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GalleryViewController.m
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GalleryViewController.m
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//
// GalleryViewController.m
//
// Copyright (c) 2012 Symbiotic Software LLC. All rights reserved.
//
#import "GalleryViewController.h"
#import "ImageCache.h"
#import "PagedScrollView.h"
#define BACK @"\u25C4"
#define FORWARD @"\u25BA"
#define TAG_GALLERY_IMAGEVIEW 78
#define TAG_GALLERY_ACTIVITYVIEW 82
#define TAG_GALLERY_CAPTIONLABEL 87
@interface GalleryViewController () <PagedScrollViewDelegate>
{
UINavigationItem *navigationItem;
UINavigationBar *navigationBar;
PagedScrollView *pagedScrollView;
UIBarButtonItem *pageBackItem, *pageForwardItem;
UIToolbar *toolbar;
NSArray *rightToolbarItems;
}
@property (nonatomic, retain) NSArray *leftToolbarItems;
@property (nonatomic, assign) id<GalleryViewControllerDelegate> delegate;
- (void)done:(id)sender;
- (void)back:(id)sender;
- (void)forward:(id)sender;
@end
@implementation GalleryViewController
@synthesize leftToolbarItems;
@synthesize delegate;
@synthesize cacheToken;
+ (GalleryViewController *)galleryWithDelegate:(id<GalleryViewControllerDelegate>)delegate
{
GalleryViewController *galleryViewController = [[[GalleryViewController alloc] init] autorelease];
galleryViewController.delegate = delegate;
return galleryViewController;
}
- (void)dealloc
{
self.leftToolbarItems = nil;
pageBackItem = pageForwardItem = nil;
self.cacheToken = nil;
[super dealloc];
}
- (void)done:(id)sender
{
[self dismissModalViewControllerAnimated:YES];
}
- (void)back:(id)sender
{
[pagedScrollView back];
}
- (void)forward:(id)sender
{
[pagedScrollView forward];
}
- (NSUInteger)currentPicture
{
return pagedScrollView.currentPage;
}
#pragma mark - View lifecycle methods
- (void)viewDidLoad
{
CGRect frame;
UIImage *backImage, *forwardImage;
UIBarButtonItem *fixedItem, *flexItem;
NSUInteger numImages;
[super viewDidLoad];
self.view.backgroundColor = [UIColor blackColor];
// Add the navigation bar
frame = self.view.bounds;
frame.size.height = 44.0f;
navigationBar = [[[UINavigationBar alloc] initWithFrame:frame] autorelease];
navigationBar.barStyle = UIBarStyleBlack;
navigationItem = [[[UINavigationItem alloc] initWithTitle:[NSString stringWithFormat:@"1 of %d", numImages = [delegate numberOfImagesInGallery:self]]] autorelease];
navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(done:)] autorelease];
navigationBar.items = @[navigationItem];
[[[UIBarItem alloc] init] autorelease];
[self.view addSubview:navigationBar];
// Add the paged scroll view
pagedScrollView = [PagedScrollView pagedScrollViewWithDelegate:self];
frame = self.view.bounds;
frame.size.height -= 88.0f;
frame.origin.y = 44.0f;
pagedScrollView.frame = frame;
pagedScrollView.backgroundColor = [UIColor blackColor];
[self.view addSubview:pagedScrollView];
// Add the bottom bar
frame = self.view.bounds;
frame.origin.y = frame.size.height - 44.0f;
frame.size.height = 44.0f;
toolbar = [[[UIToolbar alloc] initWithFrame:frame] autorelease];
toolbar.barStyle = UIBarStyleBlack;
[self.view addSubview:toolbar];
// Set the left toolbar items
backImage = [UIImage imageNamed:@"icon_triangle_left.png"];
forwardImage = [UIImage imageNamed:@"icon_triangle_right.png"];
if(backImage && forwardImage)
{
pageBackItem = [[[UIBarButtonItem alloc] initWithImage:backImage style:UIBarButtonItemStylePlain target:self action:@selector(back:)] autorelease];
pageForwardItem = [[[UIBarButtonItem alloc] initWithImage:forwardImage style:UIBarButtonItemStylePlain target:self action:@selector(forward:)] autorelease];
}
else
{
pageBackItem = [[[UIBarButtonItem alloc] initWithTitle:BACK style:UIBarButtonItemStylePlain target:self action:@selector(back:)] autorelease];
