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GMGridView.m
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GMGridView.m
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//
// GMGridView.m
// GMGridView
//
// Created by Gulam Moledina on 11-10-09.
// Copyright (C) 2011 by Gulam Moledina.
//
// Latest code can be found on GitHub: https://github.com/gmoledina/GMGridView
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
#import <QuartzCore/QuartzCore.h>
#import "GMGridView.h"
#import "GMGridViewCell+Extended.h"
#import "GMGridViewLayoutStrategies.h"
#import "UIGestureRecognizer+GMGridViewAdditions.h"
static const NSInteger kTagOffset = 50;
static const CGFloat kDefaultAnimationDuration = 0.3;
static const UIViewAnimationOptions kDefaultAnimationOptions = UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionAllowUserInteraction;
//////////////////////////////////////////////////////////////
#pragma mark - Private interface
//////////////////////////////////////////////////////////////
@interface GMGridView () <UIGestureRecognizerDelegate, UIScrollViewDelegate>
{
// Sorting Gestures
UIPanGestureRecognizer *_sortingPanGesture;
UILongPressGestureRecognizer *_longPressGesture;
// Moving gestures
UIPinchGestureRecognizer *_pinchGesture;
UITapGestureRecognizer *_tapGesture;
UIRotationGestureRecognizer *_rotationGesture;
UIPanGestureRecognizer *_panGesture;
// General vars
NSInteger _numberTotalItems;
CGSize _itemSize;
NSMutableSet *_reusableCells;
// Moving (sorting) control vars
GMGridViewCell *_sortMovingItem;
NSInteger _sortFuturePosition;
BOOL _autoScrollActive;
CGPoint _minPossibleContentOffset;
CGPoint _maxPossibleContentOffset;
// Transforming control vars
GMGridViewCell *_transformingItem;
CGFloat _lastRotation;
CGFloat _lastScale;
BOOL _inFullSizeMode;
BOOL _inTransformingState;
// Rotation
BOOL _rotationActive;
}
@property (nonatomic, readonly) BOOL itemsSubviewsCacheIsValid;
@property (nonatomic, strong) NSArray *itemSubviewsCache;
@property (atomic) NSInteger firstPositionLoaded;
@property (atomic) NSInteger lastPositionLoaded;
- (void)commonInit;
// Gestures
- (void)sortingPanGestureUpdated:(UIPanGestureRecognizer *)panGesture;
- (void)longPressGestureUpdated:(UILongPressGestureRecognizer *)longPressGesture;
- (void)tapGestureUpdated:(UITapGestureRecognizer *)tapGesture;
- (void)panGestureUpdated:(UIPanGestureRecognizer *)panGesture;
- (void)pinchGestureUpdated:(UIPinchGestureRecognizer *)pinchGesture;
- (void)rotationGestureUpdated:(UIRotationGestureRecognizer *)rotationGesture;
// Sorting movement control
- (void)sortingMoveDidStartAtPoint:(CGPoint)point;
- (void)sortingMoveDidContinueToPoint:(CGPoint)point;
- (void)sortingMoveDidStopAtPoint:(CGPoint)point;
- (void)sortingAutoScrollMovementCheck;
// Transformation control
- (void)transformingGestureDidBeginWithGesture:(UIGestureRecognizer *)gesture;
- (void)transformingGestureDidFinish;
- (BOOL)isInTransformingState;
// Helpers & more
- (void)recomputeSizeAnimated:(BOOL)animated;
- (void)relayoutItemsAnimated:(BOOL)animated;
- (NSArray *)itemSubviews;
- (GMGridViewCell *)cellForItemAtIndex:(NSInteger)position;
- (GMGridViewCell *)newItemSubViewForPosition:(NSInteger)position;
- (NSInteger)positionForItemSubview:(GMGridViewCell *)view;
- (void)setSubviewsCacheAsInvalid;
- (CGRect)rectForPoint:(CGPoint)point inPaggingMode:(BOOL)pagging;
// Lazy loading
- (void)loadRequiredItems;
- (void)cleanupUnseenItems;
- (void)queueReusableCell:(GMGridViewCell *)cell;
// Memory warning
- (void)receivedMemoryWarningNotification:(NSNotification *)notification;
// Rotation handling
- (void)receivedWillRotateNotification:(NSNotification *)notification;
@end
//////////////////////////////////////////////////////////////
