wheelmouse.cc File Reference

#include <X11/Intrinsic.h>
#include <X11/Xlib.h>
#include <Xm/Xm.h>
#include <Xm/ScrollBar.h>

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Functions
static void	mouseScroll (Widget, XtPointer client_data, XEvent *event)
void	xmAddMouseEventHandler (Widget w)

Function Documentation

static void mouseScroll ( Widget  , XtPointer  client_data, XEvent *  event  )

static

Definition at line 57 of file wheelmouse.cc.

{
   Widget sb = (Widget)client_data;
   int value_return           = 0;
   int slider_size_return     = 0;
   int increment_return       = 0;
   int page_increment_return = 0;
    int count;
   int step;

   /* get a few value regarding the scrollbar conf. */
   XmScrollBarGetValues (sb, &value_return, &slider_size_return,
                        &increment_return, &page_increment_return);

   /* calculate the step wide according to the pressed keys */
   if ( event->xbutton.state & ShiftMask )
    {
       step = 1;
    }
    else if ( event->xbutton.state & ControlMask )
    {
       step = page_increment_return;
    }
    else
    {
       step = page_increment_return >> 1;
    }
   
   if ( event->xbutton.button == Button4 )
    {
        value_return -= step;
       if ( value_return < 0 )
           value_return = 0;
    }
    else if ( event->xbutton.button == Button5 )
    {
      /* and the max value for increment */
      XtVaGetValues(sb, XmNmaximum, &count, NULL);
        value_return += step;
        if ( value_return > count - slider_size_return )
           value_return = count - slider_size_return;
    }

   /* finally perform scrolling with the calculated step */
   if ( event->xbutton.button == Button4 ||
         event->xbutton.button == Button5    )
    {
      XmScrollBarSetValues (sb, value_return, slider_size_return,
                        increment_return, page_increment_return, True);
   }
}

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void xmAddMouseEventHandler

(

Widget

w

)

Definition at line 125 of file wheelmouse.cc.

{
   Widget wid;

   /* we need to pass the scrollbar widget to the handler */    
   XtVaGetValues(XtParent(w),XmNverticalScrollBar, &wid, NULL);

   /* handler for the scrolledList/ScrolledText */
   XtAddEventHandler(w, ButtonReleaseMask, False,
                     (XtEventHandler) mouseScroll, wid);
    /* and for the scrollbar itself */    
    XtAddEventHandler(wid, ButtonReleaseMask, False,
                          (XtEventHandler) mouseScroll, wid);
} 

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