Make TAB behaviour in wxGrid more configurable.

Allow making TAB/Shift-TAB wrap to the next/previous row or going to the
next/previous control when the cursor is at the end/beginning of the current
row easily.

Also add wxEVT_GRID_TABBING event to allow customizing TAB behaviour even
further.

Update the sample to show the different possible standard behaviours and a
stupid example of a custom one (it would be probably more useful to implement
something a tad more realistic, e.g. tabbing to the next non-empty cell).

Closes #14711.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72672 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/grid/griddemo.h

@@ -42,6 +42,8 @@ class GridFrame : public wxFrame
     void SetNativeColHeader ( wxCommandEvent& );
     void SetCustomColHeader( wxCommandEvent& );
     void SetDefaultColHeader( wxCommandEvent& );
+    void SetTabBehaviour( wxCommandEvent& );
+    void SetTabCustomHandler( wxCommandEvent& );
     void ToggleGridLines( wxCommandEvent& );
     void AutoSizeCols( wxCommandEvent& );
     void CellOverflow( wxCommandEvent& );
@@ -102,6 +104,8 @@ class GridFrame : public wxFrame
     void OnSetHighlightWidth(wxCommandEvent&);
     void OnSetROHighlightWidth(wxCommandEvent&);
 
+    void OnGridCustomTab(wxGridEvent& event);
+
 public:
     GridFrame();
     ~GridFrame();
@@ -140,6 +144,10 @@ public:
         ID_COLDEFAULTHEADER,
         ID_COLNATIVEHEADER,
         ID_COLCUSTOMHEADER,
+        ID_TAB_STOP,
+        ID_TAB_WRAP,
+        ID_TAB_LEAVE,
+        ID_TAB_CUSTOM,
         ID_GRIDLINECOLOUR,
         ID_INSERTROW,
         ID_INSERTCOL,