mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/ShowExpandedMultiValueConverter.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation
   6 {
   7     using System.Diagnostics;
   8     using System.Diagnostics.CodeAnalysis;
   9     using System.Globalization;
  10     using System.Windows.Data;
  11     using System.Activities.Presentation.Model;
  12     using System.Activities.Presentation.Internal.PropertyEditing.Model;
  13     using System.Windows;
  14     using System.Activities.Presentation.View;
  15     using System.Runtime;
  16
  17     [SuppressMessage(FxCop.Category.Naming, FxCop.Rule.IdentifiersShouldBeSpelledCorrectly,
  18         Justification = "Following the naming of IMultiValueConverter")]
  19     internal sealed class ShowExpandedMultiValueConverter : IMultiValueConverter
  20     {
  21
  22         //Calculates whether ShowExpanded for a given WorklfowViewElement should be true or false.
  23         public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
  24         {
  25             ModelItem modelItem = (ModelItem)values[0];
  26             bool isRootDesigner = (bool)values[1];
  27             bool shouldExpandAll = (bool)values[2];
  28             bool shouldCollapseAll = (bool)values[3];
  29             bool expandState = (bool)values[4];
  30             bool pinState = (bool)values[5];
  31             WorkflowViewElement viewElement = (WorkflowViewElement)values[6];
  32
  33             //Pinstate should be false in following cases (Designer should be unpinned in following cases):
  34             //1. ExpandAll is not enabled.
  35             //2. ExpandAll is enabled and ExpandState is true.
  36             //Similarly for Collapse All.
  37             if ((!shouldExpandAll || expandState)
  38                 && (!shouldCollapseAll || !expandState))
  39             {
  40                 viewElement.PinState = false;
  41             }
  42             if (viewElement.IsAncestorOfRootDesigner)
  43             {
  44                 return true;
  45             }
  46             return ViewUtilities.ShouldShowExpanded(isRootDesigner, viewElement.DoesParentAlwaysExpandChild(),
  47                 viewElement.DoesParentAlwaysCollapseChildren(), expandState, shouldExpandAll, shouldCollapseAll, viewElement.PinState);
  48         }
  49
  50         public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
  51         {
  52             throw FxTrace.Exception.AsError(new NotSupportedException());
  53         }
  54
  55     }
  56 }