Mono.Cairo/Context.cs
@@ -340,7 +340,7 @@ namespace Crow.Cairo {
 		}
 
 		//[Obsolete ("Use SetSource method (with double parameters)")]
-		public void SetSourceSurface (Surface source, int x, int y)
+		public void SetSource (Surface source, int x = 0, int y = 0)
 		{
 			NativeMethods.cairo_set_source_surface (handle, source.Handle, x, y);
 		}
@@ -861,7 +861,7 @@ namespace Crow.Cairo {
 
 		public void ShowText(string str)
 		{
-			NativeMethods.cairo_show_text (handle, str);
+			NativeMethods.cairo_show_text (handle, TerminateUtf8 (str));
 		}
 
 
diff --git a/Crow/src/Mono.Cairo/NativeMethods.cs b/Crow/src/Mono.Cairo/NativeMethods.cs
index 1b423209..66b528a1 100644
--- a/Crow/src/Mono.Cairo/NativeMethods.cs
+++ b/Crow/src/Mono.Cairo/NativeMethods.cs
@@ -752,7 +752,7 @@ namespace Crow.Cairo
 		internal static extern void cairo_show_page (IntPtr cr);
 
 		[DllImport (cairo, CallingConvention=CallingConvention.Cdecl)]
-		internal static extern void cairo_show_text (IntPtr cr, string text);
+		internal static extern void cairo_show_text (IntPtr cr, byte[] text);
 
 		[DllImport (cairo, CallingConvention=CallingConvention.Cdecl)]
 		internal static extern Status cairo_status (IntPtr cr);
diff --git a/Crow/src/Widgets/DockStack.cs b/Crow/src/Widgets/DockStack.cs
index 81aa5e74..da9110e4 100644
--- a/Crow/src/Widgets/DockStack.cs
+++ b/Crow/src/Widgets/DockStack.cs
@@ -71,6 +71,7 @@ namespace Crow
 
 		Rectangle rIn = default(Rectangle);
 		double dockThresh = 0.2;
+		const int dockWidthDivisor = 8;
 		Widget focusedChild;
 		internal Widget stretchedChild;
 
@@ -113,33 +114,33 @@ namespace Crow
 					rIn = cb;
 
 					if (Orientation == Orientation.Horizontal || Children.Count == 1) {
-						if (lm.Y > cb.Top + cb.Height / 3 && lm.Y < cb.Bottom - cb.Height / 3) {
-							if (lm.X < cb.Left + cb.Width / 3)
+						if (lm.Y > cb.Top + cb.Height / dockWidthDivisor && lm.Y < cb.Bottom - cb.Height / dockWidthDivisor) {
+							if (lm.X < cb.Left + cb.Width / dockWidthDivisor)
 								dw.DockingPosition = Alignment.Left;
-							else if (lm.X > cb.Right - cb.Width / 3)
+							else if (lm.X > cb.Right - cb.Width / dockWidthDivisor)
 								dw.DockingPosition = Alignment.Right;							
 						} else {
 							getFocusedChild (lm);
 							if (focusedChild != null) {
-								if (lm.Y < rIn.Top + rIn.Height / 3)
+								if (lm.Y < rIn.Top + rIn.Height / dockWidthDivisor)
 									dw.DockingPosition = Alignment.Top;
-								else if (lm.Y > rIn.Bottom - rIn.Height / 3)
+								else if (lm.Y > rIn.Bottom - rIn.Height / dockWidthDivisor)
 									dw.DockingPosition = Alignment.Bottom;										
 							}
 						}
 					}
 					if (Orientation == Orientation.Vertical || Children.Count == 1) {
-						if (lm.X > cb.Left + cb.Width / 3 && lm.X < cb.Right - cb.Width / 3) {
-							if (lm.Y < cb.Top + cb.Height / 3)
+						if (lm.X > cb.Left + cb.Width / dockWidthDivisor && lm.X < cb.Right - cb.Width / dockWidthDivisor) {
+							if (lm.Y < cb.Top + cb.Height / dockWidthDivisor)
 								dw.DockingPosition = Alignment.Top;
-							else if (lm.Y > cb.Bottom - cb.Height / 3)
+							else if (lm.Y > cb.Bottom - cb.Height / dockWidthDivisor)
 								dw.DockingPosition = Alignment.Bottom;							
 						} else {
 							getFocusedChild (lm);
 							if (focusedChild != null) {
-								if (lm.X < rIn.Left + rIn.Width / 3)
+								if (lm.X < rIn.Left + rIn.Width / dockWidthDivisor)
 									dw.DockingPosition = Alignment.Left;
-								else if (lm.X > rIn.Right - rIn.Width / 3)
+								else if (lm.X > rIn.Right - rIn.Width / dockWidthDivisor)
 									dw.DockingPosition = Alignment.Right;										
 							}
 						}
diff --git a/Crow/src/Widgets/DockWindow.cs b/Crow/src/Widgets/DockWindow.cs
index e9c37179..bf59b155 100644
--- a/Crow/src/Widgets/DockWindow.cs
+++ b/Crow/src/Widgets/DockWindow.cs
@@ -68,15 +68,18 @@ namespace Crow
 
