DragSelectionMessageFilter.cs source code in C# .NET

                        
Code:
                         / 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WF / Common / AuthoringOM / Design / MessageFilters / DragSelectionMessageFilter.cs / 1305376 / DragSelectionMessageFilter.cs
                        

                        
                            namespace System.Workflow.ComponentModel.Design 
{
 	using System;
	using System.Drawing;
	using System.Diagnostics; 
	using System.Collections;
 	using System.Windows.Forms; 
	using System.ComponentModel.Design; 

 	#region Class DragRectangleMessageFilter 
 	///This behavior requires the coordinates in logical coordinate system
	internal class DragRectangleMessageFilter : WorkflowDesignerMessageFilter
 	{
		#region Members and Constructor 
		private Point startDrag = Point.Empty;
		private Point endDrag = Point.Empty; 
 		private bool dragStarted = false; 
		internal event EventHandler DragComplete;
 		private Cursor previousCursor = Cursors.Default; 

 		internal DragRectangleMessageFilter()
		{
 		} 
		#endregion
 
		#region MessageFilter Overrides 
		protected override void Dispose(bool disposing)
 		{ 
			try
 			{
 				DragStarted = false;
			} 
 			finally
			{ 
				base.Dispose(disposing); 
			}
 		} 

		protected override bool OnMouseCaptureChanged()
 		{
 			DragStarted = false; 
			return false;
 		} 
 
		protected override bool OnMouseDown(MouseEventArgs eventArgs)
		{ 
			Debug.Assert(this.dragStarted == false);
 			if (eventArgs.Button == MouseButtons.Left)
				this.startDrag = this.endDrag = ParentView.ClientPointToLogical(new Point(eventArgs.X, eventArgs.Y));
 
 			return false;
 		} 
 
		protected override bool OnMouseMove(MouseEventArgs eventArgs)
 		{ 
			WorkflowView parentView = ParentView;
			Point logicalPoint = parentView.ClientPointToLogical(new Point(eventArgs.X, eventArgs.Y));

			//We do nothing if the logical coordinate is not in the active layout 
 			//
 
  

 			float dragMultiply = 2.0f / (float)parentView.Zoom * 100.0f; 
			if (!this.dragStarted && (eventArgs.Button & MouseButtons.Left) > 0 &&
 				(Math.Abs(this.startDrag.X - logicalPoint.X) > (int)(dragMultiply * (float)SystemInformation.DragSize.Width) || Math.Abs(this.startDrag.Y - logicalPoint.Y) > (int)(dragMultiply * (float)SystemInformation.DragSize.Height)))
				DragStarted = true;
 
			if (this.dragStarted)
			{ 
 				if (!DragRectangle.IsEmpty) 
					parentView.InvalidateLogicalRectangle(DragRectangle);
 
 				this.endDrag = logicalPoint;

 				if (!DragRectangle.IsEmpty)
					parentView.InvalidateLogicalRectangle(DragRectangle); 
 			}
 
			return this.dragStarted; 
		}
 
		protected override bool OnMouseUp(MouseEventArgs eventArgs)
 		{
			if (this.dragStarted)
 			{ 
 				WorkflowView parentView = ParentView;
 
				//Invalidate the old rectangle so that we state the drag is complete 
 				if (!DragRectangle.IsEmpty)
					parentView.InvalidateLogicalRectangle(DragRectangle); 

				//End the actual drag/drop
				this.endDrag = parentView.ClientPointToLogical(new Point(eventArgs.X, eventArgs.Y));
 				DragStarted = false; 

