WindowManager.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

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

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

	#region Class WindowManager
 	//This behavior needs the logical coordinates 
 	internal sealed class WindowManager : WorkflowDesignerMessageFilter
	{ 
 		#region Members and Constructor 
		private ActivityDesigner currentActiveDesigner = null;
 
		internal WindowManager()
		{
 		}
		#endregion 

 		#region MessageFilter Overrides 
 		protected override bool OnMouseDown(MouseEventArgs eventArgs) 
		{
 			Point clientPoint = new Point(eventArgs.X, eventArgs.Y); 

			//If the point is not in clickable area then return
			WorkflowView parentView = ParentView;
			if (!parentView.IsClientPointInActiveLayout(clientPoint)) 
 				return true;
 
			//Check if the mouse is hit on designer 
 			object selectedObject = null;
 			HitTestInfo hitTestInfo = MessageHitTestContext; 
			if (hitTestInfo == HitTestInfo.Nowhere)
 				selectedObject = parentView.RootDesigner.Activity;
			else
				selectedObject = hitTestInfo.SelectableObject; 

            //Selection service handles KeyModifiers, ctrl and shift will be handled as per the standard behavior 
			if (selectedObject != null) 
 			{
				ISelectionService selectionService = GetService(typeof(ISelectionService)) as ISelectionService; 
 				if (selectionService != null)
 					selectionService.SetSelectedComponents(new object[] { selectedObject }, SelectionTypes.Primary);
			}
 
 			//Designer designates an area as action area if there is some special significance associated with the area ie Expand Collapse
			//In such cases we give activity designer an oppertunity to take action when mouse click happens on the area 
			//if there are Ctrl or Shift keys pressed, only do the selection change, dont call the child designer 
			//Now that the designer is selected
 			if (this.currentActiveDesigner != hitTestInfo.AssociatedDesigner) 
            {
                if (this.currentActiveDesigner != null)
                    ((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseLeave();
 
				this.currentActiveDesigner = hitTestInfo.AssociatedDesigner;
 
                if (this.currentActiveDesigner != null) 
 					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseEnter(eventArgs);
            } 

            if (this.currentActiveDesigner != null && ((Control.ModifierKeys & (Keys.Control | Keys.Shift)) == 0))
 				((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseDown(eventArgs);
 
			return false;
 		} 
 
		protected override bool OnMouseMove(MouseEventArgs eventArgs)
		{ 
			Point clientPoint = new Point(eventArgs.X, eventArgs.Y);

 			//If the mouse is not in a valid area then we return
			if (!ParentView.IsClientPointInActiveLayout(clientPoint)) 
 			{
 				if (this.currentActiveDesigner != null) 
					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseLeave(); 
 				this.currentActiveDesigner = null;
				return true; 
			}

			//Now check which designer is hit
 			HitTestInfo hitTestInfo = MessageHitTestContext; 
			if (this.currentActiveDesigner != hitTestInfo.AssociatedDesigner)
            { 
 				if (this.currentActiveDesigner != null) 
 					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseLeave();
 
				this.currentActiveDesigner = hitTestInfo.AssociatedDesigner;

                if (this.currentActiveDesigner != null)
 					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseEnter(eventArgs); 
			}
			else 
			{ 
 				if (this.currentActiveDesigner != null)
					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseMove(eventArgs); 
 			}

 			return false;
		} 

 		protected override bool OnMouseUp(MouseEventArgs eventArgs) 
		{ 
			Point clientPoint = new Point(eventArgs.X, eventArgs.Y);
 
			//If the mouse is not in a valid area then we return
 			if (!ParentView.IsClientPointInActiveLayout(clientPoint))
			{
 				if (this.currentActiveDesigner != null) 
 					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseLeave();
				this.currentActiveDesigner = null; 
 				return true; 
			}
 
