Replace a single function with a class in Enter processing tests

No real changes yet, this is a pure refactoring before the upcoming
changes.

tests/controls/comboboxtest.cpp

@@ -233,9 +233,10 @@ void ComboBoxTestCase::IsEmpty()
 
 TEST_CASE("wxComboBox::ProcessEnter", "[wxComboBox][enter]")
 {
-    struct ComboBoxCreator
+    class ComboBoxCreator : public TextLikeControlCreator
     {
-        static wxControl* Do(wxWindow* parent, int style)
+    public:
+        virtual wxControl* Create(wxWindow* parent, int style) const wxOVERRIDE
         {
             const wxString choices[] = { "foo", "bar", "baz" };
 
@@ -246,7 +247,7 @@ TEST_CASE("wxComboBox::ProcessEnter", "[wxComboBox][enter]")
         }
     };
 
-    TestProcessEnter(&ComboBoxCreator::Do);
+    TestProcessEnter(ComboBoxCreator());
 }
 
 #endif //wxUSE_COMBOBOX

tests/controls/textctrltest.cpp

@@ -1271,9 +1271,14 @@ void TextCtrlTestCase::XYToPositionSingleLine()
 
 TEST_CASE("wxTextCtrl::ProcessEnter", "[wxTextCtrl][enter]")
 {
-    struct TextCtrlCreator
+    class TextCtrlCreator : public TextLikeControlCreator
     {
-        static wxControl* Do(wxWindow* parent, int style)
+    public:
+        explicit TextCtrlCreator()
+        {
+        }
+
+        virtual wxControl* Create(wxWindow* parent, int style) const wxOVERRIDE
         {
             return new wxTextCtrl(parent, wxID_ANY, wxString(),
                                   wxDefaultPosition, wxDefaultSize,
@@ -1281,7 +1286,7 @@ TEST_CASE("wxTextCtrl::ProcessEnter", "[wxTextCtrl][enter]")
         }
     };
 
-    TestProcessEnter(&TextCtrlCreator::Do);
+    TestProcessEnter(TextCtrlCreator());
 }
 
 #endif //wxUSE_TEXTCTRL

tests/controls/textentrytest.cpp

@@ -384,13 +384,17 @@ enum ProcessEnter
 class TestDialog : public wxDialog
 {
 public:
-    explicit TestDialog(TextLikeControlCreator controlCreator,
+    explicit TestDialog(const TextLikeControlCreator& controlCreator,
                         ProcessEnter processEnter)
         : wxDialog(wxTheApp->GetTopWindow(), wxID_ANY, "Test dialog"),
-          m_control((*controlCreator)(this,
-                                      processEnter == ProcessEnter_No
-                                        ? 0
-                                        : wxTE_PROCESS_ENTER)),
+          m_control
+          (
+              controlCreator.Create
+              (
+               this,
+               processEnter == ProcessEnter_No ? 0 : wxTE_PROCESS_ENTER
+              )
+          ),
           m_processEnter(processEnter),
           m_gotEnter(false)
     {
@@ -455,7 +459,7 @@ private:
 
 } // anonymous namespace
 
-void TestProcessEnter(TextLikeControlCreator controlCreator)
+void TestProcessEnter(const TextLikeControlCreator& controlCreator)
 {
     if ( !EnableUITests() )
     {
@@ -487,7 +491,7 @@ void TestProcessEnter(TextLikeControlCreator controlCreator)
 
 #else // !wxUSE_UIACTIONSIMULATOR
 
-void TestProcessEnter(TextLikeControlCreator WXUNUSED(controlCreator))
+void TestProcessEnter(const TextLikeControlCreator& WXUNUSED(controlCreator))
 {
     WARN("Skipping wxTE_PROCESS_ENTER tests: wxUIActionSimulator not available");
 }

tests/controls/textentrytest.h

@@ -75,11 +75,27 @@ private:
     wxDECLARE_NO_COPY_CLASS(TextEntryTestCase);
 };
 
-// Function to call to test that wxTE_PROCESS_ENTER is handled correctly for
-// the controls of the type created by the given creator function when they're
-// placed in a dialog with a default button.
-typedef wxControl* (*TextLikeControlCreator)(wxWindow* parent, int style);
+// Helper used for creating the control of the specific type (currently either
+// wxTextCtrl or wxComboBox) with the given flag.
+class TextLikeControlCreator
+{
+public:
+    TextLikeControlCreator() {}
 
-void TestProcessEnter(TextLikeControlCreator controlCreator);
+    // Create the control of the right type using the given parent and style.
+    virtual wxControl* Create(wxWindow* parent, int style) const = 0;
+
+    // Give it a virtual dtor to avoid warnings even though this class is not
+    // supposed to be used polymorphically.
+    virtual ~TextLikeControlCreator() {}
+
+private:
+    wxDECLARE_NO_COPY_CLASS(TextLikeControlCreator);
+};
+
+// Use the given control creator to check that various combinations of
+// specifying and not specifying wxTE_PROCESS_ENTER and handling or not
+// handling the resulting event work as expected.
+void TestProcessEnter(const TextLikeControlCreator& controlCreator);
 
 #endif // _WX_TESTS_CONTROLS_TEXTENTRYTEST_H_