iphone/Classes/DecoderViewController.m

   1 //
   2 //  DecoderViewController.m
   3 //  ZXing
   4 //
   5 //  Created by Christian Brunschen on 22/05/2008.
   6 /*
   7  * Copyright 2008 ZXing authors
   8  *
   9  * Licensed under the Apache License, Version 2.0 (the "License");
  10  * you may not use this file except in compliance with the License.
  11  * You may obtain a copy of the License at
  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  * Unless required by applicable law or agreed to in writing, software
  16  * distributed under the License is distributed on an "AS IS" BASIS,
  17  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18  * See the License for the specific language governing permissions and
  19  * limitations under the License.
  20  */
  21
  22 #import "DecoderViewController.h"
  23 #import "Decoder.h"
  24 #import "NSString+HTML.h"
  25 #import "ResultParser.h"
  26 #import "ParsedResult.h"
  27 #import "ResultAction.h"
  28
  29 #import "Database.h"
  30 #import "ArchiveController.h"
  31 #import "MessageViewController.h"
  32 #import "Scan.h"
  33 #import "TwoDDecoderResult.h"
  34
  35 // Michael Jurewitz, Dec 16, 2009 6:32 PM writes:
  36 // https://devforums.apple.com/message/149553
  37 // Notice Regarding UIGetScreenImage()
  38 // After carefully considering the issue, Apple is now allowing applications to
  39 // use the function UIGetScreenImage() to programmatically capture the current
  40 // screen contents.
  41 // Note that a future release of iPhone OS may provide a public API equivalent
  42 // of this functionality.  At such time, all applications using
  43 // UIGetScreenImage() will be required to adopt the public API.
  44 CGImageRef MyCGImageCopyScreenContents(void) {
  45    extern CGImageRef UIGetScreenImage(void);
  46    return UIGetScreenImage(); /* already retained */
  47 }
  48
  49 @interface DecoderViewController()
  50 - (void)takeScreenshot;
  51 @end
  52
  53 @implementation DecoderViewController
  54
  55 @synthesize cameraBarItem;
  56 @synthesize libraryBarItem;
  57 @synthesize savedPhotosBarItem;
  58 @synthesize archiveBarItem;
  59 @synthesize actionBarItem;
  60
  61 @synthesize messageView;
  62 @synthesize messageTextView;
  63 @synthesize messageHelpButton;
  64 @synthesize imageView;
  65 @synthesize picker;
  66 @synthesize toolbar;
  67
  68 @synthesize decoder;
  69 @synthesize result;
  70 @synthesize actions;
  71
  72 @synthesize resultPointViews;
  73
  74 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
  75   if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {
  76     // Initialization code
  77     self.title =
  78         NSLocalizedString(@"DecoderViewController AppTitle", @"Barcode Scanner");
  79
  80     Decoder *d = [[Decoder alloc] init];
  81     self.decoder = d;
  82     d.delegate = self;
  83     [d release];
  84     resultPointViews = [[NSMutableArray alloc] init];
  85   }
  86   return self;
  87 }
  88
  89 - (void) messageReady:(id)sender {
  90   MessageViewController *messageController = sender;
  91   [[self navigationController] pushViewController:messageController animated:true];
  92   [messageController release];
  93 }
  94
  95 - (void) messageFailed:(id)sender {
  96   MessageViewController *messageController = sender;
  97   NSLog(@"Failed to load message!");
  98   [messageController release];
  99 }
 100
 101 - (void) showHints:(id)sender {
 102   NSLog(@"Showing Hints!");
 103
 104   MessageViewController *hintsController =
 105       [[MessageViewController alloc] initWithMessageFilename:@"Hints"
 106                                                       target:self
 107                                                    onSuccess:@selector(messageReady:)
 108                                                    onFailure:@selector(messageFailed:)];
 109   hintsController.title =
 110       NSLocalizedString(@"DecoderViewController Hints MessageViewController title", @"Hints");
 111   [hintsController view];
 112 }
 113
