allow changing emulated machine without relaunching the app

Mini vMac/AppDelegate.h

@@ -21,9 +21,11 @@ extern NSString *DocumentsChangedNotification;
 @property (nonatomic, readonly) NSArray<NSBundle*> *emulatorBundles;
 @property (nonatomic, readonly) NSString *emulatorBundlesPath;
 @property (readonly, nonatomic, getter = isSandboxed) BOOL sandboxed;
+@property (readonly, nonatomic) id<Emulator> sharedEmulator;
 
 + (instancetype)sharedInstance;
 + (id<Emulator>)sharedEmulator;
+- (void)reloadEmulator;
 
 - (void)showAlertWithTitle:(NSString *)title message:(NSString *)message;
 - (IBAction)showInsertDisk:(id)sender;

Mini vMac/AppDelegate.m

@@ -108,6 +108,24 @@ NSString *DocumentsChangedNotification = @"documentsChanged";
     return sharedEmulator != nil;
 }
 
+- (void)reloadEmulator {
+    NSBundle *bundle = sharedEmulator.bundle;
+    [self willChangeValueForKey:@"sharedEmulator"];
+    id<Emulator> oldEmulator = sharedEmulator;
+    sharedEmulator = nil;
+    [oldEmulator shutdown];
+    [bundle unload];
+    if (![self loadEmulator:[[NSUserDefaults standardUserDefaults] stringForKey:@"machine"]]) {
+        [self loadEmulator:@"MacPlus4M"];
+    }
+    [self didChangeValueForKey:@"sharedEmulator"];
+    [sharedEmulator performSelector:@selector(run) withObject:nil afterDelay:0.1];
+}
+
+- (id<Emulator>)sharedEmulator {
+    return sharedEmulator;
+}
+
 - (void)applicationDidEnterBackground:(UIApplication *)application {
     NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
     [defaults synchronize];

Mini vMac/EmulatorProtocol.h

@@ -38,11 +38,10 @@ typedef enum : NSInteger {
 @property (nonatomic, readonly) BOOL anyDiskInserted;
 @property (nonatomic, readonly) NSString *currentApplication;
 
-+ (instancetype)sharedEmulator;
-
 - (void)run;
 - (void)reset;
 - (void)interrupt;
+- (void)shutdown;
 
 - (void)keyDown:(int)scancode;
 - (void)keyUp:(int)scancode;

Mini vMac/MYOSGLUE.m

@@ -36,14 +36,14 @@ EXPORTVAR(ui3p, RAM)
 EXPORTVAR(ui3p, VidROM)
 EXPORTVAR(ui3p, VidMem)
 
-@interface Emulator : NSObject <Emulator, UIAlertViewDelegate>
+@interface MNVMBundleClassName : NSObject <Emulator, UIAlertViewDelegate>
 
 - (void)makeNewDisk:(NSString*)name size:(NSInteger)size;
 - (void)updateScreen:(CGImageRef)screenImage;
 
 @end
 
-static Emulator *sharedEmulator = nil;
+static __weak MNVMBundleClassName *sharedEmulator = nil;
 
 #pragma mark - some simple utilities
 
@@ -405,7 +405,7 @@ LOCALFUNC tMacErr vSonyEject0(tDrive Drive_No, blnr deleteit) {
     }
 #endif
     
-    [[NSNotificationCenter defaultCenter] postNotificationName:[Emulator sharedEmulator].ejectDiskNotification object:[Emulator sharedEmulator] userInfo:userInfo];
+    [[NSNotificationCenter defaultCenter] postNotificationName:sharedEmulator.ejectDiskNotification object:sharedEmulator userInfo:userInfo];
 
     return mnvm_noErr;
 }
@@ -455,7 +455,7 @@ LOCALFUNC blnr Sony_Insert0(FILE *refnum, blnr locked, NSString *filePath) {
     } else {
         NSDictionary *userInfo = @{@"path": filePath,
                                    @"drive": @(Drive_No)};
-        [[NSNotificationCenter defaultCenter] postNotificationName:[Emulator sharedEmulator].insertDiskNotification object:[Emulator sharedEmulator] userInfo:userInfo];
+        [[NSNotificationCenter defaultCenter] postNotificationName:sharedEmulator.insertDiskNotification object:sharedEmulator userInfo:userInfo];
         
