Basic Impl. of DrawLine support on Canvas.

Need to work on this a little bit more

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/Controls/DragListener.cs

@@ -44,6 +44,21 @@ namespace ICSharpCode.WpfDesign.Designer.Controls
 			Target.PreviewMouseLeftButtonUp += Target_MouseUp;
 		}
 		
+		public void ExternalStart()
+		{
+			Target_MouseDown(null, null);
+		}
+		
+		public void ExternalMouseMove(MouseEventArgs e)
+		{
+			Target_MouseMove(null, e);
+		}
+		
+		public void ExternalStop()
+		{
+			Target_MouseUp(null, null);
+		}
+
 		static DragListener CurrentListener;
 
 		static void PostProcessInput(object sender, ProcessInputEventArgs e)

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/Extensions/CanvasDrawLineBehavior.cs

@@ -0,0 +1,114 @@
+// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
+using System.Windows.Shapes;
+using ICSharpCode.WpfDesign.Extensions;
+using ICSharpCode.WpfDesign.Designer.Services;
+
+namespace ICSharpCode.WpfDesign.Designer.Extensions
+{
+	[ExtensionFor(typeof(Canvas))]
+	public class CanvasDrawLineBehavior : BehaviorExtension, IDrawItemBehavior
+	{
+		protected override void OnInitialized()
+		{
+			base.OnInitialized();
+			if (ExtendedItem.ContentProperty == null || Metadata.IsPlacementDisabled(ExtendedItem.ComponentType))
+				return;
+			ExtendedItem.AddBehavior(typeof(IDrawItemBehavior), this);
+		}
+
+		#region IDrawItemBehavior implementation
+
+		public bool CanItemBeDrawn(Type createItemType)
+		{
+			return createItemType == typeof(Line);
+		}
+		
+		public void StartDrawItem(DesignItem clickedOn, DesignItem createdItem, ChangeGroup changeGroup, IDesignPanel panel, System.Windows.Input.MouseEventArgs e)
+		{
+			var startPoint = e.GetPosition(clickedOn.View);
+			var operation = PlacementOperation.TryStartInsertNewComponents(clickedOn,
+			                                                               new DesignItem[] { createdItem },
+			                                                               new Rect[] { new Rect(startPoint.X, startPoint.Y, 1, 1) },
+			                                                               PlacementType.AddItem);
+			if (operation != null) {
+				createdItem.Services.Selection.SetSelectedComponents(new DesignItem[] { createdItem });
+				operation.Commit();
+			}
+			
+			
+			//changeGroup.Commit();
+			
+			var lineHandler = createdItem.Extensions.OfType<LineHandlerExtension>().First();
+			lineHandler.DragListener.ExternalStart();
+			
+			new DrawLineMouseGesture(lineHandler, clickedOn.View).Start(panel, (MouseButtonEventArgs) e);
+		}
+
+		#endregion
+	}
+	
+	sealed class DrawLineMouseGesture : ClickOrDragMouseGesture
+	{
+		LineHandlerExtension l;
+		
+		public DrawLineMouseGesture(LineHandlerExtension l, IInputElement relativeTo)
+		{
+			this.l = l;
+			this.positionRelativeTo = relativeTo;
+		}
+		
+		protected override void OnMouseMove(object sender, MouseEventArgs e)
+		{
+			base.OnMouseMove(sender, e);
+			l.DragListener.ExternalMouseMove(e);
+		}
+		
+		protected override void OnMouseUp(object sender, MouseButtonEventArgs e)
+		{
+			l.DragListener.ExternalStop();
+			base.OnMouseUp(sender, e);
+		}
+
+		protected override void OnStopped()
+		{
+			//if (operation != null)
+			//{
+			//    operation.Abort();
+			//    operation = null;
+			//}
+			//if (changeGroup != null)
+			//{
+			//    changeGroup.Abort();
+			//    changeGroup = null;
+			//}
+			if (services.Tool.CurrentTool is CreateComponentTool)
+			{
+				services.Tool.CurrentTool = services.Tool.PointerTool;
+			}
+			base.OnStopped();
+		}
+		
+	}
+}

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/Extensions/LineHandlerExtension.cs

@@ -49,6 +49,8 @@ namespace ICSharpCode.WpfDesign.Designer.Extensions
 		//Size oldSize;
 		ZoomControl zoom;
 
+		public DragListener DragListener {get; private set;}
+		
 		protected ResizeThumb CreateThumb(PlacementAlignment alignment, Cursor cursor)
 		{
 			ResizeThumb resizeThumb = new ResizeThumb { Alignment = alignment, Cursor = cursor, IsPrimarySelection = true};
@@ -56,10 +58,11 @@ namespace ICSharpCode.WpfDesign.Designer.Extensions
 
 			adornerPanel.Children.Add(resizeThumb);
 
-			DragListener drag = new DragListener(resizeThumb);
+			DragListener = new DragListener(resizeThumb);
-			drag.Started += drag_Started;
+			DragListener.Started += drag_Started;
-			drag.Changed += drag_Changed;
+			DragListener.Changed += drag_Changed;
-			drag.Completed += drag_Completed;
+			DragListener.Completed += drag_Completed;
+			
 			return resizeThumb;
 		}
 

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/Services/CreateComponentTool.cs

@@ -201,9 +201,17 @@ namespace ICSharpCode.WpfDesign.Designer.Services
 				IDesignPanel designPanel = (IDesignPanel)sender;
 				DesignPanelHitTestResult result = designPanel.HitTest(e.GetPosition(designPanel), false, true, HitTestType.Default);
 				if (result.ModelHit != null) {
-					IPlacementBehavior behavior = result.ModelHit.GetBehavior<IPlacementBehavior>();
+					var drawItembehavior = result.ModelHit.GetBehavior<IDrawItemBehavior>();
-					if (behavior != null) {
+					if (drawItembehavior != null && drawItembehavior.CanItemBeDrawn(componentType)) {
-						DesignItem createdItem = CreateItem(designPanel.Context);
+						var createdItem = CreateItem(designPanel.Context);
+						drawItembehavior.StartDrawItem(result.ModelHit, createdItem, changeGroup, designPanel, e);
+						// IDrawItemBehavior now is responsible for the changeGroup created by CreateItem()
+						changeGroup = null;
+					}
+					else {
+						var placementBehavior = result.ModelHit.GetBehavior<IPlacementBehavior>();
+						if (placementBehavior != null) {
+							var createdItem = CreateItem(designPanel.Context);
 						
 							new CreateComponentMouseGesture(result.ModelHit, createdItem, changeGroup).Start(designPanel, e);
 							// CreateComponentMouseGesture now is responsible for the changeGroup created by CreateItem()
@@ -213,6 +221,7 @@ namespace ICSharpCode.WpfDesign.Designer.Services
 				}
 			}
 		}
+	}
 	
 	sealed class CreateComponentMouseGesture : ClickOrDragMouseGesture
 	{

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.Designer/Project/WpfDesign.Designer.csproj

@@ -86,6 +86,7 @@
     <Compile Include="ArrangeDirection.cs" />
     <Compile Include="Controls\RenderTransformOriginThumb.cs" />
     <Compile Include="Extensions\BorderForImageControl.cs" />
+    <Compile Include="Extensions\CanvasDrawLineBehavior.cs" />
     <Compile Include="Extensions\DefaultCommandsContextMenu.xaml.cs">
       <DependentUpon>DefaultCommandsContextMenu.xaml</DependentUpon>
       <SubType>Code</SubType>

src/AddIns/DisplayBindings/WpfDesign/WpfDesign/Project/DrawItemBehavior.cs

@@ -0,0 +1,35 @@
+// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System;
+using System.Collections.Generic;
+using System.Windows;
+using System.Windows.Input;
+
+namespace ICSharpCode.WpfDesign
+{
+	/// <summary>
+	/// Behavior interface implemented by container elements to support resizing
+	/// drawing new Elements
+	/// </summary>
+	public interface IDrawItemBehavior
+	{
+		bool CanItemBeDrawn(Type createItemType);
+		void StartDrawItem(DesignItem clickedOn, DesignItem createdItem, ChangeGroup changeGroup, IDesignPanel panel, MouseEventArgs e);
+	}
+}

src/AddIns/DisplayBindings/WpfDesign/WpfDesign/Project/WpfDesign.csproj

@@ -73,6 +73,7 @@
     <Compile Include="Adorners\AdornerProvider.cs" />
     <Compile Include="Adorners\AdornerProviderClasses.cs" />
     <Compile Include="Adorners\RelativePlacement.cs" />
+    <Compile Include="DrawItemBehavior.cs" />
     <Compile Include="DummyValueInsteadOfNullTypeDescriptionProvider.cs" />
     <Compile Include="ExtensionMethods.cs" />
     <Compile Include="Extensions\ExtensionAttribute.cs" />