cpython/Mac/tclmods/tclMacNotify.c
1998-08-18 14:51:27 +00:00

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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 1.36 97/05/07 19:09:29
*/
#include "tclInt.h"
#include "tclPort.h"
#include "tclMac.h"
#include "tclMacInt.h"
#include <signal.h>
#include <Events.h>
#include <LowMem.h>
#include <Processes.h>
#include <Timer.h>
/*
* This is necessary to work around a bug in Apple's Universal header files
* for the CFM68K libraries.
*/
#ifdef __CFM68K__
#undef GetEventQueue
extern pascal QHdrPtr GetEventQueue(void)
THREEWORDINLINE(0x2EBC, 0x0000, 0x014A);
#pragma import list GetEventQueue
#define GetEvQHdr() GetEventQueue()
#endif
/*
* The follwing static indicates whether this module has been initialized.
*/
static int initialized = 0;
/*
* The following structure contains the state information for the
* notifier module.
*/
static struct {
int timerActive; /* 1 if timer is running. */
Tcl_Time timer; /* Time when next timer event is expected. */
int flags; /* OR'ed set of flags defined below. */
Point lastMousePosition; /* Last known mouse location. */
RgnHandle utilityRgn; /* Region used as the mouse region for
* WaitNextEvent and the update region when
* checking for events. */
Tcl_MacConvertEventPtr eventProcPtr;
/* This pointer holds the address of the
* function that will handle all incoming
* Macintosh events. */
} notifier;
/*
* The following defines are used in the flags field of the notifier struct.
*/
#define NOTIFY_IDLE (1<<1) /* Tcl_ServiceIdle should be called. */
#define NOTIFY_TIMER (1<<2) /* Tcl_ServiceTimer should be called. */
/*
* Prototypes for procedures that are referenced only in this file:
*/
static int HandleMacEvents _ANSI_ARGS_((void));
static void InitNotifier _ANSI_ARGS_((void));
static void NotifierExitHandler _ANSI_ARGS_((
ClientData clientData));
/*
*----------------------------------------------------------------------
*
* InitNotifier --
*
* Initializes the notifier structure.
*
* Results:
* None.
*
* Side effects:
* Creates a new exit handler.
*
*----------------------------------------------------------------------
*/
static void
InitNotifier(void)
{
initialized = 1;
memset(&notifier, 0, sizeof(notifier));
Tcl_CreateExitHandler(NotifierExitHandler, NULL);
}
/*
*----------------------------------------------------------------------
*
* NotifierExitHandler --
*
* This function is called to cleanup the notifier state before
* Tcl is unloaded.
*
* Results:
* None.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
static void
NotifierExitHandler(
ClientData clientData) /* Not used. */
{
initialized = 0;
}
/*
*----------------------------------------------------------------------
*
* HandleMacEvents --
*
* This function checks for events from the Macintosh event queue.
*
* Results:
* Returns 1 if event found, 0 otherwise.
*
* Side effects:
* Pulls events off of the Mac event queue and then calls
* convertEventProc.
*
*----------------------------------------------------------------------
*/
static int
HandleMacEvents(void)
{
EventRecord theEvent;
int eventFound = 0, needsUpdate = 0;
Point currentMouse;
WindowRef windowRef;
Rect mouseRect;
/*
* Check for mouse moved events. These events aren't placed on the
* system event queue unless we call WaitNextEvent.
*/
GetGlobalMouse(&currentMouse);
if ((notifier.eventProcPtr != NULL) &&
!EqualPt(currentMouse, notifier.lastMousePosition)) {
notifier.lastMousePosition = currentMouse;
theEvent.what = nullEvent;
if ((*notifier.eventProcPtr)(&theEvent) == true) {
eventFound = 1;
}
}
/*
* Check for update events. Since update events aren't generated
* until we call GetNextEvent, we may need to force a call to
* GetNextEvent, even if the queue is empty.
*/
for (windowRef = FrontWindow(); windowRef != NULL;
windowRef = GetNextWindow(windowRef)) {
GetWindowUpdateRgn(windowRef, notifier.utilityRgn);
if (!EmptyRgn(notifier.utilityRgn)) {
needsUpdate = 1;
break;
}
}
/*
* Process events from the OS event queue.
