Add support for editing dates (without time) to wxGrid

Add wxGridCellDateRenderer and wxGridCellDateRenderer which can be used
for the grid cells containing only dates, without times.

Also add wxGrid::SetColFormatDate() convenience function.

Refactor wxGridCellDateTimeRenderer slightly to reuse its code.

Closes https://github.com/wxWidgets/wxWidgets/pull/1101

include/wx/generic/grid.h

@@ -48,6 +48,7 @@ extern WXDLLIMPEXP_DATA_CORE(const char) wxGridNameStr[];
 #define wxGRID_VALUE_NUMBER     wxT("long")
 #define wxGRID_VALUE_FLOAT      wxT("double")
 #define wxGRID_VALUE_CHOICE     wxT("choice")
+#define wxGRID_VALUE_DATE       wxT("date")
 
 #define wxGRID_VALUE_TEXT wxGRID_VALUE_STRING
 #define wxGRID_VALUE_LONG wxGRID_VALUE_NUMBER
@@ -99,6 +100,9 @@ class WXDLLIMPEXP_FWD_CORE wxTextCtrl;
 #if wxUSE_SPINCTRL
 class WXDLLIMPEXP_FWD_CORE wxSpinCtrl;
 #endif
+#if wxUSE_DATEPICKCTRL
+class WXDLLIMPEXP_FWD_CORE wxDatePickerCtrl;
+#endif
 
 class wxGridFixedIndicesSet;
 
@@ -1354,6 +1358,7 @@ public:
     void     SetColFormatBool(int col);
     void     SetColFormatNumber(int col);
     void     SetColFormatFloat(int col, int width = -1, int precision = -1);
+    void     SetColFormatDate(int col, const wxString& format = wxString());
     void     SetColFormatCustom(int col, const wxString& typeName);
 
     // ------ row and col formatting

include/wx/generic/gridctrl.h

@@ -153,12 +153,17 @@ private:
 
 #include "wx/datetime.h"
 
-// the default renderer for the cells containing times and dates
-class WXDLLIMPEXP_ADV wxGridCellDateTimeRenderer : public wxGridCellStringRenderer
+// renderer for the cells containing dates only, without time component
+class WXDLLIMPEXP_ADV wxGridCellDateRenderer : public wxGridCellStringRenderer
 {
 public:
-    wxGridCellDateTimeRenderer(const wxString& outformat = wxDefaultDateTimeFormat,
-                               const wxString& informat = wxDefaultDateTimeFormat);
+    explicit wxGridCellDateRenderer(const wxString& outformat = wxString());
+
+    wxGridCellDateRenderer(const wxGridCellDateRenderer& other)
+        : m_oformat(other.m_oformat),
+          m_tz(other.m_tz)
+    {
+    }
 
     // draw the string right aligned
     virtual void Draw(wxGrid& grid,
@@ -180,11 +185,33 @@ public:
 
 protected:
     wxString GetString(const wxGrid& grid, int row, int col);
+    virtual bool Parse(const wxString& text, wxDateTime& result);
+
+    wxString m_oformat;
+    wxDateTime::TimeZone m_tz;
+};
+
+// the default renderer for the cells containing times and dates
+class WXDLLIMPEXP_ADV wxGridCellDateTimeRenderer : public wxGridCellDateRenderer
+{
+public:
+    wxGridCellDateTimeRenderer(const wxString& outformat = wxDefaultDateTimeFormat,
+                               const wxString& informat = wxDefaultDateTimeFormat);
+
+    wxGridCellDateTimeRenderer(const wxGridCellDateTimeRenderer& other)
+        : wxGridCellDateRenderer(other),
+          m_iformat(other.m_iformat),
+          m_dateDef(other.m_dateDef)
+    {
+    }
+
+    virtual wxGridCellRenderer *Clone() const wxOVERRIDE;
+
+protected:
+    virtual bool Parse(const wxString& text, wxDateTime& result) wxOVERRIDE;
 
     wxString m_iformat;
-    wxString m_oformat;
     wxDateTime m_dateDef;
-    wxDateTime::TimeZone m_tz;
 };
 
 #endif // wxUSE_DATETIME

include/wx/generic/grideditors.h

@@ -373,6 +373,41 @@ public:
     wxDECLARE_NO_COPY_CLASS(wxGridCellAutoWrapStringEditor);
 };
 
+#if wxUSE_DATEPICKCTRL
+
+class WXDLLIMPEXP_ADV wxGridCellDateEditor : public wxGridCellEditor
+{
+public:
+    wxGridCellDateEditor() { }
+
+    virtual void Create(wxWindow* parent,
+                        wxWindowID id,
+                        wxEvtHandler* evtHandler) wxOVERRIDE;
+
+    virtual void SetSize(const wxRect& rect) wxOVERRIDE;
+
+    virtual void BeginEdit(int row, int col, wxGrid* grid) wxOVERRIDE;
+    virtual bool EndEdit(int row, int col, const wxGrid* grid,
+                         const wxString& oldval, wxString *newval) wxOVERRIDE;
+    virtual void ApplyEdit(int row, int col, wxGrid* grid) wxOVERRIDE;
+
+    virtual void Reset() wxOVERRIDE;
+
+    virtual wxGridCellEditor *Clone() const wxOVERRIDE;
+
+    virtual wxString GetValue() const wxOVERRIDE;
+
+protected:
+    wxDatePickerCtrl* DatePicker() const;
+
+private:
+    wxDateTime m_value;
+
+    wxDECLARE_NO_COPY_CLASS(wxGridCellDateEditor);
+};
+
+#endif // wxUSE_DATEPICKCTRL
+
 #endif // wxUSE_GRID
 
 #endif // _WX_GENERIC_GRID_EDITORS_H_