Question

我有一个绑定的ListView，它使用Grid作为ItemTemplate。网格有一个MenuFlyout，由Hold事件触发。在模拟器中，一切都很好，但在设备（带有Windows 8.1更新的Lumia 635）上运行时，Grid Holding事件不会触发。

如果我向ListView添加一个hold事件，则会触发此事件，但是我没有引用该项目。

要复制，1）将其添加到默认页面的主页标签

中

<Page.Resources>
    <Style TargetType="TextBlock"  x:Key="GridText">
        <Setter Property="FontSize" Value="20" />
        <Setter Property="FontWeight" Value="Normal" />
        <Setter Property="HorizontalAlignment" Value="Center" />
    </Style>
</Page.Resources>
<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="*" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <ScrollViewer HorizontalAlignment="Stretch" Grid.Row="0" Margin="10" x:Name="scrollRecord" Background="DarkMagenta">
        <TextBlock x:Name="textRecord" FontSize="18" />
    </ScrollViewer>
    <ScrollViewer HorizontalAlignment="Stretch" Grid.Row="1" Margin="10">
        <ListView x:Name="listView" HorizontalAlignment="Stretch">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <Grid HorizontalAlignment="Stretch"  Holding="Grid_Holding">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*"/>
                        </Grid.ColumnDefinitions>
                        <FlyoutBase.AttachedFlyout>
                            <MenuFlyout>
                                <MenuFlyoutItem x:Name="buttonTick"
                                                        Text="Add"
                                                        Click="buttonAdd_Click"/>
                                <MenuFlyoutItem x:Name="buttonUntick"
                                                        Text="Remove"
                                                        Click="buttonRemove_Click"/>
                            </MenuFlyout>
                        </FlyoutBase.AttachedFlyout>

                        <TextBlock Style="{StaticResource GridText}"  Grid.Column="0" Text="{Binding Colour}" />
                    </Grid>
                </DataTemplate>
            </ListView.ItemTemplate>

        </ListView>
    </ScrollViewer>
</Grid>

创建一个名为Route的类，并将其粘贴到

中

[DataContract] class Route：INotifyPropertyChanged { 公共事件PropertyChangedEventHandler PropertyChanged;

public Route()
{
}

public Route(string colour)
{
    Colour = colour;
}

[DataMember]
public string Colour { get; set; }

protected void OnPropertyChanged(PropertyChangedEventArgs e)
{
    PropertyChangedEventHandler handler = PropertyChanged;
    if (handler != null)
        handler(this, e);
}

protected void OnPropertyChanged(string propertyName)
{
    OnPropertyChanged(new PropertyChangedEventArgs(propertyName));
}

}

类RouteList：ObservableCollection // ElementCollection {

}

在MainPage.xaml.cs中，选择类定义下面的所有内容，然后打开大括号并将其粘贴到

中

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

RouteList routes;

void MainPage_Loaded(object sender, RoutedEventArgs e)
{
    routes = new RouteList();
    routes.Add(new Route("Red"));
    routes.Add(new Route("Orange"));
    routes.Add(new Route("Pink"));
    routes.Add(new Route("Blue"));
    routes.Add(new Route("Violet"));

    listView.ItemsSource = routes;

    //DataTemplate t = listView.ItemTemplate;
    //AddText("gridLayout holding)
}

/// <summary>
/// Invoked when this page is about to be displayed in a Frame.
/// </summary>
/// <param name="e">Event data that describes how this page was reached.
/// This parameter is typically used to configure the page.</param>
protected override void OnNavigatedTo(NavigationEventArgs e)
{
    // TODO: Prepare page for display here.

    // TODO: If your application contains multiple pages, ensure that you are
    // handling the hardware Back button by registering for the
    // Windows.Phone.UI.Input.HardwareButtons.BackPressed event.
    // If you are using the NavigationHelper provided by some templates,
    // this event is handled for you.
}



private void Grid_Holding(object sender, HoldingRoutedEventArgs e)
{
    try
    {
        AddText("Grid_Holding fired " + e.HoldingState.ToString());
        //ShowFlyout(sender);
    }
    catch (Exception ex)
    {
        AddText(ex.Message);
    }
}

private void ShowFlyout(object sender)
{
    FrameworkElement senderElement = sender as FrameworkElement;
    FlyoutBase flyoutBase = FlyoutBase.GetAttachedFlyout(senderElement);
    flyoutBase.ShowAt(senderElement);
}

private void AddText(string s)
{
    textRecord.Text += s + "\n";
    //scrollRecord.ScrollToVerticalOffset(scrollRecord.ScrollableHeight);
    scrollRecord.ChangeView(0, scrollRecord.ScrollableHeight,1.0f,false);
}

private void buttonAdd_Click(object sender, RoutedEventArgs e)
{
    try
    {
        AddText("Adding...");
        MenuFlyoutItem m = sender as MenuFlyoutItem;
        Route route = m.DataContext as Route;
        if (route != null)
        {
            string colour = route.Colour + "+";
            routes.Add(new Route(colour));
        }
    }
    catch (Exception ex)
    {
        AddText(ex.Message);

    }
    AddText("Finished");
}

private void buttonRemove_Click(object sender, RoutedEventArgs e)
{
    MenuFlyoutItem m = sender as MenuFlyoutItem;
    Route route = m.DataContext as Route;
    if (route != null)
    {
        routes.Remove(route);
    }
}

private void listView_Holding(object sender, HoldingRoutedEventArgs e)
{
    try
    {

        AddText("listView_Holding fired " + e.HoldingState.ToString());
        //ShowFlyout(sender);
    }
    catch (Exception ex)
    {
        AddText(ex.Message);
    }
}

Windows Phone 8.1 ListView ItemTemplate Grid保持事件未在设备上触发

0 个答案: