UWP - 父控件拦截指针事件（其中子控件为 ScrollViewer）

Question

我正在寻找一种方法来拦截所有事件，例如父级的 PointerReleased。

我的问题是我无法拦截 ScrollViewer 的父 PointerReleased 事件。

我想用手指将手指（光标）放入 ScrollViewer 移动 100 像素，然后松开；它应该像 Scrollviewer.IsHitTestVisible=false 一样工作，并将所有事件接收到 outerStack（scrollerviewer 的父级），但 scrollviewer 应该像 IsHitTestVisible=true 一样工作，并继续将所有相关事件获取到自身（scrollviewer）及其子级（scrollviewer 子级，如 innerStack )。

我收到以下日志

innerStack_PointerPressed
scrollView_PointerPressed
outerStack_PointerPressed
CoreWindow_PointerPressed

但我期待看到这个

innerStack_PointerPressed
scrollView_PointerPressed
outerStack_PointerPressed
CoreWindow_PointerPressed

outerStack_PointerReleased
CoreWindow_PointerReleased

有代码示例

<Page
    x:Class="App9.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <StackPanel x:Name="outerStack"
                Background="Red" 
                Padding="40"
                PointerPressed="outerStack_PointerPressed"
                PointerReleased="outerStack_PointerReleased">
        <ScrollViewer x:Name="scrollView"
                      Background="Blue" 
                      Padding="40"
                      PointerPressed="scrollView_PointerPressed"
                      PointerReleased="scrollView_PointerReleased"
                      VerticalScrollBarVisibility="Visible"
                      VerticalScrollMode="Enabled"
                      HorizontalScrollBarVisibility="Visible"
                      HorizontalScrollMode="Enabled"
                      Height="500">
            <StackPanel x:Name="innerStack"
                        Background="Green" 
                        Padding="40" 
                        PointerPressed="innerStack_PointerPressed"
                        PointerReleased="innerStack_PointerReleased">
                <TextBlock Text="A" FontSize="100"/>
                <TextBlock Text="B" FontSize="100"/>
                <TextBlock Text="C" FontSize="100"/>
                <TextBlock Text="D" FontSize="100"/>
                <TextBlock Text="E" FontSize="100"/>
                <TextBlock Text="F" FontSize="100"/>
                <TextBlock Text="G" FontSize="100"/>
                <TextBlock Text="H" FontSize="100"/>
                <TextBlock Text="I" FontSize="100"/>
                <TextBlock Text="J" FontSize="100"/>
                <TextBlock Text="K" FontSize="100"/>
                <TextBlock Text="L" FontSize="100"/>
                <TextBlock Text="M" FontSize="100"/>
                <TextBlock Text="N" FontSize="100"/>
                <TextBlock Text="O" FontSize="100"/>
                <TextBlock Text="P" FontSize="100"/>
                <TextBlock Text="Q" FontSize="100"/>
                <TextBlock Text="R" FontSize="100"/>
                <TextBlock Text="S" FontSize="100"/>
                <TextBlock Text="T" FontSize="100"/>
                <TextBlock Text="U" FontSize="100"/>
                <TextBlock Text="V" FontSize="100"/>
                <TextBlock Text="W" FontSize="100"/>
                <TextBlock Text="X" FontSize="100"/>
                <TextBlock Text="Y" FontSize="100"/>
                <TextBlock Text="Z" FontSize="100"/>
            </StackPanel>

        </ScrollViewer>
    </StackPanel>
</Page>

using System.Diagnostics;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Input;

namespace App9
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();

            Window.Current.CoreWindow.PointerPressed += CoreWindow_PointerPressed;
            Window.Current.CoreWindow.PointerReleased += CoreWindow_PointerReleased;
        }

        private void CoreWindow_PointerPressed(Windows.UI.Core.CoreWindow sender, Windows.UI.Core.PointerEventArgs args)
        {
            Debug.WriteLine("CoreWindow_PointerPressed");
        }

        private void CoreWindow_PointerReleased(Windows.UI.Core.CoreWindow sender, Windows.UI.Core.PointerEventArgs args)
        {
            Debug.WriteLine("CoreWindow_PointerReleased");
        }

        private void outerStack_PointerPressed(object sender, PointerRoutedEventArgs e)
        {
            Debug.WriteLine("outerStack_PointerPressed");
        }

        private void outerStack_PointerReleased(object sender, PointerRoutedEventArgs e)
        {
            Debug.WriteLine("outerStack_PointerReleased");
        }

        private void scrollView_PointerPressed(object sender, PointerRoutedEventArgs e)
        {
            Debug.WriteLine("scrollView_PointerPressed");
        }

        private void scrollView_PointerReleased(object sender, PointerRoutedEventArgs e)
        {
            Debug.WriteLine("scrollView_PointerReleased");
        }

        private void innerStack_PointerPressed(object sender, PointerRoutedEventArgs e)
        {
            Debug.WriteLine("innerStack_PointerPressed");
        }

        private void innerStack_PointerReleased(object sender, PointerRoutedEventArgs e)
        {
            Debug.WriteLine("innerStack_PointerReleased");
        }
    }
}

Answer 1

最简单的解决方法是将next属性放到ScrollViewer的内容视图中

ScrollViewer.Content.ManipulationMode="TranslateX,System"

解决方案并不完美，但很简单。

更多信息https://docs.microsoft.com/ru-ru/archive/blogs/wsdevsol/where-did-all-my-gestures-go

Answer 2

我的问题是我无法拦截 ScrollViewer 的父 PointerReleased 事件。

请参阅Events and routed events overview 文档，
将 Handled 属性设置为 true 会影响事件系统行为。当 Handled 为 true 时，大多数事件处理程序的路由停止；事件不会继续沿着路由通知其他附加的处理程序该特定事件情况。

所以你可以将滚动视图的PointerReleased Handled 设置为 true

private void scrollView_PointerPressed(object sender, PointerRoutedEventArgs e)
{
    Debug.WriteLine("scrollView_PointerPressed");
    e.Handled = true;
}

private void scrollView_PointerReleased(object sender, PointerRoutedEventArgs e)
{
    Debug.WriteLine("scrollView_PointerReleased");
    e.Handled = true;
}