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gtk2/gtk/gtkcssnode.c
Benjamin Otte ac8e053ab6 cssnode: Don't crash the inspector 
Don't misinform the observing listmodel that CSS nodes were removed that
weren't actually removed, but just moved. Otherwise the observer would
think it has run out of items when it really hasn't.
2023-03-05 18:33:37 +01:00

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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 "gtkcssstaticstyleprivate.h"
#include "gtkcssanimatedstyleprivate.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkmarshalers.h"
#include "gtksettingsprivate.h"
#include "gtktypebuiltins.h"
#include "gtkprivate.h"
#include "gdkprofilerprivate.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 laid 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_PARENT_ID | GTK_CSS_CHANGE_PARENT_NAME | GTK_CSS_CHANGE_PARENT_CLASS | \
GTK_CSS_CHANGE_SOURCE | GTK_CSS_CHANGE_PARENT_STYLE)
/* When these change, we need to recompute the change flags for the new style
* since they may have changed.
*/
#define GTK_CSS_CHANGE_NEEDS_RECOMPUTE (GTK_CSS_RADICAL_CHANGE & ~GTK_CSS_CHANGE_PARENT_STYLE)
G_DEFINE_TYPE (GtkCssNode, gtk_css_node, G_TYPE_OBJECT)
enum {
STYLE_CHANGED,
LAST_SIGNAL
};
enum {
PROP_0,
PROP_CLASSES,
PROP_ID,
PROP_NAME,
PROP_STATE,
PROP_VISIBLE,
NUM_PROPERTIES
};
static guint cssnode_signals[LAST_SIGNAL] = { 0 };
static GParamSpec *cssnode_properties[NUM_PROPERTIES];
static GtkStyleProvider *
gtk_css_node_get_style_provider_or_null (GtkCssNode *cssnode)
{
return GTK_CSS_NODE_GET_CLASS (cssnode)->get_style_provider (cssnode);
}
static int invalidated_nodes;
static int created_styles;
static guint invalidated_nodes_counter;
static guint created_styles_counter;
static void
gtk_css_node_set_invalid (GtkCssNode *node,
gboolean invalid)
{
if (node->invalid == invalid)
return;
node->invalid = invalid;
if (invalid)
invalidated_nodes++;
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, g_quark_to_string (gtk_css_node_get_id (cssnode)));
break;
case PROP_NAME:
g_value_set_string (value, g_quark_to_string (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;
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_quark_from_string (g_value_get_string (value)));
break;
case PROP_NAME:
gtk_css_node_set_name (cssnode, g_quark_from_string (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;
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_clear_pointer (&cssnode->cache, gtk_css_node_style_cache_unref);
if (cssnode->children_observer)
gtk_list_list_model_clear (cssnode->children_observer);
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;
}
static gboolean
may_use_global_parent_cache (GtkCssNode *node)
{
GtkStyleProvider *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,
const GtkCssNodeDeclaration *decl)
{
GtkCssNode *parent;
parent = node->parent;
if (parent == NULL ||
!may_use_global_parent_cache (node))
return NULL;
if (parent->cache == NULL)
return NULL;
g_assert (node->cache == NULL);
node->cache = gtk_css_node_style_cache_lookup (parent->cache,
decl,
gtk_css_node_is_first_child (node),
gtk_css_node_is_last_child (node));
if (node->cache == NULL)
return NULL;
return gtk_css_node_style_cache_get_style (node->cache);
}
static void
store_in_global_parent_cache (GtkCssNode *node,
const GtkCssNodeDeclaration *decl,
GtkCssStyle *style)
{
GtkCssNode *parent;
g_assert (GTK_IS_CSS_STATIC_STYLE (style));
parent = node->parent;
if (parent == NULL ||
!may_use_global_parent_cache (node))
return;
if (parent->cache == NULL)
parent->cache = gtk_css_node_style_cache_new (parent->style);
node->cache = gtk_css_node_style_cache_insert (parent->cache,
