public async Task <string> ExecuteScriptAsync(string script)
{
var taskResult = new TaskCompletionSource <string>();
var id = Guid.NewGuid();
GAsyncReadyDelegate callback = (IntPtr webview, IntPtr asyncResult, IntPtr userdata) =>
{
try
{
taskResult.SetResult(ExecuteScriptCallback(webview, asyncResult, userdata));
}
catch (Exception ex)
{
taskResult.SetException(ex);
}
};
scriptCallbacks.TryAdd(id, callback);
using (GLibString gfunction = script)
{
WebKit.JavaScript.BeginExecute(Handle, gfunction, IntPtr.Zero, callback, IntPtr.Zero);
}
// found no other solution than the ConccurentDictionary one to keep the callbacks from getting garbage collected
// GC.KeepAlive(callback) works not all the time
var result = await taskResult.Task;
scriptCallbacks.TryRemove(id, out var _);
return(result);
}
public GtkWebview(WebviewBridge bridge)
{
this.bridge = bridge ?? throw new ArgumentNullException(nameof(bridge));
// need to keep the delegates around or they will get garbage collected
scriptDelegate = ScriptCallback;
loadFailedDelegate = LoadFailedCallback;
loadDelegate = LoadCallback;
contextMenuDelegate = ContextMenuCallback;
closeDelegate = CloseCallback;
titleChangeDelegate = TitleChangeCallback;
uriSchemeCallback = UriSchemeCallback;
scriptExecuteCallback = ScriptExecuteCallback;
manager = WebKit.Manager.Create();
GLib.ConnectSignal(manager, "script-message-received::external", scriptDelegate, IntPtr.Zero);
using (GLibString name = "external")
{
WebKit.Manager.RegisterScriptMessageHandler(manager, name);
}
Handle = WebKit.CreateWithUserContentManager(manager);
settings = WebKit.Settings.Get(Handle);
inspector = WebKit.Inspector.Get(Handle);
GLib.ConnectSignal(Handle, "load-failed", loadFailedDelegate, IntPtr.Zero);
GLib.ConnectSignal(Handle, "load-changed", loadDelegate, IntPtr.Zero);
GLib.ConnectSignal(Handle, "context-menu", contextMenuDelegate, IntPtr.Zero);
GLib.ConnectSignal(Handle, "close", closeDelegate, IntPtr.Zero);
GLib.ConnectSignal(Handle, "notify::title", titleChangeDelegate, IntPtr.Zero);
const string scheme = "spidereye";
customHost = new Uri(UriTools.GetRandomResourceUrl(scheme));
IntPtr context = WebKit.Context.Get(Handle);
using GLibString gscheme = scheme;
WebKit.Context.RegisterUriScheme(context, gscheme, uriSchemeCallback, IntPtr.Zero, IntPtr.Zero);
}
public static extern void BeginExecute(IntPtr webview, IntPtr js, IntPtr cancellable, GAsyncReadyDelegate callback, IntPtr user_data);
