make Scroll() itself virtual too as existing code might override it (but new code should override DoScroll() only); use the same access in the derived classes as in wxScrollHelperBase

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@57538 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/scrolwin.h

@@ -23,11 +23,12 @@ public:
     // implement base class pure virtuals
     virtual void AdjustScrollbars();
 
-private:
+protected:
     virtual void DoScroll(int x, int y);
     virtual void DoShowScrollbars(wxScrollbarVisibility horz,
                                   wxScrollbarVisibility vert);
 
+private:
     // helper of AdjustScrollbars(): does the work for the single scrollbar
     //
     // notice that the parameters passed by non-const references are modified

include/wx/gtk/scrolwin.h

@@ -22,6 +22,7 @@ public:
     // default ctor doesn't do anything
     wxScrollHelper(wxWindow *win) : wxScrollHelperBase(win) { }
 
+    // implement the base class methods
     virtual void SetScrollbars(int pixelsPerUnitX, int pixelsPerUnitY,
                                int noUnitsX, int noUnitsY,
                                int xPos = 0, int yPos = 0,
@@ -29,6 +30,11 @@ public:
     virtual void AdjustScrollbars();
 
 protected:
+    virtual void DoScroll(int x, int y);
+    virtual void DoShowScrollbars(wxScrollbarVisibility horz,
+                                  wxScrollbarVisibility vert);
+
+private:
     // this does (each) half of AdjustScrollbars() work
     void DoAdjustScrollbar(GtkRange* range,
                            int pixelsPerLine,
@@ -64,11 +70,6 @@ protected:
                         int pixelsPerLine,
                         int *posOld);
 
-    // implement the base class methods
-    virtual void DoScroll(int x, int y);
-    virtual void DoShowScrollbars(wxScrollbarVisibility horz,
-                                  wxScrollbarVisibility vert);
-
 private:
     DECLARE_NO_COPY_CLASS(wxScrollHelper)
 };

include/wx/scrolwin.h

@@ -70,8 +70,12 @@ public:
                                bool noRefresh = false );
 
     // scroll to the given (in logical coords) position
-    void Scroll(int x, int y) { DoScroll(x, y); }
-    void Scroll(const wxPoint& pt) { DoScroll(pt.x, pt.y); }
+    //
+    // notice that for backwards compatibility reasons Scroll() is virtual as
+    // the existing code could override it but new code should override
+    // DoScroll() instead
+    virtual void Scroll(int x, int y) { DoScroll(x, y); }
+    virtual void Scroll(const wxPoint& pt) { DoScroll(pt.x, pt.y); }
 
     // get/set the page size for this orientation (wxVERTICAL/wxHORIZONTAL)
     int GetScrollPageSize(int orient) const;