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gtk2/gtk/gtkcssnode.c
Matthias Clasen 5fa027ab8a cssnode: Drop the node-added/-removed signals 
These are no longer used, and the children-observer
listmodel is a better approach for monitoring the
children.
2022-10-07 17:21:04 -04:00

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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;
if (parent->children_observer)
gtk_list_list_model_item_removed (parent->children_observer, previous);
}
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->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)
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,
GtkStyleContextPrintFlags 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_STYLE_CONTEXT_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_STYLE_CONTEXT_PRINT_SHOW_STYLE)
need_newline = gtk_css_style_print (gtk_css_node_get_style (cssnode), string, indent + 2, TRUE);
if (flags & GTK_STYLE_CONTEXT_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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