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/* GTK - The GIMP Toolkit
* Copyright (C) 2011 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, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "gtkcsslookupprivate.h"
#include "gtkcsstypesprivate.h"
#include "gtkprivatetypebuiltins.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkstylepropertiesprivate.h"
typedef struct {
GtkCssSection *section;
const GValue *value;
} GtkCssLookupValue;
struct _GtkCssLookup {
GtkBitmask *missing;
GtkCssLookupValue values[1];
};
GtkCssLookup *
_gtk_css_lookup_new (void)
{
GtkCssLookup *lookup;
guint n = _gtk_css_style_property_get_n_properties ();
lookup = g_malloc0 (sizeof (GtkCssLookup) + sizeof (GtkCssLookupValue) * n);
lookup->missing = _gtk_bitmask_new ();
_gtk_bitmask_invert_range (lookup->missing, 0, n);
return lookup;
}
void
_gtk_css_lookup_free (GtkCssLookup *lookup)
{
g_return_if_fail (lookup != NULL);
_gtk_bitmask_free (lookup->missing);
g_free (lookup);
}
const GtkBitmask *
_gtk_css_lookup_get_missing (const GtkCssLookup *lookup)
{
g_return_val_if_fail (lookup != NULL, NULL);
return lookup->missing;
}
gboolean
_gtk_css_lookup_is_missing (const GtkCssLookup *lookup,
guint id)
{
g_return_val_if_fail (lookup != NULL, FALSE);
return lookup->values[id].value == NULL;
}
/**
* _gtk_css_lookup_set:
* @lookup: the lookup
* @id: id of the property to set, see _gtk_style_property_get_id()
* @section: (allow-none): The @section the value was defined in or %NULL
* @value: the "cascading value" to use
*
* Sets the @value for a given @id. No value may have been set for @id
* before. See _gtk_css_lookup_is_missing(). This function is used to
* set the "winning declaration" of a lookup. Note that for performance
* reasons @value and @section are not copied. It is your responsibility
* to ensure they are kept alive until _gtk_css_lookup_free() is called.
**/
void
_gtk_css_lookup_set (GtkCssLookup *lookup,
guint id,
GtkCssSection *section,
const GValue *value)
{
g_return_if_fail (lookup != NULL);
g_return_if_fail (_gtk_bitmask_get (lookup->missing, id));
g_return_if_fail (value != NULL);
_gtk_bitmask_set (lookup->missing, id, FALSE);
lookup->values[id].value = value;
lookup->values[id].section = section;
}
/**
* _gtk_css_lookup_resolve:
* @lookup: the lookup
* @context: the context the values are resolved for
*
* Resolves the current lookup into a styleproperties object. This is done
* by converting from the "winning declaration" to the "computed value".
*
* XXX: This bypasses the notion of "specified value". If this ever becomes
* an issue, go fix it.
*
* Returns: a new #GtkStyleProperties
**/
GtkStyleProperties *
_gtk_css_lookup_resolve (GtkCssLookup *lookup,
GtkStyleContext *context)
{
GtkStyleProperties *props;
GtkStyleContext *parent;
guint i, n;
g_return_val_if_fail (lookup != NULL, NULL);
g_return_val_if_fail (GTK_IS_STYLE_CONTEXT (context), NULL);
parent = gtk_style_context_get_parent (context);
n = _gtk_css_style_property_get_n_properties ();
props = gtk_style_properties_new ();
for (i = 0; i < n; i++)
{
GtkCssStyleProperty *prop = _gtk_css_style_property_lookup_by_id (i);
const GValue *result;
GValue value = { 0, };
/* http://www.w3.org/TR/css3-cascade/#cascade
* Then, for every element, the value for each property can be found
* by following this pseudo-algorithm:
* 1) Identify all declarations that apply to the element
*/
if (lookup->values[i].value != NULL)
{
/* 2) If the cascading process (described below) yields a winning
* declaration and the value of the winning declaration is not
* ‘initial’ or ‘inherit’, the value of the winning declaration
* becomes the specified value.
*/
if (!G_VALUE_HOLDS (lookup->values[i].value, GTK_TYPE_CSS_SPECIAL_VALUE))
{
result = lookup->values[i].value;
}
else
{
switch (g_value_get_enum (lookup->values[i].value))
{
case GTK_CSS_INHERIT:
/* 3) if the value of the winning declaration is ‘inherit’,
* the inherited value (see below) becomes the specified value.
*/
result = NULL;
break;
case GTK_CSS_INITIAL:
/* if the value of the winning declaration is ‘initial’,
* the initial value (see below) becomes the specified value.
*/
result = _gtk_css_style_property_get_initial_value (prop);
break;
default:
/* This is part of (2) above */
result = lookup->values[i].value;
break;
}
}
}
else
{
if (_gtk_css_style_property_is_inherit (prop))
{
/* 4) if the property is inherited, the inherited value becomes
* the specified value.
*/
result = NULL;
}
else
{
/* 5) Otherwise, the initial value becomes the specified value.
*/
result = _gtk_css_style_property_get_initial_value (prop);
}
}
if (result == NULL && parent == NULL)
{
/* If the ‘inherit’ value is set on the root element, the property is
* assigned its initial value. */
result = _gtk_css_style_property_get_initial_value (prop);
}
if (result)
{
_gtk_css_style_property_compute_value (prop, &value, context, result);
}
else
{
/* Set NULL here and do the inheritance upon lookup? */
gtk_style_context_get_property (parent,
_gtk_style_property_get_name (GTK_STYLE_PROPERTY (prop)),
gtk_style_context_get_state (parent),
&value);
}
_gtk_style_properties_set_property_by_property (props,
prop,
0,
&value);
g_value_unset (&value);
}
return props;
}
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