Extracting a reference to a stack

Peter Haworth pete at lcsql.com
Sat Aug 8 19:51:54 CEST 2015


Whoops, hit send too soon, should be:

function stackOfObject pobject

   repeat
      if word 1 of pobject is "stack" then
         return pobject
     else
      put the long owner of pobject into pobject
   end repeat

end stackOfObject

On Sat, Aug 8, 2015 at 10:45 AM Peter Haworth <pete at lcsql.com> wrote:

> I do it like this
>
> function stackOfObject pobject
>
> local tObject
>
> put pobject into tObject
> repeat
>    if word 1 of tObject is "stack" then
>       return tObject
> end if
>
> On Sat, Aug 8, 2015 at 10:31 AM Peter M. Brigham <pmbrig at gmail.com> wrote:
>
>> OK, Here's a revision:
>>
>> function ownerStack pObjLongID
>>    -- returns the name of the stack immediately containing pObjLongID
>>    -- by Peter M. Brigham, pmbrig at gmail.com — freeware
>>    -- tags: control
>>    -- requires getprop robustName
>>
>>    replace " of " with cr in pObjLongID
>>    put lineoffset(cr & "stack ",cr & pObjLongID) into stLine
>>    put line stLine to -1 of pObjLongID into stName
>>    replace cr with " of " in stName
>>    return stName
>> end ownerStack
>>
>> -- Peter
>>
>> Peter M. Brigham
>> pmbrig at gmail.com
>> http://home.comcast.net/~pmbrig
>>
>>
>> On Aug 8, 2015, at 10:45 AM, David Bovill wrote:
>>
>> > There was a recent feature added to the language that would help -
>> maybe it
>> > was something to do with the owner....
>> >
>> > I have a similarly convoluted function and getprop - one of the issues
>> is
>> > that if you want the long name of the stack the control is part of -
>> this
>> > could be a mainstack or a substack - so to get "the stack on which the
>> > control is placed" has always been a bit of a pain...
>> >
>> > On 8 August 2015 at 15:16, Peter M. Brigham <pmbrig at gmail.com> wrote:
>> >
>> >> Here's a quick solution:
>> >>
>> >> function ownerStack pObjLongID
>> >>   replace " of " with numtochar(8) in pObjLongID
>> >>   set the itemdel to numtochar(8)
>> >>   return item -1 of pObjLongID
>> >> end ownerStack
>> >>
>> >> A more general solution is what I use in my library. The getItem()
>> >> function is so useful that I use it *everywhere*.
>> >>
>> >> function ownerStack pObjLongID
>> >>   -- returns the name of the stack containing pObjLongID
>> >>   -- by Peter M. Brigham, pmbrig at gmail.com — freeware
>> >>   -- requires getItem(), getDelimiters()
>> >>
>> >>   put getItem(pObjLongID,-1," of ") into tStack
>> >>   put the name of tStack into stackName
>> >>   return stackName
>> >> end ownerStack
>> >>
>> >> function getItem pContainer, pIndex, pDelim
>> >>   -- returns item # pIndex of pContainer, given itemdelimiter = pDelim
>> >>   -- could just "get item pIndex of pContainer" in the calling handler
>> but
>> >>   --    then have to set and restore the itemDelimiter, so this is less
>> >> hassle
>> >>   -- for instance, the following returns the filename from the
>> filepath:
>> >>   --    put getItem(tPath,-1,"/") into tFileName
>> >>   -- defaults to pDelim = tab
>> >>   -- allows pIndex to be a range, eg "3-5"
>> >>   --    in that case enclose the range in quotes
>> >>   -- also allows pDelim to be a string of characters
>> >>   --    so you could do this:
>> >>   --       getItem("a//b//c//d//e//f",4,"//") -> d
>> >>   --    or:
>> >>   --       getItem("a or b or c or d or e or f","3-5"," or ") -> c or d
>> >> or e
>> >>   --    which expands the possibilities for use enormously
>> >>   -- by Peter M. Brigham, pmbrig at gmail.com — freeware
>> >>   -- requires getDelimiters()
>> >>
>> >>   -- first, if pDelim is a string then get a delimiter that is not
>> found
>> >>   --    in pContainer and use it in place of pDelim
>> >>   if pDelim = empty then put tab into pDelim
>> >>   if len(pDelim) > 1 then
>> >>      put getDelimiters(pContainer) into tempDel
>> >>      if tempDel begins with "Error" then
>> >>         return "Error in getDelimiters()"
>> >>      end if
>> >>      replace pDelim with tempDel in pContainer
>> >>   else
>> >>      put pDelim into tempDel
>> >>   end if
>> >>
>> >>   -- now parse pIndex to take care of ranges and negative values
