]> git.saurik.com Git - wxWidgets.git/blobdiff - src/generic/grid.cpp
better guarding when no printing architecture exists (patch from Joel Low)
[wxWidgets.git] / src / generic / grid.cpp
index 4fe90672985d740bc244283dc3736f3c2abf9399..bdd93204b5472c16cfe3bd21581fc03d63bac969 100644 (file)
@@ -70,6 +70,37 @@ struct wxGridCellWithAttr
     wxGridCellWithAttr(int row, int col, wxGridCellAttr *attr_)
         : coords(row, col), attr(attr_)
     {
+        wxASSERT( attr );
+    }
+
+    wxGridCellWithAttr(const wxGridCellWithAttr& other)
+        : coords(other.coords),
+          attr(other.attr)
+    {
+        attr->IncRef();
+    }
+
+    wxGridCellWithAttr& operator=(const wxGridCellWithAttr& other)
+    {
+        coords = other.coords;
+        if (attr != other.attr)
+        {
+            attr->DecRef();
+            attr = other.attr;
+            attr->IncRef();
+        }
+        return *this;
+    }
+
+    void ChangeAttr(wxGridCellAttr* new_attr)
+    {
+        if (attr != new_attr)
+        {
+           // "Delete" (i.e. DecRef) the old attribute.
+            attr->DecRef();
+            attr = new_attr;
+            // Take ownership of the new attribute, i.e. no IncRef.
+        }
     }
 
     ~wxGridCellWithAttr()
@@ -79,10 +110,6 @@ struct wxGridCellWithAttr
 
     wxGridCellCoords coords;
     wxGridCellAttr  *attr;
-
-// Cannot do this:
-//  DECLARE_NO_COPY_CLASS(wxGridCellWithAttr)
-// without rewriting the macros, which require a public copy constructor.
 };
 
 WX_DECLARE_OBJARRAY_WITH_DECL(wxGridCellWithAttr, wxGridCellWithAttrArray,
@@ -120,22 +147,48 @@ DEFINE_EVENT_TYPE(wxEVT_GRID_EDITOR_CREATED)
 // private classes
 // ----------------------------------------------------------------------------
 
-class WXDLLIMPEXP_ADV wxGridRowLabelWindow : public wxWindow
+// common base class for various grid subwindows
+class WXDLLIMPEXP_ADV wxGridSubwindow : public wxWindow
 {
 public:
-    wxGridRowLabelWindow() { m_owner = (wxGrid *)NULL; }
+    wxGridSubwindow() { m_owner = NULL; }
+    wxGridSubwindow(wxGrid *owner,
+                    wxWindowID id,
+                    const wxPoint& pos,
+                    const wxSize& size,
+                    int additionalStyle = 0,
+                    const wxString& name = wxPanelNameStr)
+        : wxWindow(owner, id, pos, size,
+                   wxBORDER_NONE | additionalStyle,
+                   name)
+    {
+        m_owner = owner;
+    }
+
+    virtual bool AcceptsFocus() const { return false; }
+
+    wxGrid *GetOwner() { return m_owner; }
+
+protected:
+    void OnMouseCaptureLost(wxMouseCaptureLostEvent& event);
+
+    wxGrid *m_owner;
+
+    DECLARE_EVENT_TABLE()
+    DECLARE_NO_COPY_CLASS(wxGridSubwindow)
+};
+
+class WXDLLIMPEXP_ADV wxGridRowLabelWindow : public wxGridSubwindow
+{
+public:
+    wxGridRowLabelWindow() { }
     wxGridRowLabelWindow( wxGrid *parent, wxWindowID id,
                           const wxPoint &pos, const wxSize &size );
 
 private:
-    wxGrid   *m_owner;
-
     void OnPaint( wxPaintEvent& event );
     void OnMouseEvent( wxMouseEvent& event );
     void OnMouseWheel( wxMouseEvent& event );
-    void OnKeyDown( wxKeyEvent& event );
-    void OnKeyUp( wxKeyEvent& );
-    void OnChar( wxKeyEvent& );
 
     DECLARE_DYNAMIC_CLASS(wxGridRowLabelWindow)
     DECLARE_EVENT_TABLE()
@@ -143,22 +196,17 @@ private:
 };
 
 
-class WXDLLIMPEXP_ADV wxGridColLabelWindow : public wxWindow
+class WXDLLIMPEXP_ADV wxGridColLabelWindow : public wxGridSubwindow
 {
 public:
-    wxGridColLabelWindow() { m_owner = (wxGrid *)NULL; }
+    wxGridColLabelWindow() { }
     wxGridColLabelWindow( wxGrid *parent, wxWindowID id,
                           const wxPoint &pos, const wxSize &size );
 
 private:
-    wxGrid   *m_owner;
-
     void OnPaint( wxPaintEvent& event );
     void OnMouseEvent( wxMouseEvent& event );
     void OnMouseWheel( wxMouseEvent& event );
-    void OnKeyDown( wxKeyEvent& event );
-    void OnKeyUp( wxKeyEvent& );
-    void OnChar( wxKeyEvent& );
 
     DECLARE_DYNAMIC_CLASS(wxGridColLabelWindow)
     DECLARE_EVENT_TABLE()
@@ -166,21 +214,16 @@ private:
 };
 
 
-class WXDLLIMPEXP_ADV wxGridCornerLabelWindow : public wxWindow
+class WXDLLIMPEXP_ADV wxGridCornerLabelWindow : public wxGridSubwindow
 {
 public:
-    wxGridCornerLabelWindow() { m_owner = (wxGrid *)NULL; }
+    wxGridCornerLabelWindow() { }
     wxGridCornerLabelWindow( wxGrid *parent, wxWindowID id,
                              const wxPoint &pos, const wxSize &size );
 
 private:
-    wxGrid *m_owner;
-
     void OnMouseEvent( wxMouseEvent& event );
     void OnMouseWheel( wxMouseEvent& event );
-    void OnKeyDown( wxKeyEvent& event );
-    void OnKeyUp( wxKeyEvent& );
-    void OnChar( wxKeyEvent& );
     void OnPaint( wxPaintEvent& event );
 
     DECLARE_DYNAMIC_CLASS(wxGridCornerLabelWindow)
@@ -188,12 +231,11 @@ private:
     DECLARE_NO_COPY_CLASS(wxGridCornerLabelWindow)
 };
 
-class WXDLLIMPEXP_ADV wxGridWindow : public wxWindow
+class WXDLLIMPEXP_ADV wxGridWindow : public wxGridSubwindow
 {
 public:
     wxGridWindow()
     {
-        m_owner = NULL;
         m_rowLabelWin = NULL;
         m_colLabelWin = NULL;
     }
@@ -202,14 +244,12 @@ public:
                   wxGridRowLabelWindow *rowLblWin,
                   wxGridColLabelWindow *colLblWin,
                   wxWindowID id, const wxPoint &pos, const wxSize &size );
-    virtual ~wxGridWindow() {}
 
     void ScrollWindow( int dx, int dy, const wxRect *rect );
 
-    wxGrid* GetOwner() { return m_owner; }
+    virtual bool AcceptsFocus() const { return true; }
 
 private:
-    wxGrid                   *m_owner;
     wxGridRowLabelWindow     *m_rowLabelWin;
     wxGridColLabelWindow     *m_colLabelWin;
 
@@ -472,7 +512,7 @@ void wxGridCellEditor::PaintBackground(const wxRect& rectCell,
         gridWindow->GetOwner()->PrepareDC(dc);
 
     dc.SetPen(*wxTRANSPARENT_PEN);
-    dc.SetBrush(wxBrush(attr->GetBackgroundColour(), wxSOLID));
+    dc.SetBrush(wxBrush(attr->GetBackgroundColour(), wxBRUSHSTYLE_SOLID));
     dc.DrawRectangle(rectCell);
 
     // redraw the control we just painted over
@@ -624,21 +664,24 @@ void wxGridCellTextEditor::Create(wxWindow* parent,
                                   wxWindowID id,
                                   wxEvtHandler* evtHandler)
 {
+    DoCreate(parent, id, evtHandler);
+}
+
+void wxGridCellTextEditor::DoCreate(wxWindow* parent,
+                                    wxWindowID id,
+                                    wxEvtHandler* evtHandler,
+                                    long style)
+{
+    style |= wxTE_PROCESS_ENTER | wxTE_PROCESS_TAB | wxNO_BORDER;
+
     m_control = new wxTextCtrl(parent, id, wxEmptyString,
-                               wxDefaultPosition, wxDefaultSize
-#if defined(__WXMSW__)
-                               ,
-                               wxTE_PROCESS_ENTER |
-                               wxTE_PROCESS_TAB |
-                               wxTE_AUTO_SCROLL |
-                               wxNO_BORDER
-#endif
-                              );
+                               wxDefaultPosition, wxDefaultSize,
+                               style);
 
     // set max length allowed in the textctrl, if the parameter was set
-    if (m_maxChars != 0)
+    if ( m_maxChars != 0 )
     {
-        ((wxTextCtrl*)m_control)->SetMaxLength(m_maxChars);
+        Text()->SetMaxLength(m_maxChars);
     }
 
     wxGridCellEditor::Create(parent, id, evtHandler);
@@ -910,7 +953,6 @@ void wxGridCellNumberEditor::BeginEdit(int row, int col, wxGrid* grid)
 bool wxGridCellNumberEditor::EndEdit(int row, int col,
                                      wxGrid* grid)
 {
-    bool changed;
     long value = 0;
     wxString text;
 
@@ -918,26 +960,40 @@ bool wxGridCellNumberEditor::EndEdit(int row, int col,
     if ( HasRange() )
     {
         value = Spin()->GetValue();
-        changed = value != m_valueOld;
-        if (changed)
-            text = wxString::Format(wxT("%ld"), value);
+        if ( value == m_valueOld )
+            return false;
+
+        text.Printf(wxT("%ld"), value);
     }
-    else
-#endif
+    else // using unconstrained input
+#endif // wxUSE_SPINCTRL
     {
+        const wxString textOld(grid->GetCellValue(row, col));
         text = Text()->GetValue();
-        changed = (text.empty() || text.ToLong(&value)) && (value != m_valueOld);
-    }
+        if ( text.empty() )
+        {
+            if ( textOld.empty() )
+                return false;
+        }
+        else // non-empty text now (maybe 0)
+        {
+            if ( !text.ToLong(&value) )
+                return false;
 
