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iCarousel.m
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//
// iCarousel.m
//
// Version 1.8.3
//
// Created by Nick Lockwood on 01/04/2011.
// Copyright 2011 Charcoal Design
//
// Distributed under the permissive zlib License
// Get the latest version from here:
//
// https://github.com/nicklockwood/iCarousel
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
//
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
//
// 3. This notice may not be removed or altered from any source distribution.
//
#import "iCarousel.h"
#import <objc/message.h>
#import <tgmath.h>
#import <Availability.h>
#if !__has_feature(objc_arc)
#error This class requires automatic reference counting
#endif
#if !defined(__has_warning) || __has_warning("-Wreceiver-is-weak")
# pragma GCC diagnostic ignored "-Wreceiver-is-weak"
#endif
#pragma clang diagnostic ignored "-Warc-repeated-use-of-weak"
#pragma clang diagnostic ignored "-Wobjc-missing-property-synthesis"
#pragma clang diagnostic ignored "-Wdirect-ivar-access"
#pragma clang diagnostic ignored "-Wunused-macros"
#pragma clang diagnostic ignored "-Wconversion"
#pragma clang diagnostic ignored "-Wformat-nonliteral"
#pragma clang diagnostic ignored "-Wpartial-availability"
#pragma clang diagnostic ignored "-Wdouble-promotion"
#pragma clang diagnostic ignored "-Wselector"
#pragma clang diagnostic ignored "-Wgnu"
#define MIN_TOGGLE_DURATION 0.2
#define MAX_TOGGLE_DURATION 0.4
#define SCROLL_DURATION 0.4
#define INSERT_DURATION 0.4
#define DECELERATE_THRESHOLD 0.1
#define SCROLL_SPEED_THRESHOLD 2.0
#define SCROLL_DISTANCE_THRESHOLD 0.1
#define DECELERATION_MULTIPLIER 30.0
#define FLOAT_ERROR_MARGIN 0.000001
#ifdef ICAROUSEL_MACOS
#define MAX_VISIBLE_ITEMS 50
#else
#define MAX_VISIBLE_ITEMS 30
#endif
@implementation NSObject (iCarousel)
- (NSUInteger)numberOfPlaceholdersInCarousel:(__unused iCarousel *)carousel { return 0; }
- (void)carouselWillBeginScrollingAnimation:(__unused iCarousel *)carousel {}
- (void)carouselDidEndScrollingAnimation:(__unused iCarousel *)carousel {}
- (void)carouselDidScroll:(__unused iCarousel *)carousel {}
- (void)carouselCurrentItemIndexDidChange:(__unused iCarousel *)carousel {}
- (void)carouselWillBeginDragging:(__unused iCarousel *)carousel {}
- (void)carouselDidEndDragging:(__unused iCarousel *)carousel willDecelerate:(__unused BOOL)decelerate {}
- (void)carouselWillBeginDecelerating:(__unused iCarousel *)carousel {}
- (void)carouselDidEndDecelerating:(__unused iCarousel *)carousel {}
- (BOOL)carousel:(__unused iCarousel *)carousel shouldSelectItemAtIndex:(__unused NSInteger)index { return YES; }
- (void)carousel:(__unused iCarousel *)carousel didSelectItemAtIndex:(__unused NSInteger)index {}
- (CGFloat)carouselItemWidth:(__unused iCarousel *)carousel { return 0; }
- (CATransform3D)carousel:(__unused iCarousel *)carousel
itemTransformForOffset:(__unused CGFloat)offset
baseTransform:(CATransform3D)transform { return transform; }
- (CGFloat)carousel:(__unused iCarousel *)carousel
valueForOption:(__unused iCarouselOption)option
withDefault:(CGFloat)value { return value; }
@end
@interface iCarousel ()
@property (nonatomic, strong) UIView *contentView;
@property (nonatomic, strong) NSMutableDictionary *itemViews;
@property (nonatomic, strong) NSMutableSet *itemViewPool;
@property (nonatomic, strong) NSMutableSet *placeholderViewPool;
@property (nonatomic, assign) CGFloat previousScrollOffset;
