Attachment menu improvements

submodules/TelegramUI/Sources/AttachmentFileEmptyItem.swift

@@ -0,0 +1,103 @@
+import Foundation
+import UIKit
+import AsyncDisplayKit
+import Display
+import TelegramPresentationData
+import ItemListUI
+import PresentationDataUtils
+import AnimatedStickerNode
+import TelegramAnimatedStickerNode
+import AccountContext
+
+final class AttachmentFileEmptyStateItem: ItemListControllerEmptyStateItem {
+    let context: AccountContext
+    let theme: PresentationTheme
+    let strings: PresentationStrings
+    
+    init(context: AccountContext, theme: PresentationTheme, strings: PresentationStrings) {
+        self.context = context
+        self.theme = theme
+        self.strings = strings
+    }
+    
+    func isEqual(to: ItemListControllerEmptyStateItem) -> Bool {
+        if let item = to as? AttachmentFileEmptyStateItem {
+            return self.theme === item.theme && self.strings === item.strings
+        } else {
+            return false
+        }
+    }
+    
+    func node(current: ItemListControllerEmptyStateItemNode?) -> ItemListControllerEmptyStateItemNode {
+        if let current = current as? AttachmentFileEmptyStateItemNode {
+            current.item = self
+            return current
+        } else {
+            return AttachmentFileEmptyStateItemNode(item: self)
+        }
+    }
+}
+
+final class AttachmentFileEmptyStateItemNode: ItemListControllerEmptyStateItemNode {
+    private var animationNode: AnimatedStickerNode
+    private let textNode: ASTextNode
+    private var validLayout: (ContainerViewLayout, CGFloat)?
+    
+    var item: AttachmentFileEmptyStateItem {
+        didSet {
+            self.updateThemeAndStrings(theme: self.item.theme, strings: self.item.strings)
+            if let (layout, navigationHeight) = self.validLayout {
+                self.updateLayout(layout: layout, navigationBarHeight: navigationHeight, transition: .immediate)
+            }
+        }
+    }
+    
+    init(item: AttachmentFileEmptyStateItem) {
+        self.item = item
+        
+        self.animationNode = AnimatedStickerNode()
+        self.animationNode.setup(source: AnimatedStickerNodeLocalFileSource(name: "Files"), width: 320, height: 320, playbackMode: .loop, mode: .direct(cachePathPrefix: nil))
+        self.animationNode.visibility = true
+        
+        self.textNode = ASTextNode()
+        self.textNode.isUserInteractionEnabled = false
+        self.textNode.lineSpacing = 0.1
+        self.textNode.textAlignment = .center
+        
+        super.init()
+        
+        self.isUserInteractionEnabled = false
+        
+        self.addSubnode(self.animationNode)
+        self.addSubnode(self.textNode)
+        
+        self.updateThemeAndStrings(theme: self.item.theme, strings: self.item.strings)
+    }
+    
+    private func updateThemeAndStrings(theme: PresentationTheme, strings: PresentationStrings) {
+        self.textNode.attributedText = NSAttributedString(string: strings.Attachment_FilesIntro, font: Font.regular(15.0), textColor: theme.list.freeTextColor, paragraphAlignment: .center)
+    }
+    
+    override func updateLayout(layout: ContainerViewLayout, navigationBarHeight: CGFloat, transition: ContainedViewLayoutTransition) {
+        self.validLayout = (layout, navigationBarHeight)
+        var insets = layout.insets(options: [])
+        insets.top += navigationBarHeight - 92.0
+        
+        let imageSpacing: CGFloat = 12.0
+    
+        let imageSize = CGSize(width: 144.0, height: 144.0)
+        let imageHeight = layout.size.width < layout.size.height ? imageSize.height + imageSpacing : 0.0
+        
+        self.animationNode.frame = CGRect(origin: CGPoint(x: floor((layout.size.width - imageSize.width) / 2.0), y: -10.0), size: imageSize)
+        self.animationNode.updateLayout(size: imageSize)
+        
+        let textSize = self.textNode.measure(CGSize(width: layout.size.width - layout.safeInsets.left - layout.safeInsets.right - 70.0, height: max(1.0, layout.size.height - insets.top - insets.bottom)))
+        
+        let totalHeight = imageHeight + textSize.height
+        let topOffset = insets.top + floor((layout.size.height - insets.top - insets.bottom - totalHeight) / 2.0)
+        
+        transition.updateAlpha(node: self.animationNode, alpha: imageHeight > 0.0 ? 1.0 : 0.0)
+        transition.updateFrame(node: self.animationNode, frame: CGRect(origin: CGPoint(x: floor((layout.size.width - imageSize.width) / 2.0), y: topOffset), size: imageSize))
+        transition.updateFrame(node: self.textNode, frame: CGRect(origin: CGPoint(x: layout.safeInsets.left + floor((layout.size.width - textSize.width - layout.safeInsets.left - layout.safeInsets.right) / 2.0), y: topOffset + imageHeight), size: textSize))
+    }
+}