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Re: Set indent based on instrument name (issue 6457049)

From: Phil Holmes
Subject: Re: Set indent based on instrument name (issue 6457049)
Date: Mon, 30 Jul 2012 22:14:37 +0100

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Sent: Monday, July 30, 2012 6:54 PM
Subject: Re: Set indent based on instrument name (issue 6457049)

Little nitpicks based on my C++ experience in other projects, with no
knowledge whatsoever of lilypond internals.
File lily/ (right):
Instrument_name_engraver::Get_text_len_from_name (SCM scheme_text)
convention is to use lower-case names for class functions (or methods if
you prefer)
File lily/ (right):
lily/ Real long_name_len = 0.0;
could these be class member variables instead of global variables?

I don't believe so. I'd be happy to be corrected by someone who understands this better than I do, but my understanding of c++ (which I guess at based on c#) says that, in order to access a class member variable, you need to have an instantiation of the class. The problem we have is that the knowledge of the instrument name strings is in a different class (Instrument_name_engraver). We need to persist the value of the longest instrument name, and pass it to output-def, where the indents are set. If we instantiated an output-def class in Instrument_name_engraver, we would lose the instantiation when Instrument_name_engraver dies, so the values would not be persisted. Hence why I ended up with global variables. The one thing I thought about on the way home tonight is that these need to be zeroed when we create a new Score, so I need to find out/be told how to do that.

... hmm, more generally, I'm not sold on the whole set_inst_name_len
approach.  Is there any way you could just pass an additional argument
to line_dimenstions_int , and determine the data you need from that

Not AFAICS. It currently requires 2 arguments: Output_def *def, int n, and there's no way we can satisfy them from Instrument_name_engraver. I think adding an extra function to access the global variables is an effective encapsulation of the variable, and works for me.

Phil Holmes

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