FlowchartDesigner.Helpers.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Core.Presentation / System / Activities / Core / Presentation / FlowchartDesigner.Helpers.cs / 1305376 / FlowchartDesigner.Helpers.cs
                        

                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.Activities.Core.Presentation 
{
    using System.Collections.Generic; 
    using System.Diagnostics; 
    using System.Windows;
    using System.Windows.Documents; 
    using System.Windows.Media;
    using System.Windows.Shapes;
    using System.Activities.Statements;
    using System.Activities.Presentation.Model; 
    using System.Linq;
    using System.Runtime; 
    using System.Globalization; 
    using System.Activities.Presentation;
 
    partial class FlowchartDesigner
    {
        //Returns true if visual is on the visual tree for point p relative to the panel.
        bool IsVisualHit(UIElement visual, UIElement reference, Point point) 
        {
            bool visualIsHit = false; 
            HitTestResult result = VisualTreeHelper.HitTest(reference, point); 
            if (result != null)
            { 
                DependencyObject obj = result.VisualHit;
                while (obj != null)
                {
                    if (visual.Equals(obj)) 
                    {
                        visualIsHit = true; 
                        break; 
                    }
                    obj = VisualTreeHelper.GetParent(obj); 
                }
            }
            return visualIsHit;
        } 

        internal void FindClosestConnectionPointPair(List srcConnPoints, List destConnPoints, out ConnectionPoint srcConnPoint, out ConnectionPoint destConnPoint) 
        { 
            double minDist = double.PositiveInfinity;
            double dist; 
            ConnectionPoint tempConnPoint;
            srcConnPoint = null;
            destConnPoint = null;
            foreach (ConnectionPoint connPoint in srcConnPoints) 
            {
                tempConnPoint = FindClosestConnectionPoint(connPoint, destConnPoints, out dist); 
                if (dist < minDist) 
                {
                    minDist = dist; 
                    srcConnPoint = connPoint;
                    destConnPoint = tempConnPoint;
                }
            } 
            Fx.Assert(srcConnPoint != null, "No ConnectionPoint found");
            Fx.Assert(destConnPoint != null, "No ConnectionPoint found"); 
        } 

        internal ConnectionPoint FindClosestConnectionPoint(ConnectionPoint srcConnPoint, List destConnPoints, out double minDist) 
        {
            return FindClosestConnectionPoint(srcConnPoint.Location, destConnPoints, out minDist);
        }
 
        internal ConnectionPoint FindClosestConnectionPoint(Point srcConnPointLocation, List destConnPoints, out double minDist)
        { 
            minDist = double.PositiveInfinity; 
            double dist = 0;
            ConnectionPoint closestPoint = null; 
            foreach (ConnectionPoint destConnPoint in destConnPoints)
            {
                dist = DesignerGeometryHelper.DistanceBetweenPoints(srcConnPointLocation, destConnPoint.Location);
                if (dist < minDist) 
                {
                    minDist = dist; 
                    closestPoint = destConnPoint; 
                }
            } 

            return closestPoint;
        }
 
        ConnectionPoint FindClosestConnectionPointNotOfType(ConnectionPoint srcConnectionPoint, List targetConnectionPoints, ConnectionPointType illegalConnectionPointType)
        { 
            double minDist; 
            List filteredConnectionPoints = new List();
            foreach (ConnectionPoint connPoint in targetConnectionPoints) 
            {
                if (connPoint.PointType != illegalConnectionPointType && !connPoint.Equals(srcConnectionPoint))
                {
                    filteredConnectionPoints.Add(connPoint); 
                }
            } 
            return FindClosestConnectionPoint(srcConnectionPoint, filteredConnectionPoints, out minDist); 
        }
 

        void RemoveAdorner(UIElement adornedElement, Type adornerType)
        {
            Fx.Assert(adornedElement != null, "Invalid argument"); 
            Fx.Assert(typeof(Adorner).IsAssignableFrom(adornerType), "Invalid argument");
            AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(adornedElement); 
            if (adornerLayer != null) 
            {
                Adorner[] adorners = adornerLayer.GetAdorners(adornedElement); 
                if (adorners != null)
                {
                    foreach (Adorner adorner in adorners)
                    { 
                        if (adornerType.IsAssignableFrom(adorner.GetType()))
                        { 
                            adornerLayer.Remove(adorner); 
                        }
                    } 
                }
            }
        }
 
        //Returns true if child is a member of the tree rooted at the parent;
        bool IsParentOf(ModelItem parent, ModelItem child) 
        { 
            Fx.Assert(parent != null, "Invalid argument");
            bool isParentOf = false; 
            while (child != null)
            {
                if (parent.Equals(child))
                { 
                    isParentOf = true;
                    break; 
                } 
                child = child.Parent;
            } 
            return isParentOf;
        }

        ConnectionPoint ConnectionPointHitTest(UIElement element, Point hitPoint) 
        {
            ConnectionPoint hitConnectionPoint = null; 
            List connectionPoints = new List(); 
            List defaultConnectionPoints = FlowchartDesigner.GetConnectionPoints(element);
            connectionPoints.InsertRange(0, defaultConnectionPoints); 
            connectionPoints.Add(FlowchartDesigner.GetTrueConnectionPoint(element));
            connectionPoints.Add(FlowchartDesigner.GetFalseConnectionPoint(element));
            foreach (ConnectionPoint connPoint in connectionPoints)
            { 
                if (connPoint != null)
                { 
                    // connPoint.Location is the point on the Edge. 
                    // hitPoint is the mouse pointer location.
                    // both Points are defined with respect to the coordinate system defined by the topLeft corner of the flowchart designer canvas. 
                    if (new Rect(connPoint.Location + connPoint.HitTestOffset, connPoint.HitTestSize).Contains(hitPoint))
                    {
                        hitConnectionPoint = connPoint;
                        break; 
                    }
                } 
            } 
            return hitConnectionPoint;
        } 

        internal int NumberOfIncomingLinks(UIElement designer)
        {
            return GetInComingConnectors(designer).Count; 
        }
 
        List GetAttachedConnectors(UIElement shape) 
        {
            HashSet attachedConnectors = new HashSet(); 
            List allConnectionPoints = GetAllConnectionPoints(shape);
            foreach (ConnectionPoint connPoint in allConnectionPoints)
            {
                if (connPoint != null) 
                {
                    foreach(Connector connector in connPoint.AttachedConnectors) 
                    { 
                        attachedConnectors.Add(connector);
                    } 
                }
            }
            return attachedConnectors.ToList();
        } 

        List GetOutGoingConnectors(UIElement shape) 
        { 
            List outGoingConnectors = new List();
            List allConnectionPoints = GetAllConnectionPoints(shape); 
            foreach (ConnectionPoint connPoint in allConnectionPoints)
            {
                if (connPoint != null)
                { 
                    outGoingConnectors.AddRange(connPoint.AttachedConnectors.Where(p => FreeFormPanel.GetSourceConnectionPoint(p).Equals(connPoint)));
                } 
            } 
            return outGoingConnectors;
        } 

        List GetInComingConnectors(UIElement shape)
        {
            List inComingConnectors = new List(); 
            List allConnectionPoints = GetAllConnectionPoints(shape);
            foreach (ConnectionPoint connPoint in allConnectionPoints) 
            { 
                if (connPoint != null)
                { 
                    inComingConnectors.AddRange(connPoint.AttachedConnectors.Where(p => FreeFormPanel.GetDestinationConnectionPoint(p).Equals(connPoint)));
                }
            }
            return inComingConnectors; 
        }
 
 

        List GetAllConnectionPoints(UIElement shape) 
        {
            List allConnectionPoints = new List(6);
            allConnectionPoints.AddRange(FlowchartDesigner.GetConnectionPoints(shape));
            allConnectionPoints.Add(FlowchartDesigner.GetTrueConnectionPoint(shape)); 
            allConnectionPoints.Add(FlowchartDesigner.GetFalseConnectionPoint(shape));
            return allConnectionPoints; 
        } 

        Point SnapPointToGrid(Point pt) 
        {
            pt.X -= pt.X % FlowchartDesigner.GridSize;
            pt.Y -= pt.Y % FlowchartDesigner.GridSize;
            pt.X = pt.X < 0 ? 0 : pt.X; 
            pt.Y = pt.Y < 0 ? 0 : pt.Y;
            return pt; 
        } 

