/* GTK - The GIMP Toolkit * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that 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 library. If not, see . */ /* * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS * file for a list of people on the GTK+ Team. See the ChangeLog * files for a list of changes. These files are distributed with * GTK+ at ftp://ftp.gtk.org/pub/gtk/. */ #include "config.h" #include "gtkadjustment.h" #include "gtkmarshalers.h" #include "gtkprivate.h" #include "gtkintl.h" /** * SECTION:gtkadjustment * @Short_description: A representation of an adjustable bounded value * @Title: GtkAdjustment * * The #GtkAdjustment object represents a value which has an associated lower * and upper bound, together with step and page increments, and a page size. * It is used within several GTK+ widgets, including * #GtkSpinButton, #GtkViewport, and #GtkRange (which is a base class for * #GtkHScrollbar, #GtkVScrollbar, #GtkHScale, and #GtkVScale). * * The #GtkAdjustment object does not update the value itself. Instead * it is left up to the owner of the #GtkAdjustment to control the value. * * The owner of the #GtkAdjustment typically calls the * gtk_adjustment_value_changed() and gtk_adjustment_changed() functions * after changing the value and its bounds. This results in the emission of the * #GtkAdjustment::value_changed or #GtkAdjustment::changed signal respectively. */ struct _GtkAdjustmentPrivate { gdouble lower; gdouble upper; gdouble value; gdouble step_increment; gdouble page_increment; gdouble page_size; gdouble source; gdouble target; guint duration; gint64 start_time; gint64 end_time; guint tick_id; GdkFrameClock *clock; }; enum { PROP_0, PROP_VALUE, PROP_LOWER, PROP_UPPER, PROP_STEP_INCREMENT, PROP_PAGE_INCREMENT, PROP_PAGE_SIZE }; enum { CHANGED, VALUE_CHANGED, LAST_SIGNAL }; static void gtk_adjustment_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec); static void gtk_adjustment_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec); static void gtk_adjustment_dispatch_properties_changed (GObject *object, guint n_pspecs, GParamSpec **pspecs); static guint adjustment_signals[LAST_SIGNAL] = { 0 }; static guint64 adjustment_changed_stamp = 0; /* protected by global gdk lock */ G_DEFINE_TYPE_WITH_PRIVATE (GtkAdjustment, gtk_adjustment, G_TYPE_INITIALLY_UNOWNED) static void gtk_adjustment_finalize (GObject *object) { GtkAdjustment *adjustment = GTK_ADJUSTMENT (object); GtkAdjustmentPrivate *priv = adjustment->priv; if (priv->tick_id) g_signal_handler_disconnect (priv->clock, priv->tick_id); if (priv->clock) g_object_unref (priv->clock); G_OBJECT_CLASS (gtk_adjustment_parent_class)->finalize (object); } static void gtk_adjustment_class_init (GtkAdjustmentClass *class) { GObjectClass *gobject_class = G_OBJECT_CLASS (class); gobject_class->finalize = gtk_adjustment_finalize; gobject_class->set_property = gtk_adjustment_set_property; gobject_class->get_property = gtk_adjustment_get_property; gobject_class->dispatch_properties_changed = gtk_adjustment_dispatch_properties_changed; class->changed = NULL; class->value_changed = NULL; /** * GtkAdjustment:value: * * The value of the adjustment. * * Since: 2.4 */ g_object_class_install_property (gobject_class, PROP_VALUE, g_param_spec_double ("value", P_("Value"), P_("The value of the adjustment"), -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, GTK_PARAM_READWRITE)); /** * GtkAdjustment:lower: * * The minimum value of the adjustment. * * Since: 2.4 */ g_object_class_install_property (gobject_class, PROP_LOWER, g_param_spec_double ("lower", P_("Minimum Value"), P_("The minimum value of the adjustment"), -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, GTK_PARAM_READWRITE)); /** * GtkAdjustment:upper: * * The maximum value of the adjustment. * Note that values will be restricted by * `upper - page-size` if the page-size * property is nonzero. * * Since: 2.4 */ g_object_class_install_property (gobject_class, PROP_UPPER, g_param_spec_double ("upper", P_("Maximum Value"), P_("The maximum value of the adjustment"), -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, GTK_PARAM_READWRITE)); /** * GtkAdjustment:step-increment: * * The step increment of the adjustment. * * Since: 2.4 */ g_object_class_install_property (gobject_class, PROP_STEP_INCREMENT, g_param_spec_double ("step-increment", P_("Step Increment"), P_("The step increment of the adjustment"), -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, GTK_PARAM_READWRITE)); /** * GtkAdjustment:page-increment: * * The page increment of the adjustment. * * Since: 2.4 */ g_object_class_install_property (gobject_class, PROP_PAGE_INCREMENT, g_param_spec_double ("page-increment", P_("Page Increment"), P_("The page increment of the adjustment"), -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, GTK_PARAM_READWRITE)); /** * GtkAdjustment: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, e.g. in a * #GtkSpinButton. * * Since: 2.4 */ g_object_class_install_property (gobject_class, PROP_PAGE_SIZE, g_param_spec_double ("page-size", P_("Page Size"), P_("The page size of the adjustment"), -G_MAXDOUBLE, G_MAXDOUBLE, 0.0, GTK_PARAM_READWRITE)); /** * GtkAdjustment::changed: * @adjustment: the object which received the signal. * * Emitted when one or more of the #GtkAdjustment properties have been * changed, other than the #GtkAdjustment:value property. */ adjustment_signals[CHANGED] = g_signal_new (I_("changed"), G_OBJECT_CLASS_TYPE (class), G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE, G_STRUCT_OFFSET (GtkAdjustmentClass, changed), NULL, NULL, _gtk_marshal_VOID__VOID, G_TYPE_NONE, 0); /** * GtkAdjustment::value-changed: * @adjustment: the object which received the signal. * * Emitted when the #GtkAdjustment:value property has been changed. */ adjustment_signals[VALUE_CHANGED] = g_signal_new (I_("value-changed"), G_OBJECT_CLASS_TYPE (class), G_SIGNAL_RUN_FIRST | G_SIGNAL_NO_RECURSE, G_STRUCT_OFFSET (GtkAdjustmentClass, value_changed), NULL, NULL, _gtk_marshal_VOID__VOID, G_TYPE_NONE, 0); } static void gtk_adjustment_init (GtkAdjustment *adjustment) { adjustment->priv = gtk_adjustment_get_instance_private (adjustment); } static void gtk_adjustment_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GtkAdjustment *adjustment = GTK_ADJUSTMENT (object); GtkAdjustmentPrivate *priv = adjustment->priv; switch (prop_id) { case PROP_VALUE: g_value_set_double (value, priv->value); 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_STEP_INCREMENT: g_value_set_double (value, priv->step_increment); break; case PROP_PAGE_INCREMENT: 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 (object, prop_id, pspec); break; } } static void gtk_adjustment_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec) { GtkAdjustment *adjustment = GTK_ADJUSTMENT (object); gdouble double_value = g_value_get_double (value); GtkAdjustmentPrivate *priv = adjustment->priv; switch (prop_id) { case PROP_VALUE: gtk_adjustment_set_value (adjustment, double_value); break; case PROP_LOWER: priv->lower = double_value; break; case PROP_UPPER: priv->upper = double_value; break; case PROP_STEP_INCREMENT: priv->step_increment = double_value; break; case PROP_PAGE_INCREMENT: priv->page_increment = double_value; break; case PROP_PAGE_SIZE: priv->page_size = double_value; break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gtk_adjustment_dispatch_properties_changed (GObject *object, guint n_pspecs, GParamSpec **pspecs) { gboolean changed = FALSE; gint i; G_OBJECT_CLASS (gtk_adjustment_parent_class)->dispatch_properties_changed (object, n_pspecs, pspecs); for (i = 0; i < n_pspecs; i++) switch (pspecs[i]->param_id) { case PROP_LOWER: case PROP_UPPER: case PROP_STEP_INCREMENT: case PROP_PAGE_INCREMENT: case PROP_PAGE_SIZE: changed = TRUE; break; default: break; } if (changed) { adjustment_changed_stamp++; gtk_adjustment_changed (GTK_ADJUSTMENT (object)); } } /** * gtk_adjustment_new: * @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 #GtkAdjustment. * * Returns: a new #GtkAdjustment. */ GtkAdjustment * gtk_adjustment_new (gdouble value, gdouble lower, gdouble upper, gdouble step_increment, gdouble page_increment, gdouble page_size) { return g_object_new (GTK_TYPE_ADJUSTMENT, "lower", lower, "upper", upper, "step-increment", step_increment, "page-increment", page_increment, "page-size", page_size, "value", value, NULL); } /** * gtk_adjustment_get_value: * @adjustment: a #GtkAdjustment * * Gets the current value of the adjustment. See * gtk_adjustment_set_value (). * * Returns: The current value of the adjustment. **/ gdouble gtk_adjustment_get_value (GtkAdjustment *adjustment) { g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0); return adjustment->priv->value; } gdouble gtk_adjustment_get_target_value (GtkAdjustment *adjustment) { g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0); if (adjustment->priv->tick_id) return adjustment->priv->target; else return adjustment->priv->value; } static