 		public override void onMouseMove (object sender, MouseMoveEventArgs e)
 		{
-//			if (this.HasFocus && e.Mouse.IsButtonDown (MouseButton.Left) && IsDocked) {
-//				if (Math.Abs (e.Position.X - undockingMousePosOrig.X) > 10 ||
-//				    Math.Abs (e.Position.X - undockingMousePosOrig.X) > 10)
-//					Undock ();
-//			}
-
-			if (this.HasFocus && IFace.IsDown(MouseButton.Left) && IsDocked)
-				CheckUndock (e.Position);
+			//			if (this.HasFocus && e.Mouse.IsButtonDown (MouseButton.Left) && IsDocked) {
+			//				if (Math.Abs (e.Position.X - undockingMousePosOrig.X) > 10 ||
+			//				    Math.Abs (e.Position.X - undockingMousePosOrig.X) > 10)
+			//					Undock ();
+			//			}
+			if (IFace.IsDown (MouseButton.Left) && IFace.DragAndDropOperation?.DragSource == this) {
+				if (isDocked)
+					CheckUndock (e.Position);
+				else
+					moveAndResize (e.XDelta, e.YDelta, currentDirection);
 
+			}
 			base.onMouseMove (sender, e);
 		}
 		public override void onMouseDown (object sender, MouseButtonEventArgs e)
@@ -100,7 +103,8 @@ namespace Crow
 
 		protected override void onStartDrag (object sender, DragDropEventArgs e)
 		{
-			base.onStartDrag (sender, e);
+			if (currentDirection == Direction.None)
+				base.onStartDrag (sender, e);
 
 			undockingMousePosOrig = IFace.MousePosition;
 		}
diff --git a/Crow/src/Widgets/Group.cs b/Crow/src/Widgets/Group.cs
index df452bee..5f0a7b21 100644
--- a/Crow/src/Widgets/Group.cs
+++ b/Crow/src/Widgets/Group.cs
@@ -350,7 +350,7 @@ namespace Crow
 			}
 			gr.Dispose ();
 
-			ctx.SetSourceSurface (bmp, rb.X, rb.Y);
+			ctx.SetSource (bmp, rb.X, rb.Y);
 			ctx.Paint ();
 
 			Clipping.Dispose();
diff --git a/Crow/src/Widgets/PrivateContainer.cs b/Crow/src/Widgets/PrivateContainer.cs
index 415d45d2..ebca78e8 100644
--- a/Crow/src/Widgets/PrivateContainer.cs
+++ b/Crow/src/Widgets/PrivateContainer.cs
@@ -216,7 +216,7 @@ namespace Crow
 				
 			gr.Dispose ();
 
-			ctx.SetSourceSurface (bmp, rb.X, rb.Y);
+			ctx.SetSource (bmp, rb.X, rb.Y);
 			ctx.Paint ();
 			Clipping.Dispose();
 			Clipping = new Region ();
diff --git a/Crow/src/Widgets/TabItem.cs b/Crow/src/Widgets/TabItem.cs
index 25c89ae3..19fcb94e 100644
--- a/Crow/src/Widgets/TabItem.cs
+++ b/Crow/src/Widgets/TabItem.cs
@@ -189,9 +189,9 @@ namespace Crow
 						this.onDraw (ctx);
 					else {
 						if (LastPaintedSlot.Width>LastPaintedSlot.Height)
-							ctx.SetSourceSurface (bmp, 0, (LastPaintedSlot.Width-LastPaintedSlot.Height)/2);
+							ctx.SetSource (bmp, 0, (LastPaintedSlot.Width-LastPaintedSlot.Height)/2);
 						else
-							ctx.SetSourceSurface (bmp, (LastPaintedSlot.Height-LastPaintedSlot.Width)/2, 0);
+							ctx.SetSource (bmp, (LastPaintedSlot.Height-LastPaintedSlot.Width)/2, 0);
 
 						ctx.Paint ();
 					}
diff --git a/Crow/src/Widgets/Widget.cs b/Crow/src/Widgets/Widget.cs
index c060f954..d75c63c4 100644
--- a/Crow/src/Widgets/Widget.cs
+++ b/Crow/src/Widgets/Widget.cs
@@ -121,9 +121,9 @@ namespace Crow
 					this.onDraw (ctx);
 				else {
 					if (LastPaintedSlot.Width>LastPaintedSlot.Height)
-						ctx.SetSourceSurface (bmp, 0, (LastPaintedSlot.Width-LastPaintedSlot.Height)/2);
+						ctx.SetSource (bmp, 0, (LastPaintedSlot.Width-LastPaintedSlot.Height)/2);
 					else
-						ctx.SetSourceSurface (bmp, (LastPaintedSlot.Height-LastPaintedSlot.Width)/2, 0);
+						ctx.SetSource (bmp, (LastPaintedSlot.Height-LastPaintedSlot.Width)/2, 0);
 					ctx.Paint ();
 				}
 			}
@@ -278,6 +278,8 @@ namespace Crow
 		bool isActive;
 		bool isHover;
 		bool mouseRepeat;
+		bool stickyMouseEnabled;
+		int stickyMouse;
 		MouseCursor mouseCursor = MouseCursor.top_left_arrow;
 		protected bool isVisible = true;
 		bool isEnabled = true;
@@ -449,11 +451,11 @@ namespace Crow
 		public event EventHandler Focused;
 		/// <summary>Occurs when this object loose focus</summary>
 		public event EventHandler Unfocused;
-		/// <summary>Occurs when mouse is over</summary>
+		/// <summary>Occurs when this widget is hovered by the mouse</summary>
 		public event EventHandler Hover;
-		/// <summary>Occurs when this control is no longer the Hover one</summary>
-		//public event EventHandler UnHover;
-		/// <summary>Occurs when this object loose focus</summary>
+		/// <summary>Occurs when this widget is no longuer the hover one</summary>
+		public event EventHandler Unhover;
+		/// <summary>Occurs when this widget is enabled</summary>
 		public event EventHandler Enabled;
 		/// <summary>Occurs when the enabled state this object is set to false</summary>
 		public event EventHandler Disabled;
@@ -737,10 +739,16 @@ namespace Crow
 				if (value == isHover)
 					return;
 
