Object graph visualizer - scrolling of view area.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@4353 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/Misc/Debugger/Debugger.AddIn/Project/Debugger.AddIn.csproj

@@ -122,6 +122,7 @@
     <Compile Include="Src\Service\DebuggerEventForm.Designer.cs">
       <DependentUpon>DebuggerEventForm.cs</DependentUpon>
     </Compile>
+    <Compile Include="Src\Visualizers\Controls\DragScrollViewer.cs" />
     <Compile Include="Src\Visualizers\Utils\TypeResolver.cs" />
     <EmbeddedResource Include="Src\Service\DebuggeeExceptionForm.resx">
       <DependentUpon>DebuggeeExceptionForm.cs</DependentUpon>
@@ -311,6 +312,7 @@
     <Folder Include="Src\Visualizers\Graph\Graphviz" />
     <Folder Include="Src\Visualizers\Graph\ObjectGraph" />
     <Folder Include="Src\Visualizers\GridVisualizer\ValueProviders" />
+    <Folder Include="Src\Visualizers\Controls" />
     <Folder Include="Src\Visualizers\Utils" />
     <Folder Include="Src\Visualizers\GridVisualizer" />
     <Folder Include="Src\Visualizers\PresentationBindings" />

src/AddIns/Misc/Debugger/Debugger.AddIn/Project/Src/Visualizers/Controls/DragScrollViewer.cs

@@ -0,0 +1,87 @@
+// <file>
+//     <copyright see="prj:///doc/copyright.txt"/>
+//     <license see="prj:///doc/license.txt"/>
+//     <owner name="Martin Koníček" email="martin.konicek@gmail.com"/>
+//     <version>$Revision$</version>
+// </file>
+using System;
+using System.Windows.Controls;
+using System.Windows;
+using System.Windows.Input;
+
+namespace Debugger.AddIn.Visualizers.Controls
+{
+	/// <summary>
+	/// ScrollViewer with support for drag-scrolling.
+	/// </summary>
+	public class DragScrollViewer : ScrollViewer
+	{
+		private bool isScrolling = false;
+		private Point startDragPos;
+		private Point scrollStartOffset;
+
+		public DragScrollViewer() : base()
+		{
+			this.PreviewMouseDown += new System.Windows.Input.MouseButtonEventHandler(DragScrollViewer_PreviewMouseDown);
+			this.PreviewMouseMove += new System.Windows.Input.MouseEventHandler(DragScrollViewer_PreviewMouseMove);
+			this.PreviewMouseUp += new System.Windows.Input.MouseButtonEventHandler(DragScrollViewer_PreviewMouseUp);
+		}
+
+		void DragScrollViewer_PreviewMouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
+		{
+			if (e.LeftButton == MouseButtonState.Pressed && this.IsMouseDirectlyOver)
+			{
+				startDragPos = e.GetPosition(this);
+				scrollStartOffset.X = this.HorizontalOffset;
+				scrollStartOffset.Y = this.VerticalOffset;
+
+				this.Cursor = this.canScroll() ? Cursors.ScrollAll : Cursors.Arrow;
+
+				this.isScrolling = true;
+				this.CaptureMouse();
+				base.OnPreviewMouseDown(e);
+			}
+		}
+
+		void DragScrollViewer_PreviewMouseMove(object sender, System.Windows.Input.MouseEventArgs e)
+		{
+			if (this.isScrolling)
+			{
+				Point currentPos = e.GetPosition(this);
+
+				Vector delta = getScrollDelta(this.startDragPos, currentPos);
+
+				this.ScrollToHorizontalOffset(this.scrollStartOffset.X + delta.X);
+				this.ScrollToVerticalOffset(this.scrollStartOffset.Y + delta.Y);
+			}
+			base.OnPreviewMouseMove(e); 
+		}
+		
+		void DragScrollViewer_PreviewMouseUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
+		{
+			if (e.LeftButton == MouseButtonState.Released)
+			{
+				if (this.isScrolling)
+				{
+					this.Cursor = Cursors.Arrow;
+					this.isScrolling = false;
+					this.ReleaseMouseCapture();
+				}
+				base.OnPreviewMouseUp(e);
+			}
+		}
+
+		private Vector getScrollDelta(Point startPos, Point currentPos)
+		{
+			double dx = startPos.X - currentPos.X;
+			double dy = startPos.Y - currentPos.Y;
+			//return new Vector(Math.Sign(dx)*dx*dx*0.01, Math.Sign(dy)*dy*dy*0.01);
+			return new Vector(dx, dy);
+		}
+		
+		private bool canScroll()
+		{
+			return (this.ExtentWidth > this.ViewportWidth) || (this.ExtentHeight > this.ViewportHeight);
+		}
+	}
+}

src/AddIns/Misc/Debugger/Debugger.AddIn/Project/Src/Visualizers/Graph/Drawing/GraphDrawer.cs

@@ -38,6 +38,9 @@ namespace Debugger.AddIn.Visualizers.Graph
 		/// <param name="diff"></param>
 		public void StartAnimation(PositionedGraph oldGraph, PositionedGraph newGraph, GraphDiff diff)
 		{
+			this.canvas.Width = newGraph.BoundingRect.Width;
+			this.canvas.Height = newGraph.BoundingRect.Height;
+			
 			if (oldGraph == null)
 			{
 				Draw(newGraph);

src/AddIns/Misc/Debugger/Debugger.AddIn/Project/Src/Visualizers/Graph/VisualizerWPFWindow.xaml

@@ -2,9 +2,14 @@
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:dv="clr-namespace:Debugger.AddIn.Visualizers.Graph"
+    xmlns:controls="clr-namespace:Debugger.AddIn.Visualizers.Controls"
     Title="Object graph visualizer" Height="400" Width="600">
-    <StackPanel>
-        <StackPanel Orientation="Horizontal" Background="AliceBlue">
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"></RowDefinition>
+            <RowDefinition></RowDefinition>
+        </Grid.RowDefinitions>
+        <StackPanel Grid.Row="0" Grid.Column="0" Orientation="Horizontal" Background="AliceBlue" VerticalAlignment="Top">
 
             <StackPanel.Resources>
                 <Style TargetType="TextBlock">
@@ -32,8 +37,10 @@
             </Border>
         </StackPanel>
 
-        <Canvas Name="canvas" Margin="4">
-        </Canvas>
+    	<controls:DragScrollViewer x:Name="scroller" Margin="0 4 0 0" Grid.Row="1" Grid.Column="0" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto">
+       		<Canvas HorizontalAlignment="Left" VerticalAlignment="Top" Name="canvas" Margin="4">
+	       </Canvas>
+		</controls:DragScrollViewer>
 
-    </StackPanel>
+    </Grid>
 </Window>