/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* st-adjustment.c: Adjustment object
*
* Copyright 2008 OpenedHand
* Copyright 2009 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU Lesser General Public License,
* version 2.1, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
* more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see .
*/
/**
* SECTION:st-adjustment
* @short_description: A GObject representing an adjustable bounded value
*
* The #StAdjustment object represents a range of values bounded between a
* minimum and maximum, together with step and page increments and a page size.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include
#include
#include
#include "st-adjustment.h"
#include "st-private.h"
typedef struct _StAdjustmentPrivate StAdjustmentPrivate;
struct _StAdjustmentPrivate
{
ClutterActor *actor;
/* Do not sanity-check values while constructing,
* not all properties may be set yet. */
guint is_constructing : 1;
GHashTable *transitions;
gdouble lower;
gdouble upper;
gdouble value;
gdouble step_increment;
gdouble page_increment;
gdouble page_size;
};
static void animatable_iface_init (ClutterAnimatableInterface *iface);
G_DEFINE_TYPE_WITH_CODE (StAdjustment, st_adjustment, G_TYPE_OBJECT,
G_ADD_PRIVATE (StAdjustment)
G_IMPLEMENT_INTERFACE (CLUTTER_TYPE_ANIMATABLE,
animatable_iface_init));
enum
{
PROP_0,
PROP_ACTOR,
PROP_LOWER,
PROP_UPPER,
PROP_VALUE,
PROP_STEP_INC,
PROP_PAGE_INC,
PROP_PAGE_SIZE,
N_PROPS
};
static GParamSpec *props[N_PROPS] = { NULL, };
enum
{
CHANGED,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = { 0, };
typedef struct _TransitionClosure
{
StAdjustment *adjustment;
ClutterTransition *transition;
char *name;
gulong completed_id;
} TransitionClosure;
static gboolean st_adjustment_set_lower (StAdjustment *adjustment,
gdouble lower);
static gboolean st_adjustment_set_upper (StAdjustment *adjustment,
gdouble upper);
static gboolean st_adjustment_set_step_increment (StAdjustment *adjustment,
gdouble step);
static gboolean st_adjustment_set_page_increment (StAdjustment *adjustment,
gdouble page);
static gboolean st_adjustment_set_page_size (StAdjustment *adjustment,
gdouble size);
static ClutterActor *
st_adjustment_get_actor (ClutterAnimatable *animatable)
{
StAdjustment *adjustment = ST_ADJUSTMENT (animatable);
StAdjustmentPrivate *priv = st_adjustment_get_instance_private (adjustment);
g_warn_if_fail (priv->actor);
return priv->actor;
}
static void
animatable_iface_init (ClutterAnimatableInterface *iface)
{
iface->get_actor = st_adjustment_get_actor;
}
static void
st_adjustment_constructed (GObject *object)
{
GObjectClass *g_class;
StAdjustment *self = ST_ADJUSTMENT (object);
StAdjustmentPrivate *priv = st_adjustment_get_instance_private (self);
g_class = G_OBJECT_CLASS (st_adjustment_parent_class);
/* The docs say we're suppose to chain up, but would crash without
* some extra care. */
if (g_class && g_class->constructed &&
g_class->constructed != st_adjustment_constructed)
{
g_class->constructed (object);
}
priv->is_constructing = FALSE;
st_adjustment_clamp_page (self, priv->lower, priv->upper);
}
static void
st_adjustment_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
StAdjustmentPrivate *priv = st_adjustment_get_instance_private (ST_ADJUSTMENT (gobject));
switch (prop_id)
{
case PROP_ACTOR:
g_value_set_object (value, priv->actor);
break;
case PROP_LOWER:
g_value_set_double (value, priv->lower);
break;
case PROP_UPPER:
g_value_set_double (value, priv->upper);
break;
case PROP_VALUE:
g_value_set_double (value, priv->value);
break;
case PROP_STEP_INC:
g_value_set_double (value, priv->step_increment);
break;
case PROP_PAGE_INC:
g_value_set_double (value, priv->page_increment);
break;
case PROP_PAGE_SIZE:
g_value_set_double (value, priv->page_size);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