*/
while (needsUpdate || (GetEvQHdr()->qHead != NULL)) {
GetGlobalMouse(&currentMouse);
SetRect(&mouseRect, currentMouse.h, currentMouse.v,
currentMouse.h + 1, currentMouse.v + 1);
RectRgn(notifier.utilityRgn, &mouseRect);
WaitNextEvent(everyEvent, &theEvent, 5, notifier.utilityRgn);
needsUpdate = 0;
if ((notifier.eventProcPtr != NULL)
&& ((*notifier.eventProcPtr)(&theEvent) == true)) {
eventFound = 1;
}
}
return eventFound;
}
/*
*----------------------------------------------------------------------
*
* Tcl_SetTimer --
*
* This procedure sets the current notifier timer value. The
* notifier will ensure that Tcl_ServiceAll() is called after
* the specified interval, even if no events have occurred.
*
* Results:
* None.
*
* Side effects:
* Replaces any previous timer.
*
*----------------------------------------------------------------------
*/
void
Tcl_SetTimer(
Tcl_Time *timePtr) /* New value for interval timer. */
{
if (!timePtr) {
notifier.timerActive = 0;
} else {
/*
* Compute when the timer should fire.
*/
TclpGetTime(&notifier.timer);
notifier.timer.sec += timePtr->sec;
notifier.timer.usec += timePtr->usec;
if (notifier.timer.usec >= 1000000) {
notifier.timer.usec -= 1000000;
notifier.timer.sec += 1;
}
notifier.timerActive = 1;
}
}
/*
*----------------------------------------------------------------------
*
* Tcl_WaitForEvent --
*
* This function is called by Tcl_DoOneEvent to wait for new
* events on the message queue. If the block time is 0, then
* Tcl_WaitForEvent just polls the event queue without blocking.
*
* Results:
* Always returns 0.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
Tcl_WaitForEvent(
Tcl_Time *timePtr) /* Maximum block time. */
{
int found;
EventRecord macEvent;
long sleepTime = 5;
long ms;
Point currentMouse;
void * timerToken;
Rect mouseRect;
/*
* Compute the next timeout value.
*/
if (!timePtr) {
ms = INT_MAX;
} else {
ms = (timePtr->sec * 1000) + (timePtr->usec / 1000);
}
timerToken = TclMacStartTimer((long) ms);
/*
* Poll the Mac event sources. This loop repeats until something
* happens: a timeout, a socket event, mouse motion, or some other
* window event. Note that we don't call WaitNextEvent if another
* event is found to avoid context switches. This effectively gives
* events coming in via WaitNextEvent a slightly lower priority.
*/
found = 0;
if (notifier.utilityRgn == NULL) {
notifier.utilityRgn = NewRgn();
}
while (!found) {
/*
* Check for generated and queued events.
*/
if (HandleMacEvents()) {
found = 1;
}
/*
* Check for time out.
*/
if (!found && TclMacTimerExpired(timerToken)) {
found = 1;
}
/*
* Mod by Jack: poll for select() events. Code is in TclSelectNotify.c
*/
{
int Tcl_PollSelectEvent(void);
if (!found && Tcl_PollSelectEvent())
found = 1;
}
/*
* 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. Note that we aren't sharing the processor very
* well here. We really ought to do a better job of calling
* WaitNextEvent for time slicing purposes.
*/
if (!found) {
/*
* 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.
*/
GetGlobalMouse(&currentMouse);
SetRect(&mouseRect, currentMouse.h, currentMouse.v,
currentMouse.h + 1, currentMouse.v + 1);
RectRgn(notifier.utilityRgn, &mouseRect);
WaitNextEvent(everyEvent, &macEvent, sleepTime,
notifier.utilityRgn);
if (notifier.eventProcPtr != NULL) {
if ((*notifier.eventProcPtr)(&macEvent) == true) {
found = 1;
}
}
}
}
TclMacRemoveTimer(timerToken);
return 0;
}
/*
*----------------------------------------------------------------------
*
* 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(
int ms) /* Number of milliseconds to sleep. */
{
EventRecord dummy;
void *timerToken;
if (ms <= 0) {
return;
}
timerToken = TclMacStartTimer((long) ms);
while (1) {
WaitNextEvent(0, &dummy, (ms / 16.66) + 1, NULL);
if (TclMacTimerExpired(timerToken)) {
break;
}
}
TclMacRemoveTimer(timerToken);
}
/*
*----------------------------------------------------------------------
*
* Tcl_MacSetEventProc --
*
* 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
Tcl_MacSetEventProc(
Tcl_MacConvertEventPtr procPtr)
{
notifier.eventProcPtr = procPtr;
}