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Build ChatListUI
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Ali
498
submodules/LegacyComponents/Sources/TGDraggableCollectionView.m
Normal file
498
submodules/LegacyComponents/Sources/TGDraggableCollectionView.m
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@@ -0,0 +1,498 @@
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#import "TGDraggableCollectionView.h"
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#import <LegacyComponents/LegacyComponents.h>
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#import "TGDraggableCollectionViewFlowLayout.h"
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NSString * const TGDraggableCollectionViewLayoutKey = @"collectionViewLayout";
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const UIEdgeInsets TGDraggableDefaultScrollingTriggerEdgeInsets = { 60, 60, 60, 60 };
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const CGFloat TGDraggableDefaultScrollingSpeed = 300.0f;
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typedef enum
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{
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TGDraggableCollectionScrollingDirectionUnknown,
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TGDraggableCollectionScrollingDirectionUp,
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TGDraggableCollectionScrollingDirectionLeft,
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TGDraggableCollectionScrollingDirectionRight,
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TGDraggableCollectionScrollingDirectionDown
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} TGDraggableCollectionScrollingDirection;
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@interface TGDraggableCollectionView () <UIGestureRecognizerDelegate>
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{
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UIView *_draggedView;
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UIView *_insideSnapshotView;
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UIView *_outsideSnapshotView;
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NSIndexPath *_lastIndexPath;
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UIPanGestureRecognizer *_panGestureRecognizer;
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UILongPressGestureRecognizer *_pressGestureRecognizer;
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CADisplayLink *_scrollingDisplayLink;
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TGDraggableCollectionScrollingDirection _scrollingDirection;
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}
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@end
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@implementation TGDraggableCollectionView
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- (instancetype)initWithFrame:(CGRect)frame collectionViewLayout:(UICollectionViewLayout *)layout
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{
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NSAssert([layout isKindOfClass:[TGDraggableCollectionViewFlowLayout class]], @"collectionViewLayout must be an instance of TGDraggableCollectionViewFlowLayout");
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self = [super initWithFrame:frame collectionViewLayout:layout];
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if (self != nil)
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{
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_scrollingTriggerEdgeInsets = TGDraggableDefaultScrollingTriggerEdgeInsets;
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_scrollingSpeed = TGDraggableDefaultScrollingSpeed;
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_panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleDragPan:)];
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_panGestureRecognizer.delegate = self;
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[self addGestureRecognizer:_panGestureRecognizer];
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_pressGestureRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleDragPress:)];
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_pressGestureRecognizer.minimumPressDuration = 0.25f;
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_pressGestureRecognizer.delegate = self;
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for (UIGestureRecognizer *gestureRecognizer in self.gestureRecognizers)
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{
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if ([gestureRecognizer isKindOfClass:[UILongPressGestureRecognizer class]])
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[gestureRecognizer requireGestureRecognizerToFail:_pressGestureRecognizer];
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}
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[self addGestureRecognizer:_pressGestureRecognizer];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(handleApplicationWillResignActive:)
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name:UIApplicationWillResignActiveNotification
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object:nil];
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}
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return self;
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}
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- (void)dealloc
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{
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[[NSNotificationCenter defaultCenter] removeObserver:self
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name:UIApplicationWillResignActiveNotification
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object:nil];
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}
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- (void)handleApplicationWillResignActive:(NSNotification *)__unused notification
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{
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_pressGestureRecognizer.enabled = false;
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_pressGestureRecognizer.enabled = true;
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}
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- (void)setDraggable:(bool)draggable
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{
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_draggable = draggable;
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_pressGestureRecognizer.enabled = draggable;
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_panGestureRecognizer.enabled = draggable;
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}
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#pragma mark - Items
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- (TGDraggableCollectionViewFlowLayout *)draggableLayout
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{
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return (TGDraggableCollectionViewFlowLayout *)self.draggableLayout;
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}
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- (NSIndexPath *)indexPathForItemNearPoint:(CGPoint)point
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{
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NSIndexPath *destinationIndexPath = self.draggableLayout.destinationIndexPath;
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self.draggableLayout.destinationIndexPath = nil;
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NSArray *layoutAttributes = [self.draggableLayout layoutAttributesForElementsInRect:self.bounds];
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self.draggableLayout.destinationIndexPath = destinationIndexPath;
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NSIndexPath *nearestItemIndexPath = nil;
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CGFloat minDistance = FLT_MAX;
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for (UICollectionViewLayoutAttributes *attributes in layoutAttributes)
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{
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CGFloat deltaX = attributes.center.x - point.x;
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CGFloat deltaY = attributes.center.y - point.y;
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CGFloat distance = (CGFloat)sqrt(deltaX * deltaX + deltaY * deltaY);
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if (distance < minDistance)
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{
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minDistance = distance;
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nearestItemIndexPath = attributes.indexPath;
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}
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}
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return nearestItemIndexPath;
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}
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#pragma mark - Dragged View
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- (UIView *)_draggedViewSuperview
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{
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return (self.draggedViewSuperview != nil) ? self.draggedViewSuperview : self;
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}
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- (UIView *)_prepareDraggedViewForCell:(UICollectionViewCell *)cell
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{
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UIView *view = [[UIView alloc] initWithFrame:[self convertRect:cell.frame toView:[self _draggedViewSuperview]]];
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view.layer.rasterizationScale = TGScreenScaling();
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_outsideSnapshotView = [cell snapshotViewAfterScreenUpdates:false];
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[view addSubview:_outsideSnapshotView];
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_insideSnapshotView = [cell snapshotViewAfterScreenUpdates:false];
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_outsideSnapshotView.layer.shadowOffset = CGSizeZero;
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_outsideSnapshotView.layer.shadowColor = [UIColor blackColor].CGColor;
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_outsideSnapshotView.layer.shadowRadius = 3.0f;
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_outsideSnapshotView.layer.shadowOpacity = 0.87f;
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_outsideSnapshotView.layer.shadowPath = [UIBezierPath bezierPathWithRect:view.bounds].CGPath;
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return view;
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}
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- (void)_performDraggedViewHighlightTransitionWithDuration:(CGFloat)duration completion:(void (^)(void))completion
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{
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[self addSubview:_insideSnapshotView];
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_insideSnapshotView.center = [self convertPoint:_draggedView.center fromView:[self _draggedViewSuperview]];
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_draggedView.layer.shouldRasterize = true;
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_draggedView.alpha = 0.0f;
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[UIView animateWithDuration:duration delay:0.0f options:UIViewAnimationOptionBeginFromCurrentState animations:^
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{
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_draggedView.alpha = 1.0f;
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_draggedView.transform = CGAffineTransformMakeScale(1.12f, 1.12f);
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_insideSnapshotView.transform = _draggedView.transform;
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} completion:^(BOOL finished)
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{
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if (finished)
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{
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_insideSnapshotView.hidden = true;
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if (completion != nil)
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completion();
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}
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}];
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}
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- (void)_performDraggedViewUnhighlightTransitionWithDuration:(CGFloat)duration targetCellCenter:(CGPoint)targetCellCenter completion:(void (^)(void))completion
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{
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_insideSnapshotView.center = [self convertPoint:_draggedView.center fromView:[self _draggedViewSuperview]];
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_insideSnapshotView.hidden = false;
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[UIView animateWithDuration:duration delay:0.0f options:UIViewAnimationOptionBeginFromCurrentState animations:^
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{
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_draggedView.alpha = 0.0f;
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_draggedView.transform = CGAffineTransformIdentity;
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_insideSnapshotView.transform = _draggedView.transform;
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_draggedView.center = [self convertPoint:targetCellCenter toView:[self _draggedViewSuperview]];
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_insideSnapshotView.center = targetCellCenter;
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} completion:^(__unused BOOL finished)
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{
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if (completion != nil)
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completion();
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}];
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}
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- (void)_performDraggedViewDropToIndexPath:(NSIndexPath *)destinationIndexPath completion:(void (^)(void))completion
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{
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UICollectionViewLayoutAttributes *layoutAttributes = [self layoutAttributesForItemAtIndexPath:destinationIndexPath];
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[self _performDraggedViewUnhighlightTransitionWithDuration:0.25f targetCellCenter:layoutAttributes.center completion:^
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{
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[_draggedView removeFromSuperview];
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_draggedView = nil;
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[_outsideSnapshotView removeFromSuperview];
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_outsideSnapshotView = nil;
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[_insideSnapshotView removeFromSuperview];
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_insideSnapshotView = nil;
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if (completion != nil)
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completion();
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}];
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}
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- (void)updateDestinationIndexPath:(NSIndexPath *)indexPath
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{
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if (indexPath == nil || [_lastIndexPath isEqual:indexPath])
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return;
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_lastIndexPath = indexPath;
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id<TGDraggableCollectionViewDataSource> dataSource = (id<TGDraggableCollectionViewDataSource>)self.dataSource;
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if ([dataSource respondsToSelector:@selector(collectionView:canMoveItemAtIndexPath:toIndexPath:)] &&
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![dataSource collectionView:self canMoveItemAtIndexPath:self.draggableLayout.sourceIndexPath toIndexPath:indexPath])
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{
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return;
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}
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[self performBatchUpdates:^
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{
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self.draggableLayout.hiddenIndexPath = indexPath;
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self.draggableLayout.destinationIndexPath = indexPath;
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} completion:nil];
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}
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#pragma mark - Gesture Handling
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- (void)handleDragPress:(UILongPressGestureRecognizer *)gestureRecognizer
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{
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switch (gestureRecognizer.state)
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{
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case UIGestureRecognizerStateBegan:
|
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{
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CGPoint location = [gestureRecognizer locationInView:self];
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NSIndexPath *indexPath = [self indexPathForItemAtPoint:location];
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if (indexPath == nil)
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return;
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id<TGDraggableCollectionViewDataSource> dataSource = (id<TGDraggableCollectionViewDataSource>)self.dataSource;
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if ([dataSource respondsToSelector:@selector(collectionView:canMoveItemAtIndexPath:)] &&
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![dataSource collectionView:self canMoveItemAtIndexPath:indexPath])
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{
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return;
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}
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[_draggedView removeFromSuperview];
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_draggedView = [self _prepareDraggedViewForCell:[self cellForItemAtIndexPath:indexPath]];
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[[self _draggedViewSuperview] addSubview:_draggedView];
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[self _performDraggedViewHighlightTransitionWithDuration:0.25f completion:nil];
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_lastIndexPath = indexPath;
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self.draggableLayout.sourceIndexPath = indexPath;
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self.draggableLayout.destinationIndexPath = indexPath;
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self.draggableLayout.hiddenIndexPath = indexPath;
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[self.draggableLayout invalidateLayout];
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}
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break;
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case UIGestureRecognizerStateEnded:
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case UIGestureRecognizerStateCancelled:
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{
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if (self.draggableLayout.sourceIndexPath == nil)
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return;
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NSIndexPath *sourceIndexPath = self.draggableLayout.sourceIndexPath;
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NSIndexPath *destinationIndexPath = self.draggableLayout.destinationIndexPath;
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id<TGDraggableCollectionViewDataSource> dataSource = (id<TGDraggableCollectionViewDataSource>)self.dataSource;
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[dataSource collectionView:self itemAtIndexPath:sourceIndexPath willMoveToIndexPath:destinationIndexPath];
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[self performBatchUpdates:^
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{
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[self moveItemAtIndexPath:sourceIndexPath toIndexPath:destinationIndexPath];
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self.draggableLayout.sourceIndexPath = nil;
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self.draggableLayout.destinationIndexPath = nil;
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} completion:nil];
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_pressGestureRecognizer.enabled = false;
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[self _performDraggedViewDropToIndexPath:destinationIndexPath completion:^
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{
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_pressGestureRecognizer.enabled = true;
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if ([dataSource respondsToSelector:@selector(collectionView:itemAtIndexPath:didMoveToIndexPath:)])
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[dataSource collectionView:self itemAtIndexPath:sourceIndexPath didMoveToIndexPath:destinationIndexPath];
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self.draggableLayout.hiddenIndexPath = nil;
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[self.draggableLayout invalidateLayout];
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}];
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_lastIndexPath = nil;
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[self invalidateScrolling];
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}
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break;
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||||
|
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default:
|
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break;
|
||||
}
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}
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- (void)handleDragPan:(UIPanGestureRecognizer *)gestureRecognizer
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{
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if (self.draggableLayout.sourceIndexPath == nil)
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return;
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|
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switch (gestureRecognizer.state)
|
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{
|
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case UIGestureRecognizerStateBegan:
|
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case UIGestureRecognizerStateChanged:
|
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{
|
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CGPoint translation = [gestureRecognizer translationInView:self];
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[gestureRecognizer setTranslation:CGPointZero inView:self];
|
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_draggedView.center = CGPointMake(_draggedView.center.x + translation.x,
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_draggedView.center.y + translation.y);
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CGPoint center = [self convertPoint:_draggedView.center fromView:[self _draggedViewSuperview]];
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_insideSnapshotView.center = center;
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|
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UICollectionViewFlowLayout *layout = (UICollectionViewFlowLayout *)self.draggableLayout;
|
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switch (layout.scrollDirection)
|
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{
|
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case UICollectionViewScrollDirectionHorizontal:
|
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{
|
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if (center.x < (CGRectGetMinX(self.bounds) + self.scrollingTriggerEdgeInsets.left))
|
||||
{
|
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[self setupScrollForDraggingInDirection:TGDraggableCollectionScrollingDirectionLeft];
|
||||
}
|
||||
else
|
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{
|
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if (center.x > (CGRectGetMaxX(self.bounds) - self.scrollingTriggerEdgeInsets.right))
|
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[self setupScrollForDraggingInDirection:TGDraggableCollectionScrollingDirectionRight];
|
||||
else
|
||||
[self invalidateScrolling];
|
||||
}
|
||||
}
|
||||
break;
|
||||
|
||||
case UICollectionViewScrollDirectionVertical:
|
||||
{
|
||||
if (center.y < (CGRectGetMinY(self.bounds) + self.scrollingTriggerEdgeInsets.top))
|
||||
{
|
||||
[self setupScrollForDraggingInDirection:TGDraggableCollectionScrollingDirectionUp];
|
||||
}
|
||||
else
|
||||
{
|
||||
if (center.y > (CGRectGetMaxY(self.bounds) - self.scrollingTriggerEdgeInsets.bottom))
|
||||
[self setupScrollForDraggingInDirection:TGDraggableCollectionScrollingDirectionDown];
|
||||
else
|
||||
[self invalidateScrolling];
|
||||
}
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
break;
|
||||
|
||||
case UIGestureRecognizerStateEnded:
|
||||
case UIGestureRecognizerStateCancelled:
|
||||
{
|
||||
[self invalidateScrolling];
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
if (_scrollingDirection != TGDraggableCollectionScrollingDirectionUnknown)
|
||||
return;
|
||||
|
||||
CGPoint location = [gestureRecognizer locationInView:self];
|
||||
NSIndexPath *indexPath = [self indexPathForItemNearPoint:location];
|
||||
[self updateDestinationIndexPath:indexPath];
|
||||
}
|
||||
|
||||
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
|
||||
{
|
||||
if (self.draggable && gestureRecognizer == _panGestureRecognizer)
|
||||
return (self.draggableLayout.sourceIndexPath != nil);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
|
||||
{
|
||||
if (gestureRecognizer == _pressGestureRecognizer && otherGestureRecognizer == _panGestureRecognizer)
|
||||
return true;
|
||||
else if (gestureRecognizer == _panGestureRecognizer && otherGestureRecognizer == _pressGestureRecognizer)
|
||||
return true;
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
#pragma mark - Scrolling
|
||||
|
||||
- (void)setupScrollForDraggingInDirection:(TGDraggableCollectionScrollingDirection)direction
|
||||
{
|
||||
if (_scrollingDirection == direction)
|
||||
return;
|
||||
|
||||
[self invalidateScrolling];
|
||||
|
||||
_scrollingDirection = direction;
|
||||
|
||||
_scrollingDisplayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(handleDragScroll:)];
|
||||
[_scrollingDisplayLink addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
|
||||
}
|
||||
|
||||
- (void)handleDragScroll:(CADisplayLink *)displayLink
|
||||
{
|
||||
if (_scrollingDirection == TGDraggableCollectionScrollingDirectionUnknown)
|
||||
return;
|
||||
|
||||
CGSize frameSize = self.bounds.size;
|
||||
CGSize contentSize = self.contentSize;
|
||||
CGPoint contentOffset = self.contentOffset;
|
||||
UIEdgeInsets contentInset = self.contentInset;
|
||||
|
||||
CGFloat distance = (CGFloat)rint(self.scrollingSpeed * displayLink.duration);
|
||||
CGPoint translation = CGPointZero;
|
||||
|
||||
switch (_scrollingDirection)
|
||||
{
|
||||
case TGDraggableCollectionScrollingDirectionUp:
|
||||
{
|
||||
distance = -distance;
|
||||
|
||||
if (contentOffset.y + distance <= -contentInset.top)
|
||||
distance = -contentOffset.y - contentInset.top;
|
||||
|
||||
translation = CGPointMake(0, distance);
|
||||
}
|
||||
break;
|
||||
|
||||
case TGDraggableCollectionScrollingDirectionDown:
|
||||
{
|
||||
CGFloat maxY = contentSize.height - frameSize.height + contentInset.bottom;
|
||||
|
||||
if ((contentOffset.y + distance) >= maxY)
|
||||
distance = maxY - contentOffset.y;
|
||||
|
||||
translation = CGPointMake(0, distance);
|
||||
}
|
||||
break;
|
||||
|
||||
case TGDraggableCollectionScrollingDirectionLeft:
|
||||
{
|
||||
distance = -distance;
|
||||
|
||||
if (contentOffset.x + distance <= -contentInset.left)
|
||||
distance = -contentOffset.x - contentInset.left;
|
||||
|
||||
translation = CGPointMake(distance, 0);
|
||||
}
|
||||
break;
|
||||
|
||||
case TGDraggableCollectionScrollingDirectionRight:
|
||||
{
|
||||
CGFloat maxX = contentSize.width - frameSize.width + contentInset.right;
|
||||
|
||||
if ((contentOffset.x + distance) >= maxX)
|
||||
distance = maxX - contentOffset.x;
|
||||
|
||||
translation = CGPointMake(distance, 0);
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
self.contentOffset = CGPointMake(contentOffset.x + translation.x,
|
||||
contentOffset.y + translation.y);
|
||||
|
||||
NSIndexPath *indexPath = [self indexPathForItemNearPoint:_draggedView.center];
|
||||
[self updateDestinationIndexPath:indexPath];
|
||||
}
|
||||
|
||||
- (void)invalidateScrolling
|
||||
{
|
||||
[_scrollingDisplayLink invalidate];
|
||||
_scrollingDisplayLink = nil;
|
||||
|
||||
_scrollingDirection = TGDraggableCollectionScrollingDirectionUnknown;
|
||||
}
|
||||
|
||||
@end
|
||||
Reference in New Issue
Block a user