constraint: Add BindConstraint
The BindConstraint object is a constraint that binds the current position of an actor on a given axis to the actor that has the constraint applied.
This commit is contained in:
Emmanuele Bassi
parent
29257af30c
commit
769e964424
@ -80,6 +80,7 @@ source_h = \
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$(srcdir)/clutter-behaviour-path.h \
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$(srcdir)/clutter-behaviour-rotate.h \
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$(srcdir)/clutter-behaviour-scale.h \
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$(srcdir)/clutter-bind-constraint.h \
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$(srcdir)/clutter-binding-pool.h \
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$(srcdir)/clutter-bin-layout.h \
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$(srcdir)/clutter-box.h \
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@ -158,6 +159,7 @@ source_c = \
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$(srcdir)/clutter-behaviour-rotate.c \
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$(srcdir)/clutter-behaviour-scale.c \
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$(srcdir)/clutter-bezier.c \
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$(srcdir)/clutter-bind-constraint.c \
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$(srcdir)/clutter-binding-pool.c \
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$(srcdir)/clutter-bin-layout.c \
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$(srcdir)/clutter-box.c \
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267
clutter/clutter-bind-constraint.c
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267
clutter/clutter-bind-constraint.c
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@ -0,0 +1,267 @@
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "clutter-bind-constraint.h"
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#include "clutter-constraint.h"
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#include "clutter-debug.h"
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#include "clutter-enum-types.h"
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#include "clutter-private.h"
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#define CLUTTER_BIND_CONSTRAINT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), CLUTTER_TYPE_BIND_CONSTRAINT, ClutterBindConstraintClass))
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#define CLUTTER_IS_BIND_CONSTRAINT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), CLUTTER_TYPE_BIND_CONSTRAINT))
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#define CLUTTER_BIND_CONSTRAINT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), CLUTTER_TYPE_BIND_CONSTRAINT, ClutterBindConstraintClass))
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typedef struct _ClutterBindConstraintClass ClutterBindConstraintClass;
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struct _ClutterBindConstraint
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{
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ClutterConstraint parent_instance;
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ClutterActor *source;
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ClutterBindAxis bind_axis;
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gfloat offset;
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};
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struct _ClutterBindConstraintClass
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{
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ClutterConstraintClass parent_class;
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};
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enum
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{
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PROP_0,
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PROP_SOURCE,
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PROP_BIND_AXIS,
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PROP_OFFSET
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};
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G_DEFINE_TYPE (ClutterBindConstraint,
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clutter_bind_constraint,
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CLUTTER_TYPE_CONSTRAINT);
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static void
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update_actor_position (ClutterBindConstraint *bind)
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{
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ClutterVertex source_position;
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ClutterActor *actor;
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if (!clutter_actor_meta_get_enabled (CLUTTER_ACTOR_META (bind)))
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return;
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actor = clutter_actor_meta_get_actor (CLUTTER_ACTOR_META (bind));
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if (actor == NULL)
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return;
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source_position.x = clutter_actor_get_x (bind->source);
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source_position.y = clutter_actor_get_y (bind->source);
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source_position.z = clutter_actor_get_depth (bind->source);
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switch (bind->bind_axis)
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{
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case CLUTTER_BIND_X_AXIS:
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clutter_actor_set_x (actor, source_position.x + bind->offset);
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break;
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case CLUTTER_BIND_Y_AXIS:
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clutter_actor_set_y (actor, source_position.y + bind->offset);
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break;
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case CLUTTER_BIND_Z_AXIS:
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clutter_actor_set_depth (actor, source_position.z + bind->offset);
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break;
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}
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}
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static void
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source_position_changed (GObject *gobject,
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GParamSpec *pspec,
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ClutterBindConstraint *bind)
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{
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if (strcmp (pspec->name, "x") == 0 ||
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strcmp (pspec->name, "y") == 0 ||
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strcmp (pspec->name, "depth") == 0)
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{
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update_actor_position (bind);
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}
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}
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static void
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source_destroyed (ClutterActor *actor,
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ClutterBindConstraint *bind)
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{
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bind->source = NULL;
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}
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static void
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_clutter_bind_constraint_set_source (ClutterBindConstraint *bind,
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ClutterActor *source)
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{
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ClutterActor *old_source = bind->source;
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if (old_source != NULL)
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{
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g_signal_handlers_disconnect_by_func (old_source,
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G_CALLBACK (source_destroyed),
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bind);
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g_signal_handlers_disconnect_by_func (old_source,
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G_CALLBACK (source_position_changed),
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bind);
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}
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bind->source = source;
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g_signal_connect (bind->source, "notify",
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G_CALLBACK (source_position_changed),
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bind);
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g_signal_connect (bind->source, "destroy",
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G_CALLBACK (source_destroyed),
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bind);
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update_actor_position (bind);
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g_object_notify (G_OBJECT (bind), "source");
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}
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static void
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_clutter_bind_constraint_set_bind_axis (ClutterBindConstraint *bind,
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ClutterBindAxis axis)
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{
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if (bind->bind_axis == axis)
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return;
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bind->bind_axis = axis;
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update_actor_position (bind);
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g_object_notify (G_OBJECT (bind), "bind-axis");
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}
