UWP中的Longpress

Question

我正在将应用程序移植到Univeral Windows Platform（Windows 10）。

Android有一个onLongPress event。是否有UWP的等价物？

我发现有一个Holding event，我尝试使用这样的东西：

private void Rectangle_Holding(object sender, HoldingRoutedEventArgs e)
{
    if (e.HoldingState == HoldingState.Started)
    {
        Debug.WriteLine("Holding started!");
    }
}

问题是当使用鼠标而不是触摸时，Windows桌面上不会触发事件。

Answer 1

默认情况下，鼠标输入不会产生保持事件，您应该使用RightTapped事件来显示上下文菜单，当用户长按触摸设备并右键单击鼠标设备时，它会被触发。

看看GestureRecognizer.Holding和Detect Simple Touch Gestures，您可以使用以下代码实现这一目标

public sealed partial class MainPage : Page
{
    GestureRecognizer gestureRecognizer = new GestureRecognizer();

    public MainPage()
    {
        this.InitializeComponent();
        gestureRecognizer.GestureSettings = Windows.UI.Input.GestureSettings.HoldWithMouse;         
    }

    void gestureRecognizer_Holding(GestureRecognizer sender, HoldingEventArgs args)
    {
        MyTextBlock.Text = "Hello";
    }

    private void Page_Loaded(object sender, RoutedEventArgs e)
    {
        gestureRecognizer.Holding += gestureRecognizer_Holding;
    }

    private void Grid_PointerPressed(object sender, PointerRoutedEventArgs e)
    {
        var ps = e.GetIntermediatePoints(null);
        if (ps != null && ps.Count > 0)
        {
            gestureRecognizer.ProcessDownEvent(ps[0]);
            e.Handled = true;
        }
    }

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

    private void Grid_PointerReleased(object sender, PointerRoutedEventArgs e)
    {
        var ps = e.GetIntermediatePoints(null);
        if (ps != null && ps.Count > 0)
        {
            gestureRecognizer.ProcessUpEvent(ps[0]);
            e.Handled = true;
            gestureRecognizer.CompleteGesture();
        }
    }
}