Add @bind-Value to all Parameters

[TimPurdum]

Using the Code Generator, add the {ParameterName}Changed Parameter to all current non-EventCallback parameters. This exposes 2-way binding to end users, who can then use @bind-ParameterName="_localVariable" to bind.

Example:

public class DistanceMeasurement2DWidget: Widget
{

...

    // existing parameter
    [Parameter]
    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
    public DistanceMeasurement2DViewModel? ViewModel { get; set; }

    // new parameter
    [Parameter]
    [JsonIgnore]
    public EventCallback<DistanceMeasurement2DViewModel> ViewModelChanged { get; set; }
}

Usage:

<MapView>
  <Map>
  </Map>
  <DistanceMeasurement2DWidget @ref="_distanceWidget" 
                                     Visible="false" 
                                     Position="OverlayPosition.BottomRight"
                                     @bind-ViewModel="_distanceWidgetViewModel"
                                     @bind-ViewModel:after="StateHasChanged" />
</MapView>