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 @implementation DecoderViewController
  36
  37 @synthesize cameraBarItem;
  38 @synthesize libraryBarItem;
  39 @synthesize savedPhotosBarItem;
  40 @synthesize archiveBarItem;
  41 @synthesize actionBarItem;
  42
  43 @synthesize messageView;
  44 @synthesize messageTextView;
  45 @synthesize messageHelpButton;
  46 @synthesize imageView;
  47 @synthesize toolbar;
  48
  49 @synthesize decoder;
  50 @synthesize result;
  51 @synthesize actions;
  52
  53 @synthesize resultPointViews;
  54
  55 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
  56         if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
  57                 // Initialization code
  58     self.title = NSLocalizedString(@"DecoderViewController AppTitle", @"Barcode Scanner");
  59
  60     Decoder *d = [[Decoder alloc] init];
  61     self.decoder = d;
  62     d.delegate = self;
  63     [d release];
  64     resultPointViews = [[NSMutableArray alloc] init];
  65         }
  66         return self;
  67 }
  68
  69 - (void) messageReady:(id)sender {
  70   MessageViewController *messageController = sender;
  71   [[self navigationController] pushViewController:messageController animated:true];
  72   [messageController release];
  73 }
  74
  75 - (void) messageFailed:(id)sender {
  76   MessageViewController *messageController = sender;
  77   NSLog(@"Failed to load message!");
  78   [messageController release];
  79 }
  80
  81 - (void) showHints:(id)sender {
  82   NSLog(@"Showing Hints!");
  83
  84   MessageViewController *hintsController =
  85   [[MessageViewController alloc] initWithMessageFilename:@"Hints"
  86                                                   target:self
  87                                                onSuccess:@selector(messageReady:)
  88                                                onFailure:@selector(messageFailed:)];
  89   hintsController.title = NSLocalizedString(@"DecoderViewController Hints MessageViewController title", @"Hints");
  90   hintsController.view;
  91 }
  92
  93 - (void) showAbout:(id)sender {
  94   NSLog(@"Showing About!");
  95
  96   MessageViewController *aboutController =
  97   [[MessageViewController alloc] initWithMessageFilename:@"About"
  98                                                   target:self
  99                                                onSuccess:@selector(messageReady:)
 100                                                onFailure:@selector(messageFailed:)];
 101   aboutController.title = NSLocalizedString(@"DecoderViewController About MessageViewController title", @"About");
 102   aboutController.view;
 103 }
 104
 105
 106 #define HELP_BUTTON_WIDTH (44.0)
 107 #define HELP_BUTTON_HEIGHT (55.0)
 108
 109
 110 #define FONT_NAME @"TimesNewRomanPSMT"
 111 #define FONT_SIZE 16.0
 112
 113 - (void) reset {
 114   self.result = nil;
 115   [self clearImageView];
 116   [self updateToolbar];
 117   [self showMessage:NSLocalizedString(@"DecoderViewController take or choose picture", @"Please take or choose a picture containing a barcode") helpButton:YES];
 118 }
 119
 120 // Implement loadView if you want to create a view hierarchy programmatically
 121 - (void)loadView {
 122   [super loadView];
 123
 124   CGRect messageViewFrame = imageView.frame;
 125   UIView *mView = [[UIView alloc] initWithFrame:messageViewFrame];
 126   mView.backgroundColor = [UIColor darkGrayColor];
 127   mView.alpha = 0.9;
