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actor: Add ClutterActorIter

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Iterating over children and ancestors of an actor is a relatively common
operation. Currently, you only have one option: start a for() loop, get
the first child of the actor, and advance to the next sibling for the
list of children; or start a for() loop and advance to the parent of the
actor.

These operations can be easily done through the ClutterActor API, but
they all require going through the public API, and performing multiple
type checks on the arguments.

Along with the DOM API, it would be nice to have an ancillary, utility
API that uses an iterator structure to hold the state, and can be
advanced in a loop.

https://bugzilla.gnome.org/show_bug.cgi?id=668669
This commit is contained in:
Emmanuele Bassi
2012-01-25 15:27:57 +00:00
parent fa856e3f5e
commit 58ffcfb10e
8 changed files with 385 additions and 13 deletions
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13
clutter/clutter-types.h
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@ -48,6 +48,18 @@ G_BEGIN_DECLS
#define CLUTTER_DEPRECATED_FOR(f) G_DEPRECATED_FOR(f)
#endif
/* some structures are meant to be opaque and still be allocated on the stack;
* in order to avoid people poking at their internals, we use this macro to
* ensure that users don't accidentally access a struct private members.
*
* we use the CLUTTER_COMPILATION define to allow us easier access, though.
*/
#ifdef CLUTTER_COMPILATION
#define CLUTTER_PRIVATE_FIELD(x) x
#else
#define CLUTTER_PRIVATE_FIELD(x) clutter_private_ ## x
#endif
#define CLUTTER_TYPE_ACTOR_BOX (clutter_actor_box_get_type ())
#define CLUTTER_TYPE_FOG (clutter_fog_get_type ())
#define CLUTTER_TYPE_GEOMETRY (clutter_geometry_get_type ())
@ -65,6 +77,7 @@ typedef struct _ClutterChildMeta ClutterChildMeta;
typedef struct _ClutterLayoutMeta ClutterLayoutMeta;
typedef struct _ClutterActorMeta ClutterActorMeta;
typedef struct _ClutterLayoutManager ClutterLayoutManager;
typedef struct _ClutterActorIter ClutterActorIter;
typedef struct _ClutterAlpha ClutterAlpha;
typedef struct _ClutterAnimatable ClutterAnimatable; /* dummy */