 114 - (void) showAbout:(id)sender {
 115   NSLog(@"Showing About!");
 116
 117   MessageViewController *aboutController =
 118       [[MessageViewController alloc] initWithMessageFilename:@"About"
 119                                                       target:self
 120                                                    onSuccess:@selector(messageReady:)
 121                                                    onFailure:@selector(messageFailed:)];
 122   aboutController.title =
 123       NSLocalizedString(@"DecoderViewController About MessageViewController title", @"About");
 124   [aboutController view];
 125 }
 126
 127
 128 #define HELP_BUTTON_WIDTH (44.0)
 129 #define HELP_BUTTON_HEIGHT (55.0)
 130
 131
 132 #define FONT_NAME @"TimesNewRomanPSMT"
 133 #define FONT_SIZE 16.0
 134
 135 - (void) reset {
 136   self.result = nil;
 137   [self clearImageView];
 138   [self updateToolbar];
 139   [self showMessage:NSLocalizedString(@"DecoderViewController take or choose picture",
 140       @"Please take or choose a picture containing a barcode") helpButton:YES];
 141 }
 142
 143 // Implement loadView if you want to create a view hierarchy programmatically
 144 - (void)loadView {
 145   [super loadView];
 146
 147   CGRect messageViewFrame = imageView.frame;
 148   UIView *mView = [[UIView alloc] initWithFrame:messageViewFrame];
 149   mView.backgroundColor = [UIColor darkGrayColor];
 150   mView.alpha = 0.9;
 151   mView.autoresizingMask = UIViewAutoresizingFlexibleHeight |
 152   UIViewAutoresizingFlexibleWidth |
 153   UIViewAutoresizingFlexibleTopMargin;
 154
 155   UITextView *mTextView = [[UITextView alloc] initWithFrame:messageViewFrame];
 156   mTextView.autoresizingMask = UIViewAutoresizingFlexibleHeight |
 157   UIViewAutoresizingFlexibleWidth;
 158   mTextView.editable = false;
 159   mTextView.scrollEnabled = true;
 160   mTextView.font = [UIFont fontWithName:FONT_NAME size:FONT_SIZE];
 161   mTextView.textColor = [UIColor whiteColor];
 162   mTextView.backgroundColor = [[UIColor lightGrayColor] colorWithAlphaComponent:0.0];
 163   mTextView.textAlignment = UITextAlignmentLeft;
 164   mTextView.alpha = 1.0;
 165   [mView addSubview:mTextView];
 166
 167   UIButton *mHelpButton = [[UIButton buttonWithType:UIButtonTypeInfoLight] retain];
 168   mHelpButton.frame = CGRectMake(messageViewFrame.size.width - HELP_BUTTON_WIDTH, 0.0, HELP_BUTTON_WIDTH, HELP_BUTTON_HEIGHT);
 169
 170   mHelpButton.backgroundColor = [UIColor clearColor];
 171   [mHelpButton setUserInteractionEnabled:YES];
 172   [mHelpButton addTarget:self action:@selector(showHints:) forControlEvents:UIControlEventTouchUpInside];
 173
 174   self.messageHelpButton = mHelpButton;
 175   [mHelpButton release];
 176
 177   self.messageTextView = mTextView;
 178   [mTextView release];
 179
 180   self.messageView = mView;
 181   [mView release];
 182
 183   [self.view addSubview:self.messageView];
 184
 185   // add the 'About' button at the top-right of the navigation bar
 186   UIBarButtonItem *aboutButton =
 187   [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"DecoderViewController about button title", @"About")
 188                                    style:UIBarButtonItemStyleBordered
 189                                   target:self
 190                                   action:@selector(showAbout:)];
 191   self.navigationItem.rightBarButtonItem = aboutButton;
 192   [aboutButton release];
 193
 194   [self reset];
 195 }
 196
 197 - (void) updateToolbar {
 198   self.cameraBarItem.enabled = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
 199   self.savedPhotosBarItem.enabled = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum];
 200   self.libraryBarItem.enabled = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary];
 201   self.archiveBarItem.enabled = true;
 202   self.actionBarItem.enabled = (self.result != nil) && ([self.result actions] != nil) && ([self.result actions].count > 0);
 203 }
 204
 205
 206 // If you need to do additional setup after loading the view, override viewDidLoad.