			//Now check which designer is hit
			HitTestInfo hitTestInfo = MessageHitTestContext;
 			if (this.currentActiveDesigner != hitTestInfo.AssociatedDesigner)
            { 
				if (this.currentActiveDesigner != null)
 					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseLeave(); 
 
 				this.currentActiveDesigner = hitTestInfo.AssociatedDesigner;
 
                if (this.currentActiveDesigner != null)
					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseEnter(eventArgs);
 			}
 
			//Dispatch the event
			if (this.currentActiveDesigner != null) 
				((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseUp(eventArgs); 

 			return false; 
		}

 		protected override bool OnMouseDoubleClick(MouseEventArgs eventArgs)
 		{ 
			ISelectionService selectionService = GetService(typeof(ISelectionService)) as ISelectionService;
 			if (selectionService != null) 
			{ 
				ArrayList selectedComponents = new ArrayList(selectionService.GetSelectedComponents());
				for (int i = 0; i < selectedComponents.Count; i++) 
 				{
                    Activity selectedComponent = selectedComponents[i] as Activity;
                    if (selectedComponent == null)
						continue; 

 					IDesigner designer = ActivityDesigner.GetDesigner(selectedComponent) as IDesigner; 
 					if (designer != null) 
					{
 						designer.DoDefaultAction(); 
						((IWorkflowDesignerMessageSink)designer).OnMouseDoubleClick(eventArgs);
						break;
					}
 				} 
			}
 
 			return false; 
 		}
 
		protected override bool OnMouseEnter(MouseEventArgs eventArgs)
 		{
			//Fire the event
			if (this.currentActiveDesigner != null) 
				((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseEnter(eventArgs);
 
 			return false; 
		}
 
 		protected override bool OnMouseHover(MouseEventArgs eventArgs)
 		{
			//Fire the event
 			if (this.currentActiveDesigner != null) 
				((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseHover(eventArgs);
 
			return false; 
		}
 
 		protected override bool OnMouseLeave()
		{
 			//Dispatch events
 			if (this.currentActiveDesigner != null) 
			{
 				((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseLeave(); 
				this.currentActiveDesigner = null; 
			}
 
			return false;
 		}

		protected override bool OnMouseWheel(MouseEventArgs eventArgs) 
 		{
 			UpdateViewOnMouseWheel(eventArgs, Control.ModifierKeys); 
			return true; 
 		}
 
		protected override bool OnMouseCaptureChanged()
		{
			//Dispatch events
 			if (this.currentActiveDesigner != null) 
			{
 				((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseCaptureChanged(); 
 			} 

			return false; 
 		}

		protected override bool OnDragEnter(DragEventArgs eventArgs)
		{ 
			if (this.currentActiveDesigner != null)
 			{ 
				((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseLeave(); 
 				this.currentActiveDesigner = null;
 			} 

			return false;
 		}
 
		protected override bool OnKeyDown(KeyEventArgs eventArgs)
		{ 
			if (eventArgs != null && (eventArgs.KeyCode == Keys.PageUp || eventArgs.KeyCode == Keys.PageDown)) 
 				UpdateViewOnPageUpDown(eventArgs.KeyCode == Keys.PageUp);
			ISelectionService selectionService = ((IServiceProvider)this.ParentView).GetService(typeof(ISelectionService)) as ISelectionService; 

 			//enter key (
 			if (eventArgs.KeyCode == Keys.Enter)
			{ 
 				// on enter key we want to do DoDefault of the designer
				IDesigner designer = ActivityDesigner.GetDesigner(selectionService.PrimarySelection as Activity) as IDesigner; 
				if (designer != null) 
				{
 					designer.DoDefaultAction(); 
					eventArgs.Handled = true;
 				}
 			}
			else if (eventArgs.KeyCode == Keys.Escape) 
 			{
				if (!eventArgs.Handled) 
				{ 
					CompositeActivityDesigner parentDesigner = ActivityDesigner.GetParentDesigner(selectionService.PrimarySelection);
 					if (parentDesigner != null) 
						selectionService.SetSelectedComponents(new object[] { parentDesigner.Activity }, SelectionTypes.Replace);

