WP8.1 中的手势识别块文本框

Gesture recognition blocks textbox in WP8.1

我正在为 Windows 通用应用实现手势交互控件。但是我发现了一个问题,如果我为容器定义手势设置而不是父 TextBox 控件之后将无法点击。

这是一个简化的布局代码:

<Page x:Class="App.MainPage">
    <Grid x:Name="RootGrid" Background="Transparent">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <TextBox Grid.Row="0" />
        <Button Grid.Row="1" Content="Click" />
    </Grid>
</Page>

这是一个简化的代码,可以重现该行为:

public sealed partial class MainPage : Page
{
    private GestureRecognizer _gr = new GestureRecognizer();
    public FrameworkElement Container { get; set; }

    public MainPage()
    {
        this.InitializeComponent();
        this.NavigationCacheMode = NavigationCacheMode.Required;
    }

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        this.Container = this.RootGrid;
        this.Container.PointerCanceled += OnPointerCanceled;
        this.Container.PointerPressed += OnPointerPressed;
        this.Container.PointerMoved += OnPointerMoved;
        this.Container.PointerReleased += OnPointerReleased;

        _gr.CrossSlideHorizontally = true;
        _gr.GestureSettings = GestureSettings.ManipulationTranslateRailsX;
    }

    private void OnPointerCanceled(object sender, PointerRoutedEventArgs e)
    {
        _gr.CompleteGesture();
        e.Handled = true;
    }

    private void OnPointerPressed(object sender, PointerRoutedEventArgs e)
    {
        _gr.ProcessDownEvent(e.GetCurrentPoint(null));
        this.Container.CapturePointer(e.Pointer);
        e.Handled = true;
    }

    private void OnPointerMoved(object sender, PointerRoutedEventArgs e)
    {
        _gr.ProcessMoveEvents(e.GetIntermediatePoints(null));
        e.Handled = true;
    }

    private void OnPointerReleased(object sender, PointerRoutedEventArgs e)
    {
        _gr.ProcessUpEvent(e.GetCurrentPoint(null));
        e.Handled = true;
    }
}

Debuggig 告诉我这种行为的主要原因是 OnPointerPressed 处理程序。当我单击 RootGridTextBox 时会调用此方法,但当我单击按钮时不会调用此方法。 object sender 总是 Windows.UI.Xaml.Controls.Grid 所以我无法确定它是否 TextBox

最有趣的是,相同的代码可以按预期用于 Windows 应用程序,但不适用于 Windows Phone 8.1 应用程序。

你能给我一些建议如何在不影响内部控件的情况下实现手势识别吗?

我没有找到比为 TextBox 控件添加 PointerPressed 事件处理程序更好的解决方案:

private void TextBox_OnPointerPressed(object sender, PointerRoutedEventArgs e)
{
    e.Handled = true;
}

它阻止为 this.Container 调用 OnPointerPressed,并允许以典型方式使用 TextBox。不是最好的解决方案,但对我来说效果很好。