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css: Make CSS resolving work according to spec

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See inline code comments taken from
  http://dev.w3.org/csswg/css3-cascade/#cascade

This now respects the special values "inherit" and "initial" properly.
Note that those values cannot be parsed yet. This will be added in a
future commit.
This commit is contained in:
Benjamin Otte 2011-12-29 14:04:33 +01:00
parent 5a815e2159
commit fbedcdaf7d
1 changed files with 90 additions and 6 deletions
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96
gtk/gtkcsslookup.c
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@ -21,6 +21,8 @@
#include "gtkcsslookupprivate.h"
#include "gtkcsstypesprivate.h"
#include "gtkprivatetypebuiltins.h"
#include "gtkstylepropertyprivate.h"
#include "gtkstylepropertiesprivate.h"
@ -120,13 +122,95 @@ _gtk_css_lookup_resolve (GtkCssLookup *lookup,
for (i = 0; i < n; i++)
{
if (lookup->values[i] == NULL)
continue;
const GtkStyleProperty *prop = _gtk_style_property_get (i);
const GValue *result;
_gtk_style_properties_set_property_by_property (props,
_gtk_style_property_get (i),
0,
lookup->values[i]);
/* 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] != 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], GTK_TYPE_CSS_SPECIAL_VALUE))
{
result = lookup->values[i];
}
else
{
switch (g_value_get_enum (lookup->values[i]))
{
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_style_property_get_initial_value (prop);
break;
default:
/* This is part of (2) above */
result = lookup->values[i];
break;
}
}
}
else
{
if (_gtk_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_style_property_get_initial_value (prop);
}
}
if (result)
{
_gtk_style_properties_set_property_by_property (props,
prop,
0,
result);
}
else if (parent == NULL)
{
/* If the ‘inherit’ value is set on the root element, the property is
* assigned its initial value. */
_gtk_style_properties_set_property_by_property (props,
prop,
0,
_gtk_style_property_get_initial_value (prop));
}
else
{
GValue value = { 0, };
/* Set NULL here and do the inheritance upon lookup? */
gtk_style_context_get_property (parent,
prop->pspec->name,
gtk_style_context_get_state (parent),
&value);
_gtk_style_properties_set_property_by_property (props,
prop,
0,
&value);
g_value_unset (&value);
}
}
return props;