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css: Move computing of initial and inherit values

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... to the compute vfunc. Simplifies code quite a bit. But makes the
code no longer a simple step-by-step implementation of the spec.
This commit is contained in:
Benjamin Otte 2012-07-17 14:01:52 +02:00
parent 6dc3113edc
commit 9e7e65ca6e
5 changed files with 24 additions and 81 deletions
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65
gtk/gtkcsscomputedvalues.c
View File

@ -90,15 +90,10 @@ _gtk_css_computed_values_compute_value (GtkCssComputedValues *values,
GtkCssValue *specified,
GtkCssSection *section)
{
GtkCssStyleProperty *prop;
GtkStyleContext *parent;
g_return_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values));
g_return_if_fail (GTK_IS_STYLE_CONTEXT (context));
prop = _gtk_css_style_property_lookup_by_id (id);
parent = gtk_style_context_get_parent (context);
gtk_css_computed_values_ensure_array (values, id + 1);
/* http://www.w3.org/TR/css3-cascade/#cascade
@ -106,65 +101,19 @@ _gtk_css_computed_values_compute_value (GtkCssComputedValues *values,
* by following this pseudo-algorithm:
* 1) Identify all declarations that apply to the element
*/
if (specified != NULL)
if (specified == NULL)
{
if (_gtk_css_value_is_inherit (specified))
{
/* 3) if the value of the winning declaration is ‘inherit’,
* the inherited value (see below) becomes the specified value.
*/
specified = NULL;
}
else if (_gtk_css_value_is_initial (specified))
{
/* if the value of the winning declaration is ‘initial’,
* the initial value (see below) becomes the specified value.
*/
specified = _gtk_css_style_property_get_initial_value (prop);
}
GtkCssStyleProperty *prop = _gtk_css_style_property_lookup_by_id (id);
/* 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.
*/
}
else
{
if (_gtk_css_style_property_is_inherit (prop))
{
/* 4) if the property is inherited, the inherited value becomes
* the specified value.
*/
specified = NULL;
}
specified = _gtk_css_inherit_value_new ();
else
{
/* 5) Otherwise, the initial value becomes the specified value.
*/
specified = _gtk_css_style_property_get_initial_value (prop);
}
}
if (specified == NULL && parent == NULL)
{
/* If the ‘inherit’ value is set on the root element, the property is
* assigned its initial value. */
specified = _gtk_css_style_property_get_initial_value (prop);
}
if (specified)
{
g_ptr_array_index (values->values, id) = _gtk_css_value_compute (specified, id, context);
specified = _gtk_css_initial_value_new ();
}
else
{
GtkCssValue *parent_value;
/* Set NULL here and do the inheritance upon lookup? */
parent_value = _gtk_style_context_peek_property (parent, id);
_gtk_css_value_ref (specified);
g_ptr_array_index (values->values, id) = _gtk_css_value_ref (parent_value);
}
g_ptr_array_index (values->values, id) = _gtk_css_value_compute (specified, id, context);
if (section)
{
@ -175,6 +124,8 @@ _gtk_css_computed_values_compute_value (GtkCssComputedValues *values,
g_ptr_array_index (values->sections, id) = gtk_css_section_ref (section);
}
_gtk_css_value_unref (specified);
}
void

21
gtk/gtkcssinheritvalue.c
View File

@ -19,6 +19,9 @@
#include "gtkcssinheritvalueprivate.h"
#include "gtkcssstylepropertyprivate.h"
#include "gtkstylecontextprivate.h"
struct _GtkCssValue {
GTK_CSS_VALUE_BASE
};
@ -35,8 +38,14 @@ gtk_css_value_inherit_compute (GtkCssValue *value,
guint property_id,
GtkStyleContext *context)
{
/* This value should be caught further up */
g_return_val_if_reached (_gtk_css_value_ref (value));
GtkStyleContext *parent = gtk_style_context_get_parent (context);
if (parent)
return _gtk_css_value_ref (_gtk_style_context_peek_property (parent, property_id));
else
return _gtk_css_value_compute (_gtk_css_style_property_get_initial_value (_gtk_css_style_property_lookup_by_id (property_id)),
property_id,
context);
}
static gboolean
@ -76,11 +85,3 @@ _gtk_css_inherit_value_new (void)
{
return _gtk_css_value_ref (&inherit);
}
gboolean
_gtk_css_value_is_inherit (const GtkCssValue *value)
{
g_return_val_if_fail (value != NULL, FALSE);
return value == &inherit;
}

2
gtk/gtkcssinheritvalueprivate.h
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@ -26,8 +26,6 @@ G_BEGIN_DECLS
GtkCssValue * _gtk_css_inherit_value_new (void);
gboolean _gtk_css_value_is_inherit (const GtkCssValue *value);
G_END_DECLS
#endif /* __GTK_CSS_INHERIT_VALUE_PRIVATE_H__ */

15
gtk/gtkcssinitialvalue.c
View File

@ -19,6 +19,8 @@
#include "gtkcssinitialvalueprivate.h"
#include "gtkcssstylepropertyprivate.h"
struct _GtkCssValue {
GTK_CSS_VALUE_BASE
};
@ -35,8 +37,9 @@ gtk_css_value_initial_compute (GtkCssValue *value,
guint property_id,
GtkStyleContext *context)
{
/* This value should be caught further up */
g_return_val_if_reached (_gtk_css_value_ref (value));
return _gtk_css_value_compute (_gtk_css_style_property_get_initial_value (_gtk_css_style_property_lookup_by_id (property_id)),
property_id,
context);
}
static gboolean
@ -76,11 +79,3 @@ _gtk_css_initial_value_new (void)
{
return _gtk_css_value_ref (&initial);
}
gboolean
_gtk_css_value_is_initial (const GtkCssValue *value)
{
g_return_val_if_fail (value != NULL, FALSE);
return value == &initial;
}

2
gtk/gtkcssinitialvalueprivate.h
View File

@ -26,8 +26,6 @@ G_BEGIN_DECLS
GtkCssValue * _gtk_css_initial_value_new (void);
gboolean _gtk_css_value_is_initial (const GtkCssValue *value);
G_END_DECLS
#endif /* __GTK_CSS_INITIAL_VALUE_PRIVATE_H__ */