Why my WPF animation starts just once?

Question

I have an animation that works fine the first time it is triggered, but when the GoNextCmdis raising to true a second time, the animation doesn't start anymore. Here is my code :

<ItemsControl DockPanel.Dock="Top" ItemsSource="{Binding ViewCollection}" x:Name="itemsControl">

    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <StackPanel Orientation="Horizontal"></StackPanel>
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>

    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <ContentControl Content="{Binding}" Width="500" Name="toMove">
            </ContentControl>
        </DataTemplate>
    </ItemsControl.ItemTemplate>

    <ItemsControl.Style>
        <Style TargetType="ItemsControl">
            <Style.Triggers>
                <DataTrigger Binding="{Binding GoNextCmd}" Value="true">
                    <DataTrigger.EnterActions>
                        <BeginStoryboard>
                            <Storyboard>
                                <ThicknessAnimation RepeatBehavior="1x" FillBehavior="Stop" Storyboard.TargetProperty="Margin" By="-250,0,0,0" Duration="0:0:1">
                                    <ThicknessAnimation.EasingFunction>
                                        <QuinticEase EasingMode="EaseInOut" />
                                    </ThicknessAnimation.EasingFunction>
                                </ThicknessAnimation>                               
                            </Storyboard>
                        </BeginStoryboard>
                    </DataTrigger.EnterActions>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </ItemsControl.Style>

</ItemsControl>

Does somebody knows something about it?

Did you try it in a clean project? It works fine for me and animation is triggered each time property value is set to true — dkozl
I tried it but it still doesn't work. What is the code you have tested it with? — bobby4078
I've tested your control with simple view model that implements INotifyPropertyChanged which has some simple ViewCollection list and bool GoNextCmd property — dkozl
Hum it seems to be the same that my code... is there a way you can show me your view model code and xaml? — bobby4078
There is really not much of a code to show. One ObservableCollection<string> list property and one bool property. which I change when button is clicked, and INotifyPropertyChanged implementation + your XAML. — dkozl

wade wade · Accepted Answer · 2014-05-15T14:25:33

I am not sure what you mean by the command rising to true but with DataTriggers you should be using properties using INotifyPropertyChanged (and rising PropertyChanged when the setter is used).

Why my WPF animation starts just once?

1 Answers