Interaction DataTrigger doesn't work. Could anyone test this example. Perhaps I'm doing something wrong.

cron kropjc 41 Reputation points
2020-04-17T11:18:04.82+00:00

Hello everyone,
here's a simplest code the purpose of which is animation launching from ViewModel.
Some people claim that it is working code.
There are not any mistakes. exceptions and it doesn't work.
Could anyone test this example. perhaps I'm doing something wrong?

Note:
it's used wide known interactivity and interaction libraries. Be sure if you had performed a reference to them.
Also it's used MVVM light framework. It doesn't matter. You can create the Property by standard way with INPC.

Thanks for advance!

XAML

<Window
    x:Class="Ellipse.Move.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
    xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
    xmlns:local="clr-namespace:Ellipse.Move"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:vm="clr-namespace:Ellipse.Move.ViewModel"
    Title="MainWindow"
    Width="525"
    Height="350"
    mc:Ignorable="d">

    <Window.DataContext>
        <vm:MainViewModel />
    </Window.DataContext>

    <Grid>

        <Canvas
            Name="CanvasWrapper"
            Width="525"
            Height="350">
            <Ellipse
                Canvas.Left="10"
                Canvas.Top="10"
                Width="60"
                Height="60"
                Fill="Red">
                <Ellipse.Resources>
                    <Storyboard x:Key="Movement">
                        <DoubleAnimation
                            Storyboard.TargetProperty="(Canvas.Left)"
                            To="440"
                            Duration="0:0:02" />
                        <DoubleAnimation
                            Storyboard.TargetProperty="(Canvas.Top)"
                            To="250"
                            Duration="0:0:02" />
                    </Storyboard>
                </Ellipse.Resources>

                <!--  This trigger is just for testing and works fine!  -->
                <Ellipse.Triggers>
                    <EventTrigger RoutedEvent="Ellipse.MouseEnter">
                        <EventTrigger.Actions>
                            <BeginStoryboard Storyboard="{StaticResource Movement}" />
                        </EventTrigger.Actions>
                    </EventTrigger>
                </Ellipse.Triggers>

                <!--  This trigger doesn't works  -->
                <i:Interaction.Triggers>
                    <ei:DataTrigger Binding="{Binding Move}" Value="true">
                        <ei:ControlStoryboardAction ControlStoryboardOption="Play" Storyboard="{StaticResource Movement}" />
                    </ei:DataTrigger>
                </i:Interaction.Triggers>
            </Ellipse>
        </Canvas>

    </Grid>
</Window>

ViewModel

using GalaSoft.MvvmLight;

namespace Ellipse.Move.ViewModel
{

    public class MainViewModel : ViewModelBase
    {

        // Property definition
        public const string MyPropertyPropertyName = "Move";

        private bool _move = true;

        public bool Move
        {
            get
            {
                return _move;
            }

            set
            {
                if (_move == value)
                {
                    return;
                }

                _move = value;
                RaisePropertyChanged(MyPropertyPropertyName);
            }
        }



        public MainViewModel()
        {




        }
Windows Presentation Foundation
Windows Presentation Foundation
A part of the .NET Framework that provides a unified programming model for building line-of-business desktop applications on Windows.
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Accepted answer
  1. Peter Fleischer (former MVP) 19,326 Reputation points
    2020-04-17T19:45:09.843+00:00

    Hi, you must set the Storyboard.TargetName. Try following demo, check the CheckBox.

    <Window x:Class="WpfApp1.Window30"
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
            xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
            xmlns:local="clr-namespace:WpfApp30"
            xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
            xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
            mc:Ignorable="d"
            Title="Window30" Height="450" Width="800">
      <Window.DataContext>
        <local:MainViewModel />
      </Window.DataContext>
      <Grid>
        <Canvas
                 Name="CanvasWrapper"
                 Width="525"
                 Height="350">
          <Ellipse x:Name="MyEllipse"
                     Canvas.Left="10"
                     Canvas.Top="10"
                     Width="60"
                     Height="60"
                     Fill="Red">
            <Ellipse.Resources>
              <Storyboard x:Key="Movement">
                <DoubleAnimation Storyboard.TargetName="MyEllipse"
                                 Storyboard.TargetProperty="(Canvas.Left)"
                                 To="440"
                                 Duration="0:0:02" />
                <DoubleAnimation Storyboard.TargetName="MyEllipse"
                                 Storyboard.TargetProperty="(Canvas.Top)"
                                 To="250"
                                 Duration="0:0:02" />
              </Storyboard>
            </Ellipse.Resources>
            <!--  This trigger works, if you set Storyboard.TargetName -->
            <i:Interaction.Triggers>
              <ei:DataTrigger Binding="{Binding Move}" Value="true">
                <ei:ControlStoryboardAction ControlStoryboardOption="Play" Storyboard="{StaticResource Movement}"/>
              </ei:DataTrigger>
            </i:Interaction.Triggers>
          </Ellipse>
        </Canvas>
        <CheckBox IsChecked="{Binding Move, Mode=TwoWay}"/>
      </Grid>
    </Window>
    

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