				//Send the notification of successful drag 
 				if (this.DragComplete != null) 
 					this.DragComplete(this, EventArgs.Empty);
 
				return true;
 			}

			return false; 
		}
 
		protected override bool OnKeyDown(KeyEventArgs eventArgs) 
 		{
			if (eventArgs.KeyValue == (int)Keys.Escape) 
 				DragStarted = false;
 			return false;
		}
 
 		protected override bool OnPaint(PaintEventArgs e, Rectangle viewPort, AmbientTheme ambientTheme)
		{ 
			if (this.dragStarted) 
			{
 				using (Brush dragRectangleBrush = new SolidBrush(Color.FromArgb(10, ambientTheme.SelectionForeColor))) 
				{
 					Rectangle dragRectangle = DragRectangle;
 					e.Graphics.FillRectangle(dragRectangleBrush, dragRectangle.X, dragRectangle.Y, dragRectangle.Width - 1, dragRectangle.Height - 1);
					e.Graphics.DrawRectangle(ambientTheme.SelectionForegroundPen, dragRectangle.X, dragRectangle.Y, dragRectangle.Width - 1, dragRectangle.Height - 1); 
 				}
			} 
			return false; 
		}
 		#endregion 

		#region Helpers
 		internal Rectangle DragRectangle
 		{ 
			get
 			{ 
				return new Rectangle(Math.Min(this.startDrag.X, this.endDrag.X), Math.Min(this.startDrag.Y, this.endDrag.Y), Math.Abs(this.endDrag.X - this.startDrag.X), Math.Abs(this.endDrag.Y - this.startDrag.Y)); 
			}
		} 

 		protected bool DragStarted
		{
 			get 
 			{
				return this.dragStarted; 
 			} 

			set 
			{
				if (this.dragStarted != value)
 				{
					WorkflowView parentView = ParentView; 
 					if (value)
 					{ 
						this.dragStarted = true; 
 						this.previousCursor = parentView.Cursor;
						parentView.Cursor = Cursors.Cross; 
						parentView.Capture = true;
					}
 					else
					{ 
 						parentView.Capture = false;
 						this.dragStarted = false; 
						if (this.previousCursor != null) 
 							parentView.Cursor = this.previousCursor;
 
						if (!DragRectangle.IsEmpty)
							parentView.InvalidateLogicalRectangle(DragRectangle);
					}
 				} 
			}
 		} 
 		#endregion 
	}
 	#endregion 

	#region Class DragSelectionMessageFilter
	//This behavior needs logical coordinates
	internal sealed class DragSelectionMessageFilter : DragRectangleMessageFilter 
 	{
		#region Members and Constructor 
 		internal DragSelectionMessageFilter() 
 		{
		} 
 		#endregion

		#region MessageFilter Overrides
		protected override bool OnMouseDown(MouseEventArgs eventArgs) 
		{
 			if ((Control.ModifierKeys & Keys.Shift) > 0) 
			{ 
 				base.OnMouseDown(eventArgs);
 				return true; 
			}
 			return false;
		}
 
		protected override bool OnMouseMove(MouseEventArgs eventArgs)
		{ 
 			if ((Control.ModifierKeys & Keys.Shift) > 0) 
			{
 				base.OnMouseMove(eventArgs); 
 				return true;
			}
 			return false;
		} 

		protected override bool OnMouseUp(MouseEventArgs eventArgs) 
		{ 
 			if ((Control.ModifierKeys & Keys.Shift) > 0)
			{ 
 				base.OnMouseUp(eventArgs);

 				//Select all the shapes
				WorkflowView parentView = ParentView; 
 				if (!DragRectangle.IsEmpty && parentView.RootDesigner != null)
				{ 
					ActivityDesigner[] intersectingDesigners = CompositeActivityDesigner.GetIntersectingDesigners(parentView.RootDesigner, DragRectangle); 
					ArrayList selectableComponents = new ArrayList();
 					foreach (ActivityDesigner activityDesigner in intersectingDesigners) 
						selectableComponents.Add(activityDesigner.Activity);

 					ISelectionService selectionService = GetService(typeof(ISelectionService)) as ISelectionService;
 					if (selectableComponents.Count > 0 && selectionService != null) 
						selectionService.SetSelectedComponents((object[])selectableComponents.ToArray(typeof(object)), SelectionTypes.Replace);
 				} 
 
				return true;
			} 
			return false;
 		}

		protected override bool OnKeyUp(KeyEventArgs eventArgs) 
 		{
 			base.OnKeyUp(eventArgs); 
			if ((Control.ModifierKeys & Keys.Shift) == 0) 
 				DragStarted = false;
 
			return false;
		}
		#endregion
 	} 
	#endregion
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
namespace System.Workflow.ComponentModel.Design 
{
 	using System;
	using System.Drawing;
	using System.Diagnostics; 
	using System.Collections;
 	using System.Windows.Forms; 
	using System.ComponentModel.Design; 

