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gtk2/gtk/gtkcssnode.c
Matthias Clasen 68edc47f6a Add a function to dump CSS nodes and styles 
Add a gtk_style_context_to_string function that can serialize
a CSS node or tree of nodes, optionally including CSS properties
as well.

This will be useful in writing tests.
2016-01-03 09:19:30 -05:00

1711 lines
47 KiB
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/* GTK - The GIMP Toolkit
* Copyright (C) 2014 Benjamin Otte <otte@gnome.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "gtkcssnodeprivate.h"
#include "gtkcssanimatedstyleprivate.h"
#include "gtkdebug.h"
#include "gtkintl.h"
#include "gtkmarshalers.h"
#include "gtksettingsprivate.h"
#include "gtktypebuiltins.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkcsssectionprivate.h"
/*
* CSS nodes are the backbone of the GtkStyleContext implementation and
* replace the role that GtkWidgetPath played in the past. A CSS node has
* an element name and a state, and can have an id and style classes, which
* is what is needed to determine the matching CSS selectors. CSS nodes have
* a 'visible' property, which makes it possible to temporarily 'hide' them
* from CSS matching - e.g. an invisible node will not affect :nth-child
* matching and so forth.
*
* The API to manage states, names, ids and classes of CSS nodes is:
* - gtk_css_node_get/set_state. States are represented as GtkStateFlags
* - gtk_css_node_get/set_name. Names are represented as interned strings
* - gtk_css_node_get/set_id. Ids are represented as interned strings
* - gtk_css_node_add/remove/has_class and gtk_css_node_list_classes. Style
* classes are represented as quarks.
*
* CSS nodes are organized in a dom-like tree, and there is API to navigate
* and manipulate this tree:
* - gtk_css_node_set_parent
* - gtk_css_node_insert_before/after
* - gtk_css_node_get_parent
* - gtk_css_node_get_first/last_child
* - gtk_css_node_get_previous/next_sibling
* Note that parents keep a reference on their children in this tree.
*
* Every widget has one or more CSS nodes - the first one gets created
* automatically by GtkStyleContext. To set the name of the main node,
* call gtk_widget_class_set_css_name() in class_init(). Widget implementations
* can and should add subnodes as suitable.
*
* Best practice is:
* - For permanent subnodes, create them in init(), and keep a pointer
* to the node (you don't have to keep a reference, cleanup will be
* automatic by means of the parent node getting cleaned up by the
* style context).
* - For transient nodes, create/destroy them when the conditions that
* warrant their existence change.
* - Keep the state of all your nodes up-to-date. This probably requires
* a ::state-flags-changed (and possibly ::direction-changed) handler,
* as well as code to update the state in other places. Note that GTK+
* does this automatically for the widget's main CSS node.
* - The sibling ordering in the CSS node tree is supposed to correspond
* to the visible order of content: top-to-bottom and left-to-right.
* Reorder your nodes to maintain this correlation. In particular for
* horizontally layed out widgets, this will require listening to
* ::direction-changed.
* - The draw function should just use gtk_style_context_save_to_node() to
* 'switch' to the right node, not make any other changes to the style
* context.
*
* A noteworthy difference between gtk_style_context_save() and
* gtk_style_context_save_to_node() is that the former inherits all the
* style classes from the main CSS node, which often leads to unintended
* inheritance.
*/
/* When these change we do a full restyling. Otherwise we try to figure out
* if we need to change things. */
#define GTK_CSS_RADICAL_CHANGE (GTK_CSS_CHANGE_ID | GTK_CSS_CHANGE_NAME | GTK_CSS_CHANGE_CLASS | GTK_CSS_CHANGE_SOURCE | GTK_CSS_CHANGE_PARENT_STYLE)
G_DEFINE_TYPE (GtkCssNode, gtk_css_node, G_TYPE_OBJECT)
enum {
NODE_ADDED,
NODE_REMOVED,
STYLE_CHANGED,
LAST_SIGNAL
};
enum {
PROP_0,
PROP_CLASSES,
PROP_ID,
PROP_NAME,
PROP_STATE,
PROP_VISIBLE,
PROP_WIDGET_TYPE,
NUM_PROPERTIES
};
struct _GtkCssNodeStyleChange {
GtkCssStyle *old_style;
GtkCssStyle *new_style;
};
static guint cssnode_signals[LAST_SIGNAL] = { 0 };
static GParamSpec *cssnode_properties[NUM_PROPERTIES];
static GQuark quark_global_cache;
static GtkStyleProviderPrivate *
gtk_css_node_get_style_provider_or_null (GtkCssNode *cssnode)
{
return GTK_CSS_NODE_GET_CLASS (cssnode)->get_style_provider (cssnode);
}
static void
gtk_css_node_set_invalid (GtkCssNode *node,
gboolean invalid)
{
if (node->invalid == invalid)
return;
node->invalid = invalid;
if (node->visible)
{
if (node->parent)
{
if (invalid)
gtk_css_node_set_invalid (node->parent, TRUE);
}
else
{
if (invalid)
GTK_CSS_NODE_GET_CLASS (node)->queue_validate (node);
else
GTK_CSS_NODE_GET_CLASS (node)->dequeue_validate (node);
