Wpf listviewitem style not overriding default behavior

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I have a ListView control and I'm trying to create a style to; color alternating rows, which works, color the rows when hovering and selecting.

The hovering and selecting is the problem, the default behavior does not allow me to change the colors.

XML

<ListView Name="AttachmentListView" Margin="2 5 0 10"
          MaxHeight="360"
          ItemsSource="{Binding Path=AttachmentView}"
          SelectedItem="{Binding SelectedAttachment}">
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="MouseDoubleClick">
            <i:InvokeCommandAction Command="{Binding AttachmentTabToolbarClickCommand}"
                     CommandParameter="{Binding ElementName=AttachmentListView, Path=SelectedItem}" />
        </i:EventTrigger>
    </i:Interaction.Triggers>
    <ListView.ItemTemplate>
        <DataTemplate>
            <Grid Margin="10">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*"/>
                    <ColumnDefinition Width="32"/>
                </Grid.ColumnDefinitions>
                <StackPanel TextElement.FontFamily="Monserrat" TextElement.FontSize="14">
                    <StackPanel Orientation="Horizontal">
                        <TextBlock VerticalAlignment="Center"
                                   Text="[ Attachment Type: "/>
                        <TextBlock VerticalAlignment="Center"
                                   Text="{Binding AttachmentType}" Foreground="{DynamicResource MahApps.Brushes.Text}"/>
                        <TextBlock Text=" ] "/>
                        <TextBlock VerticalAlignment="Center"
                                   Text="    < Description: "/>
                        <TextBlock VerticalAlignment="Center"
                                   Text="{Binding Description}" Foreground="{DynamicResource MahApps.Brushes.Text}"/>
                        <TextBlock Text=" > "/>
                    </StackPanel>
                    <TextBlock Name="filetb" FontWeight="Bold" Text="{Binding Path=Filename}" Foreground="{DynamicResource MahApps.Brushes.Text}"/>
                </StackPanel>
            </Grid>
        </DataTemplate>
    </ListView.ItemTemplate>
    <ListView.ItemContainerStyle>
        <Style TargetType="ListViewItem">
            <Setter Property="BorderBrush" Value="#b1b0a3"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Style.Triggers>
                <Trigger Property="ItemsControl.AlternationIndex"  Value="0">
                    <Setter Property="Background" Value="#d8d7d1" />
                </Trigger>
                <Trigger Property="ItemsControl.AlternationIndex"  Value="1">
                    <Setter Property="Background" Value="#ecebe8" />
                </Trigger>
                <Trigger Property="IsMouseOver" Value="true">
                    <Setter Property="Background" Value="#b1b0a3"/>
                </Trigger>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="Background" Value="#b1b0a3"/>
                </Trigger>
            </Style.Triggers>
        </Style>
    </ListView.ItemContainerStyle>
</ListView>

What I have tried:

I'm thinking it can be solved using a control template but I'm not sure how to implement. I've attempted a few different variations but had no luck, the ListView failed to display the items when I tried.

Any help appreciated.

Posted 31-Mar-24 11:00am

Mike Hankey

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Comments

Jo_vb.net 31-Mar-24 17:59pm

Are you sure your resource dictionary is being included properly?
In App.xml ?

Mike Hankey 31-Mar-24 18:05pm

Yes, I've been searching for some time on this problem and finally found the answer. Ended up it was a ControlTemplate problem, as I thought and it is working now. Thanks for the feedback.

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Graeme_Grant · Accepted Answer · 2024-03-31T13:27:00

AlternationIndex and IsSelected are both properties of a ListViewItem, so a standard Style.Trigger will not work.

You need to use a MultiTrigger Class (System.Windows) | Microsoft Learn[^]. Examples are provided with that link, however here is how I would use it (untested):

XML

<MultiTrigger>
	<MultiTrigger.Conditions>
	   <Condition Property="IsSelected" Value="True"/>
	   <Condition Property="ItemsControl.AlternationIndex" Value="0"/>
	</MultiTrigger.Conditions>
	<Setter Property="Background" Value="LightGreen"/>
 </MultiTrigger>
 <MultiTrigger>
	<MultiTrigger.Conditions>
	   <Condition Property="IsSelected" Value="True"/>
	   <Condition Property="ItemsControl.AlternationIndex"
				  Value="1"/>
	</MultiTrigger.Conditions>
	<Setter Property="Background" Value="LightBlue"/>
 </MultiTrigger>

Enjoy!