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ListView: added generalScrollDirectionUpdated

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Peter 2019-03-02 00:01:24 +04:00
parent 124cc24059
commit 798e2dda42
1 changed files with 19 additions and 0 deletions
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19
Display/ListView.swift
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@ -116,6 +116,11 @@ public struct ListViewKeepTopItemOverscrollBackground {
}
}
public enum GeneralScrollDirection {
case up
case down
}
open class ListView: ASDisplayNode, UIScrollViewAccessibilityDelegate, UIGestureRecognizerDelegate {
private final let scroller: ListViewScroller
private final var visibleSize: CGSize = CGSize()
@ -228,6 +233,9 @@ open class ListView: ASDisplayNode, UIScrollViewAccessibilityDelegate, UIGesture
public final var beganInteractiveDragging: () -> Void = { }
public final var didEndScrolling: (() -> Void)?
private var currentGeneralScrollDirection: GeneralScrollDirection?
public final var generalScrollDirectionUpdated: (GeneralScrollDirection) -> Void = { _ in }
public final var reorderItem: (Int, Int, Any?) -> Signal<Bool, NoError> = { _, _, _ in return .single(false) }
private final var animations: [ListViewAnimation] = []
@ -602,6 +610,8 @@ open class ListView: ASDisplayNode, UIScrollViewAccessibilityDelegate, UIGesture
self.updateScrollViewDidScroll(scrollView, synchronous: false)
}
private var generalAccumulatedDeltaY: CGFloat = 0.0
private func updateScrollViewDidScroll(_ scrollView: UIScrollView, synchronous: Bool) {
if self.ignoreScrollingEvents || scroller !== self.scroller {
return
@ -611,6 +621,15 @@ open class ListView: ASDisplayNode, UIScrollViewAccessibilityDelegate, UIGesture
//CATransaction.setDisableActions(true)
let deltaY = scrollView.contentOffset.y - self.lastContentOffset.y
self.generalAccumulatedDeltaY += deltaY
if abs(self.generalAccumulatedDeltaY) > 14.0 {
let direction: GeneralScrollDirection = self.generalAccumulatedDeltaY < 0 ? .up : .down
self.generalAccumulatedDeltaY = 0.0
if self.currentGeneralScrollDirection != direction {
self.currentGeneralScrollDirection = direction
self.generalScrollDirectionUpdated(direction)
}
}
self.lastContentOffset = scrollView.contentOffset
if !self.lastContentOffsetTimestamp.isZero {