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0f851be368
gtk2/gtk/gtkstack.c
Matthias Clasen 0f851be368 Fix a doc comment typo
2015-08-09 23:32:04 +02:00

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/*
* Copyright (c) 2013 Red Hat, Inc.
*
* This program 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 program 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 program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author: Alexander Larsson <alexl@redhat.com>
*
*/
#include "config.h"
#include <gtk/gtk.h>
#include "gtkstack.h"
#include "gtkprivate.h"
#include "gtkintl.h"
#include <math.h>
#include <string.h>
/**
* SECTION:gtkstack
* @Short_description: A stacking container
* @Title: GtkStack
* @See_also: #GtkNotebook, #GtkStackSwitcher
*
* The GtkStack widget is a container which only shows
* one of its children at a time. In contrast to GtkNotebook,
* GtkStack does not provide a means for users to change the
* visible child. Instead, the #GtkStackSwitcher widget can be
* used with GtkStack to provide this functionality.
*
* Transitions between pages can be animated as slides or
* fades. This can be controlled with gtk_stack_set_transition_type().
* These animations respect the #GtkSettings:gtk-enable-animations
* setting.
*
* The GtkStack widget was added in GTK+ 3.10.
*/
/**
* GtkStackTransitionType:
* @GTK_STACK_TRANSITION_TYPE_NONE: No transition
* @GTK_STACK_TRANSITION_TYPE_CROSSFADE: A cross-fade
* @GTK_STACK_TRANSITION_TYPE_SLIDE_RIGHT: Slide from left to right
* @GTK_STACK_TRANSITION_TYPE_SLIDE_LEFT: Slide from right to left
* @GTK_STACK_TRANSITION_TYPE_SLIDE_UP: Slide from bottom up
* @GTK_STACK_TRANSITION_TYPE_SLIDE_DOWN: Slide from top down
* @GTK_STACK_TRANSITION_TYPE_SLIDE_LEFT_RIGHT: Slide from left or right according to the children order
* @GTK_STACK_TRANSITION_TYPE_SLIDE_UP_DOWN: Slide from top down or bottom up according to the order
* @GTK_STACK_TRANSITION_TYPE_OVER_UP: Cover the old page by sliding up. Since 3.12
* @GTK_STACK_TRANSITION_TYPE_OVER_DOWN: Cover the old page by sliding down. Since: 3.12
* @GTK_STACK_TRANSITION_TYPE_OVER_LEFT: Cover the old page by sliding to the left. Since: 3.12
* @GTK_STACK_TRANSITION_TYPE_OVER_RIGHT: Cover the old page by sliding to the right. Since: 3.12
* @GTK_STACK_TRANSITION_TYPE_UNDER_UP: Uncover the new page by sliding up. Since 3.12
* @GTK_STACK_TRANSITION_TYPE_UNDER_DOWN: Uncover the new page by sliding down. Since: 3.12
* @GTK_STACK_TRANSITION_TYPE_UNDER_LEFT: Uncover the new page by sliding to the left. Since: 3.12
* @GTK_STACK_TRANSITION_TYPE_UNDER_RIGHT: Uncover the new page by sliding to the right. Since: 3.12
* @GTK_STACK_TRANSITION_TYPE_OVER_UP_DOWN: Cover the old page sliding up or uncover the new page sliding down, according to order. Since: 3.12
* @GTK_STACK_TRANSITION_TYPE_OVER_DOWN_UP: Cover the old page sliding down or uncover the new page sliding up, according to order. Since: 3.14
* @GTK_STACK_TRANSITION_TYPE_OVER_LEFT_RIGHT: Cover the old page sliding left or uncover the new page sliding right, according to order. Since: 3.14
* @GTK_STACK_TRANSITION_TYPE_OVER_RIGHT_LEFT: Cover the old page sliding right or uncover the new page sliding left, according to order. Since: 3.14
*
* These enumeration values describe the possible transitions
* between pages in a #GtkStack widget.
*
* New values may be added to this enumeration over time.
*/
/* TODO:
* filter events out events to the last_child widget during transitions
*/
enum {
PROP_0,
PROP_HOMOGENEOUS,
PROP_HHOMOGENEOUS,
PROP_VHOMOGENEOUS,
PROP_VISIBLE_CHILD,
PROP_VISIBLE_CHILD_NAME,
PROP_TRANSITION_DURATION,
PROP_TRANSITION_TYPE,
PROP_TRANSITION_RUNNING,
PROP_INTERPOLATE_SIZE,
LAST_PROP
};
enum
{
CHILD_PROP_0,
CHILD_PROP_NAME,
CHILD_PROP_TITLE,
CHILD_PROP_ICON_NAME,
CHILD_PROP_POSITION,
CHILD_PROP_NEEDS_ATTENTION
};
typedef struct _GtkStackChildInfo GtkStackChildInfo;
struct _GtkStackChildInfo {
GtkWidget *widget;
gchar *name;
gchar *title;
gchar *icon_name;
gboolean needs_attention;
GtkWidget *last_focus;
};
typedef struct {
GList *children;
GdkWindow* bin_window;
GdkWindow* view_window;
GtkStackChildInfo *visible_child;
gboolean hhomogeneous;
gboolean vhomogeneous;
GtkStackTransitionType transition_type;
guint transition_duration;
GtkStackChildInfo *last_visible_child;
cairo_surface_t *last_visible_surface;
GtkAllocation last_visible_surface_allocation;
gdouble transition_pos;
guint tick_id;
gint64 start_time;
gint64 end_time;
gint last_visible_widget_width;
gint last_visible_widget_height;
gboolean interpolate_size;
GtkStackTransitionType active_transition_type;
} GtkStackPrivate;
static GParamSpec *stack_props[LAST_PROP] = { NULL, };
static void gtk_stack_add (GtkContainer *widget,
GtkWidget *child);
static void gtk_stack_remove (GtkContainer *widget,
GtkWidget *child);
static void gtk_stack_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data);
static void gtk_stack_compute_expand (GtkWidget *widget,
gboolean *hexpand,
gboolean *vexpand);
static void gtk_stack_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gtk_stack_draw (GtkWidget *widget,
cairo_t *cr);
static void gtk_stack_get_preferred_height (GtkWidget *widget,
gint *minimum_height,
gint *natural_height);
static void gtk_stack_get_preferred_height_for_width (GtkWidget *widget,
gint width,
gint *minimum_height,
gint *natural_height);
static void gtk_stack_get_preferred_width (GtkWidget *widget,
gint *minimum_width,
gint *natural_width);
static void gtk_stack_get_preferred_width_for_height (GtkWidget *widget,
gint height,
gint *minimum_width,
gint *natural_width);
static void gtk_stack_finalize (GObject *obj);
static void gtk_stack_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gtk_stack_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_stack_get_child_property (GtkContainer *container,
GtkWidget *child,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gtk_stack_set_child_property (GtkContainer *container,
GtkWidget *child,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_stack_unschedule_ticks (GtkStack *stack);
static gint get_bin_window_x (GtkStack *stack,
GtkAllocation *allocation);
static gint get_bin_window_y (GtkStack *stack,
GtkAllocation *allocation);
G_DEFINE_TYPE_WITH_PRIVATE (GtkStack, gtk_stack, GTK_TYPE_CONTAINER)
static void
gtk_stack_init (GtkStack *stack)
{
}
static void
gtk_stack_dispose (GObject *obj)
{
GtkStack *stack = GTK_STACK (obj);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
priv->visible_child = NULL;
G_OBJECT_CLASS (gtk_stack_parent_class)->dispose (obj);
}
static void
gtk_stack_finalize (GObject *obj)
{
GtkStack *stack = GTK_STACK (obj);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
gtk_stack_unschedule_ticks (stack);
if (priv->last_visible_surface != NULL)
cairo_surface_destroy (priv->last_visible_surface);
G_OBJECT_CLASS (gtk_stack_parent_class)->finalize (obj);
}
static void
gtk_stack_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GtkStack *stack = GTK_STACK (object);
switch (property_id)
{
case PROP_HOMOGENEOUS:
g_value_set_boolean (value, gtk_stack_get_homogeneous (stack));
break;
case PROP_HHOMOGENEOUS:
g_value_set_boolean (value, gtk_stack_get_hhomogeneous (stack));
break;
case PROP_VHOMOGENEOUS:
g_value_set_boolean (value, gtk_stack_get_vhomogeneous (stack));
break;
case PROP_VISIBLE_CHILD:
g_value_set_object (value, gtk_stack_get_visible_child (stack));
break;
case PROP_VISIBLE_CHILD_NAME:
g_value_set_string (value, gtk_stack_get_visible_child_name (stack));
break;
case PROP_TRANSITION_DURATION:
g_value_set_uint (value, gtk_stack_get_transition_duration (stack));
break;
