AttachableScrollBar.cpp

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/**********************************************************************
 
  Audacity: A Digital Audio Editor
 
  AttachableScrollBar.cpp
 
  James Crook
 
  Audacity is free software.
  This file is licensed under the wxWidgets license, see License.txt
 
*****************************************************************//*******************************************************************/
 
 
#include "AttachableScrollBar.h"
 
#include <wx/wxprec.h>
#include "ViewInfo.h"
 
 
BEGIN_EVENT_TABLE(AttachableScrollBar, wxScrollBar)
   EVT_SCROLL(AttachableScrollBar::OnScroll)
END_EVENT_TABLE()
 
AttachableScrollBar::AttachableScrollBar(
   wxWindow* parent,
   wxWindowID id,
   const wxPoint& pos,
   const wxSize& size,
   long style) :
   wxScrollBar( parent, id, pos, size, style )
{
   mpViewInfo = NULL;
}
 
AttachableScrollBar::~AttachableScrollBar(void)
{
}
 
// Essentially a float to int conversion.
void AttachableScrollBar::SetScrollBarFromViewInfo()
{
   // FIXME: PRL Aug 2015: Screen Width in Viewinfo Not needed?
#if 0
   ViewInfo & mViewInfo = *mpViewInfo;
 
   mViewInfo.sbarTotal = (int) (mViewInfo.GetTotalWidth());
   mViewInfo.sbarScreen = (int) (mViewInfo.GetScreenWidth());
   mViewInfo.sbarH = (int) (mViewInfo.GetBeforeScreenWidth());
 
   SetScrollbar(mViewInfo.sbarH, mViewInfo.sbarScreen,
                        mViewInfo.sbarTotal, mViewInfo.sbarScreen, TRUE);
#endif
}
 
// Essentially an int to float conversion.
void AttachableScrollBar::SetViewInfoFromScrollBar()
{
   // FIXME: PRL Aug 2015: Screen Width in Viewinfo Not needed? 
#if 0
   ViewInfo & mViewInfo = *mpViewInfo;
 
   int hlast = mViewInfo.sbarH;
 
   mViewInfo.sbarH = GetThumbPosition();
 
   if (mViewInfo.sbarH != hlast)
     mViewInfo.SetBeforeScreenWidth(mViewInfo.sbarH);
#endif
}
 
// Used to associated a ViewInfo structure with a scrollbar.
void AttachableScrollBar::SetViewInfo( ViewInfo * view )
{
   mpViewInfo = view;
   SetScrollBarFromViewInfo();
}
 
void AttachableScrollBar::OnScroll(wxScrollEvent & event)
{
   if( mpViewInfo == NULL )
   {
      event.Skip();
      return;
   }
   SetViewInfoFromScrollBar();
   event.Skip(); // This is so that the parent control can refresh whatever it needs to...
}