-    if ( changed )
-    {
-        if (grid->GetTable()->CanSetValueAs(row, col, wxGRID_VALUE_NUMBER))
-            grid->GetTable()->SetValueAsLong(row, col, value);
-        else
-            grid->GetTable()->SetValue(row, col, text);
+            // if value == m_valueOld == 0 but old text was "" and new one is
+            // "0" something still did change
+            if ( value == m_valueOld && (value || !textOld.empty()) )
+                return false;
+        }
     }
 
-    return changed;
+    wxGridTableBase * const table = grid->GetTable();
+    if ( table->CanSetValueAs(row, col, wxGRID_VALUE_NUMBER) )
+        table->SetValueAsLong(row, col, value);
+    else
+        table->SetValue(row, col, text);
+
+    return true;
 }
 
 void wxGridCellNumberEditor::Reset()
@@ -1070,7 +1126,7 @@ void wxGridCellFloatEditor::Create(wxWindow* parent,
 void wxGridCellFloatEditor::BeginEdit(int row, int col, wxGrid* grid)
 {
     // first get the value
-    wxGridTableBase *table = grid->GetTable();
+    wxGridTableBase * const table = grid->GetTable();
     if ( table->CanGetValueAs(row, col, wxGRID_VALUE_FLOAT) )
     {
         m_valueOld = table->GetValueAsDouble(row, col);
@@ -1078,35 +1134,53 @@ void wxGridCellFloatEditor::BeginEdit(int row, int col, wxGrid* grid)
     else
     {
         m_valueOld = 0.0;
-        wxString sValue = table->GetValue(row, col);
-        if (! sValue.ToDouble(&m_valueOld) && ! sValue.empty())
+
+        const wxString value = table->GetValue(row, col);
+        if ( !value.empty() )
         {
-            wxFAIL_MSG( _T("this cell doesn't have float value") );
-            return;
+            if ( !value.ToDouble(&m_valueOld) )
+            {
+                wxFAIL_MSG( _T("this cell doesn't have float value") );
+                return;
+            }
         }
     }
 
     DoBeginEdit(GetString());
 }
 
-bool wxGridCellFloatEditor::EndEdit(int row, int col,
-                                     wxGrid* grid)
+bool wxGridCellFloatEditor::EndEdit(int row, int col, wxGrid* grid)
 {
-    double value = 0.0;
-    wxString text(Text()->GetValue());
+    const wxString text(Text()->GetValue()),
+                   textOld(grid->GetCellValue(row, col));
 
-    if ( (text.empty() || text.ToDouble(&value)) &&
-            !wxIsSameDouble(value, m_valueOld) )
+    double value;
+    if ( !text.empty() )
     {
-        if (grid->GetTable()->CanSetValueAs(row, col, wxGRID_VALUE_FLOAT))
-            grid->GetTable()->SetValueAsDouble(row, col, value);
-        else
-            grid->GetTable()->SetValue(row, col, text);
+        if ( !text.ToDouble(&value) )
+            return false;
+    }
+    else // new value is empty string
+    {
+        if ( textOld.empty() )
+            return false;           // nothing changed
 
-        return true;
+        value = 0.;
     }
 
-    return false;
+    // the test for empty strings ensures that we don't skip the value setting
+    // when "" is replaced by "0" or vice versa as "" numeric value is also 0.
+    if ( wxIsSameDouble(value, m_valueOld) && !text.empty() && !textOld.empty() )
+        return false;           // nothing changed
+
+    wxGridTableBase * const table = grid->GetTable();
+
+    if ( table->CanSetValueAs(row, col, wxGRID_VALUE_FLOAT) )
+        table->SetValueAsDouble(row, col, value);
+    else
+        table->SetValue(row, col, text);
+
+    return true;
 }
 
 void wxGridCellFloatEditor::Reset()
@@ -1496,10 +1570,16 @@ void wxGridCellChoiceEditor::Create(wxWindow* parent,
                                     wxWindowID id,
                                     wxEvtHandler* evtHandler)
 {
+    int style = wxTE_PROCESS_ENTER |
+                wxTE_PROCESS_TAB |
+                wxBORDER_NONE;
+
+    if ( !m_allowOthers )
+        style |= wxCB_READONLY;
     m_control = new wxComboBox(parent, id, wxEmptyString,
                                wxDefaultPosition, wxDefaultSize,
                                m_choices,
-                               m_allowOthers ? 0 : wxCB_READONLY);
+                               style);
 
     wxGridCellEditor::Create(parent, id, evtHandler);
 }
@@ -1531,20 +1611,8 @@ void wxGridCellChoiceEditor::BeginEdit(int row, int col, wxGrid* grid)
 
     m_startValue = grid->GetTable()->GetValue(row, col);
 
-    if (m_allowOthers)
-    {
-        Combo()->SetValue(m_startValue);
-    }
-    else
-    {
-        // find the right position, or default to the first if not found
-        int pos = Combo()->FindString(m_startValue);
-        if (pos == wxNOT_FOUND)
-            pos = 0;
-        Combo()->SetSelection(pos);
-    }
+    Reset(); // this updates combo box to correspond to m_startValue
 
-    Combo()->SetInsertionPointEnd();
     Combo()->SetFocus();
 
     if (evtHandler)
@@ -1571,8 +1639,19 @@ bool wxGridCellChoiceEditor::EndEdit(int row, int col,
 
 void wxGridCellChoiceEditor::Reset()
 {
-    Combo()->SetValue(m_startValue);
-    Combo()->SetInsertionPointEnd();
+    if (m_allowOthers)
+    {
+        Combo()->SetValue(m_startValue);
+        Combo()->SetInsertionPointEnd();
+    }
+    else // the combobox is read-only
+    {
+        // find the right position, or default to the first if not found
+        int pos = Combo()->FindString(m_startValue);
+        if (pos == wxNOT_FOUND)
+            pos = 0;
+        Combo()->SetSelection(pos);
+    }
 }
 
 void wxGridCellChoiceEditor::SetParameters(const wxString& params)
@@ -1778,23 +1857,28 @@ void wxGridCellRenderer::Draw(wxGrid& grid,
                               int WXUNUSED(row), int WXUNUSED(col),
                               bool isSelected)
 {
-    dc.SetBackgroundMode( wxSOLID );
+    dc.SetBackgroundMode( wxBRUSHSTYLE_SOLID );
 
     // grey out fields if the grid is disabled
     if ( grid.IsEnabled() )
     {
         if ( isSelected )
         {
-            dc.SetBrush( wxBrush(grid.GetSelectionBackground(), wxSOLID) );
+            wxColour clr;
+            if ( grid.HasFocus() )
+                clr = grid.GetSelectionBackground();
+            else
+                clr = wxSystemSettings::GetColour(wxSYS_COLOUR_BTNSHADOW);
+            dc.SetBrush( wxBrush(clr, wxBRUSHSTYLE_SOLID) );
         }
         else
         {
-            dc.SetBrush( wxBrush(attr.GetBackgroundColour(), wxSOLID) );
+            dc.SetBrush( wxBrush(attr.GetBackgroundColour(), wxBRUSHSTYLE_SOLID) );
         }
     }
     else
     {
-        dc.SetBrush(wxBrush(wxSystemSettings::GetColour(wxSYS_COLOUR_BTNFACE), wxSOLID));
+        dc.SetBrush(wxBrush(wxSystemSettings::GetColour(wxSYS_COLOUR_BTNFACE), wxBRUSHSTYLE_SOLID));
     }
 
     dc.SetPen( *wxTRANSPARENT_PEN );
@@ -1810,7 +1894,7 @@ void wxGridCellStringRenderer::SetTextColoursAndFont(const wxGrid& grid,
                                                      wxDC& dc,
                                                      bool isSelected)
 {
-    dc.SetBackgroundMode( wxTRANSPARENT );
+    dc.SetBackgroundMode( wxBRUSHSTYLE_TRANSPARENT );
 
     // TODO some special colours for attr.IsReadOnly() case?
 
@@ -1819,7 +1903,12 @@ void wxGridCellStringRenderer::SetTextColoursAndFont(const wxGrid& grid,
     {
         if ( isSelected )
         {
-            dc.SetTextBackground( grid.GetSelectionBackground() );
+            wxColour clr;
+            if ( grid.HasFocus() )
+                clr = grid.GetSelectionBackground();
+            else
+                clr = wxSystemSettings::GetColour(wxSYS_COLOUR_BTNSHADOW);
+            dc.SetTextBackground( clr );
             dc.SetTextForeground( grid.GetSelectionForeground() );
         }
         else
@@ -2180,8 +2269,7 @@ wxSize wxGridCellBoolRenderer::GetBestSize(wxGrid& grid,
         wxSize size = checkbox->GetBestSize();
         wxCoord checkSize = size.y + 2 * wxGRID_CHECKMARK_MARGIN;
 
-        // FIXME wxGTK::wxCheckBox::GetBestSize() gives "wrong" result
-#if defined(__WXGTK__) || defined(__WXMOTIF__)
+#if defined(__WXMOTIF__)
         checkSize -= size.y / 2;
 #endif
 
@@ -2210,7 +2298,7 @@ void wxGridCellBoolRenderer::Draw(wxGrid& grid,
     if ( size.x >= minSize || size.y >= minSize )
     {
         // and even leave (at least) 1 pixel margin
-        size.x = size.y = minSize - 2;
+        size.x = size.y = minSize;
     }
 
     // draw a border around checkmark
@@ -2251,26 +2339,11 @@ void wxGridCellBoolRenderer::Draw(wxGrid& grid,
         value = wxGridCellBoolEditor::IsTrueValue(cellval);
     }
 
