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gtk2/gtk/gtkstack.c
Timm Bäder ee4ba18d5e stack: Don't underallocate child in interpolate-size case 
In that case, we can't just rely on the stack allocation being big
enough. Especially, the child can actually be bigger than the current
stack allocation, so take that into account when positioning it.
2016-10-31 19:29:36 +01:00

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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 "gtkcsscustomgadgetprivate.h"
#include "gtkcontainerprivate.h"
#include "gtkprogresstrackerprivate.h"
#include "gtksettingsprivate.h"
#include "gtkwidgetprivate.h"
#include "a11y/gtkstackaccessible.h"
#include "a11y/gtkstackaccessibleprivate.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.
*
* # CSS nodes
*
* GtkStack has a single CSS node named stack.
*/
/**
* 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,
LAST_CHILD_PROP
};
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;
GtkCssGadget *gadget;
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;
guint tick_id;
GtkProgressTracker tracker;
gboolean first_frame_skipped;
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 GParamSpec *stack_child_props[LAST_CHILD_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_measure_ (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline);
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,
const GtkAllocation *allocation);
static gint get_bin_window_y (GtkStack *stack,
const GtkAllocation *allocation);
G_DEFINE_TYPE_WITH_PRIVATE (GtkStack, gtk_stack, GTK_TYPE_CONTAINER)
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_clear_object (&priv->gadget);
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;
GtkStackChildInfo *info;
GList *l;
gint event_mask;
gtk_widget_set_realized (widget, TRUE);
gtk_widget_set_window (widget, g_object_ref (gtk_widget_get_parent_window (widget)));
gtk_css_gadget_get_content_allocation (priv->gadget, &allocation, NULL);
priv->view_window =
gdk_window_new_child (gtk_widget_get_window (GTK_WIDGET (stack)),
gtk_widget_get_events (widget),
&allocation);
gtk_widget_register_window (widget, priv->view_window);
event_mask = gtk_widget_get_events (widget);
for (l = priv->children; l != NULL; l = l->next)
{
info = l->data;
event_mask |= gtk_widget_get_events (info->widget);
}
priv->bin_window =
gdk_window_new_child (priv->view_window,
event_mask,
&(GdkRectangle) {
get_bin_window_x (stack, &allocation),
get_bin_window_y (stack, &allocation),
allocation.width,
allocation.height});
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->bin_window = NULL;
gtk_widget_unregister_window (widget, priv->view_window);
gdk_window_destroy (priv->view_window);
priv->view_window = NULL;
GTK_WIDGET_CLASS (gtk_stack_parent_class)->unrealize (widget);
}
static void
gtk_stack_map (GtkWidget *widget)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GTK_WIDGET_CLASS (gtk_stack_parent_class)->map (widget);
gdk_window_show (priv->view_window);
}
static void
gtk_stack_unmap (GtkWidget *widget)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
gdk_window_hide (priv->view_window);
GTK_WIDGET_CLASS (gtk_stack_parent_class)->unmap (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->map = gtk_stack_map;
widget_class->unmap = gtk_stack_unmap;
widget_class->measure = gtk_stack_measure_;
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;
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_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_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_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_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_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
g_object_class_install_properties (object_class, LAST_PROP, stack_props);
stack_child_props[CHILD_PROP_NAME] =
g_param_spec_string ("name",
P_("Name"),
P_("The name of the child page"),
NULL,
GTK_PARAM_READWRITE);
stack_child_props[CHILD_PROP_TITLE] =
g_param_spec_string ("title",
P_("Title"),
P_("The title of the child page"),
NULL,
GTK_PARAM_READWRITE);
stack_child_props[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);
stack_child_props[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
*/
stack_child_props[CHILD_PROP_NEEDS_ATTENTION] =
g_param_spec_boolean ("needs-attention",
P_("Needs Attention"),
P_("Whether this page needs attention"),
FALSE,
GTK_PARAM_READWRITE);
gtk_container_class_install_child_properties (container_class, LAST_CHILD_PROP, stack_child_props);
gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_STACK_ACCESSIBLE);
gtk_widget_class_set_css_name (widget_class, "stack");
}
/**
