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/*
* tkMacWinMenu.c --
*
* This module implements the common elements of the Mac and Windows
* specific features of menus. This file is not used for UNIX.
*
* Copyright (c) 1996-1997 by Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tkInt.h"
#include "tkMenu.h"
typedef struct {
int postCommandGeneration;
} ThreadSpecificData;
static Tcl_ThreadDataKey dataKey;
static int PreprocessMenu(TkMenu *menuPtr);
/*
*----------------------------------------------------------------------
*
* PreprocessMenu --
*
* The guts of the preprocessing. Recursive.
*
* Results:
* The return value is a standard Tcl result (errors can occur while the
* postcommands are being processed).
*
* Side effects:
* Since commands can get executed while this routine is being executed,
* the entire world can change.
*
*----------------------------------------------------------------------
*/
static int
PreprocessMenu(
TkMenu *menuPtr)
{
int index, result, finished;
ThreadSpecificData *tsdPtr =
Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
Tcl_Preserve(menuPtr);
/*
* First, let's process the post command on ourselves. If this command
* destroys this menu, or if there was an error, we are done.
*/
result = TkPostCommand(menuPtr);
if ((result != TCL_OK) || (menuPtr->tkwin == NULL)) {
goto done;
}
/*
* Now, we go through structure and process all of the commands. Since the
* structure is changing, we stop after we do one command, and start over.
* When we get through without doing any, we are done.
*/
do {
finished = 1;
for (index = 0; index < menuPtr->numEntries; index++) {
register TkMenuEntry *entryPtr = menuPtr->entries[index];
if ((entryPtr->type == CASCADE_ENTRY)
&& (entryPtr->namePtr != NULL)
&& (entryPtr->childMenuRefPtr != NULL)
&& (entryPtr->childMenuRefPtr->menuPtr != NULL)) {
TkMenu *cascadeMenuPtr = entryPtr->childMenuRefPtr->menuPtr;
if (cascadeMenuPtr->postCommandGeneration !=
tsdPtr->postCommandGeneration) {
cascadeMenuPtr->postCommandGeneration =
tsdPtr->postCommandGeneration;
result = PreprocessMenu(cascadeMenuPtr);
if (result != TCL_OK) {
goto done;
}
finished = 0;
break;
}
}
}
} while (!finished);
done:
Tcl_Release(menuPtr);
return result;
}
/*
*----------------------------------------------------------------------
*
* TkPreprocessMenu --
*
* On the Mac and on Windows, all of the postcommand processing has to be
* done on the entire tree underneath the main window to be posted. This
* means that we have to traverse the menu tree and issue the
* postcommands for all of the menus that have cascades attached. Since
* the postcommands can change the menu structure while we are
* traversing, we have to be extremely careful. Basically, the idea is to
* traverse the structure until we succesfully process one postcommand.
* Then we start over, and do it again until we traverse the whole
* structure without processing any postcommands.
*
* We are also going to set up the cascade back pointers in here since we
* have to traverse the entire structure underneath the menu anyway. We
* can clear the postcommand marks while we do that.
*
* Results:
* The return value is a standard Tcl result (errors can occur while the
* postcommands are being processed).
*
* Side effects:
* Since commands can get executed while this routine is being executed,
* the entire world can change.
*
*----------------------------------------------------------------------
*/
int
TkPreprocessMenu(
TkMenu *menuPtr)
{
ThreadSpecificData *tsdPtr =
Tcl_GetThreadData(&dataKey, sizeof(ThreadSpecificData));
tsdPtr->postCommandGeneration++;
menuPtr->postCommandGeneration = tsdPtr->postCommandGeneration;
return PreprocessMenu(menuPtr);
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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