私は次のユーザーコントロールを持っています：ドットとその名前：
<UserControl x:Class="ShapeTester.StopPoint"
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/blend/2008"
mc:Ignorable="d"
d:DesignHeight="25" d:DesignWidth="100">
<StackPanel>
<Ellipse Stroke="DarkBlue" Fill="LightBlue" Height="10" Width="10"/>
<TextBlock Text="Eiffel Tower"/>
</StackPanel>
</UserControl>
これはカッコいい。
今、私はパネルを持っています、魔女で私はマウスで打った私のストップポイントを回復する必要があります：
public partial class StopsPanel : UserControl
{
private List<StopPoint> hitList = new List<StopPoint>();
private EllipseGeometry hitArea = new EllipseGeometry();
public StopsPanel()
{
InitializeComponent();
Initialize();
}
private void Initialize()
{
foreach (StopPoint point in StopsCanvas.Children)
{
point.Background = Brushes.LightBlue;
}
}
private void OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
// Initialization:
Initialize();
// Get mouse click point:
Point pt = e.GetPosition(StopsCanvas);
// Define hit-testing area:
hitArea = new EllipseGeometry(pt, 1.0, 1.0);
hitList.Clear();
// Call HitTest method:
VisualTreeHelper.HitTest(StopsCanvas, null,
new HitTestResultCallback(HitTestCallback),
new GeometryHitTestParameters(hitArea));
if (hitList.Count > 0)
{
foreach (StopPoint point in hitList)
{
// Change rectangle fill color if it is hit:
point.Background = Brushes.LightCoral;
}
MessageBox.Show(string.Format(
"You hit {0} StopPoint(s)", hitList.Count));
}
}
public HitTestResultBehavior HitTestCallback(HitTestResult result)
{
if (result.VisualHit is StopPoint)
{
//
//-------- NEVER ENTER HERE!!! :(
//
// Retrieve the results of the hit test.
IntersectionDetail intersectionDetail =
((GeometryHitTestResult)result).IntersectionDetail;
switch (intersectionDetail)
{
case IntersectionDetail.FullyContains:
// Add the hit test result to the list:
hitList.Add((StopPoint)result.VisualHit);
return HitTestResultBehavior.Continue;
case IntersectionDetail.Intersects:
// Set the behavior to return visuals at all z-order levels:
return HitTestResultBehavior.Continue;
case IntersectionDetail.FullyInside:
// Set the behavior to return visuals at all z-order levels:
return HitTestResultBehavior.Continue;
default:
return HitTestResultBehavior.Stop;
}
}
else
{
return HitTestResultBehavior.Continue;
}
}
}
したがって、ご覧のとおり、HitTestがUserControl（StopPoint）をそのままではなく、そのコンポーネント（TextBlock、Ellipse、さらにはBorder）を識別するという問題があります。
ビジネスオブジェクトをStopPoint要素に関連付けるので、MouseHitting時に取得する必要があり、構成要素ではありません。
それを行う方法はありますか？
編集：
フィルタを使用する（現在、HitTestCallbackにはまったく入力されません）：
using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
namespace ShapeTester
{
/// <summary>
/// Interaction logic for StopsPanel.xaml
/// </summary>
public partial class StopsPanel : UserControl
{
private List<StopPoint> hitList = new List<StopPoint>();
private EllipseGeometry hitArea = new EllipseGeometry();
public StopsPanel()
{
InitializeComponent();
Initialize();
}
private void Initialize()
{
foreach (StopPoint point in StopsCanvas.Children)
{
point.Background = Brushes.LightBlue;
}
}
private void OnMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
// Initialization:
Initialize();
// Get mouse click point:
Point pt = e.GetPosition(StopsCanvas);
// Define hit-testing area:
hitArea = new EllipseGeometry(pt, 1.0, 1.0);
hitList.Clear();
// Call HitTest method:
VisualTreeHelper.HitTest(StopsCanvas,
new HitTestFilterCallback(MyHitTestFilter),
new HitTestResultCallback(HitTestCallback),
new GeometryHitTestParameters(hitArea));
if (hitList.Count > 0)
{
foreach (StopPoint point in hitList)
{
// Change rectangle fill color if it is hit:
point.Background = Brushes.LightCoral;
}
MessageBox.Show(string.Format(
"You hit {0} StopPoint(s)", hitList.Count));
}
}
public HitTestResultBehavior HitTestCallback(HitTestResult result)
{
if (result.VisualHit is StopPoint)
{
//
//-------- NEVER ENTER HERE!!! :(
//
// Retrieve the results of the hit test.
IntersectionDetail intersectionDetail =
((GeometryHitTestResult)result).IntersectionDetail;
switch (intersectionDetail)
{
case IntersectionDetail.FullyContains:
// Add the hit test result to the list:
hitList.Add((StopPoint)result.VisualHit);
return HitTestResultBehavior.Continue;
case IntersectionDetail.Intersects:
// Set the behavior to return visuals at all z-order levels:
return HitTestResultBehavior.Continue;
case IntersectionDetail.FullyInside:
// Set the behavior to return visuals at all z-order levels:
return HitTestResultBehavior.Continue;
default:
return HitTestResultBehavior.Stop;
}
}
else
{
return HitTestResultBehavior.Continue;
}
}
// Filter the hit test values for each object in the enumeration.
public HitTestFilterBehavior MyHitTestFilter(DependencyObject o)
{
// Test for the object value you want to filter.
if (o.GetType() == typeof(StopPoint))
{
// Visual object's descendants are
// NOT part of hit test results enumeration.
return HitTestFilterBehavior.ContinueSkipChildren;
}
else
{
// Visual object is part of hit test results enumeration.
return HitTestFilterBehavior.Continue;
}
}
}
}