mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/View/SearchToolTipAdorner.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation.View
   6 {
   7     using System.Activities.Presentation;
   8     using System.Windows;
   9     using System.Windows.Controls;
  10     using System.Windows.Documents;
  11     using System.Windows.Media;
  12     using System.Windows.Media.Effects;
  13
  14     class SearchToolTipAdorner : Adorner
  15     {
  16         Border tooltip;
  17         double scrollViewerToScreenDistance;
  18         public SearchToolTipAdorner(UIElement adornedElement, DesignerView designerView, string text)
  19             : base(adornedElement)
  20         {
  21             this.scrollViewerToScreenDistance = designerView.ScrollViewer.PointToScreen(new Point(0, 0)).Y;;
  22             tooltip = new Border
  23             {
  24                 Background = new SolidColorBrush(WorkflowDesignerColors.DesignerViewBackgroundColor),
  25                 BorderBrush = new SolidColorBrush(WorkflowDesignerColors.WorkflowViewElementBorderColor),
  26                 BorderThickness = new Thickness(1),
  27                 CornerRadius = new CornerRadius(4),
  28                 Margin = new Thickness(10),
  29                 Child = new TextBlock
  30                 {
  31                     Foreground = new SolidColorBrush(WorkflowDesignerColors.WorkflowViewElementCaptionColor),
  32                     Margin = new Thickness(4, 0, 4, 0),
  33                     MaxWidth = 300,
  34                     Text = text,
  35                     TextWrapping = TextWrapping.Wrap,
  36                     TextTrimming = TextTrimming.CharacterEllipsis
  37                 },
  38                 Effect = new DropShadowEffect
  39                 {
  40                     Color = Colors.Black,
  41                     BlurRadius = 4,
  42                     Opacity = 0.5
  43                 },
  44             };
  45             tooltip.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
  46         }
  47
  48         protected override void OnRender(DrawingContext drawingContext)
  49         {
  50             VisualBrush brush = new VisualBrush()
  51             {
  52                 Visual = tooltip
  53             };
  54
  55             double adornerElementToVisibleScrollViewDistance =
  56                 this.AdornedElement.PointToScreen(new Point(0, 0)).Y - this.scrollViewerToScreenDistance;
  57             double Y = adornerElementToVisibleScrollViewDistance < tooltip.DesiredSize.Height ?
  58                 tooltip.DesiredSize.Height :
  59                 -tooltip.DesiredSize.Height;
  60             Rect tooltipRect = new Rect(new Point(0, Y), tooltip.DesiredSize);
  61
  62             Pen renderPen = new Pen();
  63             drawingContext.DrawRectangle(brush, renderPen, tooltipRect);
  64         }
  65     }
  66 }