        //This snaps the center of the element to grid. 
        //This is called only when dropping an item
        //Whereever, shapeAnchorPoint is valid, it is made co-incident with the drop location.
        Point SnapVisualToGrid(UIElement element, Point location, Point shapeAnchorPoint)
        { 
            Fx.Assert(element != null, "Input UIElement is null");
            element.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity)); 
            Point oldCenter = location; 
            if (shapeAnchorPoint.X < 0 && shapeAnchorPoint.Y < 0)
            { 
                //shapeAnchorPoint is set to (-1, -1) in case where it does not make sense (Eg. toolbox drop).
                //In that scenario align the center of the shape to the drop point.
                location.X -= element.DesiredSize.Width / 2;
                location.Y -= element.DesiredSize.Height / 2; 
            }
            else 
            { 
                //The else part also takes care of the ActivityDesigner case,
                //where the drag handle is outside the shape. 
                location.X -= shapeAnchorPoint.X;
                location.Y -= shapeAnchorPoint.Y;
                oldCenter = new Point(location.X + element.DesiredSize.Width / 2, location.Y + element.DesiredSize.Height / 2);
            } 

            Point newCenter = SnapPointToGrid(oldCenter); 
 
            location.Offset(newCenter.X - oldCenter.X, newCenter.Y - oldCenter.Y);
 
            if (location.X < 0)
            {
                double correction = FlowchartDesigner.GridSize - ((location.X * (-1)) % FlowchartDesigner.GridSize);
                location.X = (correction == FlowchartDesigner.GridSize) ? 0 : correction; 
            }
            if (location.Y < 0) 
            { 
                double correction = FlowchartDesigner.GridSize - ((location.Y * (-1)) % FlowchartDesigner.GridSize);
                location.Y = (correction == FlowchartDesigner.GridSize) ? 0 : correction; 
            }
            return location;
        }
 

        // This creates a link from modelItems[i] to modelItems[i+1] - foreach i between 0 and modelItems.Count-2; 
        void CreateLinks(List modelItems) 
        {
            Fx.Assert(modelItems.Count > 1, "Link creation requires more than one ModelItem"); 
            modelItems.ForEach(p => { Fx.Assert(this.modelElement.ContainsKey(p), "View should be in the flowchart"); });
            ModelItem[] modelItemsArray = modelItems.ToArray();
            string errorMessage = string.Empty;
            for (int i = 0; i < modelItemsArray.Length - 1; i++) 
            {
                string error = string.Empty; 
                CreateLinkGesture(this.modelElement[modelItemsArray[i]], this.modelElement[modelItemsArray[i + 1]], out error, null); 
                if (!string.Empty.Equals(error))
                { 
                    errorMessage += string.Format(CultureInfo.CurrentUICulture, "Link{0}:{1}\n", i + 1, error);
                }
            }
            if(!string.Empty.Equals(errorMessage)) 
            {
                ErrorReporting.ShowErrorMessage(errorMessage); 
            } 
        }
 
        // This is a utility function to pack all the elements in an array that match a particular predicate
        // to the end of the array, while maintaining the rest of the system unchanged.
        public static bool Pack(T[] toPack, Func isPacked) where T : class
        { 
            if (toPack == null)
            { 
                throw FxTrace.Exception.ArgumentNull("toPack"); 
            }
            if (isPacked == null) 
            {
                throw FxTrace.Exception.ArgumentNull("isPacked");
            }
            int count = toPack.Length; 
            bool needRearrange = false;
            bool found = false; 
            T[] arranged = new T[count]; 
            for (int i = 0; i < count; i++)
            { 
                if (isPacked(toPack[i]))
                {
                    arranged[i] = toPack[i];
                    toPack[i] = null; 
                    found = true;
                } 
                else 
                {
                    if (found) 
                    {
                        needRearrange = true;
                    }
                    arranged[i] = null; 
                }
            } 
            if (needRearrange) 
            {
                int j = 0; 
                for (int i = 0; i < count; i++)
                {
                    if (toPack[i] != null)
                    { 
                        toPack[j++] = toPack[i];
                    } 
                } 
                j = count;
                for (int i = 0; i < count; i++) 
                {
                    int k = count - i - 1;
                    if (arranged[k] != null)
                    { 
                        toPack[--j] = arranged[k];
                    } 
                } 
            }
            else 
            {
                for (int i = 0; i < count; i++)
                {
                    if (arranged[i] != null) 
                    {
                        toPack[i] = arranged[i]; 
                    } 
                }
            } 
            return needRearrange;
        }

    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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