implemented ScrollLines/Pages() for all classes in wxGTK, not just wxTextCtrl (patch 1281503)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@37407 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/window.h

@@ -99,6 +99,8 @@ public:
     virtual int GetScrollRange( int orient ) const;
     virtual void ScrollWindow( int dx, int dy,
                                const wxRect* rect = (wxRect *) NULL );
+    virtual bool ScrollLines(int lines);
+    virtual bool ScrollPages(int pages);
 
 #if wxUSE_DRAG_AND_DROP
     virtual void SetDropTarget( wxDropTarget *dropTarget );
@@ -268,6 +270,10 @@ protected:
     // ApplyWidgetStyle -- override this, not ApplyWidgetStyle
     virtual void DoApplyWidgetStyle(GtkRcStyle *style);
 
+protected:
+    // GtkAdjustment to be used by Scroll{Lines,Pages}
+    void SetVScrollAdjustment(GtkAdjustment* adj);
+
 private:
     DECLARE_DYNAMIC_CLASS(wxWindowGTK)
     DECLARE_NO_COPY_CLASS(wxWindowGTK)