#ifndef GUIRULER_HEADER
#define GUIRULER_HEADER 1
///////////////////////////////////////////////////////////////
//! rcsid="$Id: Ruler.hh,v 1.4 2000/07/07 12:59:23 ees1cg Exp $"
//! file="amma/GUI/GTK/Ruler.hh"
//! lib=GUI
//! docentry="GUI.Widget"
//! author="Charles Galambos"
//! date="23/09/99"

#include "amma/GUI/Widget.hh"

//! userlevel=Develop
//: Ruler body.

class GUIRulerBodyC
  : public GUIWidgetBodyC
{
public:
  GUIRulerBodyC(BooleanT nVert,RealT nlower,RealT nupper,RealT npos,RealT nmaxSize)
    : vert(nVert),
      lower(nlower),
      upper(nupper),
      position(npos),
      max_size(nmaxSize)
    {}
  //: Ruler body
  
  BooleanT GUIAttachTo(GUIWidgetC &widge);
  //: Get motion events from widge.
  // GUI Thread only.

  void GUISetRange(RealT lower,RealT upper);
  //: Set range of ruler.
  // GUI Thread only.
  
protected:
  virtual BooleanT Create();
  //: Create widget
  
  BooleanT vert;  // TRUE = Vertical.
  RealT lower;    // The upper limit of the ruler (in points) 
  RealT upper;    // The lower limit of the ruler 
  RealT position; // The position of the mark on the ruler 
  RealT max_size; // The maximum size of the ruler 
};


//! userlevel=Normal
//: Ruler .

class GUIRulerC
  : public GUIWidgetC
{
public:
  GUIRulerC()
    : DPEntityC(true)
    {}
  //: Default constructor.
  // Creates an invalid handle.
  
  GUIRulerC(BooleanT nVert,RealT nlower = 0,RealT nupper = 1,RealT npos = 0.5,RealT nmaxSize = 1)
    : DPEntityC(* new GUIRulerBodyC(nVert,nlower,nupper,npos,nmaxSize))
    {}
  //: Constructor.
  
protected:
  GUIRulerBodyC &Body() 
    { return dynamic_cast<GUIRulerBodyC &>(DPEntityC::Body()); }
  //: Access body.

  const GUIRulerBodyC &Body() const
    { return dynamic_cast<const GUIRulerBodyC &>(DPEntityC::Body()); }
  //: Access body.

  void GUIAttachTo(GUIWidgetC &widge)
    { Body().GUIAttachTo(widge); }
  //: Get motion events from widge.
  // GUI Thread only.
  
  void GUISetRange(RealT &lower,RealT &upper)
    { Body().GUISetRange(lower,upper); }
  //: Set range of ruler.
  // GUI Thread only.
  
public:
  BooleanT AttachTo(GUIWidgetC &widge);
  //: Get motion events from 'widge', for ruler position. 
  // Thread safe.
  
  void SetRange(RealT lower,RealT upper);
  //: Set range for ruler.
  // Thread safe.
};

#endif