+				if (isHover & !value)
+					Unhover.Raise (this, null);
+
 				isHover = value;
 
-				if (isHover)
+				if (isHover) {
+					if (stickyMouseEnabled && stickyMouse > 0) 
+						IFace.stickedWidget = this;											
 					Hover.Raise (this, null);
+				}
 
 				NotifyValueChangedAuto (isHover);
 			}
@@ -758,6 +766,32 @@ namespace Crow
 				NotifyValueChangedAuto (mouseRepeat);
 			}
 		}
+		/// <summary>
+		/// When StickyMouse value is greater than zero and StickyMouseEnabled is true, mouse will be sticked over the widget
+		/// until x or y delta is greater than the StickyMouse value. This is usefulle for very thin (1 pixel) border that need to
+		/// be grabbed with the mouse.
+		/// </summary>
+		public virtual int StickyMouse {
+			get => stickyMouse;
+			set {
+				if (stickyMouse == value)
+					return;
+				stickyMouse = value;
+				NotifyValueChangedAuto (stickyMouse);
+            }
+        }
+		/// <summary>
+		/// Boolean for enabling or not the sticky mouse mechanic
+		/// </summary>
+		public virtual bool StickyMouseEnabled {
+			get => stickyMouseEnabled;
+			set {
+				if (stickyMouseEnabled == value)
+					return;
+				stickyMouseEnabled = value;
+				NotifyValueChangedAuto (stickyMouseEnabled);
+            }
+        }
 		/// <summary>
 		/// Determine Cursor when mouse is Hover.
 		/// </summary>
@@ -1347,8 +1381,9 @@ namespace Crow
 		/// </summary>
 		protected virtual void onStartDrag (object sender, DragDropEventArgs e){
 			IFace.HoverWidget = null;
+			IFace.DragAndDropOperation = new DragDropEventArgs (this);
 			IsDragged = true;
-			StartDrag.Raise (this, e);
+			StartDrag.Raise (this, IFace.DragAndDropOperation);
 			#if DEBUG_DRAGNDROP
 			Debug.WriteLine(this.ToString() + " : START DRAG => " + e.ToString());
 			#endif
@@ -1807,7 +1842,7 @@ namespace Crow
 				ctx.Operator = Operator.Over;
 			}
 
-			ctx.SetSourceSurface (bmp, rb.X, rb.Y);
+			ctx.SetSource (bmp, rb.X, rb.Y);
 			ctx.Paint ();
 			Clipping.Dispose ();
 			Clipping = new Region ();
@@ -1935,10 +1970,8 @@ namespace Crow
 		public virtual void onMouseMove (object sender, MouseMoveEventArgs e)
 		{
 			if (allowDrag & hasFocus & IFace.IsDown(MouseButton.Left)) {
-				if (IFace.DragAndDropOperation == null) {
-					IFace.DragAndDropOperation = new DragDropEventArgs (this);
-					onStartDrag (this, IFace.DragAndDropOperation);
-				}
+				if (IFace.DragAndDropOperation == null)		
+					onStartDrag (this, IFace.DragAndDropOperation);				
 			}
 
 			//dont bubble event if dragged, mouse move is routed directely from iface
@@ -2005,7 +2038,7 @@ namespace Crow
 		}
 		public virtual void onMouseEnter(object sender, MouseMoveEventArgs e)
 		{
-			IFace.MouseCursor = MouseCursor;
+			IFace.MouseCursor = MouseCursor;			
 
 			if (IFace.DragAndDropOperation != null) {
 				Widget g = this;
@@ -2025,7 +2058,10 @@ namespace Crow
 			MouseEnter.Raise (this, e);
 		}
 		public virtual void onMouseLeave(object sender, MouseMoveEventArgs e)
-		{
+		{			
+			if (IFace.DragAndDropOperation?.DropTarget == this)
+				IFace.DragAndDropOperation.DropTarget.onDragLeave (this, IFace.DragAndDropOperation);
+			
 			MouseLeave.Raise (this, e);
 		}
 
diff --git a/Crow/src/Widgets/Window.cs b/Crow/src/Widgets/Window.cs
index accf198c..374b67d2 100644
--- a/Crow/src/Widgets/Window.cs
+++ b/Crow/src/Widgets/Window.cs
@@ -33,7 +33,7 @@ namespace Crow
 		Rectangle savedBounds;
 		bool _minimized = false;
 
-		Direction currentDirection = Direction.None;
+		protected Direction currentDirection = Direction.None;
 
 		#region Events
 		public event EventHandler Closing;
@@ -63,13 +63,19 @@ namespace Crow
 			sizingHandle = child?.FindByName ("SizeHandle");
 
 			if (sizingHandle == null)
-				return;
-			sizingHandle.MouseEnter += (arg1, arg2) => IFace.SetStickyMouse(5);
+				return;			
+            //sizingHandle.Unhover += (arg1, arg2) => currentDirection = Direction.None;
+            sizingHandle.Unhover += SizingHandle_Unhover;
 		}
-		#endregion
 