 207 - (void)viewDidLoad {
 208   [super viewDidLoad];
 209 }
 210
 211
 212 - (void)clearImageView {
 213   imageView.image = nil;
 214   for (UIView *view in resultPointViews) {
 215     [view removeFromSuperview];
 216   }
 217   [resultPointViews removeAllObjects];
 218 }
 219
 220 - (void)pickAndDecodeFromSource:(UIImagePickerControllerSourceType) sourceType {
 221   [self reset];
 222
 223   // Create the Image Picker
 224   if ([UIImagePickerController isSourceTypeAvailable:sourceType]) {
 225     UIImagePickerController* aPicker =
 226         [[[UIImagePickerController alloc] init] autorelease];
 227     aPicker.sourceType = sourceType;
 228     aPicker.delegate = self;
 229     self.picker = aPicker;
 230
 231     // [[NSUserDefaults standardUserDefaults] boolForKey:@"allowEditing"];
 232     BOOL isCamera = (sourceType == UIImagePickerControllerSourceTypeCamera);
 233     if ([picker respondsToSelector:@selector(setAllowsEditing:)]) {
 234       // not in 3.0
 235       [picker setAllowsEditing:!isCamera];
 236     }
 237     if (isCamera) {
 238       if ([picker respondsToSelector:@selector(setShowsCameraControls:)]) {
 239         [picker setShowsCameraControls:NO];
 240         UIButton *cancelButton =
 241           [UIButton buttonWithType:UIButtonTypeRoundedRect];
 242         NSString *cancelString =
 243           NSLocalizedString(@"DecoderViewController cancel button title", @"");
 244         CGFloat height = [UIFont systemFontSize];
 245         CGSize size =
 246           [cancelString sizeWithFont:[UIFont systemFontOfSize:height]];
 247         [cancelButton setTitle:cancelString forState:UIControlStateNormal];
 248         CGRect appFrame = [[UIScreen mainScreen] bounds];
 249         static const int kMargin = 10;
 250         static const int kInternalXMargin = 10;
 251         static const int kInternalYMargin = 10;
 252         CGRect frame = CGRectMake(kMargin,
 253           appFrame.size.height - (height + 2*kInternalYMargin + kMargin),
 254           2*kInternalXMargin + size.width,
 255           height + 2*kInternalYMargin);
 256         [cancelButton setFrame:frame];
 257         [cancelButton addTarget:self
 258                          action:@selector(cancel:)
 259                forControlEvents:UIControlEventTouchUpInside];
 260         picker.cameraOverlayView = cancelButton;
 261         // The camera takes quite a while to start up. Hence the 2 second delay.
 262         [self performSelector:@selector(takeScreenshot)
 263                    withObject:nil
 264                    afterDelay:2.0];
 265       }
 266     }
 267
 268     // Picker is displayed asynchronously.
 269     [self presentModalViewController:picker animated:YES];
 270   } else {
 271     NSLog(@"Attempted to pick an image with illegal source type '%d'", sourceType);
 272   }
 273 }
 274
 275 - (IBAction)pickAndDecode:(id) sender {
 276   UIImagePickerControllerSourceType sourceType;
 277   int i = [sender tag];
 278
 279   switch (i) {
 280     case 0: sourceType = UIImagePickerControllerSourceTypeCamera; break;
 281     case 1: sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; break;
 282     case 2: sourceType = UIImagePickerControllerSourceTypePhotoLibrary; break;
 283     default: sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
 284   }
 285   [self pickAndDecodeFromSource:sourceType];
 286 }
 287
 288
 289 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
 290   // Return YES for supported orientations
 291   return (interfaceOrientation == UIInterfaceOrientationPortrait);
 292 }
 293
 294
 295 - (void)didReceiveMemoryWarning {
 296   [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
 297   // Release anything that's not essential, such as cached data
 298 }
 299
 300 - (void)dealloc {
 301   [decoder release];
 302   [self clearImageView];
 303   [imageView release];
 304   [actionBarItem release];
 305   [cameraBarItem release];
 306   [libraryBarItem release];
 307   [savedPhotosBarItem release];
 308   [archiveBarItem release];
 309   [toolbar release];
 310   [picker release];
 311   [actions release];
 312   [resultPointViews release];
 313
 314   [super dealloc];
 315 }
 316
 317 - (void)showMessage:(NSString *)message helpButton:(BOOL)showHelpButton {
