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This makes it possible to choose the traversal order; either depth first or breadth first and when visiting actors in a depth first order there is now a callback called before children are traversed and one called after. Some tasks such as unrealizing actors need to explicitly control the traversal order to maintain the invariable that all children of an actor are unrealized before we actually mark the parent as unrealized. The callbacks are now passed the relative depth in the graph of the actor being visited and instead of only being able to return a boolean to bail out of further traversal it can now do one of: continue, skip_children or break. To implement something like unrealize it's desirable to skip children that you find have already been unrealized.
165 lines
6.9 KiB
C
165 lines
6.9 KiB
C
/*
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* Clutter.
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*
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* An OpenGL based 'interactive canvas' library.
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*
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* Copyright (C) 2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __CLUTTER_ACTOR_PRIVATE_H__
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#define __CLUTTER_ACTOR_PRIVATE_H__
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#include <clutter/clutter-actor.h>
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G_BEGIN_DECLS
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/*
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* ClutterRedrawFlags:
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* @CLUTTER_REDRAW_CLIPPED_TO_ALLOCATION: Tells clutter the maximum
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* extents of what needs to be redrawn lies within the actors
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* current allocation. (Only use this for 2D actors though because
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* any actor with depth may be projected outside of its allocation)
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*
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* Flags passed to the clutter_actor_queue_redraw_with_clip ()
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* function
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*
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* Since: 1.6
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*/
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typedef enum
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{
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CLUTTER_REDRAW_CLIPPED_TO_ALLOCATION = 1 << 0
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} ClutterRedrawFlags;
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/* ClutterActorTraverseFlags:
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* CLUTTER_ACTOR_TRAVERSE_DEPTH_FIRST: Traverse the graph in
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* a depth first order.
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* CLUTTER_ACTOR_TRAVERSE_BREADTH_FIRST: Traverse the graph in a
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* breadth first order.
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*
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* Controls some options for how clutter_actor_traverse() iterates
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* through the graph.
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*/
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typedef enum _ClutterActorTraverseFlags
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{
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CLUTTER_ACTOR_TRAVERSE_DEPTH_FIRST = 1L<<0,
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CLUTTER_ACTOR_TRAVERSE_BREADTH_FIRST = 1L<<1
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} ClutterActorTraverseFlags;
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/**
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* ClutterActorTraverseVisitFlags:
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* CLUTTER_ACTOR_TRAVERSE_VISIT_CONTINUE: Continue traversing as
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* normal
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* CLUTTER_ACTOR_TRAVERSE_VISIT_SKIP_CHILDREN: Don't traverse the
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* children of the last visited actor. (Not applicable when using
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* CLUTTER_ACTOR_TRAVERSE_DEPTH_FIRST_POST_ORDER since the children
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* are visited before having an opportunity to bail out)
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* CLUTTER_ACTOR_TRAVERSE_VISIT_BREAK: Immediately bail out without
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* visiting any more actors.
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*
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* Each time an actor is visited during a scenegraph traversal the
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* ClutterTraverseCallback can return a set of flags that may affect
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* the continuing traversal. It may stop traversal completely, just
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* skip over children for the current actor or continue as normal.
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*/
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typedef enum _ClutterActorTraverseVisitFlags
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{
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CLUTTER_ACTOR_TRAVERSE_VISIT_CONTINUE = 1L<<0,
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CLUTTER_ACTOR_TRAVERSE_VISIT_SKIP_CHILDREN = 1L<<1,
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CLUTTER_ACTOR_TRAVERSE_VISIT_BREAK = 1L<<2
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} ClutterActorTraverseVisitFlags;
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/**
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* ClutterTraverseCallback:
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*
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* The callback prototype used with clutter_actor_traverse. The
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* returned flags can be used to affect the continuing traversal
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* either by continuing as normal, skipping over children of an
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* actor or bailing out completely.
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*/
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typedef ClutterActorTraverseVisitFlags (*ClutterTraverseCallback) (ClutterActor *actor,
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int depth,
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void *user_data);
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/* ClutterForeachCallback:
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* @actor: The actor being iterated
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* @user_data: The private data specified when starting the iteration
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*
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* A generic callback for iterating over actor, such as with
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* _clutter_actor_foreach_child. The difference when compared to
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* #ClutterCallback is that it returns a boolean so it is possible to break
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* out of an iteration early.
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*
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* Return value: %TRUE to continue iterating or %FALSE to break iteration
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* early.
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*/
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typedef gboolean (*ClutterForeachCallback) (ClutterActor *actor,
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void *user_data);
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gint _clutter_actor_get_n_children (ClutterActor *self);
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gboolean _clutter_actor_foreach_child (ClutterActor *self,
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ClutterForeachCallback callback,
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void *user_data);
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void _clutter_actor_traverse (ClutterActor *actor,
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ClutterActorTraverseFlags flags,
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ClutterTraverseCallback before_children_callback,
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ClutterTraverseCallback after_children_callback,
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void *user_data);
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ClutterActor *_clutter_actor_get_stage_internal (ClutterActor *actor);
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void _clutter_actor_apply_modelview_transform (ClutterActor *self,
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CoglMatrix *matrix);
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void _clutter_actor_apply_modelview_transform_recursive (ClutterActor *self,
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ClutterActor *ancestor,
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CoglMatrix *matrix);
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void _clutter_actor_rerealize (ClutterActor *self,
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ClutterCallback callback,
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void *data);
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void _clutter_actor_set_opacity_parent (ClutterActor *self,
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ClutterActor *parent);
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void _clutter_actor_set_enable_model_view_transform (ClutterActor *self,
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gboolean enable);
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void _clutter_actor_set_enable_paint_unmapped (ClutterActor *self,
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gboolean enable);
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void _clutter_actor_set_has_pointer (ClutterActor *self,
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gboolean has_pointer);
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void _clutter_actor_queue_redraw_with_clip (ClutterActor *self,
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ClutterRedrawFlags flags,
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ClutterPaintVolume *clip_volume);
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const ClutterPaintVolume *_clutter_actor_get_queue_redraw_clip (ClutterActor *self);
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void _clutter_actor_set_queue_redraw_clip (ClutterActor *self,
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const ClutterPaintVolume *clip_volume);
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void _clutter_actor_finish_queue_redraw (ClutterActor *self,
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ClutterPaintVolume *clip);
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gboolean _clutter_actor_set_default_paint_volume (ClutterActor *self,
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GType check_gtype,
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ClutterPaintVolume *volume);
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G_CONST_RETURN gchar *_clutter_actor_get_debug_name (ClutterActor *self);
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void _clutter_actor_push_clone_paint (void);
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void _clutter_actor_pop_clone_paint (void);
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G_END_DECLS
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#endif /* __CLUTTER_ACTOR_PRIVATE_H__ */
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