@property (nonatomic, assign) NSInteger previousItemIndex;
@property (nonatomic, assign) NSInteger numberOfPlaceholdersToShow;
@property (nonatomic, assign) NSInteger numberOfVisibleItems;
@property (nonatomic, assign) CGFloat itemWidth;
@property (nonatomic, assign) CGFloat offsetMultiplier;
@property (nonatomic, assign) CGFloat startOffset;
@property (nonatomic, assign) CGFloat endOffset;
@property (nonatomic, assign) NSTimeInterval scrollDuration;
@property (nonatomic, assign, getter = isScrolling) BOOL scrolling;
@property (nonatomic, assign) NSTimeInterval startTime;
@property (nonatomic, assign) NSTimeInterval lastTime;
@property (nonatomic, assign) CGFloat startVelocity;
@property (nonatomic, strong) NSTimer *timer;
@property (nonatomic, assign, getter = isDecelerating) BOOL decelerating;
@property (nonatomic, assign) CGFloat previousTranslation;
@property (nonatomic, assign, getter = isWrapEnabled) BOOL wrapEnabled;
@property (nonatomic, assign, getter = isDragging) BOOL dragging;
@property (nonatomic, assign) BOOL didDrag;
@property (nonatomic, assign) NSTimeInterval toggleTime;
NSComparisonResult compareViewDepth(UIView *view1, UIView *view2, iCarousel *self);
@end
@implementation iCarousel
#pragma mark -
#pragma mark Initialisation
- (void)setUp
{
_decelerationRate = 0.95;
_scrollEnabled = YES;
_bounces = YES;
_offsetMultiplier = 1.0;
_perspective = -1.0/500.0;
_contentOffset = CGSizeZero;
_viewpointOffset = CGSizeZero;
_scrollSpeed = 1.0;
_bounceDistance = 1.0;
_stopAtItemBoundary = YES;
_scrollToItemBoundary = YES;
_ignorePerpendicularSwipes = YES;
_centerItemWhenSelected = YES;
_contentView = [[UIView alloc] initWithFrame:self.bounds];
#ifdef ICAROUSEL_IOS
_contentView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
//add pan gesture recogniser
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(didPan:)];
panGesture.delegate = (id <UIGestureRecognizerDelegate>)self;
[_contentView addGestureRecognizer:panGesture];
//add tap gesture recogniser
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(didTap:)];
tapGesture.delegate = (id <UIGestureRecognizerDelegate>)self;
[_contentView addGestureRecognizer:tapGesture];
//set up accessibility
self.accessibilityTraits = UIAccessibilityTraitAllowsDirectInteraction;
self.isAccessibilityElement = YES;
#else
[_contentView setWantsLayer:YES];
#endif
[self addSubview:_contentView];
if (_dataSource)
{
[self reloadData];
}
}
#ifndef USING_CHAMELEON
- (id)initWithCoder:(NSCoder *)aDecoder
{
if ((self = [super initWithCoder:aDecoder]))
{
[self setUp];
if (self.superview)
{
[self startAnimation];
}
}
return self;
}
#endif
#ifdef ICAROUSEL_IOS
- (id)initWithFrame:(CGRect)frame
#else
- (id)initWithFrame:(NSRect)frame
#endif
{
if ((self = [super initWithFrame:frame]))
{
[self setUp];
}
return self;
}
- (void)dealloc
{
[self stopAnimation];
}
- (void)setDataSource:(id<iCarouselDataSource>)dataSource
{
if (_dataSource != dataSource)
{
_dataSource = dataSource;
if (_dataSource)
{
[self reloadData];
}
}
}
- (void)setDelegate:(id<iCarouselDelegate>)delegate
{
if (_delegate != delegate)
{
_delegate = delegate;
if (_delegate && _dataSource)
{
[self setNeedsLayout];
}
}
}
- (void)setType:(iCarouselType)type
{
if (_type != type)
{
_type = type;
[self layOutItemViews];
}
}
- (void)setVertical:(BOOL)vertical
{
if (_vertical != vertical)
{
_vertical = vertical;
[self layOutItemViews];
}
}
- (void)setScrollOffset:(CGFloat)scrollOffset
{
_scrolling = NO;
_decelerating = NO;