case PROP_TRANSITION_TYPE:
g_value_set_enum (value, gtk_stack_get_transition_type (stack));
break;
case PROP_TRANSITION_RUNNING:
g_value_set_boolean (value, gtk_stack_get_transition_running (stack));
break;
case PROP_INTERPOLATE_SIZE:
g_value_set_boolean (value, gtk_stack_get_interpolate_size (stack));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gtk_stack_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GtkStack *stack = GTK_STACK (object);
switch (property_id)
{
case PROP_HOMOGENEOUS:
gtk_stack_set_homogeneous (stack, g_value_get_boolean (value));
break;
case PROP_HHOMOGENEOUS:
gtk_stack_set_hhomogeneous (stack, g_value_get_boolean (value));
break;
case PROP_VHOMOGENEOUS:
gtk_stack_set_vhomogeneous (stack, g_value_get_boolean (value));
break;
case PROP_VISIBLE_CHILD:
gtk_stack_set_visible_child (stack, g_value_get_object (value));
break;
case PROP_VISIBLE_CHILD_NAME:
gtk_stack_set_visible_child_name (stack, g_value_get_string (value));
break;
case PROP_TRANSITION_DURATION:
gtk_stack_set_transition_duration (stack, g_value_get_uint (value));
break;
case PROP_TRANSITION_TYPE:
gtk_stack_set_transition_type (stack, g_value_get_enum (value));
break;
case PROP_INTERPOLATE_SIZE:
gtk_stack_set_interpolate_size (stack, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gtk_stack_realize (GtkWidget *widget)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkAllocation allocation;
GdkWindowAttr attributes = { 0 };
GdkWindowAttributesType attributes_mask;
GtkStackChildInfo *info;
GList *l;
gtk_widget_set_realized (widget, TRUE);
gtk_widget_get_allocation (widget, &allocation);
attributes.x = allocation.x;
attributes.y = allocation.y;
attributes.width = allocation.width;
attributes.height = allocation.height;
attributes.window_type = GDK_WINDOW_CHILD;
attributes.wclass = GDK_INPUT_OUTPUT;
attributes.visual = gtk_widget_get_visual (widget);
attributes.event_mask =
gtk_widget_get_events (widget) | GDK_EXPOSURE_MASK;
attributes_mask = (GDK_WA_X | GDK_WA_Y) | GDK_WA_VISUAL;
priv->view_window =
gdk_window_new (gtk_widget_get_parent_window ((GtkWidget*) stack),
&attributes, attributes_mask);
gtk_widget_set_window (widget, priv->view_window);
gtk_widget_register_window (widget, priv->view_window);
attributes.x = get_bin_window_x (stack, &allocation);
attributes.y = 0;
attributes.width = allocation.width;
attributes.height = allocation.height;
for (l = priv->children; l != NULL; l = l->next)
{
info = l->data;
attributes.event_mask |= gtk_widget_get_events (info->widget);
}
priv->bin_window =
gdk_window_new (priv->view_window, &attributes, attributes_mask);
gtk_widget_register_window (widget, priv->bin_window);
for (l = priv->children; l != NULL; l = l->next)
{
info = l->data;
gtk_widget_set_parent_window (info->widget, priv->bin_window);
}
gdk_window_show (priv->bin_window);
}
static void
gtk_stack_unrealize (GtkWidget *widget)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
gtk_widget_unregister_window (widget, priv->bin_window);
gdk_window_destroy (priv->bin_window);
priv->view_window = NULL;
GTK_WIDGET_CLASS (gtk_stack_parent_class)->unrealize (widget);
}
static void
gtk_stack_class_init (GtkStackClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
object_class->get_property = gtk_stack_get_property;
object_class->set_property = gtk_stack_set_property;
object_class->dispose = gtk_stack_dispose;
object_class->finalize = gtk_stack_finalize;
widget_class->size_allocate = gtk_stack_size_allocate;
widget_class->draw = gtk_stack_draw;
widget_class->realize = gtk_stack_realize;
widget_class->unrealize = gtk_stack_unrealize;
widget_class->get_preferred_height = gtk_stack_get_preferred_height;
widget_class->get_preferred_height_for_width = gtk_stack_get_preferred_height_for_width;
widget_class->get_preferred_width = gtk_stack_get_preferred_width;
widget_class->get_preferred_width_for_height = gtk_stack_get_preferred_width_for_height;
widget_class->compute_expand = gtk_stack_compute_expand;
container_class->add = gtk_stack_add;
container_class->remove = gtk_stack_remove;
container_class->forall = gtk_stack_forall;
container_class->set_child_property = gtk_stack_set_child_property;
container_class->get_child_property = gtk_stack_get_child_property;
gtk_container_class_handle_border_width (container_class);
stack_props[PROP_HOMOGENEOUS] =
g_param_spec_boolean ("homogeneous", P_("Homogeneous"), P_("Homogeneous sizing"),
TRUE,
GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkStack:hhomogeneous:
*
* %TRUE if the stack allocates the same width for all children.
*
* Since: 3.16
*/
stack_props[PROP_HHOMOGENEOUS] =
g_param_spec_boolean ("hhomogeneous", P_("Horizontally homogeneous"), P_("Horizontally homogeneous sizing"),
TRUE,
GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkStack:vhomogeneous:
*
* %TRUE if the stack allocates the same height for all children.
*
* Since: 3.16
*/
stack_props[PROP_VHOMOGENEOUS] =
g_param_spec_boolean ("vhomogeneous", P_("Vertically homogeneous"), P_("Vertically homogeneous sizing"),
TRUE,
GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_EXPLICIT_NOTIFY);
stack_props[PROP_VISIBLE_CHILD] =
g_param_spec_object ("visible-child", P_("Visible child"), P_("The widget currently visible in the stack"),
GTK_TYPE_WIDGET,
GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
stack_props[PROP_VISIBLE_CHILD_NAME] =
g_param_spec_string ("visible-child-name", P_("Name of visible child"), P_("The name of the widget currently visible in the stack"),
NULL,
GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
stack_props[PROP_TRANSITION_DURATION] =
g_param_spec_uint ("transition-duration", P_("Transition duration"), P_("The animation duration, in milliseconds"),
0, G_MAXUINT, 200,
GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_EXPLICIT_NOTIFY);
stack_props[PROP_TRANSITION_TYPE] =
g_param_spec_enum ("transition-type", P_("Transition type"), P_("The type of animation used to transition"),
GTK_TYPE_STACK_TRANSITION_TYPE, GTK_STACK_TRANSITION_TYPE_NONE,
GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_EXPLICIT_NOTIFY);
stack_props[PROP_TRANSITION_RUNNING] =
g_param_spec_boolean ("transition-running", P_("Transition running"), P_("Whether or not the transition is currently running"),
FALSE,
GTK_PARAM_READABLE);
stack_props[PROP_INTERPOLATE_SIZE] =
g_param_spec_boolean ("interpolate-size", P_("Interpolate size"), P_("Whether or not the size should smoothly change when changing between differently sized children"),
FALSE,
GTK_PARAM_READABLE);
g_object_class_install_properties (object_class, LAST_PROP, stack_props);
gtk_container_class_install_child_property (container_class, CHILD_PROP_NAME,
g_param_spec_string ("name",
P_("Name"),
P_("The name of the child page"),
NULL,
GTK_PARAM_READWRITE));
gtk_container_class_install_child_property (container_class, CHILD_PROP_TITLE,
g_param_spec_string ("title",
P_("Title"),
P_("The title of the child page"),
NULL,
GTK_PARAM_READWRITE));
gtk_container_class_install_child_property (container_class, CHILD_PROP_ICON_NAME,
g_param_spec_string ("icon-name",
P_("Icon name"),
P_("The icon name of the child page"),
NULL,
GTK_PARAM_READWRITE));
gtk_container_class_install_child_property (container_class, CHILD_PROP_POSITION,
g_param_spec_int ("position",
P_("Position"),
P_("The index of the child in the parent"),
-1, G_MAXINT, 0,
GTK_PARAM_READWRITE));
/**
* GtkStack:needs-attention:
*
* Sets a flag specifying whether the child requires the user attention.
* This is used by the #GtkStackSwitcher to change the appearance of the
* corresponding button when a page needs attention and it is not the
* current one.
