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