Adding wxEvtHandler to wxApp at runtime

[Volker Bartheld]

Hi!

Depending on some command line arguments, my application performs different
tasks. Some very basic events are handled at wxApp-level. I thought about
deriving two classes from wxEvtHandler

class Task1 : public wxEvtHandler;
class Task2 : public wxEvtHandler;

and adding either one or the other to the event handler chain of

class MyApp : public wxApp

at runtime using wxEvtHandler::SetNextHandler of MyApp but didn't have much
success so far. Is that a good way to solve the problem?

Another option would be to forward a selection of event types in MyApp to
either Task1 or Task2 using

DEFINE_EVENT_TYPE(EVT_TASK)
DECLARE_EVENT_TYPE(EVT_TASK, -1)
BEGIN_EVENT_TABLE(MyApp,wxApp)
EVT_COMMAND(wxID_ANY, EVT_TASK, MyApp::OnTaskEvent)
END_EVENT_TABLE()
MyApp::OnTaskEvent(wxCommandEvent &evt)
{
  if(bTask1) m_Task1.AddPendingEvent(evt);
  else       m_Task2.AddPendingEvent(evt);
}

etc. but this seems a bit clumsy especially if there are many EVT_TASK-like
events.

Since only classes derived from wxWindow have wxWindow::PushEventHandler(),
I could also create a (hidden) main window, class TaskWin : public
wxWindow; in MyApp that gets Task1 or Task2 pushed in. Would that work?

Thanks in advance for some insights!


Volker

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