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[StThemeNode] Add a comparison function

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Add st_theme_node_equal() - two nodes are considered equal iff they
refer to identical elements, so e.g. .example and .example:hover are
not equal, even if no .example:hover rule exists in the CSS.

https://bugzilla.gnome.org/show_bug.cgi?id=619025
This commit is contained in:
Florian Müllner 2010-05-25 20:07:53 +02:00
parent e1a109b9be
commit 24a4ca0c6d
2 changed files with 45 additions and 0 deletions
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43
src/st/st-theme-node.c
View File

@ -233,6 +233,49 @@ st_theme_node_get_pseudo_class (StThemeNode *node)
return node->pseudo_class;
}
/**
* st_theme_node_equal:
* @node_a: first #StThemeNode
* @node_b: second #StThemeNode
*
* Compare two #StThemeNodes. Two nodes which compare equal will match
* the same CSS rules and have the same style properties. However, two
* nodes that have ended up with identical style properties do not
* necessarily compare equal.
* In detail, @node_a and @node_b are considered equal iff
* <itemizedlist>
* <listitem>
* <para>they share the same #StTheme and #StThemeContext</para>
* </listitem>
* <listitem>
* <para>they have the same parent</para>
* </listitem>
* <listitem>
* <para>they have the same element type</para>
* </listitem>
* <listitem>
* <para>their id, class, pseudo-class and inline-style match</para>
* </listitem>
* </itemizedlist>
*
* Returns: %TRUE if @node_a equals @node_b
*/
gboolean
st_theme_node_equal (StThemeNode *node_a, StThemeNode *node_b)
{
g_return_val_if_fail (ST_IS_THEME_NODE (node_a), FALSE);
g_return_val_if_fail (ST_IS_THEME_NODE (node_b), FALSE);
return node_a->parent_node == node_b->parent_node &&
node_a->context == node_b->context &&
node_a->theme == node_b->theme &&
node_a->element_type == node_b->element_type &&
!g_strcmp0 (node_a->element_id, node_b->element_id) &&
!g_strcmp0 (node_a->element_class, node_b->element_class) &&
!g_strcmp0 (node_a->pseudo_class, node_b->pseudo_class) &&
!g_strcmp0 (node_a->inline_style, node_b->inline_style);
}
static void
ensure_properties (StThemeNode *node)
{

2
src/st/st-theme-node.h
View File

@ -80,6 +80,8 @@ StThemeNode *st_theme_node_get_parent (StThemeNode *node);
StTheme *st_theme_node_get_theme (StThemeNode *node);
gboolean st_theme_node_equal (StThemeNode *node_a, StThemeNode *node_b);
GType st_theme_node_get_element_type (StThemeNode *node);
const char *st_theme_node_get_element_id (StThemeNode *node);
const char *st_theme_node_get_element_class (StThemeNode *node);