//
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// MWGridViewController.m
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// MWPhotoBrowser
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//
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// Created by Michael Waterfall on 08/10/2013.
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//
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//
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#import "MWGridViewController.h"
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#import "MWGridCell.h"
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#import "MWPhotoBrowserPrivate.h"
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#import "MWCommon.h"
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@interface MWGridViewController () {
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// Store margins for current setup
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CGFloat _margin, _gutter, _marginL, _gutterL, _columns, _columnsL;
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}
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@end
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@implementation MWGridViewController
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- (id)init {
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if ((self = [super initWithCollectionViewLayout:[UICollectionViewFlowLayout new]])) {
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// Defaults
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_columns = 3, _columnsL = 4;
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_margin = 0, _gutter = 1;
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_marginL = 0, _gutterL = 1;
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// For pixel perfection...
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if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
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// iPad
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_columns = 6, _columnsL = 8;
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_margin = 1, _gutter = 2;
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_marginL = 1, _gutterL = 2;
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} else if ([UIScreen mainScreen].bounds.size.height == 480) {
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// iPhone 3.5 inch
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_columns = 3, _columnsL = 4;
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_margin = 0, _gutter = 1;
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_marginL = 1, _gutterL = 2;
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} else {
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// iPhone 4 inch
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_columns = 3, _columnsL = 5;
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_margin = 0, _gutter = 1;
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_marginL = 0, _gutterL = 2;
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}
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_initialContentOffset = CGPointMake(0, CGFLOAT_MAX);
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}
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return self;
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}
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#pragma mark - View
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- (void)viewDidLoad {
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[super viewDidLoad];
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[self.collectionView registerClass:[MWGridCell class] forCellWithReuseIdentifier:@"GridCell"];
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self.collectionView.alwaysBounceVertical = YES;
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self.collectionView.backgroundColor = [UIColor blackColor];
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}
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- (void)viewWillDisappear:(BOOL)animated {
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// Cancel outstanding loading
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NSArray *visibleCells = [self.collectionView visibleCells];
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if (visibleCells) {
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for (MWGridCell *cell in visibleCells) {
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[cell.photo cancelAnyLoading];
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}
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}
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[super viewWillDisappear:animated];
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}
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- (void)viewWillLayoutSubviews {
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[super viewWillLayoutSubviews];
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[self performLayout];
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}
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- (void)viewDidLayoutSubviews {
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[super viewDidLayoutSubviews];
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}
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- (void)adjustOffsetsAsRequired {
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// Move to previous content offset
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if (_initialContentOffset.y != CGFLOAT_MAX) {
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self.collectionView.contentOffset = _initialContentOffset;
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[self.collectionView layoutIfNeeded]; // Layout after content offset change
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}
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// Check if current item is visible and if not, make it so!
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if (_browser.numberOfPhotos > 0) {
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NSIndexPath *currentPhotoIndexPath = [NSIndexPath indexPathForItem:_browser.currentIndex inSection:0];
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NSArray *visibleIndexPaths = [self.collectionView indexPathsForVisibleItems];
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BOOL currentVisible = NO;
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for (NSIndexPath *indexPath in visibleIndexPaths) {
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if ([indexPath isEqual:currentPhotoIndexPath]) {
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currentVisible = YES;
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break;
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}
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}
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if (!currentVisible) {
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[self.collectionView scrollToItemAtIndexPath:currentPhotoIndexPath atScrollPosition:UICollectionViewScrollPositionNone animated:NO];
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}
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}
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}
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- (void)performLayout {
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UINavigationBar *navBar = self.navigationController.navigationBar;
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self.collectionView.contentInset = UIEdgeInsetsMake(navBar.frame.origin.y + navBar.frame.size.height + [self getGutter], 0, 0, 0);
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}
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- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
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[self.collectionView reloadData];
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[self performLayout]; // needed for iOS 5 & 6
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}
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#pragma mark - Layout
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- (CGFloat)getColumns {
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if ((UIInterfaceOrientationIsPortrait(self.interfaceOrientation))) {
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return _columns;
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} else {
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return _columnsL;
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}
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}
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- (CGFloat)getMargin {
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if ((UIInterfaceOrientationIsPortrait(self.interfaceOrientation))) {
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return _margin;
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} else {
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return _marginL;
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}
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}
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- (CGFloat)getGutter {
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if ((UIInterfaceOrientationIsPortrait(self.interfaceOrientation))) {
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return _gutter;
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} else {
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return _gutterL;
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}
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}
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#pragma mark - Collection View
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- (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section {
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return [_browser numberOfPhotos];
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}
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- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
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MWGridCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"GridCell" forIndexPath:indexPath];
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if (!cell) {
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cell = [[MWGridCell alloc] init];
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}
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id <MWPhoto> photo = [_browser thumbPhotoAtIndex:indexPath.row];
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cell.photo = photo;
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cell.gridController = self;
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cell.selectionMode = _selectionMode;
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cell.isSelected = [_browser photoIsSelectedAtIndex:indexPath.row];
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cell.index = indexPath.row;
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UIImage *img = [_browser imageForPhoto:photo];
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if (img) {
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[cell displayImage];
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} else {
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[photo loadUnderlyingImageAndNotify];
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}
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return cell;
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}
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- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
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[_browser setCurrentPhotoIndex:indexPath.row];
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[_browser hideGrid];
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}
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- (void)collectionView:(UICollectionView *)collectionView didEndDisplayingCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath {
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[((MWGridCell *)cell).photo cancelAnyLoading];
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}
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- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
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CGFloat margin = [self getMargin];
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CGFloat gutter = [self getGutter];
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CGFloat columns = [self getColumns];
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CGFloat value = floorf(((self.view.bounds.size.width - (columns - 1) * gutter - 2 * margin) / columns));
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return CGSizeMake(value, value);
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}
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- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
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return [self getGutter];
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}
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- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section {
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return [self getGutter];
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}
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- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {
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CGFloat margin = [self getMargin];
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return UIEdgeInsetsMake(margin, margin, margin, margin);
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}
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@end
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