From a217e4c1aaa3ec4585e684dba0477f928c590827 Mon Sep 17 00:00:00 2001
From: Ilya Laktyushin <ilya@laktyush.in>
Date: Thu, 2 Dec 2021 18:29:19 +0400
Subject: [PATCH] Improve spoiler reveal

---
 .../Sources/InvisibleInkDustNode.swift        |  48 +++++++++++++++++-
 .../TextSpot.imageset/Contents.json           |  21 ++++++++
 .../TextSpot.imageset/blurSmall_Normal@3x.png | Bin 0 -> 6505 bytes
 .../ChatMessageTextBubbleContentNode.swift    |  13 +----
 4 files changed, 68 insertions(+), 14 deletions(-)
 create mode 100644 submodules/TelegramUI/Images.xcassets/Components/TextSpot.imageset/Contents.json
 create mode 100644 submodules/TelegramUI/Images.xcassets/Components/TextSpot.imageset/blurSmall_Normal@3x.png

diff --git a/submodules/InvisibleInkDustNode/Sources/InvisibleInkDustNode.swift b/submodules/InvisibleInkDustNode/Sources/InvisibleInkDustNode.swift
index b42347bd9c..84e8c537d1 100644
--- a/submodules/InvisibleInkDustNode/Sources/InvisibleInkDustNode.swift
+++ b/submodules/InvisibleInkDustNode/Sources/InvisibleInkDustNode.swift
@@ -17,11 +17,28 @@ private func createEmitterBehavior(type: String) -> NSObject {
 public class InvisibleInkDustNode: ASDisplayNode {
     private var currentParams: (size: CGSize, color: UIColor, rects: [CGRect])?
     
+    private weak var textNode: TextNode?
+    
+    private let maskNode: ASDisplayNode
+    private let spotNode: ASImageNode
+    
     private var emitter: CAEmitterCell?
     private var emitterLayer: CAEmitterLayer?
         
     public var isRevealedUpdated: (Bool) -> Void = { _ in }
     
+    public init(textNode: TextNode) {
+        self.textNode = textNode
+        
+        self.maskNode = ASDisplayNode()
+        self.spotNode = ASImageNode()
+        self.spotNode.image = UIImage(bundleImageName: "Components/TextSpot")
+                
+        super.init()
+        
+        self.maskNode.addSubnode(self.spotNode)
+    }
+    
     public override func didLoad() {
         super.didLoad()
         
@@ -77,23 +94,48 @@ public class InvisibleInkDustNode: ASDisplayNode {
     
     private var revealed = false
     @objc private func tap(_ gestureRecognizer: UITapGestureRecognizer) {
-        guard !self.revealed else {
+        guard let (size, _, _) = self.currentParams, !self.revealed else {
             return
         }
+        
         self.revealed = true
         
         let position = gestureRecognizer.location(in: self.view)
         self.emitterLayer?.setValue(true, forKeyPath: "emitterBehaviors.fingerAttractor.enabled")
         self.emitterLayer?.setValue(position, forKeyPath: "emitterBehaviors.fingerAttractor.position")
         
+        self.textNode?.view.mask = self.maskNode.view
+        self.textNode?.alpha = 1.0
+        
+        let radius = max(size.width, size.height)
+        self.spotNode.frame = CGRect(x: position.x - radius / 2.0, y: position.y - radius / 2.0, width: radius, height: radius)
+        
+        self.spotNode.layer.animateAlpha(from: 0.0, to: 1.0, duration: 0.15)
+        self.spotNode.layer.animateScale(from: 0.0, to: 3.5, duration: 0.61, removeOnCompletion: false, completion: { [weak self] _ in
+            self?.textNode?.view.mask = nil
+        })
+                
         Queue.mainQueue().after(0.2) {
+            let transition = ContainedViewLayoutTransition.animated(duration: 0.4, curve: .linear)
+            transition.updateAlpha(node: self, alpha: 0.0)
+                        
             self.isRevealedUpdated(true)
         }
         
+        Queue.mainQueue().after(0.7) {
+            self.emitterLayer?.setValue(false, forKeyPath: "emitterBehaviors.fingerAttractor.enabled")
+            self.spotNode.layer.removeAllAnimations()
+        }
+        
         Queue.mainQueue().after(4.0) {
             self.revealed = false
-            self.emitterLayer?.setValue(false, forKeyPath: "emitterBehaviors.fingerAttractor.enabled")
             self.isRevealedUpdated(false)
+            
+            let transition = ContainedViewLayoutTransition.animated(duration: 0.4, curve: .linear)
+            transition.updateAlpha(node: self, alpha: 1.0)
+            if let textNode = self.textNode {
+                transition.updateAlpha(node: textNode, alpha: 0.0)
+            }
         }
     }
     
@@ -120,6 +162,8 @@ public class InvisibleInkDustNode: ASDisplayNode {
     
     public func update(size: CGSize, color: UIColor, rects: [CGRect]) {
         self.currentParams = (size, color, rects)
+                
+        self.maskNode.frame = CGRect(origin: CGPoint(x: 3.0, y: 3.0), size: size)
         
         if self.isNodeLoaded {
             self.updateEmitter()
diff --git a/submodules/TelegramUI/Images.xcassets/Components/TextSpot.imageset/Contents.json b/submodules/TelegramUI/Images.xcassets/Components/TextSpot.imageset/Contents.json
new file mode 100644
index 0000000000..dce2efef0a
--- /dev/null
+++ b/submodules/TelegramUI/Images.xcassets/Components/TextSpot.imageset/Contents.json
@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "blurSmall_Normal@3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/submodules/TelegramUI/Images.xcassets/Components/TextSpot.imageset/blurSmall_Normal@3x.png b/submodules/TelegramUI/Images.xcassets/Components/TextSpot.imageset/blurSmall_Normal@3x.png
new file mode 100644
index 0000000000000000000000000000000000000000..e9f0dcdbc3f6f4d2505f8cf51e948b85f70fe13f
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diff --git a/submodules/TelegramUI/Sources/ChatMessageTextBubbleContentNode.swift b/submodules/TelegramUI/Sources/ChatMessageTextBubbleContentNode.swift
index 5b8f4661d8..d5bdadc345 100644
--- a/submodules/TelegramUI/Sources/ChatMessageTextBubbleContentNode.swift
+++ b/submodules/TelegramUI/Sources/ChatMessageTextBubbleContentNode.swift
@@ -387,18 +387,7 @@ class ChatMessageTextBubbleContentNode: ChatMessageBubbleContentNode {
                                 if let current = strongSelf.dustNode {
                                     dustNode = current
                                 } else {
-                                    dustNode = InvisibleInkDustNode()
-                                    dustNode.isRevealedUpdated = { [weak self] revealed in
-                                        if let strongSelf = self {
-                                            let transition = ContainedViewLayoutTransition.animated(duration: 0.4, curve: .linear)
-                                            if let dustNode = strongSelf.dustNode {
-                                                transition.updateAlpha(node: dustNode, alpha: revealed ? 0.0 : 1.0)
-                                            }
-                                            if let spoilerTextNode = strongSelf.spoilerTextNode {
-                                                transition.updateAlpha(node: spoilerTextNode, alpha: revealed ? 1.0 : 0.0)
-                                            }
-                                        }
-                                    }
+                                    dustNode = InvisibleInkDustNode(textNode: spoilerTextNode)
                                     strongSelf.dustNode = dustNode
                                     strongSelf.insertSubnode(dustNode, aboveSubnode: spoilerTextNode)
                                 }