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425 lines
9.9 KiB
C
425 lines
9.9 KiB
C
/*
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* tclMacNotify.c --
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*
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* This file contains Macintosh-specific procedures for the notifier,
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* which is the lowest-level part of the Tcl event loop. This file
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* works together with ../generic/tclNotify.c.
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*
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* Copyright (c) 1995-1996 Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tclMacNotify.c 1.36 97/05/07 19:09:29
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*/
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#include "tclInt.h"
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#include "tclPort.h"
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#include "tclMac.h"
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#include "tclMacInt.h"
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#include <signal.h>
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#include <Events.h>
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#include <LowMem.h>
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#include <Processes.h>
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#include <Timer.h>
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/*
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* This is necessary to work around a bug in Apple's Universal header files
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* for the CFM68K libraries.
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*/
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#ifdef __CFM68K__
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#undef GetEventQueue
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extern pascal QHdrPtr GetEventQueue(void)
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THREEWORDINLINE(0x2EBC, 0x0000, 0x014A);
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#pragma import list GetEventQueue
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#define GetEvQHdr() GetEventQueue()
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#endif
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/*
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* The follwing static indicates whether this module has been initialized.
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*/
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static int initialized = 0;
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/*
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* The following structure contains the state information for the
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* notifier module.
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*/
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static struct {
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int timerActive; /* 1 if timer is running. */
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Tcl_Time timer; /* Time when next timer event is expected. */
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int flags; /* OR'ed set of flags defined below. */
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Point lastMousePosition; /* Last known mouse location. */
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RgnHandle utilityRgn; /* Region used as the mouse region for
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* WaitNextEvent and the update region when
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* checking for events. */
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Tcl_MacConvertEventPtr eventProcPtr;
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/* This pointer holds the address of the
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* function that will handle all incoming
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* Macintosh events. */
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} notifier;
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/*
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* The following defines are used in the flags field of the notifier struct.
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*/
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#define NOTIFY_IDLE (1<<1) /* Tcl_ServiceIdle should be called. */
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#define NOTIFY_TIMER (1<<2) /* Tcl_ServiceTimer should be called. */
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/*
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* Prototypes for procedures that are referenced only in this file:
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*/
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static int HandleMacEvents _ANSI_ARGS_((void));
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static void InitNotifier _ANSI_ARGS_((void));
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static void NotifierExitHandler _ANSI_ARGS_((
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ClientData clientData));
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/*
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*----------------------------------------------------------------------
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*
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* InitNotifier --
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*
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* Initializes the notifier structure.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Creates a new exit handler.
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*
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*----------------------------------------------------------------------
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*/
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static void
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InitNotifier(void)
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{
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initialized = 1;
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memset(¬ifier, 0, sizeof(notifier));
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Tcl_CreateExitHandler(NotifierExitHandler, NULL);
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}
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/*
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*----------------------------------------------------------------------
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*
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* NotifierExitHandler --
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*
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* This function is called to cleanup the notifier state before
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* Tcl is unloaded.
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*
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* Results:
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* None.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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static void
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NotifierExitHandler(
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ClientData clientData) /* Not used. */
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{
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initialized = 0;
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}
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/*
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*----------------------------------------------------------------------
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*
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* HandleMacEvents --
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*
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* This function checks for events from the Macintosh event queue.
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*
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* Results:
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* Returns 1 if event found, 0 otherwise.
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*
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* Side effects:
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* Pulls events off of the Mac event queue and then calls
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* convertEventProc.
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*
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*----------------------------------------------------------------------
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*/
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static int
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HandleMacEvents(void)
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{
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EventRecord theEvent;
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int eventFound = 0, needsUpdate = 0;
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Point currentMouse;
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WindowRef windowRef;
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Rect mouseRect;
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/*
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* Check for mouse moved events. These events aren't placed on the
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* system event queue unless we call WaitNextEvent.
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*/
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GetGlobalMouse(¤tMouse);
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if ((notifier.eventProcPtr != NULL) &&
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!EqualPt(currentMouse, notifier.lastMousePosition)) {
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notifier.lastMousePosition = currentMouse;
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theEvent.what = nullEvent;
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if ((*notifier.eventProcPtr)(&theEvent) == true) {
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eventFound = 1;
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}
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}
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/*
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* Check for update events. Since update events aren't generated
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* until we call GetNextEvent, we may need to force a call to
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* GetNextEvent, even if the queue is empty.
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*/
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for (windowRef = FrontWindow(); windowRef != NULL;
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windowRef = GetNextWindow(windowRef)) {
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GetWindowUpdateRgn(windowRef, notifier.utilityRgn);
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if (!EmptyRgn(notifier.utilityRgn)) {
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needsUpdate = 1;
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break;
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}
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}
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/*
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* Process events from the OS event queue.
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*/
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while (needsUpdate || (GetEvQHdr()->qHead != NULL)) {
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GetGlobalMouse(¤tMouse);
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SetRect(&mouseRect, currentMouse.h, currentMouse.v,
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currentMouse.h + 1, currentMouse.v + 1);
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RectRgn(notifier.utilityRgn, &mouseRect);
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WaitNextEvent(everyEvent, &theEvent, 5, notifier.utilityRgn);
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needsUpdate = 0;
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if ((notifier.eventProcPtr != NULL)
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&& ((*notifier.eventProcPtr)(&theEvent) == true)) {
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eventFound = 1;
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}
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}
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return eventFound;
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_SetTimer --
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*
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* This procedure sets the current notifier timer value. The
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* notifier will ensure that Tcl_ServiceAll() is called after
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* the specified interval, even if no events have occurred.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Replaces any previous timer.
