Point Hit Test with VisualTreeHelper.HitTest : UI Element « Windows Presentation Foundation « VB.Net Tutorial

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VB.Net Tutorial » Windows Presentation Foundation » UI Element 
16.50.14.Point Hit Test with VisualTreeHelper.HitTest
<StackPanel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
  xmlns:d="http://schemas.microsoft.com/expression/interactivedesigner/2006"
  mc:Ignorable="d"
  x:Class="InputExamples.PointHitTest" 
  Width="640" Height="480">

  <StackPanel.Resources>
    <Storyboard x:Key="OnLoaded"/>
  </StackPanel.Resources>
  <StackPanel.Triggers>
    <EventTrigger RoutedEvent="FrameworkElement.Loaded">
      <BeginStoryboard x:Name="OnLoaded_BeginStoryboard" Storyboard="{DynamicResource OnLoaded}"/>
    </EventTrigger>
  </StackPanel.Triggers>
  <Rectangle Fill="Red" Margin="20" Width="200" Height="200" x:Name="RectangleArea"/>
</StackPanel>
//File:Window.xaml.vb

Imports System
Imports System.IO
Imports System.Net
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Data
Imports System.Windows.Input
Imports System.Windows.Media
Imports System.Windows.Media.Animation
Imports System.Windows.Navigation

Namespace InputExamples
  Public Partial Class PointHitTest
    Public Sub New()
      Me.InitializeComponent()
    End Sub

    Protected Overrides Sub OnInitialized(As EventArgs)
      MyBase.OnInitialized(e)
      AddHandler CompositionTarget.Rendering, AddressOf Me.CompositionTarget_Rendering
    End Sub

    Private Sub CompositionTarget_Rendering(sender As Object, e As EventArgs)
      Dim position As Point = Mouse.GetPosition(RectangleArea)
      VisualTreeHelper.HitTest(RectangleArea, Nothing, New HitTestResultCallback(AddressOf HitTestResultHandler), New PointHitTestParameters(position))
    End Sub

    Public Function HitTestResultHandler(result As HitTestResultAs HitTestResultBehavior
      Dim hitResult As PointHitTestResult = DirectCast(result, PointHitTestResult)
      Console.WriteLine(DirectCast(hitResult.VisualHit, FrameworkElement).Name)
      Console.WriteLine(hitResult.PointHit.ToString())
      Return HitTestResultBehavior.[Continue]
    End Function
  End Class
End Namespace
WPF Point Hit Test With Visual Tree Helper Hit Test
16.50.UI Element
16.50.1.Find enclosure componentFind enclosure component
16.50.2.Clear locally set values and restore the default values of dependency propertiesClear locally set values and restore the default values of dependency properties
16.50.3.PresentationTraceSources.SetTraceLevel(binding,PresentationTraceLevel.High);PresentationTraceSources.SetTraceLevel(binding,PresentationTraceLevel.High);
16.50.4.UI Element Mouse Clicked EventsUI Element Mouse Clicked Events
16.50.5.Programmatically Extract an Element's Style with DefaultStyleKeyPropertyProgrammatically Extract an Element's Style with DefaultStyleKeyProperty
16.50.6.Print Logical TreePrint Logical Tree
16.50.7.Print Visual TreePrint Visual Tree
16.50.8.About Dialog with Tree WalkingAbout Dialog with Tree Walking
16.50.9.Changing graphical elementsChanging graphical elements
16.50.10.UIElement CountUIElement Count
16.50.11.Use Linq to get control from a containerUse Linq to get control from a container
16.50.12.Find inner visual elementFind inner visual element
16.50.13.Logical Visual Tree SampleLogical Visual Tree Sample
16.50.14.Point Hit Test with VisualTreeHelper.HitTestPoint Hit Test with VisualTreeHelper.HitTest
16.50.15.Change the Visibility property of a UIElement.Change the Visibility property of a UIElement.
16.50.16.Mixing graphics with Control ElementsMixing graphics with Control Elements
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