 					eventArgs.Handled = true;
 				} 
			}
            else if (eventArgs.KeyCode == Keys.Delete) 
            { 
                // check if we are cutting root component
                IDesignerHost designerHost = ((IServiceProvider)this.ParentView).GetService(typeof(IDesignerHost)) as IDesignerHost; 
                if (!(designerHost == null || selectionService.GetComponentSelected(designerHost.RootComponent)))
                {
                    //Check that we are cutting all activities
                    //Check if we are in writable context 
                    ICollection components = selectionService.GetSelectedComponents();
                    if (DesignerHelpers.AreComponentsRemovable(components)) 
                    { 
                        // check if we can delete these
                        List topLevelActivities = new List(Helpers.GetTopLevelActivities(selectionService.GetSelectedComponents())); 
                        bool needToDelete = (topLevelActivities.Count > 0);
                        IDictionary commonParentActivities = Helpers.PairUpCommonParentActivities(topLevelActivities);
                        foreach (DictionaryEntry entry in commonParentActivities)
                        { 
                            CompositeActivityDesigner compositeActivityDesigner = ActivityDesigner.GetDesigner(entry.Key as Activity) as CompositeActivityDesigner;
                            if (compositeActivityDesigner != null && !compositeActivityDesigner.CanRemoveActivities(new List((Activity[])((ArrayList)entry.Value).ToArray(typeof(Activity))).AsReadOnly())) 
                                needToDelete = false; 
                        }
 
                        if (needToDelete)
                        {
                            List connectors = new List();
                            foreach (object component in components) 
                            {
                                ConnectorHitTestInfo connector = component as ConnectorHitTestInfo; 
                                if (connector != null) 
                                    connectors.Add(connector);
                            } 

                            //cache selcted connectors before calling this func
                            CompositeActivityDesigner.RemoveActivities((IServiceProvider)this.ParentView, topLevelActivities.AsReadOnly(), SR.GetString(SR.DeletingActivities));
 
                            //add connectors back to the selection service
                            if (selectionService != null && connectors.Count > 0) 
                                selectionService.SetSelectedComponents(connectors, SelectionTypes.Add); 

                            eventArgs.Handled = true; 
                        }
                    }
                }
            } 
 			//navigation (left, right, up, down, tab, shift-tab)
			else if (eventArgs.KeyCode == Keys.Left || eventArgs.KeyCode == Keys.Right || eventArgs.KeyCode == Keys.Up || eventArgs.KeyCode == Keys.Down || eventArgs.KeyCode == Keys.Tab) 
			{ 
				//we'll pass it to the parent designer of the primary selected designer
 				//sequential designers just navigate between their children 
				//free form designers may move their children on arrow keys and navigate on tab
 				ActivityDesigner designer = ActivityDesigner.GetDesigner(selectionService.PrimarySelection as Activity) as ActivityDesigner;
 				if (designer != null && designer.ParentDesigner != null)
				{ 
 					//we will let the parent see if it wants to handle the event,
					//otherwise the selected designer itself will be called from a designer message filter below 
					((IWorkflowDesignerMessageSink)designer.ParentDesigner).OnKeyDown(eventArgs); 
					eventArgs.Handled = true;
 				} 
			}

 			if (!eventArgs.Handled)
 			{ 
				ActivityDesigner designerWithFocus = GetDesignerWithFocus();
 				if (designerWithFocus != null) 
					((IWorkflowDesignerMessageSink)designerWithFocus).OnKeyDown(eventArgs); 
			}
 
			return eventArgs.Handled;
 		}

		protected override bool OnKeyUp(KeyEventArgs eventArgs) 
 		{
 			ActivityDesigner designerWithFocus = GetDesignerWithFocus(); 
			if (designerWithFocus != null) 
 				((IWorkflowDesignerMessageSink)designerWithFocus).OnKeyUp(eventArgs);
 
			return false;
		}

        protected override bool OnScroll(ScrollBar sender, int value) 
        {
            ActivityDesigner designerWithFocus = GetDesignerWithFocus(); 
            if (designerWithFocus != null) 
                ((IWorkflowDesignerMessageSink)designerWithFocus).OnScroll(sender, value);
 
