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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Globalization;
using Microsoft.JSInterop;
namespace Microsoft.AspNetCore.Components.Routing;
/// <summary>
/// A component that can be used to intercept navigation events.
/// </summary>
public sealed class NavigationLock : IComponent, IHandleAfterRender, IAsyncDisposable
{
private readonly string _id = Guid.NewGuid().ToString("D", CultureInfo.InvariantCulture);
private RenderHandle _renderHandle;
private IDisposable? _locationChangingRegistration;
private bool _hasLocationChangingHandler;
private bool _confirmExternalNavigation;
private bool HasLocationChangingHandler => OnBeforeInternalNavigation.HasDelegate;
[Inject]
private IJSRuntime JSRuntime { get; set; } = default!;
[Inject]
private NavigationManager NavigationManager { get; set; } = default!;
/// <summary>
/// Gets or sets a callback to be invoked when an internal navigation event occurs.
/// </summary>
[Parameter]
public EventCallback<LocationChangingContext> OnBeforeInternalNavigation { get; set; }
/// <summary>
/// Gets or sets whether a browser dialog should prompt the user to either confirm or cancel
/// external navigations.
/// </summary>
[Parameter]
public bool ConfirmExternalNavigation { get; set; }
void IComponent.Attach(RenderHandle renderHandle)
{
_renderHandle = renderHandle;
}
Task IComponent.SetParametersAsync(ParameterView parameters)
{
foreach (var parameter in parameters)
{
if (parameter.Name.Equals(nameof(OnBeforeInternalNavigation), StringComparison.OrdinalIgnoreCase))
{
OnBeforeInternalNavigation = (EventCallback<LocationChangingContext>)parameter.Value;
}
else if (parameter.Name.Equals(nameof(ConfirmExternalNavigation), StringComparison.OrdinalIgnoreCase))
{
ConfirmExternalNavigation = (bool)parameter.Value;
}
else
{
throw new ArgumentException($"The component '{nameof(NavigationLock)}' does not accept a parameter with the name '{parameter.Name}'.");
}
}
if (_hasLocationChangingHandler != HasLocationChangingHandler ||
_confirmExternalNavigation != ConfirmExternalNavigation)
{
_renderHandle.Render(static builder => { });
}
return Task.CompletedTask;
}
async Task IHandleAfterRender.OnAfterRenderAsync()
{
if (_hasLocationChangingHandler != HasLocationChangingHandler)
{
_hasLocationChangingHandler = HasLocationChangingHandler;
_locationChangingRegistration?.Dispose();
_locationChangingRegistration = _hasLocationChangingHandler
? NavigationManager.RegisterLocationChangingHandler(OnLocationChanging)
: null;
}
if (_confirmExternalNavigation != ConfirmExternalNavigation)
{
_confirmExternalNavigation = ConfirmExternalNavigation;
if (_confirmExternalNavigation)
{
await JSRuntime.InvokeVoidAsync(NavigationLockInterop.EnableNavigationPrompt, _id);
}
else
{
await JSRuntime.InvokeVoidAsync(NavigationLockInterop.DisableNavigationPrompt, _id);
}
}
}
private async ValueTask OnLocationChanging(LocationChangingContext context)
{
await OnBeforeInternalNavigation.InvokeAsync(context);
}
async ValueTask IAsyncDisposable.DisposeAsync()
{
_locationChangingRegistration?.Dispose();
if (_confirmExternalNavigation)
{
try
{
await JSRuntime.InvokeVoidAsync(NavigationLockInterop.DisableNavigationPrompt, _id);
}
catch (JSDisconnectedException)
{
// If the browser is gone, we don't need it to clean up any browser-side state
}
}
}
}
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