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

   1 //------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //------------------------------------------------------------
   4
   5
   6 namespace System.Activities.Presentation.FreeFormEditing
   7 {
   8     using System;
   9     using System.Globalization;
  10     using System.Windows;
  11     using System.Windows.Data;
  12     using System.Windows.Media;
  13     using System.Diagnostics.CodeAnalysis;
  14
  15     [SuppressMessage("Microsoft.Performance", "CA1812:AvoidUninstantiatedInternalClasses", Justification = "The class is used in xaml.")]
  16     class ConnectorPointsToArrowMarginConverter : IMultiValueConverter
  17     {
  18         [SuppressMessage("Microsoft.Design", "CA1062:Validate arguments of public methods", Justification = "The class is only used internally and not accessible externally.")]
  19         public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
  20         {
  21
  22             Thickness margin = new Thickness(0);
  23             PointCollection points = values[0] as PointCollection;
  24             RotateTransform transform = values[1] as RotateTransform;
  25             int offset = int.Parse(parameter.ToString(), CultureInfo.InvariantCulture);
  26             if (points != null && points.Count > 0)
  27             {
  28                 margin.Left = points[points.Count - 1].X - offset;
  29                 margin.Top = points[points.Count - 1].Y - offset;
  30             }
  31             if (transform != null)
  32             {
  33                 switch ((int)transform.Angle)
  34                 {
  35                     case 0:
  36                         margin.Left -= offset;
  37                         break;
  38                     case 90:
  39                         margin.Top -= offset;
  40                         break;
  41                     case 180:
  42                         margin.Left += offset;
  43                         break;
  44                     case 270:
  45                         margin.Top += offset;
  46                         break;
  47                 }
  48             }
  49             return margin;
  50         }
  51
  52         public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
  53         {
  54             throw FxTrace.Exception.AsError(new NotSupportedException());
  55         }
  56     }
  57 }