mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/FreeFormEditing/ConnectorLabelVisibilityConverter.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 in used in xaml.")]
  16     class ConnectorLabelVisibilityConverter : IMultiValueConverter
  17     {
  18
  19         [SuppressMessage("Microsoft.Design", "CA1062:Validate arguments of public methods", Justification = "The class is only used internally and not accessible externally.")]
  20         public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
  21         {
  22             Visibility connectorLabelVisibility = Visibility.Collapsed;
  23             string labelText = values[0] as string;
  24             PointCollection connectorPoints = values[1] as PointCollection;
  25             if (!String.IsNullOrEmpty(labelText) && connectorPoints != null)
  26             {
  27                 int maxSegmentStartPoint;
  28                 if (DesignerGeometryHelper.LongestSegmentLength(connectorPoints, out maxSegmentStartPoint) > Connector.MinConnectorSegmentLengthForLabel)
  29                 {
  30                     connectorLabelVisibility = Visibility.Visible;
  31                 }
  32             }
  33             return connectorLabelVisibility;
  34         }
  35
  36         public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
  37         {
  38             throw FxTrace.Exception.AsError(new NotSupportedException());
  39         }
  40
  41     }
  42 }