Initial revision

1 files changed, 416 insertions, 0 deletions

diff --git a/mac/tclMacNotify.c b/mac/tclMacNotify.c
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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;
+	}
+
+	/*
+	 * 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;
+}