 128   mView.autoresizingMask = UIViewAutoresizingFlexibleHeight |
 129   UIViewAutoresizingFlexibleWidth |
 130   UIViewAutoresizingFlexibleTopMargin;
 131
 132   UITextView *mTextView = [[UITextView alloc] initWithFrame:messageViewFrame];
 133   mTextView.autoresizingMask = UIViewAutoresizingFlexibleHeight |
 134   UIViewAutoresizingFlexibleWidth;
 135   mTextView.editable = false;
 136   mTextView.scrollEnabled = true;
 137   mTextView.font = [UIFont fontWithName:FONT_NAME size:FONT_SIZE];
 138   mTextView.textColor = [UIColor whiteColor];
 139   mTextView.backgroundColor = [[UIColor lightGrayColor] colorWithAlphaComponent:0.0];
 140   mTextView.textAlignment = UITextAlignmentLeft;
 141   mTextView.alpha = 1.0;
 142   [mView addSubview:mTextView];
 143
 144   UIButton *mHelpButton = [[UIButton buttonWithType:UIButtonTypeInfoLight] retain];
 145   mHelpButton.frame = CGRectMake(messageViewFrame.size.width - HELP_BUTTON_WIDTH, 0.0, HELP_BUTTON_WIDTH, HELP_BUTTON_HEIGHT);
 146
 147   mHelpButton.backgroundColor = [UIColor clearColor];
 148   [mHelpButton setUserInteractionEnabled:YES];
 149   [mHelpButton addTarget:self action:@selector(showHints:) forControlEvents:UIControlEventTouchUpInside];
 150
 151   self.messageHelpButton = mHelpButton;
 152   [mHelpButton release];
 153
 154   self.messageTextView = mTextView;
 155   [mTextView release];
 156
 157   self.messageView = mView;
 158   [mView release];
 159
 160   [self.view addSubview:self.messageView];
 161
 162   // add the 'About' button at the top-right of the navigation bar
 163   UIBarButtonItem *aboutButton =
 164   [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"DecoderViewController about button title", @"About")
 165                                    style:UIBarButtonItemStyleBordered
 166                                   target:self
 167                                   action:@selector(showAbout:)];
 168   self.navigationItem.rightBarButtonItem = aboutButton;
 169   [aboutButton release];
 170
 171   [self reset];
 172 }
 173
 174 - (void) updateToolbar {
 175   self.cameraBarItem.enabled = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
 176   self.savedPhotosBarItem.enabled = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum];
 177   self.libraryBarItem.enabled = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary];
 178   self.archiveBarItem.enabled = true;
 179   self.actionBarItem.enabled = (self.result != nil) && ([self.result actions] != nil) && ([self.result actions].count > 0);
 180 }
 181
 182
 183 // If you need to do additional setup after loading the view, override viewDidLoad.
 184 - (void)viewDidLoad {
 185   [super viewDidLoad];
 186 }
 187
 188
 189 - (void)clearImageView {
 190   imageView.image = nil;
 191   for (UIView *view in resultPointViews) {
 192     [view removeFromSuperview];
 193   }
 194   [resultPointViews removeAllObjects];
 195 }
 196
 197 - (void)pickAndDecodeFromSource:(UIImagePickerControllerSourceType) sourceType {
 198   [self reset];
 199   \
 200   // Create the Image Picker
 201   if ([UIImagePickerController isSourceTypeAvailable:sourceType]) {
 202     UIImagePickerController* picker = [[UIImagePickerController alloc] init];
 203     picker.sourceType = sourceType;
 204     picker.delegate = self;
 205     picker.allowsImageEditing = YES; // [[NSUserDefaults standardUserDefaults] boolForKey:@"allowEditing"];
 206
 207     // Picker is displayed asynchronously.
