Point Hit Test : Mouse « Windows Presentation Foundation « C# / C Sharp

1. C# / C Sharp
2. Windows Presentation Foundation
3. Mouse

Point Hit Test

  
<Window 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">

  <Window.Resources>
    <Storyboard x:Key="OnLoaded"/>
  </Window.Resources>

  <Window.Triggers>
    <EventTrigger RoutedEvent="FrameworkElement.Loaded">
      <BeginStoryboard x:Name="OnLoaded_BeginStoryboard" Storyboard="{DynamicResource OnLoaded}"/>
    </EventTrigger>
  </Window.Triggers>
    <StackPanel>   
  <Rectangle Fill="Red"  Width="200" Height="200" x:Name="RectangleArea"/>
  <Label d:LayoutOverrides="Height"  Width="Auto" Height="28" x:Name="HitLabel" Content="Label"/>
    </StackPanel>
</Window>
//File:Window.xaml.cs

using System;
using System.IO;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Navigation;

namespace InputExamples
{
  public partial class PointHitTest
  {
    private string hitStatus;
    
    public PointHitTest()
    {
      this.InitializeComponent();
    }
    
    protected override void OnInitialized(EventArgs e)
    {
      base.OnInitialized(e);
      
      CompositionTarget.Rendering += this.CompositionTarget_Rendering;
    }

    private void CompositionTarget_Rendering(object sender, EventArgs e)
    {
         Point position = Mouse.GetPosition(RectangleArea);
          
      hitStatus = "no hit";
      
      VisualTreeHelper.HitTest(RectangleArea,null,
              new HitTestResultCallback(HitTestResultHandler),
              new PointHitTestParameters(position)
      );
      this.HitLabel.Content = String.Format("Result of the hit test: {0}", hitStatus);
    }
    
    public HitTestResultBehavior HitTestResultHandler(HitTestResult result)
    {
      PointHitTestResult hitResult = (PointHitTestResult)result;
      
      hitStatus = String.Format("{0} was hit at this point: {1}", 
        ((FrameworkElement)hitResult.VisualHit).Name, 
        hitResult.PointHit.ToString()
      );
         return HitTestResultBehavior.Continue;
    }
  }
}

   
    
  

Related examples in the same category

1.	A line which monitors the mouse entering its area
2.	Respond When the User Rotates the Mouse Wheel
3.	Mouse Position and TranslateTransform
4.	Mouse Position
5.	Detect whether the mouse button is pressed or released using the MouseButtonState property.
6.	Handler MouseLeftButtonDown and MouseLeftButtonUp events
7.	Mouse Enter and leave a Border
8.	Make an object follow the mouse pointer as it moves on the screen.
9.	Use Mouse.AddPreviewMouseDownHandler(myEllipse, PreviewMouseDownEllipse);
10.	Use Mouse.AddMouseDownHandler(myEllipse, MouseDownEllipse);
11.	Use Mouse.PreviewMouseDown /Mouse.MouseDown Attribute from Grid element
12.	Grid MouseMove
13.	Grid MouseLeftButtonDown
14.	Grid MouseLeftButtonUp
15.	UI Element Mouse Clicked Events
16.	Handles the MouseDown event on the Canvas
17.	Handles the MouseDown event on the UniformGrid
18.	Mouse cursor override and clear
19.	Check the mouse event source
20.	Use the Mouse Wheel action methods that are defined by the IScrollInfo interface
21.	Mouse.LostMouseCaptureEvent
22.	Use Mouse.Capture to let a Control capture an event
23.	Capture Mouse Ellipse
24.	Get mouse position with Mouse.GetPosition
25.	Replease mouse with Mouse.Capture(null)
26.	Hit Result Behavior