Swiftgram/TelegramUI/ThemeColorsGridController.swift

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

final class ThemeColorsGridController: ViewController {
    private var controllerNode: ThemeColorsGridControllerNode {
        return self.displayNode as! ThemeColorsGridControllerNode
    }
    
    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?
    
    private var validLayout: ContainerViewLayout?
    
    init(account: Account) {
        self.account = account
        self.presentationData = account.telegramApplicationContext.currentPresentationData.with { $0 }
        
        super.init(navigationBarPresentationData: NavigationBarPresentationData(presentationData: self.presentationData))
        
        self.title = self.presentationData.strings.WallpaperColors_Title
        self.statusBar.statusBarStyle = self.presentationData.theme.rootController.statusBar.style.style
        
        self.scrollToTop = { [weak self] in
            if let strongSelf = self {
                strongSelf.controllerNode.scrollToTop()
            }
        }
        
        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.WallpaperColors_Title
        self.statusBar.statusBarStyle = self.presentationData.theme.rootController.statusBar.style.style
        self.navigationBar?.updatePresentationData(NavigationBarPresentationData(presentationData: self.presentationData))
        
        if self.isNodeLoaded {
            self.controllerNode.updatePresentationData(self.presentationData)
        }
    }
    
    override func loadDisplayNode() {
        self.displayNode = ThemeColorsGridControllerNode(account: self.account, presentationData: self.presentationData, present: { [weak self] controller, arguments in
            self?.present(controller, in: .window(.root), with: arguments, blockInteraction: true)
        })
    
        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)
    }
}