![]() ![]() By default, it is generated automatically in a way Context IDs ¶Įvery context is known under a unique ID, accessible through theįunction ly:context-id. Thus, a TabStaff may be foundĪs a Staff parent to a TabVoice. Contexts having the name as alias are alsoĬonsidered by ly:context-find. TabStaff, to fit in the hierarchy of the more frequently used, Return the boolean false if no appropriate parent is found.Īliases are a way for the more rarely used context types, like Search and return a context with the given name (a symbol) aboveĬontext: its parent, or the parent of its parent, or … Every context but Global is contained in a parent. The context hierarchy ¶Ĭontext follow a hierarchical structure. The value before the last \override but the primary, globalĭefault value for the grob property in the context type. This means that afterĪ sequence of \override commands, \revert does not reinstate \temporary pops the stack before pushing. Note that for backwards compatibility reasons, \override without Without a value, pop the top of the stack. This is the equivalent of a \temporary \override. If value is given, push it as a default for grob.property inĬontext. (ly:context-pushpop-property context grob property ) Return an alist mapping property names (as symbols) to theirĭefaults for the grob (a symbol) in context. In Scheme, the following functions deal with grob property defaults: (ly:context-grob-definition context grob) Modify properties of a context is the \set command: Contexts ¶ Context properties ¶Ĭontexts contain properties. Spelled in CamelCase, and grob interface names in Like music types and music classes, respectively, grob types are In the Internals Reference, they are listed under Like music objects, grobs are grouped together in grob interfaces. The event-causeįunction traces back the cause of a grob in events. It is also the way point-and-click can traceīack the origin of a grob in the source file. Whenever possible, a grob has an event or another grob as its cause,Īvailable in its cause property. (ly:grob-property grob property ) (ly:grob-set-property! grob property value) Related to their properties follow the same conventions as The term grob is short for graphical object. Is an introduction to what you should know before writing an engraver. Grobs are covered more in-depth in the Backend programming section. They are based on music classes (also called eventĬlasses) rather than music types. They communicate through context properties.īy convention, iterator and engraver names are writtenĬapitalized_with_underscores. ![]() In contrast to iterators, it is possible to writeĮngravers have no properties, because they are generally not directly Stem_engraver, Beam_engraver, Staff_symbol_engraver, and Is an engraver for every single bit of notation: Note_heads_engraver, Overall, they constitute the main component of translation. They can create grobs, setĬontext properties, and process the grobs created by other engravers. Music expressions – those preferably ending in Music rather thanĮvent – and broadcast their contents as stream events or createĬhild iterators for nested container expressions.Įngravers react to stream events. Iterators are responsible for the timing. Ly:event-property and ly:event-set-property!. Music types ending in Event are slated to become stream events.Įvents are Probs, hence the functions related to event properties: This does not hold for music types that contain other Most music event types are turned into stream events when their timeĬomes. They have a differentĬlass in C and a different Scheme type predicate: ly:stream-event?. Stream events are derivatives of music events. Listed in the Internals Reference under Contexts. To a certain portion of the score, vertically. Translation happens through several kinds of objects.Ĭontexts are used to store data. During translation, graphical objectsĪre created and set up for the backend. Translation in LilyPond is the flow of making a graphical ![]()
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