zxing/iphone/Classes/DecoderViewController.m

//
//  DecoderViewController.m
//  ZXing
//
//  Created by Christian Brunschen on 22/05/2008.
/*
 * Copyright 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#import "DecoderViewController.h"
#import "Decoder.h"
#import "NSString+HTML.h"
#import "ResultParser.h"
#import "ParsedResult.h"
#import "ResultAction.h"

#import "Database.h"
#import "ArchiveController.h"
#import "MessageViewController.h"
#import "Scan.h"
#import "TwoDDecoderResult.h"

@implementation DecoderViewController

@synthesize cameraBarItem;
@synthesize libraryBarItem;
@synthesize savedPhotosBarItem;
@synthesize archiveBarItem;
@synthesize actionBarItem;

@synthesize messageView;
@synthesize messageTextView;
@synthesize messageHelpButton;
@synthesize imageView;
@synthesize toolbar;

@synthesize decoder;
@synthesize result;
@synthesize actions;

@synthesize resultPointViews;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
	if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
		// Initialization code
    self.title = NSLocalizedString(@"DecoderViewController AppTitle", @"Barcode Scanner");
    
    Decoder *d = [[Decoder alloc] init];
    self.decoder = d;
    d.delegate = self;
    [d release];
    resultPointViews = [[NSMutableArray alloc] init];
	}
	return self;
}

- (void) messageReady:(id)sender {
  MessageViewController *messageController = sender;
  [[self navigationController] pushViewController:messageController animated:true];
  [messageController release];
}

- (void) messageFailed:(id)sender {
  MessageViewController *messageController = sender;
  NSLog(@"Failed to load message!");
  [messageController release];
}

- (void) showHints:(id)sender {
  NSLog(@"Showing Hints!");
  
  MessageViewController *hintsController = 
  [[MessageViewController alloc] initWithMessageFilename:@"Hints"
                                                  target:self 
                                               onSuccess:@selector(messageReady:) 
                                               onFailure:@selector(messageFailed:)];
  hintsController.title = NSLocalizedString(@"DecoderViewController Hints MessageViewController title", @"Hints");
  hintsController.view;
}

- (void) showAbout:(id)sender {
  NSLog(@"Showing About!");
  
  MessageViewController *aboutController = 
  [[MessageViewController alloc] initWithMessageFilename:@"About"
                                                  target:self 
                                               onSuccess:@selector(messageReady:) 
                                               onFailure:@selector(messageFailed:)];
  aboutController.title = NSLocalizedString(@"DecoderViewController About MessageViewController title", @"About");
  aboutController.view;
}

  
#define HELP_BUTTON_WIDTH (44.0)
#define HELP_BUTTON_HEIGHT (55.0)


#define FONT_NAME @"TimesNewRomanPSMT"
#define FONT_SIZE 16.0

- (void) reset {
  self.result = nil;
  [self clearImageView];
  [self updateToolbar];
  [self showMessage:NSLocalizedString(@"DecoderViewController take or choose picture", @"Please take or choose a picture containing a barcode") helpButton:YES];
}

// Implement loadView if you want to create a view hierarchy programmatically
- (void)loadView {
  [super loadView];
  
  CGRect messageViewFrame = imageView.frame;
  UIView *mView = [[UIView alloc] initWithFrame:messageViewFrame];
  mView.backgroundColor = [UIColor darkGrayColor];
  mView.alpha = 0.9;
  mView.autoresizingMask = UIViewAutoresizingFlexibleHeight | 
  UIViewAutoresizingFlexibleWidth |
  UIViewAutoresizingFlexibleTopMargin;
  
  UITextView *mTextView = [[UITextView alloc] initWithFrame:messageViewFrame];
  mTextView.autoresizingMask = UIViewAutoresizingFlexibleHeight | 
  UIViewAutoresizingFlexibleWidth;
  mTextView.editable = false;
  mTextView.scrollEnabled = true;
  mTextView.font = [UIFont fontWithName:FONT_NAME size:FONT_SIZE];
  mTextView.textColor = [UIColor whiteColor];
  mTextView.backgroundColor = [[UIColor lightGrayColor] colorWithAlphaComponent:0.0];
  mTextView.textAlignment = UITextAlignmentLeft;
  mTextView.alpha = 1.0;
  [mView addSubview:mTextView];

