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diff --git a/src/st/st-adjustment.c b/src/st/st-adjustment.c new file mode 100644 index 0000000..5235cb2 --- /dev/null +++ b/src/st/st-adjustment.c @@ -0,0 +1,999 @@ +/* -*- 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 <http://www.gnu.org/licenses/>. + */ + +/** + * 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 <glib-object.h> +#include <clutter/clutter.h> +#include <math.h> + +#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 properties have changed, except for + * #StAdjustment:value. + */ + 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]); + + /* We'll explicitly 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 + * @transition: a #ClutterTransition + * + * Add a #ClutterTransition for the adjustment. If the transition 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: + * @adjustment: 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); +} |