diff options
| -rw-r--r-- | docs/pango-sections.txt | 1 | ||||
| -rw-r--r-- | pango/pango-attributes.c | 81 | ||||
| -rw-r--r-- | pango/pango-attributes.h | 5 |
3 files changed, 87 insertions, 0 deletions
diff --git a/docs/pango-sections.txt b/docs/pango-sections.txt index 3b70e980..11aabcae 100644 --- a/docs/pango-sections.txt +++ b/docs/pango-sections.txt @@ -425,6 +425,7 @@ pango_attr_list_insert_before pango_attr_list_change pango_attr_list_splice pango_attr_list_filter +pango_attr_list_update PangoAttrFilterFunc pango_attr_list_get_attributes pango_attr_list_get_iterator diff --git a/pango/pango-attributes.c b/pango/pango-attributes.c index ac27251d..17549ffd 100644 --- a/pango/pango-attributes.c +++ b/pango/pango-attributes.c @@ -1599,6 +1599,87 @@ pango_attr_list_change (PangoAttrList *list, } /** + * pango_attr_list_update: + * @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 that fall entirely in the + * (@pos, @pos + @remove) range are removed. + * + * Attributes that start or end inside the + * (@pos, @pos + @remove) range are shortened to + * reflect the removal. + * + * Attributes start and end positions are updated + * if they are behind @pos + @remove. + * + * Since: 1.44 + */ +void +pango_attr_list_update (PangoAttrList *list, + int pos, + int remove, + int add) +{ + GSList *l, *prev, *next; + + prev = NULL; + l = list->attributes; + while (l) + { + next = l->next; + PangoAttribute *attr = l->data; + + if (attr->start_index >= pos && + attr->end_index < pos + remove) + { + pango_attribute_destroy (attr); + if (prev == NULL) + list->attributes = next; + else + prev->next = next; + + g_slist_free_1 (l); + } + else + { + prev = l; + + if (attr->start_index >= pos && + attr->start_index < pos + remove) + { + attr->start_index = pos + add; + } + else if (attr->start_index >= pos + remove) + { + attr->start_index += add - remove; + } + + if (attr->end_index >= pos && + attr->end_index < pos + remove) + { + attr->end_index = pos; + } + else if (attr->end_index >= pos + remove) + { + attr->end_index += add - remove; + } + } + + l = next; + } +} + +/** * pango_attr_list_splice: * @list: a #PangoAttrList * @other: another #PangoAttrList diff --git a/pango/pango-attributes.h b/pango/pango-attributes.h index 1f43c27f..6f021c06 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_update (PangoAttrList *list, + int pos, + int remove, + int add); PANGO_AVAILABLE_IN_1_2 PangoAttrList *pango_attr_list_filter (PangoAttrList *list, |