[reportlab-users] Querying left over space

[Robin Becker]

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

	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.
-- 
Robin Becker