Remotely/Server/Components/LoaderHarness.razor

@using Nihs.SimpleMessenger;
@using Remotely.Server.Models.Messages;
@inject IMessenger Messenger

@if (_loaderShown)
{
    <LoadingSignal StatusMessage="@_statusMessage" />
}

@code {
    private bool _loaderShown;
    private string _statusMessage = string.Empty;

    protected override Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
        {
            Messenger.Register<ShowLoaderMessage>(this, HandleShowLoaderMessage);
        }
        return base.OnAfterRenderAsync(firstRender);
    }

    private async Task HandleShowLoaderMessage(ShowLoaderMessage message)
    {
        _loaderShown = message.IsShown;
        _statusMessage = message.StatusMessage;
        await InvokeAsync(StateHasChanged);
    }
}