diff options
| -rw-r--r-- | docs/pango-sections.txt | 1 | ||||
| -rw-r--r-- | pango/pango-attributes.c | 42 | ||||
| -rw-r--r-- | pango/pango-attributes.h | 5 |
3 files changed, 48 insertions, 0 deletions
diff --git a/docs/pango-sections.txt b/docs/pango-sections.txt index 9bf20619..60d360d6 100644 --- a/docs/pango-sections.txt +++ b/docs/pango-sections.txt @@ -410,6 +410,7 @@ pango_attr_list_insert_before pango_attr_list_change pango_attr_list_splice pango_attr_list_filter +pango_attr_list_apply_delta PangoAttrFilterFunc pango_attr_list_get_iterator PangoAttrIterator diff --git a/pango/pango-attributes.c b/pango/pango-attributes.c index 85e5a240..f641e9ac 100644 --- a/pango/pango-attributes.c +++ b/pango/pango-attributes.c @@ -1599,6 +1599,48 @@ pango_attr_list_change (PangoAttrList *list, } /** + * pango_attr_list_apply_delta: + * @list: a #PangoAttrList + * @pos: the position of the change + * @remove: the number of removed bytes + * @add: the number of added bytes + * + * Update indices of attributes in @list for + * a change in the text they refer to. + * + * The change that this function applies is + * removing @remove bytes at position @pos + * and inserting @add bytes instead. + * + * Attributes start and end positions are updated + * if they are behind @pos + @remove. Positions + * that fall into the (@pos, @pos + @remove) range + * are not updated, since we don't know how the + * removed and added text affects them. + */ +void +pango_attr_list_apply_delta (PangoAttrList *list, + int pos, + int remove, + int add) +{ + GSList *l; + + for (l = list->attributes; l; l = l->next) + { + PangoAttribute *attr = l->data; + + if (attr->end_index < pos) + continue; + + if (attr->start_index >= pos + remove) + attr->start_index += add - remove; + if (attr->end_index >= pos + remove) + attr->end_index += add - remove; + } +} + +/** * pango_attr_list_splice: * @list: a #PangoAttrList * @other: another #PangoAttrList diff --git a/pango/pango-attributes.h b/pango/pango-attributes.h index cff495b2..b933bc11 100644 --- a/pango/pango-attributes.h +++ b/pango/pango-attributes.h @@ -547,6 +547,11 @@ void pango_attr_list_splice (PangoAttrList *list, PangoAttrList *other, gint pos, gint len); +PANGO_AVAILABLE_IN_1_44 +void pango_attr_list_apply_delta (PangoAttrList *list, + int pos, + int remove, + int add); PANGO_AVAILABLE_IN_1_2 PangoAttrList *pango_attr_list_filter (PangoAttrList *list, |