>> >>   --    and get the item(s) requested
>> >>   put offset("-",pIndex) into dashPos
>> >>   set the itemdelimiter to tempDel
>> >>   if dashPos > 1 then
>> >>      -- don't catch if pIndex is something like -1, -2, etc
>> >>      put char 1 to dashPos-1 of pIndex into tStart
>> >>      put char dashPos+1 to -1 of pIndex into tEnd
>> >>      put item tStart to tEnd of pContainer into theItem
>> >>      replace tempDel with pDelim in theItem
>> >>   else
>> >>      put item pIndex of pContainer into theItem
>> >>   end if
>> >>   return theItem
>> >> end getItem
>> >>
>> >> function getDelimiters pText, nbr
>> >>   -- returns a cr-delimited list of <nbr> characters
>> >>   --    not found in the variable pText
>> >>   -- use for delimiters for, eg, parsing text files, manipulating
>> arrays,
>> >> etc.
>> >>   -- usage: put getDelimiters(pText,2) into tDelims
>> >>   --        if tDelims begins with "Error" then exit to top -- or
>> whatever
>> >>   --        put line 1 of tDelims into lineDivider
>> >>   --        put line 2 of tDelims into itemDivider
>> >>   --             etc.
>> >>   -- by Peter M. Brigham, pmbrig at gmail.com — freeware
>> >>
>> >>   if pText = empty then return "Error: no text specified."
>> >>   if nbr = empty then put 1 into nbr -- default 1 delimiter
>> >>   put "2,3,4,5,6,7,8,16,17,18,19,20,21,22,23,24,25,26" into baseList
>> >>   -- low ASCII values, excluding CR, LF, tab, etc.
>> >>   put the number of items of baseList into maxNbr
>> >>   if nbr > maxNbr then return "Error: max" && maxNbr && "delimiters."
>> >>   repeat with tCount = 1 to nbr
>> >>      put true into failed
>> >>      repeat with i = 1 to the number of items of baseList
>> >>         put item i of baseList into testNbr
>> >>         put numtochar(testNbr) into testChar
>> >>         if testChar is not in pText then
>> >>            -- found one, store and get next delim
>> >>            put false into failed
>> >>            put testChar into line tCount of delimList
>> >>            exit repeat
>> >>         end if
>> >>      end repeat
>> >>      if failed then
>> >>         if tCount = 0 then
>> >>            return "Error: cannot get any delimiters."
>> >>         else if tCount = 1 then
>> >>            return "Error: can only get one delimiter."
>> >>         else
>> >>            return "Error: can only get" && tCount && "delimiters."
>> >>         end if
>> >>      end if
>> >>      delete item i of baseList
>> >>   end repeat
>> >>   return delimList
>> >> end getDelimiters
>> >>
>> >>
>> >> On Aug 8, 2015, at 8:23 AM, David Bovill wrote:
>> >>
>> >>> Given the long id of a control - how do I extract the reference to the
>> >>> stack ti belongs to? I have a function that i have used since the
>> dawn of
>> >>> time for this - but I recall seeing a new chunk / target / reference
>> >>> feature of Livecode in the last year that makes this easier. Did I
>> >> imagine
>> >>> it?
>> >>> _______________________________________________
>> >>> use-livecode mailing list
>> >>> use-livecode at lists.runrev.com
>> >>> Please visit this url to subscribe, unsubscribe and manage your
>> >> subscription preferences:
>> >>> http://lists.runrev.com/mailman/listinfo/use-livecode
>> >>
>> >>
>> >> _______________________________________________
>> >> use-livecode mailing list
>> >> use-livecode at lists.runrev.com
>> >> Please visit this url to subscribe, unsubscribe and manage your
>> >> subscription preferences:
>> >> http://lists.runrev.com/mailman/listinfo/use-livecode
>> >>
>> > _______________________________________________
>> > use-livecode mailing list
>> > use-livecode at lists.runrev.com
>> > Please visit this url to subscribe, unsubscribe and manage your
>> subscription preferences:
>> > http://lists.runrev.com/mailman/listinfo/use-livecode
>>
>>
>> _______________________________________________
>> use-livecode mailing list
>> use-livecode at lists.runrev.com
>> Please visit this url to subscribe, unsubscribe and manage your
>> subscription preferences:
>> http://lists.runrev.com/mailman/listinfo/use-livecode
>>
>


More information about the use-livecode mailing list