mirror of
https://github.com/vector-im/element-ios.git
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122 lines
4.1 KiB
Swift
122 lines
4.1 KiB
Swift
//
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// Copyright 2021 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import UIKit
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class VoiceMessageWaveformView: UIView {
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private let lineWidth: CGFloat = 2.0
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private let linePadding: CGFloat = 2.0
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private let renderingQueue: DispatchQueue = DispatchQueue(label: "io.element.VoiceMessageWaveformView.queue", qos: .userInitiated)
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var samples: [Float] = [] {
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didSet {
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computeWaveForm()
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}
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}
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var primaryLineColor = UIColor.lightGray {
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didSet {
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backgroundLayer.strokeColor = primaryLineColor.cgColor
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backgroundLayer.fillColor = primaryLineColor.cgColor
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}
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}
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var secondaryLineColor = UIColor.darkGray {
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didSet {
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progressLayer.strokeColor = secondaryLineColor.cgColor
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progressLayer.fillColor = secondaryLineColor.cgColor
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}
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}
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private let backgroundLayer = CAShapeLayer()
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private let progressLayer = CAShapeLayer()
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var progress = 0.0 {
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didSet {
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CATransaction.begin()
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CATransaction.setDisableActions(true)
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progressLayer.frame = CGRect(origin: self.bounds.origin, size: CGSize(width: self.bounds.width * CGFloat(self.progress), height: self.bounds.height))
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CATransaction.commit()
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}
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}
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var requiredNumberOfSamples: Int {
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return Int(self.bounds.size.width / (lineWidth + linePadding))
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}
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override init(frame: CGRect) {
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super.init(frame: frame)
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setupAndAdd(backgroundLayer, with: primaryLineColor)
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setupAndAdd(progressLayer, with: secondaryLineColor)
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progressLayer.masksToBounds = true
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computeWaveForm()
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}
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required init?(coder: NSCoder) {
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fatalError()
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}
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override func layoutSubviews() {
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super.layoutSubviews()
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backgroundLayer.frame = self.bounds
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progressLayer.frame = CGRect(origin: self.bounds.origin, size: CGSize(width: self.bounds.width * CGFloat(self.progress), height: self.bounds.height))
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computeWaveForm()
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}
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// MARK: - Private
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private func computeWaveForm() {
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renderingQueue.async { [samples] in // Capture the current samples as a way to provide atomicity
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let path = UIBezierPath()
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let drawMappingFactor = self.bounds.size.height
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let minimumGraphAmplitude: CGFloat = 1
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var xOffset: CGFloat = self.lineWidth / 2
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var index = 0
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while xOffset < self.bounds.width - self.lineWidth {
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let sample = CGFloat(index >= samples.count ? 1 : samples[index])
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let invertedDbSample = 1 - sample // sample is in dB, linearly normalized to [0, 1] (1 -> -50 dB)
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let drawingAmplitude = max(minimumGraphAmplitude, invertedDbSample * drawMappingFactor)
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path.move(to: CGPoint(x: xOffset, y: self.bounds.midY - drawingAmplitude / 2))
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path.addLine(to: CGPoint(x: xOffset, y: self.bounds.midY + drawingAmplitude / 2))
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xOffset += self.lineWidth + self.linePadding
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index += 1
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}
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DispatchQueue.main.async {
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self.backgroundLayer.path = path.cgPath
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self.progressLayer.path = path.cgPath
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}
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}
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}
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private func setupAndAdd(_ shapeLayer: CAShapeLayer, with color: UIColor) {
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shapeLayer.frame = self.bounds
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shapeLayer.strokeColor = color.cgColor
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shapeLayer.fillColor = color.cgColor
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shapeLayer.lineCap = .round
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shapeLayer.lineWidth = lineWidth
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self.layer.addSublayer(shapeLayer)
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}
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}
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