archie/tcl7.6/mac/tclMacNotify.c
2024-05-27 16:40:40 +02:00

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/*
* tclMacNotify.c --
*
* This file contains Macintosh-specific procedures for the notifier,
* which is the lowest-level part of the Tcl event loop. This file
* works together with ../generic/tclNotify.c.
*
* Copyright (c) 1995-1996 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* SCCS: @(#) tclMacNotify.c 1.32 96/08/15 16:18:01
*/
#include "tclInt.h"
#include "tclPort.h"
#include "tclMacInt.h"
#include <signal.h>
#include <Events.h>
#include <LowMem.h>
#include <Processes.h>
#include <Timer.h>
/*
* The following variable is a backdoor for use by Tk. It is set when
* Tk needs to process events on the Tcl event queue without reentering
* the system event loop. Tk uses it to flush the Tcl event queue.
*/
static int ignoreEvents = 0;
static Point lastMousePosition; /* The last known position of the cursor. */
TclMacConvertEventPtr convertEventProcPtr = NULL;
/* This pointer holds the address of the
* function that will handle all incoming
* Macintosh events. */
static RgnHandle utilityRgn = NULL;
/* Region used as the mouse region for
* WaitNextEvent and the update region when
* checking for events. */
/*
* Prototypes for procedures that are referenced only in this file:
*/
static int CheckEventsAvail _ANSI_ARGS_((void));
static void EventCheckProc _ANSI_ARGS_((ClientData clientData,
int flags));
static void EventSetupProc _ANSI_ARGS_((ClientData clientData,
int flags));
static int HandleMacEvents _ANSI_ARGS_((int flags));
/*
*----------------------------------------------------------------------
*
* TclMacFlushEvents --
*
* This function is a special purpose hack to allow Tk to
* process queued Window events during a recursive event loop
* without looking for new events on the system event queue.
*
* Results:
* None.
*
* Side effects:
* Services any pending Tcl events and calls idle handlers.
*
*----------------------------------------------------------------------
*/
void
TclMacFlushEvents(timePtr)
Tcl_Time *timePtr; /* Specifies the maximum amount of time
* that this procedure should spend processing
* events. The time is given as an
* interval, not an absolute wakeup time.
* NULL means return when queue is empty. */
{
long ms;
void * timerToken;
ms = (timePtr->sec * 1000) + (timePtr->usec / 1000);
timerToken = TclMacStartTimer((long) ms);
ignoreEvents = 1;
while (Tcl_DoOneEvent(TCL_DONT_WAIT|TCL_WINDOW_EVENTS|
TCL_TIMER_EVENTS|TCL_IDLE_EVENTS)) {
if (TclMacTimerExpired(timerToken)) {
break;
}
}
TclMacRemoveTimer(timerToken);
ignoreEvents = 0;
}
/*
*----------------------------------------------------------------------
*
* EventSetupProc --
*
* This procedure is part of the event source for the Macintosh.
* It is invoked by Tcl_DoOneEvent before it calls select to check
* for events on all displays.
*
* Results:
* None.
*
* Side effects:
* Tells the notifier which files should be waited for.
*
*----------------------------------------------------------------------
*/
static void
EventSetupProc(clientData, flags)
ClientData clientData; /* Not used. */
int flags; /* Flags passed to Tk_DoOneEvent:
* if it doesn't include
* TCL_WINDOW_EVENTS then we do
* nothing. */
{
static Tcl_Time dontBlock = {0, 0};
if (!(flags & TCL_WINDOW_EVENTS)) {
return;
}
if (CheckEventsAvail() == true) {
Tcl_SetMaxBlockTime(&dontBlock);
}
}
/*
*----------------------------------------------------------------------
*
* EventCheckProc --
*
* This procedure is the second part of the "event source" for
* the Macintosh. It is invoked by Tcl_DoOneEvent after it calls
* WaitNextEvent (or whatever it uses to wait for events).
*
* Results:
* None.
*
* Side effects:
* Makes entries on the Tcl event queue for all the events
* available on the Macintosh event queue.
*
*----------------------------------------------------------------------
*/
static void
EventCheckProc(clientData, flags)
ClientData clientData; /* Not used. */
int flags; /* Flags passed to Tk_DoOneEvent:
* if it doesn't include
* TCL_WINDOW_EVENTS then we do
* nothing. */
{
if (!(flags & TCL_WINDOW_EVENTS)) {
return;
}
if (CheckEventsAvail() == false) {
return;
}
HandleMacEvents(TCL_DONT_WAIT);
}
/*
*----------------------------------------------------------------------
*
* Tcl_WatchFile --
*
* Arrange for Tcl_DoOneEvent to include this file in the masks
* for the next call to select. This procedure is invoked by
* event sources, which are in turn invoked by Tcl_DoOneEvent
* before it invokes select.
*
* Results:
* None.
*
* Side effects:
*
* The notifier will generate a file event when the I/O channel
* given by fd next becomes ready in the way indicated by mask.