  UIButton *mHelpButton = [[UIButton buttonWithType:UIButtonTypeInfoLight] retain];
  mHelpButton.frame = CGRectMake(messageViewFrame.size.width - HELP_BUTTON_WIDTH, 0.0, HELP_BUTTON_WIDTH, HELP_BUTTON_HEIGHT);
  
  mHelpButton.backgroundColor = [UIColor clearColor];
  [mHelpButton setUserInteractionEnabled:YES];
  [mHelpButton addTarget:self action:@selector(showHints:) forControlEvents:UIControlEventTouchUpInside];

  self.messageHelpButton = mHelpButton;
  [mHelpButton release];
  
  self.messageTextView = mTextView;
  [mTextView release];
  
  self.messageView = mView;
  [mView release];
  
  [self.view addSubview:self.messageView];
  
  // add the 'About' button at the top-right of the navigation bar
  UIBarButtonItem *aboutButton = 
  [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"DecoderViewController about button title", @"About") 
                                   style:UIBarButtonItemStyleBordered
                                  target:self 
                                  action:@selector(showAbout:)];
  self.navigationItem.rightBarButtonItem = aboutButton;
  [aboutButton release];
  
  [self reset];
}

- (void) updateToolbar {
  self.cameraBarItem.enabled = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
  self.savedPhotosBarItem.enabled = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum];
  self.libraryBarItem.enabled = [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary];
  self.archiveBarItem.enabled = true;
  self.actionBarItem.enabled = (self.result != nil) && ([self.result actions] != nil) && ([self.result actions].count > 0);
}


// If you need to do additional setup after loading the view, override viewDidLoad.
- (void)viewDidLoad {
  [super viewDidLoad];
}


- (void)clearImageView {
  imageView.image = nil;
  for (UIView *view in resultPointViews) {
    [view removeFromSuperview];
  }
  [resultPointViews removeAllObjects];
}

- (void)pickAndDecodeFromSource:(UIImagePickerControllerSourceType) sourceType {
  [self reset];
  \
  // Create the Image Picker
  if ([UIImagePickerController isSourceTypeAvailable:sourceType]) {
    UIImagePickerController* picker = [[UIImagePickerController alloc] init];
    picker.sourceType = sourceType;
    picker.delegate = self;
    picker.allowsImageEditing = YES; // [[NSUserDefaults standardUserDefaults] boolForKey:@"allowEditing"];
    
    // Picker is displayed asynchronously.
    [self presentModalViewController:picker animated:YES];
  } else {
    NSLog(@"Attempted to pick an image with illegal source type '%d'", sourceType);
  }
}

- (IBAction)pickAndDecode:(id) sender {
  UIImagePickerControllerSourceType sourceType;
  int i = [sender tag];
  
  switch (i) {
    case 0: sourceType = UIImagePickerControllerSourceTypeCamera; break;
    case 1: sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; break;
    case 2: sourceType = UIImagePickerControllerSourceTypePhotoLibrary; break;
    default: sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
  }
  [self pickAndDecodeFromSource:sourceType];
}


- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
  // Return YES for supported orientations
  return (interfaceOrientation == UIInterfaceOrientationPortrait);
}


- (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
  // Release anything that's not essential, such as cached data
}

- (void)dealloc {
  [decoder release];
  [self clearImageView];
  [imageView release];
  [actionBarItem release];
  [cameraBarItem release];
  [libraryBarItem release];
  [savedPhotosBarItem release];
  [archiveBarItem release];
  [toolbar release];
  [actions dealloc];
  [resultPointViews dealloc];
  
	[super dealloc];
}

- (void)showMessage:(NSString *)message helpButton:(BOOL)showHelpButton {
#ifdef DEBUG
  NSLog(@"Showing message '%@' %@ help Button", message, showHelpButton ? @"with" : @"without");
#endif
  
  CGSize maxSize = imageView.bounds.size;
  if (showHelpButton) {
    maxSize.width -= messageHelpButton.frame.size.width;
  }
  CGSize size = [message sizeWithFont:messageTextView.font constrainedToSize:maxSize lineBreakMode:UILineBreakModeWordWrap];
  float height = 20.0 + fmin(100.0, size.height);
  if (showHelpButton) {
    height = fmax(HELP_BUTTON_HEIGHT, height);
  }

  CGRect messageFrame = imageView.bounds;
  messageFrame.origin.y = CGRectGetMaxY(messageFrame) - height;
  messageFrame.size.height = height;
  [self.messageView setFrame:messageFrame];
  messageView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth;
  CGRect messageViewBounds = [messageView bounds];

  self.messageTextView.text = message;
  messageTextView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
  if (showHelpButton) {
    CGRect textViewFrame;
    CGRect helpButtonFrame;
    
