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/*
* ------------------------------------------------------------------------
* PACKAGE: [incr Tk]
* DESCRIPTION: Building mega-widgets with [incr Tcl]
*
* [incr Tk] provides a framework for building composite "mega-widgets"
* using [incr Tcl] classes. It defines a set of base classes that are
* specialized to create all other widgets.
*
* This file defines the initialization and facilities common to all
* mega-widgets.
*
* ========================================================================
* AUTHOR: Michael J. McLennan
* Bell Labs Innovations for Lucent Technologies
* mmclennan@lucent.com
* http://www.tcltk.com/itcl
* ========================================================================
* Copyright (c) 1993-1998 Lucent Technologies, Inc.
* ------------------------------------------------------------------------
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "itkInt.h"
/*
* ------------------------------------------------------------------------
* Itk_ConfigBodyCmd()
*
* Replacement for the usual "itcl::configbody" command. Recognizes
* mega-widget options included in a class definition. Options are
* identified by their "switch" name, but without the "-" prefix:
*
* itcl::configbody <class>::<itkOption> <body>
*
* Handles bodies for public variables as well:
*
* itcl::configbody <class>::<publicVar> <body>
*
* If an <itkOption> is found, it has priority over public variables.
* If <body> has the form "@name" then it is treated as a reference
* to a C handling procedure; otherwise, it is taken as a body of
* Tcl statements.
*
* Returns TCL_OK/TCL_ERROR to indicate success/failure.
* ------------------------------------------------------------------------
*/
int
Itk_ConfigBodyCmd(
void *dummy, /* unused */
Tcl_Interp *interp, /* current interpreter */
int objc, /* number of arguments */
Tcl_Obj *const objv[]) /* argument objects */
{
int result = TCL_OK;
char *token;
const char *head;
const char *tail;
ItclClass *iclsPtr;
ItclMemberCode *mcode;
ItkClassOptTable *optTable;
Tcl_HashEntry *entry;
ItkClassOption *opt;
Tcl_DString buffer;
if (objc != 3) {
Tcl_WrongNumArgs(interp, 1, objv, "class::option body");
return TCL_ERROR;
}
/*
* Parse the member name "namesp::namesp::class::option".
* Make sure that a class name was specified, and that the
* class exists.
*/
token = Tcl_GetString(objv[1]);
Itcl_ParseNamespPath(token, &buffer, &head, &tail);
if (!head || *head == '\0') {
Tcl_AppendStringsToObj(Tcl_GetObjResult(interp),
"missing class specifier for body declaration \"", token, "\"",
(char*)NULL);
result = TCL_ERROR;
goto configBodyCmdDone;
}
iclsPtr = Itcl_FindClass(interp, head, /* autoload */ 1);
if (iclsPtr == NULL) {
result = TCL_ERROR;
goto configBodyCmdDone;
}
/*
* Look first for a configuration option with that name.
* If it is not found, assume the reference is for a public
* variable, and use the usual "configbody" implementation
* to handle it.
*/
optTable = Itk_FindClassOptTable(iclsPtr);
opt = NULL;
if (optTable) {
Tcl_DString optName;
Tcl_DStringInit(&optName);
Tcl_DStringAppend(&optName, "-", -1);
Tcl_DStringAppend(&optName, tail, -1);
entry = Tcl_FindHashEntry(&optTable->options,
Tcl_DStringValue(&optName));
if (entry) {
opt = (ItkClassOption*)Tcl_GetHashValue(entry);
}
Tcl_DStringFree(&optName);
}
if (opt == NULL) {
result = Itcl_ConfigBodyCmd(dummy, interp, objc, objv);
goto configBodyCmdDone;
}
/*
* Otherwise, change the implementation for this option.
*/
token = Tcl_GetString(objv[2]);
if (Itcl_CreateMemberCode(interp, iclsPtr, (char*)NULL, token,
&mcode) != TCL_OK) {
result = TCL_ERROR;
goto configBodyCmdDone;
}
Itcl_PreserveData((void *)mcode);
#ifdef NOTDEF
Itcl_EventuallyFree((void *)mcode, (Tcl_FreeProc *)Itcl_DeleteMemberCode);
#endif
if (opt->codePtr) {
Itcl_ReleaseData((void *)opt->codePtr);
}
opt->codePtr = mcode;
configBodyCmdDone:
Tcl_DStringFree(&buffer);
return result;
}
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