[reportlab-users] KeepTogether limit

[Robin Becker]

David S. wrote:

> Is there a way to have KeepTogether NOT keep together when a flowable is bigger

> than some size?  I tried to use maxHeight but without success.

> 

> Thanks,

> David S.

....... I don't think it has right now, but the logic in there is perhaps not 
particularly simple.

Basically the contents should be wrapped only once, then when we come to draw 
the contents we either have enough space or are asked to split. In the split 
method we always return the contents list possibly modified.

C0 = self._H>aH and (not self._maxHeight or aH>self._maxHeight)
    ie content height >available height and the maxHeight isn't binding


C1 = self._H0>aH
      ie the initial bit of contents is too large

if C0 then we attempt to move to the next frame before doing the rest of the 
layout. Otherwise if C1 is true we insert an extra empty flowable in the list to 
allow the large item to be re-split next time around. In all other cases the 
contents list is returned as is. The C0 condition is probably a bit fake, but 
it's not to do with switching off the keepTogether behaviour. To do that we'd 
need to do something like

if self._H>x:
    C1 = True
    C0 = False

we need C1 = True so the outer algorithm can think it's making some progress (we 
insert a Null flowable into the stream).
-- 
Robin Becker