    CGRectDivide(messageViewBounds, &helpButtonFrame, &textViewFrame, HELP_BUTTON_WIDTH, CGRectMaxXEdge);
    [self.messageTextView setFrame:textViewFrame];
    
    [messageHelpButton setFrame:helpButtonFrame];
    messageHelpButton.alpha = 1.0;
    messageHelpButton.enabled = YES;
    messageHelpButton.autoresizingMask = 
      UIViewAutoresizingFlexibleLeftMargin | 
      UIViewAutoresizingFlexibleTopMargin;
    [messageView addSubview:messageHelpButton];
  } else {
    [messageHelpButton removeFromSuperview];
    messageHelpButton.alpha = 0.0;
    messageHelpButton.enabled = NO;

    [self.messageTextView setFrame:messageViewBounds];
  }
}

// DecoderDelegate methods

- (void)decoder:(Decoder *)decoder willDecodeImage:(UIImage *)image {
  [self clearImageView];
  [self.imageView setImage:image];
  [self showMessage:[NSString stringWithFormat:NSLocalizedString(@"DecoderViewController MessageWhileDecodingWithDimensions", @"Decoding image (%.0fx%.0f) ..."), image.size.width, image.size.height]
     helpButton:NO];
}

- (void)decoder:(Decoder *)decoder 
  decodingImage:(UIImage *)image 
    usingSubset:(UIImage *)subset
       progress:(NSString *)message {
  [self clearImageView];
  [self.imageView setImage:subset];
  [self showMessage:message helpButton:NO];
}

- (void)presentResultForString:(NSString *)resultString {
  self.result = [ResultParser parsedResultForString:resultString];
  [self showMessage:[self.result stringForDisplay] helpButton:NO];
  self.actions = self.result.actions;
#ifdef DEBUG
  NSLog(@"result has %d actions", actions ? 0 : actions.count);
#endif
  [self updateToolbar];
} 

- (void)presentResultPoints:(NSArray *)resultPoints 
                   forImage:(UIImage *)image
                usingSubset:(UIImage *)subset {
  // simply add the points to the image view
  imageView.image = subset;
  for (NSValue *pointValue in resultPoints) {
    [imageView addResultPoint:[pointValue CGPointValue]];
  }
}

- (void)decoder:(Decoder *)decoder didDecodeImage:(UIImage *)image usingSubset:(UIImage *)subset withResult:(TwoDDecoderResult *)twoDResult {
  [self presentResultForString:twoDResult.text];
  
  [self presentResultPoints:twoDResult.points forImage:image usingSubset:subset];
  
  // save the scan to the shared database
  [[Database sharedDatabase] addScanWithText:twoDResult.text];
  
  [self performResultAction:self];
}

- (void)decoder:(Decoder *)decoder failedToDecodeImage:(UIImage *)image usingSubset:(UIImage *)subset reason:(NSString *)reason {
  [self showMessage:reason helpButton:YES];
  [self updateToolbar];
}


- (void)willAnimateFirstHalfOfRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
  [super willAnimateFirstHalfOfRotationToInterfaceOrientation:toInterfaceOrientation duration:duration];
  
  if (imageView.image) {
    /*
    CGRect viewBounds = imageView.bounds;
    CGSize imageSize = imageView.image.size;
    float scale = fmin(viewBounds.size.width / imageSize.width,
                       viewBounds.size.height / imageSize.height);
    float xOffset = (viewBounds.size.width - scale * imageSize.width) / 2.0;
    float yOffset = (viewBounds.size.height - scale * imageSize.height) / 2.0;
     */
    
    for (UIView *view in resultPointViews) {
      view.alpha = 0.0;
    }
  }  
}

- (void)willAnimateSecondHalfOfRotationFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation duration:(NSTimeInterval)duration {
  [super willAnimateSecondHalfOfRotationFromInterfaceOrientation:fromInterfaceOrientation duration:duration];

  if (imageView.image) {
    /*
    CGRect viewBounds = imageView.bounds;
    CGSize imageSize = imageView.image.size;
    float scale = fmin(viewBounds.size.width / imageSize.width,
                       viewBounds.size.height / imageSize.height);
    float xOffset = (viewBounds.size.width - scale * imageSize.width) / 2.0;
    float yOffset = (viewBounds.size.height - scale * imageSize.height) / 2.0;
     */
    
