cache disk icons

Mini vMac.xcodeproj/project.pbxproj

@@ -879,6 +879,7 @@
 				28F6B4961CF07DDD002D76D0 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
 		};
 		28F6B4AE1CF07EC9002D76D0 /* Build configuration list for PBXNativeTarget "libmfs" */ = {
 			isa = XCConfigurationList;
@@ -887,6 +888,7 @@
 				28F6B4B01CF07EC9002D76D0 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
 		};
 		28F6B4BC1CF07F32002D76D0 /* Build configuration list for PBXNativeTarget "libres" */ = {
 			isa = XCConfigurationList;
@@ -895,6 +897,7 @@
 				28F6B4BE1CF07F32002D76D0 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
 	};

Mini vMac/UIImage+DiskImageIcon.h

@@ -11,5 +11,6 @@
 @interface UIImage (DiskImageIcon)
 
 + (UIImage *)imageWithIconForDiskImage:(NSString *)path;
++ (NSCache<NSString*,UIImage*> *)diskImageIconCache;
 
 @end

Mini vMac/UIImage+DiskImageIcon.m

@@ -10,6 +10,7 @@
 #import "libhfs.h"
 #import "res.h"
 #import "mfs.h"
+#import "AppDelegate.h"
 
 #define kDiskImageHasDC42Header 1 << 0
 #define RSHORT(base, offset) ntohs(*((short *)((base) + (offset))))
@@ -22,10 +23,37 @@
 
 @end
 
+static NSCache<NSString*,UIImage*> *diskImageIconCache = nil;
+
 @implementation UIImage (DiskImageIcon)
 
++ (NSCache<NSString*,UIImage*> *)diskImageIconCache {
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        diskImageIconCache = [NSCache new];
+        diskImageIconCache.name = @"net.namedfork.minivmac.icon-cache";
+        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_didEjectDisk:) name:MNVMDidEjectDiskNotification object:nil];
+    });
+    return diskImageIconCache;
+}
+
++ (void)_didEjectDisk:(NSNotification*)notification {
+    NSString *path = [notification.userInfo[@"path"] stringByStandardizingPath];
+    // reload icon
+    [diskImageIconCache removeObjectForKey:path];
+    [self imageWithIconForDiskImage:path];
+}
+
 + (UIImage *)imageWithIconForDiskImage:(NSString *)path {
-    return [[DiskImageIconReader new] iconForDiskImage:path];
+    path = path.stringByStandardizingPath;
+    UIImage *icon = [[self diskImageIconCache] objectForKey:path];
+    if (icon == nil) {
+        icon = [[DiskImageIconReader new] iconForDiskImage:path];
+        if (icon != nil) {
+            [diskImageIconCache setObject:icon forKey:path];
+        }
+    }
+    return icon;
 }
 
 @end