Swiftgram/TelegramUI/ThemeGridController.swift

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

final class ThemeGridController: TelegramController {
    private var controllerNode: ThemeGridControllerNode {
        return self.displayNode as! ThemeGridControllerNode
    }
    
    private let _ready = Promise<Bool>()
    override var ready: Promise<Bool> {
        return self._ready
    }
    
    private let account: Account
    
    private var presentationData: PresentationData
    private var presentationDataDisposable: Disposable?
    
    override init(account: Account) {
        self.account = account
        self.presentationData = account.telegramApplicationContext.currentPresentationData.with { $0 }
        
        super.init(account: account)
        
        self.title = self.presentationData.strings.Wallpaper_Title
        self.statusBar.statusBarStyle = self.presentationData.theme.rootController.statusBar.style.style
        
        self.presentationDataDisposable = (account.telegramApplicationContext.presentationData
            |> deliverOnMainQueue).start(next: { [weak self] presentationData in
                if let strongSelf = self {
                    let previousTheme = strongSelf.presentationData.theme
                    let previousStrings = strongSelf.presentationData.strings
                    
                    strongSelf.presentationData = presentationData
                    
                    if previousTheme !== presentationData.theme || previousStrings !== presentationData.strings {
                        strongSelf.updateThemeAndStrings()
                    }
                }
            })
    }
    
    required public init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    deinit {
        self.presentationDataDisposable?.dispose()
    }
    
    private func updateThemeAndStrings() {
        self.title = self.presentationData.strings.Wallpaper_Title
        
        self.statusBar.statusBarStyle = self.presentationData.theme.rootController.statusBar.style.style
        self.navigationBar?.updateTheme(NavigationBarTheme(rootControllerTheme: self.presentationData.theme))
        
        if self.isNodeLoaded {
            self.controllerNode.updatePresentationData(self.presentationData)
        }
    }
    
    override func loadDisplayNode() {
        self.displayNode = ThemeGridControllerNode(account: self.account, presentationData: self.presentationData, present: { [weak self] controller, arguments in
            self?.present(controller, in: .window(.root), with: arguments)
        })
        self._ready.set(self.controllerNode.ready.get())
        
        self.displayNodeDidLoad()
    }
    
    override func containerLayoutUpdated(_ layout: ContainerViewLayout, transition: ContainedViewLayoutTransition) {
        super.containerLayoutUpdated(layout, transition: transition)
        
        self.controllerNode.containerLayoutUpdated(layout, navigationBarHeight: self.navigationHeight, transition: transition)
    }
}