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*
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*----------------------------------------------------------------------
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*/
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void
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Tcl_SetTimer(
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Tcl_Time *timePtr) /* New value for interval timer. */
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{
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if (!timePtr) {
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notifier.timerActive = 0;
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} else {
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/*
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* Compute when the timer should fire.
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*/
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TclpGetTime(¬ifier.timer);
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notifier.timer.sec += timePtr->sec;
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notifier.timer.usec += timePtr->usec;
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if (notifier.timer.usec >= 1000000) {
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notifier.timer.usec -= 1000000;
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notifier.timer.sec += 1;
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}
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notifier.timerActive = 1;
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}
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_WaitForEvent --
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*
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* This function is called by Tcl_DoOneEvent to wait for new
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* events on the message queue. If the block time is 0, then
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* Tcl_WaitForEvent just polls the event queue without blocking.
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*
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* Results:
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* Always returns 0.
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*
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* Side effects:
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* None.
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*
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*----------------------------------------------------------------------
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*/
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int
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Tcl_WaitForEvent(
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Tcl_Time *timePtr) /* Maximum block time. */
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{
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int found;
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EventRecord macEvent;
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long sleepTime = 5;
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long ms;
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Point currentMouse;
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void * timerToken;
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Rect mouseRect;
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/*
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* Compute the next timeout value.
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*/
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if (!timePtr) {
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ms = INT_MAX;
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} else {
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ms = (timePtr->sec * 1000) + (timePtr->usec / 1000);
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}
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timerToken = TclMacStartTimer((long) ms);
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/*
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* Poll the Mac event sources. This loop repeats until something
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* happens: a timeout, a socket event, mouse motion, or some other
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* window event. Note that we don't call WaitNextEvent if another
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* event is found to avoid context switches. This effectively gives
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* events coming in via WaitNextEvent a slightly lower priority.
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*/
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found = 0;
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if (notifier.utilityRgn == NULL) {
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notifier.utilityRgn = NewRgn();
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}
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while (!found) {
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/*
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* Check for generated and queued events.
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*/
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if (HandleMacEvents()) {
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found = 1;
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}
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/*
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* Check for time out.
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*/
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if (!found && TclMacTimerExpired(timerToken)) {
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found = 1;
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}
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/*
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* Mod by Jack: poll for select() events. Code is in TclSelectNotify.c
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*/
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{
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int Tcl_PollSelectEvent(void);
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if (!found && Tcl_PollSelectEvent())
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found = 1;
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}
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/*
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* Check for window events. We may receive a NULL event for
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* various reasons. 1) the timer has expired, 2) a mouse moved
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* event is occuring or 3) the os is giving us time for idle
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* events. Note that we aren't sharing the processor very
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* well here. We really ought to do a better job of calling
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* WaitNextEvent for time slicing purposes.
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*/
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if (!found) {
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/*
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* Set up mouse region so we will wake if the mouse is moved.
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* We do this by defining the smallest possible region around
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* the current mouse position.
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*/
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GetGlobalMouse(¤tMouse);
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SetRect(&mouseRect, currentMouse.h, currentMouse.v,
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currentMouse.h + 1, currentMouse.v + 1);
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RectRgn(notifier.utilityRgn, &mouseRect);
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WaitNextEvent(everyEvent, &macEvent, sleepTime,
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notifier.utilityRgn);
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if (notifier.eventProcPtr != NULL) {
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if ((*notifier.eventProcPtr)(&macEvent) == true) {
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found = 1;
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}
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}
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}
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}
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TclMacRemoveTimer(timerToken);
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return 0;
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_Sleep --
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*
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* Delay execution for the specified number of milliseconds. This
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* is not a very good call to make. It will block the system -
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* you will not even be able to switch applications.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Time passes.
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*
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*----------------------------------------------------------------------
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*/
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void
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Tcl_Sleep(
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int ms) /* Number of milliseconds to sleep. */
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{
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EventRecord dummy;
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void *timerToken;
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if (ms <= 0) {
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return;
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}
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timerToken = TclMacStartTimer((long) ms);
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while (1) {
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WaitNextEvent(0, &dummy, (ms / 16.66) + 1, NULL);
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if (TclMacTimerExpired(timerToken)) {
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break;
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}
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}
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TclMacRemoveTimer(timerToken);
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}
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/*
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*----------------------------------------------------------------------
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*
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* Tcl_MacSetEventProc --
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*
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* This function sets the event handling procedure for the
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* application. This function will be passed all incoming Mac
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* events. This function usually controls the console or some
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* other entity like Tk.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Changes the event handling function.
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*
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*----------------------------------------------------------------------
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*/
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void
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Tcl_MacSetEventProc(
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Tcl_MacConvertEventPtr procPtr)
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{
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notifier.eventProcPtr = procPtr;
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}
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