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GtkCssProvider: Add support for child/descendant combinators.

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Now, selectors like:

  GtkWindow > GtkButton {}
  GtkNotebook > GtkLabel {}

will represent a direct parent/child relation between both elements, while

  GtkWindow GtkButton {}
  GtkNotebook GtkLabel {}

will allow intermediate children between these.
This commit is contained in:
Carlos Garnacho 2010-04-16 03:02:42 +02:00
parent d691e79cbf
commit 8c03503d16
1 changed files with 38 additions and 2 deletions
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40
gtk/gtkcssprovider.c
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@ -33,6 +33,7 @@ typedef struct SelectorElement SelectorElement;
typedef struct SelectorPath SelectorPath;
typedef struct SelectorStyleInfo SelectorStyleInfo;
typedef enum SelectorElementType SelectorElementType;
typedef enum CombinatorType CombinatorType;
typedef enum ParserScope ParserScope;
enum SelectorElementType {
@ -42,9 +43,15 @@ enum SelectorElementType {
SELECTOR_GLOB
};
enum CombinatorType {
COMBINATOR_DESCENDANT, /* No direct relation needed */
COMBINATOR_CHILD /* Direct child */
};
struct SelectorElement
{
SelectorElementType elem_type;
CombinatorType combinator;
union
{
@ -150,6 +157,7 @@ selector_path_prepend_type (SelectorPath *path,
GType type;
elem = g_slice_new (SelectorElement);
elem->combinator = COMBINATOR_DESCENDANT;
type = g_type_from_name (type_name);
if (type == G_TYPE_INVALID)
@ -173,10 +181,24 @@ selector_path_prepend_glob (SelectorPath *path)
elem = g_slice_new (SelectorElement);
elem->elem_type = SELECTOR_GLOB;
elem->combinator = COMBINATOR_DESCENDANT;
path->elements = g_slist_prepend (path->elements, elem);
}
static void
selector_path_prepend_combinator (SelectorPath *path,
CombinatorType combinator)
{
SelectorElement *elem;
g_assert (path->elements != NULL);
/* It is actually stored in the last element */
elem = path->elements->data;
elem->combinator = combinator;
}
static gint
selector_path_depth (SelectorPath *path)
{
@ -286,8 +308,16 @@ compare_path_foreach (GType type,
if (!g_type_is_a (type, elem->type))
{
/* Selector definitely doesn't match */
data->score = 0;
return TRUE;
if (elem->combinator == COMBINATOR_CHILD)
{
data->score = 0;
return TRUE;
}
else
{
/* Keep checking descendants for a match */
return FALSE;
}
}
else if (type == elem->type)
data->score |= 0xF;
@ -614,6 +644,12 @@ parse_selector (GtkCssProvider *css_provider,
}
g_scanner_get_next_token (scanner);
if (scanner->token == '>')
{
selector_path_prepend_combinator (path, COMBINATOR_CHILD);
g_scanner_get_next_token (scanner);
}
}
if (scanner->token == ':')