}
}
}
static void
gtk_css_node_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GtkCssNode *cssnode = GTK_CSS_NODE (object);
switch (property_id)
{
case PROP_CLASSES:
g_value_take_boxed (value, gtk_css_node_get_classes (cssnode));
break;
case PROP_ID:
g_value_set_string (value, gtk_css_node_get_id (cssnode));
break;
case PROP_NAME:
g_value_set_string (value, gtk_css_node_get_name (cssnode));
break;
case PROP_STATE:
g_value_set_flags (value, gtk_css_node_get_state (cssnode));
break;
case PROP_VISIBLE:
g_value_set_boolean (value, gtk_css_node_get_visible (cssnode));
break;
case PROP_WIDGET_TYPE:
g_value_set_gtype (value, gtk_css_node_get_widget_type (cssnode));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
gtk_css_node_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GtkCssNode *cssnode = GTK_CSS_NODE (object);
switch (property_id)
{
case PROP_CLASSES:
gtk_css_node_set_classes (cssnode, g_value_get_boxed (value));
break;
case PROP_ID:
gtk_css_node_set_id (cssnode, g_value_get_string (value));
break;
case PROP_NAME:
gtk_css_node_set_name (cssnode, g_value_get_string (value));
break;
case PROP_STATE:
gtk_css_node_set_state (cssnode, g_value_get_flags (value));
break;
case PROP_VISIBLE:
gtk_css_node_set_visible (cssnode, g_value_get_boolean (value));
break;
case PROP_WIDGET_TYPE:
gtk_css_node_set_widget_type (cssnode, g_value_get_gtype (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
gtk_css_node_dispose (GObject *object)
{
GtkCssNode *cssnode = GTK_CSS_NODE (object);
while (cssnode->first_child)
{
gtk_css_node_set_parent (cssnode->first_child, NULL);
}
gtk_css_node_set_invalid (cssnode, FALSE);
G_OBJECT_CLASS (gtk_css_node_parent_class)->dispose (object);
}
static void
gtk_css_node_finalize (GObject *object)
{
GtkCssNode *cssnode = GTK_CSS_NODE (object);
if (cssnode->style)
g_object_unref (cssnode->style);
gtk_css_node_declaration_unref (cssnode->decl);
G_OBJECT_CLASS (gtk_css_node_parent_class)->finalize (object);
}
static gboolean
gtk_css_node_is_first_child (GtkCssNode *node)
{
GtkCssNode *iter;
for (iter = node->previous_sibling;
iter != NULL;
iter = iter->previous_sibling)
{
if (iter->visible)
return FALSE;
}
return TRUE;
}
static gboolean
gtk_css_node_is_last_child (GtkCssNode *node)
{
GtkCssNode *iter;
for (iter = node->next_sibling;
iter != NULL;
iter = iter->next_sibling)
{
if (iter->visible)
return FALSE;
}
return TRUE;
}
#define UNPACK_DECLARATION(packed) ((GtkCssNodeDeclaration *) (GPOINTER_TO_SIZE (packed) & ~0x3))
#define UNPACK_FLAGS(packed) (GPOINTER_TO_SIZE (packed) & 0x3)
#define PACK(decl, first_child, last_child) GSIZE_TO_POINTER (GPOINTER_TO_SIZE (decl) | ((first_child) ? 0x2 : 0) | ((last_child) ? 0x1 : 0))
static gboolean
may_use_global_parent_cache (GtkCssNode *node)
{
GtkStyleProviderPrivate *provider;
GtkCssNode *parent;
parent = gtk_css_node_get_parent (node);
if (parent == NULL)
return FALSE;
provider = gtk_css_node_get_style_provider_or_null (node);
if (provider != NULL && provider != gtk_css_node_get_style_provider (parent))
return FALSE;
return TRUE;
}
static GtkCssStyle *
lookup_in_global_parent_cache (GtkCssNode *node,
GtkCssStyle *parent,
const GtkCssNodeDeclaration *decl)
{
GHashTable *cache;
GtkCssStyle *style;
if (parent == NULL ||
!may_use_global_parent_cache (node))
return NULL;
cache = g_object_get_qdata (G_OBJECT (parent), quark_global_cache);
if (cache == NULL)
return NULL;
style = g_hash_table_lookup (cache,
PACK (decl,
gtk_css_node_is_first_child (node),
gtk_css_node_is_last_child (node)));
return style;
}
static gboolean
may_be_stored_in_parent_cache (GtkCssStyle *style)
{
GtkCssChange change;
change = gtk_css_static_style_get_change (GTK_CSS_STATIC_STYLE (style));
/* The cache is shared between all children of the parent, so if a
* style depends on a sibling it is not independant of the child.
*/
if (change & GTK_CSS_CHANGE_ANY_SIBLING)
return FALSE;
/* Again, the cache is shared between all children of the parent.
* If the position is relevant, no child has the same style.
*/
if (change & (GTK_CSS_CHANGE_NTH_CHILD | GTK_CSS_CHANGE_NTH_LAST_CHILD))
return FALSE;
return TRUE;
}
static guint
gtk_global_parent_cache_hash (gconstpointer item)
{
return gtk_css_node_declaration_hash (UNPACK_DECLARATION (item)) << 2
| UNPACK_FLAGS (item);
}
static gboolean
gtk_global_parent_cache_equal (gconstpointer item1,
gconstpointer item2)
{
if (UNPACK_FLAGS (item1) != UNPACK_FLAGS (item2))
return FALSE;
return gtk_css_node_declaration_equal (UNPACK_DECLARATION (item1),
UNPACK_DECLARATION (item2));
}
static void
gtk_global_parent_cache_free (gpointer item)
{
gtk_css_node_declaration_unref (UNPACK_DECLARATION (item));
}
static void
store_in_global_parent_cache (GtkCssNode *node,
GtkCssStyle *parent,
const GtkCssNodeDeclaration *decl,
GtkCssStyle *style)
{
GHashTable *cache;
g_assert (GTK_IS_CSS_STATIC_STYLE (style));
if (parent == NULL ||
!may_use_global_parent_cache (node))
return;
if (!may_be_stored_in_parent_cache (style))
return;
cache = g_object_get_qdata (G_OBJECT (parent), quark_global_cache);
if (cache == NULL)
{
cache = g_hash_table_new_full (gtk_global_parent_cache_hash,
gtk_global_parent_cache_equal,
gtk_global_parent_cache_free,
g_object_unref);
g_object_set_qdata_full (G_OBJECT (parent),
quark_global_cache,
cache,
(GDestroyNotify) g_hash_table_destroy);
}
g_hash_table_insert (cache,
PACK (gtk_css_node_declaration_ref ((GtkCssNodeDeclaration *) decl),
gtk_css_node_is_first_child (node),
gtk_css_node_is_last_child (node)),
g_object_ref (style));
}
static GtkCssStyle *
gtk_css_node_create_style (GtkCssNode *cssnode)
{
const GtkCssNodeDeclaration *decl;
GtkCssMatcher matcher;
GtkCssStyle *parent;
GtkCssStyle *style;
decl = gtk_css_node_get_declaration (cssnode);
parent = cssnode->parent ? cssnode->parent->style : NULL;
style = lookup_in_global_parent_cache (cssnode, parent, decl);
if (style)
return g_object_ref (style);
if (gtk_css_node_init_matcher (cssnode, &matcher))
style = gtk_css_static_style_new_compute (gtk_css_node_get_style_provider (cssnode),
&matcher,
parent);
else
style = gtk_css_static_style_new_compute (gtk_css_node_get_style_provider (cssnode),
NULL,
parent);
store_in_global_parent_cache (cssnode, parent, decl, style);
return style;
}
static gboolean
should_create_transitions (GtkCssChange change)
{
return (change & GTK_CSS_CHANGE_ANIMATIONS) == 0;
}
static gboolean
gtk_css_style_needs_recreation (GtkCssStyle *style,
GtkCssChange change)
{
/* Try to avoid invalidating if we can */
if (change & GTK_CSS_RADICAL_CHANGE)
return TRUE;
if (GTK_IS_CSS_ANIMATED_STYLE (style))
style = GTK_CSS_ANIMATED_STYLE (style)->style;
if (gtk_css_static_style_get_change (GTK_CSS_STATIC_STYLE (style)) & change)
return TRUE;
else
return FALSE;
}
static GtkCssStyle *
gtk_css_node_real_update_style (GtkCssNode *cssnode,
GtkCssChange change,
gint64 timestamp,
GtkCssStyle *style)
{
GtkCssStyle *static_style, *new_static_style, *new_style;
if (GTK_IS_CSS_ANIMATED_STYLE (style))
{
static_style = GTK_CSS_ANIMATED_STYLE (style)->style;
}
else
{
static_style = style;
}
if (gtk_css_style_needs_recreation (static_style, change))
new_static_style = gtk_css_node_create_style (cssnode);
else
new_static_style = g_object_ref (static_style);
if (new_static_style != static_style || (change & GTK_CSS_CHANGE_ANIMATIONS))
{
GtkCssNode *parent = gtk_css_node_get_parent (cssnode);
new_style = gtk_css_animated_style_new (new_static_style,
parent ? gtk_css_node_get_style (parent) : NULL,
timestamp,
gtk_css_node_get_style_provider (cssnode),
should_create_transitions (change) ? style : NULL);
}
else if (static_style != style && (change & GTK_CSS_CHANGE_TIMESTAMP))
{
new_style = gtk_css_animated_style_new_advance (GTK_CSS_ANIMATED_STYLE (style),
static_style,
timestamp);
}
else
{
new_style = g_object_ref (style);
}
if (!gtk_css_style_is_static (new_style))
gtk_css_node_set_invalid (cssnode, TRUE);
g_object_unref (new_static_style);
return new_style;
}
static void
gtk_css_node_real_invalidate (GtkCssNode *node)
{
}
static void
gtk_css_node_real_queue_validate (GtkCssNode *node)
{
}
static void
gtk_css_node_real_dequeue_validate (GtkCssNode *node)
{
}
static void
gtk_css_node_real_validate (GtkCssNode *node)
{
}
gboolean
gtk_css_node_real_init_matcher (GtkCssNode *cssnode,
GtkCssMatcher *matcher)
{
_gtk_css_matcher_node_init (matcher, cssnode);
return TRUE;
}
static GtkWidgetPath *
gtk_css_node_real_create_widget_path (GtkCssNode *cssnode)
{
return gtk_widget_path_new ();
}
static const GtkWidgetPath *
gtk_css_node_real_get_widget_path (GtkCssNode *cssnode)
{
return NULL;
}
static GtkStyleProviderPrivate *
gtk_css_node_real_get_style_provider (GtkCssNode *cssnode)
{
return NULL;
}
static GdkFrameClock *
gtk_css_node_real_get_frame_clock (GtkCssNode *cssnode)
{
return NULL;
}
static void
gtk_css_node_real_node_removed (GtkCssNode *parent,
GtkCssNode *node,
GtkCssNode *previous)
{
if (node->previous_sibling)
node->previous_sibling->next_sibling = node->next_sibling;
else
node->parent->first_child = node->next_sibling;
if (node->next_sibling)
node->next_sibling->previous_sibling = node->previous_sibling;
else
node->parent->last_child = node->previous_sibling;
node->previous_sibling = NULL;
node->next_sibling = NULL;
node->parent = NULL;
}
static void
gtk_css_node_real_node_added (GtkCssNode *parent,
GtkCssNode *node,
GtkCssNode *new_previous)
{
if (new_previous)
{
node->previous_sibling = new_previous;
node->next_sibling = new_previous->next_sibling;
new_previous->next_sibling = node;
}
else
{
node->next_sibling = parent->first_child;
parent->first_child = node;
}
if (node->next_sibling)
node->next_sibling->previous_sibling = node;
else
parent->last_child = node;