            return false;
        }

		protected override bool OnShowContextMenu(Point screenMenuPoint) 
 		{
			IMenuCommandService menuCommandService = GetService(typeof(IMenuCommandService)) as IMenuCommandService; 
 			if (menuCommandService != null) 
 				menuCommandService.ShowContextMenu(WorkflowMenuCommands.SelectionMenu, screenMenuPoint.X, screenMenuPoint.Y);
			return true; 
 		}

		protected override void OnLayout(LayoutEventArgs eventArgs)
		{ 
			WorkflowView parentView = ParentView;
 			using (Graphics graphics = parentView.CreateGraphics()) 
			{ 
 				if (parentView.RootDesigner != null)
 				{ 
					try
 					{
						((IWorkflowDesignerMessageSink)parentView.RootDesigner).OnLayoutSize(graphics);
					} 
					catch (Exception e)
 					{ 
						//Eat the exception thrown 
 						Debug.WriteLine(e);
 					} 

					try
 					{
						((IWorkflowDesignerMessageSink)parentView.RootDesigner).OnLayoutPosition(graphics); 
					}
					catch (Exception e) 
 					{ 
						//Eat the exception thrown
 						Debug.WriteLine(e); 
 					}
				}
 			}
		} 

		protected override bool ProcessMessage(Message message) 
		{ 
 			ActivityDesigner designerWithFocus = GetDesignerWithFocus();
			if (designerWithFocus != null) 
 				((IWorkflowDesignerMessageSink)designerWithFocus).ProcessMessage(message);

 			return false;
		} 

 		protected override void OnThemeChange() 
		{ 
			WorkflowView parentView = ParentView;
			if (parentView.RootDesigner != null) 
 				((IWorkflowDesignerMessageSink)parentView.RootDesigner).OnThemeChange();
		}
 		#endregion
 
 		#region Helpers
		private ActivityDesigner GetDesignerWithFocus() 
 		{ 
			ActivityDesigner designerWithFocus = null;
 
			ISelectionService selectionService = GetService(typeof(ISelectionService)) as ISelectionService;
			if (selectionService != null)
 			{
				object primarySelection = selectionService.PrimarySelection; 
 				if (primarySelection is Activity)
 					designerWithFocus = ActivityDesigner.GetDesigner(primarySelection as Activity); 
				else 
 					designerWithFocus = ActivityDesigner.GetParentDesigner(primarySelection);
			} 

			return designerWithFocus;
		}
 
 		private void UpdateViewOnPageUpDown(bool pageUp)
		{ 
 			WorkflowView parentView = ParentView; 
 			Point scrollPosition = parentView.ScrollPosition;
			scrollPosition.Y = scrollPosition.Y + ((pageUp ? -1 : 1) * parentView.VScrollBar.LargeChange); 
 			parentView.ScrollPosition = scrollPosition;
		}

		private void UpdateViewOnMouseWheel(MouseEventArgs eventArgs, Keys modifierKeys) 
		{
 			WorkflowView parentView = ParentView; 
			if (Control.ModifierKeys == Keys.Control) 
 			{
 				int newZoom = parentView.Zoom + ((eventArgs.Delta / 120) * 10); 
				newZoom = Math.Max(newZoom, AmbientTheme.MinZoom);
 				newZoom = Math.Min(newZoom, AmbientTheme.MaxZoom);
				parentView.Zoom = newZoom;
			} 
			else
 			{ 
				//scroll up and down 
 				int numberOfLogicalLines = -eventArgs.Delta / 120;
 				int logicalLineHeight = parentView.VScrollBar.SmallChange; 
				Point scrollPosition = parentView.ScrollPosition;

 				scrollPosition.Y = scrollPosition.Y + (numberOfLogicalLines * logicalLineHeight);
				parentView.ScrollPosition = scrollPosition; 
			}
		} 
 		#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.Collections.Generic; 
    using System.Collections.ObjectModel; 
    using System.Windows.Forms;
	using System.ComponentModel; 
 	using System.ComponentModel.Design;

