BlockAlertView.m

//
//  BlockAlertView.m
//
//
 
#import "BlockAlertView.h"
#import "BlockBackground.h"
#import "BlockUI.h"
 
@implementation BlockAlertView
 
@synthesize view = _view;
@synthesize backgroundImage = _backgroundImage;
@synthesize vignetteBackground = _vignetteBackground;
 
static UIImage *background = nil;
static UIImage *backgroundlandscape = nil;
static UIFont *titleFont = nil;
static UIFont *messageFont = nil;
static UIFont *buttonFont = nil;
 
#pragma mark - init
 
+ (void)initialize
{
  if (self == [BlockAlertView class])
  {
    background = [UIImage imageNamed:kAlertViewBackground];
    background =
        [[background stretchableImageWithLeftCapWidth:0
                                         topCapHeight:kAlertViewBackgroundCapHeight] retain];
 
    backgroundlandscape = [UIImage imageNamed:kAlertViewBackgroundLandscape];
    backgroundlandscape = [[backgroundlandscape
        stretchableImageWithLeftCapWidth:0
                            topCapHeight:kAlertViewBackgroundCapHeight] retain];
 
    titleFont = [kAlertViewTitleFont retain];
    messageFont = [kAlertViewMessageFont retain];
    buttonFont = [kAlertViewButtonFont retain];
  }
}
 
+ (BlockAlertView *)alertWithTitle:(NSString *)title message:(NSString *)message
{
  return [[[BlockAlertView alloc] initWithTitle:title message:message] autorelease];
}
 
+ (void)showInfoAlertWithTitle:(NSString *)title message:(NSString *)message
{
  BlockAlertView *alert = [[BlockAlertView alloc] initWithTitle:title message:message];
  [alert setCancelButtonWithTitle:NSLocalizedString(@"Dismiss", nil) block:nil];
  [alert show];
  [alert release];
}
 
+ (void)showErrorAlert:(NSError *)error
{
  BlockAlertView *alert = [[BlockAlertView alloc]
      initWithTitle:NSLocalizedString(@"Operation Failed", nil)
            message:[NSString
                        stringWithFormat:NSLocalizedString(
                                             @"The operation did not complete successfully: %@",
                                             nil),
                                         error]];
  [alert setCancelButtonWithTitle:@"Dismiss" block:nil];
  [alert show];
  [alert release];
}
 
#pragma mark - NSObject
 
- (void)addComponents:(CGRect)frame
{
  if (_title)
  {
    CGSize size = [_title sizeWithFont:titleFont
                     constrainedToSize:CGSizeMake(frame.size.width - kAlertViewBorder * 2, 1000)
                         lineBreakMode:NSLineBreakByWordWrapping];
 
    UILabel *labelView = [[UILabel alloc]
        initWithFrame:CGRectMake(kAlertViewBorder, _height,
                                 frame.size.width - kAlertViewBorder * 2, size.height)];
    labelView.font = titleFont;
    labelView.numberOfLines = 0;
    labelView.lineBreakMode = NSLineBreakByWordWrapping;
    labelView.textColor = kAlertViewTitleTextColor;
    labelView.backgroundColor = [UIColor clearColor];
    labelView.textAlignment = NSTextAlignmentCenter;
    labelView.shadowColor = kAlertViewTitleShadowColor;
    labelView.shadowOffset = kAlertViewTitleShadowOffset;
    labelView.text = _title;
    [_view addSubview:labelView];
    [labelView release];
 
    _height += size.height + kAlertViewBorder;
  }
 
  if (_message)
  {
    CGSize size =
        [_message sizeWithFont:messageFont
             constrainedToSize:CGSizeMake(frame.size.width - kAlertViewBorder * 2, 1000)
                 lineBreakMode:NSLineBreakByWordWrapping];
 
    UILabel *labelView = [[UILabel alloc]
        initWithFrame:CGRectMake(kAlertViewBorder, _height,
                                 frame.size.width - kAlertViewBorder * 2, size.height)];
    labelView.font = messageFont;
    labelView.numberOfLines = 0;
    labelView.lineBreakMode = NSLineBreakByWordWrapping;
    labelView.textColor = kAlertViewMessageTextColor;
    labelView.backgroundColor = [UIColor clearColor];
    labelView.textAlignment = NSTextAlignmentCenter;
    labelView.shadowColor = kAlertViewMessageShadowColor;
    labelView.shadowOffset = kAlertViewMessageShadowOffset;
    labelView.text = _message;
    [_view addSubview:labelView];
    [labelView release];
 
    _height += size.height + kAlertViewBorder;
  }
}
 
- (void)setupDisplay
{
  [[_view subviews] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
    [obj removeFromSuperview];
  }];
 
  UIWindow *parentView = [BlockBackground sharedInstance];
  CGRect frame = parentView.bounds;
  frame.origin.x = floorf((frame.size.width - background.size.width) * 0.5);
  frame.size.width = background.size.width;
 
  UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
  if (UIInterfaceOrientationIsLandscape(orientation))
  {
    frame.size.width += 150;
    frame.origin.x -= 75;
  }
 