node->parent = parent;
}
static void
gtk_css_node_real_style_changed (GtkCssNode *cssnode,
GtkCssStyleChange *change)
{
g_set_object (&cssnode->style, gtk_css_style_change_get_new_style (change));
}
static void
gtk_css_node_class_init (GtkCssNodeClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
quark_global_cache = g_quark_from_static_string ("gtk-global-cache");
object_class->get_property = gtk_css_node_get_property;
object_class->set_property = gtk_css_node_set_property;
object_class->dispose = gtk_css_node_dispose;
object_class->finalize = gtk_css_node_finalize;
klass->update_style = gtk_css_node_real_update_style;
klass->invalidate = gtk_css_node_real_invalidate;
klass->validate = gtk_css_node_real_validate;
klass->queue_validate = gtk_css_node_real_queue_validate;
klass->dequeue_validate = gtk_css_node_real_dequeue_validate;
klass->init_matcher = gtk_css_node_real_init_matcher;
klass->create_widget_path = gtk_css_node_real_create_widget_path;
klass->get_widget_path = gtk_css_node_real_get_widget_path;
klass->get_style_provider = gtk_css_node_real_get_style_provider;
klass->get_frame_clock = gtk_css_node_real_get_frame_clock;
klass->node_added = gtk_css_node_real_node_added;
klass->node_removed = gtk_css_node_real_node_removed;
klass->style_changed = gtk_css_node_real_style_changed;
cssnode_signals[NODE_ADDED] =
g_signal_new (I_("node-added"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkCssNodeClass, node_added),
NULL, NULL,
_gtk_marshal_VOID__OBJECT_OBJECT,
G_TYPE_NONE, 2,
GTK_TYPE_CSS_NODE, GTK_TYPE_CSS_NODE);
cssnode_signals[NODE_REMOVED] =
g_signal_new (I_("node-removed"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkCssNodeClass, node_removed),
NULL, NULL,
_gtk_marshal_VOID__OBJECT_OBJECT,
G_TYPE_NONE, 2,
GTK_TYPE_CSS_NODE, GTK_TYPE_CSS_NODE);
cssnode_signals[STYLE_CHANGED] =
g_signal_new (I_("style-changed"),
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkCssNodeClass, style_changed),
NULL, NULL,
_gtk_marshal_VOID__POINTER,
G_TYPE_NONE, 1,
G_TYPE_POINTER);
cssnode_properties[PROP_CLASSES] =
g_param_spec_boxed ("classes", "Classes",
"List of classes",
G_TYPE_STRV,
G_PARAM_READWRITE
| G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
cssnode_properties[PROP_ID] =
g_param_spec_string ("id", "ID",
"Unique ID",
NULL,
G_PARAM_READWRITE
| G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
cssnode_properties[PROP_NAME] =
g_param_spec_string ("name", "Name",
"Name identifying the type of node",
NULL,
G_PARAM_READWRITE
| G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
cssnode_properties[PROP_STATE] =
g_param_spec_flags ("state", "State",
"State flags",
GTK_TYPE_STATE_FLAGS,
0,
G_PARAM_READWRITE
| G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
cssnode_properties[PROP_VISIBLE] =
g_param_spec_boolean ("visible", "Visible",
"If other nodes can see this node",
TRUE,
G_PARAM_READWRITE
| G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
cssnode_properties[PROP_WIDGET_TYPE] =
g_param_spec_gtype ("widget-type", "Widget type",
"GType of the widget",
G_TYPE_NONE,
G_PARAM_READWRITE
| G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (object_class, NUM_PROPERTIES, cssnode_properties);
}
static void
gtk_css_node_init (GtkCssNode *cssnode)
{
cssnode->decl = gtk_css_node_declaration_new ();
cssnode->style = g_object_ref (gtk_css_static_style_get_default ());
cssnode->visible = TRUE;
}
/**
* gtk_css_node_new:
*
* Creates a new CSS node.
*
* Returns: (transfer full): the new CSS node
*/
GtkCssNode *
gtk_css_node_new (void)
{
return g_object_new (GTK_TYPE_CSS_NODE, NULL);
}
static GdkFrameClock *
gtk_css_node_get_frame_clock_or_null (GtkCssNode *cssnode)
{
while (cssnode->parent)
cssnode = cssnode->parent;
return GTK_CSS_NODE_GET_CLASS (cssnode)->get_frame_clock (cssnode);
}
static gint64
gtk_css_node_get_timestamp (GtkCssNode *cssnode)
{
GdkFrameClock *frameclock;
frameclock = gtk_css_node_get_frame_clock_or_null (cssnode);
if (frameclock == NULL)
return 0;
return gdk_frame_clock_get_frame_time (frameclock);
}
static void
gtk_css_node_parent_was_unset (GtkCssNode *node)
{
if (node->invalid)
GTK_CSS_NODE_GET_CLASS (node)->queue_validate (node);
}
static void
gtk_css_node_parent_will_be_set (GtkCssNode *node)
{
if (node->invalid)
GTK_CSS_NODE_GET_CLASS (node)->dequeue_validate (node);
}
static void
gtk_css_node_invalidate_style (GtkCssNode *cssnode)
{
if (cssnode->style_is_invalid)
return;
cssnode->style_is_invalid = TRUE;
gtk_css_node_set_invalid (cssnode, TRUE);
if (cssnode->first_child)
gtk_css_node_invalidate_style (cssnode->first_child);
if (cssnode->next_sibling)
gtk_css_node_invalidate_style (cssnode->next_sibling);
}
static void
gtk_css_node_reposition (GtkCssNode *node,
GtkCssNode *new_parent,
GtkCssNode *previous)
{
GtkCssNode *old_parent;
g_assert (! (new_parent == NULL && previous != NULL));
