Forums | NoesisGUI

Posted: **28 Dec 2016, 13:15**

v1.2 allows to register events with NsFunc macro, but it's no longer supported in reflection macros.
I can't understand how can I manual register event for next control:

<CheckBox Name="CheckBox1" Checked="CheckBox1_Checked"/>

Can you give me solution for C++?

Posted: **28 Dec 2016, 15:14**

In v1.3 we are in the process of generating code for automatic event registering, the same way WPF does when you build the project and it generates a "????.g.cs" file with a partial implementation of your code behind root class.

In 1.3 beta3 you still have to do it manually by getting a reference to the named control:

void OnPostInit()
{
  CheckBox* cb = FindName<CheckBox>("CheckBox1");
  cb->Checked() += MakeDelegate(this, &MyUserControl::CheckBox1_Checked);
  //...
}

For the upcoming 1.3 beta4 we are preparing now, we will provide an overrideable funtion in the FrameworkElement that will alllow you to register events even on unnamed controls, in a way more similar how WPF does:

void Connect(BaseComponent* source, const NsChar* eventName, const NsChar* handlerName) override
{
  if (String::Compare(eventName, "Checked") == 0 && String::Compare(handlerName, "CheckBox1_Checked") == 0)
  {
    CheckBox* element = NsStaticCast<CheckBox*>(source);
    element->Checked() += MakeDelegate(this, &MyUserControl::CheckBox1_Checked);
  }
}

In the final version we want to provide a tool that will generate that code automatically for you.

Posted: **28 Dec 2016, 15:31**

Thanks for your reply. Can you provide me header of handler function?

void CheckBox1_Checked(Core::BaseComponent*, const EventArgs&){/*...*/}

Produce error:

Error C2440	'<function-style-cast>': cannot convert from 'Noesis::Core::Delegate<void (Noesis::Core::BaseComponent *,const Noesis::Gui::RoutedEventArgs &)>::{ctor}::ERROR_INSUFFICIENT_SIZE' to 'Noesis::Core::CompileTimeChecker<false>'

Posted: **28 Dec 2016, 16:22**

The signature of the event handler should be:

#include <NoesisGUI.h>

//...

void CheckBox1_Checked(Noesis::BaseComponent* sender, const Noesis::RoutedEventArgs& args)
{
 //...
}

Posted: **29 Dec 2016, 06:59**

Thanks. Works for me now.

Posted: **29 Dec 2016, 16:21**

Error C2440	'<function-style-cast>': cannot convert from 'Noesis::Core::Delegate<void (Noesis::Core::BaseComponent *,const Noesis::Gui::RoutedEventArgs &)>::{ctor}::ERROR_INSUFFICIENT_SIZE' to 'Noesis::Core::CompileTimeChecker<false>'

This kind of alien errors when using delegates will also be fixed in the next beta. I am working right now in a tutorial explaining everything about manually registering events with Noesis.

Thanks for the feedback!

Posted: **03 Jan 2017, 02:15**

Just for the record, there is a new tutorial about events in the latest 1.3B4 version.

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[C++] Manual registering event in v1.3

[C++] Manual registering event in v1.3

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