*
* Since: 3.12
*/
gtk_container_class_install_child_property (container_class, CHILD_PROP_NEEDS_ATTENTION,
g_param_spec_boolean ("needs-attention",
P_("Needs Attention"),
P_("Whether this page needs attention"),
FALSE,
GTK_PARAM_READWRITE));
}
/**
* gtk_stack_new:
*
* Creates a new #GtkStack container.
*
* Returns: a new #GtkStack
*
* Since: 3.10
*/
GtkWidget *
gtk_stack_new (void)
{
return g_object_new (GTK_TYPE_STACK, NULL);
}
static GtkStackChildInfo *
find_child_info_for_widget (GtkStack *stack,
GtkWidget *child)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkStackChildInfo *info;
GList *l;
for (l = priv->children; l != NULL; l = l->next)
{
info = l->data;
if (info->widget == child)
return info;
}
return NULL;
}
static void
reorder_child (GtkStack *stack,
GtkWidget *child,
gint position)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GList *l;
GList *old_link = NULL;
GList *new_link = NULL;
GtkStackChildInfo *child_info = NULL;
gint num = 0;
l = priv->children;
/* Loop to find the old position and link of child, new link of child and
* total number of children. new_link will be NULL if the child should be
* moved to the end (in case of position being < 0 || >= num)
*/
while (l && (new_link == NULL || old_link == NULL))
{
/* Record the new position if found */
if (position == num)
new_link = l;
if (old_link == NULL)
{
GtkStackChildInfo *info;
info = l->data;
/* Keep trying to find the current position and link location of the child */
if (info->widget == child)
{
old_link = l;
child_info = info;
}
}
l = l->next;
num++;
}
g_return_if_fail (old_link != NULL);
if (old_link == new_link || (old_link->next == NULL && new_link == NULL))
return;
priv->children = g_list_delete_link (priv->children, old_link);
priv->children = g_list_insert_before (priv->children, new_link, child_info);
gtk_widget_child_notify (child, "position");
}
static void
gtk_stack_get_child_property (GtkContainer *container,
GtkWidget *child,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GtkStack *stack = GTK_STACK (container);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkStackChildInfo *info;
info = find_child_info_for_widget (stack, child);
if (info == NULL)
{
GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
return;
}
switch (property_id)
{
case CHILD_PROP_NAME:
g_value_set_string (value, info->name);
break;
case CHILD_PROP_TITLE:
g_value_set_string (value, info->title);
break;
case CHILD_PROP_ICON_NAME:
g_value_set_string (value, info->icon_name);
break;
case CHILD_PROP_POSITION:
g_value_set_int (value, g_list_index (priv->children, info));
break;
case CHILD_PROP_NEEDS_ATTENTION:
g_value_set_boolean (value, info->needs_attention);
break;
default:
GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
break;
}
}
static void
gtk_stack_set_child_property (GtkContainer *container,
GtkWidget *child,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GtkStack *stack = GTK_STACK (container);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkStackChildInfo *info;
GtkStackChildInfo *info2;
gchar *name;
GList *l;
info = find_child_info_for_widget (stack, child);
if (info == NULL)
{
GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
return;
}
switch (property_id)
{
case CHILD_PROP_NAME:
name = g_value_dup_string (value);
for (l = priv->children; l != NULL; l = l->next)
{
info2 = l->data;
if (info == info2)
continue;
if (g_strcmp0 (info2->name, name) == 0)
{
g_warning ("Duplicate child name in GtkStack: %s\n", name);
break;
}
}
g_free (info->name);
info->name = name;
gtk_container_child_notify (container, child, "name");
if (priv->visible_child == info)
g_object_notify_by_pspec (G_OBJECT (stack),
stack_props[PROP_VISIBLE_CHILD_NAME]);
break;
case CHILD_PROP_TITLE:
g_free (info->title);
info->title = g_value_dup_string (value);
gtk_container_child_notify (container, child, "title");
break;
case CHILD_PROP_ICON_NAME:
g_free (info->icon_name);
info->icon_name = g_value_dup_string (value);
gtk_container_child_notify (container, child, "icon-name");
break;
case CHILD_PROP_POSITION:
reorder_child (stack, child, g_value_get_int (value));
break;
case CHILD_PROP_NEEDS_ATTENTION:
info->needs_attention = g_value_get_boolean (value);
gtk_container_child_notify (container, child, "needs-attention");
break;
default:
GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
break;
}
}
/* 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 inline gboolean
is_left_transition (GtkStackTransitionType transition_type)
{
return (transition_type == GTK_STACK_TRANSITION_TYPE_SLIDE_LEFT ||
transition_type == GTK_STACK_TRANSITION_TYPE_OVER_LEFT);
}
static inline gboolean
is_right_transition (GtkStackTransitionType transition_type)
{
return (transition_type == GTK_STACK_TRANSITION_TYPE_SLIDE_RIGHT ||
transition_type == GTK_STACK_TRANSITION_TYPE_OVER_RIGHT);
}
static inline gboolean
is_up_transition (GtkStackTransitionType transition_type)
{
return (transition_type == GTK_STACK_TRANSITION_TYPE_SLIDE_UP ||
transition_type == GTK_STACK_TRANSITION_TYPE_OVER_UP);
}
static inline gboolean
is_down_transition (GtkStackTransitionType transition_type)
{
return (transition_type == GTK_STACK_TRANSITION_TYPE_SLIDE_DOWN ||
transition_type == GTK_STACK_TRANSITION_TYPE_OVER_DOWN);
}
/* Transitions that cause the bin window to move */
static inline gboolean
is_window_moving_transition (GtkStackTransitionType transition_type)
{
return (transition_type == GTK_STACK_TRANSITION_TYPE_SLIDE_LEFT ||
transition_type == GTK_STACK_TRANSITION_TYPE_SLIDE_RIGHT ||
transition_type == GTK_STACK_TRANSITION_TYPE_SLIDE_UP ||
transition_type == GTK_STACK_TRANSITION_TYPE_SLIDE_DOWN ||
transition_type == GTK_STACK_TRANSITION_TYPE_OVER_UP ||
transition_type == GTK_STACK_TRANSITION_TYPE_OVER_DOWN ||
transition_type == GTK_STACK_TRANSITION_TYPE_OVER_LEFT ||
transition_type == GTK_STACK_TRANSITION_TYPE_OVER_RIGHT);
}
/* Transitions that change direction depending on the relative order of the
old and new child */
static inline gboolean
is_direction_dependent_transition (GtkStackTransitionType transition_type)
{
return (transition_type == GTK_STACK_TRANSITION_TYPE_SLIDE_LEFT_RIGHT ||
transition_type == GTK_STACK_TRANSITION_TYPE_SLIDE_UP_DOWN ||
transition_type == GTK_STACK_TRANSITION_TYPE_OVER_UP_DOWN ||
transition_type == GTK_STACK_TRANSITION_TYPE_OVER_DOWN_UP ||
transition_type == GTK_STACK_TRANSITION_TYPE_OVER_LEFT_RIGHT ||
transition_type == GTK_STACK_TRANSITION_TYPE_OVER_RIGHT_LEFT);
}
/* Returns simple transition type for a direction dependent transition, given
whether the new child (the one being switched to) is first in the stacking order
(added earlier). */
static inline GtkStackTransitionType
get_simple_transition_type (gboolean new_child_first,
GtkStackTransitionType transition_type)
{
switch (transition_type)
{
case GTK_STACK_TRANSITION_TYPE_SLIDE_LEFT_RIGHT:
return new_child_first ? GTK_STACK_TRANSITION_TYPE_SLIDE_RIGHT : GTK_STACK_TRANSITION_TYPE_SLIDE_LEFT;
case GTK_STACK_TRANSITION_TYPE_SLIDE_UP_DOWN:
return new_child_first ? GTK_STACK_TRANSITION_TYPE_SLIDE_DOWN : GTK_STACK_TRANSITION_TYPE_SLIDE_UP;
case GTK_STACK_TRANSITION_TYPE_OVER_UP_DOWN:
return new_child_first ? GTK_STACK_TRANSITION_TYPE_UNDER_DOWN : GTK_STACK_TRANSITION_TYPE_OVER_UP;
case GTK_STACK_TRANSITION_TYPE_OVER_DOWN_UP:
return new_child_first ? GTK_STACK_TRANSITION_TYPE_UNDER_UP : GTK_STACK_TRANSITION_TYPE_OVER_DOWN;
case GTK_STACK_TRANSITION_TYPE_OVER_LEFT_RIGHT:
return new_child_first ? GTK_STACK_TRANSITION_TYPE_UNDER_RIGHT : GTK_STACK_TRANSITION_TYPE_OVER_LEFT;
case GTK_STACK_TRANSITION_TYPE_OVER_RIGHT_LEFT:
return new_child_first ? GTK_STACK_TRANSITION_TYPE_UNDER_LEFT : GTK_STACK_TRANSITION_TYPE_OVER_RIGHT;
default: ;
}
return transition_type;
}
static gint
get_bin_window_x (GtkStack *stack,
GtkAllocation *allocation)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
int x = 0;
if (priv->transition_pos < 1.0)
{
if (is_left_transition (priv->active_transition_type))
x = allocation->width * (1 - ease_out_cubic (priv->transition_pos));
if (is_right_transition (priv->active_transition_type))
x = -allocation->width * (1 - ease_out_cubic (priv->transition_pos));
}
return x;
}
static gint
get_bin_window_y (GtkStack *stack,
GtkAllocation *allocation)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
int y = 0;
if (priv->transition_pos < 1.0)