old_parent = node->parent;
/* Take a reference here so the whole function has a reference */
g_object_ref (node);
if (node->visible)
{
if (node->next_sibling)
gtk_css_node_invalidate (node->next_sibling,
GTK_CSS_CHANGE_ANY_SIBLING
| GTK_CSS_CHANGE_NTH_CHILD
| (node->previous_sibling ? 0 : GTK_CSS_CHANGE_FIRST_CHILD));
else if (node->previous_sibling)
gtk_css_node_invalidate (node->previous_sibling, GTK_CSS_CHANGE_LAST_CHILD);
}
if (old_parent != NULL)
{
g_signal_emit (old_parent, cssnode_signals[NODE_REMOVED], 0, node, node->previous_sibling);
if (old_parent->first_child && node->visible)
gtk_css_node_invalidate (old_parent->first_child, GTK_CSS_CHANGE_NTH_LAST_CHILD);
}
if (old_parent != new_parent)
{
if (old_parent == NULL)
{
gtk_css_node_parent_will_be_set (node);
}
else
{
g_object_unref (node);
}
if (gtk_css_node_get_style_provider_or_null (node) == NULL)
gtk_css_node_invalidate_style_provider (node);
gtk_css_node_invalidate (node, GTK_CSS_CHANGE_TIMESTAMP | GTK_CSS_CHANGE_ANIMATIONS);
if (new_parent)
{
g_object_ref (node);
if (node->pending_changes)
new_parent->needs_propagation = TRUE;
if (node->invalid && node->visible)
gtk_css_node_set_invalid (new_parent, TRUE);
}
else
{
gtk_css_node_parent_was_unset (node);
}
}
if (new_parent)
{
g_signal_emit (new_parent, cssnode_signals[NODE_ADDED], 0, node, previous);
if (node->visible)
gtk_css_node_invalidate (new_parent->first_child, GTK_CSS_CHANGE_NTH_LAST_CHILD);
}
if (node->visible)
{
if (node->next_sibling)
{
if (node->previous_sibling == NULL)
gtk_css_node_invalidate (node->next_sibling, GTK_CSS_CHANGE_FIRST_CHILD);
else
gtk_css_node_invalidate_style (node->next_sibling);
}
else if (node->previous_sibling)
{
gtk_css_node_invalidate (node->previous_sibling, GTK_CSS_CHANGE_LAST_CHILD);
}
}
else
{
if (node->next_sibling)
gtk_css_node_invalidate_style (node->next_sibling);
}
gtk_css_node_invalidate (node, GTK_CSS_CHANGE_ANY_PARENT
| GTK_CSS_CHANGE_ANY_SIBLING
| GTK_CSS_CHANGE_NTH_CHILD
| (node->previous_sibling ? 0 : GTK_CSS_CHANGE_FIRST_CHILD)
| (node->next_sibling ? 0 : GTK_CSS_CHANGE_LAST_CHILD));
g_object_unref (node);
}
void
gtk_css_node_set_parent (GtkCssNode *node,
GtkCssNode *parent)
{
if (node->parent == parent)
return;
gtk_css_node_reposition (node, parent, parent ? parent->last_child : NULL);
}
/* If previous_sibling is NULL, insert at the beginning */
void
gtk_css_node_insert_after (GtkCssNode *parent,
GtkCssNode *cssnode,
GtkCssNode *previous_sibling)
{
g_return_if_fail (previous_sibling == NULL || previous_sibling->parent == parent);
g_return_if_fail (cssnode != previous_sibling);
if (cssnode->previous_sibling == previous_sibling &&
cssnode->parent == parent)
return;
gtk_css_node_reposition (cssnode,
parent,
previous_sibling);
}
/* If next_sibling is NULL, insert at the end */
void
gtk_css_node_insert_before (GtkCssNode *parent,
GtkCssNode *cssnode,
GtkCssNode *next_sibling)
{
g_return_if_fail (next_sibling == NULL || next_sibling->parent == parent);
g_return_if_fail (cssnode != next_sibling);
if (cssnode->next_sibling == next_sibling &&
cssnode->parent == parent)
return;
gtk_css_node_reposition (cssnode,
parent,
next_sibling ? next_sibling->previous_sibling : parent->last_child);
}
void
gtk_css_node_reverse_children (GtkCssNode *cssnode)
{
GtkCssNode *end;
end = cssnode->last_child;
while (cssnode->first_child != end)
{
gtk_css_node_reposition (cssnode->first_child,
cssnode,
end);
}
}
GtkCssNode *
gtk_css_node_get_parent (GtkCssNode *cssnode)
{
return cssnode->parent;
}
GtkCssNode *
gtk_css_node_get_first_child (GtkCssNode *cssnode)
{
return cssnode->first_child;
}
GtkCssNode *
gtk_css_node_get_last_child (GtkCssNode *cssnode)
{
return cssnode->last_child;
}
GtkCssNode *
gtk_css_node_get_previous_sibling (GtkCssNode *cssnode)
{
return cssnode->previous_sibling;
}
GtkCssNode *
gtk_css_node_get_next_sibling (GtkCssNode *cssnode)
{
return cssnode->next_sibling;
}
static gboolean
gtk_css_node_set_style (GtkCssNode *cssnode,
GtkCssStyle *style)
{
GtkCssStyleChange change;
gboolean style_changed;
if (cssnode->style == style)
return FALSE;
gtk_css_style_change_init (&change, cssnode->style, style);
style_changed = gtk_css_style_change_has_change (&change);
if (style_changed)
{
g_signal_emit (cssnode, cssnode_signals[STYLE_CHANGED], 0, &change);
}
else if (cssnode->style != style &&
(GTK_IS_CSS_ANIMATED_STYLE (cssnode->style) || GTK_IS_CSS_ANIMATED_STYLE (style)))
{
/* This is when animations are starting/stopping but they didn't change any CSS this frame */
g_set_object (&cssnode->style, style);
}
gtk_css_style_change_finish (&change);
return style_changed;
}
static void
gtk_css_node_propagate_pending_changes (GtkCssNode *cssnode,
gboolean style_changed)
{
GtkCssChange change, child_change;
GtkCssNode *child;
change = _gtk_css_change_for_child (cssnode->pending_changes);
if (style_changed)