void adjustment_set_value (GtkAdjustment *adjustment, gdouble value) { if (adjustment->priv->value != value) { adjustment->priv->value = value; gtk_adjustment_value_changed (adjustment); } } static void gtk_adjustment_on_frame_clock_update (GdkFrameClock *clock, GtkAdjustment *adjustment); static void gtk_adjustment_begin_updating (GtkAdjustment *adjustment) { GtkAdjustmentPrivate *priv = adjustment->priv; if (priv->tick_id == 0) { priv->tick_id = g_signal_connect (priv->clock, "update", G_CALLBACK (gtk_adjustment_on_frame_clock_update), adjustment); gdk_frame_clock_begin_updating (priv->clock); } } static void gtk_adjustment_end_updating (GtkAdjustment *adjustment) { GtkAdjustmentPrivate *priv = adjustment->priv; if (priv->tick_id != 0) { g_signal_handler_disconnect (priv->clock, priv->tick_id); priv->tick_id = 0; gdk_frame_clock_end_updating (priv->clock); } } /* From clutter-easing.c, based on Robert Penner's * infamous easing equations, MIT license. */ static gdouble ease_out_cubic (gdouble t) { gdouble p = t - 1; return p * p * p + 1; } static void gtk_adjustment_on_frame_clock_update (GdkFrameClock *clock, GtkAdjustment *adjustment) { GtkAdjustmentPrivate *priv = adjustment->priv; gint64 now; now = gdk_frame_clock_get_frame_time (clock); if (now < priv->end_time) { gdouble t; t = (now - priv->start_time) / (gdouble) (priv->end_time - priv->start_time); t = ease_out_cubic (t); adjustment_set_value (adjustment, priv->source + t * (priv->target - priv->source)); } else { adjustment_set_value (adjustment, priv->target); gtk_adjustment_end_updating (adjustment); } } static void gtk_adjustment_set_value_internal (GtkAdjustment *adjustment, gdouble value, gboolean animate) { GtkAdjustmentPrivate *priv = adjustment->priv; /* don't use CLAMP() so we don't end up below lower if upper - page_size * is smaller than lower */ value = MIN (value, priv->upper - priv->page_size); value = MAX (value, priv->lower); if (animate && priv->duration != 0 && priv->clock != NULL) { if (priv->target == value) return; priv->source = priv->value; priv->target = value; priv->start_time = gdk_frame_clock_get_frame_time (priv->clock); priv->end_time = priv->start_time + 1000 * priv->duration; gtk_adjustment_begin_updating (adjustment); } else { gtk_adjustment_end_updating (adjustment); adjustment_set_value (adjustment, value); } } /** * gtk_adjustment_set_value: * @adjustment: a #GtkAdjustment. * @value: the new value. * * Sets the #GtkAdjustment value. The value is clamped to lie between * #GtkAdjustment:lower and #GtkAdjustment:upper. * * Note that for adjustments which are used in a #GtkScrollbar, the effective * range of allowed values goes from #GtkAdjustment:lower to * #GtkAdjustment:upper - #GtkAdjustment:page_size. */ void gtk_adjustment_set_value (GtkAdjustment *adjustment, gdouble value) { g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); gtk_adjustment_set_value_internal (adjustment, value, FALSE); } void gtk_adjustment_animate_to_value (GtkAdjustment *adjustment, gdouble value) { g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); gtk_adjustment_set_value_internal (adjustment, value, TRUE); } /** * gtk_adjustment_get_lower: * @adjustment: a #GtkAdjustment * * Retrieves the minimum value of the adjustment. * * Returns: The current minimum value of the adjustment. * * Since: 2.14 **/ gdouble gtk_adjustment_get_lower (GtkAdjustment *adjustment) { g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0); return adjustment->priv->lower; } /** * gtk_adjustment_set_lower: * @adjustment: a #GtkAdjustment * @lower: the new minimum value * * Sets the minimum value of the adjustment. * * When setting multiple adjustment properties via their individual * setters, multiple #GtkAdjustment::changed signals will be emitted. However, since * the emission of the #GtkAdjustment::changed signal is tied to the emission of the * #GObject::notify signals of the changed properties, it’s possible * to compress the #GtkAdjustment::changed signals into one by calling * g_object_freeze_notify() and g_object_thaw_notify() around the * calls to the individual setters. * * Alternatively, using a single g_object_set() for all the properties * to change, or using gtk_adjustment_configure() has the same effect * of compressing #GtkAdjustment::changed emissions. * * Since: 2.14 **/ void gtk_adjustment_set_lower (GtkAdjustment *adjustment, gdouble lower) { g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); if (lower != adjustment->priv->lower) g_object_set (adjustment, "lower", lower, NULL); } /** * gtk_adjustment_get_upper: * @adjustment: a #GtkAdjustment * * Retrieves the maximum value of the adjustment. * * Returns: The current maximum value of the adjustment. * * Since: 2.14 **/ gdouble gtk_adjustment_get_upper (GtkAdjustment *adjustment) { g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0); return adjustment->priv->upper; } /** * gtk_adjustment_set_upper: * @adjustment: a #GtkAdjustment * @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 gtk_adjustment_set_lower() about how to compress multiple * emissions of the #GtkAdjustment::changed signal when setting multiple adjustment * properties. * * Since: 2.14 **/ void gtk_adjustment_set_upper (GtkAdjustment *adjustment, gdouble upper) { g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); if (upper != adjustment->priv->upper) g_object_set (adjustment, "upper", upper, NULL); } /** * gtk_adjustment_get_step_increment: * @adjustment: a #GtkAdjustment * * Retrieves the step increment of the adjustment. * * Returns: The current step increment of the adjustment. * * Since: 2.14 **/ gdouble gtk_adjustment_get_step_increment (GtkAdjustment *adjustment) { g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0); return adjustment->priv->step_increment; } /** * gtk_adjustment_set_step_increment: * @adjustment: a #GtkAdjustment * @step_increment: the new step increment * * Sets the step increment of the adjustment. * * See gtk_adjustment_set_lower() about how to compress multiple * emissions of the #GtkAdjustment::changed signal when setting multiple adjustment * properties. * * Since: 2.14 **/ void gtk_adjustment_set_step_increment (GtkAdjustment *adjustment, gdouble step_increment) { g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); if (step_increment != adjustment->priv->step_increment) g_object_set (adjustment, "step-increment", step_increment, NULL); } /** * gtk_adjustment_get_page_increment: * @adjustment: a #GtkAdjustment * * Retrieves the page increment of the adjustment. * * Returns: The current page increment of the adjustment. * * Since: 2.14 **/ gdouble gtk_adjustment_get_page_increment (GtkAdjustment *adjustment) { g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0); return adjustment->priv->page_increment; } /** * gtk_adjustment_set_page_increment: * @adjustment: a #GtkAdjustment * @page_increment: the new page increment * * Sets the page increment of the adjustment. * * See gtk_adjustment_set_lower() about how to compress multiple * emissions of the #GtkAdjustment::changed signal when setting multiple adjustment * properties. * * Since: 2.14 **/ void gtk_adjustment_set_page_increment (GtkAdjustment *adjustment, gdouble page_increment) { g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); if (page_increment != adjustment->priv->page_increment) g_object_set (adjustment, "page-increment", page_increment, NULL); } /** * gtk_adjustment_get_page_size: * @adjustment: a #GtkAdjustment * * Retrieves the page size of the adjustment. * * Returns: The current page size of the adjustment. * * Since: 2.14 **/ gdouble gtk_adjustment_get_page_size (GtkAdjustment *adjustment) { g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0); return adjustment->priv->page_size; } /** * gtk_adjustment_set_page_size: * @adjustment: a #GtkAdjustment * @page_size: the new page size * * Sets the page size of the adjustment. * * See gtk_adjustment_set_lower() about how to compress multiple * emissions of the GtkAdjustment::changed signal when setting multiple adjustment * properties. * * Since: 2.14 **/ void gtk_adjustment_set_page_size (GtkAdjustment *adjustment, gdouble page_size) { g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); if (page_size != adjustment->priv->page_size) g_object_set (adjustment, "page-size", page_size, NULL); } /** * gtk_adjustment_configure: * @adjustment: a #GtkAdjustment * @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 #GtkAdjustment::changed * signal. See gtk_adjustment_set_lower() for an alternative way * of compressing multiple emissions of #GtkAdjustment::changed into one. * * Since: 2.14 **/ void gtk_adjustment_configure (GtkAdjustment *adjustment, gdouble value, gdouble lower, gdouble upper, gdouble step_increment, gdouble page_increment, gdouble page_size) { GtkAdjustmentPrivate *priv; gboolean value_changed = FALSE; guint64 old_stamp = adjustment_changed_stamp; g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); priv = adjustment->priv; g_object_freeze_notify (G_OBJECT (adjustment)); g_object_set (adjustment, "lower", lower, "upper", upper, "step-increment", step_increment, "page-increment", page_increment, "page-size", page_size, NULL); /* don't use CLAMP() so we don't end up below lower if upper - page_size * is smaller than lower */ value = MIN (value, upper - page_size); value = MAX (value, lower); if (value != priv->value) { /* set value manually to make sure "changed" is emitted with the * new value in place and is emitted before "value-changed" */ priv->value = value; value_changed = TRUE; } g_object_thaw_notify (G_OBJECT (adjustment)); if (old_stamp == adjustment_changed_stamp) gtk_adjustment_changed (adjustment); /* force emission before ::value-changed */ if (value_changed) gtk_adjustment_value_changed (adjustment); } /** * gtk_adjustment_changed: * @adjustment: a #GtkAdjustment * * Emits a #GtkAdjustment::changed signal from the #GtkAdjustment. * This is typically called by the owner of the #GtkAdjustment after it has * changed any of the #GtkAdjustment properties other than the value. */ void gtk_adjustment_changed (GtkAdjustment *adjustment) { g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); g_signal_emit (adjustment, adjustment_signals[CHANGED], 0); } /** * gtk_adjustment_value_changed: * @adjustment: a #GtkAdjustment * * Emits a #GtkAdjustment::value_changed signal from the #GtkAdjustment. * This is typically called by the owner of the #GtkAdjustment after it has * changed the #GtkAdjustment:value property. */ void gtk_adjustment_value_changed (GtkAdjustment *adjustment) { g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); g_signal_emit (adjustment, adjustment_signals[VALUE_CHANGED], 0); g_object_notify (G_OBJECT (adjustment), "value"); } /** * gtk_adjustment_clamp_page: * @adjustment: a #GtkAdjustment. * @lower: the lower value. * @upper: the upper value. * * Updates the #GtkAdjustment:value property to ensure that the range * between @lower and @upper is in the current page (i.e. between * #GtkAdjustment:value and #GtkAdjustment:value + #GtkAdjustment:page_size). * If the range is larger than the page size, then only the start of it will * be in the current page. * A #GtkAdjustment::changed signal will be emitted if the value is changed. */ void gtk_adjustment_clamp_page (GtkAdjustment *adjustment, gdouble lower, gdouble upper) { GtkAdjustmentPrivate *priv; gboolean need_emission; g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); priv = adjustment->priv; lower = CLAMP (lower, priv->lower, priv->upper); upper = CLAMP (upper, priv->lower, priv->upper); need_emission = FALSE; if (priv->value + priv->page_size < upper) { priv->value = upper - priv->page_size; need_emission = TRUE; } if (priv->value > lower) { priv->value = lower; need_emission = TRUE; } if (need_emission) gtk_adjustment_value_changed (adjustment); } /** * gtk_adjustment_get_minimum_increment: * @adjustment: a #GtkAdjustment * * Gets the smaller of step increment and page increment. * * Returns: the minimum increment of @adjustment * * Since: 3.2 */ gdouble gtk_adjustment_get_minimum_increment (GtkAdjustment *adjustment) { GtkAdjustmentPrivate *priv; gdouble minimum_increment; g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0); priv = adjustment->priv; if (priv->step_increment != 0 && priv->page_increment != 0) { if (ABS (priv->step_increment) < ABS (priv->page_increment)) minimum_increment = priv->step_increment; else minimum_increment = priv->page_increment; } else if (priv->step_increment == 0 && priv->page_increment == 0) { minimum_increment = 0; } else if (priv->step_increment == 0) { minimum_increment = priv->page_increment; } else { minimum_increment = priv->step_increment; } return minimum_increment; } void gtk_adjustment_enable_animation (GtkAdjustment *adjustment, GdkFrameClock *clock, guint duration) { GtkAdjustmentPrivate *priv = adjustment->priv; if (priv->clock != clock) { if (priv->tick_id) { adjustment_set_value (adjustment, priv->target); g_signal_handler_disconnect (priv->clock, priv->tick_id); priv->tick_id = 0; gdk_frame_clock_end_updating (priv->clock); } if (priv->clock) g_object_unref (priv->clock); priv->clock = clock; if (priv->clock) g_object_ref (priv->clock); } priv->duration = duration; } guint gtk_adjustment_get_animation_duration (GtkAdjustment *adjustment) { return adjustment->priv->duration; } gboolean gtk_adjustment_is_animating (GtkAdjustment *adjustment) { return adjustment->priv->tick_id != 0; }