### Struct

# PangoGlyphItemIter

since: 1.22

#### Description [src]

    struct PangoGlyphItemIter {
      PangoGlyphItem* glyph_item;
      const gchar* text;
      int start_glyph;
      int start_index;
      int start_char;
      int end_glyph;
      int end_index;
      int end_char;
    }

A `PangoGlyphItemIter` is an iterator over the clusters in a `PangoGlyphItem`.

The forward direction of the iterator is the logical direction of text. That is, with increasing `start_index` and `start_char` values. If `glyph_item` is right-to-left (that is, if `glyph_item->item->analysis.level` is odd), then `start_glyph` decreases as the iterator moves forward. Moreover, in right-to-left cases, `start_glyph` is greater than `end_glyph`.

An iterator should be initialized using either `pango_glyph_item_iter_init_start()` or pango_glyph_item_iter_init_end(), for forward and backward iteration respectively, and walked over using any desired mixture of `pango_glyph_item_iter_next_cluster()` and pango_glyph_item_iter_prev_cluster().

A common idiom for doing a forward iteration over the clusters is:

    PangoGlyphItemIter cluster_iter;
    gboolean have_cluster;

    for (have_cluster = pango_glyph_item_iter_init_start (&cluster_iter,
                                                          glyph_item, text);
         have_cluster;
         have_cluster = pango_glyph_item_iter_next_cluster (&cluster_iter))
    {
      ...
    }

Note that `text` is the start of the text for layout, which is then indexed by `glyph_item->item->offset` to get to the text of `glyph_item`. The `start_index` and `end_index` values can directly index into `text`. The `start_glyph`, `end_glyph`, `start_char`, and `end_char` values however are zero-based for the `glyph_item`. For each cluster, the item pointed at by the start variables is included in the cluster while the one pointed at by end variables is not.

None of the members of a `PangoGlyphItemIter` should be modified manually.

###### Structure members

`glyph_item`
  No description available.
`text`
  No description available.
`start_glyph`
  No description available.
`start_index`
  No description available.
`start_char`
  No description available.
`end_glyph`
  No description available.
`end_index`
  No description available.
`end_char`
  No description available.

Available since: 1.22

#### Instance methods

###### pango_glyph_item_iter_copy

Make a shallow copy of an existing `PangoGlyphItemIter` structure.

since: 1.22

###### pango_glyph_item_iter_free

Frees a `PangoGlyphItem`Iter.

since: 1.22

###### pango_glyph_item_iter_init_end

Initializes a `PangoGlyphItemIter` structure to point to the last cluster in a glyph item.

since: 1.22

###### pango_glyph_item_iter_init_start

Initializes a `PangoGlyphItemIter` structure to point to the first cluster in a glyph item.

since: 1.22

###### pango_glyph_item_iter_next_cluster

Advances the iterator to the next cluster in the glyph item.

since: 1.22

###### pango_glyph_item_iter_prev_cluster

Moves the iterator to the preceding cluster in the glyph item. See `PangoGlyphItemIter` for details of cluster orders.

since: 1.22