forked from AuroraMiddleware/gtk
228 lines
7.5 KiB
C
228 lines
7.5 KiB
C
/* GTK - The GIMP Toolkit
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* Copyright (C) 2011 Benjamin Otte <otte@gnome.org>
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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 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
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include "gtkcsslookupprivate.h"
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#include "gtkcsstypesprivate.h"
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#include "gtkprivatetypebuiltins.h"
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#include "gtkcssstylepropertyprivate.h"
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#include "gtkstylepropertiesprivate.h"
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typedef struct {
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GtkCssSection *section;
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const GValue *value;
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} GtkCssLookupValue;
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struct _GtkCssLookup {
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GtkBitmask *missing;
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GtkCssLookupValue values[1];
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};
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GtkCssLookup *
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_gtk_css_lookup_new (void)
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{
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GtkCssLookup *lookup;
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guint n = _gtk_css_style_property_get_n_properties ();
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lookup = g_malloc0 (sizeof (GtkCssLookup) + sizeof (GtkCssLookupValue) * n);
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lookup->missing = _gtk_bitmask_new ();
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_gtk_bitmask_invert_range (lookup->missing, 0, n);
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return lookup;
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}
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void
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_gtk_css_lookup_free (GtkCssLookup *lookup)
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{
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g_return_if_fail (lookup != NULL);
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_gtk_bitmask_free (lookup->missing);
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g_free (lookup);
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}
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const GtkBitmask *
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_gtk_css_lookup_get_missing (const GtkCssLookup *lookup)
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{
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g_return_val_if_fail (lookup != NULL, NULL);
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return lookup->missing;
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}
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gboolean
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_gtk_css_lookup_is_missing (const GtkCssLookup *lookup,
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guint id)
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{
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g_return_val_if_fail (lookup != NULL, FALSE);
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return lookup->values[id].value == NULL;
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}
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/**
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* _gtk_css_lookup_set:
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* @lookup: the lookup
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* @id: id of the property to set, see _gtk_style_property_get_id()
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* @section: (allow-none): The @section the value was defined in or %NULL
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* @value: the "cascading value" to use
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*
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* Sets the @value for a given @id. No value may have been set for @id
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* before. See _gtk_css_lookup_is_missing(). This function is used to
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* set the "winning declaration" of a lookup. Note that for performance
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* reasons @value and @section are not copied. It is your responsibility
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* to ensure they are kept alive until _gtk_css_lookup_free() is called.
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**/
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void
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_gtk_css_lookup_set (GtkCssLookup *lookup,
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guint id,
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GtkCssSection *section,
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const GValue *value)
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{
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g_return_if_fail (lookup != NULL);
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g_return_if_fail (_gtk_bitmask_get (lookup->missing, id));
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g_return_if_fail (value != NULL);
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_gtk_bitmask_set (lookup->missing, id, FALSE);
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lookup->values[id].value = value;
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lookup->values[id].section = section;
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}
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/**
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* _gtk_css_lookup_resolve:
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* @lookup: the lookup
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* @parent: the parent properties to look up inherited values from or %NULL
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* if none
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*
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* Resolves the current lookup into a styleproperties object. This is done
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* by converting from the "winning declaration" to the "computed value".
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*
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* XXX: This bypasses the notion of "specified value". If this ever becomes
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* an issue, go fix it.
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*
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* Returns: a new #GtkStyleProperties
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**/
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GtkStyleProperties *
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_gtk_css_lookup_resolve (GtkCssLookup *lookup,
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GtkStyleContext *parent)
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{
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GtkStyleProperties *props;
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guint i, n;
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g_return_val_if_fail (lookup != NULL, NULL);
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g_return_val_if_fail (parent == NULL || GTK_IS_STYLE_CONTEXT (parent), NULL);
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n = _gtk_css_style_property_get_n_properties ();
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props = gtk_style_properties_new ();
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for (i = 0; i < n; i++)
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{
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GtkCssStyleProperty *prop = _gtk_css_style_property_lookup_by_id (i);
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const GValue *result;
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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 (lookup->values[i].value != NULL)
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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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if (!G_VALUE_HOLDS (lookup->values[i].value, GTK_TYPE_CSS_SPECIAL_VALUE))
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{
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result = lookup->values[i].value;
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}
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else
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{
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switch (g_value_get_enum (lookup->values[i].value))
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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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result = 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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result = _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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result = lookup->values[i].value;
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break;
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}
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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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result = 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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result = _gtk_css_style_property_get_initial_value (prop);
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}
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}
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if (result)
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{
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_gtk_style_properties_set_property_by_property (props,
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prop,
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0,
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result);
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}
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else if (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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_gtk_style_properties_set_property_by_property (props,
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prop,
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0,
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_gtk_css_style_property_get_initial_value (prop));
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}
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else
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{
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GValue value = { 0, };
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/* Set NULL here and do the inheritance upon lookup? */
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gtk_style_context_get_property (parent,
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_gtk_style_property_get_name (GTK_STYLE_PROPERTY (prop)),
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gtk_style_context_get_state (parent),
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&value);
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_gtk_style_properties_set_property_by_property (props,
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prop,
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0,
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&value);
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g_value_unset (&value);
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}
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}
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return props;
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}
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