-		#region public properties
-		[DefaultValue("#Crow.Icons.crow.svg")]
+        private void SizingHandle_Unhover (object sender, EventArgs e) {
+			currentDirection = Direction.None;
+			NotifyValueChanged ("CurDir", currentDirection);
+		}
+        #endregion
+
+        #region public properties
+        [DefaultValue("#Crow.Icons.crow.svg")]
 		public string Icon {
 			get { return _icon; } 
 			set {
@@ -159,7 +165,7 @@ namespace Crow
 		/// <param name="XDelta">mouse delta on the X axis</param>
 		/// <param name="YDelta">mouse delta on the Y axis</param>
 		/// <param name="currentDirection">Current Direction of the operation, none for moving, other value for resizing in the given direction</param>
-		public void MoveAndResize (int XDelta, int YDelta, Direction currentDirection = (Direction)0) {
+		protected void moveAndResize (int XDelta, int YDelta, Direction currentDirection = (Direction)0) {
 			int currentLeft = this.Left;
 			int currentTop = this.Top;
 			int currentWidth, currentHeight;
@@ -238,11 +244,9 @@ namespace Crow
 		{
 			base.onMouseMove (sender, e);
 
-			Interface otkgw = IFace;
-
 			if (maySize || mayMove) {
 				if (grabMouse) {
-					MoveAndResize (e.XDelta, e.YDelta, currentDirection);
+					moveAndResize (e.XDelta, e.YDelta, currentDirection);
 					return;
 				}
 			}else
@@ -276,50 +280,54 @@ namespace Crow
 
 			switch (currentDirection) {
 			case Direction.None:
-				otkgw.MouseCursor = MouseCursor.move;
+				IFace.MouseCursor = MouseCursor.move;
 				break;
 			case Direction.N:
-				otkgw.MouseCursor = MouseCursor.top_side;
+				IFace.MouseCursor = MouseCursor.top_side;
 				break;
 			case Direction.S:
-				otkgw.MouseCursor = MouseCursor.bottom_side;
+				IFace.MouseCursor = MouseCursor.bottom_side;
 				break;
 			case Direction.E:
-				otkgw.MouseCursor = MouseCursor.right_side;
+				IFace.MouseCursor = MouseCursor.right_side;
 				break;
 			case Direction.W:
-				otkgw.MouseCursor = MouseCursor.left_side;
+				IFace.MouseCursor = MouseCursor.left_side;
 				break;
 			case Direction.NW:
-				otkgw.MouseCursor = MouseCursor.top_left_corner;
+				IFace.MouseCursor = MouseCursor.top_left_corner;
 				break;
 			case Direction.NE:
-				otkgw.MouseCursor = MouseCursor.top_right_corner;
+				IFace.MouseCursor = MouseCursor.top_right_corner;
 				break;
 			case Direction.SW:
-				otkgw.MouseCursor = MouseCursor.bottom_left_corner;
+				IFace.MouseCursor = MouseCursor.bottom_left_corner;
 				break;
 			case Direction.SE:
-				otkgw.MouseCursor = MouseCursor.bottom_right_corner;
+				IFace.MouseCursor = MouseCursor.bottom_right_corner;
 				break;
 			}
-							
+			NotifyValueChanged ("CurDir", currentDirection);
 		}
 		public override void onMouseLeave (object sender, MouseMoveEventArgs e)
 		{
 			base.onMouseLeave (sender, e);
 			currentDirection = Direction.None;
 			IFace.MouseCursor = MouseCursor.top_left_arrow;
+			NotifyValueChanged ("CurDir", currentDirection);
 		}
 		bool grabMouse;
 		public override void onMouseDown (object sender, MouseButtonEventArgs e)
 		{
+			NotifyValueChanged ("GrabMouse", true);
 			grabMouse = true;
 			e.Handled = true;
 			base.onMouseDown (sender, e);
 		}
 		public override void onMouseUp (object sender, MouseButtonEventArgs e)
 		{
+			NotifyValueChanged ("GrabMouse", false);
+			NotifyValueChanged ("CurDir", currentDirection);
 			grabMouse = false;
 			e.Handled = true;
 			base.onMouseUp (sender, e);
diff --git a/Samples/Directory.Build.props b/Samples/Directory.Build.props
index 120aa913..190db9dc 100644
--- a/Samples/Directory.Build.props
+++ b/Samples/Directory.Build.props
@@ -1,6 +1,6 @@
 <Project>
 	<PropertyGroup>
-		<TargetFrameworks>net472;netcoreapp3.1</TargetFrameworks>
+		<TargetFrameworks>netcoreapp3.1</TargetFrameworks>
 		<OutputType>Exe</OutputType>
 		
