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我已经为我的通用应用程序构建了类似这样的类。目前在WP8.1部分工作。usercontrol-WP8.1中的空datacontext C#
下面的类放在共享代码中。 (希望用它在Win8.1)
- FolderItemViewer.xaml(用户控件)它是DataTemplate中在MainPage.xaml中
- FolderCollection类一个ListView,它是被绑定到ListView集合WP
现在的问题是,我已经将操纵事件连接到FolderItemViewer.xaml中的数据模板网格,以捕获左右滑动并且它正在工作。现在基于这个,我需要更新FolderCollection类中的CollectionItem,并因此更新Mainpage.xaml中的ListView。
- 如何捕获ListView项或由于操作事件位于FolderItemViewer类中的collectionitem边界?
- 我可以得到listview项吗?或者listlivew项目模板的回调函数已更改?或类似的事情?
编辑
对不起把这么多的代码。但是,真的很感谢有人帮助我们做到这一点。
这是FolderItemViewer.xaml
<UserControl
x:Class="JusWrite2.FolderItemViewer"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:JusWrite2"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid x:Name="MainGrid">
<Grid Height="60" Width="380" Margin="0,0,0,1">
<Grid x:Name="ItemGrid" HorizontalAlignment="Left" VerticalAlignment="Center" Width="380" Height="60" Background="Transparent" Canvas.ZIndex="2"
ManipulationMode="TranslateX,System" ManipulationStarted="On_ChannelItem_ManipulationStarted" ManipulationDelta="On_ChannelItem_ManipulationDelta" ManipulationCompleted="OnChannelItemManipulationCompleted">
<TextBlock x:Name="titleTextBlock" Margin="20,0,0,0" Canvas.ZIndex="2" VerticalAlignment="Center" TextAlignment="Left" FontSize="25" >
</TextBlock>
</Grid>
<Grid x:Name="DelGrid" Opacity="0.0" HorizontalAlignment="Right" VerticalAlignment="Center" Height="60" Background="Red" Canvas.ZIndex="-1" Tapped="On_ChannelDelete_Tap" Width="380">
<Button Content="X" FontSize="25" Canvas.ZIndex="-1" VerticalAlignment="Center" HorizontalAlignment="Center" Width="380" BorderThickness="0" />
</Grid>
</Grid>
</Grid>
</UserControl>
代码背后
private void OnChannelItemManipulationCompleted(object sender, ManipulationCompletedRoutedEventArgs e)
{
Grid ChannelGrid = (Grid)sender;
Grid mGrid = (Grid)(ChannelGrid.Parent);
Grid DeleteGrid = (Grid)((Grid)(ChannelGrid.Parent)).Children[1];
FolderCollection swipedItem = ChannelGrid.DataContext as FolderCollection;// grid has null value for datacontext
double dist = e.Cumulative.Translation.X;
if (dist < -100)
{
// Swipe left
}
else
{
// Swipe right
}
}
FolderCollection.xaml在它有两个班。 FolderItem和FolderCollection
public class FolderItem : INotifyPropertyChanged
{
// variables
public FolderItem()
{
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
if (this.PropertyChanged != null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
public int CompletionStatus
{
//code
}
public int Priority
{
//code
}
public string FolderText
{
//code
}
public int PenColor
{
//code
}
public string UUID
{
//code
}
public string CreateUUID()
{
//code
}
}
public class FolderCollection : IEnumerable<Object>
{
private ObservableCollection<FolderItem> folderCollection = new ObservableCollection<FolderItem>();
private static readonly FolderCollection instance = new FolderCollection();
public static FolderCollection Instance
{
get
{
return instance;
}
}
public IEnumerator<Object> GetEnumerator()
{
return folderCollection.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
public void Add(FolderItem fItem)
{
folderCollection.Add(fItem);
}
public ObservableCollection<FolderItem> FolderCollectionInstance
{
get
{
return folderCollection;
}
}
}
这是MainPage.xaml,我有数据绑定。背后
//Constructor
FolderListView.DataContext = fc.FolderCollectionInstance;
FolderListView.ItemsSource = fc.FolderCollectionInstance;
private void ItemListView_ContainerContentChanging(ListViewBase sender, ContainerContentChangingEventArgs args)
{
FolderItemViewer iv = args.ItemContainer.ContentTemplateRoot as FolderItemViewer;
if (args.InRecycleQueue == true)
{
iv.ClearData();
}
else if (args.Phase == 0)
{
iv.ShowPlaceholder(args.Item as FolderItem);
// Register for async callback to visualize Title asynchronously
args.RegisterUpdateCallback(ContainerContentChangingDelegate);
}
else if (args.Phase == 1)
{
iv.ShowTitle();
args.RegisterUpdateCallback(ContainerContentChangingDelegate);
}
else if (args.Phase == 2)
{
//iv.ShowCategory();
//iv.ShowImage();
}
// For imporved performance, set Handled to true since app is visualizing the data item
args.Handled = true;
}
private TypedEventHandler<ListViewBase, ContainerContentChangingEventArgs> ContainerContentChangingDelegate
{
get
{
if (_delegate == null)
{
_delegate = new TypedEventHandler<ListViewBase, ContainerContentChangingEventArgs>(ItemListView_ContainerContentChanging);
}
return _delegate;
}
}
private TypedEventHandler<ListViewBase, ContainerContentChangingEventArgs> _delegate;
DataContext为空:( – alfah 2014-10-20 10:55:23
我在问题中添加了FolderItemViewer.xaml的xaml代码 – alfah 2014-10-20 11:27:55
然后数据绑定出现问题,如果您在列表框中使用它,那么FolderItemViewer.xaml应该只是一个DataTemplate – 2014-10-20 13:19:57