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gtk2/gtk/gtkstack.c
Philip Chimento a27b0bad86 stack: More readability when adding transitions 
This small refactor makes the code more readable when adding more
transition types that have left, right, up, and down variations.

It adds inline boolean functions to tell information about transition
types (avoiding long if clauses) and changes long chains of "else if
(transition_type == ...)" into switch statements. Both are only likely
to get longer as more transition types are added.

https://bugzilla.gnome.org/show_bug.cgi?id=726676
2014-05-02 16:54:41 -04:00

2018 lines
64 KiB
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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 or uncover the new page, according to order. Since: 3.12
*
* 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_VISIBLE_CHILD,
PROP_VISIBLE_CHILD_NAME,
PROP_TRANSITION_DURATION,
PROP_TRANSITION_TYPE,
PROP_TRANSITION_RUNNING,
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;
};
typedef struct {
GList *children;
GdkWindow* bin_window;
GdkWindow* view_window;
GtkStackChildInfo *visible_child;
gboolean homogeneous;
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;
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)
{
gtk_widget_set_has_window ((GtkWidget*) stack, TRUE);
gtk_widget_set_redraw_on_allocate ((GtkWidget*) stack, TRUE);
}
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);
GtkStackPrivate *priv = gtk_stack_get_instance_private (stack);
switch (property_id)
{
case PROP_HOMOGENEOUS:
g_value_set_boolean (value, priv->homogeneous);
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;
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_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;
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;
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->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;
/*container_class->get_path_for_child = gtk_stack_get_path_for_child; */
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_CONSTRUCT);
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);
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);
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);
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);
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);
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 = g_list_next (l);
num++;
}
g_return_if_fail (old_link != NULL);
if (old_link == new_link || (g_list_next (old_link) == 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;
GList *list;
guint i;
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:
i = 0;
for (list = priv->children; list != NULL; list = g_list_next (list))
{
if (info == list->data)
break;
++i;
}
g_value_set_int (value, i);
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 (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);
}
/* 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;
}
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->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 || priv->last_visible_surface != NULL)
{
if (priv->last_visible_child)
{
gtk_widget_set_child_visible (priv->last_visible_child->widget, FALSE);
priv->last_visible_child = NULL;
}
}
if (done)
{
if (priv->last_visible_surface != NULL)
{
cairo_surface_destroy (priv->last_visible_surface);
priv->last_visible_surface = 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 (GTK_WIDGET (stack)))
t = 1.0;
if (gtk_stack_set_transition_position (stack, t))
{
gtk_widget_set_opacity (GTK_WIDGET (stack), 1.0);
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;
}
}
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;
/* 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;
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))
priv->last_visible_child = priv->visible_child;
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 ((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 = g_list_next (l))
{
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);
}
gtk_widget_queue_resize (GTK_WIDGET (stack));
gtk_widget_queue_draw (GTK_WIDGET (stack));
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;
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));
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->homogeneous || 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);
g_slice_free (GtkStackChildInfo, child_info);
if (priv->homogeneous && 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: 3.10
*/
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->homogeneous == homogeneous)
return;
priv->homogeneous = homogeneous;
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]);
}
/**
* 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->homogeneous;
}
/**
* 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));
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));
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_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));
g_return_if_fail (name != NULL);
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;
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 (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 = *allocation;
child_allocation.x = 0;
child_allocation.y = 0;
if (priv->last_visible_child)
gtk_widget_size_allocate (priv->last_visible_child->widget, &child_allocation);
if (priv->visible_child)
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);
}
}
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->homogeneous &&
(priv->visible_child != child_info &&
priv->last_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_surface != NULL)
{
*minimum_height = MAX (*minimum_height, priv->last_visible_surface_allocation.height);
*natural_height = MAX (*natural_height, priv->last_visible_surface_allocation.height);
}
}
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->homogeneous &&
(priv->visible_child != child_info &&
priv->last_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_surface != NULL)
{
*minimum_height = MAX (*minimum_height, priv->last_visible_surface_allocation.height);
*natural_height = MAX (*natural_height, priv->last_visible_surface_allocation.height);
}
}
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->homogeneous &&
(priv->visible_child != child_info &&
priv->last_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_surface != NULL)
{
*minimum_width = MAX (*minimum_width, priv->last_visible_surface_allocation.width);
*natural_width = MAX (*natural_width, priv->last_visible_surface_allocation.width);
}
}
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->homogeneous &&
(priv->visible_child != child_info &&
priv->last_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_surface != NULL)
{
*minimum_width = MAX (*minimum_width, priv->last_visible_surface_allocation.width);
*natural_width = MAX (*natural_width, priv->last_visible_surface_allocation.width);
}
}
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