 		<SolutionDir>$(MSBuildThisFileDirectory)..\</SolutionDir>
diff --git a/Samples/ShowCase/ShowCase.cs b/Samples/ShowCase/ShowCase.cs
index d8254317..8af2c002 100644
--- a/Samples/ShowCase/ShowCase.cs
+++ b/Samples/ShowCase/ShowCase.cs
@@ -16,6 +16,7 @@ namespace ShowCase
 	{
 		static void Main ()
 		{
+			Environment.SetEnvironmentVariable ("FONTCONFIG_PATH", @"C:\Users\Jean-Philippe\source\vcpkg\installed\x64-windows\tools\fontconfig\fonts");
 			using (Showcase app = new Showcase ()) 
 				app.Run ();
 		}
@@ -47,6 +48,7 @@ namespace ShowCase
 			set {
 				if (source == value)
 					return;
+
 				source = value;
 				reloadFromSource ();
 				CMDSave.CanExecute = source != origSource;
@@ -82,7 +84,7 @@ namespace ShowCase
 		}
 
 		public new bool IsDirty {
-			get => origSource != source;
+			get => !string.Equals(origSource, source);
 		}
 		void onSave ()
 		{
diff --git a/Samples/common/samples.style b/Samples/common/samples.style
index 124cfcf4..50f91f4a 100644
--- a/Samples/common/samples.style
+++ b/Samples/common/samples.style
@@ -66,4 +66,7 @@ valignStyle2 {
 	Unchecked = "{Background=Black}";
 	//Initialized="GetDrawModeIcon";
 	//Initialized="{Background=Blue}";
+}
+smallLabel {
+	Font="consolas, 8";
 }
\ No newline at end of file
diff --git a/Samples/common/ui/Interfaces/Divers/2.crow b/Samples/common/ui/Interfaces/Divers/2.crow
index b4a06b68..d2c8c370 100644
--- a/Samples/common/ui/Interfaces/Divers/2.crow
+++ b/Samples/common/ui/Interfaces/Divers/2.crow
@@ -2,12 +2,13 @@
 <VerticalStack Fit="true">
 	<TextBox Font="droid, 20" Text="test text box" Width="Stretched"/>
 	<HorizontalStack Margin="5" Fit="true" MouseEnter="{Background=White}" MouseLeave="{Background=Transparent}">
+		<Label Text="left" Width="80" Height="30" Background="DarkBlue" TextAlignment="Left"/>
 		<Label Text="centered" Width="80" Height="30" Background="DarkBlue" TextAlignment="Center"/>
 		<Label Text="top left" Width="80" Height="30" Background="DarkBlue" TextAlignment="TopLeft"/>
 		<Label Text="top right" Width="80" Height="30" Background="DarkBlue" TextAlignment="TopRight"/>
-		<Label Text="right center" Width="80" Height="30" Background="DarkBlue" TextAlignment="Right"/>
+		<Label Text="right" Width="80" Height="30" Background="DarkBlue" TextAlignment="Right"/>
 		<Label Text="bottom left" Width="80" Height="30" Background="DarkBlue" TextAlignment="BottomLeft"/>
-		<Label Text="bottom center" Width="80" Height="30" Background="DarkBlue" TextAlignment="Bottom"/>
+		<Label Text="bottom" Width="80" Height="30" Background="DarkBlue" TextAlignment="Bottom"/>
 		<Label Text="bottom right" Width="80" Height="30" Background="DarkBlue" TextAlignment="BottomRight"/>
 	</HorizontalStack>
 </VerticalStack>
\ No newline at end of file
diff --git a/Samples/common/ui/Interfaces/Experimental/testDock.crow b/Samples/common/ui/Interfaces/Experimental/testDock.crow
index b69f8e78..14659f88 100644
--- a/Samples/common/ui/Interfaces/Experimental/testDock.crow
+++ b/Samples/common/ui/Interfaces/Experimental/testDock.crow
@@ -1,8 +1,8 @@
 <?xml version="1.0"?>
-<Window Width="Stretched" Height="Stretched" Background="Jet">
-	<DockStack Name="mainDock" Background="DarkRed" Margin="20">
-	</DockStack>
-</Window>
+<DockStack Name="mainDock" Background="Jet" Margin="0">
+	<DockWindow Resizable = "true" Top="100" Left="100" Caption="View 1" Width="300" Height="300"/>
+</DockStack>
+
 <!---		
 		<DockWindow Left="450" Top="450" Width="150" Height="150" Background="Yellow"/>-->
 	
