no message

TelegramUI/ChatMessageActionItemNode.swift

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+import Foundation
+import AsyncDisplayKit
+import Display
+import SwiftSignalKit
+import Postbox
+import TelegramCore
+
+private func backgroundImage(color: UIColor) -> UIImage? {
+    return generateImage(CGSize(width: 20.0, height: 20.0), contextGenerator: { size, context -> Void in
+        context.clear(CGRect(origin: CGPoint(), size: size))
+        context.setFillColor(UIColor(0x748391, 0.45).cgColor)
+        context.fillEllipse(in: CGRect(origin: CGPoint(), size: size))
+    })?.stretchableImage(withLeftCapWidth: 8, topCapHeight: 8)
+}
+
+private let titleFont = UIFont.systemFont(ofSize: 13.0)
+
+class ChatMessageActionItemNode: ChatMessageItemView {
+    let labelNode: TextNode
+    let backgroundNode: ASImageNode
+    
+    private let fetchDisposable = MetaDisposable()
+    
+    required init() {
+        self.labelNode = TextNode()
+        self.labelNode.isLayerBacked = true
+        self.labelNode.displaysAsynchronously = true
+        
+        self.backgroundNode = ASImageNode()
+        self.backgroundNode.isLayerBacked = true
+        self.backgroundNode.displayWithoutProcessing = true
+        self.backgroundNode.displaysAsynchronously = false
+        
+        super.init(layerBacked: false)
+        
+        self.backgroundNode.image = backgroundImage(color: UIColor.blue)
+        self.addSubnode(self.backgroundNode)
+        self.addSubnode(self.labelNode)
+    }
+    
+    required init?(coder aDecoder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+    deinit {
+        self.fetchDisposable.dispose()
+    }
+    
+    override func setupItem(_ item: ChatMessageItem) {
+        super.setupItem(item)
+    }
+    
+    override func asyncLayout() -> (_ item: ChatMessageItem, _ width: CGFloat, _ mergedTop: Bool, _ mergedBottom: Bool) -> (ListViewItemNodeLayout, (ListViewItemUpdateAnimation) -> Void) {
+        let labelLayout = TextNode.asyncLayout(self.labelNode)
+        
+        return { item, width, mergedTop, mergedBottom in
+            var attributedString: NSAttributedString?
+            
+            for media in item.message.media {
+                if let action = media as? TelegramMediaAction {
+                    let authorName = item.message.author?.displayTitle ?? ""
+                    switch action.action {
+                        case .groupCreated:
+                            attributedString = NSAttributedString(string: tr(.ChatServiceGroupCreated), font: titleFont, textColor: UIColor.white)
+                        case let .addedMembers(peerIds):
+                            if peerIds.first == item.message.author?.id {
+                                attributedString = NSAttributedString(string: tr(.ChatServiceGroupAddedSelf(authorName)), font: titleFont, textColor: UIColor.white)
+                            } else {
+                                attributedString = NSAttributedString(string: tr(.ChatServiceGroupAddedMembers(authorName, peerDisplayTitles(peerIds, item.message.peers))), font: titleFont, textColor: UIColor.white)
+                            }
+                        case let .removedMembers(peerIds):
+                            if peerIds.first == item.message.author?.id {
+                                attributedString = NSAttributedString(string: tr(.ChatServiceGroupRemovedSelf(authorName)), font: titleFont, textColor: UIColor.white)
+                            } else {
+                                attributedString = NSAttributedString(string: tr(.ChatServiceGroupRemovedMembers(authorName, peerDisplayTitles(peerIds, item.message.peers))), font: titleFont, textColor: UIColor.white)
+                            }
+                        case let .photoUpdated(image):
+                            if let _ = image {
+                                attributedString = NSAttributedString(string: tr(.ChatServiceGroupUpdatedPhoto(authorName)), font: titleFont, textColor: UIColor.white)
+                            } else {
+                                attributedString = NSAttributedString(string: tr(.ChatServiceGroupRemovedPhoto(authorName)), font: titleFont, textColor: UIColor.white)
+                            }
+                        case let .titleUpdated(title):
+                            attributedString = NSAttributedString(string: tr(.ChatServiceGroupUpdatedTitle(authorName, title)), font: titleFont, textColor: UIColor.white)
+                        case .pinnedMessageUpdated:
+                            var replyMessageText = ""
+                            for attribute in item.message.attributes {
+                                if let attribute = attribute as? ReplyMessageAttribute, let message = item.message.associatedMessages[attribute.messageId] {
+                                    replyMessageText = message.text
+                                }
+                            }
+                            attributedString = NSAttributedString(string: tr(.ChatServiceGroupUpdatedPinnedMessage(authorName, replyMessageText)), font: titleFont, textColor: UIColor.white)
+                        case .joinedByLink:
+                            attributedString = NSAttributedString(string: tr(.ChatServiceGroupJoinedByLink(authorName)), font: titleFont, textColor: UIColor.white)
+                        case .channelMigratedFromGroup, .groupMigratedToChannel:
+                            attributedString = NSAttributedString(string: tr(.ChatServiceGroupMigratedToSupergroup), font: titleFont, textColor: UIColor.white)
+                        default:
+                            attributedString = nil
+                    }
+                    
+                    break
+                }
+            }
+            
+            let (size, apply) = labelLayout(attributedString, nil, 1, .end, CGSize(width: width, height: CGFloat.greatestFiniteMagnitude), nil)
+            
+            let backgroundSize = CGSize(width: size.size.width + 8.0 + 8.0, height: 20.0)
+            
+            return (ListViewItemNodeLayout(contentSize: CGSize(width: width, height: 20.0), insets: UIEdgeInsets(top: 4.0, left: 0.0, bottom: 4.0, right: 0.0)), { [weak self] animation in
+                if let strongSelf = self {
+                    let _ = apply()
+                    
+                    strongSelf.backgroundNode.frame = CGRect(origin: CGPoint(x: floorToScreenPixels((width - backgroundSize.width) / 2.0), y: 0.0), size: backgroundSize)
+                    strongSelf.labelNode.frame = CGRect(origin: CGPoint(x: strongSelf.backgroundNode.frame.origin.x + 8.0, y: floorToScreenPixels((backgroundSize.height - size.size.height) / 2.0) - 1.0), size: size.size)
+                }
+            })
+        }
+    }
+    
+    override func animateInsertion(_ currentTimestamp: Double, duration: Double) {
+        super.animateInsertion(currentTimestamp, duration: duration)
+        
+        self.backgroundNode.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.2)
+        self.labelNode.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.2)
+    }
+    
+    override func animateAdded(_ currentTimestamp: Double, duration: Double) {
+        super.animateAdded(currentTimestamp, duration: duration)
+        
+        self.backgroundNode.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.2)
+        self.labelNode.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.2)
+    }
+}