Swiftgram/TelegramUI/ChatListSearchRecentPeersNode.swift

import Foundation
import AsyncDisplayKit
import Display
import SwiftSignalKit
import Postbox
import TelegramCore

final class ChatListSearchRecentPeersNode: ASDisplayNode {
    private let sectionHeaderNode: ListSectionHeaderNode
    private let listView: ListView
    
    private let disposable = MetaDisposable()
    
    init(account: Account, peerSelected: @escaping (PeerId) -> Void) {
        self.sectionHeaderNode = ListSectionHeaderNode()
        self.sectionHeaderNode.title = "PEOPLE"
        
        self.listView = ListView()
        self.listView.transform = CATransform3DMakeRotation(-CGFloat(M_PI / 2.0), 0.0, 0.0, 1.0)
        
        super.init()
        
        self.addSubnode(self.sectionHeaderNode)
        self.addSubnode(self.listView)
        
        self.disposable.set((recentPeers(account: account) |> take(1) |> deliverOnMainQueue).start(next: { [weak self] peers in
            if let strongSelf = self {
                var items: [ListViewItem] = []
                for peer in peers {
                    items.append(HorizontalPeerItem(account: account, peer: peer, action: peerSelected))
                }
                strongSelf.listView.deleteAndInsertItems(deleteIndices: [], insertIndicesAndItems: (0 ..< items.count).map({ ListViewInsertItem(index: $0, previousIndex: nil, item: items[$0], directionHint: .Down) }), updateIndicesAndItems: [], options: [])
            }
        }))
    }
    
    deinit {
        disposable.dispose()
    }
    
    override func calculateSizeThatFits(_ constrainedSize: CGSize) -> CGSize {
        return CGSize(width: constrainedSize.width, height: 120.0)
    }
    
    override func layout() {
        super.layout()
        
        let bounds = self.bounds
        
        self.sectionHeaderNode.frame = CGRect(origin: CGPoint(), size: CGSize(width: self.bounds.size.width, height: 29.0))
        self.sectionHeaderNode.layout()
        
        self.listView.bounds = CGRect(x: 0.0, y: 0.0, width: 92.0, height: bounds.size.width)
        self.listView.position = CGPoint(x: bounds.size.width / 2.0, y: 92.0 / 2.0 + 29.0)
        self.listView.deleteAndInsertItems(deleteIndices: [], insertIndicesAndItems: [], updateIndicesAndItems: [], options: [.Synchronous], scrollToItem: nil, updateSizeAndInsets: ListViewUpdateSizeAndInsets(size: CGSize(width: 92.0, height: bounds.size.width), insets: UIEdgeInsets(), duration: 0.0, curve: .Default), stationaryItemRange: nil, completion: { _ in })
    }
}