actor_destroyed (gpointer user_data,
GObject *where_the_object_was)
{
StAdjustment *adj = ST_ADJUSTMENT (user_data);
StAdjustmentPrivate *priv = st_adjustment_get_instance_private (adj);
priv->actor = NULL;
g_object_notify_by_pspec (G_OBJECT (adj), props[PROP_ACTOR]);
}
static void
st_adjustment_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
StAdjustment *adj = ST_ADJUSTMENT (gobject);
StAdjustmentPrivate *priv;
priv = st_adjustment_get_instance_private (ST_ADJUSTMENT (gobject));
switch (prop_id)
{
case PROP_ACTOR:
if (priv->actor)
g_object_weak_unref (G_OBJECT (priv->actor), actor_destroyed, adj);
priv->actor = g_value_get_object (value);
if (priv->actor)
g_object_weak_ref (G_OBJECT (priv->actor), actor_destroyed, adj);
break;
case PROP_LOWER:
st_adjustment_set_lower (adj, g_value_get_double (value));
break;
case PROP_UPPER:
st_adjustment_set_upper (adj, g_value_get_double (value));
break;
case PROP_VALUE:
st_adjustment_set_value (adj, g_value_get_double (value));
break;
case PROP_STEP_INC:
st_adjustment_set_step_increment (adj, g_value_get_double (value));
break;
case PROP_PAGE_INC:
st_adjustment_set_page_increment (adj, g_value_get_double (value));
break;
case PROP_PAGE_SIZE:
st_adjustment_set_page_size (adj, g_value_get_double (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
break;
}
}
static void
st_adjustment_dispose (GObject *object)
{
StAdjustmentPrivate *priv;
priv = st_adjustment_get_instance_private (ST_ADJUSTMENT (object));
if (priv->actor)
{
g_object_weak_unref (G_OBJECT (priv->actor), actor_destroyed, object);
priv->actor = NULL;
}
g_clear_pointer (&priv->transitions, g_hash_table_unref);
G_OBJECT_CLASS (st_adjustment_parent_class)->dispose (object);
}
static void
st_adjustment_class_init (StAdjustmentClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->constructed = st_adjustment_constructed;
object_class->get_property = st_adjustment_get_property;
object_class->set_property = st_adjustment_set_property;
object_class->dispose = st_adjustment_dispose;
/**
* StAdjustment:actor:
*
* If the adjustment is used as #ClutterAnimatable for a
* #ClutterPropertyTransition, this property is used to determine which
* monitor should drive the animation.
*/
props[PROP_ACTOR] =
g_param_spec_object ("actor", "Actor", "Actor",
CLUTTER_TYPE_ACTOR,
ST_PARAM_READWRITE);
/**
* StAdjustment:lower:
*
* The minimum value of the adjustment.
*/
props[PROP_LOWER] =
g_param_spec_double ("lower", "Lower", "Lower bound",
-G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
ST_PARAM_READWRITE |
G_PARAM_CONSTRUCT |
G_PARAM_EXPLICIT_NOTIFY);
/**
* StAdjustment:upper:
*
* The maximum value of the adjustment.
*
* Note that values will be restricted by `upper - page-size` if
* #StAdjustment:page-size is non-zero.
*/
props[PROP_UPPER] =
g_param_spec_double ("upper", "Upper", "Upper bound",
-G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
ST_PARAM_READWRITE |
G_PARAM_CONSTRUCT |
G_PARAM_EXPLICIT_NOTIFY);
/**
* StAdjustment:value:
*
* The value of the adjustment.
*/
props[PROP_VALUE] =
g_param_spec_double ("value", "Value", "Current value",
-G_MAXDOUBLE, G_MAXDOUBLE, 0.0,
ST_PARAM_READWRITE |
G_PARAM_CONSTRUCT |
G_PARAM_EXPLICIT_NOTIFY);
/**
* StAdjustment:step-increment:
*
* The step increment of the adjustment.
*/
props[PROP_STEP_INC] =
g_param_spec_double ("step-increment", "Step Increment", "Step increment",
0.0, G_MAXDOUBLE, 0.0,
ST_PARAM_READWRITE |
G_PARAM_CONSTRUCT |
G_PARAM_EXPLICIT_NOTIFY);
/**
* StAdjustment:page-increment:
*
* The page increment of the adjustment.
*/
props[PROP_PAGE_INC] =
g_param_spec_double ("page-increment", "Page Increment", "Page increment",
0.0, G_MAXDOUBLE, 0.0,
ST_PARAM_READWRITE |
G_PARAM_CONSTRUCT |
G_PARAM_EXPLICIT_NOTIFY);
/**
* StAdjustment:page-size:
*
* The page size of the adjustment.