	#region Class WindowManager
 	//This behavior needs the logical coordinates 
 	internal sealed class WindowManager : WorkflowDesignerMessageFilter
	{ 
 		#region Members and Constructor 
		private ActivityDesigner currentActiveDesigner = null;
 
		internal WindowManager()
		{
 		}
		#endregion 

 		#region MessageFilter Overrides 
 		protected override bool OnMouseDown(MouseEventArgs eventArgs) 
		{
 			Point clientPoint = new Point(eventArgs.X, eventArgs.Y); 

			//If the point is not in clickable area then return
			WorkflowView parentView = ParentView;
			if (!parentView.IsClientPointInActiveLayout(clientPoint)) 
 				return true;
 
			//Check if the mouse is hit on designer 
 			object selectedObject = null;
 			HitTestInfo hitTestInfo = MessageHitTestContext; 
			if (hitTestInfo == HitTestInfo.Nowhere)
 				selectedObject = parentView.RootDesigner.Activity;
			else
				selectedObject = hitTestInfo.SelectableObject; 

            //Selection service handles KeyModifiers, ctrl and shift will be handled as per the standard behavior 
			if (selectedObject != null) 
 			{
				ISelectionService selectionService = GetService(typeof(ISelectionService)) as ISelectionService; 
 				if (selectionService != null)
 					selectionService.SetSelectedComponents(new object[] { selectedObject }, SelectionTypes.Primary);
			}
 
 			//Designer designates an area as action area if there is some special significance associated with the area ie Expand Collapse
			//In such cases we give activity designer an oppertunity to take action when mouse click happens on the area 
			//if there are Ctrl or Shift keys pressed, only do the selection change, dont call the child designer 
			//Now that the designer is selected
 			if (this.currentActiveDesigner != hitTestInfo.AssociatedDesigner) 
            {
                if (this.currentActiveDesigner != null)
                    ((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseLeave();
 
				this.currentActiveDesigner = hitTestInfo.AssociatedDesigner;
 
                if (this.currentActiveDesigner != null) 
 					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseEnter(eventArgs);
            } 

            if (this.currentActiveDesigner != null && ((Control.ModifierKeys & (Keys.Control | Keys.Shift)) == 0))
 				((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseDown(eventArgs);
 
			return false;
 		} 
 
		protected override bool OnMouseMove(MouseEventArgs eventArgs)
		{ 
			Point clientPoint = new Point(eventArgs.X, eventArgs.Y);

 			//If the mouse is not in a valid area then we return
			if (!ParentView.IsClientPointInActiveLayout(clientPoint)) 
 			{
 				if (this.currentActiveDesigner != null) 
					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseLeave(); 
 				this.currentActiveDesigner = null;
				return true; 
			}

			//Now check which designer is hit
 			HitTestInfo hitTestInfo = MessageHitTestContext; 
			if (this.currentActiveDesigner != hitTestInfo.AssociatedDesigner)
            { 
 				if (this.currentActiveDesigner != null) 
 					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseLeave();
 
				this.currentActiveDesigner = hitTestInfo.AssociatedDesigner;

                if (this.currentActiveDesigner != null)
 					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseEnter(eventArgs); 
			}
			else 
			{ 
 				if (this.currentActiveDesigner != null)
					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseMove(eventArgs); 
 			}

 			return false;
		} 

 		protected override bool OnMouseUp(MouseEventArgs eventArgs) 
		{ 
			Point clientPoint = new Point(eventArgs.X, eventArgs.Y);
 
			//If the mouse is not in a valid area then we return
 			if (!ParentView.IsClientPointInActiveLayout(clientPoint))
			{
 				if (this.currentActiveDesigner != null) 
 					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseLeave();
				this.currentActiveDesigner = null; 
 				return true; 
			}
 
