Z訂單和事件處理wpf

Question

這是跟我的問題here。看起來即使InkPresenter離用戶最近，Image元件也會接收到這些事件。有誰知道這是爲什麼？

編輯：如果對不起，我沒有做的問題更清楚：

我已經attatched事件處理程序的InkPresenter，這是Image的兄弟。我已將InkPresenter的ZIndex設置爲2（其他元素的值爲ZIndex）。我不確定爲什麼圖像接收到事件處理程序。我認爲具有最高ZIndex的元素最接近用戶。因此，它將首先接收用戶生成的事件，但在這種情況下，Image會收到它們。

我的代碼如下：

CustomImage.cs

[TemplatePart(Name="PART_InkPresenter",Type=typeof(InkPresenter))] 
[TemplatePart(Name="PART_Image",Type=typeof(Image))] 
public class CustomImage : Control 
{ 
    public static DependencyProperty SourceProperty; 

    public string Source 
    { 
     get { return (string)GetValue(SourceProperty); } 
     set { SetValue(SourceProperty,value); } 
    } 

    private InkPresenter _presenter; 
    private Image _image; 


    static CustomImage() 
    { 
     DefaultStyleKeyProperty.OverrideMetadata(typeof(CustomImage), 
       new FrameworkPropertyMetadata(typeof(CustomImage))); 

     SourceProperty = DependencyProperty.Register("Source", 
       typeof(string), typeof(CustomImage)); 
    } 

    public override void OnApplyTemplate() 
    { 
     base.OnApplyTemplate(); 
     _presenter = base.GetTemplateChild("PART_InkPresenter") as InkPresenter; 
     _image = base.GetTemplateChild("PART_Image") as Image; 

     _presenter.MouseDown += new MouseButtonEventHandler(_presenter_MouseDown); 
     _presenter.MouseMove += new MouseEventHandler(_presenter_MouseMove); 
     _presenter.MouseUp += new MouseButtonEventHandler(_presenter_MouseUp); 


    } 

    void _presenter_MouseUp(object sender, MouseButtonEventArgs e) 
    { 
     // ... 
    } 

    void _presenter_MouseMove(object sender, MouseEventArgs e) 
    { 
     // ... 
    } 

    void _presenter_MouseDown(object sender, MouseButtonEventArgs e) 
    { 
     // ... 
    } 

Generic.xaml

<ResourceDictionary 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:local="clr-namespace:CustomImage"> 
    <Style TargetType="{x:Type local:CustomImage}"> 
     <Setter Property="Template"> 
      <Setter.Value> 
       <ControlTemplate TargetType="{x:Type local:CustomImage}"> 
        <ControlTemplate.Resources> 
         <local:StringtoImageSource x:Key="ImageSourceConverter"/> 
        </ControlTemplate.Resources> 
        <Canvas Width="{TemplateBinding Width}" 
          Height="{TemplateBinding Height}">    
         <Image x:Name="PART_Image" 
           Width="{TemplateBinding Width}" 
           Height="{TemplateBinding Height}" Source="{Binding 
           RelativeSource={RelativeSource TemplatedParent}, 
           Path=Source, 
           Converter={StaticResource ImageSourceConverter}}"/> 
         <InkPresenter Canvas.ZIndex="2" 
           x:Name="PART_InkPresenter" 
           Width="{TemplateBinding Width}" 
           Height="{TemplateBinding Height}"/> 
        </Canvas> 
       </ControlTemplate> 
      </Setter.Value> 
     </Setter> 
    </Style> 
</ResourceDictionary> 

Answer 1

因爲他們沒有被別的處理？如果沒有人處理該事件（將e.Handled設置爲true），他們將繼續遍歷WPF可視化樹。這是路由事件應該做的事情。

您還沒有真正提供足夠的信息來了解是否應該處理它們。