在启动时突出显示SelectedItem

Question

I'm trying to highlight (with changing the background) SelectedItem in the collection on start-up. I have a data template to define the items. I can use a border to set the background. In the moment the highlight is done when an item is selected.

<DataTemplate.Triggers>                       
    <DataTrigger Binding="{Binding Path=IsSelected, RelativeSource={RelativeSource FindAncestor, AncestorType=syncfusion:CarouselItem}}" Value="True">
       <Setter TargetName="border" Property="Background" Value="Red"/>
   </DataTrigger>
</DataTemplate.Triggers>

But because on start-up the SelectedItem is already active, it seems logic to be also highlighted.

Answer 1

Have you tried just selecting an item in the collection to ensure that one is selected? You could declare a property of the type of the items that populate the collection to data bind to the ItemsControl.SelectedItem property. Then in your code behind, or view model, you can do this (assuming your collection control is data bound to a data collection named Items :

<ListBox ItemsSource="{Binding Items}" SelectedItem="{Binding SelectedItem}" ... />

...

Items = FillCollectionWithItems();
if (Items.Count > 0) SelectedItem = Items[0];

Answer 2

My first thought would be the item is Selected, but not Focused, and the system color for selected but not focused is usually a really light gray that's hard to see.

You could try ensuring that the item has Focus on load if this is the case, or overwrite the system colors for the control.

Here's an example that overwrites the InactiveSelectionHighlightBrush color for a control:

<SomeControl.Resources>
    <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrush}" Color="Red"/>
</SomeControl.Resources>