WPF / C＃ - 对话窗口不响应Touch

Question

我正在开发一个C＃WPF应用程序，旨在使用专门的触摸在完整的Windows 10平板电脑上运行。 到目前为止，该应用程序运行良好，除了我的一个对话框窗口有不喜欢触摸的按钮。

对话窗口XAML：

<Window x:Class="Commencement_Organizer.ConfirmStudentWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:Commencement_Organizer"
    mc:Ignorable="d"
    Title="Confirmation" Topmost="True" Height="372.677" Width="578.225" ResizeMode="NoResize" WindowStartupLocation="CenterScreen" 
    WindowStyle="None" Background="White" AllowsTransparency="True" Stylus.IsTapFeedbackEnabled="False" Stylus.IsTouchFeedbackEnabled="False">

<Window.Triggers>
    <EventTrigger RoutedEvent="Window.Loaded">
        <BeginStoryboard>
            <Storyboard>
                <DoubleAnimation Duration="00:00:0.2" Storyboard.TargetProperty="Opacity" From="0" To="1" />
            </Storyboard>
        </BeginStoryboard>
    </EventTrigger>
</Window.Triggers>

<Grid Background="#FF171717">
    <Grid Margin="1" Background="White">
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>

        <Button x:Name="YesButton" Content="Yes" Margin="25" Grid.Row="2" Click="YesButton_Click"/>
        <Button x:Name="NoButton" Content="No" Margin="25" Grid.Row="2" Grid.Column="1" Click="NoButton_Click"/>
        <Label x:Name="label" Content="Confirm your name" Margin="0" Grid.ColumnSpan="2" HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="24"/>
        <Label x:Name="nameLabel" Content="Label" HorizontalAlignment="Center" Margin="0" Grid.Row="1" VerticalAlignment="Center" Grid.ColumnSpan="2" FontSize="24" FontWeight="Bold"/>

    </Grid>
</Grid>

实施（C＃）：

ConfirmStudentWindow confirmWindow = new ConfirmStudentWindow(student);
        confirmWindow.Confirm += OnConfirm;

        // This window makes everything behind the dialog window a grey tint, which makes the dialog more prominent
        var darkwindow = new Window() 
        {
            Background = Brushes.Black,
            Opacity = 0.4,
            AllowsTransparency = true,
            WindowStyle = WindowStyle.None,
            WindowState = WindowState.Maximized,
            Topmost = true,
            Effect = new BlurEffect()
        };
        darkwindow.Show(); // Show grey background tint
        confirmWindow.ShowDialog(); // Stops main UI thread
        darkwindow.Close();

关于这一切的一切都按预期工作，除非我尝试使用触摸屏来使用这些按钮，它们只会保持突出显示，但实际上不会点击。 用鼠标完美搭配。

在2个不同的Windows 10设备（Surface Pro 2和Surface Book）上测试。

把它放在一个问题的形式：

为什么以Dialog方式启动此窗口会使其无法触摸，但是如果它是作为常规窗口启动的话呢？

编辑 - 新问题：

有没有办法模拟对话窗口，除了启动一个始终保持在顶部的常规窗口，然后在其后面放置一个有色的叠加，同时为窗口提供一个提供用户输入结果的事件处理程序？

Answer 1

我尝试了你的例子，它在我的运行中没有任何问题。 我正在使用带有W10和.NET 4.5.2触摸显示器的DELL笔记本电脑。 我可以建议你的一件事是尝试在对话框中的按钮上连接StylusUp（或依赖于你的逻辑的StylusDown）事件。 过去只管理点击事件时，我确实遇到过类似的问题。

