GtkWidgetPath

## GtkWidgetPath GtkWidgetPath — Widget path abstraction |

## Synopsis

    #include <gtk/gtk.h>

                        GtkWidgetPath;
    gint                gtk_widget_path_append_type         (GtkWidgetPath *path,
                                                             GType type);
    gint                gtk_widget_path_append_with_siblings
                                                            (GtkWidgetPath *path,
                                                             GtkWidgetPath *siblings,
                                                             guint sibling_index);
    gint                gtk_widget_path_append_for_widget   (GtkWidgetPath *path,
                                                             GtkWidget *widget);
    GtkWidgetPath *     gtk_widget_path_copy                (const GtkWidgetPath *path);
    GtkWidgetPath *     gtk_widget_path_ref                 (GtkWidgetPath *path);
    void                gtk_widget_path_unref               (GtkWidgetPath *path);
    void                gtk_widget_path_free                (GtkWidgetPath *path);
    GType               gtk_widget_path_get_object_type     (const GtkWidgetPath *path);
    gboolean            gtk_widget_path_has_parent          (const GtkWidgetPath *path,
                                                             GType type);
    gboolean            gtk_widget_path_is_type             (const GtkWidgetPath *path,
                                                             GType type);
    void                gtk_widget_path_iter_add_class      (GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name);
    void                gtk_widget_path_iter_add_region     (GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name,
                                                             GtkRegionFlags flags);
    void                gtk_widget_path_iter_clear_classes  (GtkWidgetPath *path,
                                                             gint pos);
    void                gtk_widget_path_iter_clear_regions  (GtkWidgetPath *path,
                                                             gint pos);
    const gchar *       gtk_widget_path_iter_get_name       (const GtkWidgetPath *path,
                                                             gint pos);
    GType               gtk_widget_path_iter_get_object_type
                                                            (const GtkWidgetPath *path,
                                                             gint pos);
    const GtkWidgetPath * gtk_widget_path_iter_get_siblings (const GtkWidgetPath *path,
                                                             gint pos);
    guint               gtk_widget_path_iter_get_sibling_index
                                                            (const GtkWidgetPath *path,
                                                             gint pos);
    gboolean            gtk_widget_path_iter_has_class      (const GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name);
    gboolean            gtk_widget_path_iter_has_name       (const GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name);
    gboolean            gtk_widget_path_iter_has_qclass     (const GtkWidgetPath *path,
                                                             gint pos,
                                                             GQuark qname);
    gboolean            gtk_widget_path_iter_has_qname      (const GtkWidgetPath *path,
                                                             gint pos,
                                                             GQuark qname);
    gboolean            gtk_widget_path_iter_has_qregion    (const GtkWidgetPath *path,
                                                             gint pos,
                                                             GQuark qname,
                                                             GtkRegionFlags *flags);
    gboolean            gtk_widget_path_iter_has_region     (const GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name,
                                                             GtkRegionFlags *flags);
    GSList *            gtk_widget_path_iter_list_classes   (const GtkWidgetPath *path,
                                                             gint pos);
    GSList *            gtk_widget_path_iter_list_regions   (const GtkWidgetPath *path,
                                                             gint pos);
    void                gtk_widget_path_iter_remove_class   (GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name);
    void                gtk_widget_path_iter_remove_region  (GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name);
    void                gtk_widget_path_iter_set_name       (GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name);
    void                gtk_widget_path_iter_set_object_type
                                                            (GtkWidgetPath *path,
                                                             gint pos,
                                                             GType type);
    gint                gtk_widget_path_length              (const GtkWidgetPath *path);
    GtkWidgetPath *     gtk_widget_path_new                 (void);
    void                gtk_widget_path_prepend_type        (GtkWidgetPath *path,
                                                             GType type);
    char *              gtk_widget_path_to_string           (const GtkWidgetPath *path);

## Description

GtkWidgetPath is a boxed type that represents a widget hierarchy from the topmost widget, typically a toplevel, to any child. This widget path abstraction is used in GtkStyleContext on behalf of the real widget in order to query style information.

If you are using GTK+ widgets, you probably will not need to use this API directly, as there is `gtk_widget_get_path()`, and the style context returned by `gtk_widget_get_style_context()` will be automatically updated on widget hierarchy changes.

The widget path generation is generally simple:

Example 40. Defining a button within a window

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    {
      GtkWidgetPath *path;

      path = gtk_widget_path_new ();
      gtk_widget_path_append_type (path, GTK_TYPE_WINDOW);
      gtk_widget_path_append_type (path, GTK_TYPE_BUTTON);
    }

Although more complex information, such as widget names, or different classes (property that may be used by other widget types) and intermediate regions may be included:

Example 41. Defining the first tab widget in a notebook

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    {
      GtkWidgetPath *path;
      guint pos;

      path = gtk_widget_path_new ();

      pos = gtk_widget_path_append_type (path, GTK_TYPE_NOTEBOOK);
      gtk_widget_path_iter_add_region (path, pos, "tab", GTK_REGION_EVEN | GTK_REGION_FIRST);

      pos = gtk_widget_path_append_type (path, GTK_TYPE_LABEL);
      gtk_widget_path_iter_set_name (path, pos, "first tab label");
    }

All this information will be used to match the style information that applies to the described widget.

