private LocalRenderCallInfo GetOrCreateParameterCallback(CefV8Context context, MethodDescriptor methodDescriptor, IV8Callback callback)
{
LocalRenderCallInfo parameterCallbackInfo = null;
if (methodDescriptor.HasCallbackParameter && callback != null)
{
// Create a second stored callback info which represents the V8 callback function itself
// rather than the method that is being invoked now. This allows the callback function
// to be passed to and invoked by multiple native methods that accept a callback parameter.
parameterCallbackInfo = (LocalRenderCallInfo)_pendingCallbacks.Get(callback.Identifier);
if (parameterCallbackInfo == null)
{
var parameterCallbackMessage = new PluginMessage
{
MessageId = callback.Identifier,
MessageType = PluginMessageType.ParameterCallback,
PluginId = string.Empty,
MemberName = string.Empty,
BrowserId = context.GetBrowserId(),
ContextId = GetIdForContext(context, false),
FrameId = context.GetFrame().Identifier,
V8CallbackId = Guid.Empty
};
parameterCallbackInfo = AddLocalCallback(parameterCallbackMessage, callback, null);
}
}
return(parameterCallbackInfo);
}
private PluginMessage CreateMessage(
CefV8Context context,
PluginDescriptor targetPlugin,
string memberName,
IV8Callback callback)
{
var message = new PluginMessage
{
PluginId = targetPlugin.PluginId,
MemberName = memberName,
BrowserId = context.GetBrowserId(),
ContextId = GetIdForContext(context, false),
FrameId = context.GetFrame().Identifier,
V8CallbackId = callback != null ? callback.Identifier : Guid.Empty
};
return(message);
}