>假设我有一个包含 10 个列表视图项的列表视图，每个列表视图项都有其他嵌套的 UIElements。每个列表视图项都有一个嵌套的应用栏按钮。 默认情况下，AppBarButton 可见性设置为在 LisViewItem 中折叠。我希望当用户将鼠标悬停在列表视图项上时，应用栏按钮可见。
ListViewItem 附加了 PointerEntered="ListviewEnter"， PointerExited="ListviewExit" 事件处理程序。
<ListView ItemsSource="{x:Bind people}">
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="HorizontalContentAlignment"
Value="Stretch"/>
</Style>
</ListView.ItemContainerStyle>
<ListView.ItemTemplate>
<DataTemplate x:DataType="local:Person">
<ListViewItem
PointerEntered="ListviewEnter"
PointerExited="ListviewExit"
Background="LightBlue">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="{x:Bind name}"/>
<TextBlock Grid.Column="1" Text="{x:Bind age}"/>
<Border Grid.Column="2"
BorderBrush="Green"
BorderThickness="1">
<AppBarButton
x:Name="ssss"
Visibility="Collapsed"
Icon="Delete"
Label="Delete"
HorizontalAlignment="Right"/>
</Border>
</Grid>
</ListViewItem>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
可以在 Person 类中设置一个属性来绑定 AppBarButton 的可见性。将鼠标悬停在 ListViewItem 上时，将属性设置为 true 以显示 AppBarButton。
人员类：
public class Person : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged = delegate { };
public String name ...;
public String age ...;
private bool isShow = false;
public bool IsShow
{
get { return isShow; }
set
{
isShow = value;
this.OnPropertyChanged();
}
}
public void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
// Raise the PropertyChanged event, passing the name of the property whose value has changed.
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
XAML：
<AppBarButton Visibility="{x:Bind IsShow,Mode=OneWay}" Icon="Delete" Label="Delete" HorizontalAlignment="Right"/>
代码隐藏：
触发 ListViewEnter 和 ListViewExit 事件时，可以从中获取 Person 类，并更改 IsShow 属性以控制 AppBarButton 的可见性。
private void ListviewEnter(object sender, PointerRoutedEventArgs e)
{
ListViewItem item = sender as ListViewItem;
Person p = item.DataContext as Person;
p.IsShow = true;
}
private void ListviewExit(object sender, PointerRoutedEventArgs e)
{
ListViewItem item = sender as ListViewItem;
Person p = item.DataContext as Person;
p.IsShow = false;
}