_startOffset = scrollOffset;
_endOffset = scrollOffset;
if (fabs(_scrollOffset - scrollOffset) > 0.0)
{
_scrollOffset = scrollOffset;
[self depthSortViews];
[self didScroll];
}
}
- (void)setCurrentItemIndex:(NSInteger)currentItemIndex
{
[self setScrollOffset:currentItemIndex];
}
- (void)setPerspective:(CGFloat)perspective
{
_perspective = perspective;
[self transformItemViews];
}
- (void)setViewpointOffset:(CGSize)viewpointOffset
{
if (!CGSizeEqualToSize(_viewpointOffset, viewpointOffset))
{
_viewpointOffset = viewpointOffset;
[self transformItemViews];
}
}
- (void)setContentOffset:(CGSize)contentOffset
{
if (!CGSizeEqualToSize(_contentOffset, contentOffset))
{
_contentOffset = contentOffset;
[self layOutItemViews];
}
}
- (void)setAutoscroll:(CGFloat)autoscroll
{
_autoscroll = autoscroll;
if (autoscroll != 0.0) [self startAnimation];
}
- (void)pushAnimationState:(BOOL)enabled
{
[CATransaction begin];
[CATransaction setDisableActions:!enabled];
}
- (void)popAnimationState
{
[CATransaction commit];
}
#pragma mark -
#pragma mark View management
- (NSArray *)indexesForVisibleItems
{
return [[_itemViews allKeys] sortedArrayUsingSelector:@selector(compare:)];
}
- (NSArray *)visibleItemViews
{
NSArray *indexes = [self indexesForVisibleItems];
return [_itemViews objectsForKeys:indexes notFoundMarker:[NSNull null]];
}
- (UIView *)itemViewAtIndex:(NSInteger)index
{
return _itemViews[@(index)];
}
- (UIView *)currentItemView
{
return [self itemViewAtIndex:self.currentItemIndex];
}
- (NSInteger)indexOfItemView:(UIView *)view
{
NSInteger index = [[_itemViews allValues] indexOfObject:view];
if (index != NSNotFound)
{
return [[_itemViews allKeys][index] integerValue];
}
return NSNotFound;
}
- (NSInteger)indexOfItemViewOrSubview:(UIView *)view
{
NSInteger index = [self indexOfItemView:view];
if (index == NSNotFound && view.superview && view != _contentView)
{
return [self indexOfItemViewOrSubview:(UIView *__nonnull)view.superview];
}
return index;
}
- (UIView *)itemViewAtPoint:(CGPoint)point
{
for (UIView *view in [[[_itemViews allValues] sortedArrayUsingFunction:(NSInteger (*)(id, id, void *))compareViewDepth context:(__bridge void *)self] reverseObjectEnumerator])
{
if ([view.superview.layer hitTest:point])
{
return view;
}
}
return nil;
}
- (void)setItemView:(UIView *)view forIndex:(NSInteger)index
{
_itemViews[@(index)] = view;
}
- (void)removeViewAtIndex:(NSInteger)index
{
NSMutableDictionary *newItemViews = [NSMutableDictionary dictionaryWithCapacity:[_itemViews count] - 1];
for (NSNumber *number in [self indexesForVisibleItems])
{
NSInteger i = [number integerValue];
if (i < index)
{
newItemViews[number] = _itemViews[number];
}
else if (i > index)
{
newItemViews[@(i - 1)] = _itemViews[number];
}
}
self.itemViews = newItemViews;
}
- (void)insertView:(UIView *)view atIndex:(NSInteger)index
{
NSMutableDictionary *newItemViews = [NSMutableDictionary dictionaryWithCapacity:[_itemViews count] + 1];
for (NSNumber *number in [self indexesForVisibleItems])
{
NSInteger i = [number integerValue];
if (i < index)
{
newItemViews[number] = _itemViews[number];
}
else
{
newItemViews[@(i + 1)] = _itemViews[number];
}
}
if (view)
{
[self setItemView:view forIndex:index];
}
self.itemViews = newItemViews;
}
#pragma mark -
#pragma mark View layout
- (CGFloat)alphaForItemWithOffset:(CGFloat)offset
{
CGFloat fadeMin = (CGFloat)-INFINITY;
CGFloat fadeMax = (CGFloat)INFINITY;
CGFloat fadeRange = 1.0;
CGFloat fadeMinAlpha = 0.0;
switch (_type)