#pragma mark - Implementation
//////////////////////////////////////////////////////////////
@implementation GMGridView
@synthesize sortingDelegate = _sortingDelegate, dataSource = _dataSource, transformDelegate = _transformDelegate, actionDelegate = _actionDelegate;
@synthesize mainSuperView = _mainSuperView;
@synthesize layoutStrategy = _layoutStrategy;
@synthesize itemSpacing = _itemSpacing;
@synthesize style = _style;
@synthesize minimumPressDuration;
@synthesize centerGrid = _centerGrid;
@synthesize minEdgeInsets = _minEdgeInsets;
@synthesize showFullSizeViewWithAlphaWhenTransforming;
@synthesize editing = _editing;
@synthesize enableEditOnLongPress;
@synthesize disableEditOnEmptySpaceTap;
@synthesize itemsSubviewsCacheIsValid = _itemsSubviewsCacheIsValid;
@synthesize itemSubviewsCache;
@synthesize firstPositionLoaded = _firstPositionLoaded;
@synthesize lastPositionLoaded = _lastPositionLoaded;
//////////////////////////////////////////////////////////////
#pragma mark Constructors and destructor
//////////////////////////////////////////////////////////////
- (id)init
{
return [self initWithFrame:CGRectZero];
}
- (id)initWithFrame:(CGRect)frame
{
if ((self = [super initWithFrame:frame]))
{
[self commonInit];
}
return self;
}
- (id)initWithCoder:(NSCoder *)aDecoder
{
if ((self = [super initWithCoder:aDecoder]))
{
[self commonInit];
}
return self;
}
- (void)commonInit
{
_tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGestureUpdated:)];
_tapGesture.delegate = self;
_tapGesture.numberOfTapsRequired = 1;
_tapGesture.numberOfTouchesRequired = 1;
_tapGesture.cancelsTouchesInView = NO;
[self addGestureRecognizer:_tapGesture];
/////////////////////////////
// Transformation gestures :
_pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchGestureUpdated:)];
_pinchGesture.delegate = self;
[self addGestureRecognizer:_pinchGesture];
_rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationGestureUpdated:)];
_rotationGesture.delegate = self;
[self addGestureRecognizer:_rotationGesture];
_panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGestureUpdated:)];
_panGesture.delegate = self;
[_panGesture setMaximumNumberOfTouches:2];
[_panGesture setMinimumNumberOfTouches:2];
[self addGestureRecognizer:_panGesture];
//////////////////////
// Sorting gestures :
_sortingPanGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(sortingPanGestureUpdated:)];
_sortingPanGesture.delegate = self;
[self addGestureRecognizer:_sortingPanGesture];
_longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressGestureUpdated:)];
_longPressGesture.numberOfTouchesRequired = 1;
_longPressGesture.delegate = self;
_longPressGesture.cancelsTouchesInView = NO;
[self addGestureRecognizer:_longPressGesture];
////////////////////////
// Gesture dependencies
UIPanGestureRecognizer *panGestureRecognizer = nil;
if ([self respondsToSelector:@selector(panGestureRecognizer)]) // iOS5 only
{
panGestureRecognizer = self.panGestureRecognizer;
}
else
{
for (UIGestureRecognizer *gestureRecognizer in self.gestureRecognizers)
{
if ([gestureRecognizer isKindOfClass:NSClassFromString(@"UIScrollViewPanGestureRecognizer")])
{
panGestureRecognizer = (UIPanGestureRecognizer *) gestureRecognizer;
}
}
}
[panGestureRecognizer setMaximumNumberOfTouches:1];
[panGestureRecognizer requireGestureRecognizerToFail:_sortingPanGesture];
self.layoutStrategy = [GMGridViewLayoutStrategyFactory strategyFromType:GMGridViewLayoutVertical];
self.mainSuperView = self;
self.editing = NO;
self.itemSpacing = 10;
self.style = GMGridViewStyleSwap;
self.minimumPressDuration = 0.2;
self.showFullSizeViewWithAlphaWhenTransforming = YES;
self.minEdgeInsets = UIEdgeInsetsMake(5, 5, 5, 5);
self.clipsToBounds = NO;
