WebPage.connectUserMessageReceived

gulong connectUserMessageReceived(T)(T callback,  Flag!"After" after =  No.After) if (isCallable!T
    &&  is(ReturnType!T ==  bool)
   && (Parameters!T.length <  1 || (ParameterStorageClassTuple!T[0]  ==  ParameterStorageClass.none &&  is(Parameters!T[0] :  webkitwebprocessextension.user_message.UserMessage)))
   && (Parameters!T.length <  2 || (ParameterStorageClassTuple!T[1]  ==  ParameterStorageClass.none &&  is(Parameters!T[1] :  webkitwebprocessextension.web_page.WebPage)))
   &&  Parameters!T.length <  3)

Connect to UserMessageReceived signal.

This signal is emitted when a #WebKitUserMessage is received from the #WebKitWebView corresponding to web_page. You can reply to the message using [webkitwebprocessextension.user_message.UserMessage.sendReply].

You can handle the user message asynchronously by calling [gobject.object.ObjectWrap.ref_] on message and returning true. If the last reference of message is removed and the message has been replied, the operation in the #WebKitWebView will finish with error [webkit.types.UserMessageError.Message].

Parameters

`callback`	signal callback delegate or function to connect `bool callback(webkitwebprocessextension.user_message.UserMessage message, webkitwebprocessextension.web_page.WebPage webPage)` `message` the #WebKitUserMessage received (optional) `webPage` the instance the signal is connected to (optional) `Returns` true if the message was handled, or false otherwise.
`after`	Yes.After to execute callback after default handler, No.After to execute before (default)

Returns

Signal ID