 318 #ifdef DEBUG
 319   NSLog(@"Showing message '%@' %@ help Button", message, showHelpButton ? @"with" : @"without");
 320 #endif
 321
 322   CGSize imageMaxSize = imageView.bounds.size;
 323   if (showHelpButton) {
 324     imageMaxSize.width -= messageHelpButton.frame.size.width;
 325   }
 326   CGSize size = [message sizeWithFont:messageTextView.font constrainedToSize:imageMaxSize lineBreakMode:UILineBreakModeWordWrap];
 327   float height = 20.0 + fmin(100.0, size.height);
 328   if (showHelpButton) {
 329     height = fmax(HELP_BUTTON_HEIGHT, height);
 330   }
 331
 332   CGRect messageFrame = imageView.bounds;
 333   messageFrame.origin.y = CGRectGetMaxY(messageFrame) - height;
 334   messageFrame.size.height = height;
 335   [self.messageView setFrame:messageFrame];
 336   messageView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth;
 337   CGRect messageViewBounds = [messageView bounds];
 338
 339   self.messageTextView.text = message;
 340   messageTextView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
 341   if (showHelpButton) {
 342     CGRect textViewFrame;
 343     CGRect helpButtonFrame;
 344
 345     CGRectDivide(messageViewBounds, &helpButtonFrame, &textViewFrame, HELP_BUTTON_WIDTH, CGRectMaxXEdge);
 346     [self.messageTextView setFrame:textViewFrame];
 347
 348     [messageHelpButton setFrame:helpButtonFrame];
 349     messageHelpButton.alpha = 1.0;
 350     messageHelpButton.enabled = YES;
 351     messageHelpButton.autoresizingMask =
 352       UIViewAutoresizingFlexibleLeftMargin |
 353       UIViewAutoresizingFlexibleTopMargin;
 354     [messageView addSubview:messageHelpButton];
 355   } else {
 356     [messageHelpButton removeFromSuperview];
 357     messageHelpButton.alpha = 0.0;
 358     messageHelpButton.enabled = NO;
 359
 360     [self.messageTextView setFrame:messageViewBounds];
 361   }
 362 }
 363
 364 // DecoderDelegate methods
 365
 366 - (void)decoder:(Decoder *)decoder willDecodeImage:(UIImage *)image usingSubset:(UIImage *)subset{
 367   [self clearImageView];
 368   [self.imageView setImage:subset];
 369   [self showMessage:[NSString stringWithFormat:NSLocalizedString(@"DecoderViewController MessageWhileDecodingWithDimensions", @"Decoding image (%.0fx%.0f) ..."), image.size.width, image.size.height]
 370      helpButton:NO];
 371 }
 372
 373 - (void)decoder:(Decoder *)decoder
 374   decodingImage:(UIImage *)image
 375     usingSubset:(UIImage *)subset
 376        progress:(NSString *)message {
 377   [self clearImageView];
 378   [self.imageView setImage:subset];
 379   [self showMessage:message helpButton:NO];
 380 }
 381
 382 - (void)presentResultForString:(NSString *)resultString {
 383   self.result = [ResultParser parsedResultForString:resultString];
 384   [self showMessage:[self.result stringForDisplay] helpButton:NO];
 385   self.actions = self.result.actions;
 386 #ifdef DEBUG
 387   NSLog(@"result has %d actions", actions ? 0 : actions.count);
 388 #endif
 389   [self updateToolbar];
 390 }
 391
 392 - (void)presentResultPoints:(NSArray *)resultPoints
 393                    forImage:(UIImage *)image
 394                 usingSubset:(UIImage *)subset {
 395   // simply add the points to the image view
 396   imageView.image = subset;
 397   for (NSValue *pointValue in resultPoints) {
 398     [imageView addResultPoint:[pointValue CGPointValue]];
 399   }
 400 }
 401
 402 - (void)decoder:(Decoder *)decoder didDecodeImage:(UIImage *)image usingSubset:(UIImage *)subset withResult:(TwoDDecoderResult *)twoDResult {
 403   self.picker = nil;
 404   [self presentResultForString:twoDResult.text];
 405
 406   [self presentResultPoints:twoDResult.points forImage:image usingSubset:subset];
 407
 408   // save the scan to the shared database
 409   [[Database sharedDatabase] addScanWithText:twoDResult.text];
 410
 411   [self performResultAction:self];
 412 }
 413
 414 - (void)decoder:(Decoder *)decoder failedToDecodeImage:(UIImage *)image usingSubset:(UIImage *)subset reason:(NSString *)reason {
 415   if (self.picker && UIImagePickerControllerSourceTypeCamera == self.picker.sourceType) {
 416     // If we are using the camera, and the user hasn't manually cancelled,
 417     // take another snapshot and try to decode it.
