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styleproperty: Add a function to compare values for equality

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and default to never compare them as equal.
This commit is contained in:
Benjamin Otte 2012-03-23 23:52:48 +01:00
parent 5bbf59b519
commit 115c34498e
2 changed files with 38 additions and 0 deletions
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31
gtk/gtkcssstyleproperty.c
View File

@ -298,12 +298,21 @@ gtk_css_style_property_real_compute_value (GtkCssStyleProperty *property,
return _gtk_css_style_compute_value (context, _gtk_css_style_property_get_computed_type (property), specified);
}
static gboolean
gtk_css_style_property_real_equal (GtkCssStyleProperty *property,
GtkCssValue *value1,
GtkCssValue *value2)
{
return FALSE;
}
static void
_gtk_css_style_property_init (GtkCssStyleProperty *property)
{
property->parse_value = gtk_css_style_property_real_parse_value;
property->print_value = gtk_css_style_property_real_print_value;
property->compute_value = gtk_css_style_property_real_compute_value;
property->equal_func = gtk_css_style_property_real_equal;
}
/**
@ -538,3 +547,25 @@ _gtk_css_style_property_print_value (GtkCssStyleProperty *property,
}
}
/**
* _gtk_css_style_property_is_equal:
* @property: the property
* @value1: the first value to compare
* @value2: the second value to compare
*
* Compares @value1 and @value2 for equality. Both values must be the
* result of a call _gtk_css_style_property_compute_value().
*
* Returns: %TRUE if @value1 and @value2 are equal
**/
gboolean
_gtk_css_style_property_is_equal (GtkCssStyleProperty *property,
GtkCssValue *value1,
GtkCssValue *value2)
{
g_return_val_if_fail (GTK_IS_CSS_STYLE_PROPERTY (property), FALSE);
g_return_val_if_fail (value1 != NULL, FALSE);
g_return_val_if_fail (value2 != NULL, FALSE);
return property->equal_func (property, value1, value2);
}

7
gtk/gtkcssstylepropertyprivate.h
View File

@ -44,6 +44,9 @@ typedef void (* GtkCssStylePropertyPrintFunc) (GtkCssStyleProperty
typedef GtkCssValue * (* GtkCssStylePropertyComputeFunc)(GtkCssStyleProperty *property,
GtkStyleContext *context,
GtkCssValue *specified);
typedef gboolean (* GtkCssStylePropertyEqualFunc) (GtkCssStyleProperty *property,
GtkCssValue *value1,
GtkCssValue *value2);
struct _GtkCssStyleProperty
{
GtkStyleProperty parent;
@ -56,6 +59,7 @@ struct _GtkCssStyleProperty
GtkCssStylePropertyParseFunc parse_value;
GtkCssStylePropertyPrintFunc print_value;
GtkCssStylePropertyComputeFunc compute_value;
GtkCssStylePropertyEqualFunc equal_func;
};
struct _GtkCssStylePropertyClass
@ -88,6 +92,9 @@ GtkCssValue * _gtk_css_style_property_compute_value (GtkCssStyleProp
void _gtk_css_style_property_print_value (GtkCssStyleProperty *property,
GtkCssValue *value,
GString *string);
gboolean _gtk_css_style_property_is_equal (GtkCssStyleProperty *property,
GtkCssValue *value1,
GtkCssValue *value2);
G_END_DECLS