_sortFuturePosition = GMGV_INVALID_POSITION;
_itemSize = CGSizeZero;
_centerGrid = YES;
_lastScale = 1.0;
_lastRotation = 0.0;
_minPossibleContentOffset = CGPointMake(0, 0);
_maxPossibleContentOffset = CGPointMake(0, 0);
_reusableCells = [[NSMutableSet alloc] init];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receivedMemoryWarningNotification:) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receivedWillRotateNotification:) name:UIApplicationWillChangeStatusBarOrientationNotification object:nil];
}
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationWillChangeStatusBarOrientationNotification object:nil];
}
//////////////////////////////////////////////////////////////
#pragma mark Layout
//////////////////////////////////////////////////////////////
- (void)applyWithoutAnimation:(void (^)(void))animations
{
if (animations)
{
[CATransaction begin];
[CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
animations();
[CATransaction commit];
}
}
- (void)layoutSubviewsWithAnimation:(GMGridViewItemAnimation)animation
{
[self recomputeSizeAnimated:!(animation & GMGridViewItemAnimationNone)];
[self relayoutItemsAnimated:animation & GMGridViewItemAnimationFade]; // only supported animation for now
[self loadRequiredItems];
}
- (void)layoutSubviews
{
[super layoutSubviews];
if (_rotationActive)
{
_rotationActive = NO;
// Updating all the items size
CGSize itemSize = [self.dataSource GMGridView:self sizeForItemsInInterfaceOrientation:[[UIApplication sharedApplication] statusBarOrientation]];
if (!CGSizeEqualToSize(_itemSize, itemSize))
{
_itemSize = itemSize;
[[self itemSubviews] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
if (obj != _transformingItem)
{
GMGridViewCell *cell = (GMGridViewCell *)obj;
cell.bounds = CGRectMake(0, 0, _itemSize.width, _itemSize.height);
cell.contentView.frame = cell.bounds;
}
}];
}
// Updating the fullview size
if (_transformingItem && _inFullSizeMode)
{
NSInteger position = _transformingItem.tag - kTagOffset;
CGSize fullSize = [self.transformDelegate GMGridView:self sizeInFullSizeForCell:_transformingItem atIndex:position inInterfaceOrientation:[[UIApplication sharedApplication] statusBarOrientation]];
if (!CGSizeEqualToSize(fullSize, _transformingItem.fullSize))
{
CGPoint center = _transformingItem.fullSizeView.center;
_transformingItem.fullSize = fullSize;
_transformingItem.fullSizeView.center = center;
}
}
// Adding alpha animation to make the relayouting more smooth
CATransition *transition = [CATransition animation];
transition.duration = 0.25f;
transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
transition.type = kCATransitionFade;
[self.layer addAnimation:transition forKey:@"rotationAnimation"];
[self applyWithoutAnimation:^{
[self layoutSubviewsWithAnimation:GMGridViewItemAnimationNone];
}];
// Fixing the contentOffset when pagging enabled
if (self.pagingEnabled)
{
[self setContentOffset:[self rectForPoint:self.contentOffset inPaggingMode:YES].origin animated:YES];
}
}
else
{
[self layoutSubviewsWithAnimation:GMGridViewItemAnimationNone];
}
}
//////////////////////////////////////////////////////////////
#pragma mark Orientation and memory management
//////////////////////////////////////////////////////////////
- (void)receivedMemoryWarningNotification:(NSNotification *)notification
{
[self cleanupUnseenItems];
[_reusableCells removeAllObjects];
}
- (void)receivedWillRotateNotification:(NSNotification *)notification
{
_rotationActive = YES;
}
//////////////////////////////////////////////////////////////
#pragma mark Setters / getters
//////////////////////////////////////////////////////////////
- (void)setDataSource:(NSObject<GMGridViewDataSource> *)dataSource
{
_dataSource = dataSource;
[self reloadData];
