TGDoubleSlider.cxx

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// @(#)root/gui:$Id$
// Author: Reiner Rohlfs   30/09/98
 
/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
/**************************************************************************
 
    This source is based on Xclass95, a Win95-looking GUI toolkit.
    Copyright (C) 1996, 1997 David Barth, Ricky Ralston, Hector Peraza.
 
    Xclass95 is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
 
**************************************************************************/
 
 
/** \class TGDoubleSlider
    \ingroup guiwidgets
 
DoubleSlider widgets allow easy selection of a min and a max value
out of a range.
DoubleSliders can be either horizontal or vertical oriented and
there is a choice of three different types of tick marks.
 
To change the min value press the mouse near to the left / bottom
edge of the slider.
To change the max value press the mouse near to the right / top
edge of the slider.
To change both values simultaneously press the mouse near to the
center of the slider.
 
TGDoubleSlider is an abstract base class. Use the concrete
TGDoubleVSlider and TGDoubleHSlider.
 
 
\class  TGDoubleVSlider
\ingroup guiwidgets
 
Dragging the slider will generate the event:
  - kC_VSLIDER, kSL_POS, slider id, 0
 
Pressing the mouse will generate the event:
  - kC_VSLIDER, kSL_PRESS, slider id, 0
 
Releasing the mouse will generate the event:
  - kC_VSLIDER, kSL_RELEASE, slider id, 0
 
Use the functions GetMinPosition(), GetMaxPosition() and
GetPosition() to retrieve the position of the slider.
 
 
\class  TGDoubleHSlider
\ingroup guiwidgets
 
Dragging the slider will generate the event:
  - kC_HSLIDER, kSL_POS, slider id, 0
 
Pressing the mouse will generate the event:
  - kC_HSLIDER, kSL_PRESS, slider id, 0
 
Releasing the mouse will generate the event:
  - kC_HSLIDER, kSL_RELEASE, slider id, 0
 
Use the functions GetMinPosition(), GetMaxPosition() and
GetPosition() to retrieve the position of the slider.
 
*/
 
 
#include "TGDoubleSlider.h"
#include "TGPicture.h"
#include "TSystem.h"
#include "TVirtualX.h"
 
#include <iostream>
 
 
ClassImp(TGDoubleSlider);
ClassImp(TGDoubleVSlider);
ClassImp(TGDoubleHSlider);
 
////////////////////////////////////////////////////////////////////////////////
/// Slider constructor.
 
TGDoubleSlider::TGDoubleSlider(const TGWindow *p, UInt_t w, UInt_t h, UInt_t type, Int_t id,
                               UInt_t options, Pixel_t back,
                               Bool_t reversed, Bool_t mark_ends)
   : TGFrame(p, w, h, options, back)
{
   fSliderPic = 0;
 
   fWidgetId    = id;
   fWidgetFlags = kWidgetWantFocus;
   fMsgWindow   = p;
 
   fScaleType = type;
   fScale = 10;
   fMove = 0;
 
   fPos = fSmin = fSmax = 0.0;
   fRelPos = 0;
   fVmin = fVmax = 0.0;
   fPressPoint = 0;
   fPressSmin = fPressSmax = 0.0;
 
   fReversedScale = reversed;
   fMarkEnds = mark_ends;
 
   gVirtualX->GrabButton(fId, kAnyButton, kAnyModifier,
                         kButtonPressMask | kButtonReleaseMask |
                         kPointerMotionMask, kNone, kNone);
   AddInput(kPointerMotionMask);
   SetWindowName();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Avoid boundaries to be equal.
 
void TGDoubleSlider::FixBounds(Double_t &min, Double_t &max)
{
   if (min > max) min = max;
 
   Double_t eps = 1e-6;
   if (max - min < eps) {
      if (max == 0)
         max += eps;
      else
         max += max*eps;
      if (min == 0)
         min -= eps;
      else
         min -= min*eps;
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Returns the slider type as a string - used in SavePrimitive()
 
TString TGDoubleSlider::GetSString() const
{
   TString stype;
 
   if (fScaleType) {
      if (fScaleType & kDoubleScaleNo)  {
         if (stype.Length() == 0)
            stype  = "kDoubleScaleNo";
         else
            stype += " | kDoubleScaleNo";
      }
      if (fScaleType & kDoubleScaleDownRight) {
         if (stype.Length() == 0)
            stype  = "kDoubleScaleDownRight";
         else
            stype += " | kDoubleScaleDownRight";
      }
      if (fScaleType & kDoubleScaleBoth) {
         if (stype.Length() == 0)
            stype  = "kDoubleScaleBoth";
         else
            stype += " | kDoubleScaleBoth";
      }
   }
   return stype;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Change the cursor shape depending on the slider area.
 
void TGDoubleSlider::ChangeCursor(Event_t *event)
{
   static Cursor_t topCur = kNone, leftCur = kNone;
   static Cursor_t botCur = kNone, rightCur = kNone;
   Int_t hw = 0, wh = 0, xy = 0, yx = 0;
   Cursor_t minCur = kNone, maxCur = kNone;
 
   if (topCur == kNone)
      topCur    = gVirtualX->CreateCursor(kTopSide);
   if (leftCur == kNone)
      leftCur   = gVirtualX->CreateCursor(kLeftSide);
   if (botCur == kNone)
      botCur    = gVirtualX->CreateCursor(kBottomSide);
   if (rightCur == kNone)
      rightCur  = gVirtualX->CreateCursor(kRightSide);
   if (GetOptions() & kVerticalFrame) {
      hw = (Int_t)fWidth;
      wh = (Int_t)fHeight;
      xy = (Int_t)event->fX;
      yx = (Int_t)event->fY;
      minCur = topCur;
      maxCur = botCur;
   }
   else if (GetOptions() & kHorizontalFrame) {
      hw  = (Int_t)fHeight;
      wh  = (Int_t)fWidth;
      xy  = (Int_t)event->fY;
      yx  = (Int_t)event->fX;
      minCur = leftCur;
      maxCur = rightCur;
   }
   else return;
 
   Int_t relMin = (Int_t)((wh-16) * (fSmin - fVmin) / (fVmax - fVmin)) + 1;
   Int_t relMax = (Int_t)((wh-16) * (fSmax - fVmin) / (fVmax - fVmin) + 15);
   // constrain to the slider width
   if (xy > hw/2-7 && xy < hw/2+7 && fMove != 3) {
      // if the mouse pointer is in the top resizing zone,
      // and we are not already moving the bottom side,
      // set the cursor shape as TopSide
      if ((yx <= (relMax - relMin) / 4 + relMin) &&
          (yx >= relMin) && (fMove != 2))
         gVirtualX->SetCursor(fId, minCur);
      // if the mouse pointer is in the bottom resizing zone,
      // and we are not already moving the top side,
      // set the cursor shape as BottomSide
      else if ((yx >= (relMax - relMin) / 4 * 3 + relMin) &&
               (yx <= relMax) && (fMove != 1))
         gVirtualX->SetCursor(fId, maxCur);
      // if we are not moving any side, restore the cursor
      else if ((fMove < 1) || (fMove > 2))
         gVirtualX->SetCursor(fId, kNone);
   }
   // if we are not inside the slider, and not moving any side,
   // restore the cursor
   else if ((fMove < 1) || (fMove > 2))
      gVirtualX->SetCursor(fId, kNone);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create a vertical slider widget.
 
TGDoubleVSlider::TGDoubleVSlider(const TGWindow *p, UInt_t h, UInt_t type, Int_t id,
                                 UInt_t options, ULong_t back,
                                 Bool_t reversed, Bool_t mark_ends)
    : TGDoubleSlider(p, kDoubleSliderWidth, h, type, id, options, back,
                     reversed, mark_ends)
{
   fYp = 0;
   fSliderPic = fClient->GetPicture("sliderv.xpm");
 
   if (!fSliderPic)
      Error("TGDoubleVSlider", "sliderv.xpm not found");
   // set initial values
   fSmin = h/8*3; fSmax = h/8*5; fVmin = 0; fVmax = h;
   FixBounds(fVmin, fVmax);
   SetWindowName();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Delete vertical slider widget.
 
TGDoubleVSlider::~TGDoubleVSlider()
{
   if (fSliderPic) fClient->FreePicture(fSliderPic);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Redraw vertical slider widget.
 
void TGDoubleVSlider::DoRedraw()
{
   FixBounds(fVmin, fVmax);
 
   // cleanup the drawable
   gVirtualX->ClearWindow(fId);
 
   if (fSmin < fVmin) fSmin = fVmin;
   if (fSmax < fVmin) fSmax = fVmin;
   if (fSmin > fVmax) fSmin = fVmax;
   if (fSmax > fVmax) fSmax = fVmax;
   if (fSmin > fSmax) fSmin = fSmax = (fSmin + fSmax) / 2;
 
   int relMin = (int)((fHeight-16) * (fSmin - fVmin) / (fVmax - fVmin)) + 1;
   int relMax = (int)((fHeight-16) * (fSmax - fVmin) / (fVmax - fVmin) + 15);
 
   gVirtualX->DrawLine(fId, GetHilightGC()(), fWidth/2-6, relMin, fWidth/2+5, relMin);
   gVirtualX->DrawLine(fId, GetHilightGC()(), fWidth/2-6, relMin, fWidth/2-6, relMax);
   gVirtualX->DrawLine(fId, GetBlackGC()(),   fWidth/2+5, relMax, fWidth/2-6, relMax);
   gVirtualX->DrawLine(fId, GetBlackGC()(),   fWidth/2+5, relMax, fWidth/2+5, relMin);
 
   if (relMin-1 > 8) {
      gVirtualX->DrawLine(fId, GetShadowGC()(),  fWidth/2-1, 8, fWidth/2-1, relMin-1);
      gVirtualX->DrawLine(fId, GetHilightGC()(), fWidth/2+1, 8, fWidth/2+1, relMin-1);
      gVirtualX->DrawLine(fId, GetBlackGC()(),   fWidth/2,   8, fWidth/2,   relMin-1);
   }
   if (relMax+1 < (int)fHeight-8) {
      gVirtualX->DrawLine(fId, GetShadowGC()(),  fWidth/2-1, relMax+1, fWidth/2-1, fHeight-8);
      gVirtualX->DrawLine(fId, GetHilightGC()(), fWidth/2+1, relMax+1, fWidth/2+1, fHeight-8);
      gVirtualX->DrawLine(fId, GetBlackGC()(),   fWidth/2,   relMax+1, fWidth/2,   fHeight-8);
   }
 
   // check scale
   if (fScale == 1) fScale++;
   if (fScale * 2 > (int)fHeight) fScale = 0;
   if (fScale > 0 && !(fScaleType & kDoubleScaleNo)) {
      int lines = ((int)fHeight-16) / fScale;
      int remain = ((int)fHeight-16) % fScale;
      if (lines < 1) lines = 1;
      for (int i = 0; i <= lines; i++) {
         int y = i * fScale + (i * remain) / lines;
         gVirtualX->DrawLine(fId, GetBlackGC()(), fWidth/2+8, y+7, fWidth/2+10, y+7);
         if ((fScaleType & kDoubleScaleBoth))
            gVirtualX->DrawLine(fId, GetBlackGC()(), fWidth/2-9, y+7, fWidth/2-11, y+7);
      }
   }
 
   if (fSliderPic) {
      Int_t xpos = (fWidth/2) - (fSliderPic->GetWidth()/2);
      Int_t ypos = relMin + 2;
      fSliderPic->Draw(fId, GetBckgndGC()(), xpos, ypos);
      ypos = relMax - fSliderPic->GetHeight() - 2;
      fSliderPic->Draw(fId, GetBckgndGC()(), xpos, ypos);
   }
   if (fMarkEnds) {
      // Draw scaling zones.
      int y1 = (relMax - relMin) / 4 + relMin;
      int y2 = (relMax - relMin) / 4 * 3 + relMin;
      gVirtualX->DrawLine(fId, GetBlackGC()(), fWidth/2-6, y1, fWidth/2+5, y1);
      gVirtualX->DrawLine(fId, GetBlackGC()(), fWidth/2-6, y2, fWidth/2+5, y2);
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle mouse button event in vertical slider.
 
