June 1994
Intermediate to advanced
821 pages
24h 40m
English
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12.5 Cut Buffers
Cut buffers are provided as a simple but limited method of communication between applications. Cut buffers are particularly good for editors, because they can act like a stack of buffers, recording the history of deletions.
The selection mechanism is superior for many applications, since it allows communication regarding the type of the data transferred. Selections are described in 12.4 Selections. It is also possible for an application to use both cut buffers and selections.
The cut buffers are eight properties on the root window of screen 0 of a server. The buffers are numbered 0 to 7. Cut buffers rely on a prior agreement between the two clients regarding the format of the data to be placed in the cut buffers. The data that can be placed in a single cut buffer is limited to the maximum size of a single property, which is server-dependent.
Because the cut buffers are properties, it is possible to be
notified when they have been written into.
PropertyNotify events can assist applications in
timing their communication. These are selected with
PropertyChangeMask.
The functions that are used to read and write to cut buffers are
XFetchBuffer(), XFetchBytes(),
XStoreBuffer(), and XStoreBytes().
The routines with Bytes in the name use cut buffer 0
only, while the others may use any of the eight.
XRotateBuffers() moves the contents of the eight
buffers any number of positions.
The cut buffer properties are named by the predefined atoms
XA_CUT_BUFFER0 to
XA_CUT_BUFFER7.
The ...
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