Added PasteboardController to handle pasteboard cleanup on shutdown and timeout

MacPass/MPPasteBoardController.m

@@ -0,0 +1,87 @@
+//
+//  MPPastBoardController.m
+//  MacPass
+//
+//  Created by Michael Starke on 02.03.13.
+//  Copyright (c) 2013 HicknHack Software GmbH. All rights reserved.
+//
+
+#import "MPPasteBoardController.h"
+
+@interface MPPasteBoardController ()
+
+@property (assign) BOOL isEmpty;
+
+- (void)_clearPasteboardContents;
+- (void)_updateNotifications;
+
+@end
+
+@implementation MPPasteBoardController
+
++ (MPPasteBoardController *)defaultController {
+  static MPPasteBoardController* sharedInstance;
+  static dispatch_once_t onceToken;
+  dispatch_once(&onceToken, ^{
+    sharedInstance = [[MPPasteBoardController alloc] init];
+  });
+  return sharedInstance;
+}
+
+- (id)init {
+  self = [super init];
+  if (self) {
+    _isEmpty = YES;
+    /* User preferences and bindings */
+    _clearTimeout = 30;
+    _clearPasteboardOnShutdown = YES;
+    [self _updateNotifications];
+  }
+  return self;
+}
+
+- (void)dealloc
+{
+  if(_clearPasteboardOnShutdown) {
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
+  }
+  [super dealloc];
+}
+
+- (void)_updateNotifications {
+  if(self.clearPasteboardOnShutdown) {
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(clearContents) name:NSApplicationWillTerminateNotification object:nil];
+  }
+  else {
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
+  }
+}
+
+- (void)setClearTimeout:(NSTimeInterval)clearTimeout {
+  if(_clearTimeout != clearTimeout) {
+    _clearTimeout = clearTimeout;
+  }
+}
+
+- (void)setClearPasteboardOnShutdown:(BOOL)clearPasteboardOnShutdown {
+  if(_clearPasteboardOnShutdown != clearPasteboardOnShutdown ) {
+    _clearPasteboardOnShutdown = !_clearPasteboardOnShutdown;
+    [self _updateNotifications];
+  }
+}
+
+- (void)copyObjects:(NSArray *)objects {
+  [[NSPasteboard generalPasteboard] clearContents];
+  [[NSPasteboard generalPasteboard] writeObjects:objects];
+  self.isEmpty = NO;
+  [self performSelector:@selector(clearContents) withObject:nil afterDelay:self.clearTimeout];
+}
+
+- (void)_clearPasteboardContents {
+  /* Only clear stuff we might have put there */
+  if(!self.isEmpty) {
+    [[NSPasteboard generalPasteboard] clearContents];
+  }
+  self.isEmpty = YES;
+}
+@end