c# – 当子元素具有焦点UWP时选择ListViewItem
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我正在编写通用Windows应用程序,我有一个ListView,其中ListViewItems包含TextBox和Button.当我单击文本框时,我希望ListViewItem被选中.我找到了WPF的解决方案,但是UWP中没有Style.Triggers.任何人都可以指出我这样做的正确方法吗?
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:controls="using:CycleStreetsUniversal.Controls"
xmlns:common="using:CycleStreetsUniversal.Common"
xmlns:utils="using:CycleStreetsUniversal.Utils"
xmlns:interactivity="using:Microsoft.Xaml.Interactivity"
xmlns:core="using:Microsoft.Xaml.Interactions.Core"
xmlns:converters="using:CycleStreetsUniversal.Converters"
x:Class="CycleStreetsUniversal.Pages.HomePage"
mc:Ignorable="d" FontWeight="Light">
<Page.Resources>
<DataTemplate x:Key="DirectionItem">
<Grid Padding="8,6,0,6">
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="50"/>
<ColumnDefinition Width="50"/>
</Grid.ColumnDefinitions>
<AutoSuggestBox x:Name="autoSuggestBox" PlaceholderText="{Binding Watermark}" QueryIcon="Find" Text="{Binding LocationName}" />
<Button Grid.Column="2" Visibility="{Binding ShowAddButton, Converter={StaticResource BooleanToVisibilityConverter}}" />
<Button Grid.Column="1" Visibility="{Binding ShowMinusButton, Converter={StaticResource BooleanToVisibilityConverter}}" />
</Grid>
</DataTemplate>
</Page.Resources>
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Grid x:Name="Directions" HorizontalAlignment="Left" Margin="0" Width="346" DataContext="{Binding DirectionPlanner, Mode=OneWay, Source={StaticResource Locator}}">
<Grid.Background>
<SolidColorBrush Color="{ThemeResource SystemAltHighColor}"/>
</Grid.Background>
<StackPanel VerticalAlignment="Top">
<ListView x:Name="DirectionEntryList" ItemTemplate="{StaticResource DirectionItem}" ItemsSource="{Binding Entries}">
<ListView.ItemContainerStyle>
<Style TargetType="ListViewItem">
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
</Style>
</ListView.ItemContainerStyle>
</ListView>
<Button x:Name="crosshairButton" VerticalAlignment="Top" d:LayoutOverrides="LeftPosition, RightPosition" Margin="20,0" HorizontalAlignment="Stretch" Padding="0" Click="crosshairButton_Click">
<Grid Height="50">
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Image x:Name="image" Source="ms-appx:///Assets/crosshair.png"/>
<TextBlock Text="Set Location to Crosshair" Grid.Column="1" VerticalAlignment="Center" MaxLines="2" TextWrapping="Wrap"/>
</Grid>
</Button>
</StackPanel>
</Grid>
</Grid>
</Page>
数据模板中的AutoSuggestBox需要将DirectionEntryList中的选定项设置为AutoSuggestBox所属的List View项.
解决方法:
解决问题的代码
您可以做的是订阅AutoSuggestBox的GotFocus事件.
<AutoSuggestBox x:Name="autoSuggestBox" GotFocus="autoSuggestBox_GotFocus" />
然后,您只需要使用ListView.ContainerFromItem方法来定位实际的ListViewItem并将其IsSelected属性设置为true.
private void autoSuggestBox_GotFocus(object sender, RoutedEventArgs e)
{
var item = ((AutoSuggestBox)sender).DataContext;
var container = (ListViewItem)DirectionEntryList.ContainerFromItem(item);
container.IsSelected = true;
}
混合友好的解决方案(没有代码背后)
让我们通过将逻辑封装到行为中来改进这个答案.
首先,您需要从Reference Manager>添加Behaviors SDK(XAML)(版本12.0 atm).通用Windows>扩展.
那么基本上你只需要创建一个依赖属性来获取DirectionEntryList的引用并处理GotFocus事件,与后面的代码完全相同.
public class SelectListViewItemWhenElementGotFocusBehavior : DependencyObject, IBehavior
{
private UIElement _element;
public DependencyObject AssociatedObject { get; set; }
#region ListView reference
public ListView ListView
{
get { return (ListView)GetValue(ListViewProperty); }
set { SetValue(ListViewProperty, value); }
}
public static readonly DependencyProperty ListViewProperty =
DependencyProperty.Register("ListView", typeof(ListView), typeof(SelectListViewItemWhenElementGotFocusBehavior), new PropertyMetadata(null));
#endregion
public void Attach(DependencyObject associatedObject)
{
AssociatedObject = associatedObject;
_element = this.AssociatedObject as UIElement;
if (_element != null)
{
_element.GotFocus += OnElementGotFocus;
}
}
private void OnElementGotFocus(object sender, RoutedEventArgs e)
{
var item = ((AutoSuggestBox)sender).DataContext;
var container = (ListViewItem)ListView.ContainerFromItem(item);
container.IsSelected = true;
}
public void Detach()
{
if (_element != null)
{
_element.GotFocus += OnElementGotFocus;
}
}
}
要使用它,只需打开Blend,转到DataTemplate并将其附加到AutoSuggestBox.
<AutoSuggestBox x:Name="autoSuggestBox">
<Interactivity:Interaction.Behaviors>
<local:SelectListViewItemWhenElementGotFocusBehavior ListView="{Binding ElementName=DirectionEntryList}" />
</Interactivity:Interaction.Behaviors>
</AutoSuggestBox>
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