Connected.Components/Components/Popover/PopoverProvider.razor.cs

// Copyright (c) MudBlazor 2021
// MudBlazor licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using Microsoft.AspNetCore.Components;

namespace Connected.Components;

public partial class PopoverProvider : IDisposable
{
   private bool _isConnectedToService = false;

   [Inject] public IPopoverService Service { get; set; }

   /// <summary>
   /// In some scenarios we need more than one ThemeProvider but we must not have more than one
   /// PopoverProvider. Set a cascading value with UsePopoverProvider=false to prevent it.
   /// </summary>
   [CascadingParameter(Name = "UsePopoverProvider")]
   public bool IsEnabled { get; set; } = true;


   public void Dispose()
   {
      Service.FragmentsChanged -= Service_FragmentsChanged;
   }

   protected override void OnInitialized()
   {
      if (IsEnabled == false)
      {
         return;
      }

      Service.FragmentsChanged += Service_FragmentsChanged;
      _isConnectedToService = true;
   }

   protected override void OnParametersSet()
   {
      base.OnParametersSet();

      if (IsEnabled == false && _isConnectedToService == true)
      {
         Service.FragmentsChanged -= Service_FragmentsChanged;
         _isConnectedToService = false;
      }
      else if (IsEnabled == true && _isConnectedToService == false)
      {
         Service.FragmentsChanged -= Service_FragmentsChanged; // make sure to avoid multiple registration
         Service.FragmentsChanged += Service_FragmentsChanged;
         _isConnectedToService = true;
      }
   }

   protected override async Task OnAfterRenderAsync(bool firstRender)
   {
      if (firstRender && IsEnabled && Service.ThrowOnDuplicateProvider)
      {
         await Service.InitializeIfNeeded();
         if (await Service.CountProviders() > 1)
         {
            throw new InvalidOperationException("Duplicate MudPopoverProvider detected. Please ensure there is only one provider, or disable this warning with PopoverOptions.ThrowOnDuplicateProvider.");
         }
      }
      await base.OnAfterRenderAsync(firstRender);
   }

   private void Service_FragmentsChanged(object sender, EventArgs e)
   {
      InvokeAsync(StateHasChanged);
   }

}