 	#region Class DragRectangleMessageFilter 
 	///This behavior requires the coordinates in logical coordinate system
	internal class DragRectangleMessageFilter : WorkflowDesignerMessageFilter
 	{
		#region Members and Constructor 
		private Point startDrag = Point.Empty;
		private Point endDrag = Point.Empty; 
 		private bool dragStarted = false; 
		internal event EventHandler DragComplete;
 		private Cursor previousCursor = Cursors.Default; 

 		internal DragRectangleMessageFilter()
		{
 		} 
		#endregion
 
		#region MessageFilter Overrides 
		protected override void Dispose(bool disposing)
 		{ 
			try
 			{
 				DragStarted = false;
			} 
 			finally
			{ 
				base.Dispose(disposing); 
			}
 		} 

		protected override bool OnMouseCaptureChanged()
 		{
 			DragStarted = false; 
			return false;
 		} 
 
		protected override bool OnMouseDown(MouseEventArgs eventArgs)
		{ 
			Debug.Assert(this.dragStarted == false);
 			if (eventArgs.Button == MouseButtons.Left)
				this.startDrag = this.endDrag = ParentView.ClientPointToLogical(new Point(eventArgs.X, eventArgs.Y));
 
 			return false;
 		} 
 
		protected override bool OnMouseMove(MouseEventArgs eventArgs)
 		{ 
			WorkflowView parentView = ParentView;
			Point logicalPoint = parentView.ClientPointToLogical(new Point(eventArgs.X, eventArgs.Y));

			//We do nothing if the logical coordinate is not in the active layout 
 			//
 
  

 			float dragMultiply = 2.0f / (float)parentView.Zoom * 100.0f; 
			if (!this.dragStarted && (eventArgs.Button & MouseButtons.Left) > 0 &&
 				(Math.Abs(this.startDrag.X - logicalPoint.X) > (int)(dragMultiply * (float)SystemInformation.DragSize.Width) || Math.Abs(this.startDrag.Y - logicalPoint.Y) > (int)(dragMultiply * (float)SystemInformation.DragSize.Height)))
				DragStarted = true;
 
			if (this.dragStarted)
			{ 
 				if (!DragRectangle.IsEmpty) 
					parentView.InvalidateLogicalRectangle(DragRectangle);
 
 				this.endDrag = logicalPoint;

 				if (!DragRectangle.IsEmpty)
					parentView.InvalidateLogicalRectangle(DragRectangle); 
 			}
 
			return this.dragStarted; 
		}
 
		protected override bool OnMouseUp(MouseEventArgs eventArgs)
 		{
			if (this.dragStarted)
 			{ 
 				WorkflowView parentView = ParentView;
 
				//Invalidate the old rectangle so that we state the drag is complete 
 				if (!DragRectangle.IsEmpty)
					parentView.InvalidateLogicalRectangle(DragRectangle); 

				//End the actual drag/drop
				this.endDrag = parentView.ClientPointToLogical(new Point(eventArgs.X, eventArgs.Y));
 				DragStarted = false; 

				//Send the notification of successful drag 
 				if (this.DragComplete != null) 
 					this.DragComplete(this, EventArgs.Empty);
 
				return true;
 			}

			return false; 
		}
 
		protected override bool OnKeyDown(KeyEventArgs eventArgs) 
 		{
			if (eventArgs.KeyValue == (int)Keys.Escape) 
 				DragStarted = false;
 			return false;
		}
 
 		protected override bool OnPaint(PaintEventArgs e, Rectangle viewPort, AmbientTheme ambientTheme)
		{ 
			if (this.dragStarted) 
			{
 				using (Brush dragRectangleBrush = new SolidBrush(Color.FromArgb(10, ambientTheme.SelectionForeColor))) 
				{
 					Rectangle dragRectangle = DragRectangle;
 					e.Graphics.FillRectangle(dragRectangleBrush, dragRectangle.X, dragRectangle.Y, dragRectangle.Width - 1, dragRectangle.Height - 1);
					e.Graphics.DrawRectangle(ambientTheme.SelectionForegroundPen, dragRectangle.X, dragRectangle.Y, dragRectangle.Width - 1, dragRectangle.Height - 1); 
 				}
			} 
			return false; 
		}
 		#endregion 

