Qfyilyi

I'm working with WPF with Prism (MVVM), and trying to build an Inspector for a few classes. One of those classes is Vector3:

<Grid x:Name="Vector3Root" Background="White">

    <StackPanel Orientation="Horizontal">

        <StackPanel Orientation="Horizontal">

            <xctk:DoubleUpDown Tag="X" Style="{StaticResource DoubleUpDownStyle}" Value="{Binding X}" ValueChanged="Vector3ValueChanged"/>

        </StackPanel>

        <StackPanel Orientation="Horizontal">

            <xctk:DoubleUpDown Tag="Y" Style="{StaticResource DoubleUpDownStyle}" Value="{Binding Y}" ValueChanged="Vector3ValueChanged"/>

        </StackPanel>

        <StackPanel Orientation="Horizontal">

            <xctk:DoubleUpDown Tag="Z" Style="{StaticResource DoubleUpDownStyle}" Value="{Binding Z}" ValueChanged="Vector3ValueChanged"/>

        </StackPanel>

    </StackPanel>

</Grid>

And its code-behind

namespace SimROV.WPF.Views{

public partial class Vector3View : UserControl

{

    public Vector3View()

    {

        InitializeComponent();

    }



    public static readonly RoutedEvent SettingConfirmedEvent =

        EventManager.RegisterRoutedEvent("SettingConfirmed", RoutingStrategy.Bubble,

        typeof(RoutedEventHandler), typeof(Vector3View));



    public event RoutedEventHandler SettingConfirmed

    {

        add { AddHandler(SettingConfirmedEvent, value); }

        remove { RemoveHandler(SettingConfirmedEvent, value); }

    }



    public void Vector3ValueChanged(object sender, RoutedPropertyChangedEventArgs<object> e)

    {

        RaiseEvent(new RoutedEventArgs(SettingConfirmedEvent));

    }

}}

The problem that I'm struggling with is that I can't catch neither of the fired events (ValueChanged or SettingConfirmed) on another UserControl's ViewModel that is using Vector3View:

<UserControl

         x:Class="SimROV.WPF.Views.TransformView"

         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 

         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 

         xmlns:views="clr-namespace:SimROV.WPF.Views"

         xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"

         xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"

         xmlns:prism="http://prismlibrary.com/"



mc:Ignorable="d" >



<Grid x:Name="TransformRoot" Background="White">

    <StackPanel Orientation="Vertical">

        <StackPanel Orientation="Horizontal">

            <TextBlock Text="Position" Margin="5"/>

            <!--<ContentPresenter ContentTemplate="{StaticResource Vector3Template}"/>-->

            <views:Vector3View x:Name="PositionVector3">

                <i:Interaction.Triggers>

                    <i:EventTrigger EventName="SettingConfirmed">

                        <prism:InvokeCommandAction Command="{Binding PositionValueChangedCommand}"/>

                    </i:EventTrigger>

                </i:Interaction.Triggers>

            </views:Vector3View>

        </StackPanel>

        <StackPanel Orientation="Horizontal">

            <TextBlock Text="Rotation" Margin="5"/>

            <!--<ContentPresenter ContentTemplate="{StaticResource Vector3Template}"/>-->

            <views:Vector3View x:Name="RotationVector3" SettingConfirmed="RotationValueChangedEvent"/>

        </StackPanel>

    </StackPanel>

</Grid>

At this point I CAN catch SettingConfirmed with RotationValueChangedEvent on code-behind, but since I'm following MVVM pattern, that doesn't work for me, which is why I'm using EventTrigger and InvokeCommandAction to catch those events on TransformViewModel, but those never get fired.
Here it's the TransformViewModel:

namespace SimROV.WPF.ViewModels{

public class TransformViewModel : BindableBase

{

    private ICommand _positionCommand;



    public ICommand PositionValueChangedCommand => this._positionCommand ?? (this._positionCommand = new DelegateCommand(PositionChanged));

    private void PositionChanged()

    {



    }

    public TransformViewModel()

    {



    }

}}

PositionChanged just never gets fired and I can't understand why at all.

I don't know if this is relevant, but Transform is an element of an ObservableCollection<IComponent> at another ViewModel, which is being presented by a ListView with a ItemContainerStyle, that has a ContentPresenter with a ContentTemplateSelector inside.

Can someone point me out on why this is happening and how to fix it?

Thank you.

Your EventTrigger and InvokeCommandAction should work just fine provided that the DataContext of the Vector3View actually is a TransformViewModel so the binding to the PositionValueChangedCommand property succeeds.