Factor out wxGenericProgressDialog::EnsureActiveEventLoopExists()

Make this function reusable in order to allow it to be called from the
native MSW wxProgressDialog implementation in the upcoming commit.

include/wx/generic/progdlgg.h

@@ -105,6 +105,9 @@ protected:
     // Converts seconds to HH:mm:ss format.
     static wxString GetFormattedTime(unsigned long timeInSec);
 
+    // Create a new event loop if there is no currently running one.
+    void EnsureActiveEventLoopExists();
+
     // callback for optional abort button
     void OnCancel(wxCommandEvent&);
 

src/generic/progdlgg.cpp

@@ -160,11 +160,7 @@ bool wxGenericProgressDialog::Create( const wxString& title,
     // even if this means we have to start it ourselves (this happens most
     // commonly during the program initialization, e.g. for the progress
     // dialogs shown from overridden wxApp::OnInit()).
-    if ( !wxEventLoopBase::GetActive() )
+    EnsureActiveEventLoopExists();
-    {
-        m_tempEventLoop = new wxEventLoop;
-        wxEventLoop::SetActive(m_tempEventLoop);
-    }
 
 #if defined(__WXMSW__) && !defined(__WXUNIVERSAL__)
     // we have to remove the "Close" button from the title bar then as it is
@@ -363,6 +359,15 @@ wxString wxGenericProgressDialog::GetFormattedTime(unsigned long timeInSec)
     return timeAsHMS;
 }
 
+void wxGenericProgressDialog::EnsureActiveEventLoopExists()
+{
+    if ( !wxEventLoopBase::GetActive() )
+    {
+        m_tempEventLoop = new wxEventLoop;
+        wxEventLoop::SetActive(m_tempEventLoop);
+    }
+}
+
 wxStaticText *
 wxGenericProgressDialog::CreateLabel(const wxString& text, wxSizer *sizer)
 {