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static void
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_clutter_bind_constraint_set_offset (ClutterBindConstraint *bind,
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gfloat offset)
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{
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if (fabs (bind->offset - offset) < 0.00001f)
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return;
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bind->offset = offset;
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update_actor_position (bind);
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g_object_notify (G_OBJECT (bind), "offset");
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}
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static void
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clutter_bind_constraint_set_property (GObject *gobject,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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ClutterBindConstraint *bind = CLUTTER_BIND_CONSTRAINT (gobject);
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switch (prop_id)
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{
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case PROP_SOURCE:
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_clutter_bind_constraint_set_source (bind, g_value_get_object (value));
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break;
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case PROP_BIND_AXIS:
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_clutter_bind_constraint_set_bind_axis (bind, g_value_get_enum (value));
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break;
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case PROP_OFFSET:
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_clutter_bind_constraint_set_offset (bind, g_value_get_float (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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break;
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}
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}
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static void
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clutter_bind_constraint_get_property (GObject *gobject,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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ClutterBindConstraint *bind = CLUTTER_BIND_CONSTRAINT (gobject);
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switch (prop_id)
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{
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case PROP_SOURCE:
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g_value_set_object (value, bind->source);
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break;
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case PROP_BIND_AXIS:
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g_value_set_enum (value, bind->bind_axis);
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break;
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case PROP_OFFSET:
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g_value_set_float (value, bind->offset);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
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break;
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}
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}
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static void
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clutter_bind_constraint_class_init (ClutterBindConstraintClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GParamSpec *pspec;
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gobject_class->set_property = clutter_bind_constraint_set_property;
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gobject_class->get_property = clutter_bind_constraint_get_property;
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pspec = g_param_spec_object ("source",
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"Source",
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"The source of the binding",
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CLUTTER_TYPE_ACTOR,
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CLUTTER_PARAM_READWRITE |
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G_PARAM_CONSTRUCT);
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g_object_class_install_property (gobject_class, PROP_SOURCE, pspec);
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pspec = g_param_spec_enum ("bind-axis",
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"Bind Axis",
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"The axis to bind the position from",
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CLUTTER_TYPE_BIND_AXIS,
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CLUTTER_BIND_X_AXIS,
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CLUTTER_PARAM_READWRITE |
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G_PARAM_CONSTRUCT);
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g_object_class_install_property (gobject_class, PROP_BIND_AXIS, pspec);
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pspec = g_param_spec_float ("offset",
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"Offset",
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"The offset in pixels to apply to the binding",
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-G_MAXFLOAT, G_MAXFLOAT,
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0.0f,
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CLUTTER_PARAM_READWRITE |
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G_PARAM_CONSTRUCT);
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g_object_class_install_property (gobject_class, PROP_OFFSET, pspec);
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}
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static void
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clutter_bind_constraint_init (ClutterBindConstraint *self)
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{
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self->source = NULL;
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self->bind_axis = CLUTTER_BIND_X_AXIS;
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self->offset = 0.0f;
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}
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ClutterConstraint *
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clutter_bind_constraint_new (ClutterActor *source,
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ClutterBindAxis axis,
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gfloat offset)
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{
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g_return_val_if_fail (CLUTTER_IS_ACTOR (source), NULL);
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return g_object_new (CLUTTER_TYPE_BIND_CONSTRAINT,
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"source", source,
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"bind-axis", axis,
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"offset", offset,
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NULL);
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}
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32
clutter/clutter-bind-constraint.h
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32
clutter/clutter-bind-constraint.h
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@ -0,0 +1,32 @@
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#if !defined(__CLUTTER_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
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#error "Only <clutter/clutter.h> can be included directly."
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#endif
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#ifndef __CLUTTER_BIND_CONSTRAINT_H__
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#define __CLUTTER_BIND_CONSTRAINT_H__
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#include <clutter/clutter-constraint.h>
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G_BEGIN_DECLS
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#define CLUTTER_TYPE_BIND_CONSTRAINT (clutter_bind_constraint_get_type ())
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#define CLUTTER_BIND_CONSTRAINT(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), CLUTTER_TYPE_BIND_CONSTRAINT, ClutterBindConstraint))
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#define CLUTTER_IS_BIND_CONSTRAINT(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), CLUTTER_TYPE_BIND_CONSTRAINT))
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typedef struct _ClutterBindConstraint ClutterBindConstraint;
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typedef enum { /*< prefix=CLUTTER_BIND >*/
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CLUTTER_BIND_X_AXIS,
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CLUTTER_BIND_Y_AXIS,
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CLUTTER_BIND_Z_AXIS
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} ClutterBindAxis;
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GType clutter_bind_constraint_get_type (void) G_GNUC_CONST;
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ClutterConstraint *clutter_bind_constraint_new (ClutterActor *source,
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ClutterBindAxis axis,
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gfloat offset);
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G_END_DECLS
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#endif /* __CLUTTER_BIND_CONSTRAINT_H__ */
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@ -45,6 +45,7 @@
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#include "clutter-behaviour-path.h"
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#include "clutter-behaviour-rotate.h"
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#include "clutter-behaviour-scale.h"
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#include "clutter-bind-constraint.h"
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#include "clutter-binding-pool.h"
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#include "clutter-bin-layout.h"
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#include "clutter-box.h"
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