}
- (void)setMainSuperView:(UIView *)mainSuperView
{
_mainSuperView = mainSuperView != nil ? mainSuperView : self;
}
- (void)setLayoutStrategy:(id<GMGridViewLayoutStrategy>)layoutStrategy
{
_layoutStrategy = layoutStrategy;
self.pagingEnabled = [[self.layoutStrategy class] requiresEnablingPaging];
[self setNeedsLayout];
}
- (void)setItemSpacing:(NSInteger)itemSpacing
{
_itemSpacing = itemSpacing;
[self setNeedsLayout];
}
- (void)setCenterGrid:(BOOL)centerGrid
{
_centerGrid = centerGrid;
[self setNeedsLayout];
}
- (void)setMinEdgeInsets:(UIEdgeInsets)minEdgeInsets
{
_minEdgeInsets = minEdgeInsets;
[self setNeedsLayout];
}
- (void)setMinimumPressDuration:(CFTimeInterval)duration
{
_longPressGesture.minimumPressDuration = duration;
}
- (CFTimeInterval)minimumPressDuration
{
return _longPressGesture.minimumPressDuration;
}
- (void)setEditing:(BOOL)editing
{
[self setEditing:editing animated:NO];
if ([self.actionDelegate respondsToSelector:@selector(GMGridView:changedEdit:)]) {
[self.actionDelegate GMGridView:self changedEdit:editing];
}
}
- (void)setEditing:(BOOL)editing animated:(BOOL)animated
{
if ([self.actionDelegate respondsToSelector:@selector(GMGridView:processDeleteActionForItemAtIndex:)]
&&![self isInTransformingState]
&& ((self.isEditing && !editing) || (!self.isEditing && editing)))
{
for (GMGridViewCell *cell in [self itemSubviews])
{
NSInteger index = [self positionForItemSubview:cell];
if (index != GMGV_INVALID_POSITION)
{
BOOL allowEdit = editing && [self.dataSource GMGridView:self canDeleteItemAtIndex:index];
[cell setEditing:allowEdit animated:animated];
}
}
_editing = editing;
}
}
//////////////////////////////////////////////////////////////
#pragma mark UIScrollView delegate replacement
//////////////////////////////////////////////////////////////
- (void)contentOffset:(CGPoint)contentOffset
{
BOOL valueChanged = !CGPointEqualToPoint(contentOffset, self.contentOffset);
[super setContentOffset:contentOffset];
if (valueChanged)
{
[self loadRequiredItems];
}
}
//////////////////////////////////////////////////////////////
#pragma mark GestureRecognizer delegate
//////////////////////////////////////////////////////////////
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
return YES;
}
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
BOOL valid = YES;
BOOL isScrolling = self.isDragging || self.isDecelerating;
if (gestureRecognizer == _tapGesture)
{
if (self.editing && self.disableEditOnEmptySpaceTap) {
CGPoint locationTouch = [_tapGesture locationInView:self];
NSInteger position = [self.layoutStrategy itemPositionFromLocation:locationTouch];
valid = (position == GMGV_INVALID_POSITION);
} else {
valid = !isScrolling && !self.isEditing && ![_longPressGesture hasRecognizedValidGesture];
}
}
else if (gestureRecognizer == _longPressGesture)
{
valid = (self.sortingDelegate || self.enableEditOnLongPress) && !isScrolling && !self.isEditing;
}
else if (gestureRecognizer == _sortingPanGesture)
{
valid = (_sortMovingItem != nil && [_longPressGesture hasRecognizedValidGesture]);
}
else if(gestureRecognizer == _rotationGesture || gestureRecognizer == _pinchGesture || gestureRecognizer == _panGesture)
{
if (self.transformDelegate != nil && [gestureRecognizer numberOfTouches] == 2)
{
CGPoint locationTouch1 = [gestureRecognizer locationOfTouch:0 inView:self];
CGPoint locationTouch2 = [gestureRecognizer locationOfTouch:1 inView:self];
NSInteger positionTouch1 = [self.layoutStrategy itemPositionFromLocation:locationTouch1];
NSInteger positionTouch2 = [self.layoutStrategy itemPositionFromLocation:locationTouch2];
valid = !self.isEditing && ([self isInTransformingState] || ((positionTouch1 == positionTouch2) && (positionTouch1 != GMGV_INVALID_POSITION)));
}