*
* Note that the page-size is irrelevant and should be set to zero if the
* adjustment is used for a simple scalar value.
*/
props[PROP_PAGE_SIZE] =
g_param_spec_double ("page-size", "Page Size", "Page size",
0.0, G_MAXDOUBLE, 0.0,
ST_PARAM_READWRITE |
G_PARAM_CONSTRUCT |
G_PARAM_EXPLICIT_NOTIFY);
g_object_class_install_properties (object_class, N_PROPS, props);
/**
* StAdjustment::changed:
* @self: the #StAdjustment
*
* Emitted when any of the adjustment values have changed
*/
signals[CHANGED] =
g_signal_new ("changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (StAdjustmentClass, changed),
NULL, NULL, NULL,
G_TYPE_NONE, 0);
}
static void
st_adjustment_init (StAdjustment *self)
{
StAdjustmentPrivate *priv = st_adjustment_get_instance_private (self);
priv->is_constructing = TRUE;
}
/**
* st_adjustment_new:
* @actor: (nullable): a #ClutterActor
* @value: the initial value
* @lower: the minimum value
* @upper: the maximum value
* @step_increment: the step increment
* @page_increment: the page increment
* @page_size: the page size
*
* Creates a new #StAdjustment
*
* Returns: a new #StAdjustment
*/
StAdjustment *
st_adjustment_new (ClutterActor *actor,
gdouble value,
gdouble lower,
gdouble upper,
gdouble step_increment,
gdouble page_increment,
gdouble page_size)
{
return g_object_new (ST_TYPE_ADJUSTMENT,
"actor", actor,
"value", value,
"lower", lower,
"upper", upper,
"step-increment", step_increment,
"page-increment", page_increment,
"page-size", page_size,
NULL);
}
/**
* st_adjustment_get_value:
* @adjustment: a #StAdjustment
*
* Gets the current value of the adjustment. See st_adjustment_set_value().
*
* Returns: The current value of the adjustment
*/
gdouble
st_adjustment_get_value (StAdjustment *adjustment)
{
g_return_val_if_fail (ST_IS_ADJUSTMENT (adjustment), 0);
return ((StAdjustmentPrivate *)st_adjustment_get_instance_private (adjustment))->value;
}
/**
* st_adjustment_set_value:
* @adjustment: a #StAdjustment
* @value: the new value
*
* Sets the #StAdjustment value. The value is clamped to lie between
* #StAdjustment:lower and #StAdjustment:upper - #StAdjustment:page-size.
*/
void
st_adjustment_set_value (StAdjustment *adjustment,
gdouble value)
{
StAdjustmentPrivate *priv;
g_return_if_fail (ST_IS_ADJUSTMENT (adjustment));
priv = st_adjustment_get_instance_private (adjustment);
/* Defer clamp until after construction. */
if (!priv->is_constructing)
{
value = CLAMP (value,
priv->lower,
MAX (priv->lower, priv->upper - priv->page_size));
}
if (priv->value != value)
{
priv->value = value;
g_object_notify_by_pspec (G_OBJECT (adjustment), props[PROP_VALUE]);
}
}
/**
* st_adjustment_clamp_page:
* @adjustment: a #StAdjustment
* @lower: the lower value
* @upper: the upper value
*
* Set #StAdjustment:value to a value clamped between @lower and @upper. The
* clamping described by st_adjustment_set_value() still applies.
*/
void
st_adjustment_clamp_page (StAdjustment *adjustment,
gdouble lower,
gdouble upper)
{
StAdjustmentPrivate *priv;
gboolean changed;
g_return_if_fail (ST_IS_ADJUSTMENT (adjustment));
priv = st_adjustment_get_instance_private (adjustment);
lower = CLAMP (lower, priv->lower, priv->upper - priv->page_size);
upper = CLAMP (upper, priv->lower + priv->page_size, priv->upper);
changed = FALSE;
if (priv->value + priv->page_size > upper)
{
priv->value = upper - priv->page_size;
changed = TRUE;
}
if (priv->value < lower)
{
priv->value = lower;
changed = TRUE;
}
if (changed)
g_object_notify_by_pspec (G_OBJECT (adjustment), props[PROP_VALUE]);
}
/**
* st_adjustment_set_lower:
* @adjustment: a #StAdjustment
* @lower: the new minimum value
*
* Sets the minimum value of the adjustment.
