Question

I am trying to use the TiltEffect from the Silverlight toolkit within a LongListSelector. This is how the element is declared in XAML:

<controls:PivotItem Header="Pivot Item">

  <controls:PivotItem.Resources>

    <DataTemplate x:Key="LongListSelectorGroupHeaderTemplate">
      <Border Background="{StaticResource PhoneAccentBrush}"
              Margin="10,20,0,0"
              HorizontalAlignment="Left"
              VerticalAlignment="Center"
              Height="{StaticResource PhoneFontSizeExtraExtraLarge}"
              Width="{StaticResource PhoneFontSizeExtraExtraLarge}">
        <TextBlock Text="{Binding Name}"
                   Style="{StaticResource PhoneTextExtraLargeStyle}"
                   Foreground="White"
                   VerticalAlignment="Bottom"
                   HorizontalAlignment="Left" />
      </Border>
    </DataTemplate>

    <DataTemplate x:Key="LongListSelectorGroupItemTemplate">
      <Border Background="{StaticResource PhoneAccentBrush}"
              Margin="10"
              Height="{StaticResource PhoneFontSizeExtraExtraLarge}"
              Width="{StaticResource PhoneFontSizeExtraExtraLarge}">
        <TextBlock Text="{Binding Name}"
                   Style="{StaticResource PhoneTextExtraLargeStyle}"
                   Foreground="White"
                   VerticalAlignment="Bottom"
                   HorizontalAlignment="Left" />
      </Border>
    </DataTemplate>

    <DataTemplate x:Key="LongListSelectorItemTemplate">
      <StackPanel Grid.Column="1"
                  VerticalAlignment="Top"
                  Orientation="Horizontal"
                  toolkit:TiltEffect.IsTiltEnabled="True">

        <toolkit:GestureService.GestureListener>
          <toolkit:GestureListener Tap="OnLongListSelectorTapped" />
        </toolkit:GestureService.GestureListener>

        <Image  Source="{Binding ImageSource}"
                MinHeight="32"
                MinWidth="32"
                MaxHeight="48"
                MaxWidth="48" />

        <TextBlock Text="{Binding Name}"
                   Style="{StaticResource PhoneTextExtraLargeStyle}"
                   Margin="12,10,12,0" />

      </StackPanel>
    </DataTemplate>

  </controls:PivotItem.Resources>

  <toolkit:LongListSelector ItemTemplate="{StaticResource LongListSelectorItemTemplate}"
                            GroupHeaderTemplate="{StaticResource LongListSelectorGroupHeaderTemplate}"
                            GroupItemTemplate="{StaticResource LongListSelectorGroupItemTemplate}">

    <toolkit:LongListSelector.GroupItemsPanel>
      <ItemsPanelTemplate>
        <toolkit:WrapPanel />
      </ItemsPanelTemplate>
    </toolkit:LongListSelector.GroupItemsPanel>

  </toolkit:LongListSelector>

</controls:PivotItem>

Unfortunately, this isn’t working. The tap gesture fires when tapping on an item, but the animation does not play. I’ve tried setting TiltEffect.IsTiltEnabled property on the LongListSelector, the PivotItem and the parent page but none of them work.

I have another PivotItem that contains a simple ListBox with an ItemTemplate that is very similar to LongListSelectorItemTemplate above. Setting the TiltEffect.IsTiltEnabled property to true within its DataTemplate works as desired.

What am I doing wrong in the case of the LongListSelector?

Answer 1

If you wrap your ItemTemplate in a ListBoxItem, it will tilt accordingly:

<DataTemplate x:Key="LongListSelectorItemTemplate">
  <ListBoxItem>
    <StackPanel Grid.Column="1"
                VerticalAlignment="Top"
                Orientation="Horizontal"
                toolkit:TiltEffect.IsTiltEnabled="True">

      <toolkit:GestureService.GestureListener>
        <toolkit:GestureListener Tap="OnLongListSelectorTapped" />
      </toolkit:GestureService.GestureListener>

      <Image  Source="{Binding ImageSource}"
              MinHeight="32"
              MinWidth="32"
              MaxHeight="48"
              MaxWidth="48" />

      <TextBlock Text="{Binding Name}"
                 Style="{StaticResource PhoneTextExtraLargeStyle}"
                 Margin="12,10,12,0" />
    </StackPanel>
  </ListBoxItem>
</DataTemplate>