 208     [self presentModalViewController:picker animated:YES];
 209   } else {
 210     NSLog(@"Attempted to pick an image with illegal source type '%d'", sourceType);
 211   }
 212 }
 213
 214 - (IBAction)pickAndDecode:(id) sender {
 215   UIImagePickerControllerSourceType sourceType;
 216   int i = [sender tag];
 217
 218   switch (i) {
 219     case 0: sourceType = UIImagePickerControllerSourceTypeCamera; break;
 220     case 1: sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; break;
 221     case 2: sourceType = UIImagePickerControllerSourceTypePhotoLibrary; break;
 222     default: sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
 223   }
 224   [self pickAndDecodeFromSource:sourceType];
 225 }
 226
 227
 228 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
 229         // Return YES for supported orientations
 230         return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
 231 }
 232
 233
 234 - (void)didReceiveMemoryWarning {
 235         [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
 236         // Release anything that's not essential, such as cached data
 237 }
 238
 239 - (void)dealloc {
 240   [decoder release];
 241   [self clearImageView];
 242   [imageView release];
 243   [actionBarItem release];
 244   [cameraBarItem release];
 245   [libraryBarItem release];
 246   [savedPhotosBarItem release];
 247   [archiveBarItem release];
 248   [toolbar release];
 249   [actions dealloc];
 250   [resultPointViews dealloc];
 251
 252         [super dealloc];
 253 }
 254
 255 - (void)showMessage:(NSString *)message helpButton:(BOOL)showHelpButton {
 256 #ifdef DEBUG
 257   NSLog(@"Showing message '%@' %@ help Button", message, showHelpButton ? @"with" : @"without");
 258 #endif
 259
 260   CGSize maxSize = imageView.bounds.size;
 261   if (showHelpButton) {
 262     maxSize.width -= messageHelpButton.frame.size.width;
 263   }
 264   CGSize size = [message sizeWithFont:messageTextView.font constrainedToSize:maxSize lineBreakMode:UILineBreakModeWordWrap];
 265   float height = 20.0 + fmin(100.0, size.height);
 266   if (showHelpButton) {
 267     height = fmax(HELP_BUTTON_HEIGHT, height);
 268   }
 269
 270   CGRect messageFrame = imageView.bounds;
 271   messageFrame.origin.y = CGRectGetMaxY(messageFrame) - height;
 272   messageFrame.size.height = height;
 273   [self.messageView setFrame:messageFrame];
 274   messageView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth;
 275   CGRect messageViewBounds = [messageView bounds];
 276
 277   self.messageTextView.text = message;
 278   messageTextView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
 279   if (showHelpButton) {
 280     CGRect textViewFrame;
 281     CGRect helpButtonFrame;
 282
 283     CGRectDivide(messageViewBounds, &helpButtonFrame, &textViewFrame, HELP_BUTTON_WIDTH, CGRectMaxXEdge);
 284     [self.messageTextView setFrame:textViewFrame];
 285
 286     [messageHelpButton setFrame:helpButtonFrame];
 287     messageHelpButton.alpha = 1.0;
 288     messageHelpButton.enabled = YES;
 289     messageHelpButton.autoresizingMask =
 290       UIViewAutoresizingFlexibleLeftMargin |
 291       UIViewAutoresizingFlexibleTopMargin;
 292     [messageView addSubview:messageHelpButton];
 293   } else {
 294     [messageHelpButton removeFromSuperview];
 295     messageHelpButton.alpha = 0.0;
 296     messageHelpButton.enabled = NO;
 297
 298     [self.messageTextView setFrame:messageViewBounds];
 299   }
 300 }
 301
 302 // DecoderDelegate methods
 303
 304 - (void)decoder:(Decoder *)decoder willDecodeImage:(UIImage *)image {
 305   [self clearImageView];
 306   [self.imageView setImage:image];
 307   [self showMessage:[NSString stringWithFormat:NSLocalizedString(@"DecoderViewController MessageWhileDecodingWithDimensions", @"Decoding image (%.0fx%.0f) ..."), image.size.width, image.size.height]
 308      helpButton:NO];
 309 }
 310
 311 - (void)decoder:(Decoder *)decoder
 312   decodingImage:(UIImage *)image
 313     usingSubset:(UIImage *)subset
 314        progress:(NSString *)message {