* 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_container_child_notify_by_pspec (GTK_CONTAINER (stack), child, stack_child_props[CHILD_PROP_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", name);
break;
}
}
g_free (info->name);
info->name = name;
gtk_container_child_notify_by_pspec (container, child, pspec);
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_by_pspec (container, child, pspec);
break;
case CHILD_PROP_ICON_NAME:
g_free (info->icon_name);
info->icon_name = g_value_dup_string (value);
gtk_container_child_notify_by_pspec (container, child, pspec);
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_by_pspec (container, child, pspec);
break;
default:
GTK_CONTAINER_WARN_INVALID_CHILD_PROPERTY_ID (container, property_id, pspec);
break;
}
}
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,
const GtkAllocation *allocation)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
int x = 0;
if (gtk_progress_tracker_get_state (&priv->tracker) != GTK_PROGRESS_STATE_AFTER)
{
if (is_left_transition (priv->active_transition_type))
x = allocation->width * (1 - gtk_progress_tracker_get_ease_out_cubic (&priv->tracker, FALSE));
if (is_right_transition (priv->active_transition_type))
x = -allocation->width * (1 - gtk_progress_tracker_get_ease_out_cubic (&priv->tracker, FALSE));
}
return x;
}
static gint
get_bin_window_y (GtkStack *stack,
const GtkAllocation *allocation)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
int y = 0;
if (gtk_progress_tracker_get_state (&priv->tracker) != GTK_PROGRESS_STATE_AFTER)
{
if (is_up_transition (priv->active_transition_type))
y = allocation->height * (1 - gtk_progress_tracker_get_ease_out_cubic (&priv->tracker, FALSE));
if (is_down_transition(priv->active_transition_type))
y = -allocation->height * (1 - gtk_progress_tracker_get_ease_out_cubic (&priv->tracker, FALSE));
}
return y;
}
static void
gtk_stack_progress_updated (GtkStack *stack)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
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));
}
if (gtk_progress_tracker_get_state (&priv->tracker) == GTK_PROGRESS_STATE_AFTER)
{
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;
}
}
}
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);
if (priv->first_frame_skipped)
gtk_progress_tracker_advance_frame (&priv->tracker,
gdk_frame_clock_get_frame_time (frame_clock));
else
priv->first_frame_skipped = TRUE;
/* Finish animation early if not mapped anymore */
if (!gtk_widget_get_mapped (widget))
gtk_progress_tracker_finish (&priv->tracker);
gtk_stack_progress_updated (GTK_STACK (widget));
if (gtk_progress_tracker_get_state (&priv->tracker) == GTK_PROGRESS_STATE_AFTER)
{
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);
if (gtk_widget_get_mapped (widget) &&
gtk_settings_get_enable_animations (gtk_widget_get_settings (widget)) &&
transition_type != GTK_STACK_TRANSITION_TYPE_NONE &&
transition_duration != 0 &&
priv->last_visible_child != NULL)
{
priv->active_transition_type = effective_transition_type (stack, transition_type);
priv->first_frame_skipped = FALSE;
gtk_stack_schedule_ticks (stack);
gtk_progress_tracker_start (&priv->tracker,
priv->transition_duration * 1000,
0,
1.0);
}
else
{
gtk_stack_unschedule_ticks (stack);
priv->active_transition_type = GTK_STACK_TRANSITION_TYPE_NONE;
gtk_progress_tracker_finish (&priv->tracker);
}
gtk_stack_progress_updated (GTK_STACK (widget));
}
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))
{
GtkAllocation allocation;
priv->last_visible_child = priv->visible_child;
gtk_widget_get_allocated_size (priv->last_visible_child->widget, &allocation, NULL);
priv->last_visible_widget_width = allocation.width;
priv->last_visible_widget_height = allocation.height;
}
else
{
gtk_widget_set_child_visible (priv->visible_child->widget, FALSE);
}
}
gtk_stack_accessible_update_visible_child (stack,
priv->visible_child ? priv->visible_child->widget : NULL,
child_info ? child_info->widget : NULL);
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);
}
if (priv->hhomogeneous && priv->vhomogeneous)
gtk_widget_queue_allocate (widget);
else
gtk_widget_queue_resize (widget);
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_child_visible (child, FALSE);
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_container_child_notify_by_pspec (container, child, stack_child_props[CHILD_PROP_POSITION]);
if (priv->visible_child == NULL &&
gtk_widget_get_visible (child))
set_visible_child (stack, child_info, priv->transition_type, priv->transition_duration);
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) (nullable): 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 #GtkStack: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 wether the #GtkStack is set up to interpolate between
* the sizes of children on page switch.
