XAML separate binding of ContainerStyle and ContentTemplate in ListBox

Question

I tried this for a while now and searched in the web without success... Now I dare to ask on stackoverflow myself.

So, the aim is to separate the definitions of the ItemContainerStyle and the ContentTemplate of a ListBoxItem. I have defined the ListBoxItemStyle in a ResourceDictionary and two different DataTemplates in the Window.Resources.

I now like to set the style of the ListBoxItem according to the one defined in the ResourceDictionary and change the DataTemplate with a trigger (IsMouseOver).

My (not working) Code so fare looks like this:

<ListBox HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="20,60,10,10"
         Grid.Row="1" Grid.Column="0"
         PreviewMouseMove="DragMove_PreviewMouseMove"
         PreviewMouseLeftButtonDown="Drag_PreviewMouseLeftButtonDown"
         ItemsSource="{Binding Persons}" VerticalContentAlignment="Center"
         Style="{StaticResource DefaultListBoxStyle}">
    <ListBox.ItemContainerStyle>
        <Style TargetType="ListBoxItem">
            <Setter Property="Style" Value="{StaticResource DefaultListBoxItemStyle}"/>
            <Setter Property="ContentTemplate" Value="{StaticResource PersonsListBoxItemTemplate_default}"/>
            <Style.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Setter Property="ContentTemplate" Value="{StaticResource PersonsListBoxItemTemplate_infoButtons}"/>
                </Trigger>
            </Style.Triggers>
        </Style>
    </ListBox.ItemContainerStyle>
</ListBox>

where DefaultListBoxStyle is the style defined in the ResourceDictionary and PersonsListBoxItemTemplate_default & PersonsListBoxItemTemplate_infoButtons are the DataTemplates defined in the Window.Resources.

Now I get an error, that the style-object must not have an impact on the style-property of the object it belongs to.

I tried different ways, but without success... I also tried to define the style first and then change the template, but it does not work either.

Thank you all for your help!

What exactly are you trying to achieve (you've only stated how as far as I understand). Is it different than this question: http://stackoverflow.com/questions/19296531/datatrigger-not-changing-template-in-itemcontainerstyle-for-listbox?rq=1 ? — o_weisman, Sep 05 '16 at 07:36
So, the difference is, that I'd like to use a style defined in the ResourceDirectory which other ListBoxes use too. And with the trigger i'd like to only change the DataTemplate. The part which does not work is to set the Style... It should be somehow like in the code above. (Was this clearer...?) — Matroid, Sep 05 '16 at 07:49
@Fabian Thx! I thought, it should be that easy! Could you write it as answer, such that I can accept it? — Matroid, Sep 05 '16 at 07:59

score 1 · Accepted Answer · answered Sep 05 '16 at 08:10

1

So you can't set Style Property in Style with Setter. For this you need to use BasedOn:

<Style TargetType="ListBoxItem" BasedOn="{StaticResource DefaultListBoxItemStyle}">
    <Setter ... />
</Style>

answered Sep 05 '16 at 08:10

WPFGermany

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XAML separate binding of ContainerStyle and ContentTemplate in ListBox

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