protected override void OnContextCreated(CefBrowser browser, CefFrame frame, CefV8Context context)
{
if (frame.IsMain)
{
// Retrieve the context's window object and install the "cefReportDocumentSize" function
// used to tell the node about the document size.
using (var window = context.GetGlobal())
{
var handler = new CustomCallbackHandler(browser, frame);
var reportDocumentSizeFunc = CefV8Value.CreateFunction(CustomCallbackHandler.ReportDocumentSize, handler);
window.SetValue(CustomCallbackHandler.ReportDocumentSize, reportDocumentSizeFunc, CefV8PropertyAttribute.None);
}
}
base.OnContextCreated(browser, frame, context);
}
protected override void OnContextCreated(CefBrowser browser, CefFrame frame, CefV8Context context)
{
if (frame.IsMain)
{
// Retrieve the context's window object and install the "vvvvReportDocumentSize" function
// used to tell the node about the document size as well as the "vvvvSend" function
// used to tell the node about variables computed inside the frame.
using (var window = context.GetGlobal())
{
var handler = new CustomCallbackHandler(browser, frame);
var reportDocumentSizeFunc = CefV8Value.CreateFunction(CustomCallbackHandler.ReportDocumentSize, handler);
window.SetValue(CustomCallbackHandler.ReportDocumentSize, reportDocumentSizeFunc);
window.SetValue("vvvvQuery", CefV8Value.CreateFunction("vvvvQuery", new DelegatingHandler((name, obj, args) =>
{
const string argForm = "{ request: 'NAME', arguments: {}, onSuccess: function(response) {}, onError: function(error_message) {} }";
string invalidArg = $"vvvvQuery expects one argument of the form {argForm}";
if (args.Length != 1)
{
throw new Exception($"vvvvQuery expects one argument");
}
var x = args[0];
if (x is null || !x.IsObject)
{
throw new Exception($"The argument must be of the form {argForm}");
}
var requestValue = x.GetValue("request");
if (requestValue.IsUndefined)
{
throw new Exception($"The request entry is missing");
}
if (!requestValue.IsString)
{
throw new Exception($"The request must be a string");
}
var onSuccessValue = x.GetValue("onSuccess");
if (!onSuccessValue.IsUndefined && !onSuccessValue.IsFunction)
{
throw new Exception($"The onSuccess entry must be a function");
}
var onErrorValue = x.GetValue("onError");
if (!onErrorValue.IsUndefined && !onErrorValue.IsFunction)
{
throw new Exception($"The onError entry must be a function");
}
var request = requestValue.GetStringValue();
var id = queryCount++;
if (queries.TryAdd((request, id), (context, onSuccessValue, onErrorValue)))
{
using var message = CefProcessMessage.Create("query-request");
message.Arguments.SetString(0, request);
message.Arguments.SetInt(1, id);
message.Arguments.SetValue(2, ToValue(x.GetValue("arguments")));
frame.SendProcessMessage(CefProcessId.Browser, message);
}
return(default);
