DCPRINT PREVIEW Scroll wheel sensivety

[jdsoft]

Hello,
How can i control the number of scroll lines using the scroll-wheel in a DCPRINT PREVIEW
I tried SCROLLFACTOR 2, but that does not seem to work.
Suggestions are welcome

[rdonnay]

Jack -

I may have to put a special handler in that code.
I haven't touched the dcprint system in years.
I'll see what I can do.

[jdsoft]

Hello Roger,

I already found where to handle this in _dcprc.prg, XbpPreview:vScroll()
Quite simple to fix.
I am also looking for suppressing every second event of the scroll that Windows seems to fire if the mousewheel is changed just one notch.

Can you please add this to the next version?

For simplicity i set the scroll range to 50, but this ofcourse should be a parameter in DCPRINT ON and DCPRINT OPTIONS.

Code: Select all

   LOCAL nScrollDepth := 50
   CASE nCommand == XBPSB_PREVPOS
      //
      // 08-10-2022  J. Duijf 
      // Smooth scrolling 
      //
      nScroll = ::vScroll:getData()
      If nScroll > 0
         If nScrollDepth > 0
            nScroll  -= nScrollDepth 
         Else 
            nScroll  -= ::vScroll:setScrollBoxSize()
         Endif 
         ::vScroll:setData( Max(nScroll, 0) )
         ::setOrigin( ::hScroll:getData(), ::vScroll:getData() )
      Else 
         //
         // Already on top,
         // Prevent flickering of the preview 
         //
      Endif 
   CASE nCommand == XBPSB_NEXTPOS
      //
      // 08-10-2022  J. Duijf 
      // Smooth scrolling 
      //
      If nScrollDepth > 0
         nScroll  := ::vScroll:getData() + nScrolDepth     
      Else 
         nScroll  := ::vScroll:GetData() + ::vScroll:setScrollBoxSize()
      Endif  
      If nScroll < ::vScroll:setRange()[2]
         //
         // Only if there is something to Scroll
         // 
         ::vScroll:setData( Min(nScroll, ::vScroll:setRange()[2]) )
         ::setOrigin( ::hScroll:getData(), ::vScroll:getData() )
      Else  
         //
         // No scroll possible 
         // Prevent flickering of the preview 
         //
      Endif