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ListView: added visible fraction value for visibility property

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This commit is contained in:
Ilya Laktyushin 2019-02-18 16:00:52 +04:00
parent 6e0355b632
commit 4658244e44
2 changed files with 6 additions and 5 deletions
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5
Display/ListView.swift
View File

@ -2973,8 +2973,9 @@ open class ListView: ASDisplayNode, UIScrollViewAccessibilityDelegate, UIGesture
var visibility: ListViewItemNodeVisibility = .none var visibility: ListViewItemNodeVisibility = .none
if visibilityRect.intersects(itemFrame) { if visibilityRect.intersects(itemFrame) {
let itemContentFrame = itemNode.apparentContentFrame let itemContentFrame = itemNode.apparentContentFrame
let full = itemContentFrame.minY >= visibilityRect.minY && itemContentFrame.maxY <= visibilityRect.maxY let intersection = itemContentFrame.intersection(visibilityRect)
visibility = .visible(full) let fraction = intersection.height / itemContentFrame.height
visibility = .visible(fraction)
} }
var updateVisibility = false var updateVisibility = false
if !onlyPositive { if !onlyPositive {

6
Display/ListViewItemNode.swift
View File

@ -52,7 +52,7 @@ public struct ListViewItemNodeLayout {
public enum ListViewItemNodeVisibility: Equatable { public enum ListViewItemNodeVisibility: Equatable {
case none case none
case visible(Bool) case visible(CGFloat)
public static func ==(lhs: ListViewItemNodeVisibility, rhs: ListViewItemNodeVisibility) -> Bool { public static func ==(lhs: ListViewItemNodeVisibility, rhs: ListViewItemNodeVisibility) -> Bool {
switch lhs { switch lhs {
@ -62,8 +62,8 @@ public enum ListViewItemNodeVisibility: Equatable {
} else { } else {
return false return false
} }
case let .visible(full): case let .visible(fraction):
if case .visible(full) = rhs { if case .visible(fraction) = rhs {
return true return true
} else { } else {
return false return false