Swiftgram/TelegramUI/ChatMediaInputPeerSpecificItem.swift

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

final class ChatMediaInputPeerSpecificItem: ListViewItem {
    let account: Account
    let inputNodeInteraction: ChatMediaInputNodeInteraction
    let collectionId: ItemCollectionId
    let peer: Peer
    let selectedItem: () -> Void
    let theme: PresentationTheme
    
    var selectable: Bool {
        return true
    }
    
    init(account: Account, inputNodeInteraction: ChatMediaInputNodeInteraction, collectionId: ItemCollectionId, peer: Peer, theme: PresentationTheme, selected: @escaping () -> Void) {
        self.account = account
        self.inputNodeInteraction = inputNodeInteraction
        self.collectionId = collectionId
        self.peer = peer
        self.selectedItem = selected
        self.theme = theme
    }
    
    func nodeConfiguredForParams(async: @escaping (@escaping () -> Void) -> Void, params: ListViewItemLayoutParams, previousItem: ListViewItem?, nextItem: ListViewItem?, completion: @escaping (ListViewItemNode, @escaping () -> (Signal<Void, NoError>?, () -> Void)) -> Void) {
        async {
            let node = ChatMediaInputPeerSpecificItemNode()
            node.contentSize = boundingSize
            node.insets = ChatMediaInputNode.setupPanelIconInsets(item: self, previousItem: previousItem, nextItem: nextItem)
            node.inputNodeInteraction = self.inputNodeInteraction
            Queue.mainQueue().async {
                completion(node, {
                    return (nil, {
                        node.updateItem(account: self.account, peer: self.peer, collectionId: self.collectionId, theme: self.theme)
                        node.updateAppearanceTransition(transition: .immediate)
                    })
                })
            }
        }
    }
    
    public func updateNode(async: @escaping (@escaping () -> Void) -> Void, node: @escaping () -> ListViewItemNode, params: ListViewItemLayoutParams, previousItem: ListViewItem?, nextItem: ListViewItem?, animation: ListViewItemUpdateAnimation, completion: @escaping (ListViewItemNodeLayout, @escaping () -> Void) -> Void) {
        Queue.mainQueue().async {
            completion(ListViewItemNodeLayout(contentSize: node().contentSize, insets: ChatMediaInputNode.setupPanelIconInsets(item: self, previousItem: previousItem, nextItem: nextItem)), {
                (node() as? ChatMediaInputPeerSpecificItemNode)?.updateItem(account: self.account, peer: self.peer, collectionId: self.collectionId, theme: self.theme)
            })
        }
    }
    
    func selected(listView: ListView) {
        self.selectedItem()
    }
}

private let avatarFont: UIFont = UIFont(name: ".SFCompactRounded-Semibold", size: 10.0)!
private let boundingSize = CGSize(width: 41.0, height: 41.0)
private let boundingImageSize = CGSize(width: 28.0, height: 28.0)
private let highlightSize = CGSize(width: 35.0, height: 35.0)
private let verticalOffset: CGFloat = 3.0

final class ChatMediaInputPeerSpecificItemNode: ListViewItemNode {
    private let avatarNode: AvatarNode
    private let highlightNode: ASImageNode
    
    var inputNodeInteraction: ChatMediaInputNodeInteraction?
    var currentCollectionId: ItemCollectionId?
    private var theme: PresentationTheme?
    
    private let stickerFetchedDisposable = MetaDisposable()
    
    init() {        
        self.highlightNode = ASImageNode()
        self.highlightNode.isLayerBacked = true
        self.highlightNode.isHidden = true
        
        self.avatarNode = AvatarNode(font: avatarFont)
        self.avatarNode.isLayerBacked = !smartInvertColorsEnabled()
        self.avatarNode.transform = CATransform3DMakeRotation(CGFloat.pi / 2.0, 0.0, 0.0, 1.0)
        
        let imageSize = CGSize(width: 32.0, height: 32.0)
        self.avatarNode.frame = CGRect(origin: CGPoint(x: floor((boundingSize.width - imageSize.width) / 2.0) + verticalOffset, y: floor((boundingSize.height - imageSize.height) / 2.0)), size: imageSize)
        
        self.highlightNode.frame = CGRect(origin: CGPoint(x: floor((boundingSize.width - highlightSize.width) / 2.0) + verticalOffset, y: floor((boundingSize.height - highlightSize.height) / 2.0)), size: highlightSize)
        
        super.init(layerBacked: false, dynamicBounce: false)
        
        self.addSubnode(self.highlightNode)
        self.addSubnode(self.avatarNode)
    }
    
    deinit {
        self.stickerFetchedDisposable.dispose()
    }
    
    func updateItem(account: Account, peer: Peer, collectionId: ItemCollectionId, theme: PresentationTheme) {
        self.currentCollectionId = collectionId
        
        if self.theme !== theme {
            self.theme = theme
            
            self.highlightNode.image = PresentationResourcesChat.chatMediaInputPanelHighlightedIconImage(theme)
        }
        
        self.avatarNode.setPeer(account: account, peer: peer)
    }
    
    func updateIsHighlighted() {
        assert(Queue.mainQueue().isCurrent())
        if let currentCollectionId = self.currentCollectionId, let inputNodeInteraction = self.inputNodeInteraction {
            self.highlightNode.isHidden = inputNodeInteraction.highlightedItemCollectionId != currentCollectionId
        }
    }
    
    func updateAppearanceTransition(transition: ContainedViewLayoutTransition) {
        assert(Queue.mainQueue().isCurrent())
        if let inputNodeInteraction = self.inputNodeInteraction {
            transition.updateSublayerTransformScale(node: self, scale: inputNodeInteraction.appearanceTransition)
        }
    }
    
    override func animateAdded(_ currentTimestamp: Double, duration: Double) {
        self.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.2)
    }
    
    override func animateRemoved(_ currentTimestamp: Double, duration: Double) {
        self.layer.animateAlpha(from: 1.0, to: 0.0, duration: 0.15, removeOnCompletion: false)
    }
}