  _view.frame = frame;
 
  _height = kAlertViewBorder + 15;
 
  if (NeedsLandscapePhoneTweaks)
  {
    _height -= 15; // landscape phones need to trimmed a bit
  }
 
  [self addComponents:frame];
 
  if (_shown)
    [self show];
}
 
- (id)initWithTitle:(NSString *)title message:(NSString *)message
{
  self = [super init];
 
  if (self)
  {
    _title = [title copy];
    _message = [message copy];
 
    _view = [[UIView alloc] init];
 
    _view.autoresizingMask =
        UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleTopMargin |
        UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;
 
    _blocks = [[NSMutableArray alloc] init];
 
    [[NSNotificationCenter defaultCenter]
        addObserver:self
           selector:@selector(setupDisplay)
               name:UIApplicationDidChangeStatusBarOrientationNotification
             object:nil];
 
    if ([self class] == [BlockAlertView class])
      [self setupDisplay];
 
    _vignetteBackground = NO;
  }
 
  return self;
}
 
- (void)dealloc
{
  [_title release];
  [_message release];
  [_backgroundImage release];
  [_view release];
  [_blocks release];
  [super dealloc];
}
 
#pragma mark - Public
 
- (void)addButtonWithTitle:(NSString *)title color:(NSString *)color block:(void (^)())block
{
  [_blocks addObject:[NSArray arrayWithObjects:block ? [[block copy] autorelease] : [NSNull null],
                                               title, color, nil]];
}
 
- (void)addButtonWithTitle:(NSString *)title block:(void (^)())block
{
  [self addButtonWithTitle:title color:@"gray" block:block];
}
 
- (void)setCancelButtonWithTitle:(NSString *)title block:(void (^)())block
{
  [self addButtonWithTitle:title color:@"black" block:block];
}
 
- (void)setDestructiveButtonWithTitle:(NSString *)title block:(void (^)())block
{
  [self addButtonWithTitle:title color:@"red" block:block];
}
 
- (void)show
{
  _shown = YES;
 
  BOOL isSecondButton = NO;
  NSUInteger index = 0;
  for (NSUInteger i = 0; i < _blocks.count; i++)
  {
    NSArray *block = [_blocks objectAtIndex:i];
    NSString *title = [block objectAtIndex:1];
    NSString *color = [block objectAtIndex:2];
 
    UIImage *image =
        [UIImage imageNamed:[NSString stringWithFormat:@"alert-%@-button.png", color]];
    image = [image stretchableImageWithLeftCapWidth:(int)(image.size.width + 1) >> 1
                                       topCapHeight:0];
 
    CGFloat maxHalfWidth = floorf((_view.bounds.size.width - kAlertViewBorder * 3) * 0.5);
    CGFloat width = _view.bounds.size.width - kAlertViewBorder * 2;
    CGFloat xOffset = kAlertViewBorder;
    if (isSecondButton)
    {
      width = maxHalfWidth;
      xOffset = width + kAlertViewBorder * 2;
      isSecondButton = NO;
    }
    else if (i + 1 < _blocks.count)
    {
      // In this case there's another button.
      // Let's check if they fit on the same line.
      CGSize size = [title sizeWithFont:buttonFont
                            minFontSize:10
                         actualFontSize:nil
                               forWidth:_view.bounds.size.width - kAlertViewBorder * 2
                          lineBreakMode:NSLineBreakByClipping];
 
      if (size.width < maxHalfWidth - kAlertViewBorder)
      {
        // It might fit. Check the next Button
        NSArray *block2 = [_blocks objectAtIndex:i + 1];
        NSString *title2 = [block2 objectAtIndex:1];
        size = [title2 sizeWithFont:buttonFont
                        minFontSize:10
                     actualFontSize:nil
                           forWidth:_view.bounds.size.width - kAlertViewBorder * 2
                      lineBreakMode:NSLineBreakByClipping];
 
        if (size.width < maxHalfWidth - kAlertViewBorder)
        {
          // They'll fit!
          isSecondButton = YES; // For the next iteration
          width = maxHalfWidth;
        }
      }
    }
    else if (_blocks.count == 1)
    {
      // In this case this is the ony button. We'll size according to the text
      CGSize size = [title sizeWithFont:buttonFont
                            minFontSize:10
                         actualFontSize:nil
                               forWidth:_view.bounds.size.width - kAlertViewBorder * 2
                          lineBreakMode:UILineBreakModeClip];
 
      size.width = MAX(size.width, 80);
      if (size.width + 2 * kAlertViewBorder < width)
      {
        width = size.width + 2 * kAlertViewBorder;
        xOffset = floorf((_view.bounds.size.width - width) * 0.5);
      }
    }
 
