Re: GUI interface style query
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- Subject: Re: GUI interface style query
- From: David Given <dg@...>
- Date: 2004年10月29日 15:43:18 +0100
On Friday 29 October 2004 13:32, Mike Pall wrote:
[...]
> I suggest to provide both an iterator and a return-all-children-on-stack
> function for convenience.
The problem with iterators is that I have problems if the user starts
rearranging the hierarchy. The only safe thing to do is to take a snapshot of
the children and return that.
It does occur to me, however, that I don't need to implement everything in C.
This would probably work as an iterator:
function childrenof(object)
local c = {object:getchildren()}
local n = table.getn(c)
local i = 1
return function()
if (i < n) then
local o = c[i]
i = i + 1
return o
end
return nil
end
end
Actually, this is probably better!
function childrenof(object)
return ipairs({object:getchildren()})
end
Adding Lua-based functions to a C-based metatable is a bit unpleasant, but
perfectly possible.
BTW, I've noticed that this works:
for i, j in table do
print(i, "=", j)
end
It seems to do the same thing as pairs(table). Is this intended?
--
+- David Given --McQ-+ "There are two major products that come out of
| dg@cowlark.com | Berkeley: LSD and Unix. We don't believe this to be
| (dg@tao-group.com) | a coincidence." --- Jeremy S. Anderson
+- www.cowlark.com --+