{
case iCarouselTypeTimeMachine:
{
fadeMax = 0.0;
break;
}
case iCarouselTypeInvertedTimeMachine:
{
fadeMin = 0.0;
break;
}
case iCarouselTypeCoverFlow:
case iCarouselTypeCoverFlow2:
case iCarouselTypeCustom:
case iCarouselTypeCylinder:
case iCarouselTypeInvertedCylinder:
case iCarouselTypeRotary:
case iCarouselTypeInvertedRotary:
case iCarouselTypeWheel:
case iCarouselTypeInvertedWheel:
case iCarouselTypeLinear:
{
//do nothing
}
}
fadeMin = [self valueForOption:iCarouselOptionFadeMin withDefault:fadeMin];
fadeMax = [self valueForOption:iCarouselOptionFadeMax withDefault:fadeMax];
fadeRange = [self valueForOption:iCarouselOptionFadeRange withDefault:fadeRange];
fadeMinAlpha = [self valueForOption:iCarouselOptionFadeMinAlpha withDefault:fadeMinAlpha];
#ifdef ICAROUSEL_MACOS
if (_vertical)
{
//invert
offset = -offset;
}
#endif
CGFloat factor = 0.0;
if (offset > fadeMax)
{
factor = offset - fadeMax;
}
else if (offset < fadeMin)
{
factor = fadeMin - offset;
}
return 1.0 - MIN(factor, fadeRange) / fadeRange * (1.0 - fadeMinAlpha);
}
- (CGFloat)valueForOption:(iCarouselOption)option withDefault:(CGFloat)value
{
return _delegate? [_delegate carousel:self valueForOption:option withDefault:value]: value;
}
- (CATransform3D)transformForItemViewWithOffset:(CGFloat)offset
{
//set up base transform
CATransform3D transform = CATransform3DIdentity;
transform.m34 = _perspective;
transform = CATransform3DTranslate(transform, -_viewpointOffset.width, -_viewpointOffset.height, 0.0);
//perform transform
switch (_type)
{
case iCarouselTypeCustom:
{
return [_delegate carousel:self itemTransformForOffset:offset baseTransform:transform];
}
case iCarouselTypeLinear:
{
CGFloat spacing = [self valueForOption:iCarouselOptionSpacing withDefault:1.0];
if (_vertical)
{
return CATransform3DTranslate(transform, 0.0, offset * _itemWidth * spacing, 0.0);
}
else
{
return CATransform3DTranslate(transform, offset * _itemWidth * spacing, 0.0, 0.0);
}
}
case iCarouselTypeRotary:
case iCarouselTypeInvertedRotary:
{
CGFloat count = [self circularCarouselItemCount];
CGFloat spacing = [self valueForOption:iCarouselOptionSpacing withDefault:1.0];
CGFloat arc = [self valueForOption:iCarouselOptionArc withDefault:M_PI * 2.0];
CGFloat radius = [self valueForOption:iCarouselOptionRadius withDefault:MAX(_itemWidth * spacing / 2.0, _itemWidth * spacing / 2.0 / tan(arc/2.0/count))];
CGFloat angle = [self valueForOption:iCarouselOptionAngle withDefault:offset / count * arc];
if (_type == iCarouselTypeInvertedRotary)
{
radius = -radius;
angle = -angle;
}
if (_vertical)
{
return CATransform3DTranslate(transform, 0.0, radius * sin(angle), radius * cos(angle) - radius);
}
else
{
return CATransform3DTranslate(transform, radius * sin(angle), 0.0, radius * cos(angle) - radius);
}
}
case iCarouselTypeCylinder:
case iCarouselTypeInvertedCylinder:
{
CGFloat count = [self circularCarouselItemCount];
CGFloat spacing = [self valueForOption:iCarouselOptionSpacing withDefault:1.0];
CGFloat arc = [self valueForOption:iCarouselOptionArc withDefault:M_PI * 2.0];
CGFloat radius = [self valueForOption:iCarouselOptionRadius withDefault:MAX(0.01, _itemWidth * spacing / 2.0 / tan(arc/2.0/count))];
CGFloat angle = [self valueForOption:iCarouselOptionAngle withDefault:offset / count * arc];
if (_type == iCarouselTypeInvertedCylinder)
{
radius = -radius;
angle = -angle;
}
if (_vertical)
{
transform = CATransform3DTranslate(transform, 0.0, 0.0, -radius);