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake(xOffset, _height, width, kAlertButtonHeight);
    button.titleLabel.font = buttonFont;
    if (IOS_LESS_THAN_6)
    {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
      button.titleLabel.minimumFontSize = 10;
#pragma clang diagnostic pop
    }
    else
    {
      button.titleLabel.adjustsFontSizeToFitWidth = YES;
      button.titleLabel.adjustsLetterSpacingToFitWidth = YES;
      button.titleLabel.minimumScaleFactor = 0.1;
    }
    button.titleLabel.textAlignment = NSTextAlignmentCenter;
    button.titleLabel.shadowOffset = kAlertViewButtonShadowOffset;
    button.backgroundColor = [UIColor clearColor];
    button.tag = i + 1;
 
    [button setBackgroundImage:image forState:UIControlStateNormal];
    [button setTitleColor:kAlertViewButtonTextColor forState:UIControlStateNormal];
    [button setTitleShadowColor:kAlertViewButtonShadowColor forState:UIControlStateNormal];
    [button setTitle:title forState:UIControlStateNormal];
    button.accessibilityLabel = title;
 
    [button addTarget:self
                  action:@selector(buttonClicked:)
        forControlEvents:UIControlEventTouchUpInside];
 
    [_view addSubview:button];
 
    if (!isSecondButton)
      _height += kAlertButtonHeight + kAlertViewBorder;
 
    index++;
  }
 
  _height += 10; // Margin for the shadow
 
  if (_height < background.size.height)
  {
    CGFloat offset = background.size.height - _height;
    _height = background.size.height;
    CGRect frame;
    for (NSUInteger i = 0; i < _blocks.count; i++)
    {
      UIButton *btn = (UIButton *)[_view viewWithTag:i + 1];
      frame = btn.frame;
      frame.origin.y += offset;
      btn.frame = frame;
    }
  }
 
  CGRect frame = _view.frame;
  frame.origin.y = -_height;
  frame.size.height = _height;
  _view.frame = frame;
 
  UIImageView *modalBackground = [[UIImageView alloc] initWithFrame:_view.bounds];
 
  if (UIInterfaceOrientationIsLandscape([[UIApplication sharedApplication] statusBarOrientation]))
    modalBackground.image = backgroundlandscape;
  else
    modalBackground.image = background;
 
  modalBackground.contentMode = UIViewContentModeScaleToFill;
  modalBackground.autoresizingMask =
      UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
  [_view insertSubview:modalBackground atIndex:0];
  [modalBackground release];
 
  if (_backgroundImage)
  {
    [BlockBackground sharedInstance].backgroundImage = _backgroundImage;
    [_backgroundImage release];
    _backgroundImage = nil;
  }
 
  [BlockBackground sharedInstance].vignetteBackground = _vignetteBackground;
  [[BlockBackground sharedInstance] addToMainWindow:_view];
 
  __block CGPoint center = _view.center;
  center.y = floorf([BlockBackground sharedInstance].bounds.size.height * 0.5) + kAlertViewBounce;
 
  _cancelBounce = NO;
 
  [UIView animateWithDuration:0.4
      delay:0.0
      options:UIViewAnimationCurveEaseOut
      animations:^{
        [BlockBackground sharedInstance].alpha = 1.0f;
        _view.center = center;
      }
      completion:^(BOOL finished) {
        if (_cancelBounce)
          return;
 
        [UIView animateWithDuration:0.1
            delay:0.0
            options:0
            animations:^{
              center.y -= kAlertViewBounce;
              _view.center = center;
            }
            completion:^(BOOL finished) {
              [[NSNotificationCenter defaultCenter]
                  postNotificationName:@"AlertViewFinishedAnimations"
                                object:nil];
            }];
      }];
 
  [self retain];
}
 
- (void)dismissWithClickedButtonIndex:(NSInteger)buttonIndex animated:(BOOL)animated
{
  _shown = NO;
 
  [[NSNotificationCenter defaultCenter] removeObserver:self];
 
  if (buttonIndex >= 0 && buttonIndex < [_blocks count])
  {
    id obj = [[_blocks objectAtIndex:buttonIndex] objectAtIndex:0];
    if (![obj isEqual:[NSNull null]])
    {
      ((void (^)())obj)();
    }
  }
 
  if (animated)
  {
    [UIView animateWithDuration:0.1
        delay:0.0
        options:0
        animations:^{
          CGPoint center = _view.center;
          center.y += 20;
          _view.center = center;
        }
        completion:^(BOOL finished) {
          [UIView animateWithDuration:0.4
              delay:0.0
              options:UIViewAnimationCurveEaseIn
              animations:^{
                CGRect frame = _view.frame;
                frame.origin.y = -frame.size.height;
                _view.frame = frame;
                [[BlockBackground sharedInstance] reduceAlphaIfEmpty];
              }
              completion:^(BOOL finished) {
                [[BlockBackground sharedInstance] removeView:_view];
                [_view release];
                _view = nil;
                [self autorelease];
              }];
        }];
  }
  else
  {
    [[BlockBackground sharedInstance] removeView:_view];
    [_view release];
    _view = nil;
    [self autorelease];
  }
}
 
#pragma mark - Action
 
- (void)buttonClicked:(id)sender
{
  /* Run the button's block */
  int buttonIndex = [sender tag] - 1;
  [self dismissWithClickedButtonIndex:buttonIndex animated:YES];
}
 
@end