*
* When setting multiple adjustment properties via their individual
* setters, multiple #GObject::notify and #StAdjustment::changed
* signals will be emitted. However, it’s possible to compress the
* #GObject::notify signals into one by calling
* g_object_freeze_notify() and g_object_thaw_notify() around the
* calls to the individual setters.
*
* Alternatively, using st_adjustment_set_values() will compress both
* #GObject::notify and #StAdjustment::changed emissions.
*/
static gboolean
st_adjustment_set_lower (StAdjustment *adjustment,
gdouble lower)
{
StAdjustmentPrivate *priv = st_adjustment_get_instance_private (adjustment);
if (priv->lower != lower)
{
priv->lower = lower;
g_signal_emit (adjustment, signals[CHANGED], 0);
g_object_notify_by_pspec (G_OBJECT (adjustment), props[PROP_LOWER]);
/* Defer clamp until after construction. */
if (!priv->is_constructing)
st_adjustment_clamp_page (adjustment, priv->lower, priv->upper);
return TRUE;
}
return FALSE;
}
/**
* st_adjustment_set_upper:
* @adjustment: a #StAdjustment
* @upper: the new maximum value
*
* Sets the maximum value of the adjustment.
*
* Note that values will be restricted by `upper - page-size`
* if the page-size property is nonzero.
*
* See st_adjustment_set_lower() about how to compress multiple
* signal emissions when setting multiple adjustment properties.
*
* Returns: %TRUE if the value was changed
*/
static gboolean
st_adjustment_set_upper (StAdjustment *adjustment,
gdouble upper)
{
StAdjustmentPrivate *priv = st_adjustment_get_instance_private (adjustment);
if (priv->upper != upper)
{
priv->upper = upper;
g_signal_emit (adjustment, signals[CHANGED], 0);
g_object_notify_by_pspec (G_OBJECT (adjustment), props[PROP_UPPER]);
/* Defer clamp until after construction. */
if (!priv->is_constructing)
st_adjustment_clamp_page (adjustment, priv->lower, priv->upper);
return TRUE;
}
return FALSE;
}
/**
* st_adjustment_set_step_increment:
* @adjustment: a #StAdjustment
* @step: the new step increment
*
* Sets the step increment of the adjustment.
*
* See st_adjustment_set_lower() about how to compress multiple
* signal emissions when setting multiple adjustment properties.
*
* Returns: %TRUE if the value was changed
*/
static gboolean
st_adjustment_set_step_increment (StAdjustment *adjustment,
gdouble step)
{
StAdjustmentPrivate *priv = st_adjustment_get_instance_private (adjustment);
if (priv->step_increment != step)
{
priv->step_increment = step;
g_signal_emit (adjustment, signals[CHANGED], 0);
g_object_notify_by_pspec (G_OBJECT (adjustment), props[PROP_STEP_INC]);
return TRUE;
}
return FALSE;
}
/**
* st_adjustment_set_page_increment:
* @adjustment: a #StAdjustment
* @page: the new page increment
*
* Sets the page increment of the adjustment.
*
* See st_adjustment_set_lower() about how to compress multiple
* signal emissions when setting multiple adjustment properties.
*
* Returns: %TRUE if the value was changed
*/
static gboolean
st_adjustment_set_page_increment (StAdjustment *adjustment,
gdouble page)
{
StAdjustmentPrivate *priv = st_adjustment_get_instance_private (adjustment);
if (priv->page_increment != page)
{
priv->page_increment = page;
g_signal_emit (adjustment, signals[CHANGED], 0);
g_object_notify_by_pspec (G_OBJECT (adjustment), props[PROP_PAGE_INC]);
return TRUE;
}
return FALSE;
}
/**
* st_adjustment_set_page_size:
* @adjustment: a #StAdjustment
* @size: the new page size
*
* Sets the page size of the adjustment.
*
* See st_adjustment_set_lower() about how to compress multiple
* signal emissions when setting multiple adjustment properties.
