mcs/class/referencesource/System.Activities.Presentation/System.Activities.Core.Presentation/System/Activities/Core/Presentation/FlowchartConnectionPointsAdorner.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.FreeFormEditing;
   9     using System.Activities.Presentation.View;
  10     using System.Collections.Generic;
  11     using System.Diagnostics;
  12     using System.Windows;
  13     using System.Windows.Documents;
  14     using System.Windows.Input;
  15     using System.Windows.Media;
  16     using System.Runtime;
  17
  18     internal class FlowchartConnectionPointsAdorner : ConnectionPointsAdorner
  19     {
  20         private bool isTextRightToLeft;
  21
  22         public FlowchartConnectionPointsAdorner(UIElement adornedElement, List<ConnectionPoint> connectionPointsToShow, bool isParentShapeSelected, bool isTextRightToLeft)
  23             : base(adornedElement, connectionPointsToShow, isParentShapeSelected)
  24         {
  25             this.isTextRightToLeft = isTextRightToLeft;
  26             this.FlowDirection = isTextRightToLeft ? FlowDirection.RightToLeft : FlowDirection.LeftToRight;
  27         }
  28
  29         protected override void OnRender(DrawingContext drawingContext)
  30         {
  31             const int textCulture = 9;
  32
  33             ConnectionPoint trueConnectionPoint = null;
  34             ConnectionPoint falseConnectionPoint = null;
  35
  36             if (this.connectionPoints.Contains(FlowchartDesigner.GetTrueConnectionPoint(this.AdornedElement)))
  37             {
  38                 trueConnectionPoint = FlowchartDesigner.GetTrueConnectionPoint(this.AdornedElement);
  39             }
  40             if (this.connectionPoints.Contains(FlowchartDesigner.GetFalseConnectionPoint(this.AdornedElement)))
  41             {
  42                 falseConnectionPoint = FlowchartDesigner.GetFalseConnectionPoint(this.AdornedElement);
  43             }
  44             Point actualPoint;
  45             Point origin = FreeFormPanel.GetLocation(AdornedElement);
  46             Thickness margin = ((FrameworkElement)AdornedElement).Margin;
  47             origin.X += margin.Left;
  48             origin.Y += margin.Top;
  49
  50             foreach (ConnectionPoint connPoint in this.connectionPoints)
  51             {
  52                 actualPoint = new Point(connPoint.Location.X - origin.X, connPoint.Location.Y - origin.Y);
  53                 this.DrawConnectionPoint(connPoint, actualPoint, drawingContext);
  54             }
  55
  56             if (trueConnectionPoint != null)
  57             {
  58                 string trueLabelText = String.Empty;
  59
  60                 VirtualizedContainerService.VirtualizingContainer virtualizingContainer = (VirtualizedContainerService.VirtualizingContainer)trueConnectionPoint.ParentDesigner;
  61                 if (virtualizingContainer != null && virtualizingContainer.ModelItem != null)
  62                 {
  63                     trueLabelText = (string)virtualizingContainer.ModelItem.Properties["TrueLabel"].ComputedValue;
  64                 }
  65
  66                 actualPoint = new Point(trueConnectionPoint.Location.X - origin.X, trueConnectionPoint.Location.Y - origin.Y);
  67                 FormattedText trueMarkerFormattedText = new FormattedText(trueLabelText, new System.Globalization.CultureInfo(textCulture),
  68                     this.FlowDirection, FlowchartDesigner.FlowElementCaptionTypeface, FlowchartDesigner.FlowNodeCaptionFontSize,
  69                     new SolidColorBrush(WorkflowDesignerColors.WorkflowViewElementCaptionColor));
  70                 actualPoint.Y += ConnectionPoint.DrawingLargeSide / 2;
  71                 actualPoint.X -= trueMarkerFormattedText.WidthIncludingTrailingWhitespace;
  72
  73                 DrawtWithTransform(
  74                     drawingContext,
  75                     this.isTextRightToLeft,
  76                     // Mirror the left side text to the right side by using this axis when RTL.
