Set/get for internal border in book based controls.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@35930 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/bookctrl.h

@@ -118,6 +118,15 @@ public:
     // calculate the size of the control from the size of its page
     virtual wxSize CalcSizeFromPage(const wxSize& sizePage) const = 0;
 
+    // get/set size of area between book control area and page area
+    inline unsigned int GetInternalBorder() const
+    {
+        return m_internalBorder;
+    }
+    void SetInternalBorder(unsigned int internalBorder)
+    {
+        m_internalBorder = internalBorder;
+    }
 
     // operations
     // ----------
@@ -192,13 +201,9 @@ protected:
     // helper: get the next page wrapping if we reached the end
     int GetNextPage(bool forward) const;
 
-    // common part of all ctors
-    void Init();
-
     // Always rely on GetBestSize, which will look at all the pages
     virtual void SetInitialBestSize(const wxSize& WXUNUSED(size)) { }
 
-
     // the array of all pages of this control
     wxArrayPages m_pages;
 
@@ -208,6 +213,13 @@ protected:
     // true if we must delete m_imageList
     bool m_ownsImageList;
 
+private:
+
+    // common part of all ctors
+    void Init();
+
+    // internal border
+    unsigned int m_internalBorder;
 
     DECLARE_NO_COPY_CLASS(wxBookCtrlBase)
 };