    for (UIView *view in resultPointViews) {
      view.alpha = 1.0;
    }
  }  
}

// UIImagePickerControllerDelegate methods

- (void)imagePickerController:(UIImagePickerController *)picker
        didFinishPickingImage:(UIImage *)image
                  editingInfo:(NSDictionary *)editingInfo
{
  UIImage *imageToDecode = image;
#ifdef DEBUG
  NSLog(@"picked image size = (%f, %f)", image.size.width, image.size.height);
#endif
  if (editingInfo) {
    UIImage *originalImage = [editingInfo objectForKey:UIImagePickerControllerOriginalImage];
    if (originalImage) {
#ifdef DEBUG
      NSLog(@"original image size = (%f, %f)", originalImage.size.width, originalImage.size.height);
#endif
      NSValue *cropRectValue = [editingInfo objectForKey:UIImagePickerControllerCropRect];
      if (cropRectValue) {
        CGRect cropRect = [cropRectValue CGRectValue];
#ifdef DEBUG
        NSLog(@"crop rect = (%f, %f) x (%f, %f)", CGRectGetMinX(cropRect), CGRectGetMinY(cropRect), CGRectGetWidth(cropRect), CGRectGetHeight(cropRect));
#endif
        UIGraphicsBeginImageContext(cropRect.size);
        
        [originalImage drawAtPoint:CGPointMake(-CGRectGetMinX(cropRect),
                                               -CGRectGetMinY(cropRect))];
        
        imageToDecode = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
      }
    }
  }
  
  [[picker parentViewController] dismissModalViewControllerAnimated:YES];
  [imageToDecode retain];
  [picker release];
  [self.decoder decodeImage:imageToDecode];
  [imageToDecode release];
  [self updateToolbar];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
  [picker dismissModalViewControllerAnimated:YES];
  [picker release];
  [self updateToolbar];
}

- (void)navigationController:(UINavigationController *)navigationController 
       didShowViewController:(UIViewController *)viewController 
                    animated:(BOOL)animated {
  // no-op
}

- (void)navigationController:(UINavigationController *)navigationController 
      willShowViewController:(UIViewController *)viewController 
                    animated:(BOOL)animated {
  // no-op
}

- (void)performAction:(ResultAction *)action {
  [action performActionWithController:self shouldConfirm:NO];
}

- (void)confirmAndPerformAction:(ResultAction *)action {
  [action performActionWithController:self shouldConfirm:YES];
}


- (IBAction)performResultAction:(id)sender {
  if (self.result == nil) {
    NSLog(@"no result to perform an action on!");
    return;
  }
  
  if (self.actions == nil || self.actions.count == 0) {
    NSLog(@"result has no actions to perform!");
    return;
  }
  
  if (self.actions.count == 1) {
    ResultAction *action = [self.actions lastObject];
#ifdef DEBUG
    NSLog(@"Result has the single action, (%@)  '%@', performing it",
          NSStringFromClass([action class]), [action title]);
#endif
    [self performSelector:@selector(confirmAndPerformAction:) 
                 withObject:action 
                 afterDelay:0.0];
  } else {
#ifdef DEBUG
    NSLog(@"Result has multiple actions, popping up an action sheet");
#endif
    UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithFrame:self.view.bounds];
        
    for (ResultAction *action in self.actions) {
      [actionSheet addButtonWithTitle:[action title]];
    }
    
    int cancelIndex = [actionSheet addButtonWithTitle:NSLocalizedString(@"DecoderViewController cancel button title", @"Cancel")];
    actionSheet.cancelButtonIndex = cancelIndex;
    
    actionSheet.delegate = self;
    
    [actionSheet showFromToolbar:self.toolbar];
  }
}

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
  if (buttonIndex < self.actions.count) {
    int actionIndex = buttonIndex;
    ResultAction *action = [self.actions objectAtIndex:actionIndex];
    [self performSelector:@selector(performAction:) 
                 withObject:action 
                 afterDelay:0.0];
  }
}

- (IBAction)showArchive:(id)sender {
  ArchiveController *archiveController = [[ArchiveController alloc] initWithDecoderViewController:self];
  [[self navigationController] pushViewController:archiveController animated:true];
  [archiveController release];
}

- (void)showScan:(Scan *)scan {
  [self clearImageView];
  [self presentResultForString:scan.text];
  [[self navigationController] popToViewController:self animated:YES];
}

@end