[Visualization] Tear down window vis when not open

When the visualization window is not open, it should not continue to run
the scene until the app is quit. Apparently, the windowed mode is really
slow on old Intel machines, too. Full screening it is enough to bodge
the entire system session until the machine is remotely rebooted.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>

SpectrumWindowController.h

@@ -11,7 +11,7 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
-@interface SpectrumWindowController : NSWindowController {
+@interface SpectrumWindowController : NSWindowController <NSWindowDelegate> {
 	IBOutlet PlaybackController *playbackController;
 }
 

SpectrumWindowController.m

@@ -22,15 +22,33 @@
 - (void)windowDidLoad {
 	[super windowDidLoad];
 
-	self.spectrumView = [[SpectrumView alloc] initWithFrame:[[self window] frame]];
-	[[self window] setContentView:self.spectrumView];
+	[self startRunning];
+}
 
-	[self.spectrumView enableCameraControl];
+- (void)startRunning {
+	if(!self.spectrumView) {
+		self.spectrumView = [[SpectrumView alloc] initWithFrame:[[self window] frame]];
+		[[self window] setContentView:self.spectrumView];
+
+		[self.spectrumView enableCameraControl];
+	}
 
 	if(playbackController.playbackStatus == CogStatusPlaying)
 		[self.spectrumView startPlayback];
 }
 
+- (void)stopRunning {
+	[[self window] setContentView:nil];
+	self.spectrumView = nil;
+}
+
+- (void)windowWillClose:(NSNotification *)notification {
+	NSWindow *currentWindow = notification.object;
+	if([currentWindow isEqualTo:self.window]) {
+		[self stopRunning];
+	}
+}
+
 - (IBAction)toggleWindow:(id)sender {
 	if([[self window] isVisible])
 		[[self window] orderOut:self];
@@ -39,8 +57,7 @@
 }
 
 - (IBAction)showWindow:(id)sender {
-	if(self.spectrumView && playbackController.playbackStatus == CogStatusPlaying)
-		[self.spectrumView startPlayback];
+	[self startRunning];
 	return [super showWindow:sender];
 }