Various improvements

submodules/AnimatedStickerNode/Sources/AnimatedStickerNode.swift

@@ -42,9 +42,15 @@ public enum AnimatedStickerMode {
     case direct
 }
 
+public enum AnimatedStickerPlaybackPosition {
+    case start
+    case end
+}
+
 public enum AnimatedStickerPlaybackMode {
     case once
     case loop
+    case still(AnimatedStickerPlaybackPosition)
 }
 
 private final class AnimatedStickerFrame {
@@ -72,6 +78,7 @@ private protocol AnimatedStickerFrameSource: class {
     var frameCount: Int { get }
     
     func takeFrame() -> AnimatedStickerFrame?
+    func skipToEnd()
 }
 
 private final class AnimatedStickerFrameSourceWrapper {
@@ -244,6 +251,9 @@ private final class AnimatedStickerCachedFrameSource: AnimatedStickerFrameSource
         self.data = data
         self.dataComplete = complete
     }
+    
+    func skipToEnd() {
+    }
 }
 
 private final class AnimatedStickerDirectFrameSource: AnimatedStickerFrameSource {
@@ -289,6 +299,10 @@ private final class AnimatedStickerDirectFrameSource: AnimatedStickerFrameSource
         }
         return AnimatedStickerFrame(data: frameData, type: .argb, width: self.width, height: self.height, bytesPerRow: self.bytesPerRow, index: frameIndex, isLastFrame: frameIndex == self.frameCount - 1)
     }
+    
+    func skipToEnd() {
+        self.currentFrame = self.frameCount - 1
+    }
 }
 
 private final class AnimatedStickerFrameQueue {
@@ -383,7 +397,7 @@ public final class AnimatedStickerNode: ASDisplayNode {
     
     private var renderer: (AnimationRenderer & ASDisplayNode)?
     
-    private var isPlaying: Bool = false
+    public var isPlaying: Bool = false
     private var canDisplayFirstFrame: Bool = false
     private var playbackMode: AnimatedStickerPlaybackMode = .loop
     
@@ -456,7 +470,9 @@ public final class AnimatedStickerNode: ASDisplayNode {
                 if let directData = try? Data(contentsOf: URL(fileURLWithPath: path), options: [.mappedRead]) {
                     strongSelf.directData = (directData, path, width, height)
                 }
-                if strongSelf.isPlaying {
+                if case let .still(position) = playbackMode {
+                    strongSelf.seekTo(position)
+                } else if strongSelf.isPlaying {
                     strongSelf.play()
                 } else if strongSelf.canDisplayFirstFrame {
                     strongSelf.play(firstFrame: true)
@@ -597,11 +613,11 @@ public final class AnimatedStickerNode: ASDisplayNode {
         self.reportedStarted = false
         self.timer.swap(nil)?.invalidate()
         if self.playToCompletionOnStop {
-            self.seekToStart()
+            self.seekTo(.start)
         }
     }
     
-    public func seekToStart() {
+    public func seekTo(_ position: AnimatedStickerPlaybackPosition) {
         self.isPlaying = false
         
         let directData = self.directData
@@ -612,6 +628,9 @@ public final class AnimatedStickerNode: ASDisplayNode {
             var maybeFrameSource: AnimatedStickerFrameSource?
             if let directData = directData {
                 maybeFrameSource = AnimatedStickerDirectFrameSource(queue: queue, data: directData.0, width: directData.2, height: directData.3)
+                if position == .end {
+                    maybeFrameSource?.skipToEnd()
+                }
             } else if let (cachedData, cachedDataComplete) = cachedData {
                 if #available(iOS 9.0, *) {
                     maybeFrameSource = AnimatedStickerCachedFrameSource(queue: queue, data: cachedData, complete: cachedDataComplete, notifyUpdated: {})