{
if (is_up_transition (priv->active_transition_type))
y = allocation->height * (1 - ease_out_cubic (priv->transition_pos));
if (is_down_transition(priv->active_transition_type))
y = -allocation->height * (1 - ease_out_cubic (priv->transition_pos));
}
return y;
}
static gboolean
gtk_stack_set_transition_position (GtkStack *stack,
gdouble pos)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
gboolean done;
priv->transition_pos = pos;
gtk_widget_queue_draw (GTK_WIDGET (stack));
if (!priv->vhomogeneous || !priv->hhomogeneous)
gtk_widget_queue_resize (GTK_WIDGET (stack));
if (priv->bin_window != NULL &&
is_window_moving_transition (priv->active_transition_type))
{
GtkAllocation allocation;
gtk_widget_get_allocation (GTK_WIDGET (stack), &allocation);
gdk_window_move (priv->bin_window,
get_bin_window_x (stack, &allocation), get_bin_window_y (stack, &allocation));
}
done = pos >= 1.0;
if (done)
{
if (priv->last_visible_surface != NULL)
{
cairo_surface_destroy (priv->last_visible_surface);
priv->last_visible_surface = NULL;
}
if (priv->last_visible_child != NULL)
{
gtk_widget_set_child_visible (priv->last_visible_child->widget, FALSE);
priv->last_visible_child = NULL;
}
gtk_widget_queue_resize (GTK_WIDGET (stack));
}
return done;
}
static gboolean
gtk_stack_transition_cb (GtkWidget *widget,
GdkFrameClock *frame_clock,
gpointer user_data)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
gint64 now;
gdouble t;
now = gdk_frame_clock_get_frame_time (frame_clock);
t = 1.0;
if (now < priv->end_time)
t = (now - priv->start_time) / (double) (priv->end_time - priv->start_time);
/* Finish animation early if not mapped anymore */
if (!gtk_widget_get_mapped (widget))
t = 1.0;
if (gtk_stack_set_transition_position (stack, t))
{
priv->tick_id = 0;
g_object_notify_by_pspec (G_OBJECT (stack), stack_props[PROP_TRANSITION_RUNNING]);
return FALSE;
}
return TRUE;
}
static void
gtk_stack_schedule_ticks (GtkStack *stack)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
if (priv->tick_id == 0)
{
priv->tick_id =
gtk_widget_add_tick_callback (GTK_WIDGET (stack), gtk_stack_transition_cb, stack, NULL);
g_object_notify_by_pspec (G_OBJECT (stack), stack_props[PROP_TRANSITION_RUNNING]);
}
}
static void
gtk_stack_unschedule_ticks (GtkStack *stack)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
if (priv->tick_id != 0)
{
gtk_widget_remove_tick_callback (GTK_WIDGET (stack), priv->tick_id);
priv->tick_id = 0;
g_object_notify_by_pspec (G_OBJECT (stack), stack_props[PROP_TRANSITION_RUNNING]);
}
}
static GtkStackTransitionType
effective_transition_type (GtkStack *stack,
GtkStackTransitionType transition_type)
{
if (gtk_widget_get_direction (GTK_WIDGET (stack)) == GTK_TEXT_DIR_RTL)
{
switch (transition_type)
{
case GTK_STACK_TRANSITION_TYPE_SLIDE_LEFT:
return GTK_STACK_TRANSITION_TYPE_SLIDE_RIGHT;
case GTK_STACK_TRANSITION_TYPE_SLIDE_RIGHT:
return GTK_STACK_TRANSITION_TYPE_SLIDE_LEFT;
case GTK_STACK_TRANSITION_TYPE_OVER_LEFT:
return GTK_STACK_TRANSITION_TYPE_OVER_RIGHT;
case GTK_STACK_TRANSITION_TYPE_OVER_RIGHT:
return GTK_STACK_TRANSITION_TYPE_OVER_LEFT;
case GTK_STACK_TRANSITION_TYPE_UNDER_LEFT:
return GTK_STACK_TRANSITION_TYPE_UNDER_RIGHT;
case GTK_STACK_TRANSITION_TYPE_UNDER_RIGHT:
return GTK_STACK_TRANSITION_TYPE_UNDER_LEFT;
default: ;
}
}
return transition_type;
}
static void
gtk_stack_start_transition (GtkStack *stack,
GtkStackTransitionType transition_type,
guint transition_duration)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkWidget *widget = GTK_WIDGET (stack);
gboolean animations_enabled;
g_object_get (gtk_widget_get_settings (widget),
"gtk-enable-animations", &animations_enabled,
NULL);
if (gtk_widget_get_mapped (widget) &&
animations_enabled &&
transition_type != GTK_STACK_TRANSITION_TYPE_NONE &&
transition_duration != 0 &&
priv->last_visible_child != NULL)
{
priv->transition_pos = 0.0;
priv->start_time = gdk_frame_clock_get_frame_time (gtk_widget_get_frame_clock (widget));
priv->end_time = priv->start_time + (transition_duration * 1000);
priv->active_transition_type = effective_transition_type (stack, transition_type);
gtk_stack_schedule_ticks (stack);
}
else
{
gtk_stack_unschedule_ticks (stack);
priv->active_transition_type = GTK_STACK_TRANSITION_TYPE_NONE;
gtk_stack_set_transition_position (stack, 1.0);
}
}
static void
set_visible_child (GtkStack *stack,
GtkStackChildInfo *child_info,
GtkStackTransitionType transition_type,
guint transition_duration)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkStackChildInfo *info;
GtkWidget *widget = GTK_WIDGET (stack);
GList *l;
GtkWidget *toplevel;
GtkWidget *focus;
gboolean contains_focus = FALSE;
/* if we are being destroyed, do not bother with transitions
* and notifications
*/
if (gtk_widget_in_destruction (widget))
return;
/* If none, pick first visible */
if (child_info == NULL)
{
for (l = priv->children; l != NULL; l = l->next)
{
info = l->data;
if (gtk_widget_get_visible (info->widget))
{
child_info = info;
break;
}
}
}
if (child_info == priv->visible_child)
return;
toplevel = gtk_widget_get_toplevel (widget);
if (GTK_IS_WINDOW (toplevel))
{
focus = gtk_window_get_focus (GTK_WINDOW (toplevel));
if (focus &&
priv->visible_child &&
priv->visible_child->widget &&
gtk_widget_is_ancestor (focus, priv->visible_child->widget))
{
contains_focus = TRUE;
if (priv->visible_child->last_focus)
g_object_remove_weak_pointer (G_OBJECT (priv->visible_child->last_focus),
(gpointer *)&priv->visible_child->last_focus);
priv->visible_child->last_focus = focus;
g_object_add_weak_pointer (G_OBJECT (priv->visible_child->last_focus),
(gpointer *)&priv->visible_child->last_focus);
}
}
if (priv->last_visible_child)
gtk_widget_set_child_visible (priv->last_visible_child->widget, FALSE);
priv->last_visible_child = NULL;
if (priv->last_visible_surface != NULL)
cairo_surface_destroy (priv->last_visible_surface);
priv->last_visible_surface = NULL;
if (priv->visible_child && priv->visible_child->widget)
{
if (gtk_widget_is_visible (widget))
{
int fake;
priv->last_visible_child = priv->visible_child;
gtk_widget_get_preferred_width (priv->last_visible_child->widget,
&fake,
&priv->last_visible_widget_width);
gtk_widget_get_preferred_height (priv->last_visible_child->widget,
&fake,
&priv->last_visible_widget_height);
}
else
{
gtk_widget_set_child_visible (priv->visible_child->widget, FALSE);
}
}
priv->visible_child = child_info;
if (child_info)
{
gtk_widget_set_child_visible (child_info->widget, TRUE);
if (contains_focus)
{
if (child_info->last_focus)
gtk_widget_grab_focus (child_info->last_focus);
else
gtk_widget_child_focus (child_info->widget, GTK_DIR_TAB_FORWARD);
}
}
if ((child_info == NULL || priv->last_visible_child == NULL) &&
is_direction_dependent_transition (transition_type))
{
transition_type = GTK_STACK_TRANSITION_TYPE_NONE;
}
else if (is_direction_dependent_transition (transition_type))
{
gboolean i_first = FALSE;
for (l = priv->children; l != NULL; l = l->next)
{
if (child_info == l->data)
{
i_first = TRUE;
break;
}
if (priv->last_visible_child == l->data)
break;
}
transition_type = get_simple_transition_type (i_first, transition_type);
}
g_object_notify_by_pspec (G_OBJECT (stack), stack_props[PROP_VISIBLE_CHILD]);
g_object_notify_by_pspec (G_OBJECT (stack),
stack_props[PROP_VISIBLE_CHILD_NAME]);
gtk_stack_start_transition (stack, transition_type, transition_duration);
}
static void
stack_child_visibility_notify_cb (GObject *obj,
GParamSpec *pspec,
gpointer user_data)
{
GtkStack *stack = GTK_STACK (user_data);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkWidget *child = GTK_WIDGET (obj);
GtkStackChildInfo *child_info;
child_info = find_child_info_for_widget (stack, child);
if (priv->visible_child == NULL &&
gtk_widget_get_visible (child))
set_visible_child (stack, child_info, priv->transition_type, priv->transition_duration);
else if (priv->visible_child == child_info &&
!gtk_widget_get_visible (child))
set_visible_child (stack, NULL, priv->transition_type, priv->transition_duration);
if (child_info == priv->last_visible_child)
{
gtk_widget_set_child_visible (priv->last_visible_child->widget, FALSE);
priv->last_visible_child = NULL;
}
}
/**
* gtk_stack_add_titled:
* @stack: a #GtkStack
* @child: the widget to add
* @name: the name for @child
* @title: a human-readable title for @child
*
* Adds a child to @stack.