Bool_t TGDoubleVSlider::HandleButton(Event_t *event)
{
   if (event->fType == kButtonPress && event->fCode == kButton1) {
      // constrain to the slider width
      if (event->fX < (Int_t)fWidth/2-7 || event->fX > (Int_t)fWidth/2+7) {
         return kTRUE;
      }
      fPressPoint = event->fY;
      fPressSmin  = fSmin;
      fPressSmax  = fSmax;
 
      int relMin = (int)((fHeight-16) * (fSmin - fVmin) / (fVmax - fVmin)) + 1;
      int relMax = (int)((fHeight-16) * (fSmax - fVmin) / (fVmax - fVmin) + 15);
      if (fPressPoint < (relMax - relMin) / 4 + relMin)
         // move only min value
         fMove = 1;
      else if (fPressPoint > (relMax - relMin) / 4 * 3 + relMin)
         // move only max value
         fMove = 2;
      else
         // move min and max value
         fMove = 3;
 
      SendMessage(fMsgWindow, MK_MSG(kC_VSLIDER, kSL_PRESS), fWidgetId, 0);
      fClient->ProcessLine(fCommand, MK_MSG(kC_VSLIDER, kSL_PRESS), fWidgetId, 0);
      Pressed();
 
      // last argument kFALSE forces all specified events to this window
      gVirtualX->GrabPointer(fId, kButtonPressMask | kButtonReleaseMask |
                             kPointerMotionMask, kNone, kNone,
                             kTRUE, kFALSE);
   } else if (event->fType == kButtonRelease && event->fCode == kButton1) {
      SendMessage(fMsgWindow, MK_MSG(kC_VSLIDER, kSL_RELEASE), fWidgetId, 0);
      fClient->ProcessLine(fCommand, MK_MSG(kC_VSLIDER, kSL_RELEASE), fWidgetId, 0);
      Released();
      fMove = 0;
 
      gVirtualX->GrabPointer(0, 0, 0, 0, kFALSE);  // ungrab pointer
   } else
      fMove = 0;
 
   return kTRUE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle mouse motion event in vertical slider.
 
Bool_t TGDoubleVSlider::HandleMotion(Event_t *event)
{
   ChangeCursor(event);
   if (fMove == 0) return kTRUE;
 
   static Long64_t was = gSystem->Now();
   Long64_t now = gSystem->Now();
 
   if ((now-was) < 50) return kTRUE;
   was = now;
 
   int       diff;
   Double_t  oldMin, oldMax;
 
   diff    = event->fY - fPressPoint;
   oldMin  = fSmin;
   oldMax  = fSmax;
 
   if (fMove == 1) {
      // change of min value
      fSmin = fPressSmin + diff * (fVmax - fVmin) / (fHeight-16);
      if (fSmin < fVmin) fSmin = fVmin;
      if (fSmin > fSmax) fSmin = fSmax;
   } else if (fMove == 2) {
      // change of max value
      fSmax = fPressSmax + diff * (fVmax - fVmin) / (fHeight-16);
      if (fSmax > fVmax) fSmax = fVmax;
      if (fSmax < fSmin) fSmax = fSmin;
   } else if (fMove == 3) {
      // change of min and of max value
      Double_t logicalDiff;
      logicalDiff = diff * (fVmax - fVmin) / (fHeight-16);
      if (fPressSmax + logicalDiff > fVmax)
         logicalDiff = fVmax - fPressSmax;
      if (fPressSmin + logicalDiff < fVmin)
         logicalDiff = fVmin - fPressSmin;
      fSmax = fPressSmax + logicalDiff;
      fSmin = fPressSmin + logicalDiff;
   }
 
   // check if position has changed
   if (fMove != 0 && (fSmax != oldMax || fSmin != oldMin)) {
      fClient->NeedRedraw(this);
      SendMessage(fMsgWindow, MK_MSG(kC_VSLIDER, kSL_POS), fWidgetId, 0);
      fClient->ProcessLine(fCommand, MK_MSG(kC_VSLIDER, kSL_POS), fWidgetId, 0);
      PositionChanged();
   }
   return kTRUE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Create horizontal slider widget.
 