-    if ( value )
-    {
-        wxRect rectMark = rectBorder;
-
-#ifdef __WXMSW__
-        // MSW DrawCheckMark() is weird (and should probably be changed...)
-        rectMark.Inflate(-wxGRID_CHECKMARK_MARGIN / 2);
-        rectMark.x++;
-        rectMark.y++;
-#else
-        rectMark.Inflate(-wxGRID_CHECKMARK_MARGIN);
-#endif
-
-        dc.SetTextForeground(attr.GetTextColour());
-        dc.DrawCheckMark(rectMark);
-    }
+    int flags = 0;
+    if (value)
+        flags |= wxCONTROL_CHECKED;
 
-    dc.SetBrush(*wxTRANSPARENT_BRUSH);
-    dc.SetPen(wxPen(attr.GetTextColour(), 1, wxSOLID));
-    dc.DrawRectangle(rectBorder);
+    wxRendererNative::Get().DrawCheckBox( &grid, dc, rectBorder, flags );
 }
 
 // ----------------------------------------------------------------------------
@@ -2568,21 +2641,25 @@ wxGridCellEditor* wxGridCellAttr::GetEditor(const wxGrid* grid, int row, int col
 
 void wxGridCellAttrData::SetAttr(wxGridCellAttr *attr, int row, int col)
 {
+    // Note: contrary to wxGridRowOrColAttrData::SetAttr, we must not
+    //       touch attribute's reference counting explicitly, since this
+    //       is managed by class wxGridCellWithAttr
     int n = FindIndex(row, col);
     if ( n == wxNOT_FOUND )
     {
-        // add the attribute
-        m_attrs.Add(new wxGridCellWithAttr(row, col, attr));
+        if ( attr )
+        {
+            // add the attribute
+            m_attrs.Add(new wxGridCellWithAttr(row, col, attr));
+        }
+        //else: nothing to do
     }
-    else
+    else // we already have an attribute for this cell
     {
-        // free the old attribute
-        m_attrs[(size_t)n].attr->DecRef();
-
         if ( attr )
         {
             // change the attribute
-            m_attrs[(size_t)n].attr = attr;
+            m_attrs[(size_t)n].ChangeAttr(attr);
         }
         else
         {
@@ -2631,8 +2708,6 @@ void wxGridCellAttrData::UpdateAttrRows( size_t pos, int numRows )
                 else
                 {
                     // ...or remove the attribute
-                    // No need to DecRef the attribute itself since this is
-                    // done be wxGridCellWithAttr's destructor!
                     m_attrs.RemoveAt(n);
                     n--;
                     count--;
@@ -2667,8 +2742,6 @@ void wxGridCellAttrData::UpdateAttrCols( size_t pos, int numCols )
                 else
                 {
                     // ...or remove the attribute
-                    // No need to DecRef the attribute itself since this is
-                    // done be wxGridCellWithAttr's destructor!
                     m_attrs.RemoveAt(n);
                     n--;
                     count--;
@@ -2699,7 +2772,7 @@ int wxGridCellAttrData::FindIndex(int row, int col) const
 
 wxGridRowOrColAttrData::~wxGridRowOrColAttrData()
 {
-    size_t count = m_attrs.Count();
+    size_t count = m_attrs.GetCount();
     for ( size_t n = 0; n < count; n++ )
     {
         m_attrs[n]->DecRef();
@@ -2725,22 +2798,31 @@ void wxGridRowOrColAttrData::SetAttr(wxGridCellAttr *attr, int rowOrCol)
     int i = m_rowsOrCols.Index(rowOrCol);
     if ( i == wxNOT_FOUND )
     {
-        // add the attribute
-        m_rowsOrCols.Add(rowOrCol);
-        m_attrs.Add(attr);
+        if ( attr )
+        {
+            // add the attribute - no need to do anything to reference count
+            //                     since we take ownership of the attribute.
+            m_rowsOrCols.Add(rowOrCol);
+            m_attrs.Add(attr);
+        }
+        // nothing to remove
     }
     else
     {
         size_t n = (size_t)i;
+        if ( m_attrs[n] == attr )
+            // nothing to do
+            return; 
         if ( attr )
         {
-            // change the attribute
+            // change the attribute, handling reference count manually,
+            //                       taking ownership of the new attribute.
             m_attrs[n]->DecRef();
             m_attrs[n] = attr;
         }
         else
         {
-            // remove this attribute
+            // remove this attribute, handling reference count manually
             m_attrs[n]->DecRef();
             m_rowsOrCols.RemoveAt(n);
             m_attrs.RemoveAt(n);
@@ -2940,7 +3022,7 @@ void wxGridCellAttrProvider::UpdateAttrCols( size_t pos, int numCols )
 
 wxGridTypeRegistry::~wxGridTypeRegistry()
 {
-    size_t count = m_typeinfo.Count();
+    size_t count = m_typeinfo.GetCount();
     for ( size_t i = 0; i < count; i++ )
         delete m_typeinfo[i];
 }
@@ -3141,7 +3223,8 @@ void wxGridTableBase::SetAttr(wxGridCellAttr* attr, int row, int col)
 {
     if ( m_attrProvider )
     {
-        attr->SetKind(wxGridCellAttr::Cell);
+        if ( attr )
+            attr->SetKind(wxGridCellAttr::Cell);
         m_attrProvider->SetAttr(attr, row, col);
     }
     else
@@ -3745,21 +3828,27 @@ void wxGridStringTable::SetColLabelValue( int col, const wxString& value )
 //////////////////////////////////////////////////////////////////////
 //////////////////////////////////////////////////////////////////////
 
+BEGIN_EVENT_TABLE(wxGridSubwindow, wxWindow)
+    EVT_MOUSE_CAPTURE_LOST(wxGridSubwindow::OnMouseCaptureLost)
+END_EVENT_TABLE()
+
+void wxGridSubwindow::OnMouseCaptureLost(wxMouseCaptureLostEvent& WXUNUSED(event))
+{
+    m_owner->CancelMouseCapture();
+}
+
 IMPLEMENT_DYNAMIC_CLASS( wxGridRowLabelWindow, wxWindow )
 
-BEGIN_EVENT_TABLE( wxGridRowLabelWindow, wxWindow )
+BEGIN_EVENT_TABLE( wxGridRowLabelWindow, wxGridSubwindow )
     EVT_PAINT( wxGridRowLabelWindow::OnPaint )
     EVT_MOUSEWHEEL( wxGridRowLabelWindow::OnMouseWheel )
     EVT_MOUSE_EVENTS( wxGridRowLabelWindow::OnMouseEvent )
-    EVT_KEY_DOWN( wxGridRowLabelWindow::OnKeyDown )
-    EVT_KEY_UP( wxGridRowLabelWindow::OnKeyUp )
-    EVT_CHAR( wxGridRowLabelWindow::OnChar )
 END_EVENT_TABLE()
 
 wxGridRowLabelWindow::wxGridRowLabelWindow( wxGrid *parent,
                                             wxWindowID id,
                                             const wxPoint &pos, const wxSize &size )
-  : wxWindow( parent, id, pos, size, wxWANTS_CHARS | wxBORDER_NONE | wxFULL_REPAINT_ON_RESIZE )
+  : wxGridSubwindow(parent, id, pos, size)
 {
     m_owner = parent;
 }
@@ -3793,44 +3882,20 @@ void wxGridRowLabelWindow::OnMouseWheel( wxMouseEvent& event )
     m_owner->GetEventHandler()->ProcessEvent( event );
 }
 
-// This seems to be required for wxMotif otherwise the mouse
-// cursor must be in the cell edit control to get key events
-//
-void wxGridRowLabelWindow::OnKeyDown( wxKeyEvent& event )
-{
-    if ( !m_owner->GetEventHandler()->ProcessEvent( event ) )
-        event.Skip();
-}
-
-void wxGridRowLabelWindow::OnKeyUp( wxKeyEvent& event )
-{
-    if ( !m_owner->GetEventHandler()->ProcessEvent( event ) )
-        event.Skip();
-}
-
-void wxGridRowLabelWindow::OnChar( wxKeyEvent& event )
-{
-    if ( !m_owner->GetEventHandler()->ProcessEvent( event ) )
-        event.Skip();
-}
-
 //////////////////////////////////////////////////////////////////////
 
 IMPLEMENT_DYNAMIC_CLASS( wxGridColLabelWindow, wxWindow )
 
-BEGIN_EVENT_TABLE( wxGridColLabelWindow, wxWindow )
+BEGIN_EVENT_TABLE( wxGridColLabelWindow, wxGridSubwindow )
     EVT_PAINT( wxGridColLabelWindow::OnPaint )
     EVT_MOUSEWHEEL( wxGridColLabelWindow::OnMouseWheel )
     EVT_MOUSE_EVENTS( wxGridColLabelWindow::OnMouseEvent )
-    EVT_KEY_DOWN( wxGridColLabelWindow::OnKeyDown )
-    EVT_KEY_UP( wxGridColLabelWindow::OnKeyUp )
-    EVT_CHAR( wxGridColLabelWindow::OnChar )
 END_EVENT_TABLE()
 
 wxGridColLabelWindow::wxGridColLabelWindow( wxGrid *parent,
                                             wxWindowID id,
                                             const wxPoint &pos, const wxSize &size )
-  : wxWindow( parent, id, pos, size, wxWANTS_CHARS | wxBORDER_NONE | wxFULL_REPAINT_ON_RESIZE )
+  : wxGridSubwindow(parent, id, pos, size)
 {
     m_owner = parent;
 }
@@ -3867,44 +3932,20 @@ void wxGridColLabelWindow::OnMouseWheel( wxMouseEvent& event )
     m_owner->GetEventHandler()->ProcessEvent( event );
 }
 