 418     [self takeScreenshot];
 419   } else {
 420     [self showMessage:reason helpButton:YES];
 421     [self updateToolbar];
 422   }
 423 }
 424
 425
 426 - (void)willAnimateFirstHalfOfRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
 427   [super willAnimateFirstHalfOfRotationToInterfaceOrientation:toInterfaceOrientation duration:duration];
 428
 429   if (imageView.image) {
 430     /*
 431     CGRect viewBounds = imageView.bounds;
 432     CGSize imageSize = imageView.image.size;
 433     float scale = fmin(viewBounds.size.width / imageSize.width,
 434                        viewBounds.size.height / imageSize.height);
 435     float xOffset = (viewBounds.size.width - scale * imageSize.width) / 2.0;
 436     float yOffset = (viewBounds.size.height - scale * imageSize.height) / 2.0;
 437      */
 438
 439     for (UIView *view in resultPointViews) {
 440       view.alpha = 0.0;
 441     }
 442   }
 443 }
 444
 445 - (void)willAnimateSecondHalfOfRotationFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation duration:(NSTimeInterval)duration {
 446   [super willAnimateSecondHalfOfRotationFromInterfaceOrientation:fromInterfaceOrientation duration:duration];
 447
 448   if (imageView.image) {
 449     /*
 450     CGRect viewBounds = imageView.bounds;
 451     CGSize imageSize = imageView.image.size;
 452     float scale = fmin(viewBounds.size.width / imageSize.width,
 453                        viewBounds.size.height / imageSize.height);
 454     float xOffset = (viewBounds.size.width - scale * imageSize.width) / 2.0;
 455     float yOffset = (viewBounds.size.height - scale * imageSize.height) / 2.0;
 456      */
 457
 458     for (UIView *view in resultPointViews) {
 459       view.alpha = 1.0;
 460     }
 461   }
 462 }
 463
 464 - (void)cancel:(id)sender {
 465   self.picker = nil;
 466 }
 467
 468 - (void)takeScreenshot {
 469   if (picker) {
 470     CGImageRef cgScreen = MyCGImageCopyScreenContents();
 471     if (cgScreen) {
 472       CGRect croppedFrame = CGRectMake(0, 0, CGImageGetWidth(cgScreen),
 473           CGImageGetHeight(cgScreen) - (10+toolbar.bounds.size.height));
 474       CGImageRef cgCropped = CGImageCreateWithImageInRect(cgScreen, croppedFrame);
 475       if (cgCropped) {
 476         UIImage *screenshot = [UIImage imageWithCGImage:cgCropped];
 477         CGImageRelease(cgCropped);
 478         [self.decoder decodeImage:screenshot];
 479       }
 480       CGImageRelease(cgScreen);
 481     }
 482   }
 483 }
 484
 485 // UIImagePickerControllerDelegate methods
 486
 487 - (void)imagePickerController:(UIImagePickerController *)aPicker
 488 didFinishPickingMediaWithInfo:(NSDictionary *)info {
 489   UIImage *imageToDecode =
 490     [info objectForKey:UIImagePickerControllerEditedImage];
 491   if (!imageToDecode) {
 492     imageToDecode = [info objectForKey:UIImagePickerControllerOriginalImage];
 493   }
 494   CGSize size = [imageToDecode size];
 495   CGRect cropRect = CGRectMake(0.0, 0.0, size.width, size.height);
 496
 497 #ifdef DEBUG
 498   NSLog(@"picked image size = (%f, %f)", size.width, size.height);
 499 #endif
 500   NSString *systemVersion = [[UIDevice currentDevice] systemVersion];
 501
 502   NSValue *cropRectValue = [info objectForKey:UIImagePickerControllerCropRect];
 503   if (cropRectValue) {
 504     UIImage *originalImage = [info objectForKey:UIImagePickerControllerOriginalImage];
 505     if (originalImage) {
 506 #ifdef DEBUG
 507       NSLog(@"original image size = (%f, %f)", originalImage.size.width, originalImage.size.height);
 508 #endif
 509        cropRect = [cropRectValue CGRectValue];
 510 #ifdef DEBUG
 511       NSLog(@"crop rect = (%f, %f) x (%f, %f)", CGRectGetMinX(cropRect), CGRectGetMinY(cropRect), CGRectGetWidth(cropRect), CGRectGetHeight(cropRect));
 512 #endif
 513       if (([picker sourceType] == UIImagePickerControllerSourceTypeSavedPhotosAlbum) &&
 514           [@"2.1" isEqualToString:systemVersion]) {
 515         // adjust crop rect to work around bug in iPhone OS 2.1 when selecting from the photo roll