 /* printf("Sony_Insert0 %d\n", (int)Drive_No); */
 
@@ -787,7 +787,7 @@ LOCALPROC HaveChangedScreenBuff(ui4r top, ui4r left, ui4r bottom, ui4r right) {
     
     if (colorSpace) {
         CGImageRef screenImage = CGImageCreate(vMacScreenWidth, vMacScreenHeight, bitsPerComponent, bitsPerPixel, bytesPerRow, colorSpace, options, screenDataProvider, NULL, false, kCGRenderingIntentDefault);
-        [[Emulator sharedEmulator] updateScreen:screenImage];
+        [sharedEmulator updateScreen:screenImage];
         CGImageRelease(screenImage);
     }
 }
@@ -1644,31 +1644,24 @@ GLOBALPROC WaitForNextTick(void) {
 
 #pragma mark - Objective-C Interface
 
-static dispatch_once_t onceToken;
-
-@implementation Emulator
+@implementation MNVMBundleClassName
 {
     __block __weak UITextField *nameTextField;
 }
 
 @synthesize dataPath;
 
-+ (instancetype)sharedEmulator {
-    dispatch_once(&onceToken, ^{
-        sharedEmulator = [self new];
-    });
-    return sharedEmulator;
-}
-
 - (instancetype)init {
     if ((self = [super init])) {
-        dispatch_once(&onceToken, ^{
-            sharedEmulator = self;
-        });
+        sharedEmulator = self;
     }
     return self;
 }
 
+- (void)shutdown {
+    RequestMacOff = trueblnr;
+}
+
 - (void)run {
     ZapOSGLUVars();
     if (InitOSGLU()) {

Mini vMac/Mac128K/CNFUDALL.h

@@ -39,6 +39,8 @@
 #define AutoLocation 1
 #define AutoTimeZone 1
 
+#define MNVMBundleClassName Mac128KEmulator
+
 #ifdef PLIST_PREPROCESSOR
 #define MNVMBundleDisplayName Mac 128K
 #define MNVMBundleGetInfoString 128K, 512×342

Mini vMac/MacII-640x480/CNFUDALL.h

@@ -39,6 +39,8 @@
 #define AutoLocation 1
 #define AutoTimeZone 1
 
+#define MNVMBundleClassName MacIIEmulator640x480
+
 #ifdef PLIST_PREPROCESSOR
 #define MNVMBundleDisplayName Mac II
 #define MNVMBundleGetInfoString 8M, 640×480

Mini vMac/MacII/CNFUDALL.h

@@ -39,6 +39,8 @@
 #define AutoLocation 1
 #define AutoTimeZone 1
 
+#define MNVMBundleClassName MacIIEmulator
+
 #ifdef PLIST_PREPROCESSOR
 #define MNVMBundleDisplayName Mac II
 #define MNVMBundleGetInfoString 8M, 1024×768

Mini vMac/MacPlus4M/CNFUDALL.h

@@ -40,6 +40,8 @@
 #define AutoLocation 1
 #define AutoTimeZone 1
 
+#define MNVMBundleClassName MacPlus4MEmulator
+
 #ifdef PLIST_PREPROCESSOR
 #define MNVMBundleDisplayName Mac Plus
 #define MNVMBundleGetInfoString 4M, 512×342

Mini vMac/PlugIn-Info.plist

@@ -25,6 +25,6 @@
 	<key>CFBundleVersion</key>
 	<string>$(CURRENT_PROJECT_VERSION)</string>
 	<key>NSPrincipalClass</key>
-	<string>Emulator</string>
+	<string>MNVMBundleClassName</string>
 </dict>
 </plist>

Mini vMac/ScreenView.m

@@ -26,13 +26,9 @@ static ScreenView *sharedScreenView = nil;
     NSString *screenFilter = [[NSUserDefaults standardUserDefaults] stringForKey:@"screenFilter"];
     videoLayer.magnificationFilter = screenFilter;
     videoLayer.minificationFilter = screenFilter;
-    [AppDelegate sharedEmulator].screenLayer = videoLayer;
-    if ([AppDelegate sharedEmulator]) {
-        screenSize = [AppDelegate sharedEmulator].screenSize;
-    } else {
-        screenSize = CGSizeMake(1, 1);
-    }
+    [self updateVideoLayer];
     [self.layer addSublayer:videoLayer];
+    [[AppDelegate sharedInstance] addObserver:self forKeyPath:@"sharedEmulator" options:NSKeyValueObservingOptionNew context:NULL];
     [[NSUserDefaults standardUserDefaults] addObserver:self forKeyPath:@"screenFilter" options:NSKeyValueObservingOptionNew context:NULL];
 }
 
@@ -48,6 +44,15 @@ static ScreenView *sharedScreenView = nil;
     return screenSize;
 }
 