-// This seems to be required for wxMotif otherwise the mouse
-// cursor must be in the cell edit control to get key events
-//
-void wxGridColLabelWindow::OnKeyDown( wxKeyEvent& event )
-{
-    if ( !m_owner->GetEventHandler()->ProcessEvent( event ) )
-        event.Skip();
-}
-
-void wxGridColLabelWindow::OnKeyUp( wxKeyEvent& event )
-{
-    if ( !m_owner->GetEventHandler()->ProcessEvent( event ) )
-        event.Skip();
-}
-
-void wxGridColLabelWindow::OnChar( wxKeyEvent& event )
-{
-    if ( !m_owner->GetEventHandler()->ProcessEvent( event ) )
-        event.Skip();
-}
-
 //////////////////////////////////////////////////////////////////////
 
 IMPLEMENT_DYNAMIC_CLASS( wxGridCornerLabelWindow, wxWindow )
 
-BEGIN_EVENT_TABLE( wxGridCornerLabelWindow, wxWindow )
+BEGIN_EVENT_TABLE( wxGridCornerLabelWindow, wxGridSubwindow )
     EVT_MOUSEWHEEL( wxGridCornerLabelWindow::OnMouseWheel )
     EVT_MOUSE_EVENTS( wxGridCornerLabelWindow::OnMouseEvent )
     EVT_PAINT( wxGridCornerLabelWindow::OnPaint )
-    EVT_KEY_DOWN( wxGridCornerLabelWindow::OnKeyDown )
-    EVT_KEY_UP( wxGridCornerLabelWindow::OnKeyUp )
-    EVT_CHAR( wxGridCornerLabelWindow::OnChar )
 END_EVENT_TABLE()
 
 wxGridCornerLabelWindow::wxGridCornerLabelWindow( wxGrid *parent,
                                                   wxWindowID id,
                                                   const wxPoint &pos, const wxSize &size )
-  : wxWindow( parent, id, pos, size, wxWANTS_CHARS | wxBORDER_NONE | wxFULL_REPAINT_ON_RESIZE )
+  : wxGridSubwindow(parent, id, pos, size)
 {
     m_owner = parent;
 }
@@ -3928,7 +3969,7 @@ def __WXGTK__
 
     wxRendererNative::Get().DrawHeaderButton( this, dc, rect, 0 );
 #else // !__WXGTK__
-    dc.SetPen( wxPen(wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW), 1, wxSOLID) );
+    dc.SetPen( wxPen(wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW), 1, wxPENSTYLE_SOLID) );
     dc.DrawLine( client_width - 1, client_height - 1, client_width - 1, 0 );
     dc.DrawLine( client_width - 1, client_height - 1, 0, client_height - 1 );
     dc.DrawLine( 0, 0, client_width, 0 );
@@ -3950,32 +3991,11 @@ void wxGridCornerLabelWindow::OnMouseWheel( wxMouseEvent& event )
     m_owner->GetEventHandler()->ProcessEvent(event);
 }
 
-// This seems to be required for wxMotif otherwise the mouse
-// cursor must be in the cell edit control to get key events
-//
-void wxGridCornerLabelWindow::OnKeyDown( wxKeyEvent& event )
-{
-    if ( !m_owner->GetEventHandler()->ProcessEvent( event ) )
-        event.Skip();
-}
-
-void wxGridCornerLabelWindow::OnKeyUp( wxKeyEvent& event )
-{
-    if ( !m_owner->GetEventHandler()->ProcessEvent( event ) )
-        event.Skip();
-}
-
-void wxGridCornerLabelWindow::OnChar( wxKeyEvent& event )
-{
-    if ( !m_owner->GetEventHandler()->ProcessEvent( event ) )
-        event.Skip();
-}
-
 //////////////////////////////////////////////////////////////////////
 
 IMPLEMENT_DYNAMIC_CLASS( wxGridWindow, wxWindow )
 
-BEGIN_EVENT_TABLE( wxGridWindow, wxWindow )
+BEGIN_EVENT_TABLE( wxGridWindow, wxGridSubwindow )
     EVT_PAINT( wxGridWindow::OnPaint )
     EVT_MOUSEWHEEL( wxGridWindow::OnMouseWheel )
     EVT_MOUSE_EVENTS( wxGridWindow::OnMouseEvent )
@@ -3993,10 +4013,9 @@ wxGridWindow::wxGridWindow( wxGrid *parent,
                             wxWindowID id,
                             const wxPoint &pos,
                             const wxSize &size )
-            : wxWindow(
-                parent, id, pos, size,
-                wxWANTS_CHARS | wxBORDER_NONE | wxCLIP_CHILDREN | wxFULL_REPAINT_ON_RESIZE,
-                wxT("grid window") )
+            : wxGridSubwindow(parent, id, pos, size,
+                              wxWANTS_CHARS | wxCLIP_CHILDREN,
+                              wxT("grid window") )
 {
     m_owner = parent;
     m_rowLabelWin = rowLblWin;
@@ -4066,6 +4085,29 @@ void wxGridWindow::OnEraseBackground( wxEraseEvent& WXUNUSED(event) )
 
 void wxGridWindow::OnFocus(wxFocusEvent& event)
 {
+    // and if we have any selection, it has to be repainted, because it
+    // uses different colour when the grid is not focused:
+    if ( m_owner->IsSelection() )
+    {
+        Refresh();
+    }
+    else
+    {
+        // NB: Note that this code is in "else" branch only because the other
+        //     branch refreshes everything and so there's no point in calling
+        //     Refresh() again, *not* because it should only be done if
+        //     !IsSelection(). If the above code is ever optimized to refresh
+        //     only selected area, this needs to be moved out of the "else"
+        //     branch so that it's always executed.
+
+        // current cell cursor {dis,re}appears on focus change:
+        const wxGridCellCoords cursorCoords(m_owner->GetGridCursorRow(),
+                                            m_owner->GetGridCursorCol());
+        const wxRect cursor =
+            m_owner->BlockToDeviceRect(cursorCoords, cursorCoords);
+        Refresh(true, &cursor);
+    }
+
     if ( !m_owner->GetEventHandler()->ProcessEvent( event ) )
         event.Skip();
 }
@@ -4153,12 +4195,7 @@ END_EVENT_TABLE()
 
 wxGrid::wxGrid()
 {
-    // in order to make sure that a size event is not
-    // trigerred in a unfinished state
-    m_cornerLabelWin = NULL;
-    m_rowLabelWin = NULL;
-    m_colLabelWin = NULL;
-    m_gridWin = NULL;
+    InitVars();
 }
 
 wxGrid::wxGrid( wxWindow *parent,
@@ -4167,12 +4204,9 @@ wxGrid::wxGrid( wxWindow *parent,
                  const wxSize& size,
                  long style,
                  const wxString& name )
-  : wxScrolledWindow( parent, id, pos, size, (style | wxWANTS_CHARS), name ),
-    m_colMinWidths(GRID_HASH_SIZE),
-    m_rowMinHeights(GRID_HASH_SIZE)
 {
-    Create();
-    SetInitialSize(size);
+    InitVars();
+    Create(parent, id, pos, size, style, name);
 }
 
 bool wxGrid::Create(wxWindow *parent, wxWindowID id,
@@ -4188,6 +4222,7 @@ bool wxGrid::Create(wxWindow *parent, wxWindowID id,
 
     Create();
     SetInitialSize(size);
+    CalcDimensions();
 
     return true;
 }
@@ -4228,15 +4263,8 @@ wxGrid::~wxGrid()
 
 void wxGrid::Create()
 {
-    // set to true by CreateGrid
-    m_created = false;
-
     // create the type registry
     m_typeRegistry = new wxGridTypeRegistry;
-    m_selection = NULL;
-
-    m_table = (wxGridTableBase *) NULL;
-    m_ownTable = false;
 
     m_cellEditCtrlEnabled = false;
 
@@ -4368,7 +4396,7 @@ bool wxGrid::SetTable( wxGridTableBase *table, bool takeOwnership,
         // stop all processing
         m_created = false;
 
-        if (m_table) 
+        if (m_table)
         {
             m_table->SetView(0);
             if( m_ownTable )
@@ -4406,7 +4434,7 @@ bool wxGrid::SetTable( wxGridTableBase *table, bool takeOwnership,
             // original one current cell and selection regions
             // might be invalid,
             m_selectingKeyboard = wxGridNoCellCoords;
-            m_currentCellCoords = 
+            m_currentCellCoords =
               wxGridCellCoords(wxMin(m_numRows, m_currentCellCoords.GetRow()),
                                wxMin(m_numCols, m_currentCellCoords.GetCol()));
             if (m_selectingTopLeft.GetRow() >= m_numRows ||
@@ -4430,6 +4458,24 @@ bool wxGrid::SetTable( wxGridTableBase *table, bool takeOwnership,
     return m_created;
 }
 
+void wxGrid::InitVars()
+{
+    m_created = false;
+
+    m_cornerLabelWin = NULL;
+    m_rowLabelWin = NULL;
+    m_colLabelWin = NULL;
+    m_gridWin = NULL;
+
+    m_table = NULL;
+    m_ownTable = false;
+
+    m_selection = NULL;
+    m_defaultCellAttr = NULL;
+    m_typeRegistry = NULL;
+    m_winCapture = NULL;
+}
+
 void wxGrid::Init()
 {
     m_rowLabelWidth  = WXGRID_DEFAULT_ROW_LABEL_WIDTH;
@@ -4493,6 +4539,7 @@ void wxGrid::Init()
     m_dragRowOrCol = -1;
     m_isDragging = false;
     m_startDragPos = wxDefaultPosition;
+    m_nativeColumnLabels = false;
 
     m_waitForSlowClick = false;
 