change |= GTK_CSS_CHANGE_PARENT_STYLE;
if (!cssnode->needs_propagation && change == 0)
return;
for (child = gtk_css_node_get_first_child (cssnode);
child;
child = gtk_css_node_get_next_sibling (child))
{
child_change = child->pending_changes;
gtk_css_node_invalidate (child, change);
if (child->visible)
change |= _gtk_css_change_for_sibling (child_change);
}
cssnode->needs_propagation = FALSE;
}
static gboolean
gtk_css_node_needs_new_style (GtkCssNode *cssnode)
{
return cssnode->style_is_invalid || cssnode->needs_propagation;
}
static void
gtk_css_node_ensure_style (GtkCssNode *cssnode,
gint64 current_time)
{
gboolean style_changed;
if (!gtk_css_node_needs_new_style (cssnode))
return;
if (cssnode->parent)
gtk_css_node_ensure_style (cssnode->parent, current_time);
if (cssnode->style_is_invalid)
{
GtkCssStyle *new_style;
if (cssnode->previous_sibling)
gtk_css_node_ensure_style (cssnode->previous_sibling, current_time);
new_style = GTK_CSS_NODE_GET_CLASS (cssnode)->update_style (cssnode,
cssnode->pending_changes,
current_time,
cssnode->style);
style_changed = gtk_css_node_set_style (cssnode, new_style);
g_object_unref (new_style);
if (!style_changed && (cssnode->pending_changes & GTK_CSS_CHANGE_SOURCE))
{
/* clear the global cache if we reuse the same style after the CSS changed */
g_object_set_qdata (G_OBJECT (cssnode->style), quark_global_cache, NULL);
}
}
else
{
style_changed = FALSE;
}
gtk_css_node_propagate_pending_changes (cssnode, style_changed);
cssnode->pending_changes = 0;
cssnode->style_is_invalid = FALSE;
}
GtkCssStyle *
gtk_css_node_get_style (GtkCssNode *cssnode)
{
if (gtk_css_node_needs_new_style (cssnode))
{
gint64 timestamp = gtk_css_node_get_timestamp (cssnode);
gtk_css_node_ensure_style (cssnode, timestamp);
}
return cssnode->style;
}
void
gtk_css_node_set_visible (GtkCssNode *cssnode,
gboolean visible)
{
GtkCssNode *iter;
if (cssnode->visible == visible)
return;
cssnode->visible = visible;
g_object_notify_by_pspec (G_OBJECT (cssnode), cssnode_properties[PROP_VISIBLE]);
if (cssnode->invalid)
{
if (cssnode->visible)
{
if (cssnode->parent)
gtk_css_node_set_invalid (cssnode->parent, TRUE);
else
GTK_CSS_NODE_GET_CLASS (cssnode)->queue_validate (cssnode);
}
else
{
if (cssnode->parent == NULL)
GTK_CSS_NODE_GET_CLASS (cssnode)->dequeue_validate (cssnode);
}
}
if (cssnode->next_sibling)
{
gtk_css_node_invalidate (cssnode->next_sibling, GTK_CSS_CHANGE_ANY_SIBLING | GTK_CSS_CHANGE_NTH_CHILD);
if (gtk_css_node_is_first_child (cssnode))
{
for (iter = cssnode->next_sibling;
iter != NULL;
iter = iter->next_sibling)
{
gtk_css_node_invalidate (iter, GTK_CSS_CHANGE_FIRST_CHILD);
if (iter->visible)
break;
}
}
}
if (cssnode->previous_sibling)
{
if (gtk_css_node_is_last_child (cssnode))
{
for (iter = cssnode->previous_sibling;
iter != NULL;
iter = iter->previous_sibling)
{
gtk_css_node_invalidate (iter, GTK_CSS_CHANGE_LAST_CHILD);
if (iter->visible)
break;
}
}
gtk_css_node_invalidate (cssnode->parent->first_child, GTK_CSS_CHANGE_NTH_LAST_CHILD);
}
}
gboolean
gtk_css_node_get_visible (GtkCssNode *cssnode)
{
return cssnode->visible;
}
void
gtk_css_node_set_name (GtkCssNode *cssnode,
/*interned*/ const char *name)
{
if (gtk_css_node_declaration_set_name (&cssnode->decl, name))
{
gtk_css_node_invalidate (cssnode, GTK_CSS_CHANGE_NAME);
g_object_notify_by_pspec (G_OBJECT (cssnode), cssnode_properties[PROP_NAME]);
g_object_notify_by_pspec (G_OBJECT (cssnode), cssnode_properties[PROP_WIDGET_TYPE]);
}
}
/* interned */ const char *
gtk_css_node_get_name (GtkCssNode *cssnode)
{
return gtk_css_node_declaration_get_name (cssnode->decl);
}
void
gtk_css_node_set_widget_type (GtkCssNode *cssnode,
GType widget_type)
{
if (gtk_css_node_declaration_set_type (&cssnode->decl, widget_type))
{
gtk_css_node_invalidate (cssnode, GTK_CSS_CHANGE_NAME);
g_object_notify_by_pspec (G_OBJECT (cssnode), cssnode_properties[PROP_NAME]);
g_object_notify_by_pspec (G_OBJECT (cssnode), cssnode_properties[PROP_WIDGET_TYPE]);
}
}
GType
gtk_css_node_get_widget_type (GtkCssNode *cssnode)
{
return gtk_css_node_declaration_get_type (cssnode->decl);
}
void
gtk_css_node_set_id (GtkCssNode *cssnode,
/* interned */ const char *id)
{
if (gtk_css_node_declaration_set_id (&cssnode->decl, id))
{
gtk_css_node_invalidate (cssnode, GTK_CSS_CHANGE_ID);
g_object_notify_by_pspec (G_OBJECT (cssnode), cssnode_properties[PROP_ID]);
}
}
/* interned */ const char *
gtk_css_node_get_id (GtkCssNode *cssnode)
{
return gtk_css_node_declaration_get_id (cssnode->decl);
}
void
gtk_css_node_set_state (GtkCssNode *cssnode,
GtkStateFlags state_flags)
{
if (gtk_css_node_declaration_set_state (&cssnode->decl, state_flags))
{
gtk_css_node_invalidate (cssnode, GTK_CSS_CHANGE_STATE);
g_object_notify_by_pspec (G_OBJECT (cssnode), cssnode_properties[PROP_STATE]);
}
}
GtkStateFlags
gtk_css_node_get_state (GtkCssNode *cssnode)
