// @(#)root/gui:$Id$
// Author: Reiner Rohlfs   30/09/98

/*************************************************************************
 * Copyright (C) 1995-2021, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

#ifndef ROOT_TGDoubleSlider
#define ROOT_TGDoubleSlider


#include "TGFrame.h"
#include "TGWidget.h"

class TGPicture;

enum EDoubleSliderSize {
   //--- sizes for vert. and horz. sliders
   kDoubleSliderWidth  = 24,
   kDoubleSliderHeight = kDoubleSliderWidth
};


enum EDoubleSliderScale {
   //--- type of slider scale
   kDoubleScaleNo        = BIT(0),
   kDoubleScaleDownRight = BIT(1),
   kDoubleScaleBoth      = BIT(2)
};


class TGDoubleSlider : public TGFrame, public TGWidget {

private:
   TGDoubleSlider(const TGDoubleSlider&) = delete;
   TGDoubleSlider& operator=(const TGDoubleSlider&) = delete;

protected:
   Double_t      fPos;           ///< logical position between fVmin and fVmax
   Double_t      fSmin;          ///< logical position of min value of Slider
   Double_t      fSmax;          ///< logical position of max value of Slider
   Int_t         fRelPos;        ///< slider position in pixel coordinates
   Double_t      fVmin;          ///< logical lower limit of slider
   Double_t      fVmax;          ///< logical upper limit of slider
   Int_t         fScale;         ///< tick mark scale
   Int_t         fScaleType;     ///< tick mark scale type (no, downright, both)
   Int_t         fPressPoint;    ///< mouse position at button press event
   Double_t      fPressSmin;     ///< logical min position at button press event
   Double_t      fPressSmax;     ///< logical max position at button press event
   Int_t         fMove;          ///< 1: move min value
                                 ///< 2: move max value
                                 ///< 3: move min and max value
                                 ///< 0: don't move any value
   Bool_t        fReversedScale; ///< reverse which end is min and max
   Bool_t        fMarkEnds;      ///< lines marking where stretch zones begin
   const TGPicture *fSliderPic;  ///< picture to draw slider ends

   TString       GetSString() const; ///< returns scaling type as string

   static void   FixBounds(Double_t &min, Double_t &max);
   void          ChangeCursor(Event_t *event);

public:
   TGDoubleSlider(const TGWindow *p = nullptr, UInt_t w = 1, UInt_t h = 1, UInt_t type = 1, Int_t id = -1,
                  UInt_t options = kChildFrame,
                  Pixel_t back = GetDefaultFrameBackground(),
                  Bool_t reversed = kFALSE,
                  Bool_t mark_ends = kFALSE);

   ~TGDoubleSlider() override { }

   Bool_t HandleButton(Event_t *event) override = 0;
   Bool_t HandleMotion(Event_t *event) override = 0;

   virtual void  SetScale(Int_t scale) { fScale = scale; }
   virtual void  SetRange(Float_t min, Float_t max) {
      SetRange((Double_t) min, (Double_t) max);
   }
   virtual void  SetRange(Long64_t min, Long64_t max) {
      SetRange((Double_t) min, (Double_t) max);
   }
   virtual void  SetRange(Int_t min, Int_t max) {
      SetRange((Double_t) min, (Double_t) max);
   }

   virtual void SetPosition(Float_t min, Float_t max) {
      SetPosition((Double_t) min, (Double_t) max);
   }
   virtual void SetPosition(Long64_t min, Long64_t max) {
      SetPosition((Double_t) min, (Double_t) max);
   }
   virtual void SetPosition(Int_t min, Int_t max) {
      SetPosition((Double_t) min, (Double_t) max);
   }

   virtual Float_t GetMinPosition() const {
      return (Float_t) GetMinPositionD();
   }
   virtual Float_t GetMaxPosition() const {
      return (Float_t) GetMaxPositionD();
   }
   virtual Long64_t GetMinPositionL() const {
      return (Long64_t)GetMinPositionD();
   }
   virtual Long64_t GetMaxPositionL() const {
      return (Long64_t)GetMaxPositionD();
   }

