datagrid problem resolved

[Trevor DeVore]

On Aug 16, 2009, at 5:09 AM, Yves COPPE wrote:

> if you have a fld in a datagrid ( Form style) and this fld (let us  
> name him : "body") contains from row to row a variable text,
> you will use a layout script in the following form :
>   put item 2 of theRect + the formattedHeight of field "Body" of me  
> into item 4 of theRect
>
> It gives problems. if you want to avoid problems, you have to put a  
> height to your fld "body" which is high enough so that the  
> "formattedheight" can return a good value
>
>   put item 2 of theRect + 50 into item 4 of theRect  -- "50" is  
> arbitrary
>   -- then set the rect
>   set the rect of fld "Body" of me to theRect
>   -- now get the correct value of the Formattedheight
>  put item 2 of theRect + the formattedHeight of field "Body" of me  
> into item 4 of theRect
>  set the rect of fld "Body" of me to theRect

To sum up, Yves had a field in his data grid template whose height was  
adjusted to fit the text contents. His original code was setting the  
rect of the field in one pass. The problem with setting the rect in  
one pass when the field is being resized to fit the text height is  
that the width of the field before setting the rect might not be the  
width of the field after setting the rect. This means the  
formattedHeight value might not be incorrect.

The proper way to have a field that adjusts height according to  
content is:

on LayoutControl pControlRect
     ## ...

     ## First adjust width
     put the rect of field "MyAdjustableHeightField" of me into theRect
     put item 3 of pControlRect into item 3 of theRect ## adjust field  
to new width
     set the rect of field "MyAdjustableHeightField" of me to theRect

     ## Now adjust height
     put item 2 of theRect + the formattedHeight of field  
"MyAdjustableHeightField" of me \
         into item 4 of theRect
     set the rect of field "MyAdjustableHeightField" of me to theRect

     ## ...
end LayoutControl

-- 
Trevor DeVore
Blue Mango Learning Systems
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