* The child is identified by the @name. The @title
* will be used by #GtkStackSwitcher to represent
* @child in a tab bar, so it should be short.
*
* Since: 3.10
*/
void
gtk_stack_add_titled (GtkStack *stack,
GtkWidget *child,
const gchar *name,
const gchar *title)
{
g_return_if_fail (GTK_IS_STACK (stack));
g_return_if_fail (GTK_IS_WIDGET (child));
gtk_container_add_with_properties (GTK_CONTAINER (stack),
child,
"name", name,
"title", title,
NULL);
}
/**
* gtk_stack_add_named:
* @stack: a #GtkStack
* @child: the widget to add
* @name: the name for @child
*
* Adds a child to @stack.
* The child is identified by the @name.
*
* Since: 3.10
*/
void
gtk_stack_add_named (GtkStack *stack,
GtkWidget *child,
const gchar *name)
{
g_return_if_fail (GTK_IS_STACK (stack));
g_return_if_fail (GTK_IS_WIDGET (child));
gtk_container_add_with_properties (GTK_CONTAINER (stack),
child,
"name", name,
NULL);
}
static void
gtk_stack_add (GtkContainer *container,
GtkWidget *child)
{
GtkStack *stack = GTK_STACK (container);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkStackChildInfo *child_info;
g_return_if_fail (child != NULL);
child_info = g_slice_new (GtkStackChildInfo);
child_info->widget = child;
child_info->name = NULL;
child_info->title = NULL;
child_info->icon_name = NULL;
child_info->needs_attention = FALSE;
child_info->last_focus = NULL;
priv->children = g_list_append (priv->children, child_info);
gtk_widget_set_parent_window (child, priv->bin_window);
gtk_widget_set_parent (child, GTK_WIDGET (stack));
if (priv->bin_window)
gdk_window_set_events (priv->bin_window,
gdk_window_get_events (priv->bin_window) |
gtk_widget_get_events (child));
g_signal_connect (child, "notify::visible",
G_CALLBACK (stack_child_visibility_notify_cb), stack);
gtk_widget_child_notify (child, "position");
if (priv->visible_child == NULL &&
gtk_widget_get_visible (child))
set_visible_child (stack, child_info, priv->transition_type, priv->transition_duration);
else
gtk_widget_set_child_visible (child, FALSE);
if (priv->hhomogeneous || priv->vhomogeneous || priv->visible_child == child_info)
gtk_widget_queue_resize (GTK_WIDGET (stack));
}
static void
gtk_stack_remove (GtkContainer *container,
GtkWidget *child)
{
GtkStack *stack = GTK_STACK (container);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkStackChildInfo *child_info;
gboolean was_visible;
child_info = find_child_info_for_widget (stack, child);
if (child_info == NULL)
return;
priv->children = g_list_remove (priv->children, child_info);
g_signal_handlers_disconnect_by_func (child,
stack_child_visibility_notify_cb,
stack);
was_visible = gtk_widget_get_visible (child);
child_info->widget = NULL;
if (priv->visible_child == child_info)
set_visible_child (stack, NULL, priv->transition_type, priv->transition_duration);
if (priv->last_visible_child == child_info)
priv->last_visible_child = NULL;
gtk_widget_unparent (child);
g_free (child_info->name);
g_free (child_info->title);
g_free (child_info->icon_name);
if (child_info->last_focus)
g_object_remove_weak_pointer (G_OBJECT (child_info->last_focus),
(gpointer *)&child_info->last_focus);
g_slice_free (GtkStackChildInfo, child_info);
if ((priv->hhomogeneous || priv->vhomogeneous) && was_visible)
gtk_widget_queue_resize (GTK_WIDGET (stack));
}
/**
* gtk_stack_get_child_by_name:
* @stack: a #GtkStack
* @name: the name of the child to find
*
* Finds the child of the #GtkStack with the name given as
* the argument. Returns %NULL if there is no child with this
* name.
*
* Returns: (transfer none): the requested child of the #GtkStack
*
* Since: 3.12
*/
GtkWidget *
gtk_stack_get_child_by_name (GtkStack *stack,
const gchar *name)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkStackChildInfo *info;
GList *l;
g_return_val_if_fail (GTK_IS_STACK (stack), NULL);
g_return_val_if_fail (name != NULL, NULL);
for (l = priv->children; l != NULL; l = l->next)
{
info = l->data;
if (info->name && strcmp (info->name, name) == 0)
return info->widget;
}
return NULL;
}
/**
* gtk_stack_set_homogeneous:
* @stack: a #GtkStack
* @homogeneous: %TRUE to make @stack homogeneous
*
* Sets the #GtkStack to be homogeneous or not. If it
* is homogeneous, the #GtkStack will request the same
* size for all its children. If it isn't, the stack
* may change size when a different child becomes visible.
*
* Since 3.16, homogeneity can be controlled separately
* for horizontal and vertical size, with the
* #GtkStack:hhomogeneous and #GtkStack:vhomogeneous.
*
* Since: 3.10
*/
void
gtk_stack_set_homogeneous (GtkStack *stack,
gboolean homogeneous)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
g_return_if_fail (GTK_IS_STACK (stack));
homogeneous = !!homogeneous;
if ((priv->hhomogeneous && priv->vhomogeneous) == homogeneous)
return;
g_object_freeze_notify (G_OBJECT (stack));
if (priv->hhomogeneous != homogeneous)
{
priv->hhomogeneous = homogeneous;
g_object_notify_by_pspec (G_OBJECT (stack), stack_props[PROP_HHOMOGENEOUS]);
}
if (priv->vhomogeneous != homogeneous)
{
priv->vhomogeneous = homogeneous;
g_object_notify_by_pspec (G_OBJECT (stack), stack_props[PROP_VHOMOGENEOUS]);
}
if (gtk_widget_get_visible (GTK_WIDGET(stack)))
gtk_widget_queue_resize (GTK_WIDGET (stack));
g_object_notify_by_pspec (G_OBJECT (stack), stack_props[PROP_HOMOGENEOUS]);
g_object_thaw_notify (G_OBJECT (stack));
}
/**
* gtk_stack_get_homogeneous:
* @stack: a #GtkStack
*
* Gets whether @stack is homogeneous.
