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- '\" $Header: /user6/ouster/wish/man/RCS/CrtSelHdlr.3,v 1.7 93/04/01 09:41:16 ouster Exp $ SPRITE (Berkeley)
- '\"
- .\" The definitions below are for supplemental macros used in Tcl/Tk
- .\" manual entries.
- .\"
- .\" .HS name section [date [version]]
- .\" Replacement for .TH in other man pages. See below for valid
- .\" section names.
- .\"
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- .\" and indent is equivalent to second arg of .IP (shouldn't ever be
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- .\" .AS [type [name]]
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- '\" # Heading for Tcl/Tk man pages
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- ..
- .HS Tk_CreateSelHandler tkc
- .BS
- .SH NAME
- Tk_CreateSelHandler, Tk_DeleteSelHandler \- arrange to handle requests for the primary selection
- .SH SYNOPSIS
- .nf
- \fB#include <tk.h>\fR
- .sp
- \fBTk_CreateSelHandler\fR(\fItkwin, target, proc, clientData, format\fR)
- .sp
- \fBTk_DeleteSelHandler\fR(\fItkwin, target\fR)
- .SH ARGUMENTS
- .AS Tk_SelectionProc clientData
- .AP Tk_Window tkwin in
- Window for which \fIproc\fR will provide selection information.
- .AP Atom target in
- Form in which \fIproc\fR can provide the selection (e.g. STRING
- or FILE_NAME). Corresponds to \fItype\fR arguments in \fBselection\fR
- commands.
- .AP Tk_SelectionProc *proc in
- Procedure to invoke whenever the selection is owned by \fItkwin\fR
- and the selection contents are requested in the format given by
- \fItarget\fR.
- .AP ClientData clientData in
- Arbitrary one-word value to pass to \fIproc\fR.
- .AP Atom format in
- If the selection requestor isn't in this process, \fIformat\fR determines
- the representation used to transmit the selection to its
- requestor.
- .BE
-
- .SH DESCRIPTION
- .PP
- \fBTk_CreateSelHandler\fR arranges for a particular procedure
- (\fIproc\fR) to be called whenever the selection is owned by
- \fItkwin\fR and the selection contents are requested in the
- form given by \fItarget\fR. \fITarget\fR should be one of
- the entries defined in the left column of Table 2 of the
- X Inter-Client Communication Conventions Manual (ICCCM) or
- any other form in which an application is willing to present
- the selection. The most common form is STRING.
- .PP
- \fIProc\fR should have arguments and result that match the
- type \fBTk_SelectionProc\fR:
- .nf
- .RS
- typedef int Tk_SelectionProc(
- .RS
- ClientData \fIclientData\fR,
- int \fIoffset\fR,
- char *\fIbuffer\fR,
- int \fImaxBytes\fR);
- .RE
- .RE
- .fi
- The \fIclientData\fP parameter to \fIproc\fR is a copy of the
- \fIclientData\fP argument given to \fBTk_CreateSelHandler\fR.
- Typically, \fIclientData\fR points to a data
- structure containing application-specific information that is
- needed to retrieve the selection. \fIOffset\fR specifies an
- offset position into the selection, \fIbuffer\fR specifies a
- location at which to copy information about the selection, and
- \fImaxBytes\fR specifies the amount of space available at
- \fIbuffer\fR. \fIProc\fR should place a NULL-terminated string
- at \fIbuffer\fR containing \fImaxBytes\fR or fewer characters
- (not including the terminating NULL), and it should return a
- count of the number of non-NULL characters stored at
- \fIbuffer\fR. If the selection no longer exists (e.g. it once
- existed but the user deleted the range of characters containing
- it), then \fIproc\fR should return -1.
- .PP
- When transferring large selections, Tk will break them up into
- smaller pieces (typically a few thousand bytes each) for more
- efficient transmision. It will do this by calling \fIproc\fR
- one or more times, using successively higher values of \fIoffset\fR
- to retrieve successive portions of the selection. If \fIproc\fR
- returns a count less than \fImaxBytes\fR it means that the entire
- remainder of the selection has been returned. If \fIproc\fR's return
- value is \fImaxBytes\fR it means there may be additional information
- in the selection, so Tk must make another call to \fIproc\fR to
- retrieve the next portion.
- .PP
- \fIProc\fR always returns selection information in the form of a
- character string. However, the ICCCM allows for information to
- be transmitted from the selection owner to the selection requestor
- in any of several formats, such as a string, an array of atoms, an
- array of integers, etc. The \fIformat\fR argument to
- \fBTk_CreateSelHandler\fR indicates what format should be used to
- transmit the selection to its requestor (see the middle column of
- Table 2 of the ICCCM for examples). If \fIformat\fR is not
- STRING, then Tk will take the value returned by \fIproc\fR and divided
- it into fields separated by white space. If \fIformat\fR is ATOM,
- then Tk will return the selection as an array of atoms, with each
- field in \fIproc\fR's result treated as the name of one atom. For
- any other value of \fIformat\fR, Tk will return the selection as an
- array of 32-bit values where each field of \fIproc\fR's result is
- treated as a number and translated to a 32-bit value. In any event,
- the \fIformat\fR atom is returned to the selection requestor along
- with the contents of the selection.
- .PP
- If \fBTk_CreateSelHandler\fR is called when there already exists a
- handler for \fItarget\fR on \fItkwin\fR, then the existing handler
- is replaced with a new one.
- .PP
- \fBTk_DeleteSelHandler\fR removes the handler given by \fItkwin\fR
- .VS
- and \fItarget\fR, if such a handler exists. If there is no such
- handler then it has no effect.
- .VE
-
- .SH KEYWORDS
- format, handler, selection, target
-