on-insert

Called before a given range is inserted into the buffer. If the return value is #f, then the insert will be aborted. Otherwise, after-insert is guaranteed to be called after the insert has completed.

The buffer is internally locked for writing during a call to this method (see also Locks). Use after-insert to modify the buffer, if necessary.

See also on-edit-sequence.

• (send a-mred:media-text-edit on-insert s l) -> void
      s : int
      l : int

  Calls the superclass's on-insert and then calls the callback for the text box control.