			//Now check which designer is hit
			HitTestInfo hitTestInfo = MessageHitTestContext;
 			if (this.currentActiveDesigner != hitTestInfo.AssociatedDesigner)
            { 
				if (this.currentActiveDesigner != null)
 					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseLeave(); 
 
 				this.currentActiveDesigner = hitTestInfo.AssociatedDesigner;
 
                if (this.currentActiveDesigner != null)
					((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseEnter(eventArgs);
 			}
 
			//Dispatch the event
			if (this.currentActiveDesigner != null) 
				((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseUp(eventArgs); 

 			return false; 
		}

 		protected override bool OnMouseDoubleClick(MouseEventArgs eventArgs)
 		{ 
			ISelectionService selectionService = GetService(typeof(ISelectionService)) as ISelectionService;
 			if (selectionService != null) 
			{ 
				ArrayList selectedComponents = new ArrayList(selectionService.GetSelectedComponents());
				for (int i = 0; i < selectedComponents.Count; i++) 
 				{
                    Activity selectedComponent = selectedComponents[i] as Activity;
                    if (selectedComponent == null)
						continue; 

 					IDesigner designer = ActivityDesigner.GetDesigner(selectedComponent) as IDesigner; 
 					if (designer != null) 
					{
 						designer.DoDefaultAction(); 
						((IWorkflowDesignerMessageSink)designer).OnMouseDoubleClick(eventArgs);
						break;
					}
 				} 
			}
 
 			return false; 
 		}
 
		protected override bool OnMouseEnter(MouseEventArgs eventArgs)
 		{
			//Fire the event
			if (this.currentActiveDesigner != null) 
				((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseEnter(eventArgs);
 
 			return false; 
		}
 
 		protected override bool OnMouseHover(MouseEventArgs eventArgs)
 		{
			//Fire the event
 			if (this.currentActiveDesigner != null) 
				((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseHover(eventArgs);
 
			return false; 
		}
 
 		protected override bool OnMouseLeave()
		{
 			//Dispatch events
 			if (this.currentActiveDesigner != null) 
			{
 				((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseLeave(); 
				this.currentActiveDesigner = null; 
			}
 
			return false;
 		}

		protected override bool OnMouseWheel(MouseEventArgs eventArgs) 
 		{
 			UpdateViewOnMouseWheel(eventArgs, Control.ModifierKeys); 
			return true; 
 		}
 
		protected override bool OnMouseCaptureChanged()
		{
			//Dispatch events
 			if (this.currentActiveDesigner != null) 
			{
 				((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseCaptureChanged(); 
 			} 

			return false; 
 		}

		protected override bool OnDragEnter(DragEventArgs eventArgs)
		{ 
			if (this.currentActiveDesigner != null)
 			{ 
				((IWorkflowDesignerMessageSink)this.currentActiveDesigner).OnMouseLeave(); 
 				this.currentActiveDesigner = null;
 			} 

			return false;
 		}
 
		protected override bool OnKeyDown(KeyEventArgs eventArgs)
		{ 
			if (eventArgs != null && (eventArgs.KeyCode == Keys.PageUp || eventArgs.KeyCode == Keys.PageDown)) 
 				UpdateViewOnPageUpDown(eventArgs.KeyCode == Keys.PageUp);
			ISelectionService selectionService = ((IServiceProvider)this.ParentView).GetService(typeof(ISelectionService)) as ISelectionService; 

 			//enter key (
 			if (eventArgs.KeyCode == Keys.Enter)
			{ 
 				// on enter key we want to do DoDefault of the designer
				IDesigner designer = ActivityDesigner.GetDesigner(selectionService.PrimarySelection as Activity) as IDesigner; 
				if (designer != null) 
				{
 					designer.DoDefaultAction(); 
					eventArgs.Handled = true;
 				}
 			}
			else if (eventArgs.KeyCode == Keys.Escape) 
 			{
				if (!eventArgs.Handled) 
				{ 
					CompositeActivityDesigner parentDesigner = ActivityDesigner.GetParentDesigner(selectionService.PrimarySelection);
 					if (parentDesigner != null) 
						selectionService.SetSelectedComponents(new object[] { parentDesigner.Activity }, SelectionTypes.Replace);

 					eventArgs.Handled = true;
 				} 
			}
            else if (eventArgs.KeyCode == Keys.Delete) 
            { 
                // check if we are cutting root component
                IDesignerHost designerHost = ((IServiceProvider)this.ParentView).GetService(typeof(IDesignerHost)) as IDesignerHost; 
                if (!(designerHost == null || selectionService.GetComponentSelected(designerHost.RootComponent)))
                {
                    //Check that we are cutting all activities
                    //Check if we are in writable context 
                    ICollection components = selectionService.GetSelectedComponents();
                    if (DesignerHelpers.AreComponentsRemovable(components)) 
                    { 
                        // check if we can delete these
                        List topLevelActivities = new List(Helpers.GetTopLevelActivities(selectionService.GetSelectedComponents())); 
                        bool needToDelete = (topLevelActivities.Count > 0);
                        IDictionary commonParentActivities = Helpers.PairUpCommonParentActivities(topLevelActivities);
                        foreach (DictionaryEntry entry in commonParentActivities)
                        { 
                            CompositeActivityDesigner compositeActivityDesigner = ActivityDesigner.GetDesigner(entry.Key as Activity) as CompositeActivityDesigner;
                            if (compositeActivityDesigner != null && !compositeActivityDesigner.CanRemoveActivities(new List((Activity[])((ArrayList)entry.Value).ToArray(typeof(Activity))).AsReadOnly())) 
                                needToDelete = false; 
                        }
 
                        if (needToDelete)
                        {
                            List connectors = new List();
                            foreach (object component in components) 
                            {
                                ConnectorHitTestInfo connector = component as ConnectorHitTestInfo; 
                                if (connector != null) 
                                    connectors.Add(connector);
                            } 

                            //cache selcted connectors before calling this func
                            CompositeActivityDesigner.RemoveActivities((IServiceProvider)this.ParentView, topLevelActivities.AsReadOnly(), SR.GetString(SR.DeletingActivities));
 
                            //add connectors back to the selection service
                            if (selectionService != null && connectors.Count > 0) 
                                selectionService.SetSelectedComponents(connectors, SelectionTypes.Add); 

                            eventArgs.Handled = true; 
                        }
                    }
                }
            } 
 			//navigation (left, right, up, down, tab, shift-tab)
			else if (eventArgs.KeyCode == Keys.Left || eventArgs.KeyCode == Keys.Right || eventArgs.KeyCode == Keys.Up || eventArgs.KeyCode == Keys.Down || eventArgs.KeyCode == Keys.Tab) 
			{ 
				//we'll pass it to the parent designer of the primary selected designer
 				//sequential designers just navigate between their children 
				//free form designers may move their children on arrow keys and navigate on tab
 				ActivityDesigner designer = ActivityDesigner.GetDesigner(selectionService.PrimarySelection as Activity) as ActivityDesigner;
 				if (designer != null && designer.ParentDesigner != null)
				{ 
 					//we will let the parent see if it wants to handle the event,
					//otherwise the selected designer itself will be called from a designer message filter below 
					((IWorkflowDesignerMessageSink)designer.ParentDesigner).OnKeyDown(eventArgs); 
					eventArgs.Handled = true;
 				} 
			}

 			if (!eventArgs.Handled)
 			{ 
				ActivityDesigner designerWithFocus = GetDesignerWithFocus();
 				if (designerWithFocus != null) 
					((IWorkflowDesignerMessageSink)designerWithFocus).OnKeyDown(eventArgs); 
			}
 
			return eventArgs.Handled;
 		}

		protected override bool OnKeyUp(KeyEventArgs eventArgs) 
 		{
 			ActivityDesigner designerWithFocus = GetDesignerWithFocus(); 
			if (designerWithFocus != null) 
 				((IWorkflowDesignerMessageSink)designerWithFocus).OnKeyUp(eventArgs);
 
			return false;
		}

        protected override bool OnScroll(ScrollBar sender, int value) 
        {
            ActivityDesigner designerWithFocus = GetDesignerWithFocus(); 
            if (designerWithFocus != null) 
                ((IWorkflowDesignerMessageSink)designerWithFocus).OnScroll(sender, value);
 
            return false;
        }

		protected override bool OnShowContextMenu(Point screenMenuPoint) 
 		{
			IMenuCommandService menuCommandService = GetService(typeof(IMenuCommandService)) as IMenuCommandService; 
 			if (menuCommandService != null) 
 				menuCommandService.ShowContextMenu(WorkflowMenuCommands.SelectionMenu, screenMenuPoint.X, screenMenuPoint.Y);
			return true; 
 		}

		protected override void OnLayout(LayoutEventArgs eventArgs)
		{ 
			WorkflowView parentView = ParentView;
 			using (Graphics graphics = parentView.CreateGraphics()) 
			{ 
 				if (parentView.RootDesigner != null)
 				{ 
					try
 					{
						((IWorkflowDesignerMessageSink)parentView.RootDesigner).OnLayoutSize(graphics);
					} 
					catch (Exception e)
 					{ 
						//Eat the exception thrown 
 						Debug.WriteLine(e);
 					} 

					try
 					{
						((IWorkflowDesignerMessageSink)parentView.RootDesigner).OnLayoutPosition(graphics); 
					}
					catch (Exception e) 
 					{ 
						//Eat the exception thrown
 						Debug.WriteLine(e); 
 					}
				}
 			}
		} 

		protected override bool ProcessMessage(Message message) 
		{ 
 			ActivityDesigner designerWithFocus = GetDesignerWithFocus();
			if (designerWithFocus != null) 
 				((IWorkflowDesignerMessageSink)designerWithFocus).ProcessMessage(message);

 			return false;
		} 

 		protected override void OnThemeChange() 
		{ 
			WorkflowView parentView = ParentView;
			if (parentView.RootDesigner != null) 
 				((IWorkflowDesignerMessageSink)parentView.RootDesigner).OnThemeChange();
		}
 		#endregion
 
 		#region Helpers
		private ActivityDesigner GetDesignerWithFocus() 
 		{ 
			ActivityDesigner designerWithFocus = null;
 
			ISelectionService selectionService = GetService(typeof(ISelectionService)) as ISelectionService;
			if (selectionService != null)
 			{
				object primarySelection = selectionService.PrimarySelection; 
 				if (primarySelection is Activity)
 					designerWithFocus = ActivityDesigner.GetDesigner(primarySelection as Activity); 
				else 
 					designerWithFocus = ActivityDesigner.GetParentDesigner(primarySelection);
			} 

			return designerWithFocus;
		}
 
 		private void UpdateViewOnPageUpDown(bool pageUp)
		{ 
 			WorkflowView parentView = ParentView; 
 			Point scrollPosition = parentView.ScrollPosition;
			scrollPosition.Y = scrollPosition.Y + ((pageUp ? -1 : 1) * parentView.VScrollBar.LargeChange); 
 			parentView.ScrollPosition = scrollPosition;
		}

		private void UpdateViewOnMouseWheel(MouseEventArgs eventArgs, Keys modifierKeys) 
		{
 			WorkflowView parentView = ParentView; 
			if (Control.ModifierKeys == Keys.Control) 
 			{
 				int newZoom = parentView.Zoom + ((eventArgs.Delta / 120) * 10); 
				newZoom = Math.Max(newZoom, AmbientTheme.MinZoom);
 				newZoom = Math.Min(newZoom, AmbientTheme.MaxZoom);
				parentView.Zoom = newZoom;
			} 
			else
 			{ 
				//scroll up and down 
 				int numberOfLogicalLines = -eventArgs.Delta / 120;
 				int logicalLineHeight = parentView.VScrollBar.SmallChange; 
				Point scrollPosition = parentView.ScrollPosition;

 				scrollPosition.Y = scrollPosition.Y + (numberOfLogicalLines * logicalLineHeight);
				parentView.ScrollPosition = scrollPosition; 
			}
		} 
 		#endregion 
	}
 	#endregion 
}

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

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK