ObservableValidator in .NET MAUI Toolkit - doc for EventTriggerBehavior?

Question

In the .NET MAUI Community Toolkit MVVM samples there is this XAML:

<Grid>
        <muxc:InfoBar
            x:Name="SuccessInfoBar"
            Title="Success"
            Message="The form was filled in correctly."
            Severity="Success">
            <interactivity:Interaction.Behaviors>
                <interactions:EventTriggerBehavior EventName="FormSubmissionCompleted" SourceObject="{x:Bind ViewModel}">
                    <interactions:ChangePropertyAction
                        PropertyName="IsOpen"
                        TargetObject="{x:Bind SuccessInfoBar}"
                        Value="True" />
                    <interactions:ChangePropertyAction
                        PropertyName="IsOpen"
                        TargetObject="{x:Bind FailureInfoBar}"
                        Value="False" />
                </interactions:EventTriggerBehavior>
            </interactivity:Interaction.Behaviors>
        </muxc:InfoBar>

Can you tell me where I find documentation on EventTriggerBehavior? Or for that matter, where I find interactivity and Interaction.Behaviors and ChangePropertyAction?

I don't see this documented, despite searching.

Also, while I have you, this same code says

SourceObject="{x:Bind ViewModel}

Is Bind the same things as Binding?

Answer 1

EventTriggerBehavior: Listens for a specific event on its source and executes an action when the event is fired, it has two configurable properties (EventName and SourceObject).

ChangePropertyAction: Action that will change a specified property to a specified value when invoked.

For more information about Behaviors, you can check the documentation: XamlBehaviors

Regarding Bind and Binding, the {x:Bind} markup extension official document explains:

The {x:Bind} markup extension—new for Windows 10—is an alternative to {Binding}. {x:Bind} runs in less time and less memory than {Binding} and supports better debugging.

The difference to note is that the default mode of {x:Bind} is OneTime, which is different from {Binding}, whose default mode is OneWay.

For a comprehensive comparison between {x:Bind} and {Binding}, you can read Data binding in depth.