Question

我有一个包含Canvas和几个按钮的基本页面模板。 Canvas有一些动画正在进行中。我也想在这个页面上检测击键。

我在LayoutRoot网格上使用了KeyDown事件，它之前有效，但是随着我进一步构建应用程序，它停止了工作。我也尝试在PageRoot中使用KeyDown事件，但仍然无效。

我在下面的XAML中粘贴。

<common:LayoutAwarePage
x:Name="pageRoot"
x:Class="Shooter.Game"
DataContext="{Binding DefaultViewModel, RelativeSource={RelativeSource Self}}"
IsTabStop="false"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Shooter"
xmlns:common="using:Shooter.Common"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" >

<Page.Resources>

    <!-- TODO: Delete this line if the key AppName is declared in App.xaml -->
    <x:String x:Key="AppName">Hits</x:String>
</Page.Resources>

<!--
    This grid acts as a root panel for the page that defines two rows:
    * Row 0 contains the back button and page title
    * Row 1 contains the rest of the page layout
-->
<Grid Style="{StaticResource LayoutRootStyle}" Background="Navy" KeyDown="Grid_KeyDown_1" >
    <Grid.RowDefinitions>
        <RowDefinition Height="95"/>
        <RowDefinition Height="*"/>
        <RowDefinition Height="150" />
    </Grid.RowDefinitions>

    <!-- Back button and page title -->
    <Grid Name="navBar">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="*"/>
        </Grid.ColumnDefinitions>
        <Button x:Name="backButton" Grid.Column="0" Click="GoBack" IsEnabled="{Binding Frame.CanGoBack, ElementName=pageRoot}" Style="{StaticResource BackButtonStyle}"/>
        <TextBlock Visibility="Collapsed" x:Name="pageTitle" Grid.Column="1" Text="{StaticResource AppName}" Style="{StaticResource PageHeaderTextStyle}"/>
        <TextBlock x:Name="hitCountTxt" Grid.Column="1" Text="Hits: 0" Style="{StaticResource PageHeaderTextStyle}" />
        <TextBlock x:Name="missCountTxt" Grid.Column="1" Text="Miss: 0" Style="{StaticResource PageHeaderTextStyle}" HorizontalAlignment="Right" />
    </Grid>
    <Grid Grid.Row="1" Name="gameBoard">
        <Canvas Name="warZone" Width="Auto" />
    </Grid>
    <Grid Grid.Row="2" Name="dashBoard">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="200" />
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="200" />
        </Grid.ColumnDefinitions>
        <Button Name="Dit" Grid.Column="0" Content="Dit" Width="200" Height="140" FontSize="40" Click="Dit_Click" />
        <Button Name="Dah" Grid.Column="2" Content="Dah" Width="200" Height="140" FontSize="40" Click="Dah_Click" />
        <TextBlock Name="fireCodeTxt" Grid.Column="1" VerticalAlignment="Center" HorizontalAlignment="Center" Text="No shots Fired!" FontSize="60" />
    </Grid>

    <VisualStateManager.VisualStateGroups>

        <!-- Visual states reflect the application's view state -->
        <VisualStateGroup x:Name="ApplicationViewStates">
            <VisualState x:Name="FullScreenLandscape"/>
            <VisualState x:Name="Filled"/>

            <!-- The entire page respects the narrower 100-pixel margin convention for portrait -->
            <VisualState x:Name="FullScreenPortrait">
                <Storyboard>
                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="backButton" Storyboard.TargetProperty="Style">
                        <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PortraitBackButtonStyle}"/>
                    </ObjectAnimationUsingKeyFrames>
                </Storyboard>
            </VisualState>

            <!-- The back button and title have different styles when snapped -->
            <VisualState x:Name="Snapped">
                <Storyboard>
                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="backButton" Storyboard.TargetProperty="Style">
                        <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource SnappedBackButtonStyle}"/>
                    </ObjectAnimationUsingKeyFrames>
                    <ObjectAnimationUsingKeyFrames Storyboard.TargetName="pageTitle" Storyboard.TargetProperty="Style">
                        <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource SnappedPageHeaderTextStyle}"/>
                    </ObjectAnimationUsingKeyFrames>
                </Storyboard>
            </VisualState>
        </VisualStateGroup>
    </VisualStateManager.VisualStateGroups>
</Grid>

Answer 1

您可以在NavigatedTo事件中订阅Window.Current.CoreWindow.KeyDown / Up并在NavigatedFrom中取消订阅。这些应该有效。否则，具有焦点的控件将有机会处理这些事件并将其标记为Handled以防止它们冒泡。

Answer 2

您可以在页面构建时订阅键上/下事件。请参阅以下代码：

    public MyPage()
    {
        InitializeComponent();            
        KeyUp += MyPage_KeyUp;           
    }

    private void MyPage_KeyUp(object sender, KeyRoutedEventArgs e)
    {
        //Your code here
    }

在WinRT应用程序中检测按键笔划

2 个答案: