css: Introduce GtkCssComputedValues
To be used for storing computed values. Is the replacement for GtkStyleProperties, which is now legacy code.
This commit is contained in:
Benjamin Otte
233
gtk/gtkcsscomputedvalues.c
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233
gtk/gtkcsscomputedvalues.c
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/*
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* Copyright © 2012 Red Hat Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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#include "config.h"
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#include "gtkcsscomputedvaluesprivate.h"
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#include "gtkcssstylepropertyprivate.h"
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#include "gtkcsstypesprivate.h"
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#include "gtkprivatetypebuiltins.h"
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G_DEFINE_TYPE (GtkCssComputedValues, _gtk_css_computed_values, G_TYPE_OBJECT)
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static void
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gtk_css_computed_values_dispose (GObject *object)
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{
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GtkCssComputedValues *values = GTK_CSS_COMPUTED_VALUES (object);
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if (values->values)
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{
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g_value_array_free (values->values);
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values->values = NULL;
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}
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if (values->sections)
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{
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g_ptr_array_unref (values->sections);
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values->sections = NULL;
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}
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G_OBJECT_CLASS (_gtk_css_computed_values_parent_class)->dispose (object);
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}
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static void
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_gtk_css_computed_values_class_init (GtkCssComputedValuesClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->dispose = gtk_css_computed_values_dispose;
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}
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static void
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_gtk_css_computed_values_init (GtkCssComputedValues *computed_values)
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{
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}
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GtkCssComputedValues *
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_gtk_css_computed_values_new (void)
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{
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return g_object_new (GTK_TYPE_CSS_COMPUTED_VALUES, NULL);
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}
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static void
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maybe_unref_section (gpointer section)
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{
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if (section)
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gtk_css_section_unref (section);
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}
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void
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_gtk_css_computed_values_compute_value (GtkCssComputedValues *values,
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GtkStyleContext *context,
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guint id,
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const GValue *specified,
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GtkCssSection *section)
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{
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GtkCssStyleProperty *prop;
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GtkStyleContext *parent;
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g_return_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values));
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g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
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g_return_if_fail (specified == NULL || G_IS_VALUE (specified));
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prop = _gtk_css_style_property_lookup_by_id (id);
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parent = gtk_style_context_get_parent (context);
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if (values->values == NULL)
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values->values = g_value_array_new (id + 1);
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while (values->values->n_values <= id)
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g_value_array_append (values->values, NULL);
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/* http://www.w3.org/TR/css3-cascade/#cascade
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* Then, for every element, the value for each property can be found
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* by following this pseudo-algorithm:
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* 1) Identify all declarations that apply to the element
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*/
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if (specified != NULL)
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{
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if (G_VALUE_HOLDS (specified, GTK_TYPE_CSS_SPECIAL_VALUE))
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{
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switch (g_value_get_enum (specified))
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{
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case GTK_CSS_INHERIT:
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/* 3) if the value of the winning declaration is ‘inherit’,
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* the inherited value (see below) becomes the specified value.
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*/
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specified = NULL;
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break;
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case GTK_CSS_INITIAL:
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/* if the value of the winning declaration is ‘initial’,
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* the initial value (see below) becomes the specified value.
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*/
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specified = _gtk_css_style_property_get_initial_value (prop);
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break;
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default:
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/* This is part of (2) above */
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break;
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}
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}
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/* 2) If the cascading process (described below) yields a winning
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* declaration and the value of the winning declaration is not
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* ‘initial’ or ‘inherit’, the value of the winning declaration
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* becomes the specified value.
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*/
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}
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else
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{
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if (_gtk_css_style_property_is_inherit (prop))
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{
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/* 4) if the property is inherited, the inherited value becomes
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* the specified value.
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*/
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specified = NULL;
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}
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else
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{
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/* 5) Otherwise, the initial value becomes the specified value.
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*/
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specified = _gtk_css_style_property_get_initial_value (prop);
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}
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}
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if (specified == NULL && parent == NULL)
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{
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/* If the ‘inherit’ value is set on the root element, the property is
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* assigned its initial value. */
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specified = _gtk_css_style_property_get_initial_value (prop);
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}
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if (specified)
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{
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_gtk_css_style_property_compute_value (prop,
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g_value_array_get_nth (values->values, id),
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context,
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specified);
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}
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else
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{
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const GValue *parent_value;
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GValue *value = g_value_array_get_nth (values->values, id);
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/* Set NULL here and do the inheritance upon lookup? */
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parent_value = _gtk_style_context_peek_property (parent,
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_gtk_style_property_get_name (GTK_STYLE_PROPERTY (prop)));
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g_value_init (value, G_VALUE_TYPE (parent_value));
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g_value_copy (parent_value, value);
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}
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if (section)
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{
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if (values->sections == NULL)
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values->sections = g_ptr_array_new_with_free_func (maybe_unref_section);
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if (values->sections->len <= id)
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g_ptr_array_set_size (values->sections, id + 1);
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g_ptr_array_index (values->sections, id) = gtk_css_section_ref (section);
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}
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}
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const GValue *
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_gtk_css_computed_values_get_value (GtkCssComputedValues *values,
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guint id)
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{
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const GValue *v;
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g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
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if (values->values == NULL ||
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id >= values->values->n_values)
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return NULL;
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v = g_value_array_get_nth (values->values, id);
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if (!G_IS_VALUE (v))
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return NULL;
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return v;
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}
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const GValue *
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_gtk_css_computed_values_get_value_by_name (GtkCssComputedValues *values,
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const char *name)
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{
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GtkStyleProperty *prop;
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g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
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g_return_val_if_fail (name != NULL, NULL);
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prop = _gtk_style_property_lookup (name);
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g_assert (GTK_IS_CSS_STYLE_PROPERTY (prop));
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return _gtk_css_computed_values_get_value (values, _gtk_css_style_property_get_id (GTK_CSS_STYLE_PROPERTY (prop)));
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}
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GtkCssSection *
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_gtk_css_computed_values_get_section (GtkCssComputedValues *values,
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guint id)
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{
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g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
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if (values->sections == NULL ||
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id >= values->sections->len)
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return NULL;
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return g_ptr_array_index (values->sections, id);
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}
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