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Simplify UriHelper by making EnableNavigationInteception automatic

This commit is contained in:
Steve Sanderson 2018-02-23 09:59:56 +00:00
parent e1aab02228
commit 68f6ede3a7
2 changed files with 31 additions and 15 deletions
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4
src/Microsoft.AspNetCore.Blazor.Browser/Routing/BrowserRouter.cs
View File

@ -44,11 +44,9 @@ namespace Microsoft.AspNetCore.Blazor.Browser.Routing
public void Init(RenderHandle renderHandle)
{
_renderHandle = renderHandle;
UriHelper.EnableNavigationInteception();
UriHelper.OnLocationChanged += OnLocationChanged;
_baseUriPrefix = UriHelper.GetBaseUriPrefix();
_locationAbsolute = UriHelper.GetAbsoluteUri();
UriHelper.OnLocationChanged += OnLocationChanged;
}
/// <inheritdoc />

42
src/Microsoft.AspNetCore.Blazor.Browser/Routing/UriHelper.cs
View File

@ -7,8 +7,6 @@ using System;
namespace Microsoft.AspNetCore.Blazor.Browser.Routing
{
// TODO: Make this not static, and wrap it in an interface that can be injected through DI.
// We can make EnableNavigationInteception private, and call it automatically when the any
// concrete instance is instantiated.
/// <summary>
/// Helpers for working with URIs and navigation state.
@ -19,19 +17,26 @@ namespace Microsoft.AspNetCore.Blazor.Browser.Routing
static string _currentAbsoluteUri;
static string _baseUriString;
static Uri _baseUri;
static EventHandler<string> _onLocationChanged;
static bool _hasEnabledNavigationInterception;
/// <summary>
/// An event that fires when the navigation location has changed.
/// </summary>
public static event EventHandler<string> OnLocationChanged;
/// <summary>
/// Prevents default navigation on all links whose href is inside the base URI space,
/// causing clicks on those links to trigger <see cref="OnLocationChanged"/> instead.
/// </summary>
public static void EnableNavigationInteception()
=> RegisteredFunction.InvokeUnmarshalled<object>(
$"{_functionPrefix}.enableNavigationInteception");
public static event EventHandler<string> OnLocationChanged
{
add
{
EnsureNavigationInteceptionEnabled();
_onLocationChanged += value;
}
remove
{
// We could consider deactivating the JS-side enableNavigationInteception
// if there are no remaining listeners, but we don't need that currently.
_onLocationChanged -= value;
}
}
/// <summary>
/// Gets the URI prefix that can be prepended before URI paths to produce an absolute URI.
@ -115,7 +120,20 @@ namespace Microsoft.AspNetCore.Blazor.Browser.Routing
private static void NotifyLocationChanged(string newAbsoluteUri)
{
_currentAbsoluteUri = newAbsoluteUri;
OnLocationChanged?.Invoke(null, newAbsoluteUri);
_onLocationChanged?.Invoke(null, newAbsoluteUri);
}
private static void EnsureNavigationInteceptionEnabled()
{
// Don't need thread safety because:
// (1) there's only one UI thread
// (2) doesn't matter if we call enableNavigationInteception more than once anyway
if (!_hasEnabledNavigationInterception)
{
_hasEnabledNavigationInterception = true;
RegisteredFunction.InvokeUnmarshalled<object>(
$"{_functionPrefix}.enableNavigationInteception");
}
}
/// <summary>