  77                     actualPoint.X,
  78                     () =>
  79                     {
  80                         drawingContext.DrawText(trueMarkerFormattedText, actualPoint);
  81                     });
  82
  83             }
  84             if (falseConnectionPoint != null)
  85             {
  86                 string falseLabelText = String.Empty;
  87
  88                 VirtualizedContainerService.VirtualizingContainer virtualizingContainer = (VirtualizedContainerService.VirtualizingContainer)falseConnectionPoint.ParentDesigner;
  89                 if (virtualizingContainer != null && virtualizingContainer.ModelItem != null)
  90                 {
  91                     falseLabelText = (string)virtualizingContainer.ModelItem.Properties["FalseLabel"].ComputedValue;
  92                 }
  93
  94                 actualPoint = new Point(falseConnectionPoint.Location.X - origin.X, falseConnectionPoint.Location.Y - origin.Y);
  95                 actualPoint.Y += ConnectionPoint.DrawingLargeSide / 2;
  96
  97                 FormattedText falseMarkerFormattedText = new FormattedText(falseLabelText, new System.Globalization.CultureInfo(textCulture),
  98                     this.FlowDirection, FlowchartDesigner.FlowElementCaptionTypeface, FlowchartDesigner.FlowNodeCaptionFontSize,
  99                     new SolidColorBrush(WorkflowDesignerColors.WorkflowViewElementCaptionColor));
 100
 101                 DrawtWithTransform(
 102                     drawingContext,
 103                     this.isTextRightToLeft,
 104                     // Mirror the left side text to the right side by using this axis when RTL.
 105                     actualPoint.X,
 106                     () =>
 107                     {
 108                         drawingContext.DrawText(falseMarkerFormattedText, actualPoint);
 109                     });
 110             }
 111
 112             base.OnRender(drawingContext);
 113         }
 114
 115         private static void DrawtWithTransform(DrawingContext drawingContext, bool isRightToLeft, double axis, Action doDraw)
 116         {
 117             if (isRightToLeft)
 118             {
 119                 /* We hope to mirror the Text using yAxis as axis, like from (a) to (b)
 120                  * |                                 |
 121                  * |    ==>= =>==>                   |     <==<= =<==
 122                  * |--------|------> x               |----------|--------> x
 123                  * y       axis    (a)              y           axis      (b)
 124                  *
 125                  * So we do it in three steps:
 126                  * 1) move text so that axis and y are coincident
 127                  * |                                            |
 128                  * |    ==>= =>==>                          ==>=|=>==>
 129                  * |--------|------> x                ----------|---------> x
 130                  * y       axis                                y(axis)
 131                  *
 132                  * 2) mirror
 133                  *         |                                   |
 134                  *     ==>=|=>==>                          <=<=|=<==
 135                  * --------|------> x                ----------|---------> x
 136                  *       y(axis)                              y(axis)
 137                  *
 138                  * 3) move back
 139                  *         |                         |
 140                  *     <=<=|=<==                     |     <=<= =<==
 141                  * --------|------> x                |---------|----------> x
 142                  *         y                         y        axis
 143                  *
 144                  *
 145                  *              |  1   0   0 |   | -1 0 0 |   |   1    0   0 |   |  -1     0    0 |
 146                  *  transform = |  0   1   0 | x |  0 1 0 | x |   0    1   0 | = |   0     1    0 |
 147                  *              | axis 0   1 |   |  0 0 1 |   | -axis  0   0 |   | 2*axis  0    1 |
 148                  */
 149
 150                 MatrixTransform transform = new MatrixTransform(-1, 0, 0, 1, 2 * axis, 0);
 151                 drawingContext.PushTransform(transform);
 152                 doDraw();
 153                 drawingContext.Pop();
 154             }
 155             else
 156             {
 157                 doDraw();
 158             }
 159         }
 160     }
 161 }