 516         cropRect.origin.x *= 2.5;
 517         cropRect.origin.y *= 2.5;
 518         cropRect.size.width *= 2.5;
 519         cropRect.size.height *= 2.5;
 520 #ifdef DEBUG
 521         NSLog(@"2.1-adjusted crop rect = (%f, %f) x (%f, %f)", CGRectGetMinX(cropRect), CGRectGetMinY(cropRect), CGRectGetWidth(cropRect), CGRectGetHeight(cropRect));
 522 #endif
 523       }
 524
 525       imageToDecode = originalImage;
 526     }
 527   }
 528
 529   [imageToDecode retain];
 530   self.picker = nil;
 531   [self.decoder decodeImage:imageToDecode cropRect:cropRect];
 532   [imageToDecode release];
 533 }
 534
 535
 536 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)aPicker {
 537   self.picker = nil;
 538 }
 539
 540 - (void)setPicker:(UIImagePickerController *)aPicker {
 541   if (picker != aPicker) {
 542     [picker dismissModalViewControllerAnimated:YES];
 543     picker = [aPicker retain];
 544     [self updateToolbar];
 545   }
 546 }
 547
 548 - (void)navigationController:(UINavigationController *)navigationController
 549        didShowViewController:(UIViewController *)viewController
 550                     animated:(BOOL)animated {
 551   // no-op
 552 }
 553
 554 - (void)navigationController:(UINavigationController *)navigationController
 555       willShowViewController:(UIViewController *)viewController
 556                     animated:(BOOL)animated {
 557   // no-op
 558 }
 559
 560 - (void)performAction:(ResultAction *)action {
 561   [action performActionWithController:self shouldConfirm:NO];
 562 }
 563
 564 - (void)confirmAndPerformAction:(ResultAction *)action {
 565   [action performActionWithController:self shouldConfirm:YES];
 566 }
 567
 568
 569 - (IBAction)performResultAction:(id)sender {
 570   if (self.result == nil) {
 571     NSLog(@"no result to perform an action on!");
 572     return;
 573   }
 574
 575   if (self.actions == nil || self.actions.count == 0) {
 576     NSLog(@"result has no actions to perform!");
 577     return;
 578   }
 579
 580   if (self.actions.count == 1) {
 581     ResultAction *action = [self.actions lastObject];
 582 #ifdef DEBUG
 583     NSLog(@"Result has the single action, (%@)  '%@', performing it",
 584           NSStringFromClass([action class]), [action title]);
 585 #endif
 586     [self performSelector:@selector(confirmAndPerformAction:)
 587                  withObject:action
 588                  afterDelay:0.0];
 589   } else {
 590 #ifdef DEBUG
 591     NSLog(@"Result has multiple actions, popping up an action sheet");
 592 #endif
 593     UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithFrame:self.view.bounds];
 594
 595     for (ResultAction *action in self.actions) {
 596       [actionSheet addButtonWithTitle:[action title]];
 597     }
 598
 599     int cancelIndex = [actionSheet addButtonWithTitle:NSLocalizedString(@"DecoderViewController cancel button title", @"Cancel")];
 600     actionSheet.cancelButtonIndex = cancelIndex;
 601
 602     actionSheet.delegate = self;
 603
 604     [actionSheet showFromToolbar:self.toolbar];
 605   }
 606 }
 607
 608 - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
 609   if (buttonIndex < self.actions.count) {
 610     int actionIndex = buttonIndex;
 611     ResultAction *action = [self.actions objectAtIndex:actionIndex];
 612     [self performSelector:@selector(performAction:)
 613                  withObject:action
 614                  afterDelay:0.0];
 615   }
 616 }
 617
 618 - (IBAction)showArchive:(id)sender {
 619   ArchiveController *archiveController = [[ArchiveController alloc] initWithDecoderViewController:self];
 620   [[self navigationController] pushViewController:archiveController animated:true];
 621   [archiveController release];
 622 }
 623
 624 - (void)showScan:(Scan *)scan {
 625   [self clearImageView];
 626   [self presentResultForString:scan.text];
 627   [[self navigationController] popToViewController:self animated:YES];
 628 }
 629
 630 @end