Add scrubbing

Riot/Modules/Room/VoiceMessages/VoiceMessagePlaybackView.swift

@@ -16,9 +16,13 @@
 
 import Foundation
 import Reusable
+import UIKit
+import MatrixSDK
 
 protocol VoiceMessagePlaybackViewDelegate: AnyObject {
     func voiceMessagePlaybackViewDidRequestPlaybackToggle()
+    func voiceMessagePlaybackViewRequestedFormattedTimestamp(for progress: CGFloat) -> String?
+    func voiceMessagePlaybackViewDidRequestSeek(to progress: CGFloat)
     func voiceMessagePlaybackViewDidChangeWidth()
 }
 
@@ -40,12 +44,19 @@ class VoiceMessagePlaybackView: UIView, NibLoadable, Themable {
     
     private var _waveformView: VoiceMessageWaveformView!
     private var currentTheme: Theme?
+    private var scrubProgress: CGFloat? {
+        didSet {
+            MXLog.debug("change progress \(scrubProgress)")
+        }
+    }
+    
     
     @IBOutlet private var backgroundView: UIView!
     @IBOutlet private var recordingIcon: UIView!
     @IBOutlet private var playButton: UIButton!
     @IBOutlet private var elapsedTimeLabel: UILabel!
     @IBOutlet private var waveformContainerView: UIView!
+    @IBOutlet private var panGestureRecognizer: UIPanGestureRecognizer!
     
     weak var delegate: VoiceMessagePlaybackViewDelegate?
     
@@ -94,19 +105,17 @@ class VoiceMessagePlaybackView: UIView, NibLoadable, Themable {
         }
         
         if details.loading {
-            elapsedTimeLabel.text = "--:--"
             _waveformView.progress = 0
             _waveformView.samples = []
             _waveformView.alpha = 0.3
         } else {
-            elapsedTimeLabel.text = details.currentTime
             _waveformView.progress = details.progress
             _waveformView.samples = details.samples
             _waveformView.alpha = 1.0
         }
         
         self.details = details
-        
+        updateElapsedTime()
         guard let theme = currentTheme else {
             return
         }
@@ -120,6 +129,20 @@ class VoiceMessagePlaybackView: UIView, NibLoadable, Themable {
         elapsedTimeLabel.textColor = theme.colors.tertiaryContent
     }
     
+    private func updateElapsedTime() {
+        guard let details = details,
+              !details.loading else {
+                  elapsedTimeLabel.text = "--:--"
+                  return
+              }
+        if let scrubProgress = scrubProgress,
+           let scrubTime = delegate?.voiceMessagePlaybackViewRequestedFormattedTimestamp(for: scrubProgress) {
+            elapsedTimeLabel.text = scrubTime
+        } else {
+            elapsedTimeLabel.text = details.currentTime
+        }
+    }
+    
     func getRequiredNumberOfSamples() -> Int {
         _waveformView.setNeedsLayout()
         _waveformView.layoutIfNeeded()
@@ -138,4 +161,31 @@ class VoiceMessagePlaybackView: UIView, NibLoadable, Themable {
     @IBAction private func onPlayButtonTap() {
         delegate?.voiceMessagePlaybackViewDidRequestPlaybackToggle()
     }
+    
+    @IBAction private func tap(gestureRecognizer: UITapGestureRecognizer) {
+        let x = gestureRecognizer.location(in: waveformContainerView).x.clamped(to: 0...waveformContainerView.bounds.width)
+        let progress = x / waveformContainerView.bounds.width
+        let seekPoint = progress == 1 ? 0 : progress
+        delegate?.voiceMessagePlaybackViewDidRequestSeek(to: seekPoint)
+    }
+    
+    @IBAction private func pan(gestureRecognizer: UIPanGestureRecognizer) {
+        switch gestureRecognizer.state {
+            
+        case .possible, .cancelled, .failed:
+            scrubProgress = nil
+        case .began, .changed:
+            let x = gestureRecognizer.location(in: waveformContainerView).x.clamped(to: 0...waveformContainerView.bounds.width)
+            scrubProgress = x / waveformContainerView.bounds.width
+        case .ended:
+            let seekPoint = scrubProgress == 1 ? 0 : scrubProgress ?? 0
+            MXLog.debug("progress end seekPoint --->\(seekPoint)")
+            delegate?.voiceMessagePlaybackViewDidRequestSeek(to: seekPoint)
+            scrubProgress = nil
+        @unknown default:
+            break
+        }
+        updateElapsedTime()
+    }
+
 }