* See gtk_stack_set_homogeneous().
*
* Returns: whether @stack is homogeneous.
*
* Since: 3.10
*/
gboolean
gtk_stack_get_homogeneous (GtkStack *stack)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
g_return_val_if_fail (GTK_IS_STACK (stack), FALSE);
return priv->hhomogeneous && priv->vhomogeneous;
}
/**
* gtk_stack_set_hhomogeneous:
* @stack: a #GtkStack
* @hhomogeneous: %TRUE to make @stack horizontally homogeneous
*
* Sets the #GtkStack to be horizontally homogeneous or not.
* If it is homogeneous, the #GtkStack will request the same
* width for all its children. If it isn't, the stack
* may change width when a different child becomes visible.
*
* Since: 3.16
*/
void
gtk_stack_set_hhomogeneous (GtkStack *stack,
gboolean hhomogeneous)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
g_return_if_fail (GTK_IS_STACK (stack));
hhomogeneous = !!hhomogeneous;
if (priv->hhomogeneous == hhomogeneous)
return;
priv->hhomogeneous = hhomogeneous;
if (gtk_widget_get_visible (GTK_WIDGET(stack)))
gtk_widget_queue_resize (GTK_WIDGET (stack));
g_object_notify_by_pspec (G_OBJECT (stack), stack_props[PROP_HHOMOGENEOUS]);
}
/**
* gtk_stack_get_hhomogeneous:
* @stack: a #GtkStack
*
* Gets whether @stack is horizontally homogeneous.
* See gtk_stack_set_hhomogeneous().
*
* Returns: whether @stack is horizontally homogeneous.
*
* Since: 3.16
*/
gboolean
gtk_stack_get_hhomogeneous (GtkStack *stack)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
g_return_val_if_fail (GTK_IS_STACK (stack), FALSE);
return priv->hhomogeneous;
}
/**
* gtk_stack_set_vhomogeneous:
* @stack: a #GtkStack
* @vhomogeneous: %TRUE to make @stack vertically homogeneous
*
* Sets the #GtkStack to be vertically homogeneous or not.
* If it is homogeneous, the #GtkStack will request the same
* height for all its children. If it isn't, the stack
* may change height when a different child becomes visible.
*
* Since: 3.16
*/
void
gtk_stack_set_vhomogeneous (GtkStack *stack,
gboolean vhomogeneous)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
g_return_if_fail (GTK_IS_STACK (stack));
vhomogeneous = !!vhomogeneous;
if (priv->vhomogeneous == vhomogeneous)
return;
priv->vhomogeneous = vhomogeneous;
if (gtk_widget_get_visible (GTK_WIDGET(stack)))
gtk_widget_queue_resize (GTK_WIDGET (stack));
g_object_notify_by_pspec (G_OBJECT (stack), stack_props[PROP_VHOMOGENEOUS]);
}
/**
* gtk_stack_get_vhomogeneous:
* @stack: a #GtkStack
*
* Gets whether @stack is vertically homogeneous.
* See gtk_stack_set_vhomogeneous().
*
* Returns: whether @stack is vertically homogeneous.
*
* Since: 3.16
*/
gboolean
gtk_stack_get_vhomogeneous (GtkStack *stack)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
g_return_val_if_fail (GTK_IS_STACK (stack), FALSE);
return priv->vhomogeneous;
}
/**
* gtk_stack_get_transition_duration:
* @stack: a #GtkStack
*
* Returns the amount of time (in milliseconds) that
* transitions between pages in @stack will take.
*
* Returns: the transition duration
*
* Since: 3.10
*/
guint
gtk_stack_get_transition_duration (GtkStack *stack)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
g_return_val_if_fail (GTK_IS_STACK (stack), 0);
return priv->transition_duration;
}
/**
* gtk_stack_set_transition_duration:
* @stack: a #GtkStack
* @duration: the new duration, in milliseconds
*
* Sets the duration that transitions between pages in @stack
* will take.
*
* Since: 3.10
*/
void
gtk_stack_set_transition_duration (GtkStack *stack,
guint duration)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
g_return_if_fail (GTK_IS_STACK (stack));
if (priv->transition_duration == duration)
return;
priv->transition_duration = duration;
g_object_notify_by_pspec (G_OBJECT (stack),
stack_props[PROP_TRANSITION_DURATION]);
}
/**
* gtk_stack_get_transition_type:
* @stack: a #GtkStack
*
* Gets the type of animation that will be used
* for transitions between pages in @stack.
*
* Returns: the current transition type of @stack
*
* Since: 3.10
*/
GtkStackTransitionType
gtk_stack_get_transition_type (GtkStack *stack)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
g_return_val_if_fail (GTK_IS_STACK (stack), GTK_STACK_TRANSITION_TYPE_NONE);
return priv->transition_type;
}
/**
* gtk_stack_set_transition_type:
* @stack: a #GtkStack
* @transition: the new transition type
*
* Sets the type of animation that will be used for
* transitions between pages in @stack. Available
* types include various kinds of fades and slides.
*
* The transition type can be changed without problems
* at runtime, so it is possible to change the animation
* based on the page that is about to become current.
*
* Since: 3.10
*/
void
gtk_stack_set_transition_type (GtkStack *stack,
GtkStackTransitionType transition)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
g_return_if_fail (GTK_IS_STACK (stack));
if (priv->transition_type == transition)
return;
priv->transition_type = transition;
g_object_notify_by_pspec (G_OBJECT (stack),
stack_props[PROP_TRANSITION_TYPE]);
}
/**
* gtk_stack_get_transition_running:
* @stack: a #GtkStack
*
* Returns whether the @stack is currently in a transition from one page to
* another.
*
* Returns: %TRUE if the transition is currently running, %FALSE otherwise.
*
* Since: 3.12
*/
gboolean
gtk_stack_get_transition_running (GtkStack *stack)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
g_return_val_if_fail (GTK_IS_STACK (stack), FALSE);
return (priv->tick_id != 0);
}
/**
* gtk_stack_set_interpolate_size:
* @stack: A #GtkStack
* @interpolate_size: the new value
*
* Sets whether or not @stack will interpolate its size when
* changing the visible child. If the interpolate-size property
* is set to %TRUE, @stack will interpolate its size between
* the current one and the one it'll take after changing the visible-child,
* according to the set transition-duration.
*
* Since: 3.18
*/
void
gtk_stack_set_interpolate_size (GtkStack *stack,
gboolean interpolate_size)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
g_return_if_fail (GTK_IS_STACK (stack));
interpolate_size = !!interpolate_size;
if (priv->interpolate_size == interpolate_size)
return;
priv->interpolate_size = interpolate_size;
g_object_notify_by_pspec (G_OBJECT (stack),
stack_props[PROP_INTERPOLATE_SIZE]);
}
/**
* gtk_stack_get_interpolate_size:
* @stack: A #GtkStack
*
* Returns: %TRUE If the #GtkStack is set up to interpolate between
* visible-child sizes, %FALSE otherwise.
*
* Since: 3.18
*/
gboolean
gtk_stack_get_interpolate_size (GtkStack *stack)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
g_return_val_if_fail (GTK_IS_STACK (stack), FALSE);
return priv->interpolate_size;
}
/**
* gtk_stack_get_visible_child:
* @stack: a #GtkStack
*
* Gets the currently visible child of @stack, or %NULL if
* there are no visible children.
*
* Returns: (transfer none): the visible child of the #GtkStack
*
* Since: 3.10
*/
GtkWidget *
gtk_stack_get_visible_child (GtkStack *stack)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
g_return_val_if_fail (GTK_IS_STACK (stack), NULL);
return priv->visible_child ? priv->visible_child->widget : NULL;
}
/**
* gtk_stack_get_visible_child_name:
* @stack: a #GtkStack
*
* Returns the name of the currently visible child of @stack, or
* %NULL if there is no visible child.
*
* Returns: (transfer none): the name of the visible child of the #GtkStack
*
* Since: 3.10
*/
const gchar *
gtk_stack_get_visible_child_name (GtkStack *stack)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
g_return_val_if_fail (GTK_IS_STACK (stack), NULL);
if (priv->visible_child)
return priv->visible_child->name;
return NULL;
}
/**
* gtk_stack_set_visible_child:
* @stack: a #GtkStack
* @child: a child of @stack
*
* Makes @child the visible child of @stack.
*
* If @child is different from the currently
* visible child, the transition between the
* two will be animated with the current
* transition type of @stack.
