Make using non-wxControl-derived wxGrid editors really work

While feacaf8714 changed the API to allow
using any wxWindow (and not only a window of a wxControl-derived class)
as the associated window of the grid editor, actually doing resulted in
an immediate crash due to dereferencing a null pointer in wxGrid code
which still expected to have a wxControl.

Fix this by replacing all calls to wxGridCellEditor::GetControl() inside
wxGrid with wxGridCellEditor::GetWindow(), to ensure that a non-null
editor window is used even in this case.

Closes https://github.com/wxWidgets/wxWidgets/pull/1509

src/generic/grid.cpp

@@ -2774,7 +2774,7 @@ void wxGrid::CalcDimensions()
         // how big is the editor
         wxGridCellAttr* attr = GetCellAttr(r, c);
         wxGridCellEditor* editor = attr->GetEditor(this, r, c);
-        editor->GetControl()->GetSize(&w2, &h2);
+        editor->GetWindow()->GetSize(&w2, &h2);
         w2 += x;
         h2 += y;
         if ( w2 > w )
@@ -6877,7 +6877,7 @@ bool wxGrid::IsCellEditControlShown() const
         {
             if ( editor->IsCreated() )
             {
-                isShown = editor->GetControl()->IsShown();
+                isShown = editor->GetWindow()->IsShown();
             }
 
             editor->DecRef();
@@ -6959,13 +6959,13 @@ void wxGrid::ShowCellEditControl()
                                              this,
                                              row,
                                              col,
-                                             editor->GetControl());
+                                             editor->GetWindow());
                 GetEventHandler()->ProcessEvent(evt);
             }
-            else if ( editor->GetControl() &&
-                      editor->GetControl()->GetParent() != gridWindow )
+            else if ( editor->GetWindow() &&
+                      editor->GetWindow()->GetParent() != gridWindow )
             {
-                editor->GetControl()->Reparent(gridWindow);
+                editor->GetWindow()->Reparent(gridWindow);
             }
 
             // resize editor to overflow into righthand cells if allowed
@@ -7009,9 +7009,9 @@ void wxGrid::ShowCellEditControl()
             editor->SetCellAttr( attr );
             editor->SetSize( rect );
             if (nXMove != 0)
-                editor->GetControl()->Move(
-                    editor->GetControl()->GetPosition().x + nXMove,
-                    editor->GetControl()->GetPosition().y );
+                editor->GetWindow()->Move(
+                    editor->GetWindow()->GetPosition().x + nXMove,
+                    editor->GetWindow()->GetPosition().y );
             editor->Show( true, attr );
 
             // recalc dimensions in case we need to
@@ -7036,10 +7036,10 @@ void wxGrid::HideCellEditControl()
 
         wxGridCellAttr *attr = GetCellAttr(row, col);
         wxGridCellEditor *editor = attr->GetEditor(this, row, col);
-        const bool editorHadFocus = editor->GetControl()->HasFocus();
+        const bool editorHadFocus = editor->GetWindow()->HasFocus();
 
-        if ( editor->GetControl()->GetParent() != m_gridWin )
-            editor->GetControl()->Reparent(m_gridWin);
+        if ( editor->GetWindow()->GetParent() != m_gridWin )
+            editor->GetWindow()->Reparent(m_gridWin);
 
         editor->Show( false );
         editor->DecRef();

tests/controls/gridtest.cpp

@@ -74,6 +74,7 @@ private:
         NONGTK_TEST( LabelClick );
         NONGTK_TEST( SortClick );
         CPPUNIT_TEST( ColumnOrder );
+        WXUISIM_TEST( WindowAsEditorControl );
     CPPUNIT_TEST_SUITE_END();
 
     void CellEdit();
@@ -95,6 +96,7 @@ private:
     void CellFormatting();
     void Editable();
     void ReadOnly();
+    void WindowAsEditorControl();
     void PseudoTest_NativeHeader() { ms_nativeheader = true; }
     void PseudoTest_NativeLabels() { ms_nativeheader = false;
                                      ms_nativelabels = true; }
@@ -742,4 +744,66 @@ void GridTestCase::ReadOnly()
 #endif
 }
 
+void GridTestCase::WindowAsEditorControl()
+{
+#if wxUSE_UIACTIONSIMULATOR
+    // A very simple editor using a window not derived from wxControl as the
+    // editor.
+    class TestEditor : public wxGridCellEditor
+    {
+    public:
+        TestEditor() {}
+
+        void Create(wxWindow* parent,
+                    wxWindowID id,
+                    wxEvtHandler* evtHandler) wxOVERRIDE
+        {
+            SetWindow(new wxWindow(parent, id));
+            wxGridCellEditor::Create(parent, id, evtHandler);
+        }
+
+        void BeginEdit(int, int, wxGrid*) wxOVERRIDE {}
+
+        bool EndEdit(int, int, wxGrid const*, wxString const&,
+                     wxString* newval) wxOVERRIDE
+        {
+            *newval = GetValue();
+            return true;
+        }
+
+        void ApplyEdit(int row, int col, wxGrid* grid) wxOVERRIDE
+        {
+            grid->GetTable()->SetValue(row, col, GetValue());
+        }
+
+        void Reset() wxOVERRIDE {}
+
+        wxGridCellEditor* Clone() const wxOVERRIDE { return new TestEditor(); }
+
+        wxString GetValue() const wxOVERRIDE { return "value"; }
+
+        wxDECLARE_NO_COPY_CLASS(TestEditor);
+    };
+
+    wxGridCellAttr* attr = new wxGridCellAttr();
+    attr->SetRenderer(new wxGridCellStringRenderer());
+    attr->SetEditor(new TestEditor());
+    m_grid->SetAttr(1, 1, attr);
+
+    EventCounter created(m_grid, wxEVT_GRID_EDITOR_CREATED);
+
+    wxUIActionSimulator sim;
+
+    m_grid->SetFocus();
+    m_grid->SetGridCursor(1, 1);
+    m_grid->EnableCellEditControl();
+
+    sim.Char(WXK_RETURN);
+
+    wxYield();
+
+    CPPUNIT_ASSERT_EQUAL(1, created.GetCount());
+#endif
+}
+
 #endif //wxUSE_GRID