(GtkCssNodeDeclaration *) decl,
gtk_css_node_is_first_child (node),
gtk_css_node_is_last_child (node),
style);
}
static GtkCssStyle *
gtk_css_node_create_style (GtkCssNode *cssnode,
const GtkCountingBloomFilter *filter,
GtkCssChange change)
{
const GtkCssNodeDeclaration *decl;
GtkCssStyle *style;
GtkCssChange style_change;
decl = gtk_css_node_get_declaration (cssnode);
style = lookup_in_global_parent_cache (cssnode, decl);
if (style)
return g_object_ref (style);
created_styles++;
if (change & GTK_CSS_CHANGE_NEEDS_RECOMPUTE)
{
/* Need to recompute the change flags */
style_change = 0;
}
else
{
style_change = gtk_css_static_style_get_change (gtk_css_style_get_static_style (cssnode->style));
}
style = gtk_css_static_style_new_compute (gtk_css_node_get_style_provider (cssnode),
filter,
cssnode,
style_change);
store_in_global_parent_cache (cssnode, 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)
{
gtk_internal_return_val_if_fail (GTK_IS_CSS_STATIC_STYLE (style), TRUE);
/* Try to avoid invalidating if we can */
if (change & GTK_CSS_RADICAL_CHANGE)
return TRUE;
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,
const GtkCountingBloomFilter *filter,
GtkCssChange change,
gint64 timestamp,
GtkCssStyle *style)
{
GtkCssStyle *static_style, *new_static_style, *new_style;
static_style = GTK_CSS_STYLE (gtk_css_style_get_static_style (style));
if (gtk_css_style_needs_recreation (static_style, change))
new_static_style = gtk_css_node_create_style (cssnode, filter, change);
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);
/* Clear the cache again, the static style we looked up above
* may have populated it. */
g_clear_pointer (&cssnode->cache, gtk_css_node_style_cache_unref);
}
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_queue_validate (GtkCssNode *node)
{
}
static void
gtk_css_node_real_dequeue_validate (GtkCssNode *node)
{
}
static void
gtk_css_node_real_validate (GtkCssNode *node)
{
}
static GtkStyleProvider *
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);
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->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->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[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,
NULL,
G_TYPE_NONE, 1,
G_TYPE_POINTER);
cssnode_properties[PROP_CLASSES] =
g_param_spec_boxed ("classes", NULL, NULL,
G_TYPE_STRV,
G_PARAM_READWRITE
| G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
cssnode_properties[PROP_ID] =
g_param_spec_string ("id", NULL, NULL,
NULL,
G_PARAM_READWRITE
| G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
cssnode_properties[PROP_NAME] =
g_param_spec_string ("name", NULL, NULL,
NULL,
G_PARAM_READWRITE
| G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
cssnode_properties[PROP_STATE] =
g_param_spec_flags ("state", NULL, NULL,
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", NULL, NULL,
TRUE,
G_PARAM_READWRITE
| G_PARAM_EXPLICIT_NOTIFY | G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (object_class, NUM_PROPERTIES, cssnode_properties);
if (invalidated_nodes_counter == 0)
{
invalidated_nodes_counter = gdk_profiler_define_int_counter ("invalidated-nodes", "CSS Node Invalidations");
created_styles_counter = gdk_profiler_define_int_counter ("created-styles", "CSS Style Creations");
}
}
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->visible && node->invalid)
GTK_CSS_NODE_GET_CLASS (node)->queue_validate (node);
}
static void
gtk_css_node_parent_will_be_set (GtkCssNode *node)
{
if (node->visible && 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;
GtkCssNode *old_previous;
g_assert (! (new_parent == NULL && previous != NULL));
old_parent = node->parent;
