Hello,
I encounter problems with an animation in a datatemplate in a listviewitem when virtualization is used. The Animation works fine as Long as I do not scroll up or down. If I start to scroll up or doewn, the Animation is jumping to another ListviewItem
... This Problem occurs when e.g. VirtualizingStackPanel is used, if no virtualization is used, everything works fine. Following some code snippets ... How can I fix my Problem when virtualization is used?
XAML:
...
<ListView.ItemsPanel>
<ItemsPanelTemplate>
<VirtualizingStackPanel />
</ItemsPanelTemplate>
</ListView.ItemsPanel>
<ListView.ItemTemplate>
<DataTemplate>
<Grid x:Name="GridConvItem" >
<Grid.ColumnDefinitions>
<ColumnDefinition Width="10" />
<ColumnDefinition Width="1*" />
...
<Grid x:Name="AnimationGridConv" Grid.Column="2" Grid.RowSpan="2">
<Grid.Resources>
<Storyboard x:Name="Storyboard1">
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Visibility)" Storyboard.TargetName="cani" RepeatBehavior="1x">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Visible</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
<DiscreteObjectKeyFrame KeyTime="0:0:35">
<DiscreteObjectKeyFrame.Value>
<Visibility>Collapsed</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
....
</Storyboard>
</Grid.Resources>
<Image Source="{Binding Image}" Height="50" Width="50" />
<Canvas x:Name="cani" Width="50" Height="12" VerticalAlignment="Bottom" Margin="0,0,0,6" Background="Black" Opacity="0.6"
Visibility="Collapsed" >
<Grid>
....
Code:
// ListView conv
ItemContainerGenerator generator = conv.ItemContainerGenerator;
ListViewItem selectedItem = (ListViewItem)generator.ContainerFromIndex(i);
if (selectedItem != null)
{
Grid tbFind = Helpers.GetDescendantByType(selectedItem, typeof(Grid), "AnimationGridConv") as Grid;
Storyboard typingAnimation = (Storyboard)tbFind.Resources["Storyboard1"];
typingAnimation.Begin();
....
