Cleanup and simplification of memory management in event loop; now works more smoothly; thanks to Marc Culler for patches

1 files changed, 50 insertions, 66 deletions

diff --git a/macosx/tkMacOSXNotify.c b/macosx/tkMacOSXNotify.c
index d35427a..6a4e6c1 100644
--- a/macosx/tkMacOSXNotify.c
+++ b/macosx/tkMacOSXNotify.c
@@ -18,9 +18,9 @@
 #include <pthread.h>
 #import <objc/objc-auto.h>
 
+/* This is not used for anything at the moment. */
 typedef struct ThreadSpecificData {
-    int initialized, sendEventNestingLevel;
-    NSEvent *currentEvent;
+    int initialized;
 } ThreadSpecificData;
 static Tcl_ThreadDataKey dataKey;
 
@@ -34,6 +34,7 @@ static void TkMacOSXEventsCheckProc(ClientData clientData, int flags);
 #pragma mark TKApplication(TKNotify)
 
 @interface NSApplication(TKNotify)
+/* We need to declare this hidden method. */
 - (void)_modalSession:(NSModalSession)session sendEvent:(NSEvent *)event;
 @end
 
@@ -47,35 +48,28 @@ static void TkMacOSXEventsCheckProc(ClientData clientData, int flags);
 @end
 
 @implementation TKApplication(TKNotify)
+/* Redisplay all of our windows, then call super. */
 - (NSEvent *)nextEventMatchingMask:(NSUInteger)mask
 	untilDate:(NSDate *)expiration inMode:(NSString *)mode
 	dequeue:(BOOL)deqFlag {
     NSAutoreleasePool *pool = [NSAutoreleasePool new];
     [NSApp makeWindowsPerform:@selector(tkDisplayIfNeeded) inOrder:NO];
-    int oldMode = Tcl_SetServiceMode(TCL_SERVICE_ALL);
-    NSEvent *event = [[super nextEventMatchingMask:mask untilDate:expiration
-	    inMode:mode dequeue:deqFlag] retain];
-    Tcl_SetServiceMode(oldMode);
-    if (event) {
-	TSD_INIT();
-	if (tsdPtr->sendEventNestingLevel) {
-	    if (![NSApp tkProcessEvent:event]) {
-		[event release];
-		event = nil;
-	    }
-	}
-    }
     [pool drain];
-    return [event autorelease];
+    NSEvent *event = [super nextEventMatchingMask:mask
+					untilDate:expiration
+					   inMode:mode
+					  dequeue:deqFlag];
+    return event;
 }
+
+ /*
+ * Call super then check the pasteboard.
+  */
 - (void)sendEvent:(NSEvent *)theEvent {
-    TSD_INIT();
-    int oldMode = Tcl_SetServiceMode(TCL_SERVICE_ALL);
-    tsdPtr->sendEventNestingLevel++;
+    NSAutoreleasePool *pool = [NSAutoreleasePool new];
     [super sendEvent:theEvent];
-    tsdPtr->sendEventNestingLevel--;
-    Tcl_SetServiceMode(oldMode);
     [NSApp tkCheckPasteboard];
+    [pool drain];
 }
 @end
 
@@ -152,7 +146,8 @@ Tk_MacOSXSetupTkNotifier(void)
 		    "first [load] of TkAqua has to occur in the main thread!");
 	    }
 	    Tcl_CreateEventSource(TkMacOSXEventsSetupProc,
-		    TkMacOSXEventsCheckProc, GetMainEventQueue());
+				  TkMacOSXEventsCheckProc,
+				  GetMainEventQueue());
 	    TkCreateExitHandler(TkMacOSXNotifyExitHandler, NULL);
 	    Tcl_SetServiceMode(TCL_SERVICE_ALL);
 	    TclMacOSXNotifierAddRunLoopMode(NSEventTrackingRunLoopMode);
@@ -184,7 +179,8 @@ TkMacOSXNotifyExitHandler(
 {
     TSD_INIT();
     Tcl_DeleteEventSource(TkMacOSXEventsSetupProc,
-	    TkMacOSXEventsCheckProc, GetMainEventQueue());
+			  TkMacOSXEventsCheckProc,
+			  GetMainEventQueue());
     tsdPtr->initialized = 0;
 }
 
