我想在 a 中的当前选定项目周围创建一个边框LongListSelector，但我无法正确实现。通过引用http://code.msdn.microsoft.com/wpapps/Highlight-a-selected-item-30ced444我试图通过创建自定义Style来管理所选项目更改来遵循示例代码，尽管我正在尝试放置围绕图像而不是文本框的边框。此外，我确实有一个自定义ItemTemplate作为我DataTemplate的我的LongListSelector，它管理我的绑定图像的大小并控制ContextMenu每个项目所需的。
出于某种原因，我无法调整示例以在所选项目周围放置边框，但到目前为止我所拥有的如下
主页.xaml
<phone:PhoneApplicationPage.Resources>
<DataTemplate x:Key="ItemTemplate">
<!--<Border x:Name="brd" CornerRadius="10" BorderBrush="{StaticResource PhoneAccentBrush}" Width="Auto" BorderThickness="3">-->
<Border x:Name="brd" CornerRadius="10" Width="Auto" BorderThickness="3">
<Viewbox Width="108" Height="108">
<Image x:Name="recentImage" Source="{Binding Source}" Margin="6,6" Width="108"/>
</Viewbox>
<toolkit:ContextMenuService.ContextMenu>
<toolkit:ContextMenu x:Name="imgListContextMenu" Background="{StaticResource PhoneChromeBrush}">
<toolkit:MenuItem Foreground="{StaticResource PhoneForegroundBrush}" Header="edit" Click="editContextMenuItem_Click"/>
<toolkit:MenuItem Foreground="{StaticResource PhoneForegroundBrush}" Header="favorite" Click="favoriteContextMenuItem_Click"/>
<toolkit:MenuItem Foreground="{StaticResource PhoneForegroundBrush}" Header="delete" Click="deleteContextMenuItem_Click"/>
</toolkit:ContextMenu>
</toolkit:ContextMenuService.ContextMenu>
</Border>
</DataTemplate>
</phone:PhoneApplicationPage.Resources>
...
<phone:LongListSelector x:Name="Recent" Margin="0"
Style="{StaticResource MyLongListSelectorStyle}"
SelectionChanged="recent_SelectionChanged"
toolkit:TiltEffect.IsTiltEnabled="True"
LayoutMode="Grid" GridCellSize="108,108"
ItemTemplate="{StaticResource ItemTemplate}"
/>
应用程序.xaml
<Style x:Key="MyLongListSelectorStyle" TargetType="phone:LongListSelector" >
<!--<Setter Property="LayoutMode" Value="List"/>-->
<Setter Property="LayoutMode" Value="Grid"/>
<!--<Setter Property="FontFamily" Value="Times New Roman"/>-->
<Setter Property="ItemTemplate">
<Setter.Value>
<DataTemplate>
<UserControl>
<Border x:Name="MyBorder" Background="Transparent">
<VisualStateManager.VisualStateGroups >
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal" />
<VisualState x:Name="Selected">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background)" Storyboard.TargetName="MyBorder">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneAccentBrush}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<!--<StackPanel>
<TextBlock x:Name="textBlock" Text="{Binding}" TextWrapping="Wrap" Style="{StaticResource PhoneTextSubtleStyle}"/>
</StackPanel>-->
</Border>
</UserControl>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
MainPage.xaml.cs
private void recent_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
var s = sender as LongListSelector;
var item = (sender as LongListSelector).SelectedItem;
if (item == null)
return;
// Get item of LongListSelector.
List<UserControl> listItems = new List<UserControl>();
GetItemsRecursive<UserControl>(Recent, ref listItems);
// Selected.
if (e.AddedItems.Count > 0 && e.AddedItems[0] != null)
{
foreach (UserControl userControl in listItems)
{
if (e.AddedItems[0].Equals(userControl.DataContext))
{
VisualStateManager.GoToState(userControl, "Selected", true);
}
}
}
// Unselected.
if (e.RemovedItems.Count > 0 && e.RemovedItems[0] != null)
{
foreach (UserControl userControl in listItems)
{
if (e.RemovedItems[0].Equals(userControl.DataContext))
{
VisualStateManager.GoToState(userControl, "Normal", true);
}
}
}
}
public static void GetItemsRecursive<T>(DependencyObject parents, ref List<T> objectList) where T : DependencyObject
{
var childrenCount = VisualTreeHelper.GetChildrenCount(parents);
for (int i = 0; i < childrenCount; i++)
{
var child = VisualTreeHelper.GetChild(parents, i);
if (child is T)
{
objectList.Add(child as T);
}
GetItemsRecursive<T>(child, ref objectList);
}
return;
}
我被困在从这里做什么，有什么想法吗？
编辑** 稍微改变了实现，但仍然无法正常工作。
主页.xaml
<phone:PhoneApplicationPage.Resources>
<Style x:Key="MyLongListSelectorStyle" TargetType="phone:LongListSelector" >
<!--<Setter Property="LayoutMode" Value="List"/>-->
<Setter Property="LayoutMode" Value="Grid"/>
<!--<Setter Property="FontFamily" Value="Times New Roman"/>-->
<Setter Property="ItemTemplate">
<Setter.Value>
<DataTemplate>
<UserControl>
<!--<Border x:Name="MyBorder" Background="Transparent">-->
<Border x:Name="MyBorder" Background="Transparent">
<VisualStateManager.VisualStateGroups >
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal" />
<VisualState x:Name="Selected">
<Storyboard>
<!--<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(Panel.Background)" Storyboard.TargetName="MyBorder">-->
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderThickness" Storyboard.TargetName="brd">
<DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneAccentBrush}"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Border x:Name="brd" CornerRadius="10" Width="Auto" BorderThickness="3">
<!--<Border x:Name="brd" CornerRadius="10" Width="Auto" BorderThickness="3">-->
<Viewbox Width="108" Height="108">
<Image x:Name="recentImage" Source="{Binding Source}" Margin="6,6" Width="108"/>
</Viewbox>
<toolkit:ContextMenuService.ContextMenu>
<toolkit:ContextMenu x:Name="imgListContextMenu" Background="{StaticResource PhoneChromeBrush}">
<toolkit:MenuItem Foreground="{StaticResource PhoneForegroundBrush}" Header="edit" Click="editContextMenuItem_Click"/>
<toolkit:MenuItem Foreground="{StaticResource PhoneForegroundBrush}" Header="favorite" Click="favoriteContextMenuItem_Click"/>
<toolkit:MenuItem Foreground="{StaticResource PhoneForegroundBrush}" Header="delete" Click="deleteContextMenuItem_Click"/>
</toolkit:ContextMenu>
</toolkit:ContextMenuService.ContextMenu>
</Border>
<!--<StackPanel>
<TextBlock x:Name="textBlock" Text="{Binding}" TextWrapping="Wrap" Style="{StaticResource PhoneTextSubtleStyle}"/>
</StackPanel>-->
</Border>
</UserControl>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
</phone:PhoneApplicationPage.Resources>
...
<phone:LongListSelector x:Name="Recent" Margin="0"
Style="{StaticResource MyLongListSelectorStyle}"
SelectionChanged="recent_SelectionChanged"
toolkit:TiltEffect.IsTiltEnabled="True"
LayoutMode="Grid" GridCellSize="108,108"
/>
MainPage.xaml.cs
//remains the same
