[TD]add alignment grid to page

src/Mod/TechDraw/Gui/ViewProviderPage.h

@@ -25,6 +25,8 @@
 #ifndef DRAWINGGUI_VIEWPROVIDERPAGE_H
 #define DRAWINGGUI_VIEWPROVIDERPAGE_H
 
+#include <Mod/TechDraw/TechDrawGlobal.h>
+
 #include <QPointer>
 #include <Gui/ViewProviderDocumentObject.h>
 
@@ -50,6 +52,8 @@ public:
     virtual ~ViewProviderPage();
 
     App::PropertyBool  ShowFrames;
+    App::PropertyBool  ShowGrid;
+    App::PropertyInteger GridSpacing;
 
     virtual void attach(App::DocumentObject *) override;
     virtual void setDisplayMode(const char* ModeName) override;
@@ -94,6 +98,7 @@ public:
     QGVPage *getGraphicsView() { return m_graphicsView; }
     void setGraphicsView(QGVPage* gv);
     virtual bool canDelete(App::DocumentObject* obj) const override;
+    void  setGrid(void);
 
 protected:
     bool setEdit(int ModNum) override;
@@ -103,6 +108,9 @@ private:
     bool m_docReady;
     std::string m_pageName;
     QGVPage* m_graphicsView;
+    bool m_showGrid;
+    int  m_gridStep;
+
 };
 
 } // namespace TechDrawGui