 315   [self clearImageView];
 316   [self.imageView setImage:subset];
 317   [self showMessage:message helpButton:NO];
 318 }
 319
 320 - (void)presentResultForString:(NSString *)resultString {
 321   self.result = [ResultParser parsedResultForString:resultString];
 322   [self showMessage:[self.result stringForDisplay] helpButton:NO];
 323   self.actions = self.result.actions;
 324 #ifdef DEBUG
 325   NSLog(@"result has %d actions", actions ? 0 : actions.count);
 326 #endif
 327   [self updateToolbar];
 328 }
 329
 330 - (void)presentResultPoints:(NSArray *)resultPoints
 331                    forImage:(UIImage *)image
 332                 usingSubset:(UIImage *)subset {
 333   // simply add the points to the image view
 334   imageView.image = subset;
 335   for (NSValue *pointValue in resultPoints) {
 336     [imageView addResultPoint:[pointValue CGPointValue]];
 337   }
 338 }
 339
 340 - (void)decoder:(Decoder *)decoder didDecodeImage:(UIImage *)image usingSubset:(UIImage *)subset withResult:(TwoDDecoderResult *)twoDResult {
 341   [self presentResultForString:twoDResult.text];
 342
 343   [self presentResultPoints:twoDResult.points forImage:image usingSubset:subset];
 344
 345   // save the scan to the shared database
 346   [[Database sharedDatabase] addScanWithText:twoDResult.text];
 347
 348   [self performResultAction:self];
 349 }
 350
 351 - (void)decoder:(Decoder *)decoder failedToDecodeImage:(UIImage *)image usingSubset:(UIImage *)subset reason:(NSString *)reason {
 352   [self showMessage:reason helpButton:YES];
 353   [self updateToolbar];
 354 }
 355
 356
 357 - (void)willAnimateFirstHalfOfRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
 358   [super willAnimateFirstHalfOfRotationToInterfaceOrientation:toInterfaceOrientation duration:duration];
 359
 360   if (imageView.image) {
 361     /*
 362     CGRect viewBounds = imageView.bounds;
 363     CGSize imageSize = imageView.image.size;
 364     float scale = fmin(viewBounds.size.width / imageSize.width,
 365                        viewBounds.size.height / imageSize.height);
 366     float xOffset = (viewBounds.size.width - scale * imageSize.width) / 2.0;
 367     float yOffset = (viewBounds.size.height - scale * imageSize.height) / 2.0;
 368      */
 369
 370     for (UIView *view in resultPointViews) {
 371       view.alpha = 0.0;
 372     }
 373   }
 374 }
 375
 376 - (void)willAnimateSecondHalfOfRotationFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation duration:(NSTimeInterval)duration {
 377   [super willAnimateSecondHalfOfRotationFromInterfaceOrientation:fromInterfaceOrientation duration:duration];
 378
 379   if (imageView.image) {
 380     /*
 381     CGRect viewBounds = imageView.bounds;
 382     CGSize imageSize = imageView.image.size;
 383     float scale = fmin(viewBounds.size.width / imageSize.width,
 384                        viewBounds.size.height / imageSize.height);
 385     float xOffset = (viewBounds.size.width - scale * imageSize.width) / 2.0;
 386     float yOffset = (viewBounds.size.height - scale * imageSize.height) / 2.0;
 387      */
 388
 389     for (UIView *view in resultPointViews) {
 390       view.alpha = 1.0;
 391     }
 392   }
 393 }
 394
 395 // UIImagePickerControllerDelegate methods
 396
 397 - (void)imagePickerController:(UIImagePickerController *)picker
 398         didFinishPickingImage:(UIImage *)image
 399                   editingInfo:(NSDictionary *)editingInfo
 400 {
 401   UIImage *imageToDecode = image;
 402 #ifdef DEBUG
 403   NSLog(@"picked image size = (%f, %f)", image.size.width, image.size.height);
 404 #endif
 405   if (editingInfo) {
 406     UIImage *originalImage = [editingInfo objectForKey:UIImagePickerControllerOriginalImage];
 407     if (originalImage) {
 408 #ifdef DEBUG
 409       NSLog(@"original image size = (%f, %f)", originalImage.size.width, originalImage.size.height);
 410 #endif
 411       NSValue *cropRectValue = [editingInfo objectForKey:UIImagePickerControllerCropRect];
 412       if (cropRectValue) {
