Question

A relative n00b to WPF. I have a ListView thus:

<ListView>
    <ListView.View>
        <GridView>
            ...
        </GridView>
    </ListView.View>
    <ListView.Resources>
        <Style TargetType="{x:Type ListViewItem}">
            <EventSetter Event="MouseDoubleClick" Handler="ItemDoubleClick"/>
        </Style>
    </ListView.Resources>
</ListView>

And in my app.xaml I have the following styles:

<Style TargetType="{x:Type ListView}">
    <Setter Property="ItemContainerStyle" Value="{DynamicResource ListViewItemStyle}"/>
</Style>
<Style x:Key="ListViewItemStyle" TargetType="{x:Type ListViewItem}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="ListViewItem">
                <Border x:Name="Border" Padding="4">
                    <GridViewRowPresenter x:Name="ItemText" 
                                          TextBlock.FontSize="14" TextBlock.Foreground="{x:Static SystemColors.ControlDarkDarkBrush}"
                                          VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
                </Border>

                <ControlTemplate.Triggers>
                    <MultiTrigger>
                        <MultiTrigger.Conditions>
                            <Condition Property="IsMouseOver" Value="True"/>
                            <Condition Property="IsSelected" Value="False"/>
                        </MultiTrigger.Conditions>

                        <Setter TargetName="ItemText" Property="TextBlock.Foreground" Value="{x:Static SystemColors.WindowTextBrush}"/>
                    </MultiTrigger>

                    <Trigger Property="IsSelected" Value="True">
                        <Setter TargetName="Border" Property="Background" Value="{x:Static SystemColors.HighlightBrush}"/>
                        <Setter TargetName="ItemText" Property="TextBlock.Foreground" Value="{x:Static SystemColors.HighlightTextBrush}"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

But once I’m setting the ItemContainerStyle, the double-click no longer fires. If I remove it, it fires but my ListViewItems are not styled.

What am I missing here?

Answer 1

Your local resource is overridden by the application resources style which changes the ListView’s ItemContainerStyle property. I would suggest setting the style directly on the ListView.ItemContainerStyle and basing the style on the existing one:

<ListView.ItemContainerStyle>
    <Style TargetType="{x:Type ListViewItem}"
           BasedOn="{StaticResource {x:Type ListViewItem}}">
        <EventSetter Event="MouseDoubleClick" Handler="ItemDoubleClick"/>
    </Style>
</ListView.ItemContainerStyle>

(This assumes implicit styling, so either remove the key of the style in your application resources or reference it directly using that key in the BasedOn property)