@@ -4689,17 +4736,26 @@ void wxGrid::CalcWindowSizes()
         }
     }
 
+    // the grid may be too small to have enough space for the labels yet, don't
+    // size the windows to negative sizes in this case
+    int gw = cw - m_rowLabelWidth;
+    int gh = ch - m_colLabelHeight;
+    if (gw < 0)
+        gw = 0;
+    if (gh < 0)
+        gh = 0;
+
     if ( m_cornerLabelWin && m_cornerLabelWin->IsShown() )
         m_cornerLabelWin->SetSize( 0, 0, m_rowLabelWidth, m_colLabelHeight );
 
     if ( m_colLabelWin && m_colLabelWin->IsShown() )
-        m_colLabelWin->SetSize( m_rowLabelWidth, 0, cw - m_rowLabelWidth, m_colLabelHeight );
+        m_colLabelWin->SetSize( m_rowLabelWidth, 0, gw, m_colLabelHeight );
 
     if ( m_rowLabelWin && m_rowLabelWin->IsShown() )
-        m_rowLabelWin->SetSize( 0, m_colLabelHeight, m_rowLabelWidth, ch - m_colLabelHeight );
+        m_rowLabelWin->SetSize( 0, m_colLabelHeight, m_rowLabelWidth, gh );
 
     if ( m_gridWin && m_gridWin->IsShown() )
-        m_gridWin->SetSize( m_rowLabelWidth, m_colLabelHeight, cw - m_rowLabelWidth, ch - m_colLabelHeight );
+        m_gridWin->SetSize( m_rowLabelWidth, m_colLabelHeight, gw, gh );
 }
 
 // this is called when the grid table sends a message
@@ -5807,6 +5863,21 @@ void wxGrid::ProcessCornerLabelMouseEvent( wxMouseEvent& event )
     }
 }
 
+void wxGrid::CancelMouseCapture()
+{
+    // cancel operation currently in progress, whatever it is
+    if ( m_winCapture )
+    {
+        m_isDragging = false;
+        m_cursorMode = WXGRID_CURSOR_SELECT_CELL;
+        m_winCapture->SetCursor( *wxSTANDARD_CURSOR );
+        m_winCapture = NULL;
+
+        // remove traces of whatever we drew on screen
+        Refresh();
+    }
+}
+
 void wxGrid::ChangeCursorMode(CursorMode mode,
                               wxWindow *win,
                               bool captureMouse)
@@ -5974,9 +6045,10 @@ void wxGrid::ProcessGridCellMouseEvent( wxMouseEvent& event )
                 m_winCapture->CaptureMouse();
             }
 
-            
+
         }
-        else if ( m_cursorMode == WXGRID_CURSOR_RESIZE_ROW )
+        else if ( event.LeftIsDown() &&
+                  m_cursorMode == WXGRID_CURSOR_RESIZE_ROW )
         {
             int cw, ch, left, dummy;
             m_gridWin->GetClientSize( &cw, &ch );
@@ -5994,7 +6066,8 @@ void wxGrid::ProcessGridCellMouseEvent( wxMouseEvent& event )
             dc.DrawLine( left, y, left+cw, y );
             m_dragLastPos = y;
         }
-        else if ( m_cursorMode == WXGRID_CURSOR_RESIZE_COL )
+        else if ( event.LeftIsDown() &&
+                  m_cursorMode == WXGRID_CURSOR_RESIZE_COL )
         {
             int cw, ch, dummy, top;
             m_gridWin->GetClientSize( &cw, &ch );
@@ -6245,7 +6318,7 @@ void wxGrid::ProcessGridCellMouseEvent( wxMouseEvent& event )
             if ( m_cursorMode == WXGRID_CURSOR_SELECT_CELL )
             {
                 if ( CanDragRowSize() && CanDragGridSize() )
-                    ChangeCursorMode(WXGRID_CURSOR_RESIZE_ROW);
+                    ChangeCursorMode(WXGRID_CURSOR_RESIZE_ROW, NULL, false);
             }
         }
         else if ( dragCol >= 0 )
@@ -6255,7 +6328,7 @@ void wxGrid::ProcessGridCellMouseEvent( wxMouseEvent& event )
             if ( m_cursorMode == WXGRID_CURSOR_SELECT_CELL )
             {
                 if ( CanDragColSize() && CanDragGridSize() )
-                    ChangeCursorMode(WXGRID_CURSOR_RESIZE_COL);
+                    ChangeCursorMode(WXGRID_CURSOR_RESIZE_COL, NULL, false);
             }
         }
         else // Neither on a row or col edge
@@ -6737,7 +6810,7 @@ int wxGrid::SendEvent( const wxEventType type,
            pos.y += GetColLabelSize();
        if ( mouseEv.GetEventObject() == GetGridColLabelWindow() )
            pos.x += GetRowLabelSize();
-       
+
        wxGridEvent gridEvt( GetId(),
                type,
                this,
@@ -6818,7 +6891,7 @@ void wxGrid::Refresh(bool eraseb, const wxRect* rect)
 {
     // Don't do anything if between Begin/EndBatch...
     // EndBatch() will do all this on the last nested one anyway.
-    if (! GetBatchCount())
+    if ( m_created && !GetBatchCount() )
     {
         // Refresh to get correct scrolled position:
         wxScrolledWindow::Refresh(eraseb, rect);
@@ -6903,14 +6976,13 @@ void wxGrid::Refresh(bool eraseb, const wxRect* rect)
     }
 }
 
-void wxGrid::OnSize( wxSizeEvent& event )
+void wxGrid::OnSize(wxSizeEvent& WXUNUSED(event))
 {
-    // position the child windows
-    CalcWindowSizes();
-
-    // don't call CalcDimensions() from here, the base class handles the size
-    // changes itself
-    event.Skip();
+    if (m_targetWindow != this) // check whether initialisation has been done
+    {
+        // update our children window positions and scrollbars
+        CalcDimensions();
+    }
 }
 
 void wxGrid::OnKeyDown( wxKeyEvent& event )
@@ -6938,7 +7010,7 @@ void wxGrid::OnKeyDown( wxKeyEvent& event )
             else if (event.GetKeyCode() == WXK_LEFT)
                 event.m_keyCode = WXK_RIGHT;
         }
-    
+
         // try local handlers
         switch ( event.GetKeyCode() )
         {
@@ -7166,7 +7238,7 @@ void wxGrid::SetCurrentCell( const wxGridCellCoords& coords )
         return;
     }
 
-#if !(defined(__WXMAC__) && wxMAC_USE_CORE_GRAPHICS)
+#if !defined(__WXMAC__)
     wxClientDC dc( m_gridWin );
     PrepareDC( dc );
 #endif
@@ -7192,7 +7264,7 @@ void wxGrid::SetCurrentCell( const wxGridCellCoords& coords )
             // Otherwise refresh redraws the highlight!
             m_currentCellCoords = coords;
 
-#if defined(__WXMAC__) && wxMAC_USE_CORE_GRAPHICS
+#if defined(__WXMAC__)
             m_gridWin->Refresh(true /*, & r */);
 #else
             DrawGridCellArea( dc, cells );
@@ -7204,7 +7276,7 @@ void wxGrid::SetCurrentCell( const wxGridCellCoords& coords )
     m_currentCellCoords = coords;
 
     wxGridCellAttr *attr = GetCellAttr( coords );
-#if !(defined(__WXMAC__) && wxMAC_USE_CORE_GRAPHICS)
+#if !defined(__WXMAC__)
     DrawCellHighlight( dc, attr );
 #endif
     attr->DecRef();
@@ -7539,7 +7611,7 @@ void wxGrid::DrawGridSpace( wxDC& dc )
       int left, top;
       CalcUnscrolledPosition( 0, 0, &left, &top );
 
-      dc.SetBrush( wxBrush(GetDefaultCellBackgroundColour(), wxSOLID) );
+      dc.SetBrush( wxBrush(GetDefaultCellBackgroundColour(), wxBRUSHSTYLE_SOLID) );
       dc.SetPen( *wxTRANSPARENT_PEN );
 
       if ( right > rightCol )
@@ -7601,6 +7673,10 @@ void wxGrid::DrawCell( wxDC& dc, const wxGridCellCoords& coords )
 
 void wxGrid::DrawCellHighlight( wxDC& dc, const wxGridCellAttr *attr )
 {
+    // don't show highlight when the grid doesn't have focus
+    if ( !HasFocus() )
+        return;
+
     int row = m_currentCellCoords.GetRow();
     int col = m_currentCellCoords.GetCol();
 
@@ -7630,7 +7706,7 @@ void wxGrid::DrawCellHighlight( wxDC& dc, const wxGridCellAttr *attr )
         // Now draw the rectangle
         // use the cellHighlightColour if the cell is inside a selection, this
         // will ensure the cell is always visible.
-        dc.SetPen(wxPen(IsInSelection(row,col) ? m_selectionForeground : m_cellHighlightColour, penWidth, wxSOLID));
+        dc.SetPen(wxPen(IsInSelection(row,col) ? m_selectionForeground : m_cellHighlightColour, penWidth, wxPENSTYLE_SOLID));
         dc.SetBrush(*wxTRANSPARENT_BRUSH);
         dc.DrawRectangle(rect);
     }
@@ -7659,7 +7735,7 @@ void wxGrid::DrawCellHighlight( wxDC& dc, const wxGridCellAttr *attr )
 
 wxPen wxGrid::GetDefaultGridLinePen()
 {
-    return wxPen(GetGridLineColour(), 1, wxSOLID);
+    return wxPen(GetGridLineColour(), 1, wxPENSTYLE_SOLID);
 }
 
 wxPen wxGrid::GetRowGridLinePen(int WXUNUSED(row))
@@ -7777,7 +7853,6 @@ void wxGrid::DrawAllGridLines( wxDC& dc, const wxRegion & WXUNUSED(reg) )
     int rightCol = GetColPos( internalXToCol(right) );
     int bottomRow = internalYToRow(bottom);
 
-#if !defined(__WXMAC__) || wxMAC_USE_CORE_GRAPHICS
     wxRegion clippedcells(0, 0, cw, ch);
 
     int i, j, cell_rows, cell_cols;
@@ -7805,32 +7880,8 @@ void wxGrid::DrawAllGridLines( wxDC& dc, const wxRegion & WXUNUSED(reg) )
             }
         }
     }
-#else
-    wxRegion clippedcells( left, top, right - left, bottom - top );
-
-    int i, j, cell_rows, cell_cols;
-    wxRect rect;
-
-    for (j=topRow; j<=bottomRow; j++)
-    {
-        for (i=leftCol; i<=rightCol; i++)
-        {
-            GetCellSize( j, i, &cell_rows, &cell_cols );
-            if ((cell_rows > 1) || (cell_cols > 1))
-            {
-                rect = CellToRect(j, i);
-                clippedcells.Subtract(rect);
-            }
-            else if ((cell_rows < 0) || (cell_cols < 0))
-            {
-                rect = CellToRect(j + cell_rows, i + cell_cols);
-                clippedcells.Subtract(rect);
-            }
-        }
-    }
-#endif
 