 413         CGRect cropRect = [cropRectValue CGRectValue];
 414 #ifdef DEBUG
 415         NSLog(@"crop rect = (%f, %f) x (%f, %f)", CGRectGetMinX(cropRect), CGRectGetMinY(cropRect), CGRectGetWidth(cropRect), CGRectGetHeight(cropRect));
 416 #endif
 417         UIGraphicsBeginImageContext(cropRect.size);
 418
 419         [originalImage drawAtPoint:CGPointMake(-CGRectGetMinX(cropRect),
 420                                                -CGRectGetMinY(cropRect))];
 421
 422         imageToDecode = UIGraphicsGetImageFromCurrentImageContext();
 423         UIGraphicsEndImageContext();
 424       }
 425     }
 426   }
 427
 428   [[picker parentViewController] dismissModalViewControllerAnimated:YES];
 429   [imageToDecode retain];
 430   [picker release];
 431   [self.decoder decodeImage:imageToDecode];
 432   [imageToDecode release];
 433   [self updateToolbar];
 434 }
 435
 436 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
 437 {
 438   [picker dismissModalViewControllerAnimated:YES];
 439   [picker release];
 440   [self updateToolbar];
 441 }
 442
 443 - (void)navigationController:(UINavigationController *)navigationController
 444        didShowViewController:(UIViewController *)viewController
 445                     animated:(BOOL)animated {
 446   // no-op
 447 }
 448
 449 - (void)navigationController:(UINavigationController *)navigationController
 450       willShowViewController:(UIViewController *)viewController
 451                     animated:(BOOL)animated {
 452   // no-op
 453 }
 454
 455 - (void)performAction:(ResultAction *)action {
 456   [action performActionWithController:self shouldConfirm:NO];
 457 }
 458
 459 - (void)confirmAndPerformAction:(ResultAction *)action {
 460   [action performActionWithController:self shouldConfirm:YES];
 461 }
 462
 463
 464 - (IBAction)performResultAction:(id)sender {
 465   if (self.result == nil) {
 466     NSLog(@"no result to perform an action on!");
 467     return;
 468   }
 469
 470   if (self.actions == nil || self.actions.count == 0) {
 471     NSLog(@"result has no actions to perform!");
 472     return;
 473   }
 474
 475   if (self.actions.count == 1) {
 476     ResultAction *action = [self.actions lastObject];
 477 #ifdef DEBUG
 478     NSLog(@"Result has the single action, (%@)  '%@', performing it",
 479           NSStringFromClass([action class]), [action title]);
 480 #endif
 481     [self performSelector:@selector(confirmAndPerformAction:)
 482                  withObject:action
 483                  afterDelay:0.0];
 484   } else {
 485 #ifdef DEBUG
 486     NSLog(@"Result has multiple actions, popping up an action sheet");
 487 #endif
 488     UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithFrame:self.view.bounds];
 489
 490     for (ResultAction *action in self.actions) {
 491       [actionSheet addButtonWithTitle:[action title]];
 492     }
 493
 494     int cancelIndex = [actionSheet addButtonWithTitle:NSLocalizedString(@"DecoderViewController cancel button title", @"Cancel")];
 495     actionSheet.cancelButtonIndex = cancelIndex;
 496
 497     actionSheet.delegate = self;
 498
 499     [actionSheet showFromToolbar:self.toolbar];
 500   }
 501 }
 502
 503 - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
 504   if (buttonIndex < self.actions.count) {
 505     int actionIndex = buttonIndex;
 506     ResultAction *action = [self.actions objectAtIndex:actionIndex];
 507     [self performSelector:@selector(performAction:)
 508                  withObject:action
 509                  afterDelay:0.0];
 510   }
 511 }
 512
 513 - (IBAction)showArchive:(id)sender {
 514   ArchiveController *archiveController = [[ArchiveController alloc] initWithDecoderViewController:self];
 515   [[self navigationController] pushViewController:archiveController animated:true];
 516   [archiveController release];
 517 }
 518
 519 - (void)showScan:(Scan *)scan {
 520   [self clearImageView];
 521   [self presentResultForString:scan.text];
 522   [[self navigationController] popToViewController:self animated:YES];
 523 }
 524
 525 @end