Hi and small scroll wheel patch

[Robert van der Kamp]

Hi Lyxers!

Back on the list again (after aprox. 3 years).
Downloaded lyx 1.0.3. I can see you've been quite busy.
For the moment I don't have concrete developing plans with Lyx,
I'll just watch this list for a while...

Anyway, here's a small patch for BufferView.C, method
BufferView::WorkAreaButtonPress(), line 986, where buttons
4 and 5 (the scroll wheel) are handled. Added acceleration support:
the faster the wheel is turned, the faster the screen is scrolled.
Something I also added to Xemacs, works really nice.

I know it's not an official cvs patch, so I hope it gets accepted. I'll
move to the cvs convention when I get deeper involved in Lyx
coding.

Cheers,
Robert van der Kamp


 // I am not quite sure if this is the correct place to put this,
 // but it will not cause any harm.
 // Patch from Mark Huang ([EMAIL PROTECTED]) to make LyX recognise
 // button 4 and 5. This enables LyX use use the scrollwhell on
 // certain mice for something useful.
 // Added wheel acceleration detection code. (RvdK).

 static Time lastTime = 0;
 if (ev->xbutton.button == 4){
  ScrollUp(1);
  if ( ev->xbutton.time - lastTime < 200 ) {
   ScrollUp(1);
  }
  if ( ev->xbutton.time - lastTime < 50 ) {
   ScrollUp(1);
   ScrollUp(1);
   ScrollUp(1);
  }
  if ( ev->xbutton.time - lastTime < 40 ) {
   ScrollUp(1);
   ScrollUp(1);
   ScrollUp(1);
   ScrollUp(1);
  }
  lastTime = ev->xbutton.time;
  return 0;
 }

 if (ev->xbutton.button == 5){
  ScrollDown(1);
  if ( ev->xbutton.time - lastTime < 200 ) {
   ScrollDown(1);
  }
  if ( ev->xbutton.time - lastTime <  50 ) {
   ScrollDown(1);
   ScrollDown(1);
   ScrollDown(1);
  }
  if ( ev->xbutton.time - lastTime < 40 ) {
   ScrollDown(1);
   ScrollDown(1);
   ScrollDown(1);
   ScrollDown(1);
  }
  lastTime = ev->xbutton.time;
  return 0;
 }