TextBufferCommitNotify
Description:
[ Version ( since = "4.16" ) ]
public delegate void TextBufferCommitNotify (TextBuffer buffer, TextBufferNotifyFlags flags, uint position, uint length)
A notification callback used by [method@Gtk.
TextBuffer.add_commit_notify].
You may not modify the [class@Gtk.TextBuffer] from a [callback@Gtk.TextBufferCommitNotify] callback and that is enforced by the [ class@Gtk.TextBuffer] API.
[callback@Gtk.TextBufferCommitNotify] may be used to be notified about changes to the underlying buffer right before-or-after the changes are committed to the underlying B-Tree. This is useful if you want to observe changes to the buffer without other signal handlers potentially modifying state on the way to the default signal handler.
When flags is `GTK_TEXT_BUFFER_NOTIFY_BEFORE_INSERT`, `position` is set to the offset in characters from the start of the buffer
where the insertion will occur. `length` is set to the number of characters to be inserted. You may not yet retrieve the text until it has been
inserted. You may access the text from `GTK_TEXT_BUFFER_NOTIFY_AFTER_INSERT` using [method@Gtk.TextBuffer.get_slice].
When flags is `GTK_TEXT_BUFFER_NOTIFY_AFTER_INSERT`, `position` is set to offset in characters where the insertion occurred and
`length` is set to the number of characters inserted.
When flags is `GTK_TEXT_BUFFER_NOTIFY_BEFORE_DELETE`, `position` is set to offset in characters where the deletion will occur and
`length` is set to the number of characters that will be removed. You may still retrieve the text from this handler using `position` and
`length`.
When flags is `GTK_TEXT_BUFFER_NOTIFY_AFTER_DELETE`, `length` is set to zero to denote that the delete-range has already been
committed to the underlying B-Tree. You may no longer retrieve the text that has been deleted from the [class@Gtk.TextBuffer].
Parameters:
| buffer |
the text buffer being notified |
| flags |
the type of commit notification |
| position |
the position of the text operation |
| length |
the length of the text operation in characters |
| user_data |
user data passed to the callback |