-    dc.SetClippingRegion( clippedcells );
+    dc.SetDeviceClippingRegion( clippedcells );
 
 
     // horizontal grid lines
@@ -7901,23 +7952,10 @@ void wxGrid::DrawRowLabel( wxDC& dc, int row )
 
     wxRect rect;
 
-#if 0
-def __WXGTK20__
-    rect.SetX( 1 );
-    rect.SetY( GetRowTop(row) + 1 );
-    rect.SetWidth( m_rowLabelWidth - 2 );
-    rect.SetHeight( GetRowHeight(row) - 2 );
-
-    CalcScrolledPosition( 0, rect.y, NULL, &rect.y );
-
-    wxWindowDC *win_dc = (wxWindowDC*) &dc;
-
-    wxRendererNative::Get().DrawHeaderButton( win_dc->m_owner, dc, rect, 0 );
-#else
     int rowTop = GetRowTop(row),
         rowBottom = GetRowBottom(row) - 1;
 
-    dc.SetPen( wxPen(wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW), 1, wxSOLID) );
+    dc.SetPen( wxPen(wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW), 1, wxPENSTYLE_SOLID) );
     dc.DrawLine( m_rowLabelWidth - 1, rowTop, m_rowLabelWidth - 1, rowBottom );
     dc.DrawLine( 0, rowTop, 0, rowBottom );
     dc.DrawLine( 0, rowBottom, m_rowLabelWidth, rowBottom );
@@ -7925,9 +7963,8 @@ def __WXGTK20__
     dc.SetPen( *wxWHITE_PEN );
     dc.DrawLine( 1, rowTop, 1, rowBottom );
     dc.DrawLine( 1, rowTop, m_rowLabelWidth - 1, rowTop );
-#endif
 
-    dc.SetBackgroundMode( wxTRANSPARENT );
+    dc.SetBackgroundMode( wxBRUSHSTYLE_TRANSPARENT );
     dc.SetTextForeground( GetLabelTextColour() );
     dc.SetFont( GetLabelFont() );
 
@@ -7941,6 +7978,18 @@ def __WXGTK20__
     DrawTextRectangle( dc, GetRowLabelValue( row ), rect, hAlign, vAlign );
 }
 
+void wxGrid::SetUseNativeColLabels( bool native )
+{
+    m_nativeColumnLabels = native;
+    if (native)
+    {
+        int height = wxRendererNative::Get().GetHeaderButtonHeight( this );
+        SetColLabelSize( height );
+    }
+
+    m_colLabelWin->Refresh();
+}
+
 void wxGrid::DrawColLabels( wxDC& dc,const wxArrayInt& cols )
 {
     if ( !m_numCols )
@@ -7964,31 +8013,32 @@ void wxGrid::DrawColLabel( wxDC& dc, int col )
 
     wxRect rect;
 
-#if 0
-def __WXGTK20__
-    rect.SetX( colLeft + 1 );
-    rect.SetY( 1 );
-    rect.SetWidth( GetColWidth(col) - 2 );
-    rect.SetHeight( m_colLabelHeight - 2 );
-
-    wxWindowDC *win_dc = (wxWindowDC*) &dc;
+    if (m_nativeColumnLabels)
+    {
+        rect.SetX( colLeft);
+        rect.SetY( 0 );
+        rect.SetWidth( GetColWidth(col));
+        rect.SetHeight( m_colLabelHeight );
 
-    wxRendererNative::Get().DrawHeaderButton( win_dc->m_owner, dc, rect, 0 );
-#else
-    int colRight = GetColRight(col) - 1;
+        wxWindowDC *win_dc = (wxWindowDC*) &dc;
+        wxRendererNative::Get().DrawHeaderButton( win_dc->GetWindow(), dc, rect, 0 );
+    }
+    else
+    {
+        int colRight = GetColRight(col) - 1;
 
-    dc.SetPen( wxPen(wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW), 1, wxSOLID) );
-    dc.DrawLine( colRight, 0, colRight, m_colLabelHeight - 1 );
-    dc.DrawLine( colLeft, 0, colRight, 0 );
-    dc.DrawLine( colLeft, m_colLabelHeight - 1,
+        dc.SetPen( wxPen(wxSystemSettings::GetColour(wxSYS_COLOUR_3DSHADOW), 1, wxPENSTYLE_SOLID) );
+        dc.DrawLine( colRight, 0, colRight, m_colLabelHeight - 1 );
+        dc.DrawLine( colLeft, 0, colRight, 0 );
+        dc.DrawLine( colLeft, m_colLabelHeight - 1,
                  colRight + 1, m_colLabelHeight - 1 );
 
-    dc.SetPen( *wxWHITE_PEN );
-    dc.DrawLine( colLeft, 1, colLeft, m_colLabelHeight - 1 );
-    dc.DrawLine( colLeft, 1, colRight, 1 );
-#endif
+        dc.SetPen( *wxWHITE_PEN );
+        dc.DrawLine( colLeft, 1, colLeft, m_colLabelHeight - 1 );
+        dc.DrawLine( colLeft, 1, colRight, 1 );
+    }
 
-    dc.SetBackgroundMode( wxTRANSPARENT );
+    dc.SetBackgroundMode( wxBRUSHSTYLE_TRANSPARENT );
     dc.SetTextForeground( GetLabelTextColour() );
     dc.SetFont( GetLabelFont() );
 
@@ -8084,7 +8134,7 @@ void wxGrid::DrawTextRectangle(wxDC& dc,
             continue;
         }
 
-        long lineWidth = 0,
+        wxCoord lineWidth = 0,
              lineHeight = 0;
         dc.GetTextExtent(line, &lineWidth, &lineHeight);
 
@@ -8129,6 +8179,7 @@ void wxGrid::DrawTextRectangle(wxDC& dc,
 // Split multi-line text up into an array of strings.
 // Any existing contents of the string array are preserved.
 //
+// TODO: refactor wxTextFile::Read() and reuse the same code from here
 void wxGrid::StringToLines( const wxString& value, wxArrayString& lines ) const
 {
     int startPos = 0;
@@ -8149,15 +8200,15 @@ void wxGrid::StringToLines( const wxString& value, wxArrayString& lines ) const
         }
         else
         {
-            lines.Add( value.Mid(startPos, pos) );
+            lines.Add( tVal.Mid(startPos, pos) );
         }
 
         startPos += pos + 1;
     }
 
-    if ( startPos < (int)value.length() )
+    if ( startPos < (int)tVal.length() )
     {
-        lines.Add( value.Mid( startPos ) );
+        lines.Add( tVal.Mid( startPos ) );
     }
 }
 
@@ -8165,9 +8216,9 @@ void wxGrid::GetTextBoxSize( const wxDC& dc,
                              const wxArrayString& lines,
                              long *width, long *height ) const
 {
-    long w = 0;
-    long h = 0;
-    long lineW = 0, lineH = 0;
+    wxCoord w = 0;
+    wxCoord h = 0;
+    wxCoord lineW = 0, lineH = 0;
 
     size_t i;
     for ( i = 0; i < lines.GetCount(); i++ )
@@ -8351,7 +8402,7 @@ void wxGrid::ShowCellEditControl()
             wxClientDC dc( m_gridWin );
             PrepareDC( dc );
             wxGridCellAttr* attr = GetCellAttr(row, col);
-            dc.SetBrush(wxBrush(attr->GetBackgroundColour(), wxSOLID));
+            dc.SetBrush(wxBrush(attr->GetBackgroundColour(), wxBRUSHSTYLE_SOLID));
             dc.SetPen(*wxTRANSPARENT_PEN);
             dc.DrawRectangle(rect);
 
@@ -9373,7 +9424,13 @@ wxString wxGrid::GetColLabelValue( int col ) const
 
 void wxGrid::SetRowLabelSize( int width )
 {
-    width = wxMax( width, 0 );
+    wxASSERT( width >= 0 || width == wxGRID_AUTOSIZE );
+
+    if ( width == wxGRID_AUTOSIZE )
+    {
+        width = CalcColOrRowLabelAreaMinSize(wxGRID_ROW);
+    }
+
     if ( width != m_rowLabelWidth )
     {
         if ( width == 0 )
@@ -9396,7 +9453,13 @@ void wxGrid::SetRowLabelSize( int width )
 
 void wxGrid::SetColLabelSize( int height )
 {
-    height = wxMax( height, 0 );
+    wxASSERT( height >=0 || height == wxGRID_AUTOSIZE );
+
+    if ( height == wxGRID_AUTOSIZE )
+    {
+        height = CalcColOrRowLabelAreaMinSize(wxGRID_COLUMN);
+    }
+
     if ( height != m_colLabelHeight )
     {
         if ( height == 0 )
@@ -9614,7 +9677,7 @@ void wxGrid::SetCellHighlightPenWidth(int width)
         // make any visible change if the the thickness is getting smaller.
         int row = m_currentCellCoords.GetRow();
         int col = m_currentCellCoords.GetCol();
-        if ( GetColWidth(col) <= 0 || GetRowHeight(row) <= 0 )
+        if ( row == -1 || col == -1 || GetColWidth(col) <= 0 || GetRowHeight(row) <= 0 )
             return;
 
         wxRect rect = CellToRect(row, col);
@@ -9632,7 +9695,8 @@ void wxGrid::SetCellHighlightROPenWidth(int width)
         // make any visible change if the the thickness is getting smaller.
         int row = m_currentCellCoords.GetRow();
         int col = m_currentCellCoords.GetCol();
-        if ( GetColWidth(col) <= 0 || GetRowHeight(row) <= 0 )
+        if ( row == -1 || col == -1 ||
+                GetColWidth(col) <= 0 || GetRowHeight(row) <= 0 )
             return;
 
         wxRect rect = CellToRect(row, col);
@@ -9880,9 +9944,14 @@ void wxGrid::ClearAttrCache()
 {
     if ( m_attrCache.row != -1 )
     {
-        wxSafeDecRef(m_attrCache.attr);
+        wxGridCellAttr *oldAttr = m_attrCache.attr; 
         m_attrCache.attr = NULL;
         m_attrCache.row = -1;
+        // wxSafeDecRec(...) might cause event processing that accesses
+        // the cached attribute, if one exists (e.g. by deleting the
+        // editor stored within the attribute). Therefore it is important
+       // to invalidate the cache  before calling wxSafeDecRef!
+        wxSafeDecRef(oldAttr);
     }
 }
 
@@ -10004,6 +10073,8 @@ void wxGrid::SetColFormatCustom(int col, const wxString& typeName)
         attr = new wxGridCellAttr;
     wxGridCellRenderer *renderer = GetDefaultRendererForType(typeName);
     attr->SetRenderer(renderer);
+    wxGridCellEditor *editor = GetDefaultEditorForType(typeName); 
+    attr->SetEditor(editor); 
 
     SetColAttr(col, attr);
 
@@ -10123,7 +10194,7 @@ void wxGrid::SetCellSize( int row, int col, int num_rows, int num_cols )
                       wxT("wxGrid::SetCellSize setting cell size to < 1"));
 
         // if this was already a multicell then "turn off" the other cells first
-        if ((cell_rows > 1) || (cell_rows > 1))
+        if ((cell_rows > 1) || (cell_cols > 1))
         {
             int i, j;
             for (j=row; j < row + cell_rows; j++)
@@ -10220,10 +10291,7 @@ wxGridCellEditor * wxGrid::GetDefaultEditorForType(const wxString& typeName) con
     int index = m_typeRegistry->FindOrCloneDataType(typeName);
     if ( index == wxNOT_FOUND )
     {
-        wxString errStr;
-
-        errStr.Printf(wxT("Unknown data type name [%s]"), typeName.c_str());
-        wxFAIL_MSG(errStr.c_str());
+        wxFAIL_MSG(wxString::Format(wxT("Unknown data type name [%s]"), typeName.c_str()));
 
         return NULL;
     }
@@ -10236,10 +10304,7 @@ wxGridCellRenderer * wxGrid::GetDefaultRendererForType(const wxString& typeName)
     int index = m_typeRegistry->FindOrCloneDataType(typeName);
     if ( index == wxNOT_FOUND )
     {
-        wxString errStr;
-
-        errStr.Printf(wxT("Unknown data type name [%s]"), typeName.c_str());
-        wxFAIL_MSG(errStr.c_str());
+        wxFAIL_MSG(wxString::Format(wxT("Unknown data type name [%s]"), typeName.c_str()));
 
         return NULL;
     }
@@ -10292,6 +10357,19 @@ void wxGrid::SetRowSize( int row, int height )
 {
     wxCHECK_RET( row >= 0 && row < m_numRows, _T("invalid row index") );
 
+    // if < 0 then calculate new height from label
+    if ( height < 0 )
+    {
+        long w, h;
+        wxArrayString lines;
+        wxClientDC dc(m_rowLabelWin);
+        dc.SetFont(GetLabelFont());
+        StringToLines(GetRowLabelValue( row ), lines);
+       GetTextBoxSize( dc, lines, &w, &h );
+       //check that it is not less than the minimal height
+       height = wxMax(h, GetRowMinimalAcceptableHeight());
+    }
+
     // See comment in SetColSize
     if ( height < GetRowMinimalAcceptableHeight())
         return;
@@ -10337,6 +10415,23 @@ void wxGrid::SetColSize( int col, int width )
 {
     wxCHECK_RET( col >= 0 && col < m_numCols, _T("invalid column index") );
 
+    // if < 0 then calculate new width from label
+    if ( width < 0 )
+    {
+        long w, h;
+        wxArrayString lines;
+        wxClientDC dc(m_colLabelWin);
+        dc.SetFont(GetLabelFont());
+        StringToLines(GetColLabelValue(col), lines);
+        if ( GetColLabelTextOrientation() == wxHORIZONTAL )
+            GetTextBoxSize( dc, lines, &w, &h );
+        else
+            GetTextBoxSize( dc, lines, &h, &w );
+        width = w + 6;
+       //check that it is not less than the minimal width
+       width = wxMax(width, GetColMinimalAcceptableWidth()); 
+    }
+
     // should we check that it's bigger than GetColMinimalWidth(col) here?
     //                                                                 (VZ)
     // No, because it is reasonable to assume the library user know's
@@ -10354,18 +10449,6 @@ void wxGrid::SetColSize( int col, int width )
         InitColWidths();
     }
 
-    // if < 0 then calculate new width from label
-    if ( width < 0 )
-    {
-        long w, h;
-        wxArrayString lines;
-        wxClientDC dc(m_colLabelWin);
-        dc.SetFont(GetLabelFont());
-        StringToLines(GetColLabelValue(col), lines);
-        GetTextBoxSize(dc, lines, &w, &h);
-        width = w + 6;
-    }
-
     int w = wxMax( 0, width );
     int diff = w - m_colWidths[col];
     m_colWidths[col] = w;
@@ -10443,8 +10526,11 @@ int  wxGrid::GetRowMinimalAcceptableHeight() const
 // auto sizing
 // ----------------------------------------------------------------------------
 
-void wxGrid::AutoSizeColOrRow( int colOrRow, bool setAsMin, bool column )
+void
+wxGrid::AutoSizeColOrRow(int colOrRow, bool setAsMin, wxGridDirection direction)
 {
+    const bool column = direction == wxGRID_COLUMN;
+
     wxClientDC dc(m_gridWin);
 
     // cancel editing of cell
@@ -10517,6 +10603,12 @@ void wxGrid::AutoSizeColOrRow( int colOrRow, bool setAsMin, bool column )
 
     if ( column )
     {
+        // Ensure automatic width is not less than minimal width. See the
+        // comment in SetColSize() for explanation of why this isn't done
+        // in SetColSize().
+        if ( !setAsMin )
+            extentMax = wxMax(extentMax, GetColMinimalWidth(col));
+
         SetColSize( col, extentMax );
         if ( !GetBatchCount() )
         {
@@ -10532,6 +10624,12 @@ void wxGrid::AutoSizeColOrRow( int colOrRow, bool setAsMin, bool column )
     }
     else
     {
+        // Ensure automatic width is not less than minimal height. See the
+        // comment in SetColSize() for explanation of why this isn't done
+        // in SetRowSize().
+        if ( !setAsMin )
+            extentMax = wxMax(extentMax, GetRowMinimalHeight(row));
+
         SetRowSize(row, extentMax);
         if ( !GetBatchCount() )
         {
@@ -10555,12 +10653,66 @@ void wxGrid::AutoSizeColOrRow( int colOrRow, bool setAsMin, bool column )
     }
 }
 
+wxCoord wxGrid::CalcColOrRowLabelAreaMinSize(wxGridDirection direction)
+{
+    // calculate size for the rows or columns?
+    const bool calcRows = direction == wxGRID_ROW;
+
+    wxClientDC dc(calcRows ? GetGridRowLabelWindow()
+                           : GetGridColLabelWindow());
+    dc.SetFont(GetLabelFont());
+
+    // which dimension should we take into account for calculations?
+    //
+    // for columns, the text can be only horizontal so it's easy but for rows
+    // we also have to take into account the text orientation
+    const bool
+        useWidth = calcRows || (GetColLabelTextOrientation() == wxVERTICAL);
+
+    wxArrayString lines;
+    wxCoord extentMax = 0;
+
+    const int numRowsOrCols = calcRows ? m_numRows : m_numCols;
+    for ( int rowOrCol = 0; rowOrCol < numRowsOrCols; rowOrCol++ )
+    {
+        lines.Clear();
+
+        wxString label = calcRows ? GetRowLabelValue(rowOrCol)
+                                  : GetColLabelValue(rowOrCol);
+        StringToLines(label, lines);
+
+        long w, h;
+        GetTextBoxSize(dc, lines, &w, &h);
+
+        const wxCoord extent = useWidth ? w : h;
+        if ( extent > extentMax )
+            extentMax = extent;
+    }
+
+    if ( !extentMax )
+    {
+        // empty column - give default extent (notice that if extentMax is less
+        // than default extent but != 0, it's OK)
+        extentMax = calcRows ? GetDefaultRowLabelSize()
+                             : GetDefaultColLabelSize();
+    }
+
+    // leave some space around text (taken from AutoSizeColOrRow)
+    if ( calcRows )
+        extentMax += 10;
+    else
+        extentMax += 6;
+
+    return extentMax;
+}
+
 int wxGrid::SetOrCalcColumnSizes(bool calcOnly, bool setAsMin)
 {
     int width = m_rowLabelWidth;
 
-    if ( !calcOnly )
-        BeginBatch();
+    wxGridUpdateLocker locker;
+    if(!calcOnly)
+        locker.Create(this);
 
     for ( int col = 0; col < m_numCols; col++ )
     {
@@ -10570,9 +10722,6 @@ int wxGrid::SetOrCalcColumnSizes(bool calcOnly, bool setAsMin)
         width += GetColWidth(col);
     }
 
-    if ( !calcOnly )
-        EndBatch();
-
     return width;
 }
 
@@ -10580,8 +10729,9 @@ int wxGrid::SetOrCalcRowSizes(bool calcOnly, bool setAsMin)
 {
     int height = m_colLabelHeight;
 
-    if ( !calcOnly )
-        BeginBatch();
+    wxGridUpdateLocker locker;
+    if(!calcOnly)
+        locker.Create(this);
 
     for ( int row = 0; row < m_numRows; row++ )
     {
@@ -10591,15 +10741,12 @@ int wxGrid::SetOrCalcRowSizes(bool calcOnly, bool setAsMin)
         height += GetRowHeight(row);
     }
 