+- (void)updateVideoLayer {
+    if ([AppDelegate sharedEmulator]) {
+        [AppDelegate sharedEmulator].screenLayer = videoLayer;
+        screenSize = [AppDelegate sharedEmulator].screenSize;
+    } else {
+        screenSize = CGSizeMake(1, 1);
+    }
+}
+
 - (void)layoutSubviews {
     [super layoutSubviews];
     CGRect viewBounds = self.bounds;
@@ -73,10 +78,14 @@ static ScreenView *sharedScreenView = nil;
             videoLayer.magnificationFilter = value;
             videoLayer.minificationFilter = value;
         }
+    } else if (object == [AppDelegate sharedInstance] && [keyPath isEqualToString:@"sharedEmulator"]) {
+        [self updateVideoLayer];
+        [self layoutSubviews];
     }
 }
 
 - (void)dealloc {
     [[NSUserDefaults standardUserDefaults] removeObserver:self forKeyPath:@"screenFilter" context:NULL];
 }
+
 @end

Mini vMac/SettingsViewController.m

@@ -108,6 +108,9 @@ typedef enum : NSInteger {
 - (void)viewWillDisappear:(BOOL)animated {
     [super viewWillDisappear:animated];
     [AppDelegate sharedEmulator].running = YES;
+    if (![selectedEmulatorBundle isEqual:[AppDelegate sharedEmulator].bundle] && ![AppDelegate sharedEmulator].anyDiskInserted) {
+        [[AppDelegate sharedInstance] reloadEmulator];
+    }
 }
 
 - (void)showInsertDisk:(id)sender {
@@ -209,8 +212,8 @@ typedef enum : NSInteger {
 - (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section {
     if (section == SettingsSectionSpeed) {
         return NSLocalizedString(@"Faster speeds and running in background drain the battery faster", nil);
-    } else if (section == SettingsSectionMachine) {
-        return NSLocalizedString(@"Changing the emulated machine requires to relaunch Mini vMac", nil);
+    } else if (section == SettingsSectionMachine && [AppDelegate sharedEmulator].anyDiskInserted) {
+        return NSLocalizedString(@"The emulated machine cannot be changed while disks are inserted.", nil);
     } else {
         return nil;
     }
@@ -328,6 +331,13 @@ typedef enum : NSInteger {
     return cell;
 }
 
+- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath {
+    if (indexPath.section == SettingsSectionMachine && [AppDelegate sharedEmulator].anyDiskInserted) {
+        return nil;
+    }
+    return indexPath;
+}
+
 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
     NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
     [tableView deselectRowAtIndexPath:indexPath animated:YES];

Mini vMac/ViewController.m

@@ -208,19 +208,21 @@ API_AVAILABLE(ios(13.4))
 }
 
 - (void)emulatorDidShutDown:(NSNotification*)notification {
-    UILabel *shutdownLabel = [[UILabel alloc] initWithFrame:self.view.bounds];
-    shutdownLabel.text = NSLocalizedString(@"the emulated Mac has shut down\ntap to restart", nil);
-    shutdownLabel.textColor = [UIColor whiteColor];
-    [self.view addSubview:shutdownLabel];
-    shutdownLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
-    [shutdownLabel addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(restartEmulator:)]];
-    shutdownLabel.numberOfLines = -1;
-    shutdownLabel.textAlignment = NSTextAlignmentCenter;
-    shutdownLabel.userInteractionEnabled = YES;
-    [UIView animateWithDuration:0.5 animations:^{
-        self.screenView.alpha = 0.5;
-    }];
-    [self hideKeyboard:notification];
+    if (notification.object == [AppDelegate sharedEmulator]) {
+        UILabel *shutdownLabel = [[UILabel alloc] initWithFrame:self.view.bounds];
+        shutdownLabel.text = NSLocalizedString(@"the emulated Mac has shut down\ntap to restart", nil);
+        shutdownLabel.textColor = [UIColor whiteColor];
+        [self.view addSubview:shutdownLabel];
+        shutdownLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+        [shutdownLabel addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(restartEmulator:)]];
+        shutdownLabel.numberOfLines = -1;
+        shutdownLabel.textAlignment = NSTextAlignmentCenter;
+        shutdownLabel.userInteractionEnabled = YES;
+        [UIView animateWithDuration:0.5 animations:^{
+            self.screenView.alpha = 0.5;
+        }];
+        [self hideKeyboard:notification];
+    }
 }
 
 - (void)restartEmulator:(UITapGestureRecognizer*)gestureRecognizer {