UWP：PointerPressed 未在子元素上触发

Question

我有一个 UWP 应用，其中一个 RelativePanel“父级”包含另一个 RelativePanel“子级”。 它们都应该能够以不同的方式处理 PointerPressed 事件。

当我单击父级时，父级的 PointerPressed 事件处理程序被正确触发，但是当我单击子级时，再次仅触发父级的 PointerPressed 事件处理程序，因此子级的 PointerPressed 事件处理程序永远不会被调用。

如何配置子进程以调用其 PointerPressed 事件处理程序？

这是创建这些元素的代码摘录（一切都在后面的代码中完成，因为这些元素应该在运行时创建）：

public class ChildView
{
    public RelativePanel View { get; set; }

    public ChildView()
    {
        View.Width = 18;
        View.Height = 18;
        View.SetValue(Canvas.ZIndexProperty, 30);  // we want the child always on top of the parent
        View.Background = new SolidColorBrush(Colors.Transparent);

        // Add the gesture recognizers:
        View.Holding += HandleLongPressGesture;
        View.PointerPressed += HandleTapGesture;
        View.PointerReleased += HandlePointerReleased;
        View.DoubleTapped += HandleDoubleTapGesture;
    }

    public void HandleLongPressGesture(object sender, HoldingRoutedEventArgs e)
    {
        // my logic
    }
    private void HandlePointerReleased(object sender, PointerRoutedEventArgs e)
    {
        // my logic
    }
    private void HandleDoubleTapGesture(object sender, DoubleTappedRoutedEventArgs e)
    {
        // my logic
    }
    private void HandleTapGesture(object sender, PointerRoutedEventArgs e)
    {
        // my logic
    }
}

public class ParentView
{
    private ChildView child;

    public RelativePanel View { get; set; }

    public ParentView()
    {
        child = new ChildView();
        View.Children.Add(child.View);
        View.PointerPressed += HandleTapGesture;
        View.PointerReleased += HandlePointerReleased;
    }

    private void HandlePointerReleased(object sender, PointerRoutedEventArgs e)
    {
        // my logic
    }
    private void HandleDoubleTapGesture(object sender, DoubleTappedRoutedEventArgs e)
    {
        // my logic
    }
}

Answer 1

将子面板的背景设置为透明。

当事件触发时，请确保执行 .Handled=true; 在传入的处理程序参数上，以防止传播到父控件。

Answer 2

我知道这并不完全是您问题的答案，但也许它会以某种方式帮助您进行调试。

好的，所以我设置了一个简单的项目（在您将代码添加到问题之前）并且无法复制您的问题。

基本上，子点击事件被正确触发，然后父点击事件被立即触发，在这种情况下，这对我来说似乎是正确的。

XAML

<Grid>
    <RelativePanel Name="Parent" HorizontalAlignment="Left" Height="460" Margin="437,162,0,0" VerticalAlignment="Top" Width="458" Background="#FFFF5C5C" PointerPressed="Parent_PointerPressed">
        <RelativePanel Name="Child" HorizontalAlignment="Left" Height="360" Margin="62,50,0,0" VerticalAlignment="Top" Width="334" Background="#FF3B9C9C" PointerPressed="Child_PointerPressed"/>
    </RelativePanel>
</Grid>

C#

    private void Parent_PointerPressed(object sender, PointerRoutedEventArgs e)
    {
        // Breaks here when Parent is pressed
        // Also breaks here after breaking on Child_PointerPressed
    }

    private void Child_PointerPressed(object sender, PointerRoutedEventArgs e)
    {
        // Breaks here when Child is pressed
    }