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POZ order and event handling wpf
 

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    <p>This is a follow up to my question <a href="https://stackoverflow.com/questions/1162963/z-order-in-between-image-and-inkpresenter">here</a>. It seems that even though the <code>InkPresenter</code> is closest to the user, the <code>MouseDown</code>/<code>MouseMove</code>/<code>MouseUp</code> events are received by the <code>Image</code> element. Does anyone know why that is?</p> <p><strong>Edit:</strong> Sorry if I didn't make the question clearer: </p> <p>I have attatched event handlers to the <code>InkPresenter</code>, which is a sibling of the <code>Image</code>. I have set the <code>ZIndex</code> of the <code>InkPresenter</code> to 2 (other elements have 0 as the <code>ZIndex</code>). I'm not sure why the event handlers are received by the the Image. I assumed that the element which has the highest <code>ZIndex</code> would be closest to the user. Thus, it would be the first to receive the <code>MouseDown</code>/<code>MouseMove</code>/<code>MouseUp</code> events generated by the user however in this case the <code>Image</code> receives them.</p> <p>My code is as follows:</p> <p><strong>CustomImage.cs</strong></p> <pre><code>[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) { // ... } </code></pre> <p><strong>Generic.xaml</strong></p> <pre><code>&lt;ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:CustomImage"&gt; &lt;Style TargetType="{x:Type local:CustomImage}"&gt; &lt;Setter Property="Template"&gt; &lt;Setter.Value&gt; &lt;ControlTemplate TargetType="{x:Type local:CustomImage}"&gt; &lt;ControlTemplate.Resources&gt; &lt;local:StringtoImageSource x:Key="ImageSourceConverter"/&gt; &lt;/ControlTemplate.Resources&gt; &lt;Canvas Width="{TemplateBinding Width}" Height="{TemplateBinding Height}"&gt; &lt;Image x:Name="PART_Image" Width="{TemplateBinding Width}" Height="{TemplateBinding Height}" Source="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Source, Converter={StaticResource ImageSourceConverter}}"/&gt; &lt;InkPresenter Canvas.ZIndex="2" x:Name="PART_InkPresenter" Width="{TemplateBinding Width}" Height="{TemplateBinding Height}"/&gt; &lt;/Canvas&gt; &lt;/ControlTemplate&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; &lt;/ResourceDictionary&gt; </code></pre>
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