Adding Attachments to Text
You can embed graphics or other
attachments in text in either of two ways: programmatically or directly
through user actions. In the programmatic approach, you can add
graphic objects using the NSText
method replaceCharactersInRange:withRTFD:
or through a more specific method defined by a subclass.
An alternate means of adding an image or other attachment
to the text is for the user to drag an image or other file directly
into the text object. The text object automatically creates an NSTextAttachment
object to manage
the display of the image. This feature requires a rich text object
that has been configured to receive dragged images using the NSText
method setImportsGraphics:
. (NSTextView
and NSTextField
also have implementations of this method.)
Images that have been imported can be written as part of an
RTFD document.
RTFD documents use a file package, or directory,
to store the components of the document (the “D” stands for
“directory”). The file package has the name of the document
plus an .rtfd
extension.
The file package always contains a file called TXT.rtf
for
the text of the document, and one or more TIFF or EPS files for
the images, plus the files for other attachments. A text object
can transfer information in an RTFD document to a file and read it
from a file using the NSText
methods writeRTFDToFile:atomically:
and readRTFDFromFile:
.
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