## Details

### GtkWidgetPath

    typedef struct _GtkWidgetPath GtkWidgetPath;

### gtk_widget_path_append_type ()

    gint                gtk_widget_path_append_type         (GtkWidgetPath *path,
                                                             GType type);

Appends a widget type to the widget hierarchy represented by `path`.

`path` : | a GtkWidgetPath
`type` : | widget type to append
Returns : | the position where the element was inserted

Since 3.0

### gtk_widget_path_append_with_siblings ()

    gint                gtk_widget_path_append_with_siblings
                                                            (GtkWidgetPath *path,
                                                             GtkWidgetPath *siblings,
                                                             guint sibling_index);

Appends a widget type with all its siblings to the widget hierarchy represented by `path`. Using this function instead of `gtk_widget_path_append_type()` will allow the CSS theming to use sibling matches in selectors and apply :nth-`child()` pseudo classes. In turn, it requires a lot more care in widget implementations as widgets need to make sure to call `gtk_widget_reset_style()` on all involved widgets when the `siblings` path changes.

`path` : | the widget path to append to
`siblings` : | a widget path describing a list of siblings. This path may not contain any siblings itself and it must not be modified afterwards.
`sibling_index` : | index into `siblings` for where the added element is positioned.
Returns : | the position where the element was inserted.

Since 3.2

### gtk_widget_path_append_for_widget ()

    gint                gtk_widget_path_append_for_widget   (GtkWidgetPath *path,
                                                             GtkWidget *widget);

Appends the data from `widget` to the widget hierarchy represented by `path`. This function is a shortcut for adding information from `widget` to the given `path`. This includes setting the name or adding the style classes from `widget`.

`path` : | a widget path
`widget` : | the widget to append to the widget path
Returns : | the position where the data was inserted

Since 3.2

### gtk_widget_path_copy ()

    GtkWidgetPath *     gtk_widget_path_copy                (const GtkWidgetPath *path);

Returns a copy of `path`

`path` : | a GtkWidgetPath
Returns : | a copy of `path`. [transfer full]

Since 3.0

### gtk_widget_path_ref ()

    GtkWidgetPath *     gtk_widget_path_ref                 (GtkWidgetPath *path);

Increments the reference count on `path`.

`path` : | a GtkWidgetPath
Returns : | `path` itself.

Since 3.2

### gtk_widget_path_unref ()

    void                gtk_widget_path_unref               (GtkWidgetPath *path);

Decrements the reference count on `path`, freeing the structure if the reference count reaches 0.

`path` : | a GtkWidgetPath

Since 3.2

### gtk_widget_path_free ()

    void                gtk_widget_path_free                (GtkWidgetPath *path);

Decrements the reference count on `path`, freeing the structure if the reference count reaches 0.

`path` : | a GtkWidgetPath

Since 3.0

### gtk_widget_path_get_object_type ()

    GType               gtk_widget_path_get_object_type     (const GtkWidgetPath *path);

Returns the topmost object type, that is, the object type this path is representing.

`path` : | a GtkWidget
Returns : | The object type

Since 3.0

### gtk_widget_path_has_parent ()

    gboolean            gtk_widget_path_has_parent          (const GtkWidgetPath *path,
                                                             GType type);

Returns `TRUE` if any of the parents of the widget represented in `path` is of type `type`, or any subtype of it.

`path` : | a GtkWidgetPath
`type` : | widget type to check in parents
Returns : | `TRUE` if any parent is of type `type`

Since 3.0

### gtk_widget_path_is_type ()

    gboolean            gtk_widget_path_is_type             (const GtkWidgetPath *path,
                                                             GType type);

Returns `TRUE` if the widget type represented by this path is `type`, or a subtype of it.

`path` : | a GtkWidgetPath
`type` : | widget type to match
Returns : | `TRUE` if the widget represented by `path` is of type `type`

Since 3.0

### gtk_widget_path_iter_add_class ()

    void                gtk_widget_path_iter_add_class      (GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name);

Adds the class `name` to the widget at position `pos` in the hierarchy defined in `path`. See `gtk_style_context_add_class()`.

`path` : | a GtkWidget
`pos` : | position to modify, -1 for the path head
`name` : | a class name

Since 3.0

### gtk_widget_path_iter_add_region ()

    void                gtk_widget_path_iter_add_region     (GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name,
                                                             GtkRegionFlags flags);

Adds the region `name` to the widget at position `pos` in the hierarchy defined in `path`. See `gtk_style_context_add_region()`.