-    if ( !calcOnly )
-        EndBatch();
-
     return height;
 }
 
 void wxGrid::AutoSize()
 {
-    BeginBatch();
+    wxGridUpdateLocker locker(this);
 
     // we need to round up the size of the scrollable area to a multiple of
     // scroll step to ensure that we don't get the scrollbars when we're sized
@@ -10665,15 +10812,10 @@ void wxGrid::AutoSize()
     // client size but also leave space for (not needed any more) scrollbars
     SetScrollbars(0, 0, 0, 0, 0, 0, true);
     SetClientSize(sizeFit.x + m_rowLabelWidth, sizeFit.y + m_colLabelHeight);
-
-    EndBatch();
 }
 
 void wxGrid::AutoSizeRowLabelSize( int row )
 {
-    wxArrayString lines;
-    long w, h;
-
     // Hide the edit control, so it
     // won't interfere with drag-shrinking.
     if ( IsCellEditControlShown() )
@@ -10683,20 +10825,12 @@ void wxGrid::AutoSizeRowLabelSize( int row )
     }
 
     // autosize row height depending on label text
-    StringToLines( GetRowLabelValue( row ), lines );
-    wxClientDC dc( m_rowLabelWin );
-    GetTextBoxSize( dc, lines, &w, &h );
-    if ( h < m_defaultRowHeight )
-        h = m_defaultRowHeight;
-    SetRowSize(row, h);
+    SetRowSize(row, -1);
     ForceRefresh();
 }
 
 void wxGrid::AutoSizeColLabelSize( int col )
 {
-    wxArrayString lines;
-    long w, h;
-
     // Hide the edit control, so it
     // won't interfere with drag-shrinking.
     if ( IsCellEditControlShown() )
@@ -10706,15 +10840,7 @@ void wxGrid::AutoSizeColLabelSize( int col )
     }
 
     // autosize column width depending on label text
-    StringToLines( GetColLabelValue( col ), lines );
-    wxClientDC dc( m_colLabelWin );
-    if ( GetColLabelTextOrientation() == wxHORIZONTAL )
-        GetTextBoxSize( dc, lines, &w, &h );
-    else
-        GetTextBoxSize( dc, lines, &h, &w );
-    if ( w < m_defaultColWidth )
-        w = m_defaultColWidth;
-    SetColSize(col, w);
+    SetColSize(col, -1);
     ForceRefresh();
 }
 
@@ -10947,9 +11073,13 @@ wxArrayInt wxGrid::GetSelectedCols() const
 
 void wxGrid::ClearSelection()
 {
+    wxRect r1 = BlockToDeviceRect( m_selectingTopLeft, m_selectingBottomRight);
+    wxRect r2 = BlockToDeviceRect( m_currentCellCoords, m_selectingKeyboard );
     m_selectingTopLeft =
     m_selectingBottomRight =
     m_selectingKeyboard = wxGridNoCellCoords;
+    Refresh( false, &r1 );
+    Refresh( false, &r2 );
     if ( m_selection )
         m_selection->ClearSelection();
 }
@@ -10957,37 +11087,36 @@ void wxGrid::ClearSelection()
 // This function returns the rectangle that encloses the given block
 // in device coords clipped to the client size of the grid window.
 //
-wxRect wxGrid::BlockToDeviceRect( const wxGridCellCoords &topLeft,
-                                  const wxGridCellCoords &bottomRight ) const
+wxRect wxGrid::BlockToDeviceRect( const wxGridCellCoordstopLeft,
+                                  const wxGridCellCoordsbottomRight ) const
 {
-    wxRect rect( wxGridNoCellRect );
-    wxRect cellRect;
-
-    cellRect = CellToRect( topLeft );
-    if ( cellRect != wxGridNoCellRect )
+    wxRect resultRect;
+    wxRect tempCellRect = CellToRect(topLeft);
+    if ( tempCellRect != wxGridNoCellRect )
     {
-        rect = cellRect;
+        resultRect = tempCellRect;
     }
     else
     {
-        rect = wxRect(0, 0, 0, 0);
+        resultRect = wxRect(0, 0, 0, 0);
     }
 
-    cellRect = CellToRect( bottomRight );
-    if ( cellRect != wxGridNoCellRect )
+    tempCellRect = CellToRect(bottomRight);
+    if ( tempCellRect != wxGridNoCellRect )
     {
-        rect += cellRect;
+        resultRect += tempCellRect;
     }
     else
     {
+        // If both inputs were "wxGridNoCellRect," then there's nothing to do.
         return wxGridNoCellRect;
     }
 
-    int i, j;
-    int left = rect.GetLeft();
-    int top = rect.GetTop();
-    int right = rect.GetRight();
-    int bottom = rect.GetBottom();
+    // Ensure that left/right and top/bottom pairs are in order.
+    int left = resultRect.GetLeft();
+    int top = resultRect.GetTop();
+    int right = resultRect.GetRight();
+    int bottom = resultRect.GetBottom();
 
     int leftCol = topLeft.GetCol();
     int topRow = topLeft.GetRow();
@@ -10996,67 +11125,105 @@ wxRect wxGrid::BlockToDeviceRect( const wxGridCellCoords &topLeft,
 
     if (left > right)
     {
-        i = left;
+        int tmp = left;
         left = right;
-        right = i;
-        i = leftCol;
+        right = tmp;
+
+        tmp = leftCol;
         leftCol = rightCol;
-        rightCol = i;
+        rightCol = tmp;
     }
 
     if (top > bottom)
     {
-        i = top;
+        int tmp = top;
         top = bottom;
-        bottom = i;
-        i = topRow;
+        bottom = tmp;
+
+        tmp = topRow;
         topRow = bottomRow;
-        bottomRow = i;
+        bottomRow = tmp;
     }
 
-    for ( j = topRow; j <= bottomRow; j++ )
+    // The following loop is ONLY necessary to detect and handle merged cells.
+    int cw, ch;
+    m_gridWin->GetClientSize( &cw, &ch );
+
+    // Get the origin coordinates: notice that they will be negative if the
+    // grid is scrolled downwards/to the right.
+    int gridOriginX = 0;
+    int gridOriginY = 0;
+    CalcScrolledPosition(gridOriginX, gridOriginY, &gridOriginX, &gridOriginY);
+
+    int onScreenLeftmostCol = internalXToCol(-gridOriginX);
+    int onScreenUppermostRow = internalYToRow(-gridOriginY);
+
+    int onScreenRightmostCol = internalXToCol(-gridOriginX + cw);
+    int onScreenBottommostRow = internalYToRow(-gridOriginY + ch);
+
+    // Bound our loop so that we only examine the portion of the selected block
+    // that is shown on screen. Therefore, we compare the Top-Left block values
+    // to the Top-Left screen values, and the Bottom-Right block values to the
+    // Bottom-Right screen values, choosing appropriately.
+    const int visibleTopRow = wxMax(topRow, onScreenUppermostRow);
+    const int visibleBottomRow = wxMin(bottomRow, onScreenBottommostRow);
+    const int visibleLeftCol = wxMax(leftCol, onScreenLeftmostCol);
+    const int visibleRightCol = wxMin(rightCol, onScreenRightmostCol);
+
+    for ( int j = visibleTopRow; j <= visibleBottomRow; j++ )
     {
-        for ( i = leftCol; i <= rightCol; i++ )
+        for ( int i = visibleLeftCol; i <= visibleRightCol; i++ )
         {
-            if ((j == topRow) || (j == bottomRow) || (i == leftCol) || (i == rightCol))
+            if ( (j == visibleTopRow) || (j == visibleBottomRow) ||
+                    (i == visibleLeftCol) || (i == visibleRightCol) )
             {
-                cellRect = CellToRect( j, i );
+                tempCellRect = CellToRect( j, i );
 
-                if (cellRect.x < left)
-                    left = cellRect.x;
-                if (cellRect.y < top)
-                    top = cellRect.y;
-                if (cellRect.x + cellRect.width > right)
-                    right = cellRect.x + cellRect.width;
-                if (cellRect.y + cellRect.height > bottom)
-                    bottom = cellRect.y + cellRect.height;
+                if (tempCellRect.x < left)
+                    left = tempCellRect.x;
+                if (tempCellRect.y < top)
+                    top = tempCellRect.y;
+                if (tempCellRect.x + tempCellRect.width > right)
+                    right = tempCellRect.x + tempCellRect.width;
+                if (tempCellRect.y + tempCellRect.height > bottom)
+                    bottom = tempCellRect.y + tempCellRect.height;
             }
             else
             {
-                i = rightCol; // jump over inner cells.
+                i = visibleRightCol; // jump over inner cells.
             }
         }
     }
 
-    // convert to scrolled coords
-    //
+    // Convert to scrolled coords
     CalcScrolledPosition( left, top, &left, &top );
     CalcScrolledPosition( right, bottom, &right, &bottom );
 
-    int cw, ch;
-    m_gridWin->GetClientSize( &cw, &ch );
-
     if (right < 0 || bottom < 0 || left > cw || top > ch)
         return wxRect(0,0,0,0);
 
-    rect.SetLeft( wxMax(0, left) );
-    rect.SetTop( wxMax(0, top) );
-    rect.SetRight( wxMin(cw, right) );
-    rect.SetBottom( wxMin(ch, bottom) );
+    resultRect.SetLeft( wxMax(0, left) );
+    resultRect.SetTop( wxMax(0, top) );
+    resultRect.SetRight( wxMin(cw, right) );
+    resultRect.SetBottom( wxMin(ch, bottom) );
 
-    return rect;
+    return resultRect;
+}
+
+// ----------------------------------------------------------------------------
+// drop target
+// ----------------------------------------------------------------------------
+
+#if wxUSE_DRAG_AND_DROP
+
+// this allow setting drop target directly on wxGrid
+void wxGrid::SetDropTarget(wxDropTarget *dropTarget)
+{
+    GetGridWindow()->SetDropTarget(dropTarget);
 }
 
+#endif // wxUSE_DRAG_AND_DROP
+
 // ----------------------------------------------------------------------------
 // grid event classes
 // ----------------------------------------------------------------------------