Shared media improvements

submodules/GridMessageSelectionNode/Sources/GridMessageSelectionNode.swift

@@ -59,3 +59,59 @@ public final class GridMessageSelectionNode: ASDisplayNode {
         self.checkNode.frame = CGRect(origin: CGPoint(x: self.bounds.size.width - checkSize.width - 2.0, y: 2.0), size: checkSize)
     }
 }
+
+private final class NullActionClass: NSObject, CAAction {
+    @objc func run(forKey event: String, object anObject: Any, arguments dict: [AnyHashable : Any]?) {
+    }
+}
+
+private let nullAction = NullActionClass()
+
+public final class GridMessageSelectionLayer: CALayer {
+    private var selected = false
+    private let checkLayer: CheckLayer
+
+    public init(theme: CheckNodeTheme) {
+        self.checkLayer = CheckLayer(theme: theme, content: .check)
+
+        super.init()
+
+        self.addSublayer(self.checkLayer)
+    }
+
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    override public func action(forKey event: String) -> CAAction? {
+        return nullAction
+    }
+
+    public func animateIn() {
+        self.checkLayer.animateAlpha(from: 0.0, to: 1.0, duration: 0.5, timingFunction: kCAMediaTimingFunctionSpring)
+        self.checkLayer.animateScale(from: 0.2, to: 1.0, duration: 0.5, timingFunction: kCAMediaTimingFunctionSpring)
+    }
+
+    public func animateOut(completion: @escaping () -> Void) {
+        self.checkLayer.animateAlpha(from: 1.0, to: 0.0, duration: 0.3, timingFunction: kCAMediaTimingFunctionSpring, removeOnCompletion: false)
+        self.checkLayer.animateScale(from: 1.0, to: 0.2, duration: 0.3, timingFunction: kCAMediaTimingFunctionSpring, removeOnCompletion: false, completion: { _ in
+            completion()
+        })
+    }
+
+    public func updateSelected(_ selected: Bool, animated: Bool) {
+        if self.selected != selected {
+            self.selected = selected
+            self.checkLayer.setSelected(selected, animated: animated)
+        }
+    }
+
+    public func updateLayout(size: CGSize) {
+        let checkSize = CGSize(width: 28.0, height: 28.0)
+        let previousSize = self.checkLayer.bounds.size
+        self.checkLayer.frame = CGRect(origin: CGPoint(x: self.bounds.size.width - checkSize.width - 2.0, y: 2.0), size: checkSize)
+        if self.checkLayer.bounds.size != previousSize {
+            self.checkLayer.setNeedsDisplay()
+        }
+    }
+}