hi。我遇到了在RadListBox
中拥有RadExpander
的问题。基本上,我完全有类似的东西。
我具有 OneWayToSource
绑定,但是我希望绑定仅在RadExpander
扩展而不是在倒塌时发生。
有什么方法可以有条件地绑定两个UI元素?
edit :(示例代码使某些下跌者感到高兴)
<DataTemplate x:Key="ListBoxItemTemplate" DataType="{x:Type telerik:RadListBoxItem}">
<!--<DataTemplate.Triggers>
<DataTrigger Binding="{Binding ElementName=listExpander, Path=IsExpanded, Mode=TwoWay}" Value="True">
<Setter Property="IsSelected" Value="True" />
</DataTrigger>
</DataTemplate.Triggers>-->
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<telerik:RadExpander x:Name="listExpander"
IsExpanded="{Binding Mode=TwoWay, IsAsync=True, Path=IsSelected, RelativeSource={RelativeSource AncestorType=telerik:RadListBoxItem, Mode=FindAncestor}}"
VerticalContentAlignment="Top" ToolTip="Double click on the List name to edit it">
<telerik:RadExpander.Header>
<Grid>
<TextBlock x:Name="listNameCaption" MouseDown="listName_txtblk_MouseDown"
Text="{Binding ListName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Style="{StaticResource HighlightedDetailsStyleForTextBlock}" />
<TextBox LostFocus="listName_txtbox_LostFocus" Visibility="Collapsed"
Text="{Binding ListName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
Style="{StaticResource HighlightedDetailsStyleForTextBox}" />
</Grid>
</telerik:RadExpander.Header>
<telerik:RadExpander.Content>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Border BorderBrush="#FFDADADA" BorderThickness="0,0,1,1" MinHeight="20" MinWidth="200" CornerRadius="3" Margin="5">
<Border BorderBrush="#B2ADBDD1" BorderThickness="1" CornerRadius="2">
<StackPanel>
<StackPanel Orientation="Horizontal">
<Label FontFamily="Segoe UI" FontSize="11" Content="List Type:" FontStyle="Italic" />
<Label FontFamily="Segoe UI" FontSize="11" Content="{Binding ListType}" />
</StackPanel>
<StackPanel Orientation="Horizontal">
<Label FontFamily="Segoe UI" FontSize="11" Content="Tree:" FontStyle="Italic" />
<Label FontFamily="Segoe UI" FontSize="11" Content="{Binding TreeName}" />
</StackPanel>
<StackPanel Orientation="Horizontal">
<Label FontFamily="Segoe UI" FontSize="11" Content="Discount Date:" FontStyle="Italic" />
<Label FontFamily="Segoe UI" FontSize="11" Content="{Binding DiscountDate}" />
</StackPanel>
</StackPanel>
</Border>
</Border>
</Grid>
</telerik:RadExpander.Content>
<!--<telerik:RadExpander.Style>
<Style TargetType="{x:Type telerik:RadExpander}">
<Style.Triggers>
<Trigger Property="IsExpanded" Value="True">
<Setter Property="{Binding RelativeSource={RelativeSource AncestorType=ListBoxItem, Mode=FindAncestor}, Path=IsSelected}" Value="True"/>
</Trigger>
</Style.Triggers>
</Style>
</telerik:RadExpander.Style>-->
</telerik:RadExpander>
</Grid>
</DataTemplate>
<telerik:RadListBox x:Name="allListBox"
Style="{StaticResource ListBoxStyle}"
ItemsSource="{Binding Lists, Mode=TwoWay}"
ItemTemplate="{StaticResource ListBoxItemTemplate}"
SelectedItem="{Binding SelectedListItem, Mode=TwoWay}">
<telerik:RadListBox.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel Orientation="Vertical" />
</ItemsPanelTemplate>
</telerik:RadListBox.ItemsPanel>
</telerik:RadListBox>
编辑2 :
修复了它,但是从后面的代码中进行了修复。希望有一种更干净的方式,我们只能说:" radexpander-您只有在您已经扩展了= true的情况下,您才能绑定到radlistboxitem的isseled属性。
这是工作代码:
private void ListItemExpanded(object sender, RadRoutedEventArgs e)
{
var listItem = sender as RadExpander;
if(listItem == null)
return;
if (!listItem.IsExpanded) return;
var parent = VisualTreeHelper.GetParent(listItem);
while (parent != null && !(parent is RadListBoxItem))
{
parent = VisualTreeHelper.GetParent(parent);
}
if(parent == null)
return;
var listBoxItem = parent as RadListBoxItem;
if (!listBoxItem.IsSelected)
listBoxItem.IsSelected = true;
}
和
<telerik:RadExpander x:Name="listExpander" Expanded="ListItemExpanded" VerticalContentAlignment="Top" ToolTip="Double click on the List name to edit it">
解决方案1.对扩展事件做出反应并通过代码更改元素的绑定。
解决方案2:使用多接头和iMultivalUeconverter:http://www.switchonthecode.com/tutorials/wpf-tutorial-using-using-using-susing-multibindings