@@ -14,7 +14,7 @@
 	<Window Top="400" Left="400" Focusable="true" Caption="View 4" Resizable = "true" Width="300" Height="300"><Widget Focusable="true" Background="Black" MouseEnter="{Background=Grey}" MouseLeave="{Background=Black}"/></Window>
 </Group>-->
 <!--<Docker >
-	<DockWindow Resizable = "true" Top="100" Left="100" Caption="View 1" Width="300" Height="300">
+	
 		<VerticalStack Background="DarkGreen" Focusable="true">
 			<Label Text="{../../Left}" Background="Black" Width="Stretched"/>
 			<Label Text="{../../Top}" Background="Black"/>
diff --git a/Samples/common/ui/Interfaces/Experimental/testStack.crow b/Samples/common/ui/Interfaces/Experimental/testStack.crow
index 0348f0b5..97bbe62b 100644
--- a/Samples/common/ui/Interfaces/Experimental/testStack.crow
+++ b/Samples/common/ui/Interfaces/Experimental/testStack.crow
@@ -6,7 +6,7 @@
 	<HorizontalStack>
 		<Widget Height="Stretched" Width="100" Background="Red"/>
 		<Splitter/>
-		<Widget Height="Stretched" Width="100" Background="DarkRed"/>
+		<Widget Height="Stretched" Width="Stretched" Background="DarkRed"/>
 	</HorizontalStack>
 	<Splitter/>
 	<Widget Height="100" Width="500" Background="Green"/>
diff --git a/Samples/dockableWindows/dockableWindows.cs b/Samples/dockableWindows/dockableWindows.cs
new file mode 100644
index 00000000..65223acc
--- /dev/null
+++ b/Samples/dockableWindows/dockableWindows.cs
@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using Crow;
+using Glfw;
+
+namespace tests
+{
+	public class BasicTests : SampleBase
+	{
+		static void Main ()
+		{
+			using (BasicTests app = new BasicTests ()) {
+				app.Run ();
+			}
+		}
+
+		protected override void OnInitialized () {
+			Load ("#ui.test.crow").DataSource = this;
+			AddWidget (new DockWindow (this) { Background = Colors.Blue, Left = 10, Top = 110, Resizable = true });
+			AddWidget (new DockWindow (this) { Background = Colors.Red, Left = 30, Top = 130, Resizable = true });
+			AddWidget (new DockWindow (this) { Background = Colors.Green, Left = 50, Top = 150, Resizable = true });
+			AddWidget (new DockWindow (this) { Background = Colors.Yellow, Left = 70, Top = 170, Resizable = true });
+			AddWidget (new DockWindow (this) { Background = Colors.Grey, Left = 90, Top = 190, Resizable = true });
+		}
+		private void refreshGraphicTree (object sender, MouseButtonEventArgs e) {
+			NotifyValueChanged ("GraphicTree", (object)null);
+			NotifyValueChanged ("GraphicTree", GraphicTree);
+		}
+
+	}
+}
diff --git a/Samples/dockableWindows/dockableWindows.csproj b/Samples/dockableWindows/dockableWindows.csproj
new file mode 100644
index 00000000..3c9729fe
--- /dev/null
+++ b/Samples/dockableWindows/dockableWindows.csproj
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project Sdk="Microsoft.NET.Sdk">
+	<ItemGroup>		
+		<EmbeddedResource Include="ui\*.*">
+			<LogicalName>ui.%(Filename)%(Extension)</LogicalName>
+		</EmbeddedResource>
+	</ItemGroup>
+	<ItemGroup>
+	  <EmbeddedResource Update="ui\GTreeExp.itemp">
+	    <LogicalName>ui.%(Filename)%(Extension)</LogicalName>
+	  </EmbeddedResource>
+	</ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/Samples/dockableWindows/ui/GTreeExp.itemp b/Samples/dockableWindows/ui/GTreeExp.itemp
new file mode 100644
index 00000000..f2a7c2ba
--- /dev/null
+++ b/Samples/dockableWindows/ui/GTreeExp.itemp
@@ -0,0 +1,32 @@
+<?xml version="1.0"?>
+<Expandable IsExpanded="{²IsExpanded}" MouseDoubleClick="/onClickForExpand">
+	<Template>
+		<VerticalStack>
+			<Border CornerRadius="2" Margin="0" Height="Fit"						
+					Foreground="Transparent"
+					MouseEnter="{Foreground=DimGrey}"
+					MouseLeave="{Foreground=Transparent}">
+				<HorizontalStack Spacing="1">
+					<Image Margin="1" Width="9" Height="9" Focusable="true" MouseDown="./onClickForExpand"
+						Path="{./Image}"
+						Visible="{./IsExpandable}"
+						SvgSub="{./IsExpanded}"
+						MouseEnter="{Background=LightGrey}"
+						MouseLeave="{Background=Transparent}"/>
+					<Border Width="16" Height="16" Foreground="Black" Background="DimGrey">
+						<Image Margin="2" Path="{GetIcon}" />
+					</Border>
+					<Widget Width="5" Height="5" Background="Blue" Visible="{IsHover}"/>
+					<Widget Width="5" Height="5" Background="Green" Visible="{Visible}"/>
+					<Label Text="{Name}" Width="Fit"/>
+					<Label Text="{LogicalParent}" Width="Stretched" Foreground="Yellow"/>
+				</HorizontalStack>
+			</Border>
+			<Container Name="Content" Visible="false"/>
+		</VerticalStack>
+	</Template>
+	<HorizontalStack Height="Fit">
+		<Widget Width="8" Height="10"/>
+		<VerticalStack Height="Fit" Name="ItemsContainer"/>
+	</HorizontalStack>
+</Expandable>
diff --git a/Samples/dockableWindows/ui/test.crow b/Samples/dockableWindows/ui/test.crow
new file mode 100644
index 00000000..3c16376b
--- /dev/null