else
{
valid = NO;
}
}
return valid;
}
//////////////////////////////////////////////////////////////
#pragma mark Sorting gestures & logic
//////////////////////////////////////////////////////////////
- (void)longPressGestureUpdated:(UILongPressGestureRecognizer *)longPressGesture
{
if (self.enableEditOnLongPress && !self.editing) {
CGPoint locationTouch = [longPressGesture locationInView:self];
NSInteger position = [self.layoutStrategy itemPositionFromLocation:locationTouch];
if (position != GMGV_INVALID_POSITION)
{
if (!self.editing) {
self.editing = YES;
}
}
return;
}
switch (longPressGesture.state)
{
case UIGestureRecognizerStateBegan:
{
if (!_sortMovingItem)
{
CGPoint location = [longPressGesture locationInView:self];
NSInteger position = [self.layoutStrategy itemPositionFromLocation:location];
if (position != GMGV_INVALID_POSITION)
{
[self sortingMoveDidStartAtPoint:location];
}
}
break;
}
case UIGestureRecognizerStateEnded:
case UIGestureRecognizerStateCancelled:
case UIGestureRecognizerStateFailed:
{
[_sortingPanGesture end];
if (_sortMovingItem)
{
CGPoint location = [longPressGesture locationInView:self];
[self sortingMoveDidStopAtPoint:location];
}
break;
}
default:
break;
}
}
- (void)sortingPanGestureUpdated:(UIPanGestureRecognizer *)panGesture
{
switch (panGesture.state)
{
case UIGestureRecognizerStateEnded:
case UIGestureRecognizerStateCancelled:
case UIGestureRecognizerStateFailed:
{
_autoScrollActive = NO;
break;
}
case UIGestureRecognizerStateBegan:
{
_autoScrollActive = YES;
[self sortingAutoScrollMovementCheck];
break;
}
case UIGestureRecognizerStateChanged:
{
CGPoint translation = [panGesture translationInView:self];
CGPoint offset = translation;
CGPoint locationInScroll = [panGesture locationInView:self];
_sortMovingItem.transform = CGAffineTransformMakeTranslation(offset.x, offset.y);
[self sortingMoveDidContinueToPoint:locationInScroll];
break;
}
default:
break;
}
}
- (void)sortingAutoScrollMovementCheck
{
if (_sortMovingItem && _autoScrollActive)
{
CGPoint locationInMainView = [_sortingPanGesture locationInView:self];
locationInMainView = CGPointMake(locationInMainView.x - self.contentOffset.x,
locationInMainView.y -self.contentOffset.y
);
CGFloat threshhold = _itemSize.height;
CGPoint offset = self.contentOffset;
CGPoint locationInScroll = [_sortingPanGesture locationInView:self];
// Going down
if (locationInMainView.x + threshhold > self.bounds.size.width)
{
offset.x += _itemSize.width / 2;
if (offset.x > _maxPossibleContentOffset.x)
{
offset.x = _maxPossibleContentOffset.x;
}
}
// Going up
else if (locationInMainView.x - threshhold <= 0)
{
offset.x -= _itemSize.width / 2;
if (offset.x < _minPossibleContentOffset.x)
{
offset.x = _minPossibleContentOffset.x;
}
}
// Going right
if (locationInMainView.y + threshhold > self.bounds.size.height)
{
offset.y += _itemSize.height / 2;
if (offset.y > _maxPossibleContentOffset.y)
{
offset.y = _maxPossibleContentOffset.y;
}
}
// Going left
else if (locationInMainView.y - threshhold <= 0)
{
offset.y -= _itemSize.height / 2;
if (offset.y < _minPossibleContentOffset.y)
{
offset.y = _minPossibleContentOffset.y;
}
}
if (offset.x != self.contentOffset.x || offset.y != self.contentOffset.y)
{
[UIView animateWithDuration:kDefaultAnimationDuration
delay:0
options:kDefaultAnimationOptions
animations:^{
self.contentOffset = offset;
}
completion:^(BOOL finished){
self.contentOffset = offset;
if (_autoScrollActive)
{
[self sortingMoveDidContinueToPoint:locationInScroll];
}
[self sortingAutoScrollMovementCheck];
}
];
}
else
{
[self performSelector:@selector(sortingAutoScrollMovementCheck) withObject:nil afterDelay:0.5];
}
}
}
- (void)sortingMoveDidStartAtPoint:(CGPoint)point
{
NSInteger position = [self.layoutStrategy itemPositionFromLocation:point];
GMGridViewCell *item = [self cellForItemAtIndex:position];
[self bringSubviewToFront:item];
_sortMovingItem = item;
CGRect frameInMainView = [self convertRect:_sortMovingItem.frame toView:self.mainSuperView];
[_sortMovingItem removeFromSuperview];
_sortMovingItem.frame = frameInMainView;
[self.mainSuperView addSubview:_sortMovingItem];
_sortFuturePosition = _sortMovingItem.tag - kTagOffset;
_sortMovingItem.tag = 0;
if ([self.sortingDelegate respondsToSelector:@selector(GMGridView:didStartMovingCell:)])
{
[self.sortingDelegate GMGridView:self didStartMovingCell:_sortMovingItem];
}
if ([self.sortingDelegate respondsToSelector:@selector(GMGridView:shouldAllowShakingBehaviorWhenMovingCell:atIndex:)])
{
[_sortMovingItem shake:[self.sortingDelegate GMGridView:self shouldAllowShakingBehaviorWhenMovingCell:_sortMovingItem atIndex:position]];
}
else
{
[_sortMovingItem shake:YES];
}
}
- (void)sortingMoveDidStopAtPoint:(CGPoint)point
{
[_sortMovingItem shake:NO];
_sortMovingItem.tag = _sortFuturePosition + kTagOffset;
CGRect frameInScroll = [self.mainSuperView convertRect:_sortMovingItem.frame toView:self];
[_sortMovingItem removeFromSuperview];
_sortMovingItem.frame = frameInScroll;
[self addSubview:_sortMovingItem];
CGPoint newOrigin = [self.layoutStrategy originForItemAtPosition:_sortFuturePosition];
CGRect newFrame = CGRectMake(newOrigin.x, newOrigin.y, _itemSize.width, _itemSize.height);
[UIView animateWithDuration:kDefaultAnimationDuration
delay:0
options:0
animations:^{
_sortMovingItem.transform = CGAffineTransformIdentity;
_sortMovingItem.frame = newFrame;
}
completion:^(BOOL finished){
if ([self.sortingDelegate respondsToSelector:@selector(GMGridView:didEndMovingCell:)])
{
[self.sortingDelegate GMGridView:self didEndMovingCell:_sortMovingItem];
}
_sortMovingItem = nil;
_sortFuturePosition = GMGV_INVALID_POSITION;
[self setSubviewsCacheAsInvalid];
}
];
}
- (void)sortingMoveDidContinueToPoint:(CGPoint)point
{
int position = [self.layoutStrategy itemPositionFromLocation:point];
int tag = position + kTagOffset;
if (position != GMGV_INVALID_POSITION && position != _sortFuturePosition && position < _numberTotalItems)
{
BOOL positionTaken = NO;
for (UIView *v in [self itemSubviews])
{
if (v != _sortMovingItem && v.tag == tag)
{
positionTaken = YES;
break;
}
}
if (positionTaken)
{
switch (self.style)
{
case GMGridViewStylePush:
{
if (position > _sortFuturePosition)
{
for (UIView *v in [self itemSubviews])
{
if ((v.tag == tag || (v.tag < tag && v.tag >= _sortFuturePosition + kTagOffset)) && v != _sortMovingItem )
{
v.tag = v.tag - 1;
[self sendSubviewToBack:v];
}
}
}
else
{
for (UIView *v in [self itemSubviews])
{
if ((v.tag == tag || (v.tag > tag && v.tag <= _sortFuturePosition + kTagOffset)) && v != _sortMovingItem)
{
v.tag = v.tag + 1;
[self sendSubviewToBack:v];
}
}
}
[self.sortingDelegate GMGridView:self moveItemAtIndex:_sortFuturePosition toIndex:position];
[self relayoutItemsAnimated:YES];
break;
}
case GMGridViewStyleSwap:
default:
{
if (_sortMovingItem)
{
UIView *v = [self cellForItemAtIndex:position];
v.tag = _sortFuturePosition + kTagOffset;
CGPoint origin = [self.layoutStrategy originForItemAtPosition:_sortFuturePosition];
[UIView animateWithDuration:kDefaultAnimationDuration
delay:0
options:kDefaultAnimationOptions
animations:^{
v.frame = CGRectMake(origin.x, origin.y, _itemSize.width, _itemSize.height);
}
completion:nil
];
}
[self.sortingDelegate GMGridView:self exchangeItemAtIndex:_sortFuturePosition withItemAtIndex:position];
break;
}
}
}
_sortFuturePosition = position;
}
}
//////////////////////////////////////////////////////////////
#pragma mark Transformation gestures & logic
//////////////////////////////////////////////////////////////