pageForwardItem = [[[UIBarButtonItem alloc] initWithTitle:FORWARD style:UIBarButtonItemStylePlain target:self action:@selector(forward:)] autorelease];
}
pageBackItem.enabled = NO;
pageForwardItem.enabled = (numImages > 1);
fixedItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil] autorelease];
fixedItem.width = 10.0f;
flexItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil] autorelease];
self.leftToolbarItems = @[pageBackItem, fixedItem, pageForwardItem, flexItem];
rightToolbarItems = [delegate toolbarItemsForImageNumbered:0];
toolbar.items = [leftToolbarItems arrayByAddingObjectsFromArray:rightToolbarItems];
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[pagedScrollView reloadPages];
}
#pragma mark - PagedScrollViewDelegate methods
- (NSUInteger)numberOfPagesInPagedScrollView:(PagedScrollView *)pagedScrollView
{
return [delegate numberOfImagesInGallery:self];
}
- (void)loadView:(UIView *)view forPage:(NSUInteger)page
{
UIImageView *imageView;
UIActivityIndicatorView *activityView;
UILabel *captionLabel;
if(![view viewWithTag:TAG_GALLERY_IMAGEVIEW])
{
UIFont *font;
CGRect frame;
// Setup the subviews
imageView = [[[UIImageView alloc] initWithFrame:view.bounds] autorelease];
imageView.backgroundColor = [UIColor clearColor];
imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.tag = TAG_GALLERY_IMAGEVIEW;
[view addSubview:imageView];
activityView = [[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite] autorelease];
activityView.tag = TAG_GALLERY_ACTIVITYVIEW;
activityView.center = imageView.center;
[view addSubview:activityView];
font = [UIFont boldSystemFontOfSize:12.0f];
frame = view.bounds;
frame.origin.y = frame.size.height - font.lineHeight;
frame.size.height = font.lineHeight;
captionLabel = [[[UILabel alloc] initWithFrame:frame] autorelease];
captionLabel.font = font;
captionLabel.backgroundColor = [UIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:0.5f];
captionLabel.textColor = [UIColor whiteColor];
captionLabel.textAlignment = UITextAlignmentCenter;
captionLabel.tag = TAG_GALLERY_CAPTIONLABEL;
[view addSubview:captionLabel];
}
else
{
imageView = (UIImageView *)[view viewWithTag:TAG_GALLERY_IMAGEVIEW];
captionLabel = (UILabel *)[view viewWithTag:TAG_GALLERY_CAPTIONLABEL];
activityView = (UIActivityIndicatorView *)[view viewWithTag:TAG_GALLERY_ACTIVITYVIEW];
}
if([delegate respondsToSelector:@selector(imageNumbered:)])
imageView.image = [delegate imageNumbered:page];
else
imageView.image = nil;
if([delegate respondsToSelector:@selector(captionForImageNumbered:)])
captionLabel.text = [delegate captionForImageNumbered:page];
else
captionLabel.text = nil;
captionLabel.hidden = (captionLabel.text == nil);
if(imageView.image == nil && [delegate respondsToSelector:@selector(urlForImageNumbered:)])
{
activityView.hidden = NO;
[activityView startAnimating];
[[ImageCache sharedCache] loadImageView:imageView
withUrl:[delegate urlForImageNumbered:page]
withKey:[NSString stringWithFormat:@"%@_%d", cacheToken, page]
completion:^(NSString *errorMessage) {
if(errorMessage)
captionLabel.text = errorMessage;
[activityView stopAnimating];
activityView.hidden = YES;
}];
}
else
{
[[ImageCache sharedCache] cancelLoadForImageView:imageView];
}
}
- (void)pagedScrollView:(PagedScrollView *)pagedScrollView enteredPage:(NSUInteger)page
{
NSUInteger numImages;
if([delegate respondsToSelector:@selector(toolbarItemsForImageNumbered:)])
{
NSArray *newRightToolbarItems = [delegate toolbarItemsForImageNumbered:page];
if(rightToolbarItems != newRightToolbarItems)
{
rightToolbarItems = newRightToolbarItems;
toolbar.items = [leftToolbarItems arrayByAddingObjectsFromArray:rightToolbarItems];
}
}
numImages = [delegate numberOfImagesInGallery:self];
pageBackItem.enabled = (page > 0);
pageForwardItem.enabled = ((page + 1) < numImages);
navigationItem.title = [NSString stringWithFormat:@"%d of %d", page + 1, numImages];
}
@end