/* 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 "gtkadjustmentprivate.h" #include "gtkmarshalers.h" #include "gtkprivate.h" #include "gtkintl.h" /** * GtkAdjustment: * * `GtkAdjustment` is a model for a numeric value. * * The `GtkAdjustment has an associated lower and upper bound. * It also contains step and page increments, and a page size. * * Adjustments are used within several GTK widgets, including * [class@Gtk.SpinButton], [class@Gtk.Viewport], [class@Gtk.Scrollbar] * and [class@Gtk.Scale]. * * The `GtkAdjustment` object does not update the value itself. Instead * it is left up to the owner of the `GtkAdjustment` to control the value. */ struct _GtkAdjustmentPrivate { double lower; double upper; double value; double step_increment; double page_increment; double page_size; double source; double target; guint duration; guint tick_id; gint64 start_time; gint64 end_time; GdkFrameClock *clock; }; typedef struct _GtkAdjustmentPrivate GtkAdjustmentPrivate; enum { PROP_0, PROP_VALUE, PROP_LOWER, PROP_UPPER, PROP_STEP_INCREMENT, PROP_PAGE_INCREMENT, PROP_PAGE_SIZE, NUM_PROPERTIES }; 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 GParamSpec *adjustment_props[NUM_PROPERTIES] = { NULL, }; 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 = gtk_adjustment_get_instance_private (adjustment); 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: (attributes org.gtk.Property.get=gtk_adjustment_get_value org.gtk.Property.set=gtk_adjustment_set_value) * * The value of the adjustment. */ adjustment_props[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: (attributes org.gtk.Property.get=gtk_adjustment_get_lower org.gtk.Property.set=gtk_adjustment_set_lower) * * The minimum value of the adjustment. */ adjustment_props[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: (attributes org.gtk.Property.get=gtk_adjustment_get_upper org.gtk.Property.set=gtk_adjustment_set_upper) * * The maximum value of the adjustment. * * Note that values will be restricted by `upper - page-size` if the page-size * property is nonzero. */ adjustment_props[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: (attributes org.gtk.Property.get=gtk_adjustment_get_step_increment org.gtk.Property.set=gtk_adjustment_set_step_increment) * * The step increment of the adjustment. */ adjustment_props[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: (attributes org.gtk.Property.get=gtk_adjustment_get_page_increment org.gtk.Property.set=gtk_adjustment_set_page_increment) * * The page increment of the adjustment. */ adjustment_props[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: (attributes org.gtk.Property.get=gtk_adjustment_get_page_size org.gtk.Property.set=gtk_adjustment_set_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`. */ adjustment_props[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); g_object_class_install_properties (gobject_class, NUM_PROPERTIES, adjustment_props); /** * GtkAdjustment::changed: * @adjustment: the object which received the signal * * Emitted when one or more of the `GtkAdjustment` properties have been * changed. * * Note that the [property@Gtk.Adjustment:value] property is * covered by the [signal@Gtk.Adjustment::value-changed] signal. */ 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, NULL, G_TYPE_NONE, 0); /** * GtkAdjustment::value-changed: * @adjustment: the object which received the signal * * Emitted when the value 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, NULL, G_TYPE_NONE, 0); } static void gtk_adjustment_init (GtkAdjustment *adjustment) { } static void gtk_adjustment_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) { GtkAdjustment *adjustment = GTK_ADJUSTMENT (object); GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); 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); double double_value = g_value_get_double (value); switch (prop_id) { case PROP_VALUE: gtk_adjustment_set_value (adjustment, double_value); break; case PROP_LOWER: gtk_adjustment_set_lower (adjustment, double_value); break; case PROP_UPPER: gtk_adjustment_set_upper (adjustment, double_value); break; case PROP_STEP_INCREMENT: gtk_adjustment_set_step_increment (adjustment, double_value); break; case PROP_PAGE_INCREMENT: gtk_adjustment_set_page_increment (adjustment, double_value); break; case PROP_PAGE_SIZE: gtk_adjustment_set_page_size (adjustment, double_value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static inline void emit_value_changed (GtkAdjustment *adjustment) { g_signal_emit (adjustment, adjustment_signals[VALUE_CHANGED], 0); g_object_notify_by_pspec (G_OBJECT (adjustment), adjustment_props[PROP_VALUE]); } static void gtk_adjustment_dispatch_properties_changed (GObject *object, guint n_pspecs, GParamSpec **pspecs) { gboolean changed = FALSE; int 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) { g_signal_emit (object, adjustment_signals[CHANGED], 0); } } /** * 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 (double value, double lower, double upper, double step_increment, double page_increment, double 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: (attributes org.gtk.Method.get_property=value) * @adjustment: a `GtkAdjustment` * * Gets the current value of the adjustment. * * Returns: The current value of the adjustment */ double gtk_adjustment_get_value (GtkAdjustment *adjustment) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0); return priv->value; } double gtk_adjustment_get_target_value (GtkAdjustment *adjustment) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0); if (priv->tick_id) return priv->target; else return priv->value; } static void adjustment_set_value (GtkAdjustment *adjustment, double value) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); if (priv->value != value) { priv->value = value; emit_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 = gtk_adjustment_get_instance_private (adjustment); 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 = gtk_adjustment_get_instance_private (adjustment); 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 double ease_out_cubic (double t) { double p = t - 1; return p * p * p + 1; } static void gtk_adjustment_on_frame_clock_update (GdkFrameClock *clock, GtkAdjustment *adjustment) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); gint64 now; now = gdk_frame_clock_get_frame_time (clock); if (now < priv->end_time) { double t; t = (now - priv->start_time) / (double) (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, double value, gboolean animate) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); /* 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->tick_id && 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: (attributes org.gtk.Method.set_property=value) * @adjustment: a `GtkAdjustment` * @value: the new value * * Sets the `GtkAdjustment` value. * * The value is clamped to lie between [property@Gtk.Adjustment:lower] * and [property@Gtk.Adjustment:upper]. * * Note that for adjustments which are used in a `GtkScrollbar`, * the effective range of allowed values goes from * [property@Gtk.Adjustment:lower] to * [property@Gtk.Adjustment:upper] - [property@Gtk.Adjustment:page-size]. */ void gtk_adjustment_set_value (GtkAdjustment *adjustment, double 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, double value) { g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); gtk_adjustment_set_value_internal (adjustment, value, TRUE); } /** * gtk_adjustment_get_lower: (attributes org.gtk.Method.get_property=lower) * @adjustment: a `GtkAdjustment` * * Retrieves the minimum value of the adjustment. * * Returns: The current minimum value of the adjustment **/ double gtk_adjustment_get_lower (GtkAdjustment *adjustment) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0); return priv->lower; } /** * gtk_adjustment_set_lower: (attributes org.gtk.Method.set_property=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 [signal@Gtk.Adjustment::changed] signals will * be emitted. However, since the emission of the * [signal@Gtk.Adjustment::changed] signal is tied to the emission * of the ::notify signals of the changed properties, it’s possible * to compress the [signal@Gtk.Adjustment::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 [method@Gtk.Adjustment.configure] has the same effect. */ void gtk_adjustment_set_lower (GtkAdjustment *adjustment, double lower) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); if (lower != priv->lower) { priv->lower = lower; g_object_notify_by_pspec (G_OBJECT (adjustment), adjustment_props[PROP_LOWER]); } } /** * gtk_adjustment_get_upper: (attributes org.gtk.Method.get_property=upper) * @adjustment: a `GtkAdjustment` * * Retrieves the maximum value of the adjustment. * * Returns: The current maximum value of the adjustment */ double gtk_adjustment_get_upper (GtkAdjustment *adjustment) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0); return priv->upper; } /** * gtk_adjustment_set_upper: (attributes org.gtk.Method.set_property=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 [method@Gtk.Adjustment.set_lower] about how to compress * multiple emissions of the [signal@Gtk.Adjustment::changed] * signal when setting multiple adjustment properties. */ void gtk_adjustment_set_upper (GtkAdjustment *adjustment, double upper) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); if (upper != priv->upper) { priv->upper = upper; g_object_notify_by_pspec (G_OBJECT (adjustment), adjustment_props[PROP_UPPER]); } } /** * gtk_adjustment_get_step_increment: (attributes org.gtk.Method.get_property=step-increment) * @adjustment: a `GtkAdjustment` * * Retrieves the step increment of the adjustment. * * Returns: The current step increment of the adjustment. */ double gtk_adjustment_get_step_increment (GtkAdjustment *adjustment) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0); return priv->step_increment; } /** * gtk_adjustment_set_step_increment: (attributes org.gtk.Method.set_property=step-increment) * @adjustment: a `GtkAdjustment` * @step_increment: the new step increment * * Sets the step increment of the adjustment. * * See [method@Gtk.Adjustment.set_lower] about how to compress * multiple emissions of the [signal@Gtk.Adjustment::changed] * signal