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- '\" $Header: /user6/ouster/wish/man/RCS/selection.n,v 1.8 93/04/01 09:52:55 ouster Exp $ SPRITE (Berkeley)
- '/"
- .\" The definitions below are for supplemental macros used in Tcl/Tk
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- .HS selection tk
- .BS
- '\" Note: do not modify the .SH NAME line immediately below!
- .SH NAME
- selection \- Manipulate the X selection
- .SH SYNOPSIS
- \fBselection \fIoption\fR ?\fIarg arg ...\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 first argument to \fBselection\fR determines the format of the
- rest of the arguments and the behavior of the command. The following
- forms are currently supported:
- .TP
- \fBselection clear \fIwindow\fR
- .VS
- If there is a selection anywhere on \fIwindow\fR's display, clear it
- so that no window owns the selection anymore. Returns an empty string.
- .VE
- .TP
- \fBselection get \fR?\fItype\fR?
- 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.
- .TP
- \fBselection handle \fIwindow command \fR?\fItype\fR? ?\fIformat\fR?
- Creates a handler for selection requests, such that \fIcommand\fR will
- 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.
- .VS
- If \fIcommand\fR is an empty string then any existing handler for
- \fIwindow\fR and \fItype\fR is removed.
- .VE
- .RS
- .PP
- When the selection is requested and \fIwindow\fR is the selection owner
- and \fItype\fR is the requested type, \fIcommand\fR will be executed
- as a Tcl command with two additional numbers appended to it
- (with space separators). 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
- If \fIcommand\fR returns an error then the selection retrieval is rejected
- .VS
- just as if the selection didn't exist at all.
- .VE
- .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.
- .RE
- .TP
- \fBselection own \fR?\fIwindow\fR? ?\fIcommand\fR?
- .VS
- If \fIwindow\fR is specified, then it becomes the new selection owner
- and the command returns an empty string as result.
- The existing owner, if any, is notified that it has lost the selection.
- If \fIcommand\fR is specified, it is a Tcl script to execute when
- some other window claims ownership of the selection away from
- \fIwindow\fR.
- If neither \fIwindow\fR nor \fIcommand\fR is specified then
- the command returns the path name of the window in this application
- that owns the selection, or an empty string if no window in this
- application owns the selection.
- .VE
-
- .SH KEYWORDS
- clear, format, handler, ICCCM, own, selection, target, type
-