Selected item loses style when focus moved out in

问题:

What do I have?

I have a ListBox populated with items from an XML file. Given a DynamicResource for Style property and written trigger for IsSelected in ItemContainerStyle.

What do I want to do?

I want to keep the selected Item highlighted even after focus moved out of the ListBox.

What problem am I facing?

When I select an item the style specified in IsSelected trigger works. But, when I move the focus out of list box (press tab or click on some other control) the selected item loses its style. Is there any way so that I can retain the selected item style?

Thanks in advance!

回答1:

If you're only setting the background color, try replacing ControlBrush for the ListBox, as per this answer.

回答2:

The answer referenced will in some cases solve the problem, but is not ideal as it breaks when the control is disabled/readonly and it also overrides the color schemes, rather than taking advantage of them. My suggestion is to add the following in the ListBox tags:

<ListBox....>
    <ListBox.Resources>
            <Style TargetType="ListBoxItem">
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="ListBoxItem">
                            <Border Name="Border" Padding="2" SnapsToDevicePixels="true">
                                <ContentPresenter />
                            </Border>
                            <ControlTemplate.Triggers>
                                <Trigger Property="IsSelected" Value="true">
                                    <Setter TargetName="Border" Property="Background"
                                            Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                                </Trigger>
                            </ControlTemplate.Triggers>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
        </Style>
    </ListBox.Resources>
</ListBox>

What this will do is set the Highlight background color on the list box item whenever it is selected (regardless of the control state).

My answer is based on help from the answers already given to these answers, along with the following blog: http://blogs.vbcity.com/xtab/archive/2009/06/29/9344.aspx