		#region Helpers
 		internal Rectangle DragRectangle
 		{ 
			get
 			{ 
				return new Rectangle(Math.Min(this.startDrag.X, this.endDrag.X), Math.Min(this.startDrag.Y, this.endDrag.Y), Math.Abs(this.endDrag.X - this.startDrag.X), Math.Abs(this.endDrag.Y - this.startDrag.Y)); 
			}
		} 

 		protected bool DragStarted
		{
 			get 
 			{
				return this.dragStarted; 
 			} 

			set 
			{
				if (this.dragStarted != value)
 				{
					WorkflowView parentView = ParentView; 
 					if (value)
 					{ 
						this.dragStarted = true; 
 						this.previousCursor = parentView.Cursor;
						parentView.Cursor = Cursors.Cross; 
						parentView.Capture = true;
					}
 					else
					{ 
 						parentView.Capture = false;
 						this.dragStarted = false; 
						if (this.previousCursor != null) 
 							parentView.Cursor = this.previousCursor;
 
						if (!DragRectangle.IsEmpty)
							parentView.InvalidateLogicalRectangle(DragRectangle);
					}
 				} 
			}
 		} 
 		#endregion 
	}
 	#endregion 

	#region Class DragSelectionMessageFilter
	//This behavior needs logical coordinates
	internal sealed class DragSelectionMessageFilter : DragRectangleMessageFilter 
 	{
		#region Members and Constructor 
 		internal DragSelectionMessageFilter() 
 		{
		} 
 		#endregion

		#region MessageFilter Overrides
		protected override bool OnMouseDown(MouseEventArgs eventArgs) 
		{
 			if ((Control.ModifierKeys & Keys.Shift) > 0) 
			{ 
 				base.OnMouseDown(eventArgs);
 				return true; 
			}
 			return false;
		}
 
		protected override bool OnMouseMove(MouseEventArgs eventArgs)
		{ 
 			if ((Control.ModifierKeys & Keys.Shift) > 0) 
			{
 				base.OnMouseMove(eventArgs); 
 				return true;
			}
 			return false;
		} 

		protected override bool OnMouseUp(MouseEventArgs eventArgs) 
		{ 
 			if ((Control.ModifierKeys & Keys.Shift) > 0)
			{ 
 				base.OnMouseUp(eventArgs);

 				//Select all the shapes
				WorkflowView parentView = ParentView; 
 				if (!DragRectangle.IsEmpty && parentView.RootDesigner != null)
				{ 
					ActivityDesigner[] intersectingDesigners = CompositeActivityDesigner.GetIntersectingDesigners(parentView.RootDesigner, DragRectangle); 
					ArrayList selectableComponents = new ArrayList();
 					foreach (ActivityDesigner activityDesigner in intersectingDesigners) 
						selectableComponents.Add(activityDesigner.Activity);

 					ISelectionService selectionService = GetService(typeof(ISelectionService)) as ISelectionService;
 					if (selectableComponents.Count > 0 && selectionService != null) 
						selectionService.SetSelectedComponents((object[])selectableComponents.ToArray(typeof(object)), SelectionTypes.Replace);
 				} 
 
				return true;
			} 
			return false;
 		}

		protected override bool OnKeyUp(KeyEventArgs eventArgs) 
 		{
 			base.OnKeyUp(eventArgs); 
			if ((Control.ModifierKeys & Keys.Shift) == 0) 
 				DragStarted = false;
 
			return false;
		}
		#endregion
 	} 
	#endregion
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

                        

                        

                        
                        

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