*
* Returns: %TRUE if child sizes are interpolated
*
* 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) (nullable): 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) (nullable): 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);
gdouble progress = gtk_progress_tracker_get_progress (&priv->tracker, FALSE);
cairo_push_group (cr);
gtk_container_propagate_draw (GTK_CONTAINER (stack),
priv->visible_child->widget,
cr);
cairo_save (cr);
/* Multiply alpha by progress */
cairo_set_source_rgba (cr, 1, 1, 1, progress);
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 - progress, 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 * (gtk_progress_tracker_get_ease_out_cubic (&priv->tracker, FALSE));
pos_y = height;
break;
case GTK_STACK_TRANSITION_TYPE_UNDER_UP:
y = allocation.height * (1 - gtk_progress_tracker_get_ease_out_cubic (&priv->tracker, FALSE));
height = allocation.height - y;
pos_y = y - allocation.height;
break;
case GTK_STACK_TRANSITION_TYPE_UNDER_LEFT:
x = allocation.width * (1 - gtk_progress_tracker_get_ease_out_cubic (&priv->tracker, FALSE));
width = allocation.width - x;
pos_x = x - allocation.width;
break;
case GTK_STACK_TRANSITION_TYPE_UNDER_RIGHT:
x = 0;
width = allocation.width * (gtk_progress_tracker_get_ease_out_cubic (&priv->tracker, FALSE));
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);
gtk_css_gadget_draw (priv->gadget, cr);
return FALSE;
}
static gboolean
gtk_stack_render (GtkCssGadget *gadget,
cairo_t *cr,
int x,
int y,
int width,
int height,
gpointer data)
{
GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
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 (gtk_progress_tracker_get_state (&priv->tracker) != GTK_PROGRESS_STATE_AFTER)
{
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);
}
cairo_rectangle (cr,
0, 0,
gtk_widget_get_allocated_width (widget),
gtk_widget_get_allocated_height (widget));
cairo_clip (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 FALSE;
}
static void
gtk_stack_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkStack *stack = GTK_STACK (widget);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
GtkAllocation clip;
gtk_widget_set_allocation (widget, allocation);
gtk_css_gadget_allocate (priv->gadget,
allocation,
gtk_widget_get_allocated_baseline (widget),
&clip);
clip.x += allocation->x;
clip.y += allocation->y;
gtk_widget_set_clip (widget, &clip);
}
static void
gtk_stack_allocate (GtkCssGadget *gadget,
const GtkAllocation *allocation,
int baseline,
GtkAllocation *out_clip,
gpointer data)
{
GtkWidget *widget;
GtkStack *stack;
GtkStackPrivate *priv;
GtkAllocation child_allocation;
widget = gtk_css_gadget_get_owner (gadget);
stack = GTK_STACK (widget);
priv = gtk_stack_get_instance_private (stack);
child_allocation.x = 0;
child_allocation.y = 0;
if (priv->last_visible_child)
{
int min, nat;
gtk_widget_get_preferred_width (priv->last_visible_child->widget, &min, &nat);
child_allocation.width = MAX (min, allocation->width);
gtk_widget_get_preferred_height_for_width (priv->last_visible_child->widget,
child_allocation.width,
&min, &nat);
child_allocation.height = MAX (min, allocation->height);
gtk_widget_size_allocate (priv->last_visible_child->widget, &child_allocation);
if (!gdk_rectangle_equal (&priv->last_visible_surface_allocation,
&child_allocation))
{
cairo_surface_destroy (priv->last_visible_surface);
priv->last_visible_surface = NULL;
}
}
child_allocation.width = allocation->width;
child_allocation.height = allocation->height;
if (priv->visible_child)
{
