mcs/class/referencesource/System.Activities.Presentation/System.Activities.Core.Presentation/System/Activities/Core/Presentation/FlowchartExpressionAdorner.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Core.Presentation
   6 {
   7     using System.Activities.Presentation;
   8     using System.Activities.Presentation.Model;
   9     using System.Activities.Presentation.View;
  10     using System.Runtime;
  11     using System.Windows;
  12     using System.Windows.Controls;
  13     using System.Windows.Documents;
  14     using System.Windows.Media;
  15     using System.Windows.Media.Effects;
  16
  17     class FlowchartExpressionAdorner : Adorner
  18     {
  19         string expressionString;
  20         bool isTextRightToLeft;
  21
  22         public FlowchartExpressionAdorner(UIElement adornedElement)
  23             : base(adornedElement)
  24         {
  25             expressionString = GetExpressionString();
  26             this.isTextRightToLeft = FreeFormPanelUtilities.IsRightToLeft(adornedElement);
  27         }
  28
  29         protected override void OnRender(DrawingContext drawingContext)
  30         {
  31             Transform transform = isTextRightToLeft ? new MatrixTransform(-1, 0, 0, 1, 0, 0) : Transform.Identity;
  32             Border tooltip = new Border
  33             {
  34                 Background = new SolidColorBrush(Colors.White),
  35                 BorderBrush = new SolidColorBrush(WorkflowDesignerColors.WorkflowViewElementBorderColor),
  36                 BorderThickness = new Thickness(1),
  37                 CornerRadius = new CornerRadius(4),
  38                 Margin = new Thickness(10),
  39                 Child = new TextBlock
  40                 {
  41                     Margin = new Thickness(4, 0, 4, 0),
  42                     MaxHeight = 100,
  43                     Text = expressionString,
  44                 },
  45                 Effect = new DropShadowEffect
  46                 {
  47                     Color = Colors.Black,
  48                     BlurRadius = 4,
  49                     Opacity = 0.5
  50                 },
  51                 RenderTransform = transform
  52             };
  53             tooltip.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
  54
  55             VisualBrush brush = new VisualBrush()
  56             {
  57                 Visual = tooltip
  58             };
  59
  60             Rect adornedElementRect = new Rect(this.AdornedElement.DesiredSize);
  61             Rect tooltipRect = new Rect(adornedElementRect.TopLeft + new Vector(adornedElementRect.Width, -tooltip.DesiredSize.Height), tooltip.DesiredSize);
  62             Pen renderPen = new Pen();
  63             drawingContext.DrawRectangle(brush, renderPen, tooltipRect);
  64         }
  65
  66         public static string GetExpressionString(UIElement adornedElement)
  67         {
  68             string expressionPropertyName;
  69             ModelItem modelItem;
  70             if (adornedElement is FlowDecisionDesigner)
  71             {
  72                 expressionPropertyName = "Condition";
  73                 modelItem = ((FlowDecisionDesigner)adornedElement).ModelItem;
  74             }
  75             else
  76             {
  77                 Fx.Assert(adornedElement is FlowSwitchDesigner, "this.AdornedElement is either FlowDecisionDesigner or FlowSwitchDesigner");
  78                 expressionPropertyName = "Expression";
  79                 modelItem = ((FlowSwitchDesigner)adornedElement).ModelItem;
  80             }
  81             Activity expressionActivity = modelItem.Properties[expressionPropertyName].ComputedValue as Activity;
  82             return ExpressionHelper.GetExpressionString(expressionActivity, modelItem);
  83         }
  84
  85         string GetExpressionString()
  86         {
  87             return GetExpressionString(this.AdornedElement);
  88         }
  89     }
  90 }