- (void)panGestureUpdated:(UIPanGestureRecognizer *)panGesture
{
switch (panGesture.state)
{
case UIGestureRecognizerStateEnded:
case UIGestureRecognizerStateCancelled:
case UIGestureRecognizerStateFailed:
{
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(transformingGestureDidFinish) object:nil];
[self performSelector:@selector(transformingGestureDidFinish) withObject:nil afterDelay:0.1];
self.scrollEnabled = YES;
break;
}
case UIGestureRecognizerStateBegan:
{
[self transformingGestureDidBeginWithGesture:panGesture];
self.scrollEnabled = NO;
break;
}
case UIGestureRecognizerStateChanged:
{
if (panGesture.numberOfTouches != 2)
{
[panGesture end];
}
CGPoint translate = [panGesture translationInView:self];
[_transformingItem.contentView setCenter:CGPointMake(_transformingItem.contentView.center.x + translate.x, _transformingItem.contentView.center.y + translate.y)];
[panGesture setTranslation:CGPointZero inView:self];
break;
}
default:
{
}
}
}
- (void)pinchGestureUpdated:(UIPinchGestureRecognizer *)pinchGesture
{
switch (pinchGesture.state)
{
case UIGestureRecognizerStateEnded:
case UIGestureRecognizerStateCancelled:
case UIGestureRecognizerStateFailed:
{
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(transformingGestureDidFinish) object:nil];
[self performSelector:@selector(transformingGestureDidFinish) withObject:nil afterDelay:0.1];
break;
}
case UIGestureRecognizerStateBegan:
{
[self transformingGestureDidBeginWithGesture:pinchGesture];
}
case UIGestureRecognizerStateChanged:
{
CGFloat currentScale = [[_transformingItem.contentView.layer valueForKeyPath:@"transform.scale"] floatValue];
CGFloat scale = 1 - (_lastScale - [_pinchGesture scale]);
//todo: compute these scale factors dynamically based on ratio of thumbnail/fullscreen sizes
const CGFloat kMaxScale = 3;
const CGFloat kMinScale = 0.5;
scale = MIN(scale, kMaxScale / currentScale);
scale = MAX(scale, kMinScale / currentScale);
if (scale >= kMinScale && scale <= kMaxScale)
{
CGAffineTransform currentTransform = [_transformingItem.contentView transform];
CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale);
_transformingItem.contentView.transform = newTransform;
_lastScale = [_pinchGesture scale];
currentScale += scale;
CGFloat alpha = 1 - (kMaxScale - currentScale);
alpha = MAX(0, alpha);
alpha = MIN(1, alpha);
if (self.showFullSizeViewWithAlphaWhenTransforming && currentScale >= 1.5)
{
[_transformingItem stepToFullsizeWithAlpha:alpha];
}
_transformingItem.backgroundColor = [[UIColor darkGrayColor] colorWithAlphaComponent:MIN(alpha, 0.9)];
}
break;
}
default:
{
}
}
}
- (void)rotationGestureUpdated:(UIRotationGestureRecognizer *)rotationGesture
{
switch (rotationGesture.state)
{
case UIGestureRecognizerStateEnded:
case UIGestureRecognizerStateCancelled:
case UIGestureRecognizerStateFailed:
{
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(transformingGestureDidFinish) object:nil];
[self performSelector:@selector(transformingGestureDidFinish) withObject:nil afterDelay:0.1];
break;
}
case UIGestureRecognizerStateBegan:
{
[self transformingGestureDidBeginWithGesture:rotationGesture];
break;
}
case UIGestureRecognizerStateChanged:
{
CGFloat rotation = [rotationGesture rotation] - _lastRotation;
CGAffineTransform currentTransform = [_transformingItem.contentView transform];
CGAffineTransform newTransform = CGAffineTransformRotate(currentTransform, rotation);
_transformingItem.contentView.transform = newTransform;
_lastRotation = [rotationGesture rotation];
break;
}
default:
{
}
}
}
- (void)transformingGestureDidBeginWithGesture:(UIGestureRecognizer *)gesture
{
_inFullSizeMode = NO;
if (_inTransformingState && [gesture isKindOfClass:[UIPinchGestureRecognizer class]])
{