Drag-scrolling a group

[Devin Asay]

On Jul 11, 2013, at 12:10 PM, Roger Eller wrote:

> Can it be done math-free?  If you nest a group inside the scrollable locked
> group, and set the nested group to a simple "grab me" in a mouseDown or
> mouseStillDown handler…

While I appreciate the math-free approach, ;) grab isn't the best tool here, because it lets you drag the group contents beyond the bounds you want to show. Setting the scroll values, on the other hand, prevents that problem.

BTW, in the meantime I discovered that lock screen fixes most of my problems:

on mouseMove pNewMouseH, pNewMouseV
    if sDragging then
        lock screen
        set the hScroll of me to the hScroll of me - (pNewMouseH -sMouseH)
        set the vScroll of me to the vScroll of me - (pNewMouseV - sMouseV)
        unlock screen
    end if
end mouseMove

I'm still interested in other people's solutions to this. I can't imagine I'm the only one who's ever tried this.

Devin

Devin Asay
Learn to code with LiveCode University
http://university.livecode.com