TGDoubleHSlider::TGDoubleHSlider(const TGWindow *p, UInt_t w, UInt_t type, Int_t id,
                                 UInt_t options, ULong_t back,
                                 Bool_t reversed, Bool_t mark_ends)
    : TGDoubleSlider(p, w, kDoubleSliderHeight, type, id, options, back,
                     reversed, mark_ends)
{
   fXp = 0;
   fSliderPic = fClient->GetPicture("sliderh.xpm");
 
   if (!fSliderPic)
      Error("TGDoubleHSlider", "sliderh.xpm not found");
   // set initial values
   fSmin = w/8*3; fSmax = w/8*5; fVmin = 0; fVmax = w;
   FixBounds(fVmin, fVmax);
   SetWindowName();
}
 
////////////////////////////////////////////////////////////////////////////////
/// Delete a horizontal slider widget.
 
TGDoubleHSlider::~TGDoubleHSlider()
{
   if (fSliderPic) fClient->FreePicture(fSliderPic);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Redraw horizontal slider widget.
 
void TGDoubleHSlider::DoRedraw()
{
   FixBounds(fVmin, fVmax);
 
   // cleanup drawable
   gVirtualX->ClearWindow(fId);
 
   if (fSmin < fVmin) fSmin = fVmin;
   if (fSmax > fVmax) fSmax = fVmax;
   if (fSmin > fSmax) fSmin = fSmax = (fSmin + fSmax) / 2;
 
   int relMin = (int)((fWidth-16) * (fSmin - fVmin) / (fVmax - fVmin)) + 1;
   int relMax = (int)((fWidth-16) * (fSmax - fVmin) / (fVmax - fVmin) + 15);
 
   gVirtualX->DrawLine(fId, GetHilightGC()(), relMin, fHeight/2-6, relMin, fHeight/2+5);
   gVirtualX->DrawLine(fId, GetHilightGC()(), relMax, fHeight/2-6, relMin, fHeight/2-6);
   gVirtualX->DrawLine(fId, GetBlackGC()(),   relMax, fHeight/2+5, relMax, fHeight/2-6);
   gVirtualX->DrawLine(fId, GetBlackGC()(),   relMin, fHeight/2+5, relMax, fHeight/2+5);
 
   if (relMin-1 > 8) {
      gVirtualX->DrawLine(fId, GetShadowGC()(),  8, fHeight/2-1, relMin-1, fHeight/2-1);
      gVirtualX->DrawLine(fId, GetHilightGC()(), 8, fHeight/2+1, relMin-1, fHeight/2+1);
      gVirtualX->DrawLine(fId, GetBlackGC()(),   8, fHeight/2,   relMin-1, fHeight/2);
   }
   if (relMax+1 < (int)fWidth-8) {
      gVirtualX->DrawLine(fId, GetShadowGC()(),  relMax+1, fHeight/2-1, fWidth-8, fHeight/2-1);
      gVirtualX->DrawLine(fId, GetHilightGC()(), relMax+1, fHeight/2+1, fWidth-8, fHeight/2+1);
      gVirtualX->DrawLine(fId, GetBlackGC()(),   relMax+1, fHeight/2,   fWidth-8, fHeight/2);
   }
 
   if (fScale == 1) fScale++;
   if (fScale * 2 > (int)fWidth) fScale = 0;
   if (fScale > 0 && !(fScaleType & kDoubleScaleNo)) {
      int lines = ((int)fWidth-16) / fScale;
      int remain = ((int)fWidth-16) % fScale;
      if (lines < 1) lines = 1;
      for (int i = 0; i <= lines; i++) {
         int x = i * fScale + (i * remain) / lines;
         gVirtualX->DrawLine(fId, GetBlackGC()(), x+7, fHeight/2+8, x+7, fHeight/2+10);
         if ((fScaleType & kDoubleScaleBoth))
            gVirtualX->DrawLine(fId, GetBlackGC()(), x+7, fHeight/2-9, x+7, fHeight/2-11);
      }
   }
 