* If fd is already registered then the old mask will be replaced
* with the new one. Once the event is sent, the notifier will
* not send any more events about the fd until the next call to
* Tcl_NotifyFile.
*
*----------------------------------------------------------------------
*/
void
Tcl_WatchFile(file, mask)
Tcl_File file; /* Opaque identifier for a stream. */
int mask; /* OR'ed combination of TCL_READABLE,
* TCL_WRITABLE, and TCL_EXCEPTION:
* indicates conditions to wait for
* in select. */
{
int fd, type;
fd = (int) Tcl_GetFileInfo(file, &type);
if (type == TCL_MAC_SOCKET) {
TclMacWatchSocket(file, mask);
} else if (type == TCL_MAC_FILE) {
Tcl_Time timeout = { 0, 0 };
/*
* Currently, files are always ready under the Macintosh,
* so we just set a 0 timeout.
*/
Tcl_SetMaxBlockTime(&timeout);
} else if (type == TCL_UNIX_FD) {
Tcl_Time timeout = { 0, 0 };
/*
* The only types of files that should use TCL_UNIX_FD
* should be stdio files associated with a console. For,
* example CodeWarrior's SIOUX. In this case these files
* are non-blocking and always deemed ready.
*/
Tcl_SetMaxBlockTime(&timeout);
}
}
/*
*----------------------------------------------------------------------
*
* Tcl_FileReady --
*
* Indicates what conditions (readable, writable, etc.) were
* present on a file the last time the notifier invoked select.
* This procedure is typically invoked by event sources to see
* if they should queue events.
*
* Results:
* The return value is 0 if none of the conditions specified by mask
* was true for fd the last time the system checked. If any of the
* conditions were true, then the return value is a mask of those
* that were true.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
Tcl_FileReady(file, mask)
Tcl_File file; /* File handle for a stream. */
int mask; /* OR'ed combination of TCL_READABLE,
* TCL_WRITABLE, and TCL_EXCEPTION:
* indicates conditions caller cares about. */
{
int type;
int fd;
fd = (int) Tcl_GetFileInfo(file, &type);
if (type == TCL_MAC_SOCKET) {
return TclMacSocketReady(file, mask);
} else if (type == TCL_MAC_FILE) {
/*
* Under the Macintosh, files are always ready, so we just
* return the mask that was passed in.
*/
return mask;
} else if (type == TCL_UNIX_FD) {
/*
* Under the Macintosh, stdio files are always ready,
* so we just return the mask that was passed in.
*/
return mask;
}
return 0;
}
/*
*----------------------------------------------------------------------
*
* Tcl_WaitForEvent --
*
* This procedure does the lowest level wait for events in a
* platform-specific manner. It uses information provided by
* previous calls to Tcl_WatchFile, plus the timePtr argument,
* to determine what to wait for and how long to wait.
*
* Results:
* The return value is normally TCL_OK. However, if there are
* no events to wait for (e.g. no files and no timers) so that
* the procedure would block forever, then it returns TCL_ERROR.
*
* Side effects:
* May put the process to sleep for a while, depending on timePtr.
* When this procedure returns, an event of interest to the application
* has probably, but not necessarily, occurred.
*
*----------------------------------------------------------------------
*/
int
Tcl_WaitForEvent(timePtr)
Tcl_Time *timePtr; /* Specifies the maximum amount of time
* that this procedure should block before
* returning. The time is given as an
* interval, not an absolute wakeup time.
* NULL means block forever. */
{
int numFound, notDone = true;
EventRecord macEvent;
long sleepTime = 5;
long ms;
Point currentMouse;
void * timerToken;
Rect mouseRect;
/*
* If we are ignoring events from the system, just return immediately.
*/
if (ignoreEvents) {
return TCL_OK;
}
/*
* Calculate the end time, start the WaitNextEvent timer, and
* create any other data structures we may need.
*/
ms = (timePtr->sec * 1000) + (timePtr->usec / 1000);
if (ms < 10) {
notDone = true;
}
timerToken = TclMacStartTimer((long) ms);
if (utilityRgn == NULL) {
utilityRgn = NewRgn();
}
do {
/*
* Poll for file events.
*/
numFound = TclMacNotifySocket();
if (numFound > 0) {
notDone = false;
}
/*
* Check for time out.
*/
if (TclMacTimerExpired(timerToken)) {
notDone = false;
}
/*
* Check for mouse moved events. We need to do this seprately
* from and before WaitNextEvent to avoid waiting.
*/
GetGlobalMouse(&currentMouse);
if (!EqualPt(currentMouse, lastMousePosition)) {
lastMousePosition = currentMouse;
macEvent.what = nullEvent;
if (convertEventProcPtr != NULL) {
if ((*convertEventProcPtr)(&macEvent) == true) {
notDone = false;
}
}
}
/*
* Set up mouse region so we will wake if the mouse is moved. We
* do this by defining the smallest possible region around the
* current mouse position.
*/
SetRect(&mouseRect, currentMouse.h, currentMouse.v,
currentMouse.h + 1, currentMouse.v + 1);
RectRgn(utilityRgn, &mouseRect);
/*
* Check for window events. We may receive a NULL event for various
* reasons. 1) the timer has expired, 2) a mouse moved event is
* occuring or 3) the os is giving us time for idle events.
*/
if ((notDone == true) || (CheckEventsAvail() == true)) {
WaitNextEvent(everyEvent, &macEvent, sleepTime, utilityRgn);
if (convertEventProcPtr != NULL) {
if ((*convertEventProcPtr)(&macEvent) == true) {
notDone = false;
}
}
}
} while(notDone == true);
TclMacRemoveTimer(timerToken);
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* Tcl_Sleep --
*
* Delay execution for the specified number of milliseconds. This
* is not a very good call to make. It will block the system -
* you will not even be able to switch applications.
*
* Results:
* None.
*
* Side effects:
* Time passes.
*
*----------------------------------------------------------------------
*/
void
Tcl_Sleep(ms)
int ms; /* Number of milliseconds to sleep. */
{
EventRecord dummy;
int done = false;
void *timerToken;
if (ms <= 0) {
return;
}
timerToken = TclMacStartTimer((long) ms);
do {
WaitNextEvent(0, &dummy, (ms / 16.66) + 1, NULL);
if (TclMacTimerExpired(timerToken)) {
break;
}
} while(!done);
TclMacRemoveTimer(timerToken);
}
/*
*----------------------------------------------------------------------
*
* CheckEventsAvail --
*
* Checks to see if events are available on the Macintosh queue.
* This function looks for both queued events (eg. key & button)
* and generated events (update & mouse moved).
*
* Results:
* True is events exist, false otherwise.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static int
CheckEventsAvail()
{
QHdrPtr evPtr;
WindowRef windowRef;
Point currentMouse;
evPtr = GetEvQHdr();
if (evPtr->qHead != NULL) {
return true;
}
if (utilityRgn == NULL) {
utilityRgn = NewRgn();
}
windowRef = FrontWindow();
while (windowRef != NULL) {
GetWindowUpdateRgn(windowRef, utilityRgn);
if (!EmptyRgn(utilityRgn)) {
return true;
}
windowRef = GetNextWindow(windowRef);
}
GetGlobalMouse(&currentMouse);
if (!EqualPt(currentMouse, lastMousePosition)) {
return true;
}
return false;
}
/*
*----------------------------------------------------------------------
*
* TclCreateMacEventSource --
*
* This procedure is called during Tcl initialization to create
* the event source for Macintosh window events.
*
* Results:
* None.
*
* Side effects:
* A new event source is created.
*
*----------------------------------------------------------------------
*/
void
TclCreateMacEventSource()
{
static int initialized = 0;
if (!initialized) {
Tcl_CreateEventSource(EventSetupProc, EventCheckProc,
(ClientData) NULL);
initialized = 1;
}
}
/*
*----------------------------------------------------------------------
*
* HandleMacEvents --
*
* This function checks for events from the Macintosh event queue.
* It also is the point at which the Tcl application must provide
* cooprative multitasking with other Macintosh applications. Mac
* events are then translated into the appropiate X events and
* placed on the Tk event queue.
*
* Results:
* Returns 1 if event found, 0 otherwise.
*
* Side effects:
* May change the grab module settings.
*
*----------------------------------------------------------------------
*/
int
HandleMacEvents(flags)
int flags;
{
EventRecord theEvent;
int eventFound = false;
int eventToProcess = false;
Point currentMouse;
/*
* If the TCL_DONT_WAIT flag is set then we first check to see
* events are available and simple return if none will be found.
* If the event in question is a motion event we need to handle
* it first - otherwise, GetNextEvent may block.
*/
GetGlobalMouse(&currentMouse);
if (!EqualPt(currentMouse, lastMousePosition) &&
(convertEventProcPtr != NULL)) {
lastMousePosition = currentMouse;
theEvent.what = nullEvent;
eventFound |= (*convertEventProcPtr)(&theEvent);
}
if (flags & TCL_DONT_WAIT) {
if (CheckEventsAvail() == false) {
return eventFound;
}
}
do {
GetNextEvent(everyEvent, &theEvent);
if (convertEventProcPtr != NULL) {
eventFound |= (*convertEventProcPtr)(&theEvent);
}
} while (CheckEventsAvail() == true);
return eventFound;
}
/*
*----------------------------------------------------------------------
*
* TclMacSetEventProc --
*
* This function sets the event handling procedure for the
* application. This function will be passed all incoming Mac
* events. This function usually controls the console or some
* other entity like Tk.
*
* Results:
* None.
*
* Side effects:
* Changes the event handling function.
*
*----------------------------------------------------------------------
*/
void
TclMacSetEventProc(procPtr)
TclMacConvertEventPtr procPtr;
{
convertEventProcPtr = procPtr;
}