Find Scroll position of a chunk within a line that is wrapped

[Michael Doub]

My wishful thinking hearing about a new lead got me over excited.  I 
still have not found a way to make it work without looking at every 
character and simulating the word wrap myself... yuck!

Consider we have the following in a field 1 and pretend the line breaks 
you see are really the soft wrap points of a single line 1, and we are 
trying to get the scroll point for where char 12 is the first visible 
line: (remember the soft wrap occurs on a whitespace characters)

1234 6789
123456 890
234

  * the formattedheight of line 1 of fld 1 get us the total height of
    the line

  * item 4 of the formattedrect of line 1 of fld 1 - item 2 of the
    formattedrect of line 1 of fld 1 also gives us the total height

  * item 4 of the formattedrect of char 1 to 12 of fld 1 - item 2 of the
    formattedrect of char 1 to 12 of fld 1 gives us the height from the
    top of the first soft line to the bottom of the second soft line.  
    Unfortunately we need the TOP of the second soft line.
  * if we use the trick of selecting the last line and then selecting
    the current line, vScroll - the height of the line will give is the
    height of the last soft line 123.   Close but no cigar.

Any other suggestions?

I would like to see a new feature where we provide a line number in a 
field and we get a list of start and end character of each soft line  
something like:  get linedetails of line 1 of fld 1 would return:

1,10
10,21
22,24 -- remember the soft wrap occurs on a whitespace character

the number of lines it would tell us the number of soft lines
the number of words in char 1 to 10 of fld 1 tells us the number of 
words in the first soft line.
the formattedrect of char 10 to 21 of fld 1 tells us the height of the 
second soft line.

This is the most flexible solution I could come up with.  Other solution 
welcome.  ;-)

Regards,
    Mike

On 11/18/14 2:38 PM, Michael Doub wrote:
> I think that you are correct!   That was the lead that I was missing.
>
> Thanks!
>   Mike
>
> On 11/18/14 2:04 PM, Scott Rossi wrote:
>> If I understand what you¹re asking, I believe you can use the
>> formattedRect for this.
>>
>> Regards,
>>
>> Scott Rossi
>> Creative Director
>> Tactile Media, UX/UI Design
>>
>>
>>
>>
>> On 11/18/14, 10:23 AM, "Michael Doub" <mikedoub at gmail.com> wrote:
>>
>>> A related question to positioning a line within a field, is positioning
>>> a chunk within a line that is wrapped.   I am stumped on this one 
>>> and it
>>> may need engine support.   I don't know how to figure out the scroll
>>> value of something in the middle of a wrapped line.   In the thread
>>> discussing scroll positioning within a wrapped field we see how to find
>>> the top.   I figured out how to get the bottom using James Hales
>>> approach. (code in the forum and MasterLibrary)
>>>
>>> Does anyone see a way to calculate the scroll position of a chunk 
>>> within
>>> a line that is wrapped?
>>>
>>> Regards
>>>    Mike
>>>
>>>
>>>
>>> On 11/18/14 1:01 PM, Richard Gaskin wrote:
>>>> Michael Doub wrote:
>>>>
>>>>> I don't think the solution works because of a bug in livecode where
>>>>> spacebefore and spaceafter are not taken into account.
>>>> Thanks - I wasn't aware of that bug, but was able to find it:
>>>> <http://quality.runrev.com/show_bug.cgi?id=11688>
>>>>
>>>> Hopefully it'll get addressed for 6.7.1 and 7.0.1, since it's needed
>>>> for a wide range of tasks relating to text metrics.
>>>>
>>>
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