[reportlab-users] Querying left over space

[Mike Driscoll]

Robin Becker wrote:

> Mike Driscoll wrote:

>> Hi,

>>

>> Is there a way to query how much horizontal and vertical space is 

>> left on a page? And is there a way to know how much "space" a line of 

>> text in 10 point will take up? I am working with nested tables and it 

>> keeps splitting one of the nested over two pages whereas I need it to 

>> keep the nested table in one piece. I hope that makes sense.

>>

>> I am coding on a Windows XP machine with Python 2.5 and ReportLab 2.3.

>>

>> Thanks,

>>

>> Mike

> ......

> I assume that you're using platypus to do the layout; the document's 

> active template has an active frame that controls the layout. The 

> coding that's used to determine whether something can be added is in 

> the _add method of the Frame class. It looks something like this



I'm using the SimpleDocTemplate from platypus, if that's what you mean. 
Then I use the Table object to create some tables and nest them as 
needed. The code works fine except that it splits in the middle of 
tables sometimes. I need some kind of grouping function to keep the 
tables whole...


>

>     y = self._y

>     p = self._y1p

>     s = 0

>     aW = self._getAvailableWidth()

>     if not self._atTop:

>         s =flowable.getSpaceBefore()

>         if self._oASpace:

>             s = max(s-self._prevASpace,0)

>     h = y - p - s

>     if h>0:

>         w, h = flowable.wrap(aW, h)

>     else:

>         return 0

>     h += s

>     y -= h

>     if y < p-_FUZZ:

>         if not rl_config.allowTableBoundsErrors and ((h>self._aH or 

> w>aW) and not trySplit):

>             from reportlab.platypus.doctemplate import LayoutError

>             raise LayoutError("Flowable %s (%sx%s points) too large 

> for frame (%sx%s points)." % (

>             flowable.__class__, w,h, aW,self._aH))

>         return 0

>     else:

>         #DRAW THE FLOWABLE AT self._x, y

>

> if you ignore the space before stuff then effectively the vertical 

> space remaining is

>     activeFrame._y - activeFrame._y1p

>

> hope this helps.


Hmmm...not sure how to use this, but will try to figure it out. Do I 
create a frame object to grab that information from?

- Mike