when setting multiple adjustment properties. */ void gtk_adjustment_set_step_increment (GtkAdjustment *adjustment, double step_increment) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); if (step_increment != priv->step_increment) { priv->step_increment = step_increment; g_object_notify_by_pspec (G_OBJECT (adjustment), adjustment_props[PROP_STEP_INCREMENT]); } } /** * gtk_adjustment_get_page_increment: (attributes org.gtk.Method.get_property=page-increment) * @adjustment: a `GtkAdjustment` * * Retrieves the page increment of the adjustment. * * Returns: The current page increment of the adjustment **/ double gtk_adjustment_get_page_increment (GtkAdjustment *adjustment) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0); return priv->page_increment; } /** * gtk_adjustment_set_page_increment: (attributes org.gtk.Method.set_property=page-increment) * @adjustment: a `GtkAdjustment` * @page_increment: the new page increment * * Sets the page increment of the adjustment. * * See [method@Gtk.Adjustment.set_lower] about how to compress * multiple emissions of the [signal@Gtk.Adjustment::changed] * signal when setting multiple adjustment properties. */ void gtk_adjustment_set_page_increment (GtkAdjustment *adjustment, double page_increment) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); if (page_increment != priv->page_increment) { priv->page_increment = page_increment; g_object_notify_by_pspec (G_OBJECT (adjustment), adjustment_props[PROP_PAGE_INCREMENT]); } } /** * gtk_adjustment_get_page_size: (attributes org.gtk.Method.get_property=page-size) * @adjustment: a `GtkAdjustment` * * Retrieves the page size of the adjustment. * * Returns: The current page size of the adjustment **/ double gtk_adjustment_get_page_size (GtkAdjustment *adjustment) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0.0); return priv->page_size; } /** * gtk_adjustment_set_page_size: (attributes org.gtk.Method.set_property=page-size) * @adjustment: a `GtkAdjustment` * @page_size: the new page size * * Sets the page size of the adjustment. * * See [method@Gtk.Adjustment.set_lower] about how to compress * multiple emissions of the [signal@Gtk.Adjustment::changed] * signal when setting multiple adjustment properties. */ void gtk_adjustment_set_page_size (GtkAdjustment *adjustment, double page_size) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); if (page_size != priv->page_size) { priv->page_size = page_size; g_object_notify_by_pspec (G_OBJECT (adjustment), adjustment_props[PROP_PAGE_SIZE]); } } /** * 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 * [signal@Gtk.Adjustment::changed] signal. See * [method@Gtk.Adjustment.set_lower] for an alternative * way of compressing multiple emissions of * [signal@Gtk.Adjustment::changed] into one. */ void gtk_adjustment_configure (GtkAdjustment *adjustment, double value, double lower, double upper, double step_increment, double page_increment, double page_size) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); gboolean value_changed = FALSE; g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); g_object_freeze_notify (G_OBJECT (adjustment)); gtk_adjustment_set_lower (adjustment, lower); gtk_adjustment_set_upper (adjustment, upper); gtk_adjustment_set_step_increment (adjustment, step_increment); gtk_adjustment_set_page_increment (adjustment, page_increment); gtk_adjustment_set_page_size (adjustment, page_size); /* 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; } /* The dispatch_properties_changed implementation will emit ::changed! */ g_object_thaw_notify (G_OBJECT (adjustment)); if (value_changed) emit_value_changed (adjustment); } /** * gtk_adjustment_clamp_page: * @adjustment: a `GtkAdjustment` * @lower: the lower value * @upper: the upper value * * Updates the value property to ensure that the range * between @lower and @upper is in the current page. * * The current page goes from `value` to `value` + `page-size`. * If the range is larger than the page size, then only the * start of it will be in the current page. * * A [signal@Gtk.Adjustment::value-changed] signal will be emitted * if the value is changed. */ void gtk_adjustment_clamp_page (GtkAdjustment *adjustment, double lower, double upper) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); gboolean need_emission; g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment)); 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) emit_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 */ double gtk_adjustment_get_minimum_increment (GtkAdjustment *adjustment) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); double minimum_increment; g_return_val_if_fail (GTK_IS_ADJUSTMENT (adjustment), 0); 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 = gtk_adjustment_get_instance_private (adjustment); 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) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); return priv->duration; } gboolean gtk_adjustment_is_animating (GtkAdjustment *adjustment) { GtkAdjustmentPrivate *priv = gtk_adjustment_get_instance_private (adjustment); return priv->tick_id != 0; }