+++ b/Samples/dockableWindows/ui/test.crow
@@ -0,0 +1,44 @@
+<?xml version="1.0"?>
+<VerticalStack>
+	<VerticalStack Name="Watches" Background="Black" Height="Fit" Width="Stretched">
+		<HorizontalStack Height="Fit">
+			<Label Style="smallLabel" Text="hover:" Width="50"/>
+			<Label Style="smallLabel" Text="{HoverWidget}"/>
+		</HorizontalStack>
+		<HorizontalStack Height="Fit">
+			<Label Style="smallLabel" Text="focus:" Width="50"/>
+			<Label Style="smallLabel" Text="{FocusedWidget}"/>
+		</HorizontalStack>
+		<HorizontalStack Height="Fit">
+			<Label Style="smallLabel" Text="active:" Width="50"/>
+			<Label Style="smallLabel" Text="{ActiveWidget}"/>
+		</HorizontalStack>
+	</VerticalStack>
+	<DockStack Height="70%"/>
+	<Splitter/>
+	<Button Caption="Refresh tree" MouseClick="refreshGraphicTree"/>
+	<TreeView IsRoot="true" Name="treeView" Data="{GraphicTree}">
+		<ItemTemplate>
+			<Border Width="Stretched" Focusable="true" Foreground="Transparent">
+				<HorizontalStack Spacing="5">
+					<Widget Width="5" Height="5"/>
+					<Border Width="16" Height="16" Foreground="Black" Background="DimGrey">
+						<Image Margin="2" Path="{GetIcon}" />
+					</Border>
+					<Widget Width="2" Height="5" Background="Blue" Visible="{IsHover}"/>
+					<Widget Width="5" Height="5" Background="Green" Visible="{Visible}"/>
+					<Label Text="{Name}" Width="Fit"/>
+					<Label Text="{LogicalParent}" Width="Stretched" Foreground="Yellow"/>
+				</HorizontalStack>
+			</Border>
+		</ItemTemplate>
+		<ItemTemplate DataType="Crow.Group" Data="GetChildren"
+			Path="#ui.GTreeExp.itemp"/>
+		<ItemTemplate DataType="Crow.Container" Data="GetChildren"
+			Path="#ui.GTreeExp.itemp"/>
+		<ItemTemplate DataType="Crow.TemplatedContainer" Data="GetChildren"
+			Path="#ui.GTreeExp.itemp"/>
+		<ItemTemplate DataType="Crow.TemplatedGroup" Data="GetChildren"
+			Path="#ui.GTreeExp.itemp"/>
+	</TreeView>	
+</VerticalStack>
diff --git a/Samples/dragNdrop/dragNdrop.cs b/Samples/dragNdrop/dragNdrop.cs
new file mode 100644
index 00000000..0c985747
--- /dev/null
+++ b/Samples/dragNdrop/dragNdrop.cs
@@ -0,0 +1,65 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using Crow;
+using Glfw;
+
+namespace tests
+{
+	public class BasicTests : SampleBase
+	{
+		static void Main ()
+		{
+			using (BasicTests app = new BasicTests ()) {
+				app.Run ();
+			}
+		}
+
+		protected override void OnInitialized ()
+		{
+			Load ("#ui.test.crow").DataSource = this;
+		}
+
+        private void refreshGraphicTree (object sender, MouseButtonEventArgs e) {
+            NotifyValueChanged ("GraphicTree", (object)null);
+            NotifyValueChanged ("GraphicTree", GraphicTree);
+        }
+
+        Group startGroup = null;
+        
+
+        private void W_StartDrag (object sender, DragDropEventArgs e) {
+            startGroup = e.DragSource.Parent as Group;
+            DragImageHeight = e.DragSource.LastPaintedSlot.Height;
+            DragImageWidth = e.DragSource.LastPaintedSlot.Width;
+
+            Crow.Cairo.Surface dragImg = surf.CreateSimilar (Crow.Cairo.Content.ColorAlpha, DragImageWidth, DragImageHeight);
+            using (Crow.Cairo.Context gr = new Crow.Cairo.Context(dragImg)) {
+                gr.SetSource (e.DragSource.bmp, 0, 0);
+                gr.Paint ();
+            }
+            DragImage = dragImg;
+            lock (UpdateMutex)
+                startGroup.RemoveChild (e.DragSource);
+        }
+        private void W_EndDrag (object sender, DragDropEventArgs e) {
+            lock (UpdateMutex)
+                startGroup.AddChild (e.DragSource);            
+        }
+
+        private void W_DragEnter (object sender, DragDropEventArgs e) {
+            lock (UpdateMutex)
+                (e.DropTarget as Group).AddChild (e.DragSource);
+        }
+        private void W_DragLeave (object sender, DragDropEventArgs e) {
+            lock (UpdateMutex)
+                (e.DragSource.Parent as Group).RemoveChild (e.DragSource);
+        }
+        private void W_Drop (object sender, DragDropEventArgs e) {
+            //(e.DropTarget as Group).AddChild (e.DragSource);            
+        }
+
+
+    }
+}
diff --git a/Samples/dragNdrop/dragNdrop.csproj b/Samples/dragNdrop/dragNdrop.csproj
new file mode 100644
index 00000000..9961c6b9
--- /dev/null
+++ b/Samples/dragNdrop/dragNdrop.csproj
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project Sdk="Microsoft.NET.Sdk">
+	<ItemGroup>
+		<EmbeddedResource Include="ui\*.*">
+			<LogicalName>ui.%(Filename)%(Extension)</LogicalName>
+		</EmbeddedResource>
+	</ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/Samples/dragNdrop/ui/GTreeExp.itemp b/Samples/dragNdrop/ui/GTreeExp.itemp
new file mode 100644
index 00000000..f2a7c2ba
--- /dev/null
+++ b/Samples/dragNdrop/ui/GTreeExp.itemp
@@ -0,0 +1,32 @@
