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Code Issues 95 Packages Projects Releases 10 Wiki Activity

Allow custom views to consume ListSnapshot diffable data

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This commit is contained in:
John Estropia
2019-12-17 19:45:53 +09:00
parent 9a19919392
commit eef1c99f11
13 changed files with 764 additions and 536 deletions
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74
Sources/Internals.DiffableDataUIDispatcher.swift
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@@ -52,7 +52,17 @@ extension Internals {
self.dataStack = dataStack
}
func apply<View: AnyObject>(_ snapshot: DiffableDataSourceSnapshot, view: View?, animatingDifferences: Bool, performUpdates: @escaping (View, StagedChangeset<[Internals.DiffableDataSourceSnapshot.Section]>, @escaping ([Internals.DiffableDataSourceSnapshot.Section]) -> Void) -> Void) {
func apply<Target: DiffableDataSource.Target>(
_ snapshot: DiffableDataSourceSnapshot,
target: Target?,
animatingDifferences: Bool,
performUpdates: @escaping (
Target,
StagedChangeset<[Internals.DiffableDataSourceSnapshot.Section]>,
@escaping ([Internals.DiffableDataSourceSnapshot.Section]) -> Void
) -> Void,
completion: @escaping () -> Void
) {
self.dispatcher.dispatch { [weak self] in
@@ -64,36 +74,42 @@ extension Internals {
self.currentSnapshot = snapshot
let newSections = snapshot.sections
guard let view = view else {
guard let target = target else {
return self.sections = newSections
self.sections = newSections
return
}
let performDiffingUpdates: () -> Void = {
let changeset = StagedChangeset(source: self.sections, target: newSections)
performUpdates(view, changeset) { sections in
performUpdates(target, changeset) { sections in
self.sections = sections
}
}
#if canImport(QuartzCore)
CATransaction.begin()
CATransaction.setCompletionBlock(completion)
if !animatingDifferences {
CATransaction.begin()
CATransaction.setDisableActions(true)
performDiffingUpdates()
CATransaction.commit()
return
}
#endif
performDiffingUpdates()
CATransaction.commit()
#else
performDiffingUpdates()
completion()
#endif
}
}
@@ -104,14 +120,23 @@ extension Internals {
return snapshot
}
func sectionIdentifier(inSection section: Int) -> String? {
guard self.sections.indices.contains(section) else {
return nil
}
return self.sections[section].differenceIdentifier
}
func itemIdentifier(for indexPath: IndexPath) -> O.ObjectID? {
guard (0 ..< self.sections.endIndex) ~= indexPath.section else {
guard self.sections.indices.contains(indexPath.section) else {
return nil
}
let items = self.sections[indexPath.section].elements
guard (0 ..< items.endIndex) ~= indexPath.item else {
guard items.indices.contains(indexPath.item) else {
return nil
}
@@ -138,15 +163,14 @@ extension Internals {
return self.sections.count
}
func numberOfItems(inSection section: Int) -> Int {
func numberOfItems(inSection section: Int) -> Int? {
guard self.sections.indices.contains(section) else {
return nil
}
return self.sections[section].elements.count
}
func sectionIdentifier(inSection section: Int) -> String {
return self.sections[section].differenceIdentifier
}
// MARK: Private