showing event of child control from parent Topic is solved

[NoeMurr]

Hi all,

I have a custom control class, that is derived from wxControl and that is composed by some other standard control (I can't post the original code becouse it is too long and complex so, I will write an example):

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...
class MyControl : public wxControl {
	wxTextCtrl *text;
	wxButton *btn;
	
public:
	MyControl(...) : wxControl(...) {
		auto *sizer = new wxBoxSizer(wxVERTICAL);
		btn = new wxButton(this, wxID_ANY, _T("btn"));
		text = new wxTextCtrl(...);
		sizer->Add(text);
		sizer->Add(btn);
		
		SetMainSizer(sizer);
		
		btn->Bind(wxEVT_BUTTON, &MyControl::onBtnClick, this);
	}
	
	void onBtnClick(wxCommandEvent &e) {
		// todo
	}
}
...

In the todo section I want to fire a custom event that can be catched from outside the control e.g.:

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...
	MyControl *myCtrl = new MyControl(...);
	myCtrl->Bind(MY_EVT, [](MyCoolEvt &e){
		std::cout << e->GetMyData() << std::endl;
	});
...

Does someone know how should I do it?

[ONEEYEMAN]

Hi,
Did you look at the event sample?

Thank you.

[NoeMurr]

I did, it is very complex but I think I found the way.. Can you tell me if I'm wrong at some point?

1) I should create an event class (that inherits from wxEvent);
2) I should decleare the event with:

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wxDEFINE_EVENT(MY_EVT, MyEvtClass);

3) in my todo section I should create the event and fire it using ProcessWindowEvent() function:

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...
    MyEvtClass evt(MY_EVT, GetId());
    evt.SetEventObject(this);
    ProcessWindowEvent(event);
...

4) when I need to handle the event I should do something like:

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...
MyControl *myCtrl = new MyControl(...);
myCtrl->Bind(MY_EVT, [](MyEvtClass &e){
      	std::cout << "Yeah! that's my event" << std::endl;
});
...

[doublemax]

You only need to define a new event class when you need to transport more information than an integer and a string. Otherwise just defining a new event type is enough.

But if you define a new class, you must derive from wxCommandEvent. Only these propagate upwards in the window hierarchy.

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MyEvtClass evt(MY_EVT, GetId());

This is a common mistake that will not cause a compiler error, but lots of grey hair. The first parameter is the id, then the event type.

[NoeMurr]

Thank you! I have to transport a custom data so I need the class.