transform = CATransform3DRotate(transform, angle, -1.0, 0.0, 0.0);
return CATransform3DTranslate(transform, 0.0, 0.0, radius + 0.01);
}
else
{
transform = CATransform3DTranslate(transform, 0.0, 0.0, -radius);
transform = CATransform3DRotate(transform, angle, 0.0, 1.0, 0.0);
return CATransform3DTranslate(transform, 0.0, 0.0, radius + 0.01);
}
}
case iCarouselTypeWheel:
case iCarouselTypeInvertedWheel:
{
CGFloat count = [self circularCarouselItemCount];
CGFloat spacing = [self valueForOption:iCarouselOptionSpacing withDefault:1.0];
CGFloat arc = [self valueForOption:iCarouselOptionArc withDefault:M_PI * 2.0];
CGFloat radius = [self valueForOption:iCarouselOptionRadius withDefault:_itemWidth * spacing * count / arc];
CGFloat angle = [self valueForOption:iCarouselOptionAngle withDefault:arc / count];
if (_type == iCarouselTypeInvertedWheel)
{
radius = -radius;
angle = -angle;
}
if (_vertical)
{
transform = CATransform3DTranslate(transform, -radius, 0.0, 0.0);
transform = CATransform3DRotate(transform, angle * offset, 0.0, 0.0, 1.0);
return CATransform3DTranslate(transform, radius, 0.0, offset * 0.01);
}
else
{
transform = CATransform3DTranslate(transform, 0.0, radius, 0.0);
transform = CATransform3DRotate(transform, angle * offset, 0.0, 0.0, 1.0);
return CATransform3DTranslate(transform, 0.0, -radius, offset * 0.01);
}
}
case iCarouselTypeCoverFlow:
case iCarouselTypeCoverFlow2:
{
CGFloat tilt = [self valueForOption:iCarouselOptionTilt withDefault:0.9];
CGFloat spacing = [self valueForOption:iCarouselOptionSpacing withDefault:0.25];
CGFloat clampedOffset = MAX(-1.0, MIN(1.0, offset));
if (_type == iCarouselTypeCoverFlow2)
{
if (_toggle > 0.0)
{
if (offset <= -0.5)
{
clampedOffset = -1.0;
}
else if (offset <= 0.5)
{
clampedOffset = -_toggle;
}
else if (offset <= 1.5)
{
clampedOffset = 1.0 - _toggle;
}
}
else
{
if (offset > 0.5)
{
clampedOffset = 1.0;
}
else if (offset > -0.5)
{
clampedOffset = -_toggle;
}
else if (offset > -1.5)
{
clampedOffset = - 1.0 - _toggle;
}
}
}
CGFloat x = (clampedOffset * 0.5 * tilt + offset * spacing) * _itemWidth;
CGFloat z = fabs(clampedOffset) * -_itemWidth * 0.5;
if (_vertical)
{
transform = CATransform3DTranslate(transform, 0.0, x, z);
return CATransform3DRotate(transform, -clampedOffset * M_PI_2 * tilt, -1.0, 0.0, 0.0);
}
else
{
transform = CATransform3DTranslate(transform, x, 0.0, z);
return CATransform3DRotate(transform, -clampedOffset * M_PI_2 * tilt, 0.0, 1.0, 0.0);
}
}
case iCarouselTypeTimeMachine:
case iCarouselTypeInvertedTimeMachine:
{
CGFloat tilt = [self valueForOption:iCarouselOptionTilt withDefault:0.3];
CGFloat spacing = [self valueForOption:iCarouselOptionSpacing withDefault:1.0];
if (_type == iCarouselTypeInvertedTimeMachine)
{
tilt = -tilt;
offset = -offset;
}
if (_vertical)
{
#ifdef ICAROUSEL_MACOS
//invert again
tilt = -tilt;
offset = -offset;
#endif
return CATransform3DTranslate(transform, 0.0, offset * _itemWidth * tilt, offset * _itemWidth * spacing);
}
else
{
return CATransform3DTranslate(transform, offset * _itemWidth * tilt, 0.0, offset * _itemWidth * spacing);
}
}
}
}
NSComparisonResult compareViewDepth(UIView *view1, UIView *view2, iCarousel *self)
{
//compare depths
CATransform3D t1 = view1.superview.layer.transform;
CATransform3D t2 = view2.superview.layer.transform;
CGFloat z1 = t1.m13 + t1.m23 + t1.m33 + t1.m43;
CGFloat z2 = t2.m13 + t2.m23 + t2.m33 + t2.m43;
CGFloat difference = z1 - z2;
//if depths are equal, compare distance from current view
if (difference == 0.0)
{
CATransform3D t3 = [self currentItemView].superview.layer.transform;
if (self.vertical)
{
CGFloat y1 = t1.m12 + t1.m22 + t1.m32 + t1.m42;
CGFloat y2 = t2.m12 + t2.m22 + t2.m32 + t2.m42;
CGFloat y3 = t3.m12 + t3.m22 + t3.m32 + t3.m42;
difference = fabs(y2 - y3) - fabs(y1 - y3);
}
else
{
CGFloat x1 = t1.m11 + t1.m21 + t1.m31 + t1.m41;
CGFloat x2 = t2.m11 + t2.m21 + t2.m31 + t2.m41;
CGFloat x3 = t3.m11 + t3.m21 + t3.m31 + t3.m41;
difference = fabs(x2 - x3) - fabs(x1 - x3);
}
}
return (difference < 0.0)? NSOrderedAscending: NSOrderedDescending;
}
#ifdef ICAROUSEL_IOS
- (void)depthSortViews
{
for (UIView *view in [[_itemViews allValues] sortedArrayUsingFunction:(NSInteger (*)(id, id, void *))compareViewDepth context:(__bridge void *)self])
{
[_contentView bringSubviewToFront:(UIView *__nonnull)view.superview];
}
}
#else
- (void)setNeedsLayout
{
[self setNeedsLayout:YES];
}
- (void)depthSortViews
{
//does nothing on Mac OS
}
#endif
- (CGFloat)offsetForItemAtIndex:(NSInteger)index
{
//calculate relative position
CGFloat offset = index - _scrollOffset;
if (_wrapEnabled)
{
if (offset > _numberOfItems/2.0)
{
offset -= _numberOfItems;
}
else if (offset < -_numberOfItems/2.0)
{
offset += _numberOfItems;
}
}
#ifdef ICAROUSEL_MACOS
if (_vertical)
{
//invert transform
offset = -offset;
}
#endif
return offset;
}
- (UIView *)containView:(UIView *)view
{
//set item width
if (!_itemWidth)
{
_itemWidth = _vertical? view.bounds.size.height: view.bounds.size.width;
}
//set container frame
CGRect frame = view.bounds;
frame.size.width = _vertical? frame.size.width: _itemWidth;
frame.size.height = _vertical? _itemWidth: frame.size.height;
UIView *containerView = [[UIView alloc] initWithFrame:frame];
#ifdef ICAROUSEL_MACOS
//clipping works differently on Mac OS
[containerView setBoundsSize:view.frame.size];
#endif
//set view frame
frame = view.frame;
frame.origin.x = (containerView.bounds.size.width - frame.size.width) / 2.0;
frame.origin.y = (containerView.bounds.size.height - frame.size.height) / 2.0;
view.frame = frame;
[containerView addSubview:view];
containerView.layer.opacity = 0;
return containerView;
}
- (void)transformItemView:(UIView *)view atIndex:(NSInteger)index
{
//calculate offset
CGFloat offset = [self offsetForItemAtIndex:index];
//update alpha
view.superview.layer.opacity = [self alphaForItemWithOffset:offset];
#ifdef ICAROUSEL_IOS
//center view
view.superview.center = CGPointMake(self.bounds.size.width/2.0 + _contentOffset.width,
self.bounds.size.height/2.0 + _contentOffset.height);
//enable/disable interaction
view.superview.userInteractionEnabled = (!_centerItemWhenSelected || index == self.currentItemIndex);
//account for retina
view.superview.layer.rasterizationScale = [UIScreen mainScreen].scale;
[view layoutIfNeeded];
#else
//center view
[view.superview setFrameOrigin:NSMakePoint(self.bounds.size.width/2.0 + _contentOffset.width,
self.bounds.size.height/2.0 + _contentOffset.height)];
view.superview.layer.anchorPoint = CGPointMake(0.5, 0.5);
//account for retina
view.superview.layer.rasterizationScale = view.window.screen.backingScaleFactor;
#endif
//special-case logic for iCarouselTypeCoverFlow2
CGFloat clampedOffset = MAX(-1.0, MIN(1.0, offset));
if (_decelerating || (_scrolling && !_dragging && !_didDrag) || (_autoscroll && !_dragging) ||
(!_wrapEnabled && (_scrollOffset < 0 || _scrollOffset >= _numberOfItems - 1)))
{
if (offset > 0)
{
_toggle = (offset <= 0.5)? -clampedOffset: (1.0 - clampedOffset);
}
else