*
* Note that the @child widget has to be visible itself
* (see gtk_widget_show()) in order to become the visible
* child of @stack.
*
* Since: 3.10
*/
void
gtk_stack_set_visible_child (GtkStack *stack,
GtkWidget *child)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkStackChildInfo *child_info;
g_return_if_fail (GTK_IS_STACK (stack));
g_return_if_fail (GTK_IS_WIDGET (child));
child_info = find_child_info_for_widget (stack, child);
if (child_info == NULL)
{
g_warning ("Given child of type '%s' not found in GtkStack",
G_OBJECT_TYPE_NAME (child));
return;
}
if (gtk_widget_get_visible (child_info->widget))
set_visible_child (stack, child_info,
priv->transition_type,
priv->transition_duration);
}
/**
* gtk_stack_set_visible_child_name:
* @stack: a #GtkStack
* @name: the name of the child to make visible
*
* Makes the child with the given name visible.
*
* If @child is different from the currently
* visible child, the transition between the
* two will be animated with the current
* transition type of @stack.
*
* Note that the child widget has to be visible itself
* (see gtk_widget_show()) in order to become the visible
* child of @stack.
*
* Since: 3.10
*/
void
gtk_stack_set_visible_child_name (GtkStack *stack,
const gchar *name)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
gtk_stack_set_visible_child_full (stack, name, priv->transition_type);
}
/**
* gtk_stack_set_visible_child_full:
* @stack: a #GtkStack
* @name: the name of the child to make visible
* @transition: the transition type to use
*
* Makes the child with the given name visible.
*
* Note that the child widget has to be visible itself
* (see gtk_widget_show()) in order to become the visible
* child of @stack.
*
* Since: 3.10
*/
void
gtk_stack_set_visible_child_full (GtkStack *stack,
const gchar *name,
GtkStackTransitionType transition)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkStackChildInfo *child_info, *info;
GList *l;
g_return_if_fail (GTK_IS_STACK (stack));
if (name == NULL)
return;
child_info = NULL;
for (l = priv->children; l != NULL; l = l->next)
{
info = l->data;
if (info->name != NULL &&
strcmp (info->name, name) == 0)
{
child_info = info;
break;
}
}
if (child_info == NULL)
{
g_warning ("Child name '%s' not found in GtkStack", name);
return;
}
if (gtk_widget_get_visible (child_info->widget))
set_visible_child (stack, child_info, transition, priv->transition_duration);
}
static void
gtk_stack_forall (GtkContainer *container,
gboolean include_internals,
GtkCallback callback,
gpointer callback_data)
{
GtkStack *stack = GTK_STACK (container);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkStackChildInfo *child_info;
GList *l;
l = priv->children;
while (l)
{
child_info = l->data;
l = l->next;
(* callback) (child_info->widget, callback_data);
}
}
static void
gtk_stack_compute_expand (GtkWidget *widget,
gboolean *hexpand_p,
gboolean *vexpand_p)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
gboolean hexpand, vexpand;
GtkStackChildInfo *child_info;
GtkWidget *child;
GList *l;
hexpand = FALSE;
vexpand = FALSE;
for (l = priv->children; l != NULL; l = l->next)
{
child_info = l->data;
child = child_info->widget;
if (!hexpand &&
gtk_widget_compute_expand (child, GTK_ORIENTATION_HORIZONTAL))
hexpand = TRUE;
if (!vexpand &&
gtk_widget_compute_expand (child, GTK_ORIENTATION_VERTICAL))
vexpand = TRUE;
if (hexpand && vexpand)
break;
}
*hexpand_p = hexpand;
*vexpand_p = vexpand;
}
static void
gtk_stack_draw_crossfade (GtkWidget *widget,
cairo_t *cr)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
cairo_push_group (cr);
gtk_container_propagate_draw (GTK_CONTAINER (stack),
priv->visible_child->widget,
cr);
cairo_save (cr);
/* Multiply alpha by transition pos */
cairo_set_source_rgba (cr, 1, 1, 1, priv->transition_pos);
cairo_set_operator (cr, CAIRO_OPERATOR_DEST_IN);
cairo_paint (cr);
if (priv->last_visible_surface)
{
cairo_set_source_surface (cr, priv->last_visible_surface,
priv->last_visible_surface_allocation.x,
priv->last_visible_surface_allocation.y);
cairo_set_operator (cr, CAIRO_OPERATOR_ADD);
cairo_paint_with_alpha (cr, MAX (1.0 - priv->transition_pos, 0));
}
cairo_restore (cr);
cairo_pop_group_to_source (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
cairo_paint (cr);
}
static void
gtk_stack_draw_under (GtkWidget *widget,
cairo_t *cr)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkAllocation allocation;
gint x, y, width, height, pos_x, pos_y;
gtk_widget_get_allocation (widget, &allocation);
x = y = 0;
width = allocation.width;
height = allocation.height;
pos_x = pos_y = 0;
switch (priv->active_transition_type)
{
case GTK_STACK_TRANSITION_TYPE_UNDER_DOWN:
y = 0;
height = allocation.height * (ease_out_cubic (priv->transition_pos));
pos_y = height;
break;
case GTK_STACK_TRANSITION_TYPE_UNDER_UP:
y = allocation.height * (1 - ease_out_cubic (priv->transition_pos));
height = allocation.height - y;
pos_y = y - allocation.height;
break;
case GTK_STACK_TRANSITION_TYPE_UNDER_LEFT:
x = allocation.width * (1 - ease_out_cubic (priv->transition_pos));
width = allocation.width - x;
pos_x = x - allocation.width;
break;
case GTK_STACK_TRANSITION_TYPE_UNDER_RIGHT:
x = 0;
width = allocation.width * (ease_out_cubic (priv->transition_pos));
pos_x = width;
break;
default:
g_assert_not_reached ();
}
cairo_save (cr);
cairo_rectangle (cr, x, y, width, height);
cairo_clip (cr);
gtk_container_propagate_draw (GTK_CONTAINER (stack),
priv->visible_child->widget,
cr);
cairo_restore (cr);
if (priv->last_visible_surface)
{
cairo_set_source_surface (cr, priv->last_visible_surface, pos_x, pos_y);
cairo_paint (cr);
}
}
static void
gtk_stack_draw_slide (GtkWidget *widget,
cairo_t *cr)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
if (priv->last_visible_surface &&
gtk_cairo_should_draw_window (cr, priv->view_window))
{
GtkAllocation allocation;
int x, y;
gtk_widget_get_allocation (widget, &allocation);
x = get_bin_window_x (stack, &allocation);
y = get_bin_window_y (stack, &allocation);
switch (priv->active_transition_type)
{
case GTK_STACK_TRANSITION_TYPE_SLIDE_LEFT:
x -= allocation.width;
break;
case GTK_STACK_TRANSITION_TYPE_SLIDE_RIGHT:
x += allocation.width;
break;
case GTK_STACK_TRANSITION_TYPE_SLIDE_UP:
y -= allocation.height;
break;
case GTK_STACK_TRANSITION_TYPE_SLIDE_DOWN:
y += allocation.height;
break;
case GTK_STACK_TRANSITION_TYPE_OVER_UP:
case GTK_STACK_TRANSITION_TYPE_OVER_DOWN:
y = 0;
break;
case GTK_STACK_TRANSITION_TYPE_OVER_LEFT:
case GTK_STACK_TRANSITION_TYPE_OVER_RIGHT:
x = 0;
break;
default:
g_assert_not_reached ();
break;
}
x += priv->last_visible_surface_allocation.x;
y += priv->last_visible_surface_allocation.y;
if (gtk_widget_get_valign (priv->last_visible_child->widget) == GTK_ALIGN_END &&
priv->last_visible_widget_height > allocation.height)
y -= priv->last_visible_widget_height - allocation.height;
else if (gtk_widget_get_valign (priv->last_visible_child->widget) == GTK_ALIGN_CENTER)
y -= (priv->last_visible_widget_height - allocation.height) / 2;
cairo_save (cr);
cairo_set_source_surface (cr, priv->last_visible_surface, x, y);
cairo_paint (cr);
cairo_restore (cr);
}
if (gtk_cairo_should_draw_window (cr, priv->bin_window))
gtk_container_propagate_draw (GTK_CONTAINER (stack),
priv->visible_child->widget,
cr);
}
static gboolean
gtk_stack_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
cairo_t *pattern_cr;
if (gtk_cairo_should_draw_window (cr, priv->view_window))
{
GtkStyleContext *context;
