private Task <InteropHandshakeResult> AttachInteropAsync()
{
var resultTcs = new TaskCompletionSource <InteropHandshakeResult>();
// These hacks can go away once there's a proper IPC channel for event notifications etc.
var selfAsDotNetObjectReference = typeof(DotNetObjectReference).GetMethod(nameof(DotNetObjectReference.Create))
.MakeGenericMethod(GetType())
.Invoke(null, new[] { this });
var selfAsDotnetObjectReferenceId = (long)typeof(JSRuntime).GetMethod("TrackObjectReference", BindingFlags.NonPublic | BindingFlags.Instance)
.MakeGenericMethod(GetType())
.Invoke(_jsRuntime, new[] { selfAsDotNetObjectReference });
_ipc.Once("components:init", args =>
{
var argsArray = (object[])args;
var initialUriAbsolute = ((JsonElement)argsArray[0]).GetString();
var baseUriAbsolute = ((JsonElement)argsArray[1]).GetString();
resultTcs.TrySetResult(new InteropHandshakeResult(baseUriAbsolute, initialUriAbsolute));
});
_ipc.On("BeginInvokeDotNetFromJS", args =>
{
var argsArray = (object[])args;
var assemblyName = argsArray[1] != null ? ((JsonElement)argsArray[1]).GetString() : null;
var methodIdentifier = ((JsonElement)argsArray[2]).GetString();
var dotNetObjectId = ((JsonElement)argsArray[3]).GetInt64();
var callId = ((JsonElement)argsArray[0]).GetString();
var argsJson = ((JsonElement)argsArray[4]).GetString();
// As a temporary hack, intercept blazor.desktop.js's JS interop calls for event notifications,
// and direct them to our own instance. This is to avoid needing a static BlazorHybridRenderer.Instance.
// Similar temporary hack for navigation notifications
// TODO: Change blazor.desktop.js to use a dedicated IPC call for these calls, not JS interop.
if (assemblyName == "Microsoft.MobileBlazorBindings.WebView")
{
assemblyName = null;
dotNetObjectId = selfAsDotnetObjectReferenceId;
}
DotNetDispatcher.BeginInvokeDotNet(
_jsRuntime,
new DotNetInvocationInfo(assemblyName, methodIdentifier, dotNetObjectId, callId),
argsJson);
});
_ipc.On("EndInvokeJSFromDotNet", args =>
{
var argsArray = (object[])args;
DotNetDispatcher.EndInvokeJS(
_jsRuntime,
((JsonElement)argsArray[2]).GetString());
});
_webView.Source = new XF.UrlWebViewSource {
Url = $"{BlazorAppScheme}://0.0.0.0/"
};
return(resultTcs.Task);
}