### Note

Region names must only contain lowercase letters and '-', starting always with a lowercase letter.

`path` : | a GtkWidgetPath
`pos` : | position to modify, -1 for the path head
`name` : | region name
`flags` : | flags affecting the region

Since 3.0

### gtk_widget_path_iter_clear_classes ()

    void                gtk_widget_path_iter_clear_classes  (GtkWidgetPath *path,
                                                             gint pos);

Removes all classes from the widget at position `pos` in the hierarchy defined in `path`.

`path` : | a GtkWidget
`pos` : | position to modify, -1 for the path head

Since 3.0

### gtk_widget_path_iter_clear_regions ()

    void                gtk_widget_path_iter_clear_regions  (GtkWidgetPath *path,
                                                             gint pos);

Removes all regions from the widget at position `pos` in the hierarchy defined in `path`.

`path` : | a GtkWidgetPath
`pos` : | position to modify, -1 for the path head

Since 3.0

### gtk_widget_path_iter_get_name ()

    const gchar *       gtk_widget_path_iter_get_name       (const GtkWidgetPath *path,
                                                             gint pos);

Returns the name corresponding to the widget found at the position `pos` in the widget hierarchy defined by `path`

`path` : | a GtkWidgetPath
`pos` : | position to get the widget name for, -1 for the path head
Returns : | The widget name, or `NULL` if none was set.

### gtk_widget_path_iter_get_object_type ()

    GType               gtk_widget_path_iter_get_object_type
                                                            (const GtkWidgetPath *path,
                                                             gint pos);

Returns the object GType that is at position `pos` in the widget hierarchy defined in `path`.

`path` : | a GtkWidgetPath
`pos` : | position to get the object type for, -1 for the path head
Returns : | a widget type

Since 3.0

### gtk_widget_path_iter_get_siblings ()

    const GtkWidgetPath * gtk_widget_path_iter_get_siblings (const GtkWidgetPath *path,
                                                             gint pos);

Returns the list of siblings for the element at `pos`. If the element was not added with siblings, `NULL` is returned.

`path` : | a GtkWidgetPath
`pos` : | position to get the siblings for, -1 for the path head
Returns : | `NULL` or the list of siblings for the element at `pos`.

### gtk_widget_path_iter_get_sibling_index ()

    guint               gtk_widget_path_iter_get_sibling_index
                                                            (const GtkWidgetPath *path,
                                                             gint pos);

Returns the index into the list of siblings for the element at `pos` as returned by `gtk_widget_path_iter_get_siblings()`. If that function would return `NULL` because the element at `pos` has no siblings, this function will return 0.

`path` : | a GtkWidgetPath
`pos` : | position to get the sibling index for, -1 for the path head
Returns : | 0 or the index into the list of siblings for the element at `pos`.

### gtk_widget_path_iter_has_class ()

    gboolean            gtk_widget_path_iter_has_class      (const GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name);

Returns `TRUE` if the widget at position `pos` has the class `name` defined, `FALSE` otherwise.

`path` : | a GtkWidgetPath
`pos` : | position to query, -1 for the path head
`name` : | class name
Returns : | `TRUE` if the class `name` is defined for the widget at `pos`

Since 3.0

### gtk_widget_path_iter_has_name ()

    gboolean            gtk_widget_path_iter_has_name       (const GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name);

Returns `TRUE` if the widget at position `pos` has the name `name`, `FALSE` otherwise.

`path` : | a GtkWidgetPath
`pos` : | position to query, -1 for the path head
`name` : | a widget name
Returns : | `TRUE` if the widget at `pos` has this name

Since 3.0

### gtk_widget_path_iter_has_qclass ()

    gboolean            gtk_widget_path_iter_has_qclass     (const GtkWidgetPath *path,
                                                             gint pos,
                                                             GQuark qname);

See `gtk_widget_path_iter_has_class()`. This is a version that operates with GQuarks.

`path` : | a GtkWidgetPath
`pos` : | position to query, -1 for the path head
`qname` : | class name as a GQuark
Returns : | `TRUE` if the widget at `pos` has the class defined.

Since 3.0

### gtk_widget_path_iter_has_qname ()

    gboolean            gtk_widget_path_iter_has_qname      (const GtkWidgetPath *path,
                                                             gint pos,
                                                             GQuark qname);

See `gtk_widget_path_iter_has_name()`. This is a version that operates on GQuarks.

`path` : | a GtkWidgetPath
`pos` : | position to query, -1 for the path head
`qname` : | widget name as a GQuark
Returns : | `TRUE` if the widget at `pos` has this name

Since 3.0

### gtk_widget_path_iter_has_qregion ()

    gboolean            gtk_widget_path_iter_has_qregion    (const GtkWidgetPath *path,
                                                             gint pos,
                                                             GQuark qname,
                                                             GtkRegionFlags *flags);

See `gtk_widget_path_iter_has_region()`. This is a version that operates with GQuarks.

