Signal-iOS/SignalUI/Views/OWSLayerView.swift

//
// Copyright 2018 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
//

import Foundation

@objc
open class OWSLayerView: UIView {
    @objc
    public var shouldAnimate = true

    @objc
    public var layoutCallback: (UIView) -> Void

    @objc
    public init() {
        self.layoutCallback = { (_) in
        }
        super.init(frame: .zero)
    }

    @objc
    public init(frame: CGRect, layoutCallback: @escaping (UIView) -> Void) {
        self.layoutCallback = layoutCallback
        super.init(frame: frame)
    }

    public required init?(coder aDecoder: NSCoder) {
        self.layoutCallback = { _ in
        }
        super.init(coder: aDecoder)
    }

    @objc
    public static func circleView() -> OWSLayerView {
        circleView(size: nil)
    }

    public static func circleView(size: CGFloat? = nil) -> OWSLayerView {
        let result = OWSLayerView(frame: .zero) { view in
            view.layer.cornerRadius = min(view.width, view.height) * 0.5
        }
        if let size = size {
            result.autoSetDimensions(to: CGSize.square(size))
        }
        return result
    }

    @objc
    public static func pillView() -> OWSLayerView {
        pillView(height: nil)
    }

    public static func pillView(height: CGFloat? = nil) -> OWSLayerView {
        let result = OWSLayerView(frame: .zero) { view in
            view.layer.cornerRadius = min(view.width, view.height) * 0.5
        }
        if let height = height {
            result.autoSetDimension(.height, toSize: height)
        }
        return result
    }

    public override var bounds: CGRect {
        didSet {
            if oldValue != bounds {
                layoutSubviews()
            }
        }
    }

    public override var frame: CGRect {
        didSet {
            if oldValue != frame {
                layoutSubviews()
            }
        }
    }

    public override var center: CGPoint {
        didSet {
            if oldValue != center {
                layoutSubviews()
            }
        }
    }

    public override func layoutSubviews() {
        super.layoutSubviews()

        layoutCallback(self)
    }

    public func updateContent() {
        if shouldAnimate {
            layoutSubviews()
        } else {
            CATransaction.begin()
            CATransaction.setDisableActions(true)
            layoutSubviews()
            CATransaction.commit()
        }
    }

    // MARK: - Tap

    public typealias TapBlock = () -> Void
    private var tapBlock: TapBlock?

    public func addTapGesture(_ tapBlock: @escaping TapBlock) {
        self.tapBlock = tapBlock
        isUserInteractionEnabled = true
        addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(didTap)))
    }

    @objc
    private func didTap() {
        guard let tapBlock = tapBlock else {
            owsFailDebug("Missing tapBlock.")
            return
        }
        tapBlock()
    }

    // MARK: - Long Press

    public typealias LongPressBlock = () -> Void
    private var longPressBlock: LongPressBlock?

    public func addLongPressGesture(_ longPressBlock: @escaping LongPressBlock) {
        self.longPressBlock = longPressBlock
        isUserInteractionEnabled = true
        addGestureRecognizer(UILongPressGestureRecognizer(target: self, action: #selector(didLongPress)))
    }

    @objc
    private func didLongPress() {
        guard let longPressBlock = longPressBlock else {
            owsFailDebug("Missing longPressBlock.")
            return
        }
        longPressBlock()
    }

    // MARK: - 

    public func reset() {
        removeAllSubviews()

        self.layoutCallback = { _ in }

        self.tapBlock = nil
        self.longPressBlock = nil

        if let gestureRecognizers = self.gestureRecognizers {
            for gestureRecognizer in gestureRecognizers {
                removeGestureRecognizer(gestureRecognizer)
            }
        }
    }
}