{
return gtk_css_node_declaration_get_state (cssnode->decl);
}
void
gtk_css_node_set_junction_sides (GtkCssNode *cssnode,
GtkJunctionSides junction_sides)
{
gtk_css_node_declaration_set_junction_sides (&cssnode->decl, junction_sides);
}
GtkJunctionSides
gtk_css_node_get_junction_sides (GtkCssNode *cssnode)
{
return gtk_css_node_declaration_get_junction_sides (cssnode->decl);
}
static void
gtk_css_node_clear_classes (GtkCssNode *cssnode)
{
if (gtk_css_node_declaration_clear_classes (&cssnode->decl))
{
gtk_css_node_invalidate (cssnode, GTK_CSS_CHANGE_CLASS);
g_object_notify_by_pspec (G_OBJECT (cssnode), cssnode_properties[PROP_CLASSES]);
}
}
void
gtk_css_node_set_classes (GtkCssNode *cssnode,
const char **classes)
{
guint i;
g_object_freeze_notify (G_OBJECT (cssnode));
gtk_css_node_clear_classes (cssnode);
if (classes)
{
for (i = 0; classes[i] != NULL; i++)
{
gtk_css_node_add_class (cssnode, g_quark_from_string (classes[i]));
}
}
g_object_thaw_notify (G_OBJECT (cssnode));
}
char **
gtk_css_node_get_classes (GtkCssNode *cssnode)
{
const GQuark *classes;
char **result;
guint n_classes, i, j;
classes = gtk_css_node_declaration_get_classes (cssnode->decl, &n_classes);
result = g_new (char *, n_classes + 1);
for (i = n_classes, j = 0; i-- > 0; ++j)
{
result[j] = g_strdup (g_quark_to_string (classes[i]));
}
result[n_classes] = NULL;
return result;
}
void
gtk_css_node_add_class (GtkCssNode *cssnode,
GQuark style_class)
{
if (gtk_css_node_declaration_add_class (&cssnode->decl, style_class))
{
gtk_css_node_invalidate (cssnode, GTK_CSS_CHANGE_CLASS);
g_object_notify_by_pspec (G_OBJECT (cssnode), cssnode_properties[PROP_CLASSES]);
}
}
void
gtk_css_node_remove_class (GtkCssNode *cssnode,
GQuark style_class)
{
if (gtk_css_node_declaration_remove_class (&cssnode->decl, style_class))
{
gtk_css_node_invalidate (cssnode, GTK_CSS_CHANGE_CLASS);
g_object_notify_by_pspec (G_OBJECT (cssnode), cssnode_properties[PROP_CLASSES]);
}
}
gboolean
gtk_css_node_has_class (GtkCssNode *cssnode,
GQuark style_class)
{
return gtk_css_node_declaration_has_class (cssnode->decl, style_class);
}
const GQuark *
gtk_css_node_list_classes (GtkCssNode *cssnode,
guint *n_classes)
{
return gtk_css_node_declaration_get_classes (cssnode->decl, n_classes);
}
void
gtk_css_node_add_region (GtkCssNode *cssnode,
GQuark region,
GtkRegionFlags flags)
{
gtk_css_node_declaration_add_region (&cssnode->decl, region, flags);
}
void
gtk_css_node_remove_region (GtkCssNode *cssnode,
GQuark region)
{
gtk_css_node_declaration_remove_region (&cssnode->decl, region);
}
gboolean
gtk_css_node_has_region (GtkCssNode *cssnode,
GQuark region,
GtkRegionFlags *out_flags)
{
return gtk_css_node_declaration_has_region (cssnode->decl, region, out_flags);
}
GList *
gtk_css_node_list_regions (GtkCssNode *cssnode)
{
return gtk_css_node_declaration_list_regions (cssnode->decl);
}
const GtkCssNodeDeclaration *
gtk_css_node_get_declaration (GtkCssNode *cssnode)
{
return cssnode->decl;
}
void
gtk_css_node_invalidate_style_provider (GtkCssNode *cssnode)
{
GtkCssNode *child;
gtk_css_node_invalidate (cssnode, GTK_CSS_CHANGE_SOURCE);
for (child = cssnode->first_child;
child;
child = child->next_sibling)
{
if (gtk_css_node_get_style_provider_or_null (child) == NULL)
gtk_css_node_invalidate_style_provider (child);
}
}
static void
gtk_css_node_invalidate_timestamp (GtkCssNode *cssnode)
{
GtkCssNode *child;
if (!cssnode->invalid)
return;
if (!gtk_css_style_is_static (cssnode->style))
gtk_css_node_invalidate (cssnode, GTK_CSS_CHANGE_TIMESTAMP);
for (child = cssnode->first_child; child; child = child->next_sibling)
{
gtk_css_node_invalidate_timestamp (child);
}
}
void
gtk_css_node_invalidate_frame_clock (GtkCssNode *cssnode,
gboolean just_timestamp)
{
/* frame clock is handled by the top level */
if (cssnode->parent)
return;
gtk_css_node_invalidate_timestamp (cssnode);
if (!just_timestamp)
gtk_css_node_invalidate (cssnode, GTK_CSS_CHANGE_ANIMATIONS);
}
void
gtk_css_node_invalidate (GtkCssNode *cssnode,
GtkCssChange change)
{
if (!cssnode->invalid)
change &= ~GTK_CSS_CHANGE_TIMESTAMP;
if (change == 0)
return;
cssnode->pending_changes |= change;
GTK_CSS_NODE_GET_CLASS (cssnode)->invalidate (cssnode);
if (cssnode->parent)
cssnode->parent->needs_propagation = TRUE;
gtk_css_node_invalidate_style (cssnode);
}
void
gtk_css_node_validate_internal (GtkCssNode *cssnode,
gint64 timestamp)
{
GtkCssNode *child;
/* If you run your application with
* GTK_DEBUG=no-css-cache
* every invalidation will purge the cache and completely query
* everything anew form the cache. This is slow (in particular
* when animating), but useful for figuring out bugs.
*
* We achieve that by pretending that everything that could have
* changed has and so we of course totally need to redo everything.
*
* Note that this also completely revalidates child widgets all
* the time.