   if (fSliderPic) {
      Int_t ypos = (fHeight/2) - (fSliderPic->GetHeight()/2);
      Int_t xpos = relMin + 2;
      fSliderPic->Draw(fId, GetBckgndGC()(), xpos, ypos);
      xpos = relMax - fSliderPic->GetWidth() - 2;
      fSliderPic->Draw(fId, GetBckgndGC()(), xpos, ypos);
   }
   if (fMarkEnds) {
      // Draw scaling zones.
      int x1 = (relMax - relMin) / 4 + relMin;
      int x2 = (relMax - relMin) / 4 * 3 + relMin;
      gVirtualX->DrawLine(fId, GetBlackGC()(), x1, fHeight/2-6, x1, fHeight/2+5);
      gVirtualX->DrawLine(fId, GetBlackGC()(), x2, fHeight/2-6, x2, fHeight/2+5);
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle mouse button event in horizontal slider widget.
 
Bool_t TGDoubleHSlider::HandleButton(Event_t *event)
{
   if (event->fType == kButtonPress && event->fCode == kButton1) {
      // constrain to the slider height
      if (event->fY < (Int_t)fHeight/2-7 || event->fY > (Int_t)fHeight/2+7) {
         return kTRUE;
      }
      fPressPoint = event->fX;
      fPressSmin  = fSmin;
      fPressSmax  = fSmax;
 
      int relMin = (int)((fWidth-16) * (fSmin - fVmin) / (fVmax - fVmin)) + 1;
      int relMax = (int)((fWidth-16) * (fSmax - fVmin) / (fVmax - fVmin) + 15);
      if (fPressPoint < (relMax - relMin) / 4 + relMin)
         // move only min value
         fMove = 1;
      else if (fPressPoint > (relMax - relMin) / 4 * 3 + relMin)
         // move only max value
         fMove = 2;
      else
         // move min and max value
         fMove = 3;
 
      SendMessage(fMsgWindow, MK_MSG(kC_HSLIDER, kSL_PRESS), fWidgetId, 0);
      fClient->ProcessLine(fCommand, MK_MSG(kC_HSLIDER, kSL_PRESS), fWidgetId, 0);
      Pressed();
 
      // last argument kFALSE forces all specified events to this window
      gVirtualX->GrabPointer(fId, kButtonPressMask | kButtonReleaseMask |
                             kPointerMotionMask, kNone, kNone,
                             kTRUE, kFALSE);
   } else if (event->fType == kButtonRelease && event->fCode == kButton1) {
      SendMessage(fMsgWindow, MK_MSG(kC_HSLIDER, kSL_RELEASE), fWidgetId, 0);
      fClient->ProcessLine(fCommand, MK_MSG(kC_HSLIDER, kSL_RELEASE), fWidgetId, 0);
      Released();
      fMove = 0;
 
      gVirtualX->GrabPointer(0, 0, 0, 0, kFALSE);  // ungrab pointer
   } else
      fMove = 0;
 
   return kTRUE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Handle mouse motion event in horizontal slide widget.
 
Bool_t TGDoubleHSlider::HandleMotion(Event_t *event)
{
   ChangeCursor(event);
   if (fMove == 0) return kTRUE;
 
   static Long64_t was = gSystem->Now();
   Long64_t now = gSystem->Now();
 
   if ((now-was) < 50) return kTRUE;
   was = now;
 
   int     diff;
   Double_t oldMin, oldMax;
 
   diff    = event->fX - fPressPoint;
   oldMin  = fSmin;
   oldMax  = fSmax;
 
