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- '\" Copyright 1990 Regents of the University of California
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- '\" $Header: /user6/ouster/wish/man/RCS/selection.man,v 1.4 91/12/06 10:42:55 ouster Exp $ SPRITE (Berkeley)
- '/"
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- .HS selection cmds
- .BS
- '\" Note: do not modify the .SH NAME line immediately below!
- .SH NAME
- selection \- Manipulate the X selection
- .SH SYNOPSIS
- \fBselection get \fR?\fItype\fR?
- .sp
- \fBselection handle \fIwindow command \fR?\fItype\fR? ?\fIformat\fR?
- .BE
-
- .SH DESCRIPTION
- .PP
- This command provides a Tcl interface to the X selection mechanism and
- implements the full selection functionality described in the
- X Inter-Client Communication Conventions Manual (ICCCM), except that it
- supports only the primary selection.
- .PP
- The \fBselection get\fR form of the command retrieves the value
- of the primary selection and returns it as a result.
- \fBType\fR specifies the form in which the selection is to be
- returned (the desired ``target'' for conversion, in ICCCM
- terminology), and should be an
- atom name such as STRING or FILE_NAME; see the Inter-Client
- Communication Conventions Manual for complete details.
- \fBType\fR defaults to STRING. The selection owner may choose to
- return the selection in any of several different representation
- formats, such as STRING, ATOM, INTEGER, etc. (this format is
- different than the selection type; see the ICCCM for all the
- confusing details). If the selection is returned in
- a non-string format, such as INTEGER or ATOM, the \fBselection\fR
- command converts it to string format as a collection of fields
- separated by spaces: atoms are converted to their
- textual names, and anything else is converted to hexadecimal
- integers.
- .PP
- The \fBselection handle\fR command creates a handler for selection requests:
- it arranges for \fIcommand\fR to be executed
- whenever the primary selection is
- owned by \fIwindow\fR and someone attempts to retrieve it in the form
- given by \fItype\fR (e.g. \fItype\fR is specified in the \fBselection get\fR
- command). \fIType\fR defaults to STRING.
- .PP
- When the retrieval occurs, two additional numbers will be
- appended to \fIcommand\fR (with space separators), and the resulting
- string will be executed as a Tcl command. The two additional numbers
- are \fIoffset\fR and \fImaxBytes\fR: \fIoffset\fR specifies a starting
- character position in the selection and \fImaxBytes\fR gives the maximum
- number of bytes to retrieve. The command should return a value consisting
- of at most \fImaxBytes\fR of the selection, starting at position
- \fIoffset\fR. For very large selections (larger than \fImaxBytes\fR)
- the selection will be retrieved using several invocations of \fIcommand\fR
- with increasing \fIoffset\fR values. If \fIcommand\fR returns a string
- whose length is less than \fImaxBytes\fR, the return value is assumed to
- include all of the remainder of the selection; if the length of
- \fIcommand\fR's result is equal to \fImaxBytes\fR then
- \fIcommand\fR will be invoked again, until it eventually
- returns a result shorter than \fImaxBytes\fR. The value of \fImaxBytes\fR
- will always be relatively large (thousands of bytes).
- .PP
- The \fIformat\fR argument specifies the representation that should be
- used to transmit the selection to the requester (the second column of
- Table 2 of the ICCCM), and defaults to STRING. If \fIformat\fR is
- STRING, the selection is transmitted as 8-bit ASCII characters (i.e.
- just in the form returned by \fIcommand\fR). If \fIformat\fR is
- ATOM, then the return value from \fIcommand\fR is divided into fields
- separated by white space; each field is converted to its atom value,
- and the 32-bit atom value is transmitted instead of the atom name.
- For any other \fIformat\fR, the return value from \fIcommand\fR is
- divided into fields separated by white space and each field is
- converted to a 32-bit integer; an array of integers is transmitted
- to the selection requester.
- .PP
- The \fIformat\fR argument is needed only for compatibility with
- selection requesters that don't use Tk. If the Tk toolkit is being
- used to retrieve the selection then the value is converted back to
- a string at the requesting end, so \fIformat\fR is
- irrelevant.
- .PP
- If no handler has been declared for type TARGETS or type TIMESTAMP,
- Tk will automatically respond to selection requests for these types.
-
- .SH KEYWORDS
- format, handler, ICCCM, selection, target, type
-