| RE: [platform-swt-dev] Scrollbar doesn't allow negative values. |
Try a fixed offset of MAX_INTEGER/2. I don't know what range is supported by all platforms. It might be safer to use 32767 or somesuch if certain platforms are constrained to 16bit ranges. Jeff. > -----Original Message----- > From: platform-swt-dev-admin@xxxxxxxxxxx > [mailto:platform-swt-dev-admin@xxxxxxxxxxx] On Behalf Of Randy Hudson > Sent: May 6, 2002 10:47 PM > To: platform-swt-dev@xxxxxxxxxxx > Subject: RE: [platform-swt-dev] Scrollbar doesn't allow > negative values. > > > I cannot add a fixed offset because the region is NOT finite. > (Well, I > supose it's MIN_INTEGER). > The workaround would have to be to create a new offset every > time I update > the extent (and thus minimums) of the freeform area, and then > substract > this offset from the "selection" returned from the Scrollbar > during user > scrolls, so 0 becomes 0-offset. > > Also, I have to update all of the values on the scrollbar all > the time, > even if just the "minimum" is changing, since really the minimum can't > change, it's always 0. > > > > |---------+----------------------------------> > | | "Jeff Brown" | > | | <j9brown@math.uwaterloo| > | | .ca> | > | | Sent by: | > | | platform-swt-dev-admin@| > | | eclipse.org | > | | | > | | | > | | 05/06/2002 09:27 PM | > | | Please respond to | > | | platform-swt-dev | > | | | > |---------+----------------------------------> > > >------------------------------------------------------------- > -----------------------------------------------| > | > | > | To: <platform-swt-dev@xxxxxxxxxxx> > | > | cc: > | > | Subject: RE: [platform-swt-dev] Scrollbar doesn't > allow negative values. | > | > | > | > | > > >------------------------------------------------------------- > -----------------------------------------------| > > > > > ... I expect the answer to be of the form: "Platform XYZ does > not support > it > natively." > > Since you're planning on using a scrollbar, I assume the region to be > scrolled is of a finite size. Why not just add an offset? Think of > setMinimumValue() as a convenience method that unfortunately > does not apply > to your scenario. > > > -----Original Message----- > > From: platform-swt-dev-admin@xxxxxxxxxxx > > [mailto:platform-swt-dev-admin@xxxxxxxxxxx] On Behalf Of > Randy Hudson > > Sent: May 6, 2002 5:55 PM > > To: platform-swt-dev@xxxxxxxxxxx > > Subject: [platform-swt-dev] Scrollbar doesn't allow negative values. > > > > > > I am trying to create a "freeform" surface that potentially > > extends in all > > 4 directions. To do this, I need to do a > > scrollbar.setMinimumValue(int), > > where that int might be less than zero. > > > > Is there any reason Scrollbar doesn't allow its setMinimum to > > take a number > > less than 0? > > > > _______________________________________________ > > platform-swt-dev mailing list > > platform-swt-dev@xxxxxxxxxxx > > http://dev.eclipse.org/mailman/listinfo/platform-swt-dev > > > > > > > > #### winmail.dat has been removed from this note on May 06 > 2002 by Randy > Hudson > > > _______________________________________________ > platform-swt-dev mailing list > platform-swt-dev@xxxxxxxxxxx > http://dev.eclipse.org/mailman/listinfo/platform-swt-dev > >
<<attachment: winmail.dat>>