*
* Returns: %TRUE if the value was changed
*/
static gboolean
st_adjustment_set_page_size (StAdjustment *adjustment,
gdouble size)
{
StAdjustmentPrivate *priv = st_adjustment_get_instance_private (adjustment);
if (priv->page_size != size)
{
priv->page_size = size;
g_signal_emit (adjustment, signals[CHANGED], 0);
g_object_notify_by_pspec (G_OBJECT (adjustment), props[PROP_PAGE_SIZE]);
/* Well explicitely clamp after construction. */
if (!priv->is_constructing)
st_adjustment_clamp_page (adjustment, priv->lower, priv->upper);
return TRUE;
}
return FALSE;
}
/**
* st_adjustment_set_values:
* @adjustment: a #StAdjustment
* @value: the new value
* @lower: the new minimum value
* @upper: the new maximum value
* @step_increment: the new step increment
* @page_increment: the new page increment
* @page_size: the new page size
*
* Sets all properties of the adjustment at once.
*
* Use this function to avoid multiple emissions of the #GObject::notify and
* #StAdjustment::changed signals. See st_adjustment_set_lower() for an
* alternative way of compressing multiple emissions of #GObject::notify into
* one.
*/
void
st_adjustment_set_values (StAdjustment *adjustment,
gdouble value,
gdouble lower,
gdouble upper,
gdouble step_increment,
gdouble page_increment,
gdouble page_size)
{
StAdjustmentPrivate *priv;
gboolean emit_changed = FALSE;
g_return_if_fail (ST_IS_ADJUSTMENT (adjustment));
g_return_if_fail (page_size >= 0 && page_size <= G_MAXDOUBLE);
g_return_if_fail (step_increment >= 0 && step_increment <= G_MAXDOUBLE);
g_return_if_fail (page_increment >= 0 && page_increment <= G_MAXDOUBLE);
priv = st_adjustment_get_instance_private (adjustment);
emit_changed = FALSE;
g_object_freeze_notify (G_OBJECT (adjustment));
emit_changed |= st_adjustment_set_lower (adjustment, lower);
emit_changed |= st_adjustment_set_upper (adjustment, upper);
emit_changed |= st_adjustment_set_step_increment (adjustment, step_increment);
emit_changed |= st_adjustment_set_page_increment (adjustment, page_increment);
emit_changed |= st_adjustment_set_page_size (adjustment, page_size);
if (value != priv->value)
{
st_adjustment_set_value (adjustment, value);
emit_changed = TRUE;
}
if (emit_changed)
g_signal_emit (G_OBJECT (adjustment), signals[CHANGED], 0);
g_object_thaw_notify (G_OBJECT (adjustment));
}
/**
* st_adjustment_get_values:
* @adjustment: an #StAdjustment
* @value: (out) (optional): the current value
* @lower: (out) (optional): the lower bound
* @upper: (out) (optional): the upper bound
* @step_increment: (out) (optional): the step increment
* @page_increment: (out) (optional): the page increment
* @page_size: (out) (optional): the page size
*
* Gets all of @adjustment's values at once.
*/
void
st_adjustment_get_values (StAdjustment *adjustment,
gdouble *value,
gdouble *lower,
gdouble *upper,
gdouble *step_increment,
gdouble *page_increment,
gdouble *page_size)
{
StAdjustmentPrivate *priv;
g_return_if_fail (ST_IS_ADJUSTMENT (adjustment));
priv = st_adjustment_get_instance_private (adjustment);
if (lower)
*lower = priv->lower;
if (upper)
*upper = priv->upper;
if (value)
*value = st_adjustment_get_value (adjustment);
if (step_increment)
*step_increment = priv->step_increment;
if (page_increment)
*page_increment = priv->page_increment;
if (page_size)
*page_size = priv->page_size;
}
/**
* st_adjustment_adjust_for_scroll_event:
* @adjustment: An #StAdjustment
* @delta: A delta, retrieved directly from clutter_event_get_scroll_delta()
* or similar.
*
* Adjusts the adjustment using delta values from a scroll event.
* You should use this instead of using st_adjustment_set_value()
* as this method will tweak the values directly using the same
* math as GTK+, to ensure that scrolling is consistent across
* the environment.
