Good deal! I used a callback - patch to be sent in the not-too-distant future.
~Mike On 6/2/10 4:26 PM, "Han-Wen Nienhuys" <hanw...@gmail.com> wrote: > On Wed, Jun 2, 2010 at 8:28 AM, Mike Solomon <mike...@ufl.edu> wrote: >> I am toying around with a new spanner, and before it prints, I need to >> do some calculations on all of its broken_intos_. I can easily do these >> calculations in the print function by accessing the broken_into_ of >> spanner->original (), but then this calculation is done for each time print >> is called, which is N-1 times too many (where N is the length of >> broken_into_). The code works just fine, but it is overkill: is there a way >> to perform operations on a spanner and its broken_into_'s once before the >> print function is called? > > Use a property with an attached callback to either hold the > computation result. The callback/property infrastructure will make > sure it happens only once. What are you trying to calculate? You > can also have a look at some of the callbacks that attach to > 'positioning-done, see for example the vertical alignment spanners. > > Since LilyPond is single-threaded, nothing really happens in parallel. _______________________________________________ lilypond-devel mailing list lilypond-devel@gnu.org http://lists.gnu.org/mailman/listinfo/lilypond-devel
