Swiftgram/submodules/WalletUI/Sources/WalletQrScanScreen.swift

import Foundation
import UIKit
import AppBundle
import AccountContext
import TelegramPresentationData
import AsyncDisplayKit
import Display
import Postbox
import TelegramCore
import AlertUI

public final class WalletQrScanScreen: ViewController {
    private let context: AccountContext
    private let tonContext: TonContext
    private var presentationData: PresentationData
    
    public init(context: AccountContext, tonContext: TonContext) {
        self.context = context
        self.tonContext = tonContext
        
        self.presentationData = context.sharedContext.currentPresentationData.with { $0 }
        
        let defaultNavigationPresentationData = NavigationBarPresentationData(presentationTheme: self.presentationData.theme, presentationStrings: self.presentationData.strings)
        let navigationBarTheme = NavigationBarTheme(buttonColor: defaultNavigationPresentationData.theme.buttonColor, disabledButtonColor: defaultNavigationPresentationData.theme.disabledButtonColor, primaryTextColor: defaultNavigationPresentationData.theme.primaryTextColor, backgroundColor: .clear, separatorColor: .clear, badgeBackgroundColor: defaultNavigationPresentationData.theme.badgeBackgroundColor, badgeStrokeColor: defaultNavigationPresentationData.theme.badgeStrokeColor, badgeTextColor: defaultNavigationPresentationData.theme.badgeTextColor)
        
        super.init(navigationBarPresentationData: NavigationBarPresentationData(theme: navigationBarTheme, strings: defaultNavigationPresentationData.strings))
        
        self.navigationPresentation = .modalInLargeLayout
        self.supportedOrientations = ViewControllerSupportedOrientations(regularSize: .all, compactSize: .portrait)
        self.navigationBar?.intrinsicCanTransitionInline = false
        
        self.navigationItem.backBarButtonItem = UIBarButtonItem(title: self.presentationData.strings.Common_Back, style: .plain, target: nil, action: nil)
    }
    
    required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    @objc private func backPressed() {
        self.dismiss()
    }
    
    override public func loadDisplayNode() {
        self.displayNode = WalletQrScanScreenNode(presentationData: self.presentationData)
        
        self.displayNodeDidLoad()
    }
    
    override public func containerLayoutUpdated(_ layout: ContainerViewLayout, transition: ContainedViewLayoutTransition) {
        super.containerLayoutUpdated(layout, transition: transition)
        
        (self.displayNode as! WalletQrScanScreenNode).containerLayoutUpdated(layout: layout, navigationHeight: self.navigationHeight, transition: transition)
    }
}

private final class WalletQrScanScreenNode: ViewControllerTracingNode, UIScrollViewDelegate {
    private var presentationData: PresentationData
    
    private let titleNode: ImmediateTextNode
    private let textNode: ImmediateTextNode
    
    private var navigationHeight: CGFloat?
    
    init(presentationData: PresentationData) {
        self.presentationData = presentationData
        
    
        let title: String = ""
        let text: String = ""
        
        self.titleNode = ImmediateTextNode()
        self.titleNode.displaysAsynchronously = false
        self.titleNode.attributedText = NSAttributedString(string: title, font: Font.bold(32.0), textColor: self.presentationData.theme.list.itemPrimaryTextColor)
        self.titleNode.maximumNumberOfLines = 0
        self.titleNode.textAlignment = .center
        
        self.textNode = ImmediateTextNode()
        self.textNode.displaysAsynchronously = false
        self.textNode.attributedText = NSAttributedString(string: text, font: Font.regular(16.0), textColor: self.presentationData.theme.list.itemPrimaryTextColor)
        self.textNode.maximumNumberOfLines = 0
        self.textNode.lineSpacing = 0.1
        self.textNode.textAlignment = .center
        
        super.init()
        
        self.backgroundColor = self.presentationData.theme.list.plainBackgroundColor
        
        self.addSubnode(self.titleNode)
        self.addSubnode(self.textNode)
    }
    
    func containerLayoutUpdated(layout: ContainerViewLayout, navigationHeight: CGFloat, transition: ContainedViewLayoutTransition) {
        self.navigationHeight = navigationHeight
        
        let sideInset: CGFloat = 32.0
        let titleSpacing: CGFloat = 19.0
        let textSpacing: CGFloat = 37.0
        
        let titleSize = self.titleNode.updateLayout(CGSize(width: layout.size.width - sideInset * 2.0, height: layout.size.height))
        let textSize = self.textNode.updateLayout(CGSize(width: layout.size.width - sideInset * 2.0, height: layout.size.height))
        
        var contentHeight: CGFloat = 0.0
        
        let contentVerticalOrigin = navigationHeight + 10.0
        
        let titleFrame = CGRect(origin: CGPoint(x: floor((layout.size.width - titleSize.width) / 2.0), y: contentVerticalOrigin), size: titleSize)
        transition.updateFrameAdditive(node: self.titleNode, frame: titleFrame)
        let textFrame = CGRect(origin: CGPoint(x: floor((layout.size.width - textSize.width) / 2.0), y: titleFrame.maxY + titleSpacing), size: textSize)
        transition.updateFrameAdditive(node: self.textNode, frame: textFrame)
        
        contentHeight = textFrame.maxY + textSpacing
    }
}