+<?xml version="1.0"?>
+<Expandable IsExpanded="{²IsExpanded}" MouseDoubleClick="/onClickForExpand">
+	<Template>
+		<VerticalStack>
+			<Border CornerRadius="2" Margin="0" Height="Fit"						
+					Foreground="Transparent"
+					MouseEnter="{Foreground=DimGrey}"
+					MouseLeave="{Foreground=Transparent}">
+				<HorizontalStack Spacing="1">
+					<Image Margin="1" Width="9" Height="9" Focusable="true" MouseDown="./onClickForExpand"
+						Path="{./Image}"
+						Visible="{./IsExpandable}"
+						SvgSub="{./IsExpanded}"
+						MouseEnter="{Background=LightGrey}"
+						MouseLeave="{Background=Transparent}"/>
+					<Border Width="16" Height="16" Foreground="Black" Background="DimGrey">
+						<Image Margin="2" Path="{GetIcon}" />
+					</Border>
+					<Widget Width="5" Height="5" Background="Blue" Visible="{IsHover}"/>
+					<Widget Width="5" Height="5" Background="Green" Visible="{Visible}"/>
+					<Label Text="{Name}" Width="Fit"/>
+					<Label Text="{LogicalParent}" Width="Stretched" Foreground="Yellow"/>
+				</HorizontalStack>
+			</Border>
+			<Container Name="Content" Visible="false"/>
+		</VerticalStack>
+	</Template>
+	<HorizontalStack Height="Fit">
+		<Widget Width="8" Height="10"/>
+		<VerticalStack Height="Fit" Name="ItemsContainer"/>
+	</HorizontalStack>
+</Expandable>
diff --git a/Samples/dragNdrop/ui/test.crow b/Samples/dragNdrop/ui/test.crow
new file mode 100644
index 00000000..ce49ea71
--- /dev/null
+++ b/Samples/dragNdrop/ui/test.crow
@@ -0,0 +1,55 @@
+<?xml version="1.0"?>
+<VerticalStack Background="Jet" Focusable="true">
+	<VerticalStack Name="Watches" Background="Black" Height="Fit" Width="Stretched">
+		<HorizontalStack Height="Fit">
+			<Label Style="smallLabel" Text="hover:" Width="50"/>
+			<Label Style="smallLabel" Text="{HoverWidget}"/>
+		</HorizontalStack>
+		<HorizontalStack Height="Fit">
+			<Label Style="smallLabel" Text="focus:" Width="50"/>
+			<Label Style="smallLabel" Text="{FocusedWidget}"/>
+		</HorizontalStack>
+		<HorizontalStack Height="Fit">
+			<Label Style="smallLabel" Text="active:" Width="50"/>
+			<Label Style="smallLabel" Text="{ActiveWidget}"/>
+		</HorizontalStack>
+	</VerticalStack>
+	<HorizontalStack Margin="20" Name="zone1" Height="100" Width="Stretched" Background="Grey" AllowDrop="true" DragEnter="W_DragEnter" DragLeave="W_DragLeave">
+		<Widget Name="w1" Background="Blue" Focusable="true" Width="50" Height="Stretched" AllowDrag="true" StartDrag="W_StartDrag" EndDrag="W_EndDrag" Drop="W_Drop"/>
+		<Widget Name="w2" Background="Red" Focusable="true" Width="50" Height="Stretched" AllowDrag="true" StartDrag="W_StartDrag" EndDrag="W_EndDrag" Drop="W_Drop"/>/>
+		<Widget Name="w3" Background="Green" Focusable="true" Width="50" Height="Stretched" AllowDrag="true" StartDrag="W_StartDrag" EndDrag="W_EndDrag" Drop="W_Drop"/>/>
+		<Widget Name="w4" Background="Yellow" Focusable="true" Width="50" Height="Stretched" AllowDrag="true" StartDrag="W_StartDrag" EndDrag="W_EndDrag" Drop="W_Drop"/>/>
+		<Widget Name="w5" Background="DimGrey" Focusable="true" Width="50" Height="Stretched" AllowDrag="true" StartDrag="W_StartDrag" EndDrag="W_EndDrag" Drop="W_Drop"/>/>
+	</HorizontalStack>
+	<Widget Height="20" Focusable="true"/>
+	<HorizontalStack Margin="20" Name="zone2" Height="150" Width="Stretched" Background="Grey" AllowDrop="true" DragEnter="W_DragEnter" DragLeave="W_DragLeave">
+	</HorizontalStack>
+	<Widget Height="20"/>
+	<HorizontalStack Margin="20" Name="zone3" Height="80" Width="Stretched" Background="Grey" AllowDrop="true" DragEnter="W_DragEnter" DragLeave="W_DragLeave">
+	</HorizontalStack>
+	<Button Caption="Refresh tree" MouseClick="refreshGraphicTree"/>
+	<TreeView IsRoot="true" Name="treeView" Data="{GraphicTree}">
+		<ItemTemplate>
+			<Border Width="Stretched" Focusable="true" Foreground="Transparent">
+				<HorizontalStack Spacing="5">
+					<Widget Width="5" Height="5"/>
+					<Border Width="16" Height="16" Foreground="Black" Background="DimGrey">
+						<Image Margin="2" Path="{GetIcon}" />
+					</Border>
+					<Widget Width="2" Height="5" Background="Blue" Visible="{IsHover}"/>
+					<Widget Width="5" Height="5" Background="Green" Visible="{Visible}"/>
+					<Label Text="{Name}" Width="Fit"/>
+					<Label Text="{LogicalParent}" Width="Stretched" Foreground="Yellow"/>
+				</HorizontalStack>
+			</Border>
+		</ItemTemplate>
+		<ItemTemplate DataType="Crow.Group" Data="GetChildren"
+			Path="#ui.GTreeExp.itemp"/>
+		<ItemTemplate DataType="Crow.Container" Data="GetChildren"
+			Path="#ui.GTreeExp.itemp"/>
+		<ItemTemplate DataType="Crow.TemplatedContainer" Data="GetChildren"
+			Path="#ui.GTreeExp.itemp"/>
+		<ItemTemplate DataType="Crow.TemplatedGroup" Data="GetChildren"
+			Path="#ui.GTreeExp.itemp"/>
+	</TreeView>
+</VerticalStack>
\ No newline at end of file
-- 
2.47.3