mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/FreeFormEditing/ConnectorStartDotConverter.cs

   1 //------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation.FreeFormEditing
   6 {
   7     using System;
   8     using System.Windows;
   9     using System.Windows.Data;
  10     using System.Diagnostics.CodeAnalysis;
  11
  12     [SuppressMessage("Microsoft.Performance", "CA1812:AvoidUninstantiatedInternalClasses", Justification = "The class is used in xaml.")]
  13     class ConnectorStartDotConverter : IValueConverter
  14     {
  15         const double Radius = 5.0;
  16         const double RadiusForHitTest = 10.0;
  17
  18         public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
  19         {
  20             Point point = (Point)value;
  21             bool[] parameters = (bool[])parameter;
  22             double radius = Radius;
  23             if (parameters[1])
  24             {
  25                 radius = RadiusForHitTest;
  26             }
  27             if (parameters[0]) // left point
  28             {
  29                 return new Point((point.X - radius), point.Y);
  30             }
  31             else // right point
  32             {
  33                 return new Point((point.X + radius), point.Y);
  34             }
  35         }
  36
  37         public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
  38         {
  39             throw FxTrace.Exception.AsError(new NotSupportedException());
  40         }
  41     }
  42 }