   virtual void GetPosition(Float_t &min, Float_t &max) const {
      if (fReversedScale) { min = (Float_t)(fVmin+fVmax-fSmax); max = (Float_t)(fVmin+fVmax-fSmin); }
      else { min = (Float_t)fSmin; max = (Float_t)fSmax; }
   }
   virtual void GetPosition(Float_t *min, Float_t *max) const {
      if (fReversedScale) { *min = (Float_t)(fVmin+fVmax-fSmax); *max = (Float_t)(fVmin+fVmax-fSmin); }
      else { *min = (Float_t)fSmin; *max = (Float_t)fSmax; }
   }
   virtual void GetPosition(Long64_t &min, Long64_t &max) const {
      if (fReversedScale) { min = (Long64_t)(fVmin+fVmax-fSmax); max = (Long64_t)(fVmin+fVmax-fSmin); }
      else { min = (Long64_t)fSmin; max = (Long64_t)fSmax; }
   }
   virtual void GetPosition(Long64_t *min, Long64_t *max) const {
      if (fReversedScale) { *min = (Long64_t)(fVmin+fVmax-fSmax); *max = (Long64_t)(fVmin+fVmax-fSmin); }
      else { *min = (Long64_t)fSmin; *max = (Long64_t)fSmax; }
   }

   // double precision methods

   virtual void  SetRange(Double_t min, Double_t max) {
      fVmin = min; fVmax = max;
      FixBounds(fVmin, fVmax);
   }

   virtual void SetPosition(Double_t min, Double_t max) {
      if (fReversedScale) { fSmin = fVmin+fVmax-max; fSmax = fVmin+fVmax-min; }
      else { fSmin = min; fSmax = max; }
      fClient->NeedRedraw(this);
   }

   virtual Double_t GetMinPositionD() const {
      if (fReversedScale) return fVmin+fVmax-fSmax;
      else return fSmin;
   }
   virtual Double_t GetMaxPositionD() const {
      if (fReversedScale) return fVmin+fVmax-fSmin;
      else return fSmax;
   }
   virtual void GetPosition(Double_t &min, Double_t &max) const {
      if (fReversedScale) { min = fVmin+fVmax-fSmax; max = fVmin+fVmax-fSmin; }
      else { min = fSmin; max = fSmax; }
   }
   virtual void GetPosition(Double_t *min, Double_t *max) const {
      if (fReversedScale) { *min = fVmin+fVmax-fSmax; *max = fVmin+fVmax-fSmin; }
      else { *min = fSmin; *max = fSmax; }
   }

   void  MapSubwindows() override { TGWindow::MapSubwindows(); }

   virtual void  PositionChanged() { Emit("PositionChanged()"); } //*SIGNAL*
   virtual void  Pressed() { Emit("Pressed()"); }                 //*SIGNAL*
   virtual void  Released() { Emit("Released()"); }               //*SIGNAL*

   ClassDefOverride(TGDoubleSlider,0)  // Double slider widget abstract base class
};


class TGDoubleVSlider : public TGDoubleSlider {

protected:
   Int_t   fYp;      ///< vertical slider y position in pixel coordinates

   void DoRedraw() override;

public:
   TGDoubleVSlider(const TGWindow *p = nullptr, UInt_t h = 1, UInt_t type = 1, Int_t id = -1,
                   UInt_t options = kVerticalFrame,
                   Pixel_t back = GetDefaultFrameBackground(),
                   Bool_t reversed = kFALSE,
                   Bool_t mark_ends = kFALSE);

   ~TGDoubleVSlider() override;

   Bool_t HandleButton(Event_t *event) override;
   Bool_t HandleMotion(Event_t *event) override;
   TGDimension GetDefaultSize() const override
               { return TGDimension(kDoubleSliderWidth, fHeight); }
   void SavePrimitive(std::ostream &out, Option_t *option = "") override;

   ClassDefOverride(TGDoubleVSlider,0)  // Vertical double slider widget
};


class TGDoubleHSlider : public TGDoubleSlider {

protected:
   Int_t       fXp;     ///< horizontal slider x position in pixel coordinates

   void DoRedraw() override;

public:
   TGDoubleHSlider(const TGWindow *p = nullptr, UInt_t w = 1, UInt_t type = 1, Int_t id = -1,
                   UInt_t options = kHorizontalFrame,
                   Pixel_t back = GetDefaultFrameBackground(),
                   Bool_t reversed = kFALSE,
                   Bool_t mark_ends = kFALSE);

   ~TGDoubleHSlider() override;

   Bool_t HandleButton(Event_t *event) override;
   Bool_t HandleMotion(Event_t *event) override;
   TGDimension GetDefaultSize() const override
                { return TGDimension(fWidth, kDoubleSliderHeight); }
   void   SavePrimitive(std::ostream &out, Option_t *option = "") override;

   ClassDefOverride(TGDoubleHSlider,0)  // Horizontal double slider widget
};

#endif