*/
#ifdef G_ENABLE_DEBUG
if (GTK_DEBUG_CHECK (NO_CSS_CACHE))
cssnode->pending_changes |= GTK_CSS_CHANGE_ANY;
#endif
if (!cssnode->invalid)
return;
gtk_css_node_ensure_style (cssnode, timestamp);
/* need to set to FALSE then to TRUE here to make it chain up */
gtk_css_node_set_invalid (cssnode, FALSE);
if (!gtk_css_style_is_static (cssnode->style))
gtk_css_node_set_invalid (cssnode, TRUE);
GTK_CSS_NODE_GET_CLASS (cssnode)->validate (cssnode);
for (child = gtk_css_node_get_first_child (cssnode);
child;
child = gtk_css_node_get_next_sibling (child))
{
if (child->visible)
gtk_css_node_validate_internal (child, timestamp);
}
}
void
gtk_css_node_validate (GtkCssNode *cssnode)
{
gint64 timestamp;
timestamp = gtk_css_node_get_timestamp (cssnode);
gtk_css_node_validate_internal (cssnode, timestamp);
}
gboolean
gtk_css_node_init_matcher (GtkCssNode *cssnode,
GtkCssMatcher *matcher)
{
return GTK_CSS_NODE_GET_CLASS (cssnode)->init_matcher (cssnode, matcher);
}
GtkWidgetPath *
gtk_css_node_create_widget_path (GtkCssNode *cssnode)
{
return GTK_CSS_NODE_GET_CLASS (cssnode)->create_widget_path (cssnode);
}
const GtkWidgetPath *
gtk_css_node_get_widget_path (GtkCssNode *cssnode)
{
return GTK_CSS_NODE_GET_CLASS (cssnode)->get_widget_path (cssnode);
}
GtkStyleProviderPrivate *
gtk_css_node_get_style_provider (GtkCssNode *cssnode)
{
GtkStyleProviderPrivate *result;
result = gtk_css_node_get_style_provider_or_null (cssnode);
if (result)
return result;
if (cssnode->parent)
return gtk_css_node_get_style_provider (cssnode->parent);
return GTK_STYLE_PROVIDER_PRIVATE (_gtk_settings_get_style_cascade (gtk_settings_get_default (), 1));
}
static void
append_id (GtkCssNode *cssnode,
GString *string)
{
const char *id;
id = gtk_css_node_get_id (cssnode);
if (id)
{
g_string_append (string, " id=");
g_string_append (string, id);
}
}
static void
append_visible (GtkCssNode *cssnode,
GString *string)
{
g_string_append_printf (string, " visible=%d", gtk_css_node_get_visible (cssnode));
}
static void
append_state (GtkCssNode *cssnode,
GString *string)
{
GtkStateFlags state;
state = gtk_css_node_get_state (cssnode);
if (state)
{
GFlagsClass *fclass;
gint i;
gboolean first = TRUE;
g_string_append (string, " state=");
fclass = g_type_class_ref (GTK_TYPE_STATE_FLAGS);
for (i = 0; i < fclass->n_values; i++)
{
if (state & fclass->values[i].value)
{
if (first)
first = FALSE;
else
g_string_append_c (string, '|');
g_string_append (string, fclass->values[i].value_nick);
}
}
g_type_class_unref (fclass);
}
}
static void
append_classes (GtkCssNode *cssnode,
GString *string)
{
const GQuark *classes;
guint n_classes;
classes = gtk_css_node_list_classes (cssnode, &n_classes);
if (n_classes > 0)
{
int i;
g_string_append (string, " classes=");
for (i = 0; i < n_classes; i++)
{
if (i > 0)
g_string_append_c (string, ',');
g_string_append (string, g_quark_to_string (classes[i]));
}
}
}
static gboolean
gtk_css_node_has_initial_value (GtkCssNode *cssnode,
GtkCssStyleProperty *prop)
{
GtkCssNode *parent_node;
GtkCssStyle *style, *parent_style;
GtkCssValue *value, *initial, *computed;
GtkCssProvider *provider;
gboolean is_initial;
guint id;
id = _gtk_css_style_property_get_id (prop);
style = gtk_css_node_get_style (cssnode);
value = gtk_css_style_get_value (style, id);
parent_node = gtk_css_node_get_parent (cssnode);
parent_style = parent_node ? gtk_css_node_get_style (parent_node) : NULL;
provider = gtk_css_node_get_style_provider (cssnode);
initial = _gtk_css_style_property_get_initial_value (prop);
computed = _gtk_css_value_compute (initial, id, provider, style, parent_style);
is_initial = _gtk_css_value_equal (value, computed);
_gtk_css_value_unref (computed);
return is_initial;
}
static void
append_value (GtkCssNode *cssnode,
GtkCssStyleProperty *prop,
GString *string,
guint indent)
{
GtkCssValue *value;
GtkCssStyle *style;
GtkCssSection *section;
const char *name;
guint id;
id = _gtk_css_style_property_get_id (prop);
name = _gtk_style_property_get_name (GTK_STYLE_PROPERTY (prop));
style = gtk_css_node_get_style (cssnode);
value = gtk_css_style_get_value (style, id);
g_string_append_printf (string, "%*s%s: ", indent, "", name);
_gtk_css_value_print (value, string);
section = gtk_css_style_get_section (style, id);
if (section)
{
g_string_append (string, " (");
_gtk_css_section_print (section, string);
g_string_append (string, ")");
}
g_string_append_c (string, '\n');
}
static void
append_style (GtkCssNode *cssnode,
GtkStyleContextPrintFlags flags,
GString *string,
guint indent)
{
int i;
if (!(flags & GTK_STYLE_CONTEXT_PRINT_SHOW_STYLE))
return;
for (i = 0; i < _gtk_css_style_property_get_n_properties (); i++)
{
GtkCssStyleProperty *prop;
prop = _gtk_css_style_property_lookup_by_id (i);
if ((flags & GTK_STYLE_CONTEXT_PRINT_SHOW_INITIAL) ||
!gtk_css_node_has_initial_value (cssnode, prop))
append_value (cssnode, prop, string, indent);
}
}
void
gtk_css_node_print (GtkCssNode *cssnode,
GtkStyleContextPrintFlags flags,
GString *string,
guint indent)
{
GtkCssNode *node;
g_string_append_printf (string, "%*s", indent, "");
if (gtk_css_node_get_name (cssnode))
g_string_append (string, gtk_css_node_get_name (cssnode));
else
g_string_append (string, g_type_name (gtk_css_node_get_widget_type (cssnode)));
append_id (cssnode, string);
append_visible (cssnode, string);
append_state (cssnode, string);
append_classes (cssnode, string);
g_string_append_c (string, '\n');
append_style (cssnode, flags, string, indent + 2);
if (flags & GTK_STYLE_CONTEXT_PRINT_RECURSE)
{
for (node = gtk_css_node_get_first_child (cssnode); node; node = gtk_css_node_get_next_sibling (node))
gtk_css_node_print (node, flags, string, indent + 2);
}
}
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