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Merge pull request #8 from qwertyyb/develop
feat: add lazy load for list
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| // | ||
| // ScrollView.swift | ||
| // YPaste | ||
| // | ||
| // Created by marchyang on 2019/10/21. | ||
| // Copyright © 2019 qwertyyb. All rights reserved. | ||
| // | ||
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| import Cocoa | ||
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| class ScrollView: NSScrollView { | ||
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| override func draw(_ dirtyRect: NSRect) { | ||
| super.draw(dirtyRect) | ||
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| // Drawing code here. | ||
| } | ||
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| override func scrollWheel(with event: NSEvent) { | ||
| super.scrollWheel(with: event) | ||
| guard let documentView = self.documentView, let scroller = self.verticalScroller, | ||
| event.scrollingDeltaY < 0 | ||
| else { return } | ||
| let scrollDistance = CGFloat(scroller.doubleValue) * documentView.frame.height | ||
| if (documentView.frame.height - scrollDistance < 100) { | ||
| let notification = Notification(name: Notification.Name(rawValue: "scrollerview-ToReachBottom"), object: nil) | ||
| NotificationCenter.default.post(notification) | ||
| } | ||
| } | ||
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| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| // | ||
| // PasteItemsController.swift | ||
| // YPaste | ||
| // | ||
| // Created by marchyang on 2019/10/21. | ||
| // Copyright © 2019 qwertyyb. All rights reserved. | ||
| // | ||
|
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| import Cocoa | ||
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| class PasteItemsController: NSArrayController { | ||
| override init(content: Any?) { | ||
| super.init(content: content) | ||
| } | ||
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| required init?(coder: NSCoder) { | ||
| super.init(coder: coder) | ||
| NotificationCenter.default.addObserver(self, selector: #selector(fetchNextPage), name: Notification.Name(rawValue: "scrollerview-ToReachBottom"), object: nil) | ||
| self.addObserver(self, forKeyPath: "fetchPredicate", options: [.new], context: nil) | ||
| } | ||
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| var page = 1 | ||
| var total: Int { | ||
| get { | ||
| return try! (managedObjectContext?.count(for: defaultFetchRequest()))! | ||
| } | ||
| } | ||
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| override func fetch(with fetchRequest: NSFetchRequest<NSFetchRequestResult>?, merge: Bool) throws { | ||
| fetchRequest?.fetchOffset = 0 | ||
| fetchRequest?.fetchLimit = page * 30 | ||
| try! super.fetch(with: fetchRequest, merge: merge) | ||
| } | ||
| func resetPage () { | ||
| page = 1 | ||
| self.fetch(nil) | ||
| } | ||
| @objc func fetchNextPage() { | ||
| if (arrangedObjects as! [PasteItem]).count >= self.total { | ||
| return | ||
| } | ||
| page += 1 | ||
| self.fetch(nil) | ||
| } | ||
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| override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) { | ||
| if (keyPath == "fetchPredicate") { | ||
| self.resetPage() | ||
| NotificationCenter.default.post(name: NSNotification.Name(rawValue: "fetchPredicateChanged"), object: nil) | ||
| } | ||
| } | ||
| } |
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