[英]ListView ManipulationCompleted event doesn't work on phone
[英]ManipulationCompleted event is not firing on Button
在我的Windows Phone 8.1通用應用程序中,我在ItemTemplate
有一個帶有按鈕的ListView
,我需要查看該按鈕的ManipulationStarted
和ManipulationCompleted
事件何時被觸發。 目前ManipulationStarted
工作正常,但ManipulationCompleted
卻沒有。 有人可以幫忙解釋原因嗎?
SnapsPage.xaml
<Grid Grid.Row="0" Background="#88686868">
<Grid.RowDefinitions>
<RowDefinition Height="130" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<StackPanel Grid.Row="0" Orientation="Vertical" Margin="20,0,0,0">
<TextBlock Text="{Binding Path=Manager.Account.Username, FallbackValue='loading...'}" Margin="0,12,0,0" Style="{ThemeResource HeaderTextBlockStyle}"/>
<TextBlock x:Uid="Snaps" Text="SNAPS" Style="{ThemeResource TitleTextBlockStyle}" Typography.Capitals="SmallCaps"/>
</StackPanel>
<ScrollViewer x:Name="ScrollViewer" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Disabled"
Padding="0,0,0,20" Grid.Row="1" HorizontalContentAlignment="Stretch">
<ListView HorizontalContentAlignment="Stretch"
ItemsSource="{Binding Path=Manager.Account.Snaps}">
<ListView.ItemTemplate>
<DataTemplate>
<Button x:Name="ButtonSnap" Style="{StaticResource BasicEmptyButtonStyle}"
ManipulationStarting="ButtonSnap_OnManipulationStarting"
ManipulationCompleted="ButtonSnap_OnManipulationCompleted"
ManipulationMode="All"
Command="{Binding ElementName=ItemsControl, Path=DataContext.TryDownloadMediaCommand}"
CommandParameter="{Binding}">
<!-- Content Here -->
</Button>
</DataTemplate>
</ListView.ItemTemplate>
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel HorizontalAlignment="Stretch"></VirtualizingStackPanel>
</ItemsPanelTemplate>
</ListView.ItemsPanel>
</ListView>
</ScrollViewer>
</Grid>
<Grid Grid.Row="0" x:Name="MediaGrid" Background="#FF000000" IsHitTestVisible="False">
<Image x:Name="MediaImage" IsHitTestVisible="False"/>
<Grid Width="45" Height="45" Background="#99000000"
VerticalAlignment="Top" HorizontalAlignment="Right" Margin="25">
<TextBlock Text="10" VerticalAlignment="Center" HorizontalAlignment="Center" FontFamily="Segoe WP Semibold" FontSize="24" />
</Grid>
</Grid>
SnapsPage.cs
private void ButtonSnap_OnManipulationStarting(object sender, ManipulationStartingRoutedEventArgs e)
{
Debug.WriteLine("ButtonSnap_OnManipulationStarting");
var button = sender as Button;
if (button == null) return;
var snap = button.DataContext as Snap;
if (snap == null) return;
_relevantSnap = snap;
_isFingerDown = true;
_scrollYIndex = ScrollViewer.VerticalOffset;
_holdingTimer.Start();
}
private void ButtonSnap_OnManipulationCompleted(object sender, ManipulationCompletedRoutedEventArgs e)
{
Debug.WriteLine("ButtonSnap_OnManipulationCompleted");
_isFingerDown = false;
if (_isMediaOpen)
DisposeMediaTidily();
}
注意:我使用Windows Phone 8.1 XAML App(不是Silverlight)進行了測試
Button有一個ManipulationMode of System,根據文檔 ,這意味着你不應該得到操縱事件。
元素必須具有除None或System之外的ManipulationMode值作為操作事件源
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