old_previous = node->previous_sibling;
/* 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)
{
GTK_CSS_NODE_GET_CLASS (old_parent)->node_removed (old_parent, node, node->previous_sibling);
if (old_parent->children_observer && old_parent != new_parent)
gtk_list_list_model_item_removed (old_parent->children_observer, previous);
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)
{
GTK_CSS_NODE_GET_CLASS (new_parent)->node_added (new_parent, 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, (old_parent != new_parent ? GTK_CSS_CHANGE_ANY_PARENT : 0)
| 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));
if (new_parent && new_parent->children_observer)
{
if (old_previous && old_parent == new_parent)
gtk_list_list_model_item_moved (new_parent->children_observer, node, old_previous);
else
gtk_list_list_model_item_added (new_parent->children_observer, node);
}
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);
}
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 (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);
}
else if (gtk_css_static_style_get_change (gtk_css_style_get_static_style (cssnode->style)) !=
gtk_css_static_style_get_change (gtk_css_style_get_static_style (style)))
{
/* This is when we recomputed the change flags but the style didn't change */
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_do_ensure_style (GtkCssNode *cssnode,
const GtkCountingBloomFilter *filter,
gint64 current_time)
{
gboolean style_changed;
if (cssnode->style_is_invalid)
{
GtkCssStyle *new_style;
g_clear_pointer (&cssnode->cache, gtk_css_node_style_cache_unref);
new_style = GTK_CSS_NODE_GET_CLASS (cssnode)->update_style (cssnode,
filter,
cssnode->pending_changes,
current_time,
cssnode->style);
style_changed = gtk_css_node_set_style (cssnode, new_style);
g_object_unref (new_style);
}
else
{
style_changed = FALSE;
}
gtk_css_node_propagate_pending_changes (cssnode, style_changed);
cssnode->pending_changes = 0;
cssnode->style_is_invalid = FALSE;
}
static void
gtk_css_node_ensure_style (GtkCssNode *cssnode,
const GtkCountingBloomFilter *filter,
gint64 current_time)
{
GtkCssNode *sibling;
if (!gtk_css_node_needs_new_style (cssnode))
return;
if (cssnode->parent)
gtk_css_node_ensure_style (cssnode->parent, filter, current_time);
/* Ensure all siblings before this have a valid style, in order
* starting at the first that needs it. */
sibling = cssnode;
while (sibling->style_is_invalid &&
sibling->previous_sibling != NULL &&
gtk_css_node_needs_new_style (sibling->previous_sibling))
sibling = sibling->previous_sibling;
while (sibling != cssnode)
{
gtk_css_node_do_ensure_style (sibling, filter, current_time);
sibling = sibling->next_sibling;
}
gtk_css_node_do_ensure_style (cssnode, filter, current_time);
}
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, NULL, 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,
GQuark 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]);
}
}
GQuark
gtk_css_node_get_name (GtkCssNode *cssnode)
{
return gtk_css_node_declaration_get_name (cssnode->decl);
}
void
gtk_css_node_set_id (GtkCssNode *cssnode,
GQuark 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]);
}
}
GQuark
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)
{
GtkStateFlags old_state;
old_state = gtk_css_node_declaration_get_state (cssnode->decl);
if (gtk_css_node_declaration_set_state (&cssnode->decl, state_flags))
{
GtkStateFlags states = old_state ^ state_flags;
GtkCssChange change = 0;
if (states & GTK_STATE_FLAG_PRELIGHT)
change |= GTK_CSS_CHANGE_HOVER;
if (states & GTK_STATE_FLAG_INSENSITIVE)
change |= GTK_CSS_CHANGE_DISABLED;
if (states & GTK_STATE_FLAG_BACKDROP)
change |= GTK_CSS_CHANGE_BACKDROP;
if (states & GTK_STATE_FLAG_SELECTED)
change |= GTK_CSS_CHANGE_SELECTED;
if (states & ~(GTK_STATE_FLAG_PRELIGHT |
GTK_STATE_FLAG_INSENSITIVE |
GTK_STATE_FLAG_BACKDROP |
GTK_STATE_FLAG_SELECTED))
change |= GTK_CSS_CHANGE_STATE;
gtk_css_node_invalidate (cssnode, change);
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);
}
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);
}
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;
if (cssnode->parent)
cssnode->parent->needs_propagation = TRUE;
gtk_css_node_invalidate_style (cssnode);
}
static void
gtk_css_node_validate_internal (GtkCssNode *cssnode,
GtkCountingBloomFilter *filter,
gint64 timestamp)
{
GtkCssNode *child;
gboolean bloomed = FALSE;
if (!cssnode->invalid)
return;
gtk_css_node_ensure_style (cssnode, filter, 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)
continue;
if (!bloomed)
{
gtk_css_node_declaration_add_bloom_hashes (cssnode->decl, filter);
bloomed = TRUE;
}
gtk_css_node_validate_internal (child, filter, timestamp);
}
if (bloomed)
gtk_css_node_declaration_remove_bloom_hashes (cssnode->decl, filter);
}
void
gtk_css_node_validate (GtkCssNode *cssnode)
{
GtkCountingBloomFilter filter = GTK_COUNTING_BLOOM_FILTER_INIT;
gint64 timestamp;
gint64 before G_GNUC_UNUSED;
before = GDK_PROFILER_CURRENT_TIME;
g_assert (cssnode->parent == NULL);
timestamp = gtk_css_node_get_timestamp (cssnode);
gtk_css_node_validate_internal (cssnode, &filter, timestamp);
if (GDK_PROFILER_IS_RUNNING)
{
gdk_profiler_end_mark (before, "css validation", "");
gdk_profiler_set_int_counter (invalidated_nodes_counter, invalidated_nodes);
gdk_profiler_set_int_counter (created_styles_counter, created_styles);
invalidated_nodes = 0;
created_styles = 0;
}
}
GtkStyleProvider *
gtk_css_node_get_style_provider (GtkCssNode *cssnode)
{
GtkStyleProvider *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 (_gtk_settings_get_style_cascade (gtk_settings_get_default (), 1));
}
void
gtk_css_node_print (GtkCssNode *cssnode,
GtkCssNodePrintFlags flags,
GString *string,
guint indent)
{
gboolean need_newline = FALSE;
g_string_append_printf (string, "%*s", indent, "");
if (!cssnode->visible)
g_string_append_c (string, '[');
gtk_css_node_declaration_print (cssnode->decl, string);
if (!cssnode->visible)
g_string_append_c (string, ']');
if (flags & GTK_CSS_NODE_PRINT_SHOW_CHANGE)
{
GtkCssStyle *style = gtk_css_node_get_style (cssnode);
GtkCssChange change;
change = gtk_css_static_style_get_change (gtk_css_style_get_static_style (style));
g_string_append (string, " ");
gtk_css_change_print (change, string);
}
g_string_append_c (string, '\n');
if (flags & GTK_CSS_NODE_PRINT_SHOW_STYLE)
need_newline = gtk_css_style_print (gtk_css_node_get_style (cssnode), string, indent + 2, TRUE);
if (flags & GTK_CSS_NODE_PRINT_RECURSE)
{
GtkCssNode *node;
if (need_newline && gtk_css_node_get_first_child (cssnode))
g_string_append_c (string, '\n');
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);
}
}
static void
gtk_css_node_child_observer_destroyed (gpointer cssnode)
{
GTK_CSS_NODE (cssnode)->children_observer = NULL;
}
GListModel *
gtk_css_node_observe_children (GtkCssNode *cssnode)
{
if (cssnode->children_observer)
return g_object_ref (G_LIST_MODEL (cssnode->children_observer));
cssnode->children_observer = gtk_list_list_model_new ((gpointer) gtk_css_node_get_first_child,
(gpointer) gtk_css_node_get_next_sibling,
(gpointer) gtk_css_node_get_previous_sibling,
(gpointer) gtk_css_node_get_last_child,
(gpointer) g_object_ref,
cssnode,
gtk_css_node_child_observer_destroyed);
return G_LIST_MODEL (cssnode->children_observer);
}
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