@@ -193,16 +189,19 @@ TkMacOSXNotifyExitHandler(
  *
  * TkMacOSXEventsSetupProc --
  *
- *	This procedure implements the setup part of the TkAqua Events event
- *	source. It is invoked by Tcl_DoOneEvent before entering the notifier
- *	to check for events.
+ *	This procedure implements the setup part of the MacOSX event
+ *	source. It is invoked by Tcl_DoOneEvent before calling 
+ *      TkMacOSXEventsProc to process all queued NSEvents.  In our
+ *      case, all we need to do is to set the Tcl MaxBlockTime to
+ *      0 before starting the loop to process all queued NSEvents.
  *
  * Results:
  *	None.
  *
  * Side effects:
- *	If TkAqua events are queued, then the maximum block time will be set
- *	to 0 to ensure that the notifier returns control to Tcl.
+ *      
+ *	If NSEvents are queued, then the maximum block time will be set
+ *	to 0 to ensure that control returns immediately to Tcl.
  *
  *----------------------------------------------------------------------
  */
@@ -213,20 +212,14 @@ TkMacOSXEventsSetupProc(
     int flags)
 {
     if (flags & TCL_WINDOW_EVENTS &&
-	    ![[NSRunLoop currentRunLoop] currentMode]) {
+	![[NSRunLoop currentRunLoop] currentMode]) {
 	static Tcl_Time zeroBlockTime = { 0, 0 };
-
-	TSD_INIT();
-	if (!tsdPtr->currentEvent) {
-	    NSEvent *currentEvent = [NSApp nextEventMatchingMask:NSAnyEventMask
-		    untilDate:[NSDate distantPast]
-		    inMode:GetRunLoopMode(TkMacOSXGetModalSession())
-		    dequeue:YES];
-	    if (currentEvent) {
-		tsdPtr->currentEvent = [currentEvent retain];
-	    }
-	}
-	if (tsdPtr->currentEvent) {
+ 	/* Call this with dequeue=NO -- just checking if the queue is empty. */ 
+	NSEvent *currentEvent = [NSApp nextEventMatchingMask:NSAnyEventMask
+ 						   untilDate:[NSDate distantPast]
+ 						      inMode:GetRunLoopMode(TkMacOSXGetModalSession())
+ 						     dequeue:NO];
+	if (currentEvent) {
 	    Tcl_SetMaxBlockTime(&zeroBlockTime);
 	}
     }
@@ -237,17 +230,18 @@ TkMacOSXEventsSetupProc(
  *
  * TkMacOSXEventsCheckProc --
  *
- *	This procedure processes events sitting in the TkAqua event queue.
+ *	This procedure loops through all NSEvents waiting in the
+ *      TKApplication event queue, generating X events from them.
  *
  * Results:
  *	None.
  *
  * Side effects:
- *	Moves applicable queued TkAqua events onto the Tcl event queue.
+ *	NSevents are used to generate X events, which are added to the
+ *      Tcl event queue.
  *
  *----------------------------------------------------------------------
  */
-
 static void
 TkMacOSXEventsCheckProc(
     ClientData clientData,
@@ -256,31 +250,23 @@ TkMacOSXEventsCheckProc(
     if (flags & TCL_WINDOW_EVENTS &&
 	    ![[NSRunLoop currentRunLoop] currentMode]) {
 	NSEvent *currentEvent = nil;
-	NSAutoreleasePool *pool = nil;
 	NSModalSession modalSession;
 
-	TSD_INIT();
-	if (tsdPtr->currentEvent) {
-	    currentEvent = tsdPtr->currentEvent;
-	    [currentEvent autorelease];
-	}
 	do {
 	    modalSession = TkMacOSXGetModalSession();
+	    currentEvent = [NSApp nextEventMatchingMask:NSAnyEventMask
+					      untilDate:[NSDate distantPast]
+						 inMode:GetRunLoopMode(modalSession)
+						dequeue:YES];
 	    if (!currentEvent) {
-		currentEvent = [NSApp nextEventMatchingMask:NSAnyEventMask
-			untilDate:[NSDate distantPast]
-			inMode:GetRunLoopMode(modalSession) dequeue:YES];
+		break; /* No more events. */
 	    }
-	    if (!currentEvent) {
-		break;
-	    }
-	    [currentEvent retain];
-	    pool = [NSAutoreleasePool new];
-	    if (![NSApp tkProcessEvent:currentEvent]) {
-		[currentEvent release];
-		currentEvent = nil;
-	    }
-	    if (currentEvent) {
+	    NSAutoreleasePool *pool = [NSAutoreleasePool new];
+	    /* Generate Xevents. */
+	    int oldServiceMode = Tcl_SetServiceMode(TCL_SERVICE_ALL);
+	    NSEvent *processedEvent = [NSApp tkProcessEvent:currentEvent];
+	    Tcl_SetServiceMode(oldServiceMode);
+	    if (processedEvent) { /* Should always be non-NULL. */
 #ifdef TK_MAC_DEBUG_EVENTS
 		TKLog(@"   event: %@", currentEvent);
 #endif
@@ -289,14 +275,12 @@ TkMacOSXEventsCheckProc(
 		} else {
 		    [NSApp sendEvent:currentEvent];
 		}
-		[currentEvent release];
-		currentEvent = nil;
 	    }
 	    [pool drain];
-	    pool = nil;
 	} while (1);
     }
 }
+
 
 /*
  * Local Variables: