import UIKit
import AsyncDisplayKit
import SwiftSignalKit
private let usePerformanceTracker = false
private let useDynamicTuning = false
private let infiniteScrollSize: CGFloat = 10000.0
private let insertionAnimationDuration: Double = 0.4
private final class ListViewBackingLayer: CALayer {
override func setNeedsLayout() {
}
override func layoutSublayers() {
}
override func setNeedsDisplay() {
}
override func displayIfNeeded() {
}
override func needsDisplay() -> Bool {
return false
}
override func display() {
}
}
final class ListViewBackingView: UIView {
weak var target: ListView?
override class var layerClass: AnyClass {
return ListViewBackingLayer.self
}
override func setNeedsLayout() {
}
override func layoutSubviews() {
}
override func setNeedsDisplay() {
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
self.target?.touchesBegan(touches, with: event)
}
override func touchesCancelled(_ touches: Set<UITouch>?, with event: UIEvent?) {
self.target?.touchesCancelled(touches, with: event)
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
self.target?.touchesMoved(touches, with: event)
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
self.target?.touchesEnded(touches, with: event)
}
override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
if let target = target, target.limitHitTestToNodes {
if !target.internalHitTest(point, with: event) {
return nil
}
}
return super.hitTest(point, with: event)
}
}
private final class ListViewTimerProxy: NSObject {
private let action: () -> ()
init(_ action: @escaping () -> ()) {
self.action = action
super.init()
}
@objc func timerEvent() {
self.action()
}
}
public enum ListViewVisibleContentOffset {
case known(CGFloat)
case unknown
case none
}
open class ListView: ASDisplayNode, UIScrollViewDelegate, UIGestureRecognizerDelegate {
private final let scroller: ListViewScroller
private final var visibleSize: CGSize = CGSize()
private final var insets = UIEdgeInsets()
private final var lastContentOffset: CGPoint = CGPoint()
private final var lastContentOffsetTimestamp: CFAbsoluteTime = 0.0
private final var ignoreScrollingEvents: Bool = false
private final var displayLink: CADisplayLink!
private final var needsAnimations = false
private final var invisibleInset: CGFloat = 500.0
public var preloadPages: Bool = true {
didSet {
if self.preloadPages != oldValue {
self.invisibleInset = self.preloadPages ? 500.0 : 20.0
//self.invisibleInset = self.preloadPages ? 20.0 : 20.0
if self.preloadPages {
self.enqueueUpdateVisibleItems()
}
}
}
}
public final var stackFromBottom: Bool = false
public final var stackFromBottomInsetItemFactor: CGFloat = 0.0
public final var limitHitTestToNodes: Bool = false
public final var keepBottomItemOverscrollBackground: Bool = false
public final var snapToBottomInsetUntilFirstInteraction: Bool = false
private var bottomItemOverscrollBackground: ASDisplayNode?
private var touchesPosition = CGPoint()
private var isTracking = false
private var isDeceleratingAfterTracking = false
private final var transactionQueue: ListViewTransactionQueue
private final var transactionOffset: CGFloat = 0.0
private final var enqueuedUpdateVisibleItems = false
private final var createdItemNodes = 0
public final var synchronousNodes = false
public final var debugInfo = false
private final var items: [ListViewItem] = []
private final var itemNodes: [ListViewItemNode] = []
private final var itemHeaderNodes: [Int64: ListViewItemHeaderNode] = [:]
public final var displayedItemRangeChanged: (ListViewDisplayedItemRange, Any?) -> Void = { _, _ in }
public private(set) final var displayedItemRange: ListViewDisplayedItemRange = ListViewDisplayedItemRange(loadedRange: nil, visibleRange: nil)
private final var opaqueTransactionState: Any?
public final var visibleContentOffsetChanged: (ListViewVisibleContentOffset) -> Void = { _ in }
private final var animations: [ListViewAnimation] = []
private final var actionsForVSync: [() -> ()] = []
private final var inVSync = false
private let frictionSlider = UISlider()
private let springSlider = UISlider()
private let freeResistanceSlider = UISlider()
private let scrollingResistanceSlider = UISlider()
//let performanceTracker: FBAnimationPerformanceTracker
private var selectionTouchLocation: CGPoint?
private var selectionTouchDelayTimer: Foundation.Timer?
private var flashNodesDelayTimer: Foundation.Timer?
private var highlightedItemIndex: Int?
private let waitingForNodesDisposable = MetaDisposable()
public func reportDurationInMS(duration: Int, smallDropEvent: Double, largeDropEvent: Double) {
print("reportDurationInMS duration: \(duration), smallDropEvent: \(smallDropEvent), largeDropEvent: \(largeDropEvent)")
}
public func reportStackTrace(stack: String!, withSlide slide: String!) {
NSLog("reportStackTrace stack: \(stack)\n\nslide: \(slide)")
}
override public init() {
class DisplayLinkProxy: NSObject {
weak var target: ListView?
init(target: ListView) {
self.target = target
}
@objc func displayLinkEvent() {
self.target?.displayLinkEvent()
}
}
self.transactionQueue = ListViewTransactionQueue()
self.scroller = ListViewScroller()
/*var performanceTrackerConfig = FBAnimationPerformanceTracker.standardConfig()
performanceTrackerConfig.reportStackTraces = true
self.performanceTracker = FBAnimationPerformanceTracker(config: performanceTrackerConfig)*/
super.init(viewBlock: { Void -> UIView in
return ListViewBackingView()
}, didLoad: nil)
self.clipsToBounds = true
(self.view as! ListViewBackingView).target = self
self.transactionQueue.transactionCompleted = { [weak self] in
if let strongSelf = self {
strongSelf.updateVisibleItemRange()
}
}
//self.performanceTracker.delegate = self
self.scroller.alwaysBounceVertical = true
self.scroller.contentSize = CGSize(width: 0.0, height: infiniteScrollSize * 2.0)
self.scroller.isHidden = true
self.scroller.delegate = self
self.view.addSubview(self.scroller)
self.scroller.panGestureRecognizer.cancelsTouchesInView = true
self.view.addGestureRecognizer(self.scroller.panGestureRecognizer)
let trackingRecognizer = UIPanGestureRecognizer(target: self, action: #selector(self.trackingGesture(_:)))
trackingRecognizer.delegate = self
self.view.addGestureRecognizer(trackingRecognizer)
self.displayLink = CADisplayLink(target: DisplayLinkProxy(target: self), selector: #selector(DisplayLinkProxy.displayLinkEvent))
self.displayLink.add(to: RunLoop.main, forMode: RunLoopMode.commonModes)
if #available(iOS 10.0, *) {
self.displayLink.preferredFramesPerSecond = 60
}
self.displayLink.isPaused = true
if useDynamicTuning {
self.frictionSlider.addTarget(self, action: #selector(self.frictionSliderChanged(_:)), for: .valueChanged)
self.springSlider.addTarget(self, action: #selector(self.springSliderChanged(_:)), for: .valueChanged)
self.freeResistanceSlider.addTarget(self, action: #selector(self.freeResistanceSliderChanged(_:)), for: .valueChanged)
self.scrollingResistanceSlider.addTarget(self, action: #selector(self.scrollingResistanceSliderChanged(_:)), for: .valueChanged)
self.frictionSlider.minimumValue = Float(testSpringFrictionLimits.0)
self.frictionSlider.maximumValue = Float(testSpringFrictionLimits.1)
self.frictionSlider.value = Float(testSpringFriction)
self.springSlider.minimumValue = Float(testSpringConstantLimits.0)
self.springSlider.maximumValue = Float(testSpringConstantLimits.1)
self.springSlider.value = Float(testSpringConstant)
self.freeResistanceSlider.minimumValue = Float(testSpringResistanceFreeLimits.0)
self.freeResistanceSlider.maximumValue = Float(testSpringResistanceFreeLimits.1)
self.freeResistanceSlider.value = Float(testSpringFreeResistance)
self.scrollingResistanceSlider.minimumValue = Float(testSpringResistanceScrollingLimits.0)
self.scrollingResistanceSlider.maximumValue = Float(testSpringResistanceScrollingLimits.1)
self.scrollingResistanceSlider.value = Float(testSpringScrollingResistance)
self.view.addSubview(self.frictionSlider)
self.view.addSubview(self.springSlider)
self.view.addSubview(self.freeResistanceSlider)
self.view.addSubview(self.scrollingResistanceSlider)
}
}
deinit {
self.pauseAnimations()
self.displayLink.invalidate()
for itemNode in self.itemNodes {
ASDeallocQueue.sharedDeallocation().releaseObject(inBackground: itemNode)
}
for itemHeaderNode in self.itemHeaderNodes {
ASDeallocQueue.sharedDeallocation().releaseObject(inBackground: itemHeaderNode)
}
self.waitingForNodesDisposable.dispose()
}
@objc func frictionSliderChanged(_ slider: UISlider) {
testSpringFriction = CGFloat(slider.value)
print("friction: \(testSpringFriction)")
}
@objc func springSliderChanged(_ slider: UISlider) {
testSpringConstant = CGFloat(slider.value)
print("spring: \(testSpringConstant)")
}
@objc func freeResistanceSliderChanged(_ slider: UISlider) {
testSpringFreeResistance = CGFloat(slider.value)
print("free resistance: \(testSpringFreeResistance)")
}
@objc func scrollingResistanceSliderChanged(_ slider: UISlider) {
testSpringScrollingResistance = CGFloat(slider.value)
print("free resistance: \(testSpringScrollingResistance)")
}
private func displayLinkEvent() {
self.updateAnimations()
}
private func setNeedsAnimations() {
if !self.needsAnimations {
self.needsAnimations = true
self.displayLink.isPaused = false
}
}
private func pauseAnimations() {
if self.needsAnimations {
self.needsAnimations = false
self.displayLink.isPaused = true
}
}
private func dispatchOnVSync(forceNext: Bool = false, action: @escaping () -> ()) {
Queue.mainQueue().async {
if !forceNext && self.inVSync {
action()
} else {
action()
//self.actionsForVSync.append(action)
//self.setNeedsAnimations()
}
}
}
private func resetHeaderItemsFlashTimer(start: Bool) {
if let flashNodesDelayTimer = self.flashNodesDelayTimer {
flashNodesDelayTimer.invalidate()
self.flashNodesDelayTimer = nil
}
if start {
let timer = Timer(timeInterval: 0.3, target: ListViewTimerProxy { [weak self] in
if let strongSelf = self {
if let flashNodesDelayTimer = strongSelf.flashNodesDelayTimer {
flashNodesDelayTimer.invalidate()
strongSelf.flashNodesDelayTimer = nil
strongSelf.updateHeaderItemsFlashing(animated: true)
}
}
}, selector: #selector(ListViewTimerProxy.timerEvent), userInfo: nil, repeats: false)
self.flashNodesDelayTimer = timer
RunLoop.main.add(timer, forMode: RunLoopMode.commonModes)
self.updateHeaderItemsFlashing(animated: true)
}
}
private func headerItemsAreFlashing() -> Bool {
//print("\(self.scroller.isDragging) || (\(self.scroller.isDecelerating) && \(self.isDeceleratingAfterTracking)) || \(self.flashNodesDelayTimer != nil)")
return self.scroller.isDragging || (self.isDeceleratingAfterTracking) || self.flashNodesDelayTimer != nil
}
private func updateHeaderItemsFlashing(animated: Bool) {
let flashing = self.headerItemsAreFlashing()
for (_, headerNode) in self.itemHeaderNodes {
headerNode.updateFlashingOnScrolling(flashing, animated: animated)
}
}
public func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
self.lastContentOffsetTimestamp = 0.0
self.resetHeaderItemsFlashTimer(start: false)
self.updateHeaderItemsFlashing(animated: true)
if self.snapToBottomInsetUntilFirstInteraction {
self.snapToBottomInsetUntilFirstInteraction = false
}
/*if usePerformanceTracker {
self.performanceTracker.start()
}*/
}
public func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
if decelerate {
self.lastContentOffsetTimestamp = CACurrentMediaTime()
self.isDeceleratingAfterTracking = true
self.updateHeaderItemsFlashing(animated: true)
} else {
self.isDeceleratingAfterTracking = false
self.resetHeaderItemsFlashTimer(start: true)
self.updateHeaderItemsFlashing(animated: true)
self.lastContentOffsetTimestamp = 0.0
/*if usePerformanceTracker {
self.performanceTracker.stop()
}*/
}
}
public func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
self.lastContentOffsetTimestamp = 0.0
self.isDeceleratingAfterTracking = false
self.resetHeaderItemsFlashTimer(start: true)
self.updateHeaderItemsFlashing(animated: true)
/*if usePerformanceTracker {
self.performanceTracker.stop()
}*/
}
public func scrollViewDidScroll(_ scrollView: UIScrollView) {
if self.ignoreScrollingEvents || scroller !== self.scroller {
return
}
//CATransaction.begin()
//CATransaction.setDisableActions(true)
let deltaY = scrollView.contentOffset.y - self.lastContentOffset.y
self.lastContentOffset = scrollView.contentOffset
if self.lastContentOffsetTimestamp > DBL_EPSILON {
self.lastContentOffsetTimestamp = CACurrentMediaTime()
}
self.transactionOffset += -deltaY
self.enqueueUpdateVisibleItems()
var useScrollDynamics = false
let anchor: CGFloat
if self.isTracking {
anchor = self.touchesPosition.y
} else if deltaY < 0.0 {
anchor = self.visibleSize.height
} else {
anchor = 0.0
}
for itemNode in self.itemNodes {
let position = itemNode.position
itemNode.position = CGPoint(x: position.x, y: position.y - deltaY)
if itemNode.wantsScrollDynamics {
useScrollDynamics = true
var distance: CGFloat
let itemFrame = itemNode.apparentFrame
if anchor < itemFrame.origin.y {
distance = abs(itemFrame.origin.y - anchor)
} else if anchor > itemFrame.origin.y + itemFrame.size.height {
distance = abs(anchor - (itemFrame.origin.y + itemFrame.size.height))
} else {
distance = 0.0
}
let factor: CGFloat = max(0.08, abs(distance) / self.visibleSize.height)
let resistance: CGFloat = testSpringFreeResistance
itemNode.addScrollingOffset(deltaY * factor * resistance)
}
}
if !self.snapToBounds(snapTopItem: false, stackFromBottom: self.stackFromBottom).offset.isZero {
self.updateVisibleContentOffset()
}
self.updateScroller()
self.updateItemHeaders()
for (headerId, headerNode) in self.itemHeaderNodes {
//let position = headerNode.position
//headerNode.position = CGPoint(x: position.x, y: position.y - deltaY)
if headerNode.wantsScrollDynamics {
useScrollDynamics = true
var distance: CGFloat
let itemFrame = headerNode.frame
if anchor < itemFrame.origin.y {
distance = abs(itemFrame.origin.y - anchor)
} else if anchor > itemFrame.origin.y + itemFrame.size.height {
distance = abs(anchor - (itemFrame.origin.y + itemFrame.size.height))
} else {
distance = 0.0
}
let factor: CGFloat = max(0.08, abs(distance) / self.visibleSize.height)
let resistance: CGFloat = testSpringFreeResistance
headerNode.addScrollingOffset(deltaY * factor * resistance)
}
}
if useScrollDynamics {
self.setNeedsAnimations()
}
self.updateVisibleContentOffset()
self.updateVisibleItemRange()
//CATransaction.commit()
}
private func calculateAdditionalTopInverseInset() -> CGFloat {
var additionalInverseTopInset: CGFloat = 0.0
if !self.stackFromBottomInsetItemFactor.isZero {
var remainingFactor = self.stackFromBottomInsetItemFactor
for itemNode in self.itemNodes {
if remainingFactor.isLessThanOrEqualTo(0.0) {
break
}
let itemFactor: CGFloat
if CGFloat(1.0).isLessThanOrEqualTo(remainingFactor) {
itemFactor = 1.0
} else {
itemFactor = remainingFactor
}
additionalInverseTopInset += floor(itemNode.apparentBounds.height * itemFactor)
remainingFactor -= 1.0
}
}
return additionalInverseTopInset
}
private func snapToBounds(snapTopItem: Bool, stackFromBottom: Bool, updateSizeAndInsets: ListViewUpdateSizeAndInsets? = nil, scrollToItem: ListViewScrollToItem? = nil) -> (snappedTopInset: CGFloat, offset: CGFloat) {
if self.itemNodes.count == 0 {
return (0.0, 0.0)
}
var overscroll: CGFloat = 0.0
if self.scroller.contentOffset.y < 0.0 {
overscroll = self.scroller.contentOffset.y
} else if self.scroller.contentOffset.y > max(0.0, self.scroller.contentSize.height - self.scroller.bounds.size.height) {
overscroll = self.scroller.contentOffset.y - max(0.0, (self.scroller.contentSize.height - self.scroller.bounds.size.height))
}
var completeHeight: CGFloat = 0.0
var topItemFound = false
var bottomItemFound = false
var topItemEdge: CGFloat = 0.0
var bottomItemEdge: CGFloat = 0.0
for i in 0 ..< self.itemNodes.count {
if let index = itemNodes[i].index {
if index == 0 {
topItemFound = true
}
break
}
}
var effectiveInsets = self.insets
if topItemFound && !self.stackFromBottomInsetItemFactor.isZero {
let additionalInverseTopInset = self.calculateAdditionalTopInverseInset()
effectiveInsets.top = max(effectiveInsets.top, self.visibleSize.height - additionalInverseTopInset)
}
if topItemFound {
topItemEdge = itemNodes[0].apparentFrame.origin.y
}
var bottomItemNode: ListViewItemNode?
for i in (0 ..< self.itemNodes.count).reversed() {
if let index = itemNodes[i].index {
if index == self.items.count - 1 {
bottomItemNode = itemNodes[i]
bottomItemFound = true
}
break
}
}
if bottomItemFound {
bottomItemEdge = itemNodes[itemNodes.count - 1].apparentFrame.maxY
}
if topItemFound && bottomItemFound {
for itemNode in self.itemNodes {
completeHeight += itemNode.apparentBounds.height
}
}
var transition: ContainedViewLayoutTransition = .immediate
if let updateSizeAndInsets = updateSizeAndInsets {
if updateSizeAndInsets.duration > DBL_EPSILON {
switch updateSizeAndInsets.curve {
case let .Spring(duration):
transition = .animated(duration: duration, curve: .spring)
case .Default:
transition = .animated(duration: updateSizeAndInsets.duration, curve: .easeInOut)
}
}
} else if let scrollToItem = scrollToItem {
switch scrollToItem.curve {
case let .Spring(duration):
transition = .animated(duration: duration, curve: .spring)
case .Default:
transition = .animated(duration: 0.5, curve: .easeInOut)
}
}
var offset: CGFloat = 0.0
if topItemFound && bottomItemFound {
let visibleAreaHeight = self.visibleSize.height - effectiveInsets.bottom - effectiveInsets.top
if self.stackFromBottom {
if visibleAreaHeight > completeHeight {
let areaHeight = completeHeight
if topItemEdge < self.visibleSize.height - effectiveInsets.bottom - areaHeight - overscroll {
offset = self.visibleSize.height - effectiveInsets.bottom - areaHeight - overscroll - topItemEdge
} else if bottomItemEdge > self.visibleSize.height - effectiveInsets.bottom - overscroll {
offset = self.visibleSize.height - effectiveInsets.bottom - overscroll - bottomItemEdge
}
} else {
let areaHeight = min(completeHeight, visibleAreaHeight)
if bottomItemEdge < effectiveInsets.top + areaHeight - overscroll {
offset = effectiveInsets.top + areaHeight - overscroll - bottomItemEdge
} else if topItemEdge > effectiveInsets.top - overscroll {
offset = (effectiveInsets.top - overscroll) - topItemEdge
}
}
} else {
let areaHeight = min(completeHeight, visibleAreaHeight)
if bottomItemEdge < effectiveInsets.top + areaHeight - overscroll {
offset = effectiveInsets.top + areaHeight - overscroll - bottomItemEdge
} else if topItemEdge > effectiveInsets.top - overscroll && /*snapTopItem*/ true {
offset = (effectiveInsets.top - overscroll) - topItemEdge
}
}
if visibleAreaHeight > completeHeight {
if let itemNode = bottomItemNode, itemNode.wantsTrailingItemSpaceUpdates {
itemNode.updateTrailingItemSpace(visibleAreaHeight - completeHeight, transition: transition)
}
} else {
if let itemNode = bottomItemNode, itemNode.wantsTrailingItemSpaceUpdates {
itemNode.updateTrailingItemSpace(0.0, transition: transition)
}
}
} else {
if let itemNode = bottomItemNode, itemNode.wantsTrailingItemSpaceUpdates {
itemNode.updateTrailingItemSpace(0.0, transition: transition)
}
if topItemFound {
if topItemEdge > effectiveInsets.top - overscroll && /*snapTopItem*/ true {
offset = (effectiveInsets.top - overscroll) - topItemEdge
}
} else if bottomItemFound {
if bottomItemEdge < self.visibleSize.height - effectiveInsets.bottom - overscroll {
offset = self.visibleSize.height - effectiveInsets.bottom - overscroll - bottomItemEdge
}
}
}
if abs(offset) > CGFloat.ulpOfOne {
for itemNode in self.itemNodes {
var frame = itemNode.frame
frame.origin.y += offset
itemNode.frame = frame
}
}
var snappedTopInset: CGFloat = 0.0
if !self.stackFromBottomInsetItemFactor.isZero && topItemFound {
snappedTopInset = max(0.0, (effectiveInsets.top - self.insets.top) - (topItemEdge + offset))
}
return (snappedTopInset, offset)
}
private func updateVisibleContentOffset() {
var offset: ListViewVisibleContentOffset = .unknown
var topItemIndexAndFrame: (Int, CGRect) = (-1, CGRect())
for itemNode in self.itemNodes {
if let index = itemNode.index {
topItemIndexAndFrame = (index, itemNode.apparentFrame)
break
}
}
if topItemIndexAndFrame.0 == 0 {
offset = .known(-(topItemIndexAndFrame.1.minY - self.insets.top))
} else if topItemIndexAndFrame.0 == -1 {
offset = .none
}
self.visibleContentOffsetChanged(offset)
}
private func stopScrolling() {
let wasIgnoringScrollingEvents = self.ignoreScrollingEvents
self.ignoreScrollingEvents = true
self.scroller.setContentOffset(self.scroller.contentOffset, animated: false)
self.ignoreScrollingEvents = wasIgnoringScrollingEvents
}
private func updateBottomItemOverscrollBackground() {
if self.keepBottomItemOverscrollBackground {
var bottomItemFound = false
if self.itemNodes[itemNodes.count - 1].index == self.items.count - 1 {
bottomItemFound = true
}
let bottomItemOverscrollBackground: ASDisplayNode
if let currentBottomItemOverscrollBackground = self.bottomItemOverscrollBackground {
bottomItemOverscrollBackground = currentBottomItemOverscrollBackground
} else {
bottomItemOverscrollBackground = ASDisplayNode()
bottomItemOverscrollBackground.backgroundColor = .white
bottomItemOverscrollBackground.isLayerBacked = true
self.insertSubnode(bottomItemOverscrollBackground, at: 0)
self.bottomItemOverscrollBackground = bottomItemOverscrollBackground
}
if bottomItemFound {
let realBottomItemEdge = itemNodes.last!.apparentFrame.origin.y
let realBottomItemEdgeOffset = max(0.0, self.visibleSize.height - realBottomItemEdge)
let backgroundFrame = CGRect(origin: CGPoint(x: 0.0, y: self.visibleSize.height - realBottomItemEdgeOffset), size: CGSize(width: self.visibleSize.width, height: self.visibleSize.height))
if !backgroundFrame.equalTo(bottomItemOverscrollBackground.frame) {
bottomItemOverscrollBackground.frame = backgroundFrame
}
} else {
let backgroundFrame = CGRect(origin: CGPoint(x: 0.0, y: self.visibleSize.height), size: CGSize(width: self.visibleSize.width, height: self.visibleSize.height))
if !backgroundFrame.equalTo(bottomItemOverscrollBackground.frame) {
bottomItemOverscrollBackground.frame = backgroundFrame
}
}
}
}
private func updateScroller() {
if itemNodes.count == 0 {
return
}
var topItemFound = false
var bottomItemFound = false
var topItemEdge: CGFloat = 0.0
var bottomItemEdge: CGFloat = 0.0
for i in 0 ..< self.itemNodes.count {
if let index = itemNodes[i].index {
if index == 0 {
topItemFound = true
topItemEdge = itemNodes[0].apparentFrame.origin.y
break
}
}
}
var effectiveInsets = self.insets
if topItemFound && !self.stackFromBottomInsetItemFactor.isZero {
let additionalInverseTopInset = self.calculateAdditionalTopInverseInset()
effectiveInsets.top = max(effectiveInsets.top, self.visibleSize.height - additionalInverseTopInset)
}
var completeHeight = effectiveInsets.top + effectiveInsets.bottom
if itemNodes[itemNodes.count - 1].index == self.items.count - 1 {
bottomItemFound = true
bottomItemEdge = itemNodes[itemNodes.count - 1].apparentFrame.maxY
}
topItemEdge -= effectiveInsets.top
bottomItemEdge += effectiveInsets.bottom
if topItemFound && bottomItemFound {
for itemNode in self.itemNodes {
completeHeight += itemNode.apparentBounds.height
}
if self.stackFromBottom {
let updatedCompleteHeight = max(completeHeight, self.visibleSize.height)
let deltaCompleteHeight = updatedCompleteHeight - completeHeight
topItemEdge -= deltaCompleteHeight
bottomItemEdge -= deltaCompleteHeight
completeHeight = updatedCompleteHeight
}
}
self.updateBottomItemOverscrollBackground()
let wasIgnoringScrollingEvents = self.ignoreScrollingEvents
self.ignoreScrollingEvents = true
if topItemFound && bottomItemFound {
if self.stackFromBottom {
self.lastContentOffset = CGPoint(x: 0.0, y: -topItemEdge)
} else {
self.lastContentOffset = CGPoint(x: 0.0, y: -topItemEdge)
}
self.scroller.contentSize = CGSize(width: self.visibleSize.width, height: completeHeight)
self.scroller.contentOffset = self.lastContentOffset
} else if topItemFound {
self.scroller.contentSize = CGSize(width: self.visibleSize.width, height: infiniteScrollSize * 2.0)
self.lastContentOffset = CGPoint(x: 0.0, y: -topItemEdge)
self.scroller.contentOffset = self.lastContentOffset
} else if bottomItemFound {
self.scroller.contentSize = CGSize(width: self.visibleSize.width, height: infiniteScrollSize * 2.0)
self.lastContentOffset = CGPoint(x: 0.0, y: infiniteScrollSize * 2.0 - bottomItemEdge)
self.scroller.contentOffset = self.lastContentOffset
}
else
{
self.scroller.contentSize = CGSize(width: self.visibleSize.width, height: infiniteScrollSize * 2.0)
self.lastContentOffset = CGPoint(x: 0.0, y: infiniteScrollSize)
self.scroller.contentOffset = self.lastContentOffset
}
self.ignoreScrollingEvents = wasIgnoringScrollingEvents
}
private func async(_ f: @escaping () -> Void) {
DispatchQueue.global().async(execute: f)
}
private func nodeForItem(synchronous: Bool, item: ListViewItem, previousNode: ListViewItemNode?, index: Int, previousItem: ListViewItem?, nextItem: ListViewItem?, width: CGFloat, updateAnimation: ListViewItemUpdateAnimation, completion: @escaping (ListViewItemNode, ListViewItemNodeLayout, @escaping () -> (Signal<Void, NoError>?, () -> Void)) -> Void) {
if let previousNode = previousNode {
item.updateNode(async: { f in
if synchronous {
f()
} else {
self.async(f)
}
}, node: previousNode, width: width, previousItem: previousItem, nextItem: nextItem, animation: updateAnimation, completion: { (layout, apply) in
if Thread.isMainThread {
if synchronous {
completion(previousNode, layout, {
return (nil, {
previousNode.index = index
apply()
})
})
} else {
self.async {
completion(previousNode, layout, {
return (nil, {
previousNode.index = index
apply()
})
})
}
}
} else {
completion(previousNode, layout, {
return (nil, {
previousNode.index = index
apply()
})
})
}
})
} else {
item.nodeConfiguredForWidth(async: { f in
if synchronous {
f()
} else {
self.async(f)
}
}, width: width, previousItem: previousItem, nextItem: nextItem, completion: { itemNode, apply in
itemNode.index = index
completion(itemNode, ListViewItemNodeLayout(contentSize: itemNode.contentSize, insets: itemNode.insets), apply)
})
}
}
private func currentState() -> ListViewState {
var nodes: [ListViewStateNode] = []
nodes.reserveCapacity(self.itemNodes.count)
for node in self.itemNodes {
if let index = node.index {
nodes.append(.Node(index: index, frame: node.apparentFrame, referenceNode: node))
} else {
nodes.append(.Placeholder(frame: node.apparentFrame))
}
}
return ListViewState(insets: self.insets, visibleSize: self.visibleSize, invisibleInset: self.invisibleInset, nodes: nodes, scrollPosition: nil, stationaryOffset: nil, stackFromBottom: self.stackFromBottom)
}
public func transaction(deleteIndices: [ListViewDeleteItem], insertIndicesAndItems: [ListViewInsertItem], updateIndicesAndItems: [ListViewUpdateItem], options: ListViewDeleteAndInsertOptions, scrollToItem: ListViewScrollToItem? = nil, updateSizeAndInsets: ListViewUpdateSizeAndInsets? = nil, stationaryItemRange: (Int, Int)? = nil, updateOpaqueState: Any?, completion: @escaping (ListViewDisplayedItemRange) -> Void = { _ in }) {
if deleteIndices.isEmpty && insertIndicesAndItems.isEmpty && updateIndicesAndItems.isEmpty && scrollToItem == nil && updateSizeAndInsets == nil {
completion(self.immediateDisplayedItemRange())
return
}
self.transactionQueue.addTransaction({ [weak self] transactionCompletion in
if let strongSelf = self {
strongSelf.transactionOffset = 0.0
strongSelf.deleteAndInsertItemsTransaction(deleteIndices: deleteIndices, insertIndicesAndItems: insertIndicesAndItems, updateIndicesAndItems: updateIndicesAndItems, options: options, scrollToItem: scrollToItem, updateSizeAndInsets: updateSizeAndInsets, stationaryItemRange: stationaryItemRange, updateOpaqueState: updateOpaqueState, completion: { [weak strongSelf] in
completion(strongSelf?.immediateDisplayedItemRange() ?? ListViewDisplayedItemRange(loadedRange: nil, visibleRange: nil))
transactionCompletion()
})
}
})
}
private func deleteAndInsertItemsTransaction(deleteIndices: [ListViewDeleteItem], insertIndicesAndItems: [ListViewInsertItem], updateIndicesAndItems: [ListViewUpdateItem], options: ListViewDeleteAndInsertOptions, scrollToItem: ListViewScrollToItem?, updateSizeAndInsets: ListViewUpdateSizeAndInsets?, stationaryItemRange: (Int, Int)?, updateOpaqueState: Any?, completion: @escaping (Void) -> Void) {
if deleteIndices.isEmpty && insertIndicesAndItems.isEmpty && updateIndicesAndItems.isEmpty && scrollToItem == nil {
if let updateSizeAndInsets = updateSizeAndInsets , (self.items.count == 0 || (updateSizeAndInsets.size == self.visibleSize && updateSizeAndInsets.insets == self.insets)) {
self.visibleSize = updateSizeAndInsets.size
self.insets = updateSizeAndInsets.insets
if useDynamicTuning {
let size = updateSizeAndInsets.size
self.frictionSlider.frame = CGRect(x: 10.0, y: size.height - insets.bottom - 10.0 - self.frictionSlider.bounds.height, width: size.width - 20.0, height: self.frictionSlider.bounds.height)
self.springSlider.frame = CGRect(x: 10.0, y: self.frictionSlider.frame.minY - self.springSlider.bounds.height, width: size.width - 20.0, height: self.springSlider.bounds.height)
self.freeResistanceSlider.frame = CGRect(x: 10.0, y: self.springSlider.frame.minY - self.freeResistanceSlider.bounds.height, width: size.width - 20.0, height: self.freeResistanceSlider.bounds.height)
self.scrollingResistanceSlider.frame = CGRect(x: 10.0, y: self.freeResistanceSlider.frame.minY - self.scrollingResistanceSlider.bounds.height, width: size.width - 20.0, height: self.scrollingResistanceSlider.bounds.height)
}
let wasIgnoringScrollingEvents = self.ignoreScrollingEvents
self.ignoreScrollingEvents = true
self.scroller.frame = CGRect(origin: CGPoint(), size: updateSizeAndInsets.size)
self.scroller.contentSize = CGSize(width: updateSizeAndInsets.size.width, height: infiniteScrollSize * 2.0)
self.lastContentOffset = CGPoint(x: 0.0, y: infiniteScrollSize)
self.scroller.contentOffset = self.lastContentOffset
self.ignoreScrollingEvents = wasIgnoringScrollingEvents
self.updateScroller()
completion()
return
}
}
let startTime = CACurrentMediaTime()
var state = self.currentState()
let widthUpdated: Bool
if let updateSizeAndInsets = updateSizeAndInsets {
widthUpdated = abs(state.visibleSize.width - updateSizeAndInsets.size.width) > CGFloat.ulpOfOne
state.visibleSize = updateSizeAndInsets.size
state.insets = updateSizeAndInsets.insets
} else {
widthUpdated = false
}
if let scrollToItem = scrollToItem {
state.scrollPosition = (scrollToItem.index, scrollToItem.position)
}
state.fixScrollPostition(self.items.count)
let sortedDeleteIndices = deleteIndices.sorted(by: {$0.index < $1.index})
for deleteItem in sortedDeleteIndices.reversed() {
self.items.remove(at: deleteItem.index)
}
let sortedIndicesAndItems = insertIndicesAndItems.sorted(by: { $0.index < $1.index })
if self.items.count == 0 && !sortedIndicesAndItems.isEmpty {
if sortedIndicesAndItems[0].index != 0 {
fatalError("deleteAndInsertItems: invalid insert into empty list")
}
}
var previousNodes: [Int: ListViewItemNode] = [:]
for insertedItem in sortedIndicesAndItems {
self.items.insert(insertedItem.item, at: insertedItem.index)
if let previousIndex = insertedItem.previousIndex {
for itemNode in self.itemNodes {
if itemNode.index == previousIndex {
previousNodes[insertedItem.index] = itemNode
}
}
}
}
for updatedItem in updateIndicesAndItems {
self.items[updatedItem.index] = updatedItem.item
for itemNode in self.itemNodes {
if itemNode.index == updatedItem.previousIndex {
previousNodes[updatedItem.index] = itemNode
break
}
}
}
let actions = {
var previousFrames: [Int: CGRect] = [:]
for i in 0 ..< state.nodes.count {
if let index = state.nodes[i].index {
previousFrames[index] = state.nodes[i].frame
}
}
var operations: [ListViewStateOperation] = []
var deleteDirectionHints: [Int: ListViewItemOperationDirectionHint] = [:]
var insertDirectionHints: [Int: ListViewItemOperationDirectionHint] = [:]
var deleteIndexSet = Set<Int>()
for deleteItem in deleteIndices {
deleteIndexSet.insert(deleteItem.index)
if let directionHint = deleteItem.directionHint {
deleteDirectionHints[deleteItem.index] = directionHint
}
}
var insertedIndexSet = Set<Int>()
for insertedItem in sortedIndicesAndItems {
insertedIndexSet.insert(insertedItem.index)
if let directionHint = insertedItem.directionHint {
insertDirectionHints[insertedItem.index] = directionHint
}
}
let animated = options.contains(.AnimateInsertion)
var remapDeletion: [Int: Int] = [:]
var updateAdjacentItemsIndices = Set<Int>()
var i = 0
while i < state.nodes.count {
if let index = state.nodes[i].index {
var indexOffset = 0
for deleteIndex in sortedDeleteIndices {
if deleteIndex.index < index {
indexOffset += 1
} else {
break
}
}
if deleteIndexSet.contains(index) {
previousFrames.removeValue(forKey: index)
state.removeNodeAtIndex(i, direction: deleteDirectionHints[index], animated: animated, operations: &operations)
} else {
let updatedIndex = index - indexOffset
if index != updatedIndex {
remapDeletion[index] = updatedIndex
}
if let previousFrame = previousFrames[index] {
previousFrames.removeValue(forKey: index)
previousFrames[updatedIndex] = previousFrame
}
if deleteIndexSet.contains(index - 1) || deleteIndexSet.contains(index + 1) {
updateAdjacentItemsIndices.insert(updatedIndex)
}
switch state.nodes[i] {
case let .Node(_, frame, referenceNode):
state.nodes[i] = .Node(index: updatedIndex, frame: frame, referenceNode: referenceNode)
case .Placeholder:
break
}
i += 1
}
} else {
i += 1
}
}
if !remapDeletion.isEmpty {
if self.debugInfo {
//print("remapDeletion \(remapDeletion)")
}
operations.append(.Remap(remapDeletion))
}
var remapInsertion: [Int: Int] = [:]
for i in 0 ..< state.nodes.count {
if let index = state.nodes[i].index {
var indexOffset = 0
for insertedItem in sortedIndicesAndItems {
if insertedItem.index <= index + indexOffset {
indexOffset += 1
}
}
if indexOffset != 0 {
let updatedIndex = index + indexOffset
remapInsertion[index] = updatedIndex
if let previousFrame = previousFrames[index] {
previousFrames.removeValue(forKey: index)
previousFrames[updatedIndex] = previousFrame
}
switch state.nodes[i] {
case let .Node(_, frame, referenceNode):
state.nodes[i] = .Node(index: updatedIndex, frame: frame, referenceNode: referenceNode)
case .Placeholder:
break
}
}
}
}
if !remapInsertion.isEmpty {
if self.debugInfo {
print("remapInsertion \(remapInsertion)")
}
operations.append(.Remap(remapInsertion))
var remappedUpdateAdjacentItemsIndices = Set<Int>()
for index in updateAdjacentItemsIndices {
if let remappedIndex = remapInsertion[index] {
remappedUpdateAdjacentItemsIndices.insert(remappedIndex)
} else {
remappedUpdateAdjacentItemsIndices.insert(index)
}
}
updateAdjacentItemsIndices = remappedUpdateAdjacentItemsIndices
}
if self.debugInfo {
//print("state \(state.nodes.map({$0.index ?? -1}))")
}
for node in state.nodes {
if let index = node.index {
if insertedIndexSet.contains(index - 1) || insertedIndexSet.contains(index + 1) {
updateAdjacentItemsIndices.insert(index)
}
}
}
if let (index, boundary) = stationaryItemRange {
state.setupStationaryOffset(index, boundary: boundary, frames: previousFrames)
}
if self.debugInfo {
print("deleteAndInsertItemsTransaction prepare \((CACurrentMediaTime() - startTime) * 1000.0) ms")
}
self.fillMissingNodes(synchronous: options.contains(.Synchronous), animated: animated, inputAnimatedInsertIndices: animated ? insertedIndexSet : Set<Int>(), insertDirectionHints: insertDirectionHints, inputState: state, inputPreviousNodes: previousNodes, inputOperations: operations, inputCompletion: { updatedState, operations in
if self.debugInfo {
print("fillMissingNodes completion \((CACurrentMediaTime() - startTime) * 1000.0) ms")
}
var updateIndices = updateAdjacentItemsIndices
if widthUpdated {
for case let .Node(index, _, _) in updatedState.nodes {
updateIndices.insert(index)
}
}
self.updateNodes(synchronous: options.contains(.Synchronous), animated: animated, updateIndicesAndItems: updateIndicesAndItems, inputState: updatedState, previousNodes: previousNodes, inputOperations: operations, completion: { updatedState, operations in
self.updateAdjacent(synchronous: options.contains(.Synchronous), animated: animated, state: updatedState, updateAdjacentItemsIndices: updateIndices, operations: operations, completion: { state, operations in
var updatedState = state
var updatedOperations = operations
updatedState.removeInvisibleNodes(&updatedOperations)
if self.debugInfo {
print("updateAdjacent completion \((CACurrentMediaTime() - startTime) * 1000.0) ms")
}
let stationaryItemIndex = updatedState.stationaryOffset?.0
let next = {
var updatedOperations = updatedOperations
var readySignals: [Signal<Void, NoError>]?
if options.contains(.PreferSynchronousResourceLoading) {
var currentReadySignals: [Signal<Void, NoError>] = []
for i in 0 ..< updatedOperations.count {
if case let .InsertNode(index, offsetDirection, nodeAnimated, node, layout, apply) = updatedOperations[i] {
let (ready, commitApply) = apply()
updatedOperations[i] = .InsertNode(index: index, offsetDirection: offsetDirection, animated: nodeAnimated, node: node, layout: layout, apply: {
return (nil, commitApply)
})
if let ready = ready {
currentReadySignals.append(ready)
}
}
}
readySignals = currentReadySignals
}
let beginReplay = { [weak self] in
if let strongSelf = self {
strongSelf.replayOperations(animated: animated, animateAlpha: options.contains(.AnimateAlpha), animateTopItemVerticalOrigin: options.contains(.AnimateTopItemPosition), operations: updatedOperations, requestItemInsertionAnimationsIndices: options.contains(.RequestItemInsertionAnimations) ? insertedIndexSet : Set(), scrollToItem: scrollToItem, updateSizeAndInsets: updateSizeAndInsets, stationaryItemIndex: stationaryItemIndex, updateOpaqueState: updateOpaqueState, completion: {
if options.contains(.PreferSynchronousDrawing) {
let startTime = CACurrentMediaTime()
self?.recursivelyEnsureDisplaySynchronously(true)
let deltaTime = CACurrentMediaTime() - startTime
print("ListView: waited \(deltaTime * 1000.0) ms for nodes to display")
}
completion()
})
}
}
if let readySignals = readySignals, !readySignals.isEmpty && false {
let readyWithTimeout = combineLatest(readySignals)
|> deliverOnMainQueue
|> timeout(0.2, queue: Queue.mainQueue(), alternate: .single([]))
let startTime = CACurrentMediaTime()
self.waitingForNodesDisposable.set(readyWithTimeout.start(completed: {
let deltaTime = CACurrentMediaTime() - startTime
print("ListView: waited \(deltaTime * 1000.0) ms for nodes to load")
beginReplay()
}))
} else {
beginReplay()
}
}
if options.contains(.LowLatency) || options.contains(.Synchronous) {
Queue.mainQueue().async {
if self.debugInfo {
print("updateAdjacent LowLatency enqueue \((CACurrentMediaTime() - startTime) * 1000.0) ms")
}
next()
}
} else {
self.dispatchOnVSync {
next()
}
}
})
})
})
}
if options.contains(.Synchronous) {
actions()
} else {
self.async(actions)
}
}
private func updateAdjacent(synchronous: Bool, animated: Bool, state: ListViewState, updateAdjacentItemsIndices: Set<Int>, operations: [ListViewStateOperation], completion: @escaping (ListViewState, [ListViewStateOperation]) -> Void) {
if updateAdjacentItemsIndices.isEmpty {
completion(state, operations)
} else {
let updateAnimation: ListViewItemUpdateAnimation = animated ? .System(duration: insertionAnimationDuration) : .None
var updatedUpdateAdjacentItemsIndices = updateAdjacentItemsIndices
let nodeIndex = updateAdjacentItemsIndices.first!
updatedUpdateAdjacentItemsIndices.remove(nodeIndex)
var continueWithoutNode = true
var i = 0
for node in state.nodes {
if case let .Node(index, _, referenceNode) = node , index == nodeIndex {
if let referenceNode = referenceNode {
continueWithoutNode = false
self.items[index].updateNode(async: { f in
if synchronous {
f()
} else {
self.async(f)
}
}, node: referenceNode, width: state.visibleSize.width, previousItem: index == 0 ? nil : self.items[index - 1], nextItem: index == self.items.count - 1 ? nil : self.items[index + 1], animation: updateAnimation, completion: { layout, apply in
var updatedState = state
var updatedOperations = operations
let heightDelta = layout.size.height - updatedState.nodes[i].frame.size.height
updatedOperations.append(.UpdateLayout(index: i, layout: layout, apply: {
return (nil, apply)
}))
if !animated {
let previousFrame = updatedState.nodes[i].frame
updatedState.nodes[i].frame = CGRect(origin: previousFrame.origin, size: layout.size)
if previousFrame.minY < updatedState.insets.top {
for j in 0 ... i {
updatedState.nodes[j].frame = updatedState.nodes[j].frame.offsetBy(dx: 0.0, dy: -heightDelta)
}
} else {
if i != updatedState.nodes.count {
for j in i + 1 ..< updatedState.nodes.count {
updatedState.nodes[j].frame = updatedState.nodes[j].frame.offsetBy(dx: 0.0, dy: heightDelta)
}
}
}
}
self.updateAdjacent(synchronous: synchronous, animated: animated, state: updatedState, updateAdjacentItemsIndices: updatedUpdateAdjacentItemsIndices, operations: updatedOperations, completion: completion)
})
}
break
}
i += 1
}
if continueWithoutNode {
updateAdjacent(synchronous: synchronous, animated: animated, state: state, updateAdjacentItemsIndices: updatedUpdateAdjacentItemsIndices, operations: operations, completion: completion)
}
}
}
private func fillMissingNodes(synchronous: Bool, animated: Bool, inputAnimatedInsertIndices: Set<Int>, insertDirectionHints: [Int: ListViewItemOperationDirectionHint], inputState: ListViewState, inputPreviousNodes: [Int: ListViewItemNode], inputOperations: [ListViewStateOperation], inputCompletion: @escaping (ListViewState, [ListViewStateOperation]) -> Void) {
let animatedInsertIndices = inputAnimatedInsertIndices
var state = inputState
var previousNodes = inputPreviousNodes
var operations = inputOperations
let completion = inputCompletion
let updateAnimation: ListViewItemUpdateAnimation = animated ? .System(duration: insertionAnimationDuration) : .None
if state.nodes.count > 1000 {
print("state.nodes.count > 1000")
}
while true {
if self.items.count == 0 {
completion(state, operations)
break
} else {
var insertionItemIndexAndDirection: (Int, ListViewInsertionOffsetDirection)?
if self.debugInfo {
assert(true)
}
if let insertionPoint = state.insertionPoint(insertDirectionHints, itemCount: self.items.count) {
insertionItemIndexAndDirection = (insertionPoint.index, insertionPoint.direction)
}
if self.debugInfo {
print("insertionItemIndexAndDirection \(insertionItemIndexAndDirection)")
}
if let insertionItemIndexAndDirection = insertionItemIndexAndDirection {
let index = insertionItemIndexAndDirection.0
let threadId = pthread_self()
var tailRecurse = false
self.nodeForItem(synchronous: synchronous, item: self.items[index], previousNode: previousNodes[index], index: index, previousItem: index == 0 ? nil : self.items[index - 1], nextItem: self.items.count == index + 1 ? nil : self.items[index + 1], width: state.visibleSize.width, updateAnimation: updateAnimation, completion: { (node, layout, apply) in
if pthread_equal(pthread_self(), threadId) != 0 && !tailRecurse {
tailRecurse = true
state.insertNode(index, node: node, layout: layout, apply: apply, offsetDirection: insertionItemIndexAndDirection.1, animated: animated && animatedInsertIndices.contains(index), operations: &operations, itemCount: self.items.count)
} else {
var updatedState = state
var updatedOperations = operations
updatedState.insertNode(index, node: node, layout: layout, apply: apply, offsetDirection: insertionItemIndexAndDirection.1, animated: animated && animatedInsertIndices.contains(index), operations: &updatedOperations, itemCount: self.items.count)
self.fillMissingNodes(synchronous: synchronous, animated: animated, inputAnimatedInsertIndices: animatedInsertIndices, insertDirectionHints: insertDirectionHints, inputState: updatedState, inputPreviousNodes: previousNodes, inputOperations: updatedOperations, inputCompletion: completion)
}
})
if !tailRecurse {
tailRecurse = true
break
}
} else {
completion(state, operations)
break
}
}
}
}
private func updateNodes(synchronous: Bool, animated: Bool, updateIndicesAndItems: [ListViewUpdateItem], inputState: ListViewState, previousNodes: [Int: ListViewItemNode], inputOperations: [ListViewStateOperation], completion: @escaping (ListViewState, [ListViewStateOperation]) -> Void) {
var state = inputState
var operations = inputOperations
var updateIndicesAndItems = updateIndicesAndItems
while true {
if updateIndicesAndItems.isEmpty {
completion(state, operations)
break
} else {
let updateItem = updateIndicesAndItems[0]
if let previousNode = previousNodes[updateItem.index] {
self.nodeForItem(synchronous: synchronous, item: updateItem.item, previousNode: previousNode, index: updateItem.index, previousItem: updateItem.index == 0 ? nil : self.items[updateItem.index - 1], nextItem: updateItem.index == (self.items.count - 1) ? nil : self.items[updateItem.index + 1], width: state.visibleSize.width, updateAnimation: animated ? .System(duration: insertionAnimationDuration) : .None, completion: { _, layout, apply in
state.updateNodeAtItemIndex(updateItem.index, layout: layout, direction: updateItem.directionHint, animation: animated ? .System(duration: insertionAnimationDuration) : .None, apply: apply, operations: &operations)
updateIndicesAndItems.remove(at: 0)
self.updateNodes(synchronous: synchronous, animated: animated, updateIndicesAndItems: updateIndicesAndItems, inputState: state, previousNodes: previousNodes, inputOperations: operations, completion: completion)
})
break
} else {
updateIndicesAndItems.remove(at: 0)
//self.updateNodes(synchronous: synchronous, animated: animated, updateIndicesAndItems: updateIndicesAndItems, inputState: state, previousNodes: previousNodes, inputOperations: operations, completion: completion)
}
}
}
}
private func referencePointForInsertionAtIndex(_ nodeIndex: Int) -> CGPoint {
var index = 0
for itemNode in self.itemNodes {
if index == nodeIndex {
return itemNode.apparentFrame.origin
}
index += 1
}
if self.itemNodes.count == 0 {
return CGPoint(x: 0.0, y: self.insets.top)
} else {
return CGPoint(x: 0.0, y: self.itemNodes[self.itemNodes.count - 1].apparentFrame.maxY)
}
}
private func insertNodeAtIndex(animated: Bool, animateAlpha: Bool, forceAnimateInsertion: Bool, previousFrame: CGRect?, nodeIndex: Int, offsetDirection: ListViewInsertionOffsetDirection, node: ListViewItemNode, layout: ListViewItemNodeLayout, apply: () -> (Signal<Void, NoError>?, () -> Void), timestamp: Double) {
let insertionOrigin = self.referencePointForInsertionAtIndex(nodeIndex)
let nodeOrigin: CGPoint
switch offsetDirection {
case .Up:
nodeOrigin = CGPoint(x: insertionOrigin.x, y: insertionOrigin.y - (animated ? 0.0 : layout.size.height))
case .Down:
nodeOrigin = insertionOrigin
}
let nodeFrame = CGRect(origin: nodeOrigin, size: CGSize(width: layout.size.width, height: layout.size.height))
let previousApparentHeight = node.apparentHeight
let previousInsets = node.insets
node.contentSize = layout.contentSize
node.insets = layout.insets
node.apparentHeight = animated ? 0.0 : layout.size.height
node.frame = nodeFrame
apply().1()
self.itemNodes.insert(node, at: nodeIndex)
if useDynamicTuning {
self.insertSubnode(node, at: 0)
} else {
//self.addSubnode(node)
}
var offsetHeight = node.apparentHeight
var takenAnimation = false
if let _ = previousFrame , animated && node.index != nil && nodeIndex != self.itemNodes.count - 1 {
let nextNode = self.itemNodes[nodeIndex + 1]
if nextNode.index == nil {
let nextHeight = nextNode.apparentHeight
if abs(nextHeight - previousApparentHeight) < CGFloat.ulpOfOne {
if let animation = nextNode.animationForKey("apparentHeight") {
node.apparentHeight = previousApparentHeight
offsetHeight = 0.0
var offsetPosition = nextNode.position
offsetPosition.y += nextHeight
nextNode.position = offsetPosition
nextNode.apparentHeight = 0.0
nextNode.removeApparentHeightAnimation()
takenAnimation = true
if abs(layout.size.height - previousApparentHeight) > CGFloat.ulpOfOne {
node.addApparentHeightAnimation(layout.size.height, duration: insertionAnimationDuration * UIView.animationDurationFactor(), beginAt: timestamp, update: { [weak node] progress, currentValue in
if let node = node {
node.animateFrameTransition(progress, currentValue)
}
})
if node.rotated {
node.transitionOffset += previousApparentHeight - layout.size.height
node.addTransitionOffsetAnimation(0.0, duration: insertionAnimationDuration * UIView.animationDurationFactor(), beginAt: timestamp)
}
}
}
}
}
}
if node.index == nil {
node.addApparentHeightAnimation(0.0, duration: insertionAnimationDuration * UIView.animationDurationFactor(), beginAt: timestamp)
node.animateRemoved(timestamp, duration: insertionAnimationDuration * UIView.animationDurationFactor())
} else if animated {
if !takenAnimation {
if !nodeFrame.size.height.isEqual(to: node.apparentHeight) {
node.addApparentHeightAnimation(nodeFrame.size.height, duration: insertionAnimationDuration * UIView.animationDurationFactor(), beginAt: timestamp, update: { [weak node] progress, currentValue in
if let node = node {
node.animateFrameTransition(progress, currentValue)
}
})
}
if let previousFrame = previousFrame {
if self.debugInfo {
assert(true)
}
let transitionOffsetDelta = nodeFrame.origin.y - previousFrame.origin.y
if node.rotated {
node.transitionOffset -= transitionOffsetDelta - previousApparentHeight + layout.size.height
} else {
node.transitionOffset += transitionOffsetDelta
}
node.addTransitionOffsetAnimation(0.0, duration: insertionAnimationDuration * UIView.animationDurationFactor(), beginAt: timestamp)
if previousInsets != layout.insets {
node.insets = previousInsets
node.addInsetsAnimationToValue(layout.insets, duration: insertionAnimationDuration * UIView.animationDurationFactor(), beginAt: timestamp)
}
} else {
if self.debugInfo {
assert(true)
}
if !node.rotated {
if !node.insets.top.isZero {
node.transitionOffset += node.insets.top
node.addTransitionOffsetAnimation(0.0, duration: insertionAnimationDuration * UIView.animationDurationFactor(), beginAt: timestamp)
}
}
node.animateInsertion(timestamp, duration: insertionAnimationDuration * UIView.animationDurationFactor(), short: false)
}
}
} else if animateAlpha && previousFrame == nil {
if forceAnimateInsertion {
node.animateInsertion(timestamp, duration: insertionAnimationDuration * UIView.animationDurationFactor(), short: true)
} else {
node.animateAdded(timestamp, duration: insertionAnimationDuration * UIView.animationDurationFactor())
}
}
if node.apparentHeight > CGFloat.ulpOfOne {
switch offsetDirection {
case .Up:
var i = nodeIndex - 1
while i >= 0 {
var frame = self.itemNodes[i].frame
frame.origin.y -= offsetHeight
self.itemNodes[i].frame = frame
i -= 1
}
case .Down:
var i = nodeIndex + 1
while i < self.itemNodes.count {
var frame = self.itemNodes[i].frame
frame.origin.y += offsetHeight
self.itemNodes[i].frame = frame
i += 1
}
}
}
}
private func lowestHeaderNode() -> ASDisplayNode? {
var lowestHeaderNode: ASDisplayNode?
var lowestHeaderNodeIndex: Int?
for (_, headerNode) in self.itemHeaderNodes {
if let index = self.subnodes.index(of: headerNode) {
if lowestHeaderNodeIndex == nil || index < lowestHeaderNodeIndex! {
lowestHeaderNodeIndex = index
lowestHeaderNode = headerNode
}
}
}
return lowestHeaderNode
}
private func topItemVerticalOrigin() -> CGFloat? {
var topItemFound = false
for i in 0 ..< self.itemNodes.count {
if let index = itemNodes[i].index {
if index == 0 {
topItemFound = true
}
break
}
}
if topItemFound {
return itemNodes[0].apparentFrame.origin.y
} else {
return nil
}
}
private func bottomItemMaxY() -> CGFloat? {
var bottomItemFound = false
for i in (0 ..< self.itemNodes.count).reversed() {
if let index = itemNodes[i].index {
if index == self.items.count - 1 {
bottomItemFound = true
break
}
}
}
if bottomItemFound {
return itemNodes.last!.apparentFrame.maxY
} else {
return nil
}
}
private func replayOperations(animated: Bool, animateAlpha: Bool, animateTopItemVerticalOrigin: Bool, operations: [ListViewStateOperation], requestItemInsertionAnimationsIndices: Set<Int>, scrollToItem: ListViewScrollToItem?, updateSizeAndInsets: ListViewUpdateSizeAndInsets?, stationaryItemIndex: Int?, updateOpaqueState: Any?, completion: () -> Void) {
let timestamp = CACurrentMediaTime()
if let updateOpaqueState = updateOpaqueState {
self.opaqueTransactionState = updateOpaqueState
}
var previousTopItemVerticalOrigin: CGFloat?
var previousBottomItemMaxY: CGFloat?
var snapshotView: UIView?
if animateTopItemVerticalOrigin {
previousTopItemVerticalOrigin = self.topItemVerticalOrigin()
previousBottomItemMaxY = self.bottomItemMaxY()
snapshotView = self.view.snapshotView(afterScreenUpdates: false)
}
var previousApparentFrames: [(ListViewItemNode, CGRect)] = []
for itemNode in self.itemNodes {
previousApparentFrames.append((itemNode, itemNode.apparentFrame))
}
var takenPreviousNodes = Set<ListViewItemNode>()
for operation in operations {
if case let .InsertNode(_, _, _, node, _, _) = operation {
takenPreviousNodes.insert(node)
}
}
let lowestHeaderNode = self.lowestHeaderNode()
for operation in operations {
switch operation {
case let .InsertNode(index, offsetDirection, nodeAnimated, node, layout, apply):
var previousFrame: CGRect?
for (previousNode, frame) in previousApparentFrames {
if previousNode === node {
previousFrame = frame
break
}
}
var forceAnimateInsertion = false
if let index = node.index, requestItemInsertionAnimationsIndices.contains(index) {
forceAnimateInsertion = true
}
var updatedPreviousFrame = previousFrame
if let previousFrame = previousFrame, previousFrame.minY >= self.visibleSize.height || previousFrame.maxY < 0.0 {
updatedPreviousFrame = nil
}
self.insertNodeAtIndex(animated: nodeAnimated, animateAlpha: animateAlpha, forceAnimateInsertion: forceAnimateInsertion, previousFrame: updatedPreviousFrame, nodeIndex: index, offsetDirection: offsetDirection, node: node, layout: layout, apply: apply, timestamp: timestamp)
if let _ = updatedPreviousFrame {
if let lowestHeaderNode = lowestHeaderNode {
self.insertSubnode(node, belowSubnode: lowestHeaderNode)
} else {
self.addSubnode(node)
}
} else {
if animated {
self.insertSubnode(node, at: 0)
} else {
if let lowestHeaderNode = lowestHeaderNode {
self.insertSubnode(node, belowSubnode: lowestHeaderNode)
} else {
self.addSubnode(node)
}
}
}
case let .InsertDisappearingPlaceholder(index, referenceNode, offsetDirection):
var height: CGFloat?
var previousLayout: ListViewItemNodeLayout?
for (node, previousFrame) in previousApparentFrames {
if node === referenceNode {
height = previousFrame.size.height
previousLayout = ListViewItemNodeLayout(contentSize: node.contentSize, insets: node.insets)
break
}
}
if let height = height, let previousLayout = previousLayout {
if takenPreviousNodes.contains(referenceNode) {
self.insertNodeAtIndex(animated: false, animateAlpha: false, forceAnimateInsertion: false, previousFrame: nil, nodeIndex: index, offsetDirection: offsetDirection, node: ListViewItemNode(layerBacked: true), layout: ListViewItemNodeLayout(contentSize: CGSize(width: self.visibleSize.width, height: height), insets: UIEdgeInsets()), apply: { return (nil, {}) }, timestamp: timestamp)
} else {
referenceNode.index = nil
self.insertNodeAtIndex(animated: false, animateAlpha: false, forceAnimateInsertion: false, previousFrame: nil, nodeIndex: index, offsetDirection: offsetDirection, node: referenceNode, layout: previousLayout, apply: { return (nil, {}) }, timestamp: timestamp)
self.addSubnode(referenceNode)
}
} else {
assertionFailure()
}
case let .Remap(mapping):
for node in self.itemNodes {
if let index = node.index {
if let mapped = mapping[index] {
node.index = mapped
}
}
}
case let .Remove(index, offsetDirection):
let apparentFrame = self.itemNodes[index].apparentFrame
let height = apparentFrame.size.height
switch offsetDirection {
case .Up:
if index != self.itemNodes.count - 1 {
for i in index + 1 ..< self.itemNodes.count {
var frame = self.itemNodes[i].frame
frame.origin.y -= height
self.itemNodes[i].frame = frame
}
}
case .Down:
if index != 0 {
for i in (0 ..< index).reversed() {
var frame = self.itemNodes[i].frame
frame.origin.y += height
self.itemNodes[i].frame = frame
}
}
}
self.removeItemNodeAtIndex(index)
case let .UpdateLayout(index, layout, apply):
let node = self.itemNodes[index]
let previousApparentHeight = node.apparentHeight
let previousInsets = node.insets
node.contentSize = layout.contentSize
node.insets = layout.insets
apply().1()
let updatedApparentHeight = node.bounds.size.height
let updatedInsets = node.insets
var offsetRanges = OffsetRanges()
if animated {
if updatedInsets != previousInsets {
node.insets = previousInsets
node.addInsetsAnimationToValue(updatedInsets, duration: insertionAnimationDuration * UIView.animationDurationFactor(), beginAt: timestamp)
}
if abs(updatedApparentHeight - previousApparentHeight) > CGFloat.ulpOfOne {
node.apparentHeight = previousApparentHeight
node.animateFrameTransition(0.0, previousApparentHeight)
node.addApparentHeightAnimation(updatedApparentHeight, duration: insertionAnimationDuration * UIView.animationDurationFactor(), beginAt: timestamp, update: { [weak node] progress, currentValue in
if let node = node {
node.animateFrameTransition(progress, currentValue)
}
})
let insetPart: CGFloat = previousInsets.top - layout.insets.top
if node.rotated {
node.transitionOffset += previousApparentHeight - layout.size.height - insetPart
node.addTransitionOffsetAnimation(0.0, duration: insertionAnimationDuration * UIView.animationDurationFactor(), beginAt: timestamp)
}
} else {
if node.shouldAnimateHorizontalFrameTransition() {
node.addApparentHeightAnimation(updatedApparentHeight, duration: insertionAnimationDuration * UIView.animationDurationFactor(), beginAt: timestamp, update: { [weak node] progress, currentValue in
if let node = node {
node.animateFrameTransition(progress, currentValue)
}
})
}
}
} else {
node.apparentHeight = updatedApparentHeight
let apparentHeightDelta = updatedApparentHeight - previousApparentHeight
if apparentHeightDelta != 0.0 {
var apparentFrame = node.apparentFrame
apparentFrame.origin.y += offsetRanges.offsetForIndex(index)
if apparentFrame.maxY < self.insets.top {
offsetRanges.offset(IndexRange(first: 0, last: index), offset: -apparentHeightDelta)
} else {
offsetRanges.offset(IndexRange(first: index + 1, last: Int.max), offset: apparentHeightDelta)
}
}
}
var index = 0
for itemNode in self.itemNodes {
let offset = offsetRanges.offsetForIndex(index)
if offset != 0.0 {
var frame = itemNode.frame
frame.origin.y += offset
itemNode.frame = frame
}
index += 1
}
}
if self.debugInfo {
//print("operation \(self.itemNodes.map({"\($0.index) \(unsafeAddressOf($0))"}))")
}
}
if self.debugInfo {
//print("replay after \(self.itemNodes.map({"\($0.index) \(unsafeAddressOf($0))"}))")
}
if let scrollToItem = scrollToItem {
self.stopScrolling()
for itemNode in self.itemNodes {
if let index = itemNode.index, index == scrollToItem.index {
let offset: CGFloat
switch scrollToItem.position {
case .Bottom:
offset = (self.visibleSize.height - self.insets.bottom) - itemNode.apparentFrame.maxY + itemNode.scrollPositioningInsets.bottom
case .Top:
offset = self.insets.top - itemNode.apparentFrame.minY - itemNode.scrollPositioningInsets.top
case let .Center(overflow):
let contentAreaHeight = self.visibleSize.height - self.insets.bottom - self.insets.top
if itemNode.apparentFrame.size.height <= contentAreaHeight + CGFloat.ulpOfOne {
offset = self.insets.top + floor(((self.visibleSize.height - self.insets.bottom - self.insets.top) - itemNode.frame.size.height) / 2.0) - itemNode.apparentFrame.minY
} else {
switch overflow {
case .Top:
offset = self.insets.top - itemNode.apparentFrame.minY
case .Bottom:
offset = (self.visibleSize.height - self.insets.bottom) - itemNode.apparentFrame.maxY
}
}
}
for itemNode in self.itemNodes {
var frame = itemNode.frame
frame.origin.y += offset
itemNode.frame = frame
}
break
}
}
} else if let stationaryItemIndex = stationaryItemIndex {
for itemNode in self.itemNodes {
if let index = itemNode.index , index == stationaryItemIndex {
for (previousNode, previousFrame) in previousApparentFrames {
if previousNode === itemNode {
let offset = previousFrame.minY - itemNode.frame.minY
if abs(offset) > CGFloat.ulpOfOne {
for itemNode in self.itemNodes {
var frame = itemNode.frame
frame.origin.y += offset
itemNode.frame = frame
}
}
break
}
}
break
}
}
}
self.insertNodesInBatches(nodes: [], completion: {
self.debugCheckMonotonity()
var sizeAndInsetsOffset: CGFloat = 0.0
var headerNodesTransition: (ContainedViewLayoutTransition, Bool, CGFloat) = (.immediate, false, 0.0)
if let updateSizeAndInsets = updateSizeAndInsets {
if self.insets != updateSizeAndInsets.insets || !self.visibleSize.height.isEqual(to: updateSizeAndInsets.size.height) {
let previousVisibleSize = self.visibleSize
self.visibleSize = updateSizeAndInsets.size
var offsetFix: CGFloat
if self.snapToBottomInsetUntilFirstInteraction {
offsetFix = -updateSizeAndInsets.insets.bottom + self.insets.bottom
} else {
offsetFix = updateSizeAndInsets.insets.top - self.insets.top
}
self.insets = updateSizeAndInsets.insets
self.visibleSize = updateSizeAndInsets.size
for itemNode in self.itemNodes {
let position = itemNode.position
itemNode.position = CGPoint(x: position.x, y: position.y + offsetFix)
}
let (snappedTopInset, snapToBoundsOffset) = self.snapToBounds(snapTopItem: scrollToItem != nil, stackFromBottom: self.stackFromBottom, updateSizeAndInsets: updateSizeAndInsets)
if !snappedTopInset.isZero && (previousVisibleSize.height.isZero || previousApparentFrames.isEmpty) {
offsetFix += snappedTopInset
for itemNode in self.itemNodes {
let position = itemNode.position
itemNode.position = CGPoint(x: position.x, y: position.y + snappedTopInset)
}
}
var completeOffset = offsetFix
if !snapToBoundsOffset.isZero {
self.updateVisibleContentOffset()
}
sizeAndInsetsOffset = offsetFix
completeOffset += snapToBoundsOffset
if updateSizeAndInsets.duration > DBL_EPSILON {
let animation: CABasicAnimation
switch updateSizeAndInsets.curve {
case let .Spring(duration):
headerNodesTransition = (.animated(duration: duration, curve: .spring), false, -completeOffset)
let springAnimation = makeSpringAnimation("sublayerTransform")
springAnimation.fromValue = NSValue(caTransform3D: CATransform3DMakeTranslation(0.0, -completeOffset, 0.0))
springAnimation.toValue = NSValue(caTransform3D: CATransform3DIdentity)
springAnimation.isRemovedOnCompletion = true
let k = Float(UIView.animationDurationFactor())
var speed: Float = 1.0
if k != 0 && k != 1 {
speed = Float(1.0) / k
}
springAnimation.speed = speed * Float(springAnimation.duration / duration)
springAnimation.isAdditive = true
animation = springAnimation
case .Default:
headerNodesTransition = (.animated(duration: updateSizeAndInsets.duration, curve: .easeInOut), false, -completeOffset)
let basicAnimation = CABasicAnimation(keyPath: "sublayerTransform")
basicAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
basicAnimation.duration = updateSizeAndInsets.duration * UIView.animationDurationFactor()
basicAnimation.fromValue = NSValue(caTransform3D: CATransform3DMakeTranslation(0.0, -completeOffset, 0.0))
basicAnimation.toValue = NSValue(caTransform3D: CATransform3DIdentity)
basicAnimation.isRemovedOnCompletion = true
basicAnimation.isAdditive = true
animation = basicAnimation
}
self.layer.add(animation, forKey: nil)
}
} else {
self.visibleSize = updateSizeAndInsets.size
if !self.snapToBounds(snapTopItem: scrollToItem != nil, stackFromBottom: self.stackFromBottom).offset.isZero {
self.updateVisibleContentOffset()
}
}
if let updatedTopItemVerticalOrigin = self.topItemVerticalOrigin(), let previousTopItemVerticalOrigin = previousTopItemVerticalOrigin, animateTopItemVerticalOrigin, !updatedTopItemVerticalOrigin.isEqual(to: previousTopItemVerticalOrigin) {
self.stopScrolling()
let completeOffset = updatedTopItemVerticalOrigin - previousTopItemVerticalOrigin
let duration: Double = 0.4
if let snapshotView = snapshotView {
snapshotView.frame = CGRect(origin: CGPoint(x: 0.0, y: completeOffset), size: snapshotView.frame.size)
self.view.addSubview(snapshotView)
snapshotView.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.12, removeOnCompletion: false, completion: { [weak snapshotView] _ in
snapshotView?.removeFromSuperview()
})
}
let springAnimation = makeSpringAnimation("sublayerTransform")
springAnimation.fromValue = NSValue(caTransform3D: CATransform3DMakeTranslation(0.0, -completeOffset, 0.0))
springAnimation.toValue = NSValue(caTransform3D: CATransform3DIdentity)
springAnimation.isRemovedOnCompletion = true
let k = Float(UIView.animationDurationFactor())
var speed: Float = 1.0
if k != 0 && k != 1 {
speed = Float(1.0) / k
}
springAnimation.speed = speed * Float(springAnimation.duration / duration)
springAnimation.isAdditive = true
self.layer.add(springAnimation, forKey: nil)
} else {
if let snapshotView = snapshotView {
snapshotView.frame = CGRect(origin: CGPoint(x: 0.0, y: 0.0), size: snapshotView.frame.size)
self.view.addSubview(snapshotView)
snapshotView.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.12, removeOnCompletion: false, completion: { [weak snapshotView] _ in
snapshotView?.removeFromSuperview()
})
}
}
let wasIgnoringScrollingEvents = self.ignoreScrollingEvents
self.ignoreScrollingEvents = true
self.scroller.frame = CGRect(origin: CGPoint(), size: self.visibleSize)
self.scroller.contentSize = CGSize(width: self.visibleSize.width, height: infiniteScrollSize * 2.0)
self.lastContentOffset = CGPoint(x: 0.0, y: infiniteScrollSize)
self.scroller.contentOffset = self.lastContentOffset
self.ignoreScrollingEvents = wasIgnoringScrollingEvents
} else {
let (snappedTopInset, snapToBoundsOffset) = self.snapToBounds(snapTopItem: scrollToItem != nil, stackFromBottom: self.stackFromBottom, updateSizeAndInsets: updateSizeAndInsets, scrollToItem: scrollToItem)
if !snappedTopInset.isZero && previousApparentFrames.isEmpty {
let offsetFix = snappedTopInset
for itemNode in self.itemNodes {
let position = itemNode.position
itemNode.position = CGPoint(x: position.x, y: position.y + snappedTopInset)
}
}
if !snapToBoundsOffset.isZero {
self.updateVisibleContentOffset()
}
}
self.updateAccessoryNodes(animated: animated, currentTimestamp: timestamp)
self.updateFloatingAccessoryNodes(animated: animated, currentTimestamp: timestamp)
if let scrollToItem = scrollToItem , scrollToItem.animated {
if self.itemNodes.count != 0 {
var offset: CGFloat?
var temporaryPreviousNodes: [ListViewItemNode] = []
var previousUpperBound: CGFloat?
var previousLowerBound: CGFloat?
for (previousNode, previousFrame) in previousApparentFrames {
if previousNode.supernode == nil {
temporaryPreviousNodes.append(previousNode)
previousNode.frame = previousFrame
if previousUpperBound == nil || previousUpperBound! > previousFrame.minY {
previousUpperBound = previousFrame.minY
}
if previousLowerBound == nil || previousLowerBound! < previousFrame.maxY {
previousLowerBound = previousFrame.maxY
}
} else {
if previousNode.canBeUsedAsScrollToItemAnchor {
offset = previousNode.apparentFrame.minY - previousFrame.minY
}
}
}
if offset == nil {
let updatedUpperBound = self.itemNodes[0].apparentFrame.minY
let updatedLowerBound = max(self.itemNodes[self.itemNodes.count - 1].apparentFrame.maxY, self.visibleSize.height)
switch scrollToItem.directionHint {
case .Up:
offset = updatedLowerBound - (previousUpperBound ?? 0.0)
case .Down:
offset = updatedUpperBound - (previousLowerBound ?? self.visibleSize.height)
}
}
if let offsetValue = offset {
offset = offsetValue - sizeAndInsetsOffset
}
var previousItemHeaderNodes: [ListViewItemHeaderNode] = []
let offsetOrZero: CGFloat = offset ?? 0.0
switch scrollToItem.curve {
case let .Spring(duration):
headerNodesTransition = (.animated(duration: duration, curve: .spring), headerNodesTransition.1, headerNodesTransition.2 - offsetOrZero)
case .Default:
headerNodesTransition = (.animated(duration: 0.5, curve: .easeInOut), true, headerNodesTransition.2 - offsetOrZero)
}
for (_, headerNode) in self.itemHeaderNodes {
previousItemHeaderNodes.append(headerNode)
}
self.updateItemHeaders(headerNodesTransition, animateInsertion: animated || !requestItemInsertionAnimationsIndices.isEmpty)
if let offset = offset , abs(offset) > CGFloat.ulpOfOne {
let lowestHeaderNode = self.lowestHeaderNode()
for itemNode in temporaryPreviousNodes {
itemNode.frame = itemNode.frame.offsetBy(dx: 0.0, dy: offset)
if let lowestHeaderNode = lowestHeaderNode {
self.insertSubnode(itemNode, belowSubnode: lowestHeaderNode)
} else {
self.addSubnode(itemNode)
}
}
var temporaryHeaderNodes: [ListViewItemHeaderNode] = []
for headerNode in previousItemHeaderNodes {
if headerNode.supernode == nil {
headerNode.frame = headerNode.frame.offsetBy(dx: 0.0, dy: offset)
temporaryHeaderNodes.append(headerNode)
self.addSubnode(headerNode)
}
}
let animation: CABasicAnimation
switch scrollToItem.curve {
case let .Spring(duration):
let springAnimation = makeSpringAnimation("sublayerTransform")
springAnimation.fromValue = NSValue(caTransform3D: CATransform3DMakeTranslation(0.0, -offset, 0.0))
springAnimation.toValue = NSValue(caTransform3D: CATransform3DIdentity)
springAnimation.isRemovedOnCompletion = true
springAnimation.isAdditive = true
springAnimation.fillMode = kCAFillModeForwards
let k = Float(UIView.animationDurationFactor())
var speed: Float = 1.0
if k != 0 && k != 1 {
speed = Float(1.0) / k
}
springAnimation.speed = speed * Float(springAnimation.duration / duration)
animation = springAnimation
case .Default:
let basicAnimation = CABasicAnimation(keyPath: "sublayerTransform")
basicAnimation.timingFunction = CAMediaTimingFunction(controlPoints: 0.33, 0.52, 0.25, 0.99)
//basicAnimation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut)
basicAnimation.duration = 0.5 * UIView.animationDurationFactor()
basicAnimation.fromValue = NSValue(caTransform3D: CATransform3DMakeTranslation(0.0, -offset, 0.0))
basicAnimation.toValue = NSValue(caTransform3D: CATransform3DIdentity)
basicAnimation.isRemovedOnCompletion = true
basicAnimation.isAdditive = true
animation = basicAnimation
}
animation.completion = { _ in
for itemNode in temporaryPreviousNodes {
itemNode.removeFromSupernode()
ASDeallocQueue.sharedDeallocation().releaseObject(inBackground: itemNode)
}
for headerNode in temporaryHeaderNodes {
headerNode.removeFromSupernode()
ASDeallocQueue.sharedDeallocation().releaseObject(inBackground: headerNode)
}
}
self.layer.add(animation, forKey: nil)
} else {
for itemNode in temporaryPreviousNodes {
ASDeallocQueue.sharedDeallocation().releaseObject(inBackground: itemNode)
}
}
}
self.updateScroller()
self.setNeedsAnimations()
self.updateVisibleContentOffset()
if self.debugInfo {
let delta = CACurrentMediaTime() - timestamp
//print("replayOperations \(delta * 1000.0) ms")
}
completion()
} else {
self.updateItemHeaders(headerNodesTransition, animateInsertion: animated || !requestItemInsertionAnimationsIndices.isEmpty)
if animated {
self.setNeedsAnimations()
}
self.updateScroller()
self.updateVisibleContentOffset()
if self.debugInfo {
let delta = CACurrentMediaTime() - timestamp
//print("replayOperations \(delta * 1000.0) ms")
}
for (previousNode, _) in previousApparentFrames {
if previousNode.supernode == nil {
ASDeallocQueue.sharedDeallocation().releaseObject(inBackground: previousNode)
}
}
completion()
}
})
}
private func insertNodesInBatches(nodes: [ASDisplayNode], completion: () -> Void) {
if nodes.count == 0 {
completion()
} else {
for node in nodes {
self.addSubnode(node)
}
completion()
}
}
private func debugCheckMonotonity() {
if self.debugInfo {
var previousMaxY: CGFloat?
for node in self.itemNodes {
if let previousMaxY = previousMaxY , abs(previousMaxY - node.apparentFrame.minY) > CGFloat.ulpOfOne {
print("monotonity violated")
break
}
previousMaxY = node.apparentFrame.maxY
}
}
}
private func removeItemNodeAtIndex(_ index: Int) {
let node = self.itemNodes[index]
self.itemNodes.remove(at: index)
node.removeFromSupernode()
node.accessoryItemNode?.removeFromSupernode()
node.accessoryItemNode = nil
node.headerAccessoryItemNode?.removeFromSupernode()
node.headerAccessoryItemNode = nil
}
private func updateItemHeaders(_ transition: (ContainedViewLayoutTransition, Bool, CGFloat) = (.immediate, false, 0.0), animateInsertion: Bool = false) {
let upperDisplayBound = self.insets.top
let lowerDisplayBound = self.visibleSize.height - self.insets.bottom
var visibleHeaderNodes = Set<Int64>()
let flashing = self.headerItemsAreFlashing()
let addHeader: (_ id: Int64, _ upperBound: CGFloat, _ lowerBound: CGFloat, _ item: ListViewItemHeader, _ hasValidNodes: Bool) -> Void = { id, upperBound, lowerBound, item, hasValidNodes in
let itemHeaderHeight: CGFloat = item.height
let headerFrame: CGRect
let stickLocationDistanceFactor: CGFloat
let stickLocationDistance: CGFloat
switch item.stickDirection {
case .top:
headerFrame = CGRect(origin: CGPoint(x: 0.0, y: min(max(upperDisplayBound, upperBound), lowerBound - itemHeaderHeight)), size: CGSize(width: self.visibleSize.width, height: itemHeaderHeight))
stickLocationDistance = 0.0
stickLocationDistanceFactor = 0.0
case .bottom:
headerFrame = CGRect(origin: CGPoint(x: 0.0, y: max(upperBound, min(lowerBound, lowerDisplayBound) - itemHeaderHeight)), size: CGSize(width: self.visibleSize.width, height: itemHeaderHeight))
stickLocationDistance = lowerBound - headerFrame.maxY
stickLocationDistanceFactor = max(0.0, min(1.0, stickLocationDistance / itemHeaderHeight))
}
visibleHeaderNodes.insert(id)
if let headerNode = self.itemHeaderNodes[id] {
switch transition.0 {
case .immediate:
headerNode.frame = headerFrame
case let .animated(duration, curve):
let previousFrame = headerNode.frame
headerNode.frame = headerFrame
var offset = headerFrame.minY - previousFrame.minY + transition.2
if headerNode.isRotated {
offset = -offset
}
switch curve {
case .spring:
transition.0.animateOffsetAdditive(node: headerNode, offset: offset)
case .easeInOut:
if transition.1 {
headerNode.layer.animateBoundsOriginYAdditive(from: offset, to: 0.0, duration: duration, mediaTimingFunction: CAMediaTimingFunction(controlPoints: 0.33, 0.52, 0.25, 0.99))
} else {
headerNode.layer.animateBoundsOriginYAdditive(from: offset, to: 0.0, duration: duration, mediaTimingFunction: CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut))
}
}
}
headerNode.updateInternalStickLocationDistanceFactor(stickLocationDistanceFactor, animated: true)
headerNode.internalStickLocationDistance = stickLocationDistance
if !hasValidNodes && !headerNode.alpha.isZero {
headerNode.alpha = 0.0
if animateInsertion {
headerNode.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.2)
headerNode.layer.animateScale(from: 1.0, to: 0.2, duration: 0.2)
}
} else if hasValidNodes && headerNode.alpha.isZero {
headerNode.alpha = 1.0
if animateInsertion {
headerNode.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.2)
headerNode.layer.animateScale(from: 0.2, to: 1.0, duration: 0.2)
}
}
headerNode.updateStickDistanceFactor(stickLocationDistanceFactor, transition: transition.0)
} else {
let headerNode = item.node()
headerNode.updateFlashingOnScrolling(flashing, animated: false)
headerNode.frame = headerFrame
headerNode.updateInternalStickLocationDistanceFactor(stickLocationDistanceFactor, animated: false)
self.itemHeaderNodes[id] = headerNode
self.addSubnode(headerNode)
if animateInsertion {
headerNode.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.3)
headerNode.layer.animateScale(from: 0.2, to: 1.0, duration: 0.3)
}
headerNode.updateStickDistanceFactor(stickLocationDistanceFactor, transition: .immediate)
}
}
var previousHeader: (Int64, CGFloat, CGFloat, ListViewItemHeader, Bool)?
for itemNode in self.itemNodes {
let itemFrame = itemNode.apparentFrame
if let itemHeader = itemNode.header() {
if let (previousHeaderId, previousUpperBound, previousLowerBound, previousHeaderItem, hasValidNodes) = previousHeader {
if previousHeaderId == itemHeader.id {
previousHeader = (previousHeaderId, previousUpperBound, itemFrame.maxY, previousHeaderItem, hasValidNodes || itemNode.index != nil)
} else {
addHeader(previousHeaderId, previousUpperBound, previousLowerBound, previousHeaderItem, hasValidNodes)
previousHeader = (itemHeader.id, itemFrame.minY, itemFrame.maxY, itemHeader, itemNode.index != nil)
}
} else {
previousHeader = (itemHeader.id, itemFrame.minY, itemFrame.maxY, itemHeader, itemNode.index != nil)
}
} else {
if let (previousHeaderId, previousUpperBound, previousLowerBound, previousHeaderItem, hasValidNodes) = previousHeader {
addHeader(previousHeaderId, previousUpperBound, previousLowerBound, previousHeaderItem, hasValidNodes)
}
previousHeader = nil
}
}
if let (previousHeaderId, previousUpperBound, previousLowerBound, previousHeaderItem, hasValidNodes) = previousHeader {
addHeader(previousHeaderId, previousUpperBound, previousLowerBound, previousHeaderItem, hasValidNodes)
}
var currentIds = Set(self.itemHeaderNodes.keys)
for id in currentIds.subtracting(visibleHeaderNodes) {
if let headerNode = self.itemHeaderNodes.removeValue(forKey: id) {
headerNode.removeFromSupernode()
}
}
}
private func updateAccessoryNodes(animated: Bool, currentTimestamp: Double) {
var index = -1
let count = self.itemNodes.count
for itemNode in self.itemNodes {
index += 1
guard let itemNodeIndex = itemNode.index else {
continue
}
if let accessoryItem = self.items[itemNodeIndex].accessoryItem {
let previousItem: ListViewItem? = itemNodeIndex == 0 ? nil : self.items[itemNodeIndex - 1]
let previousAccessoryItem = previousItem?.accessoryItem
if (previousAccessoryItem == nil || !previousAccessoryItem!.isEqualToItem(accessoryItem)) {
if itemNode.accessoryItemNode == nil {
var didStealAccessoryNode = false
if index != count - 1 {
for i in index + 1 ..< count {
let nextItemNode = self.itemNodes[i]
if let nextItemNodeIndex = nextItemNode.index {
let nextItem = self.items[nextItemNodeIndex]
if let nextAccessoryItem = nextItem.accessoryItem , nextAccessoryItem.isEqualToItem(accessoryItem) {
if let nextAccessoryItemNode = nextItemNode.accessoryItemNode {
didStealAccessoryNode = true
var previousAccessoryItemNodeOrigin = nextAccessoryItemNode.frame.origin
let previousParentOrigin = nextItemNode.frame.origin
previousAccessoryItemNodeOrigin.x += previousParentOrigin.x
previousAccessoryItemNodeOrigin.y += previousParentOrigin.y
previousAccessoryItemNodeOrigin.y -= nextItemNode.bounds.origin.y
previousAccessoryItemNodeOrigin.y -= nextAccessoryItemNode.transitionOffset.y
nextAccessoryItemNode.transitionOffset = CGPoint()
nextAccessoryItemNode.removeFromSupernode()
itemNode.addSubnode(nextAccessoryItemNode)
itemNode.accessoryItemNode = nextAccessoryItemNode
self.itemNodes[i].accessoryItemNode = nil
var updatedAccessoryItemNodeOrigin = nextAccessoryItemNode.frame.origin
let updatedParentOrigin = itemNode.frame.origin
updatedAccessoryItemNodeOrigin.x += updatedParentOrigin.x
updatedAccessoryItemNodeOrigin.y += updatedParentOrigin.y
updatedAccessoryItemNodeOrigin.y -= itemNode.bounds.origin.y
let deltaHeight = itemNode.frame.size.height - nextItemNode.frame.size.height
nextAccessoryItemNode.animateTransitionOffset(CGPoint(x: 0.0, y: updatedAccessoryItemNodeOrigin.y - previousAccessoryItemNodeOrigin.y - deltaHeight), beginAt: currentTimestamp, duration: insertionAnimationDuration * UIView.animationDurationFactor(), curve: listViewAnimationCurveSystem)
}
} else {
break
}
}
}
}
if !didStealAccessoryNode {
let accessoryNode = accessoryItem.node()
itemNode.addSubnode(accessoryNode)
itemNode.accessoryItemNode = accessoryNode
}
}
} else {
itemNode.accessoryItemNode?.removeFromSupernode()
itemNode.accessoryItemNode = nil
}
}
if let headerAccessoryItem = self.items[itemNodeIndex].headerAccessoryItem {
let previousItem: ListViewItem? = itemNodeIndex == 0 ? nil : self.items[itemNodeIndex - 1]
let previousHeaderAccessoryItem = previousItem?.headerAccessoryItem
if (previousHeaderAccessoryItem == nil || !previousHeaderAccessoryItem!.isEqualToItem(headerAccessoryItem)) {
if itemNode.headerAccessoryItemNode == nil {
var didStealHeaderAccessoryNode = false
if index != count - 1 {
for i in index + 1 ..< count {
let nextItemNode = self.itemNodes[i]
if let nextItemNodeIndex = nextItemNode.index {
let nextItem = self.items[nextItemNodeIndex]
if let nextHeaderAccessoryItem = nextItem.headerAccessoryItem , nextHeaderAccessoryItem.isEqualToItem(headerAccessoryItem) {
if let nextHeaderAccessoryItemNode = nextItemNode.headerAccessoryItemNode {
didStealHeaderAccessoryNode = true
var previousHeaderAccessoryItemNodeOrigin = nextHeaderAccessoryItemNode.frame.origin
let previousParentOrigin = nextItemNode.frame.origin
previousHeaderAccessoryItemNodeOrigin.x += previousParentOrigin.x
previousHeaderAccessoryItemNodeOrigin.y += previousParentOrigin.y
previousHeaderAccessoryItemNodeOrigin.y -= nextItemNode.bounds.origin.y
previousHeaderAccessoryItemNodeOrigin.y -= nextHeaderAccessoryItemNode.transitionOffset.y
nextHeaderAccessoryItemNode.transitionOffset = CGPoint()
nextHeaderAccessoryItemNode.removeFromSupernode()
itemNode.addSubnode(nextHeaderAccessoryItemNode)
itemNode.headerAccessoryItemNode = nextHeaderAccessoryItemNode
self.itemNodes[i].headerAccessoryItemNode = nil
var updatedHeaderAccessoryItemNodeOrigin = nextHeaderAccessoryItemNode.frame.origin
let updatedParentOrigin = itemNode.frame.origin
updatedHeaderAccessoryItemNodeOrigin.x += updatedParentOrigin.x
updatedHeaderAccessoryItemNodeOrigin.y += updatedParentOrigin.y
updatedHeaderAccessoryItemNodeOrigin.y -= itemNode.bounds.origin.y
let deltaHeight = itemNode.frame.size.height - nextItemNode.frame.size.height
nextHeaderAccessoryItemNode.animateTransitionOffset(CGPoint(x: 0.0, y: updatedHeaderAccessoryItemNodeOrigin.y - previousHeaderAccessoryItemNodeOrigin.y - deltaHeight), beginAt: currentTimestamp, duration: insertionAnimationDuration * UIView.animationDurationFactor(), curve: listViewAnimationCurveSystem)
}
} else {
break
}
}
}
}
if !didStealHeaderAccessoryNode {
let headerAccessoryNode = headerAccessoryItem.node()
itemNode.addSubnode(headerAccessoryNode)
itemNode.headerAccessoryItemNode = headerAccessoryNode
}
}
} else {
itemNode.headerAccessoryItemNode?.removeFromSupernode()
itemNode.headerAccessoryItemNode = nil
}
}
}
}
private func updateFloatingAccessoryNodes(animated: Bool, currentTimestamp: Double) {
var previousFloatingAccessoryItem: ListViewAccessoryItem?
for itemNode in self.itemNodes {
if let index = itemNode.index, let floatingAccessoryItem = self.items[index].floatingAccessoryItem {
if itemNode.floatingAccessoryItemNode == nil {
let floatingAccessoryItemNode = floatingAccessoryItem.node()
itemNode.floatingAccessoryItemNode = floatingAccessoryItemNode
itemNode.addSubnode(floatingAccessoryItemNode)
}
} else {
itemNode.floatingAccessoryItemNode?.removeFromSupernode()
itemNode.floatingAccessoryItemNode = nil
}
}
}
private func enqueueUpdateVisibleItems() {
if !self.enqueuedUpdateVisibleItems {
self.enqueuedUpdateVisibleItems = true
self.transactionQueue.addTransaction({ [weak self] completion in
if let strongSelf = self {
strongSelf.transactionOffset = 0.0
strongSelf.updateVisibleItemsTransaction(completion: {
var repeatUpdate = false
if let strongSelf = self {
repeatUpdate = abs(strongSelf.transactionOffset) > 0.00001
strongSelf.transactionOffset = 0.0
strongSelf.enqueuedUpdateVisibleItems = false
}
completion()
if repeatUpdate {
strongSelf.enqueueUpdateVisibleItems()
}
})
}
})
}
}
private func updateVisibleItemsTransaction(completion: @escaping (Void) -> Void) {
if self.items.count == 0 && self.itemNodes.count == 0 {
completion()
return
}
var i = 0
while i < self.itemNodes.count {
let node = self.itemNodes[i]
if node.index == nil && node.apparentHeight <= CGFloat.ulpOfOne {
self.removeItemNodeAtIndex(i)
ASDeallocQueue.sharedDeallocation().releaseObject(inBackground: node)
} else {
i += 1
}
}
let state = self.currentState()
self.async {
self.fillMissingNodes(synchronous: false, animated: false, inputAnimatedInsertIndices: [], insertDirectionHints: [:], inputState: state, inputPreviousNodes: [:], inputOperations: []) { state, operations in
var updatedState = state
var updatedOperations = operations
updatedState.removeInvisibleNodes(&updatedOperations)
self.dispatchOnVSync {
self.replayOperations(animated: false, animateAlpha: false, animateTopItemVerticalOrigin: false, operations: updatedOperations, requestItemInsertionAnimationsIndices: Set(), scrollToItem: nil, updateSizeAndInsets: nil, stationaryItemIndex: nil, updateOpaqueState: nil, completion: completion)
}
}
}
}
private func updateVisibleItemRange(force: Bool = false) {
let currentRange = self.immediateDisplayedItemRange()
if currentRange != self.displayedItemRange || force {
self.displayedItemRange = currentRange
self.displayedItemRangeChanged(currentRange, self.opaqueTransactionState)
}
}
private func immediateDisplayedItemRange() -> ListViewDisplayedItemRange {
var loadedRange: ListViewItemRange?
var visibleRange: ListViewItemRange?
if self.itemNodes.count != 0 {
var firstIndex: (nodeIndex: Int, index: Int)?
var lastIndex: (nodeIndex: Int, index: Int)?
var i = 0
while i < self.itemNodes.count {
if let index = self.itemNodes[i].index {
firstIndex = (i, index)
break
}
i += 1
}
i = self.itemNodes.count - 1
while i >= 0 {
if let index = self.itemNodes[i].index {
lastIndex = (i, index)
break
}
i -= 1
}
if let firstIndex = firstIndex, let lastIndex = lastIndex {
var firstVisibleIndex: Int?
for i in firstIndex.nodeIndex ... lastIndex.nodeIndex {
if let index = self.itemNodes[i].index {
let frame = self.itemNodes[i].apparentFrame
if frame.maxY >= self.insets.top && frame.minY < self.visibleSize.height + self.insets.bottom {
firstVisibleIndex = index
break
}
}
}
if let firstVisibleIndex = firstVisibleIndex {
var lastVisibleIndex: Int?
for i in (firstIndex.nodeIndex ... lastIndex.nodeIndex).reversed() {
if let index = self.itemNodes[i].index {
let frame = self.itemNodes[i].apparentFrame
if frame.maxY >= self.insets.top && frame.minY < self.visibleSize.height - self.insets.bottom {
lastVisibleIndex = index
break
}
}
}
if let lastVisibleIndex = lastVisibleIndex {
visibleRange = ListViewItemRange(firstIndex: firstVisibleIndex, lastIndex: lastVisibleIndex)
}
}
loadedRange = ListViewItemRange(firstIndex: firstIndex.index, lastIndex: lastIndex.index)
}
}
return ListViewDisplayedItemRange(loadedRange: loadedRange, visibleRange: visibleRange)
}
private func updateAnimations() {
self.inVSync = true
let actionsForVSync = self.actionsForVSync
self.actionsForVSync.removeAll()
for action in actionsForVSync {
action()
}
self.inVSync = false
let timestamp: Double = CACurrentMediaTime()
var continueAnimations = false
if !self.actionsForVSync.isEmpty {
continueAnimations = true
}
var i = 0
var animationCount = self.animations.count
while i < animationCount {
let animation = self.animations[i]
animation.applyAt(timestamp)
if animation.completeAt(timestamp) {
animations.remove(at: i)
animationCount -= 1
i -= 1
} else {
continueAnimations = true
}
i += 1
}
var offsetRanges = OffsetRanges()
var requestUpdateVisibleItems = false
var index = 0
while index < self.itemNodes.count {
let itemNode = self.itemNodes[index]
let previousApparentHeight = itemNode.apparentHeight
if itemNode.animate(timestamp) {
continueAnimations = true
}
let updatedApparentHeight = itemNode.apparentHeight
let apparentHeightDelta = updatedApparentHeight - previousApparentHeight
if abs(apparentHeightDelta) > CGFloat.ulpOfOne {
if itemNode.apparentFrame.maxY < self.insets.top + CGFloat.ulpOfOne {
offsetRanges.offset(IndexRange(first: 0, last: index), offset: -apparentHeightDelta)
} else {
offsetRanges.offset(IndexRange(first: index + 1, last: Int.max), offset: apparentHeightDelta)
}
}
if itemNode.index == nil && updatedApparentHeight <= CGFloat.ulpOfOne {
requestUpdateVisibleItems = true
}
index += 1
}
for (_, headerNode) in self.itemHeaderNodes {
if headerNode.animate(timestamp) {
continueAnimations = true
}
}
if !offsetRanges.offsets.isEmpty {
requestUpdateVisibleItems = true
var index = 0
for itemNode in self.itemNodes {
let offset = offsetRanges.offsetForIndex(index)
if offset != 0.0 {
var position = itemNode.position
position.y += offset
itemNode.position = position
}
index += 1
}
if !self.snapToBounds(snapTopItem: false, stackFromBottom: self.stackFromBottom).offset.isZero {
self.updateVisibleContentOffset()
}
}
self.debugCheckMonotonity()
if !continueAnimations {
self.pauseAnimations()
}
if requestUpdateVisibleItems {
self.enqueueUpdateVisibleItems()
}
}
override open func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
self.touchesPosition = touches.first!.location(in: self.view)
self.selectionTouchLocation = touches.first!.location(in: self.view)
self.selectionTouchDelayTimer?.invalidate()
let timer = Timer(timeInterval: 0.08, target: ListViewTimerProxy { [weak self] in
if let strongSelf = self , strongSelf.selectionTouchLocation != nil {
strongSelf.clearHighlightAnimated(false)
if let index = strongSelf.itemIndexAtPoint(strongSelf.touchesPosition) {
if strongSelf.items[index].selectable {
strongSelf.highlightedItemIndex = index
for itemNode in strongSelf.itemNodes {
if itemNode.index == index && itemNode.canBeSelected {
if true { //!(itemNode.hitTest(CGPoint(x: strongSelf.touchesPosition.x - itemNode.frame.minX, y: strongSelf.touchesPosition.y - itemNode.frame.minY), with: event) is UIControl) {
if !itemNode.isLayerBacked {
strongSelf.view.bringSubview(toFront: itemNode.view)
for (_, headerNode) in strongSelf.itemHeaderNodes {
strongSelf.view.bringSubview(toFront: headerNode.view)
}
}
itemNode.setHighlighted(true, animated: false)
}
break
}
}
}
}
}
}, selector: #selector(ListViewTimerProxy.timerEvent), userInfo: nil, repeats: false)
self.selectionTouchDelayTimer = timer
RunLoop.main.add(timer, forMode: RunLoopMode.commonModes)
super.touchesBegan(touches, with: event)
self.updateScroller()
}
public func clearHighlightAnimated(_ animated: Bool) {
if let highlightedItemIndex = self.highlightedItemIndex {
for itemNode in self.itemNodes {
if itemNode.index == highlightedItemIndex {
itemNode.setHighlighted(false, animated: animated)
break
}
}
}
self.highlightedItemIndex = nil
}
private func itemIndexAtPoint(_ point: CGPoint) -> Int? {
for itemNode in self.itemNodes {
if itemNode.apparentFrame.contains(point) {
return itemNode.index
}
}
return nil
}
public func forEachItemNode(_ f: (ASDisplayNode) -> Void) {
for itemNode in self.itemNodes {
if itemNode.index != nil {
f(itemNode)
}
}
}
public func ensureItemNodeVisible(_ node: ListViewItemNode) {
if let index = node.index {
if node.frame.minY < self.insets.top {
self.transaction(deleteIndices: [], insertIndicesAndItems: [], updateIndicesAndItems: [], options: ListViewDeleteAndInsertOptions(), scrollToItem: ListViewScrollToItem(index: index, position: ListViewScrollPosition.Top, animated: true, curve: ListViewAnimationCurve.Default, directionHint: ListViewScrollToItemDirectionHint.Up), updateSizeAndInsets: nil, stationaryItemRange: nil, updateOpaqueState: nil, completion: { _ in })
} else if node.frame.maxY > self.visibleSize.height - self.insets.bottom {
self.transaction(deleteIndices: [], insertIndicesAndItems: [], updateIndicesAndItems: [], options: ListViewDeleteAndInsertOptions(), scrollToItem: ListViewScrollToItem(index: index, position: ListViewScrollPosition.Bottom, animated: true, curve: ListViewAnimationCurve.Default, directionHint: ListViewScrollToItemDirectionHint.Down), updateSizeAndInsets: nil, stationaryItemRange: nil, updateOpaqueState: nil, completion: { _ in })
}
}
}
override open func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
if let selectionTouchLocation = self.selectionTouchLocation {
let location = touches.first!.location(in: self.view)
let distance = CGPoint(x: selectionTouchLocation.x - location.x, y: selectionTouchLocation.y - location.y)
let maxMovementDistance: CGFloat = 4.0
if distance.x * distance.x + distance.y * distance.y > maxMovementDistance * maxMovementDistance {
self.selectionTouchLocation = nil
self.selectionTouchDelayTimer?.invalidate()
self.selectionTouchDelayTimer = nil
self.clearHighlightAnimated(false)
}
}
super.touchesMoved(touches, with: event)
}
override open func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
if let selectionTouchLocation = self.selectionTouchLocation {
let index = self.itemIndexAtPoint(selectionTouchLocation)
if index != self.highlightedItemIndex {
self.clearHighlightAnimated(false)
}
if let index = index {
if self.items[index].selectable {
self.highlightedItemIndex = index
for itemNode in self.itemNodes {
if itemNode.index == index {
if itemNode.canBeSelected {
if !itemNode.isLayerBacked {
self.view.bringSubview(toFront: itemNode.view)
for (_, headerNode) in self.itemHeaderNodes {
self.view.bringSubview(toFront: headerNode.view)
}
}
itemNode.setHighlighted(true, animated: false)
} else {
self.highlightedItemIndex = nil
}
break
}
}
}
}
}
if let highlightedItemIndex = self.highlightedItemIndex {
self.items[highlightedItemIndex].selected(listView: self)
}
self.selectionTouchLocation = nil
super.touchesEnded(touches, with: event)
}
override open func touchesCancelled(_ touches: Set<UITouch>?, with event: UIEvent?) {
self.selectionTouchLocation = nil
self.selectionTouchDelayTimer?.invalidate()
self.selectionTouchDelayTimer = nil
self.clearHighlightAnimated(false)
super.touchesCancelled(touches, with: event)
}
@objc func trackingGesture(_ recognizer: UIPanGestureRecognizer) {
switch recognizer.state {
case .began:
self.isTracking = true
break
case .changed:
self.touchesPosition = recognizer.location(in: self.view)
case .ended, .cancelled:
self.isTracking = false
default:
break
}
}
public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
return true
}
public func withTransaction(_ f: @escaping () -> Void) {
self.transactionQueue.addTransaction { completion in
f()
completion()
}
}
fileprivate func internalHitTest(_ point: CGPoint, with event: UIEvent?) -> Bool {
if self.limitHitTestToNodes {
var foundHit = false
for itemNode in self.itemNodes {
if itemNode.frame.contains(point) {
foundHit = true
break
}
}
if !foundHit {
return false
}
}
return true
}
}