c# - XAML 检测列表视图项是否聚焦

Question

我试图检测列表视图中的哪个项目是焦点，但我没有检测到事件。我正在为 Xbox One UWP 开发，所以我不能使用鼠标或键盘事件，只能使用焦点。

<ListView.ItemTemplate>
    <DataTemplate>
        <StackPanel Orientation="Vertical" GotFocus="StackPanel_GotFocus" >
            <StackPanel Name="Imagestack" Orientation="Horizontal">
                <Image Source="{Binding Image}" Height="144" Width="256" HorizontalAlignment="Center" VerticalAlignment="Center"/>
            </StackPanel>
            <StackPanel Orientation="Horizontal">
                <TextBlock Text="{Binding Title}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
            </StackPanel>
        </StackPanel>
    </DataTemplate>
</ListView.ItemTemplate>

private void StackPanel_GotFocus(object sender, RoutedEventArgs e)
{
    Debug.WriteLine("Image focus");
    Image img = sender as Image;
    Bgimage.Source = img.Source;
}

Answer 1

您应该注册参加ListView.GotFocus活动。

OriginalSourcefrom event 参数将是ListViewItem获得焦点的那个。然后，您可以使用 检索项目内容 ListViewItem.Content。

XAML：

<ListView x:Name="list" GotFocus="list_GotFocus">
     <ListView.ItemTemplate>...</ListView.ItemTemplate>
</ListView>

后面的代码：

private void list_GotFocus(object sender, RoutedEventArgs e)
{
     var focusedItem = (e.OriginalSource as ListViewItem)?.Content; 
}

Answer 2

您无需获取焦点状态即可从单击的 ListViewItem 中获取数据，可能是您要查找的ItemClick事件：ListView

<ListView x:Name="LV_Items"
          IsItemClickEnabled="True"
          ItemClick="LV_Items_ItemClick"
          >
</ListView>

private void LV_Items_ItemClick(object sender, ItemClickEventArgs e)
{
    // Get instance of the model in the clicked ListViewItem
    MyModel myModel = (MyModel)e.ClickedItem;

    Image img = myModel.Image;
}