   if (fMove == 1) {
      // change of min value
      fSmin = fPressSmin + diff * (fVmax - fVmin) / (fWidth-16);
      if (fSmin < fVmin) fSmin = fVmin;
      if (fSmin > fSmax) fSmin = fSmax;
   } else if (fMove == 2) {
      // change of max value
      fSmax = fPressSmax + diff * (fVmax - fVmin) / (fWidth-16);
      if (fSmax > fVmax) fSmax = fVmax;
      if (fSmax < fSmin) fSmax = fSmin;
   } else if (fMove == 3) {
      // change of min and of max value
      Double_t logicalDiff;
      logicalDiff = diff * (fVmax - fVmin) / (fWidth-16);
      if (fPressSmax + logicalDiff > fVmax)
         logicalDiff = fVmax - fPressSmax;
      if (fPressSmin + logicalDiff < fVmin)
         logicalDiff = fVmin - fPressSmin;
      fSmax = fPressSmax + logicalDiff;
      fSmin = fPressSmin + logicalDiff;
   }
 
   // check if position has changed
   if (fMove != 0 && (fSmax != oldMax || fSmin != oldMin)) {
      fClient->NeedRedraw(this);
      SendMessage(fMsgWindow, MK_MSG(kC_HSLIDER, kSL_POS), fWidgetId, 0);
      fClient->ProcessLine(fCommand, MK_MSG(kC_HSLIDER, kSL_POS), fWidgetId, 0);
      PositionChanged();
   }
   return kTRUE;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Save an horizontal slider as a C++ statement(s) on output stream out.
 
void TGDoubleHSlider::SavePrimitive(std::ostream &out, Option_t *option /*= ""*/)
{
   SaveUserColor(out, option);
 
   out << "   TGDoubleHSlider *" << GetName() << " = new TGDoubleHSlider(" << fParent->GetName() << "," << GetWidth()
       << ", " << GetSString() << ", " << WidgetId() << ", " << GetOptionString() << ", ucolor";
   if (fMarkEnds) {
      if (fReversedScale)
         out << ", kTRUE, kTRUE);\n";
      else
         out << ", kFALSE, kTRUE);\n";
   } else if (fReversedScale) {
      out << ", kTRUE);\n";
   } else {
      out << ");\n";
   }
   if (option && strstr(option, "keep_names"))
      out << "   " << GetName() << "->SetName(\"" << GetName() << "\");\n";
 
   if (fVmin != 0 || fVmax != (Int_t)fWidth)
      out << "   " << GetName() << "->SetRange(" << fVmin << "," << fVmax << ");\n";
 
   if (fSmin != fWidth / 8 * 3 || fSmax != fWidth / 8 * 5)
      out << "   " << GetName() << "->SetPosition(" << GetMinPosition() << "," << GetMaxPosition() << ");\n";
 
   if (fScale != 10)
      out << "   " << GetName() << "->SetScale(" << fScale << ");\n";
}
 
////////////////////////////////////////////////////////////////////////////////
/// Save an horizontal slider as a C++ statement(s) on output stream out.
 
void TGDoubleVSlider::SavePrimitive(std::ostream &out, Option_t *option /*= ""*/)
{
   SaveUserColor(out, option);
 
   out << "   TGDoubleVSlider *" << GetName() << " = new TGDoubleVSlider(" << fParent->GetName() << "," << GetHeight()
       << "," << GetSString() << "," << WidgetId() << "," << GetOptionString() << ", ucolor";
   if (fMarkEnds) {
      if (fReversedScale)
         out << ",kTRUE,kTRUE);\n";
      else
         out << ",kFALSE,kTRUE);\n";
   } else if (fReversedScale) {
      out << ",kTRUE);\n";
   } else {
      out << ");\n";
   }
   if (option && strstr(option, "keep_names"))
      out << "   " << GetName() << "->SetName(\"" << GetName() << "\");\n";
 
   if (fVmin != 0 || fVmax != (Int_t)fHeight)
      out << "   " << GetName() << "->SetRange(" << fVmin << "," << fVmax << ");\n";
 
   if (fSmin != fHeight / 8 * 3 || fSmax != fHeight / 8 * 5)
      out << "   " << GetName() << "->SetPosition(" << GetMinPosition() << "," << GetMaxPosition() << ");\n";
 
   if (fScale != 10)
      out << "   " << GetName() << "->SetScale(" << fScale << ");\n";
}