Merge remote-tracking branch 'origin/translation'

[lilypond.git] / Documentation / extending / programming-interface.itely

diff --git a/Documentation/extending/programming-interface.itely b/Documentation/extending/programming-interface.itely
index 6b16fdafbc64bb34bb4bfa580ebdfe5b98561f48..3494a5fdd1fff9747d7b6cea26772bb5b7c66937 100644 (file)
--- a/Documentation/extending/programming-interface.itely
+++ b/Documentation/extending/programming-interface.itely
@@ -8,7 +8,7 @@
     Guide, node Updating translation committishes..
 @end ignore
 
-@c \version "2.17.6"
+@c \version "2.19.2"
 
 @node Interfaces for programmers
 @chapter Interfaces for programmers
@@ -25,7 +25,6 @@ not familiar with Scheme, you may wish to read our
 * Markup functions::
 * Contexts for programmers::
 * Callback functions::
-* Inline Scheme code::
 * Difficult tweaks::
 @end menu
 
@@ -1251,6 +1250,19 @@ Properties that typically use callbacks include
 
 The procedure always takes a single argument, being the grob.
 
+That procedure may access the usual value of the property, by first
+calling the function that is the usual callback for that property, which
+can by found in the Internals Reference or the file 'define-grobs.scm':
+
+@example
+\relative c'' @{
+  \override Flag #'X-offset = #(lambda (flag)
+    (let ((default (ly:flag::calc-x-offset flag)))
+      (* default 4.0)))
+  c4. d8 a4. g8
+@}
+@end example
+
 If routines with multiple arguments must be called, the current grob
 can be inserted with a grob closure.  Here is a setting from
 @code{AccidentalSuggestion},
@@ -1291,8 +1303,10 @@ my-callback = #(lambda (grob)
                  (grob-interpret-markup grob (markup "foo")))
 @end example
 
-@node Inline Scheme code
-@section Inline Scheme code
+@ignore
+
+@n ode Inline Scheme code
+@s ection Inline Scheme code
 
 TODO: after this section had been written, LilyPond has improved
 to the point that finding a @emph{simple} example where one would
@@ -1339,6 +1353,7 @@ font size is prepended to the property list with the
 written back with @code{set!}.  The last element of the
 @code{let} block is the return value, @code{m} itself.
 
+@end ignore
 
 
 @node Difficult tweaks
@@ -1403,7 +1418,7 @@ of the broken tie is repositioned.
   \override Tie.after-line-breaking =
   #my-callback
   c1 ~ \break
-  c2 ~ c
+  c2 ~ 2
 }
 @end lilypond