*/
void
st_adjustment_adjust_for_scroll_event (StAdjustment *adjustment,
gdouble delta)
{
StAdjustmentPrivate *priv;
gdouble new_value, scroll_unit;
g_return_if_fail (ST_IS_ADJUSTMENT (adjustment));
priv = st_adjustment_get_instance_private (adjustment);
scroll_unit = pow (priv->page_size, 2.0 / 3.0);
new_value = priv->value + delta * scroll_unit;
st_adjustment_set_value (adjustment, new_value);
}
static void
transition_closure_free (gpointer data)
{
TransitionClosure *clos;
ClutterTimeline *timeline;
if (G_UNLIKELY (data == NULL))
return;
clos = data;
timeline = CLUTTER_TIMELINE (clos->transition);
g_clear_signal_handler (&clos->completed_id, clos->transition);
if (clutter_timeline_is_playing (timeline))
clutter_timeline_stop (timeline);
g_object_unref (clos->transition);
g_free (clos->name);
g_free (clos);
}
static void
remove_transition (StAdjustment *adjustment,
const char *name)
{
StAdjustmentPrivate *priv = st_adjustment_get_instance_private (adjustment);
g_hash_table_remove (priv->transitions, name);
if (g_hash_table_size (priv->transitions) == 0)
g_clear_pointer (&priv->transitions, g_hash_table_unref);
}
static void
on_transition_stopped (ClutterTransition *transition,
gboolean is_finished,
TransitionClosure *clos)
{
StAdjustment *adjustment = clos->adjustment;
if (!clutter_transition_get_remove_on_complete (transition))
return;
/* Take a reference, because removing the closure will
* release the reference on the transition, and we want
* it to survive the signal emission; ClutterTransition's
* own ::stopped signal closure will release it after all
* other handlers have run.
*/
g_object_ref (transition);
remove_transition (adjustment, clos->name);
}
/**
* st_adjustment_get_transition:
* @adjustment: a #StAdjustment
* @name: a transition name
*
* Get the #ClutterTransition for @name previously added with
* st_adjustment_add_transition() or %NULL if not found.
*
* Returns: (transfer none) (nullable): a #ClutterTransition
*/
ClutterTransition *
st_adjustment_get_transition (StAdjustment *adjustment,
const char *name)
{
StAdjustmentPrivate *priv;
TransitionClosure *clos;
g_return_val_if_fail (ST_IS_ADJUSTMENT (adjustment), NULL);
priv = st_adjustment_get_instance_private (adjustment);
if (priv->transitions == NULL)
return NULL;
clos = g_hash_table_lookup (priv->transitions, name);
if (clos == NULL)
return NULL;
return clos->transition;
}
/**
* st_adjustment_add_transition:
* @adjustment: a #StAdjustment
* @name: a unique name for the transition
* @transtion: a #ClutterTransition
*
* Add a #ClutterTransition for the adjustment. If the transiton stops, it will
* be automatically removed if #ClutterTransition:remove-on-complete is %TRUE.
*/
void
st_adjustment_add_transition (StAdjustment *adjustment,
const char *name,
ClutterTransition *transition)
{
StAdjustmentPrivate *priv;
TransitionClosure *clos;
g_return_if_fail (ST_IS_ADJUSTMENT (adjustment));
g_return_if_fail (name != NULL);
g_return_if_fail (CLUTTER_IS_TRANSITION (transition));
priv = st_adjustment_get_instance_private (adjustment);
if (priv->transitions == NULL)
priv->transitions = g_hash_table_new_full (g_str_hash, g_str_equal,
NULL,
transition_closure_free);
if (g_hash_table_lookup (priv->transitions, name) != NULL)
{
g_warning ("A transition with name '%s' already exists for "
"adjustment '%p'", name, adjustment);
return;
}
clutter_transition_set_animatable (transition, CLUTTER_ANIMATABLE (adjustment));
clos = g_new (TransitionClosure, 1);
clos->adjustment = adjustment;
clos->transition = g_object_ref (transition);
clos->name = g_strdup (name);
clos->completed_id = g_signal_connect (transition, "stopped",
G_CALLBACK (on_transition_stopped),
clos);
g_hash_table_insert (priv->transitions, clos->name, clos);
clutter_timeline_start (CLUTTER_TIMELINE (transition));
}
/**
* st_adjusmtent_remove_transition:
* @adjusment: a #StAdjustment
* @name: the name of the transition to remove
*
* Remove a #ClutterTransition previously added by st_adjustment_add_transtion()
* with @name.
*/
void
st_adjustment_remove_transition (StAdjustment *adjustment,
const char *name)
{
StAdjustmentPrivate *priv;
TransitionClosure *clos;
g_return_if_fail (ST_IS_ADJUSTMENT (adjustment));
g_return_if_fail (name != NULL);
priv = st_adjustment_get_instance_private (adjustment);
if (priv->transitions == NULL)
return;
clos = g_hash_table_lookup (priv->transitions, name);
if (clos == NULL)
return;
remove_transition (adjustment, name);
}