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TelegramUI/HashtagChatInputPanelItem.swift

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+import Foundation
+import AsyncDisplayKit
+import Display
+import TelegramCore
+import SwiftSignalKit
+import Postbox
+
+final class HashtagChatInputPanelItem: ListViewItem {
+    fileprivate let text: String
+    private let hashtagSelected: (String) -> Void
+    
+    let selectable: Bool = true
+    
+    public init(text: String, hashtagSelected: @escaping (String) -> Void) {
+        self.text = text
+        self.hashtagSelected = hashtagSelected
+    }
+    
+    public func nodeConfiguredForWidth(async: @escaping (@escaping () -> Void) -> Void, width: CGFloat, previousItem: ListViewItem?, nextItem: ListViewItem?, completion: @escaping (ListViewItemNode, @escaping () -> Void) -> Void) {
+        let configure = { () -> Void in
+            let node = HashtagChatInputPanelItemNode()
+            
+            let nodeLayout = node.asyncLayout()
+            let (top, bottom) = (previousItem != nil, nextItem != nil)
+            let (layout, apply) = nodeLayout(self, width, top, bottom)
+            
+            node.contentSize = layout.contentSize
+            node.insets = layout.insets
+            
+            completion(node, {
+                apply(.None)
+            })
+        }
+        if Thread.isMainThread {
+            async {
+                configure()
+            }
+        } else {
+            configure()
+        }
+    }
+    
+    public func updateNode(async: @escaping (@escaping () -> Void) -> Void, node: ListViewItemNode, width: CGFloat, previousItem: ListViewItem?, nextItem: ListViewItem?, animation: ListViewItemUpdateAnimation, completion: @escaping (ListViewItemNodeLayout, @escaping () -> Void) -> Void) {
+        if let node = node as? HashtagChatInputPanelItemNode {
+            Queue.mainQueue().async {
+                let nodeLayout = node.asyncLayout()
+                
+                async {
+                    let (top, bottom) = (previousItem != nil, nextItem != nil)
+                    
+                    let (layout, apply) = nodeLayout(self, width, top, bottom)
+                    Queue.mainQueue().async {
+                        completion(layout, {
+                            apply(animation)
+                        })
+                    }
+                }
+            }
+        } else {
+            assertionFailure()
+        }
+    }
+    
+    func selected(listView: ListView) {
+        self.hashtagSelected(self.text)
+    }
+}
+
+private let textFont = Font.medium(14.0)
+
+final class HashtagChatInputPanelItemNode: ListViewItemNode {
+    static let itemHeight: CGFloat = 42.0
+    private let textNode: TextNode
+    private let topSeparatorNode: ASDisplayNode
+    private let separatorNode: ASDisplayNode
+    private let highlightedBackgroundNode: ASDisplayNode
+    
+    init() {
+        self.textNode = TextNode()
+        
+        self.topSeparatorNode = ASDisplayNode()
+        self.topSeparatorNode.backgroundColor = UIColor(0xC9CDD1)
+        self.topSeparatorNode.isLayerBacked = true
+        
+        self.separatorNode = ASDisplayNode()
+        self.separatorNode.backgroundColor = UIColor(0xD6D6DA)
+        self.separatorNode.isLayerBacked = true
+        
+        self.highlightedBackgroundNode = ASDisplayNode()
+        self.highlightedBackgroundNode.backgroundColor = UIColor(0xd9d9d9)
+        self.highlightedBackgroundNode.isLayerBacked = true
+        
+        super.init(layerBacked: false, dynamicBounce: false)
+        
+        self.backgroundColor = .white
+        self.addSubnode(self.topSeparatorNode)
+        self.addSubnode(self.separatorNode)
+        self.addSubnode(self.textNode)
+    }
+    
+    override public func layoutForWidth(_ width: CGFloat, item: ListViewItem, previousItem: ListViewItem?, nextItem: ListViewItem?) {
+        if let item = item as? HashtagChatInputPanelItem {
+            let doLayout = self.asyncLayout()
+            let merged = (top: previousItem != nil, bottom: nextItem != nil)
+            let (layout, apply) = doLayout(item, width, merged.top, merged.bottom)
+            self.contentSize = layout.contentSize
+            self.insets = layout.insets
+            apply(.None)
+        }
+    }
+    
+    func asyncLayout() -> (_ item: HashtagChatInputPanelItem, _ width: CGFloat, _ mergedTop: Bool, _ mergedBottom: Bool) -> (ListViewItemNodeLayout, (ListViewItemUpdateAnimation) -> Void) {
+        let makeTextLayout = TextNode.asyncLayout(self.textNode)
+        return { [weak self] item, width, mergedTop, mergedBottom in
+            let leftInset: CGFloat = 15.0
+            let rightInset: CGFloat = 10.0
+            
+            let (textLayout, textApply) = makeTextLayout(NSAttributedString(string: item.text, font: textFont, textColor: .black), nil, 1, .end, CGSize(width: width - leftInset - rightInset, height: 100.0), nil)
+            
+            let nodeLayout = ListViewItemNodeLayout(contentSize: CGSize(width: width, height: HashtagChatInputPanelItemNode.itemHeight), insets: UIEdgeInsets())
+            
+            return (nodeLayout, { _ in
+                if let strongSelf = self {
+                    textApply()
+                    strongSelf.textNode.frame = CGRect(origin: CGPoint(x: leftInset, y: floor((nodeLayout.contentSize.height - textLayout.size.height) / 2.0)), size: textLayout.size)
+                    
+                    strongSelf.topSeparatorNode.isHidden = mergedTop
+                    strongSelf.separatorNode.isHidden = !mergedBottom
+                    
+                    strongSelf.topSeparatorNode.frame = CGRect(origin: CGPoint(x: 0.0, y: 0.0), size: CGSize(width: width, height: UIScreenPixel))
+                    strongSelf.separatorNode.frame = CGRect(origin: CGPoint(x: leftInset, y: nodeLayout.contentSize.height - UIScreenPixel), size: CGSize(width: width - leftInset, height: UIScreenPixel))
+                    
+                    strongSelf.highlightedBackgroundNode.frame = CGRect(origin: CGPoint(x: 0.0, y: 0.0), size: CGSize(width: width, height: nodeLayout.size.height + UIScreenPixel))
+                }
+            })
+        }
+    }
+    
+    override func setHighlighted(_ highlighted: Bool, animated: Bool) {
+        super.setHighlighted(highlighted, animated: animated)
+        
+        if highlighted {
+            self.highlightedBackgroundNode.alpha = 1.0
+            if self.highlightedBackgroundNode.supernode == nil {
+                self.insertSubnode(self.highlightedBackgroundNode, aboveSubnode: self.separatorNode)
+            }
+        } else {
+            if self.highlightedBackgroundNode.supernode != nil {
+                if animated {
+                    self.highlightedBackgroundNode.layer.animateAlpha(from: self.highlightedBackgroundNode.alpha, to: 0.0, duration: 0.4, completion: { [weak self] completed in
+                        if let strongSelf = self {
+                            if completed {
+                                strongSelf.highlightedBackgroundNode.removeFromSupernode()
+                            }
+                        }
+                    })
+                    self.highlightedBackgroundNode.alpha = 0.0
+                } else {
+                    self.highlightedBackgroundNode.removeFromSupernode()
+                }
+            }
+        }
+    }
+}