{
_toggle = (offset > -0.5)? -clampedOffset: (- 1.0 - clampedOffset);
}
}
//calculate transform
CATransform3D transform = [self transformForItemViewWithOffset:offset];
//transform view
view.superview.layer.transform = transform;
//backface culling
BOOL showBackfaces = view.layer.doubleSided;
if (showBackfaces)
{
switch (_type)
{
case iCarouselTypeInvertedCylinder:
{
showBackfaces = NO;
break;
}
case iCarouselTypeCoverFlow:
case iCarouselTypeCoverFlow2:
case iCarouselTypeCustom:
case iCarouselTypeCylinder:
case iCarouselTypeRotary:
case iCarouselTypeInvertedRotary:
case iCarouselTypeWheel:
case iCarouselTypeInvertedWheel:
case iCarouselTypeLinear:
case iCarouselTypeTimeMachine:
case iCarouselTypeInvertedTimeMachine:
{
showBackfaces = YES;
break;
}
}
}
showBackfaces = !![self valueForOption:iCarouselOptionShowBackfaces withDefault:showBackfaces];
//we can't just set the layer.doubleSided property because it doesn't block interaction
//instead we'll calculate if the view is front-facing based on the transform
view.superview.hidden = !(showBackfaces ?: (transform.m33 > 0.0));
}
#ifdef ICAROUSEL_MACOS
- (void)resizeSubviewsWithOldSize:(__unused NSSize)oldSize
{
[self pushAnimationState:NO];
_contentView.frame = self.bounds;
[self layOutItemViews];
[self popAnimationState];
}
#else
- (void)layoutSubviews
{
[super layoutSubviews];
_contentView.frame = self.bounds;
[self layOutItemViews];
}
#endif
- (void)transformItemViews
{
for (NSNumber *number in _itemViews)
{
NSInteger index = [number integerValue];
UIView *view = _itemViews[number];
[self transformItemView:view atIndex:index];
}
}
- (void)updateItemWidth
{
_itemWidth = [_delegate carouselItemWidth:self] ?: _itemWidth;
if (_numberOfItems > 0)
{
if ([_itemViews count] == 0)
{
[self loadViewAtIndex:0];
}
}
else if (_numberOfPlaceholders > 0)
{
if ([_itemViews count] == 0)
{
[self loadViewAtIndex:-1];
}
}
}
- (void)updateNumberOfVisibleItems
{
//get number of visible items
switch (_type)
{
case iCarouselTypeLinear:
{
//exact number required to fill screen
CGFloat spacing = [self valueForOption:iCarouselOptionSpacing withDefault:1.0];
CGFloat width = _vertical ? self.bounds.size.height: self.bounds.size.width;
CGFloat itemWidth = _itemWidth * spacing;
_numberOfVisibleItems = ceil(width / itemWidth) + 2;
break;
}
case iCarouselTypeCoverFlow:
case iCarouselTypeCoverFlow2:
{
//exact number required to fill screen
CGFloat spacing = [self valueForOption:iCarouselOptionSpacing withDefault:0.25];
CGFloat width = _vertical ? self.bounds.size.height: self.bounds.size.width;
CGFloat itemWidth = _itemWidth * spacing;
_numberOfVisibleItems = ceil(width / itemWidth) + 2;
break;
}
case iCarouselTypeRotary:
case iCarouselTypeCylinder:
{
//based on count value
_numberOfVisibleItems = [self circularCarouselItemCount];
break;
}
case iCarouselTypeInvertedRotary:
case iCarouselTypeInvertedCylinder:
{
//TODO: improve this
_numberOfVisibleItems = ceil([self circularCarouselItemCount] / 2.0);
break;
}
case iCarouselTypeWheel:
case iCarouselTypeInvertedWheel:
{
//TODO: improve this
CGFloat count = [self circularCarouselItemCount];
CGFloat spacing = [self valueForOption:iCarouselOptionSpacing withDefault:1.0];
CGFloat arc = [self valueForOption:iCarouselOptionArc withDefault:M_PI * 2.0];
CGFloat radius = [self valueForOption:iCarouselOptionRadius withDefault:_itemWidth * spacing * count / arc];
if (radius - _itemWidth / 2.0 < MIN(self.bounds.size.width, self.bounds.size.height) / 2.0)
{