`path` : | a GtkWidgetPath
`pos` : | position to query, -1 for the path head
`qname` : | region name as a GQuark
`flags` : | return location for the region flags. [out]
Returns : | `TRUE` if the widget at `pos` has the region defined.

Since 3.0

### gtk_widget_path_iter_has_region ()

    gboolean            gtk_widget_path_iter_has_region     (const GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name,
                                                             GtkRegionFlags *flags);

Returns `TRUE` if the widget at position `pos` has the class `name` defined, `FALSE` otherwise.

`path` : | a GtkWidgetPath
`pos` : | position to query, -1 for the path head
`name` : | region name
`flags` : | return location for the region flags. [out]
Returns : | `TRUE` if the class `name` is defined for the widget at `pos`

Since 3.0

### gtk_widget_path_iter_list_classes ()

    GSList *            gtk_widget_path_iter_list_classes   (const GtkWidgetPath *path,
                                                             gint pos);

Returns a list with all the class names defined for the widget at position `pos` in the hierarchy defined in `path`.

`path` : | a GtkWidgetPath
`pos` : | position to query, -1 for the path head
Returns : | The list of classes, This is a list of strings, the GSList contents are owned by GTK+, but you should use `g_slist_free()` to free the list itself. [transfer container][element-type utf8]

Since 3.0

### gtk_widget_path_iter_list_regions ()

    GSList *            gtk_widget_path_iter_list_regions   (const GtkWidgetPath *path,
                                                             gint pos);

Returns a list with all the region names defined for the widget at position `pos` in the hierarchy defined in `path`.

`path` : | a GtkWidgetPath
`pos` : | position to query, -1 for the path head
Returns : | The list of regions, This is a list of strings, the GSList contents are owned by GTK+, but you should use `g_slist_free()` to free the list itself. [transfer container][element-type utf8]

Since 3.0

### gtk_widget_path_iter_remove_class ()

    void                gtk_widget_path_iter_remove_class   (GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name);

Removes the class `name` from the widget at position `pos` in the hierarchy defined in `path`.

`path` : | a GtkWidgetPath
`pos` : | position to modify, -1 for the path head
`name` : | class name

Since 3.0

### gtk_widget_path_iter_remove_region ()

    void                gtk_widget_path_iter_remove_region  (GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name);

Removes the region `name` from the widget at position `pos` in the hierarchy defined in `path`.

`path` : | a GtkWidgetPath
`pos` : | position to modify, -1 for the path head
`name` : | region name

Since 3.0

### gtk_widget_path_iter_set_name ()

    void                gtk_widget_path_iter_set_name       (GtkWidgetPath *path,
                                                             gint pos,
                                                             const gchar *name);

Sets the widget name for the widget found at position `pos` in the widget hierarchy defined by `path`.

`path` : | a GtkWidgetPath
`pos` : | position to modify, -1 for the path head
`name` : | widget name

Since 3.0

### gtk_widget_path_iter_set_object_type ()

    void                gtk_widget_path_iter_set_object_type
                                                            (GtkWidgetPath *path,
                                                             gint pos,
                                                             GType type);

Sets the object type for a given position in the widget hierarchy defined by `path`.

`path` : | a GtkWidgetPath
`pos` : | position to modify, -1 for the path head
`type` : | object type to set

Since 3.0

### gtk_widget_path_length ()

    gint                gtk_widget_path_length              (const GtkWidgetPath *path);

Returns the number of GtkWidget GTypes between the represented widget and its topmost container.

`path` : | a GtkWidgetPath
Returns : | the number of elements in the path

Since 3.0

### gtk_widget_path_new ()

    GtkWidgetPath *     gtk_widget_path_new                 (void);

Returns an empty widget path.

Returns : | A newly created, empty, GtkWidgetPath. [transfer full]

Since 3.0

### gtk_widget_path_prepend_type ()

    void                gtk_widget_path_prepend_type        (GtkWidgetPath *path,
                                                             GType type);

Prepends a widget type to the widget hierachy represented by `path`.

`path` : | a GtkWidgetPath
`type` : | widget type to prepend

Since 3.0

### gtk_widget_path_to_string ()

    char *              gtk_widget_path_to_string           (const GtkWidgetPath *path);

Dumps the widget path into a string representation. It tries to match the CSS style as closely as possible (Note that there might be paths that cannot be represented in CSS).

The main use of this code is for debugging purposes, so that you can `g_print()` the path or dump it in a gdb session.

`path` : | the path
Returns : | A new string describing `path`.

Since 3.2

## See Also

GtkStyleContext