int min_width;
int min_height;
gtk_widget_measure (priv->visible_child->widget, GTK_ORIENTATION_HORIZONTAL,
allocation->height, &min_width, NULL, NULL, NULL);
child_allocation.width = MAX (child_allocation.width, min_width);
gtk_widget_measure (priv->visible_child->widget, GTK_ORIENTATION_VERTICAL,
child_allocation.width, &min_height, NULL, NULL, NULL);
child_allocation.height = MAX (child_allocation.height, min_height);
if (child_allocation.width > allocation->width)
{
GtkAlign halign = gtk_widget_get_halign (priv->visible_child->widget);
if (halign == GTK_ALIGN_CENTER || halign == GTK_ALIGN_FILL)
child_allocation.x = (allocation->width - child_allocation.width) / 2;
else if (halign == GTK_ALIGN_END)
child_allocation.x = (allocation->width - child_allocation.width);
}
if (child_allocation.height > allocation->height)
{
GtkAlign valign = gtk_widget_get_valign (priv->visible_child->widget);
if (valign == GTK_ALIGN_CENTER || valign == GTK_ALIGN_FILL)
child_allocation.y = (allocation->height - child_allocation.height) / 2;
else if (valign == GTK_ALIGN_END)
child_allocation.x = (allocation->height - child_allocation.height);
}
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);
}
gtk_container_get_children_clip (GTK_CONTAINER (widget), out_clip);
}
static void
gtk_stack_measure_ (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (GTK_STACK (widget));
gtk_css_gadget_get_preferred_size (priv->gadget,
orientation,
for_size,
minimum, natural,
minimum_baseline, natural_baseline);
}
#define LERP(a, b, t) ((a) + (((b) - (a)) * (1.0 - (t))))
static void
gtk_stack_measure (GtkCssGadget *gadget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline,
gpointer data)
{
GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
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 = 0;
*natural = 0;
for (l = priv->children; l != NULL; l = l->next)
{
child_info = l->data;
child = child_info->widget;
if (((orientation == GTK_ORIENTATION_VERTICAL && !priv->vhomogeneous) ||
(orientation == GTK_ORIENTATION_HORIZONTAL && !priv->hhomogeneous)) &&
priv->visible_child != child_info)
continue;
if (gtk_widget_get_visible (child))
{
gtk_widget_measure (child, orientation, for_size, &child_min, &child_nat, NULL, NULL);
*minimum = MAX (*minimum, child_min);
*natural = MAX (*natural, child_nat);
}
}
if (priv->last_visible_child != NULL)
{
if (orientation == GTK_ORIENTATION_VERTICAL && !priv->vhomogeneous)
{
gdouble t = priv->interpolate_size ? gtk_progress_tracker_get_ease_out_cubic (&priv->tracker, FALSE) : 1.0;
*minimum = LERP (*minimum, priv->last_visible_widget_height, t);
*natural = LERP (*natural, priv->last_visible_widget_height, t);
}
if (orientation == GTK_ORIENTATION_HORIZONTAL && !priv->hhomogeneous)
{
gdouble t = priv->interpolate_size ? gtk_progress_tracker_get_ease_out_cubic (&priv->tracker, FALSE) : 1.0;
*minimum = LERP (*minimum, priv->last_visible_widget_width, t);
*natural = LERP (*natural, priv->last_visible_widget_width, t);
}
}
}
static void
gtk_stack_init (GtkStack *stack)
{
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
gtk_widget_set_has_window (GTK_WIDGET (stack), FALSE);
priv->vhomogeneous = TRUE;
priv->hhomogeneous = TRUE;
priv->transition_duration = 200;
priv->transition_type = GTK_STACK_TRANSITION_TYPE_NONE;
priv->gadget = gtk_css_custom_gadget_new_for_node (gtk_widget_get_css_node (GTK_WIDGET (stack)),
GTK_WIDGET (stack),
gtk_stack_measure,
gtk_stack_allocate,
gtk_stack_render,
NULL,
NULL);
}
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