On screens with restricted space, it's useful to be able to add controls

to e.g. the wxChoice control of a wxChoicebook. GetControlSizer
allows an app to do that, and we also add a control margin which
may or may not be respected by individual book controls.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@38698 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/bookctrl.h

@@ -128,6 +128,10 @@ public:
         m_internalBorder = internalBorder;
     }
 
+    // Sets/gets the margin around the controller
+    void SetControlMargin(int margin) { m_controlMargin = margin; }
+    int GetControlMargin() const { return m_controlMargin; }
+
     // returns true if we have wxCHB_TOP or wxCHB_BOTTOM style
     bool IsVertical() const { return HasFlag(wxBK_BOTTOM | wxBK_TOP); }
 
@@ -135,6 +139,9 @@ public:
     void SetFitToCurrentPage(bool fit) { m_fitToCurrentPage = fit; }
     bool GetFitToCurrentPage() const { return m_fitToCurrentPage; }
 
+    // returns the sizer containing the control, if any
+    wxSizer* GetControlSizer() const { return m_controlSizer; }
+
     // operations
     // ----------
 
@@ -236,6 +243,12 @@ protected:
     // Whether to shrink to fit current page
     bool m_fitToCurrentPage;
 
+    // the sizer containing the choice control
+    wxSizer*    m_controlSizer;
+
+    // the margin around the choice control
+    int         m_controlMargin;
+
 private:
 
     // common part of all ctors