context = gtk_widget_get_style_context (widget);
gtk_render_background (context,
cr,
0, 0,
gtk_widget_get_allocated_width (widget),
gtk_widget_get_allocated_height (widget));
}
if (priv->visible_child)
{
if (priv->transition_pos < 1.0)
{
if (priv->last_visible_surface == NULL &&
priv->last_visible_child != NULL)
{
gtk_widget_get_allocation (priv->last_visible_child->widget,
&priv->last_visible_surface_allocation);
priv->last_visible_surface =
gdk_window_create_similar_surface (gtk_widget_get_window (widget),
CAIRO_CONTENT_COLOR_ALPHA,
priv->last_visible_surface_allocation.width,
priv->last_visible_surface_allocation.height);
pattern_cr = cairo_create (priv->last_visible_surface);
/* We don't use propagate_draw here, because we don't want to apply
* the bin_window offset
*/
gtk_widget_draw (priv->last_visible_child->widget, pattern_cr);
cairo_destroy (pattern_cr);
}
switch (priv->active_transition_type)
{
case GTK_STACK_TRANSITION_TYPE_CROSSFADE:
if (gtk_cairo_should_draw_window (cr, priv->bin_window))
gtk_stack_draw_crossfade (widget, cr);
break;
case GTK_STACK_TRANSITION_TYPE_SLIDE_LEFT:
case GTK_STACK_TRANSITION_TYPE_SLIDE_RIGHT:
case GTK_STACK_TRANSITION_TYPE_SLIDE_UP:
case GTK_STACK_TRANSITION_TYPE_SLIDE_DOWN:
case GTK_STACK_TRANSITION_TYPE_OVER_UP:
case GTK_STACK_TRANSITION_TYPE_OVER_DOWN:
case GTK_STACK_TRANSITION_TYPE_OVER_LEFT:
case GTK_STACK_TRANSITION_TYPE_OVER_RIGHT:
gtk_stack_draw_slide (widget, cr);
break;
case GTK_STACK_TRANSITION_TYPE_UNDER_UP:
case GTK_STACK_TRANSITION_TYPE_UNDER_DOWN:
case GTK_STACK_TRANSITION_TYPE_UNDER_LEFT:
case GTK_STACK_TRANSITION_TYPE_UNDER_RIGHT:
if (gtk_cairo_should_draw_window (cr, priv->bin_window))
gtk_stack_draw_under (widget, cr);
break;
default:
g_assert_not_reached ();
}
}
else if (gtk_cairo_should_draw_window (cr, priv->bin_window))
gtk_container_propagate_draw (GTK_CONTAINER (stack),
priv->visible_child->widget,
cr);
}
return TRUE;
}
static void
gtk_stack_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkAllocation child_allocation;
g_return_if_fail (allocation != NULL);
gtk_widget_set_allocation (widget, allocation);
child_allocation.x = 0;
child_allocation.y = 0;
child_allocation.width = allocation->width;
child_allocation.height = allocation->height;
if (priv->last_visible_child)
gtk_widget_size_allocate (priv->last_visible_child->widget, &child_allocation);
if (priv->visible_child)
{
int min, nat;
GtkAlign valign;
gtk_widget_get_preferred_height_for_width (priv->visible_child->widget,
allocation->width,
&min, &nat);
if (priv->interpolate_size)
{
valign = gtk_widget_get_valign (priv->visible_child->widget);
child_allocation.height = MAX (nat, allocation->height);
if (valign == GTK_ALIGN_END &&
child_allocation.height > allocation->height)
child_allocation.y -= nat - allocation->height;
else if (valign == GTK_ALIGN_CENTER &&
child_allocation.height > allocation->height)
child_allocation.y -= (nat - allocation->height) / 2;
gtk_widget_size_allocate (priv->visible_child->widget, &child_allocation);
}
else
{
gtk_widget_size_allocate (priv->visible_child->widget, &child_allocation);
}
}
if (gtk_widget_get_realized (widget))
{
gdk_window_move_resize (priv->view_window,
allocation->x, allocation->y,
allocation->width, allocation->height);
gdk_window_move_resize (priv->bin_window,
get_bin_window_x (stack, allocation), get_bin_window_y (stack, allocation),
allocation->width, allocation->height);
}
}
#define LERP(a, b, t) ((a) + (((b) - (a)) * (1.0 - (t))))
static void
gtk_stack_get_preferred_height (GtkWidget *widget,
gint *minimum_height,
gint *natural_height)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkStackChildInfo *child_info;
GtkWidget *child;
gint child_min, child_nat;
GList *l;
*minimum_height = 0;
*natural_height = 0;
for (l = priv->children; l != NULL; l = l->next)
{
child_info = l->data;
child = child_info->widget;
if (!priv->vhomogeneous &&
priv->visible_child != child_info)
continue;
if (gtk_widget_get_visible (child))
{
gtk_widget_get_preferred_height (child, &child_min, &child_nat);
*minimum_height = MAX (*minimum_height, child_min);
*natural_height = MAX (*natural_height, child_nat);
}
}
if (priv->last_visible_child != NULL && !priv->vhomogeneous)
{
gdouble t = priv->interpolate_size ? ease_out_cubic (priv->transition_pos) : 1.0;
*minimum_height = LERP (*minimum_height, priv->last_visible_widget_height, t);
*natural_height = LERP (*natural_height, priv->last_visible_widget_height, t);
}
}
static void
gtk_stack_get_preferred_height_for_width (GtkWidget *widget,
gint width,
gint *minimum_height,
gint *natural_height)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkStackChildInfo *child_info;
GtkWidget *child;
gint child_min, child_nat;
GList *l;
*minimum_height = 0;
*natural_height = 0;
for (l = priv->children; l != NULL; l = l->next)
{
child_info = l->data;
child = child_info->widget;
if (!priv->vhomogeneous &&
priv->visible_child != child_info)
continue;
if (gtk_widget_get_visible (child))
{
gtk_widget_get_preferred_height_for_width (child, width, &child_min, &child_nat);
*minimum_height = MAX (*minimum_height, child_min);
*natural_height = MAX (*natural_height, child_nat);
}
}
if (priv->last_visible_child != NULL && !priv->vhomogeneous)
{
gdouble t = priv->interpolate_size ? ease_out_cubic (priv->transition_pos) : 1.0;
*minimum_height = LERP (*minimum_height, priv->last_visible_widget_height, t);
*natural_height = LERP (*natural_height, priv->last_visible_widget_height, t);
}
}
static void
gtk_stack_get_preferred_width (GtkWidget *widget,
gint *minimum_width,
gint *natural_width)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkStackChildInfo *child_info;
GtkWidget *child;
gint child_min, child_nat;
GList *l;
*minimum_width = 0;
*natural_width = 0;
for (l = priv->children; l != NULL; l = l->next)
{
child_info = l->data;
child = child_info->widget;
if (!priv->hhomogeneous &&
priv->visible_child != child_info)
continue;
if (gtk_widget_get_visible (child))
{
gtk_widget_get_preferred_width (child, &child_min, &child_nat);
*minimum_width = MAX (*minimum_width, child_min);
*natural_width = MAX (*natural_width, child_nat);
}
}
if (priv->last_visible_child != NULL && !priv->hhomogeneous)
{
gdouble t = priv->interpolate_size ? ease_out_cubic (priv->transition_pos) : 1.0;
*minimum_width = LERP (*minimum_width, priv->last_visible_widget_width, t);
*natural_width = LERP (*natural_width, priv->last_visible_widget_width, t);
}
}
static void
gtk_stack_get_preferred_width_for_height (GtkWidget *widget,
gint height,
gint *minimum_width,
gint *natural_width)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkStackChildInfo *child_info;
GtkWidget *child;
gint child_min, child_nat;
GList *l;
*minimum_width = 0;
*natural_width = 0;
for (l = priv->children; l != NULL; l = l->next)
{
child_info = l->data;
child = child_info->widget;
if (!priv->hhomogeneous &&
priv->visible_child != child_info)
continue;
if (gtk_widget_get_visible (child))
{
gtk_widget_get_preferred_width_for_height (child, height, &child_min, &child_nat);
*minimum_width = MAX (*minimum_width, child_min);
*natural_width = MAX (*natural_width, child_nat);
}
}
if (priv->last_visible_child != NULL && !priv->hhomogeneous)
{
gdouble t = priv->interpolate_size ? ease_out_cubic (priv->transition_pos) : 1.0;
*minimum_width = LERP (*minimum_width, priv->last_visible_widget_width, t);
*natural_width = LERP (*natural_width, priv->last_visible_widget_width, t);
}
}
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