这对我有用，确认方法被调用，对话框关闭。

ConfirmStudentWindow.xaml.cs

using System;
using System.Windows;
using System.Windows.Input;

namespace DialogTouchTest
{
    /// <summary>
    /// Interaction logic for ConfirmStudentWindow.xaml
    /// </summary>
    public partial class ConfirmStudentWindow : Window
    {
        public Action Confirm;

        public ConfirmStudentWindow()
        {
            InitializeComponent();
        }

        private void YesButton_Click(object sender, RoutedEventArgs e)
        {
            e.Handled = true;
            Yes();
        }

        private void NoButton_Click(object sender, RoutedEventArgs e)
        {
            e.Handled = true;
            No();
        }

        private void YesButton_StylusUp(object sender, StylusEventArgs e)
        {
            e.Handled = true;
            Yes();
        }

        private void NoButton_StylusUp(object sender, StylusEventArgs e)
        {
            e.Handled = true;
            No();
        }

        private void Yes()
        {
            DialogResult = true;
            Confirm();
        }

        private void No()
        {
            DialogResult = false;
        }
    }
}

ConfirmStudentWindow.xaml

<Window x:Class="DialogTouchTest.ConfirmStudentWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Title="Confirmation" Topmost="True" Height="372.677" Width="578.225" ResizeMode="NoResize" WindowStartupLocation="CenterScreen" 
    WindowStyle="None" Background="White" AllowsTransparency="True" Stylus.IsTapFeedbackEnabled="False" Stylus.IsTouchFeedbackEnabled="False">

    <Window.Triggers>
        <EventTrigger RoutedEvent="Window.Loaded">
            <BeginStoryboard>
                <Storyboard>
                    <DoubleAnimation Duration="00:00:0.2" Storyboard.TargetProperty="Opacity" From="0" To="1" />
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </Window.Triggers>

    <Grid Background="#FF171717">
        <Grid Margin="1" Background="White">
            <Grid.RowDefinitions>
                <RowDefinition Height="*" />
                <RowDefinition Height="*" />
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*" />
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>

            <Button x:Name="YesButton" Content="Yes" Margin="25" Grid.Row="2" StylusUp="YesButton_StylusUp" Click="YesButton_Click"/>
            <Button x:Name="NoButton" Content="No" Margin="25" Grid.Row="2" Grid.Column="1" StylusUp="NoButton_StylusUp" Click="NoButton_Click"/>
            <Label x:Name="label" Content="Confirm your name" Margin="0" Grid.ColumnSpan="2" HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="24"/>
            <Label x:Name="nameLabel" Content="Label" HorizontalAlignment="Center" Margin="0" Grid.Row="1" VerticalAlignment="Center" Grid.ColumnSpan="2" FontSize="24" FontWeight="Bold"/>

        </Grid>
    </Grid>
</Window>

MainWindow.xaml.cs

using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Effects;

namespace DialogTouchTest
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void button_Click(object sender, RoutedEventArgs e)
        {
            ConfirmStudentWindow confirmWindow = new ConfirmStudentWindow();
            confirmWindow.Confirm += OnConfirm;

            // This window makes everything behind the dialog window a grey tint, which makes the dialog more prominent
            var darkwindow = new Window()
            {
                Background = Brushes.Black,
                Opacity = 0.4,
                AllowsTransparency = true,
                WindowStyle = WindowStyle.None,
                WindowState = WindowState.Maximized,
                Topmost = true,
                Effect = new BlurEffect()
            };
            darkwindow.Show(); // Show grey background tint
            confirmWindow.ShowDialog(); // Stops main UI thread
            darkwindow.Close();
        }

        private void OnConfirm()
        {

        }
    }
}

Answer 2

比较两个相同的.Show()方法，一个是从ViewModel执行的，另一个是在代码隐藏中执行的，我发现代码隐藏实例没有检测到触摸。

我的解决方案是从代码隐藏调用主UI线程上的方法：

Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Normal, (Action)(() =>
{
     window.Show()
}));

请注意，如果您期望对话框中的结果，则需要将其包含在`Dispatched.BeginInvoke'方法中，否则它将无法正常工作。

理想情况下，将所有相关逻辑分组是最佳方法。