[英]Different ListView item Launch Different Flyout
我正在尋找一種方法,以根據變量Type
的值為不同的ListViewItem啟動不同的Flyout,並且當前轉換器無法正常工作。
假設我有1個Converter,2個Flayouts和1個DataTemplate。
<Page.Resources>
<common:TypeToFlyoutTypeConverter x:Key="typeToFlyoutConverter"/>
<Flyout x:Name="FlyoutTemplateConfirmed">
<Grid >
<TextBlock Text="Confirmed"/>
</Grid>
</Flyout>
<Flyout x:Name="FlyoutTemplateRejected">
<Grid >
<TextBlock Text="Rejected"/>
</Grid>
</Flyout>
<DataTemplate x:Key="ListViewItemTemplate">
<Grid Tapped="Grid_Tapped"
FlyoutBase.AttachedFlyout="{Binding Type, Converter={StaticResource typeToFlyoutConverter}}">
</Grid>
</DataTemplate>
</Page.Resources>
而轉換器:
public class TypeToFlyoutTypeConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, string language)
{
if ((value as String).Contains("TypeConfirmed"))
return "StaticResource FlyoutTemplateConfirmed";
else
return "StaticResource FlyoutTemplateRejected";
}
public object ConvertBack(object value, Type targetType, object parameter, string language)
{
throw new NotSupportedException();
}
}
和ListView:
<ListView
SelectionMode="None" IsItemClickEnabled="True" IsSwipeEnabled="false"
ItemTemplate="{StaticResource ListViewItemTemplate}"
ItemsSource="{Binding}">
</ListView>
和Grid_Tapped
事件處理程序:
private void Grid_Tapped(object sender, TappedRoutedEventArgs e)
{
FrameworkElement element = sender as FrameworkElement;
if (element != null)
{
FlyoutBase.ShowAttachedFlyout(sender as FrameworkElement);
}
}
是否可以根據Type
的值啟動不同的Flyout?
謝謝!
你可以使用基於類型的多態
public object ShowAttachedFlyout(FrameworkElement t)
{
}
public object ShowAttachedFlyout( OtherspecificTYpe o)
{
}
然后用動態調用
FlyoutBase.ShowAttachedFlyout((dynamic)sender);
在徘徊了幾個小時的stackoverflow之后,我有了一個很好的主意來解決這個問題 :
我不使用轉換器,而是定義要附加的彈出Grid_Tapped
並在Grid_Tapped
上Grid_Tapped
編程方式顯示它:
private void Grid_Tapped(object sender, TappedRoutedEventArgs e)
{
string itemType = ((sender as Grid).DataContext as blabla).Type;
if (itemType.Contains("blibli") && (sender as FrameworkElement) != null)
FlyoutBase.SetAttachedFlyout(sender as FrameworkElement, (Flyout)this.Resources["FlyoutTemplateConfirmed"]);
else if ((sender as FrameworkElement) != null)
FlyoutBase.SetAttachedFlyout(sender as FrameworkElement, (Flyout)this.Resources["FlyoutTemplateRejected"]);
FlyoutBase.ShowAttachedFlyout(sender as FrameworkElement);
}
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