Add smooth animation to voice messages play progress (#7698)

* Add linear animation to voice message playback progress

Instead of animating the small `progress` value changes, calculate an animation for the range `maxProgress - progress`, with a linear interpolator so it's completely smooth. Previously, the progress was updated in 'steps' that were quite noticeable.

libraries/voiceplayer/api/src/main/kotlin/io/element/android/libraries/voiceplayer/api/VoiceMessageState.kt

@@ -13,7 +13,9 @@ data class VoiceMessageState(
     val progress: Float,
     val time: String,
     val showCursor: Boolean,
+    val isPlaying: Boolean,
     val playbackSpeed: Float,
+    val durationMs: Long,
     val eventSink: (event: VoiceMessageEvent) -> Unit,
 ) {
     enum class ButtonType {

libraries/voiceplayer/api/src/main/kotlin/io/element/android/libraries/voiceplayer/api/VoiceMessageStatePreviewParam.kt

@@ -34,6 +34,8 @@ open class VoiceMessageStatePreviewParam : PreviewParameterProvider<VoiceMessage
                 progress = 0.2f,
                 time = "10:00",
                 showCursor = true,
+                isPlaying = true,
+                durationMs = 0,
             ),
             aVoiceMessageState(
                 VoiceMessageState.ButtonType.Disabled,
@@ -48,12 +50,16 @@ fun aVoiceMessageState(
     progress: Float = 0f,
     time: String = "1:00",
     showCursor: Boolean = false,
+    isPlaying: Boolean = false,
     playbackSpeed: Float = 1.0f,
+    durationMs: Long = 60_000,
 ) = VoiceMessageState(
     buttonType = buttonType,
     progress = progress,
     time = time,
     showCursor = showCursor,
+    isPlaying = isPlaying,
     playbackSpeed = playbackSpeed,
+    durationMs = durationMs,
     eventSink = {},
 )

libraries/voiceplayer/impl/src/main/kotlin/io/element/android/libraries/voiceplayer/impl/VoiceMessagePresenter.kt

@@ -135,7 +135,9 @@ class VoiceMessagePresenter(
             progress = progress,
             time = time,
             showCursor = showCursor,
+            isPlaying = playerState.isPlaying,
             playbackSpeed = VoicePlayerConfig.availablePlaybackSpeeds[playbackSpeedIndex],
+            durationMs = duration,
             eventSink = ::handleEvent,
         )
     }

libraries/voiceplayer/impl/src/test/kotlin/io/element/android/libraries/voiceplayer/impl/VoiceMessagePresenterTest.kt

@@ -34,6 +34,8 @@ class VoiceMessagePresenterTest {
                 assertThat(it.buttonType).isEqualTo(VoiceMessageState.ButtonType.Play)
                 assertThat(it.progress).isEqualTo(0f)
                 assertThat(it.time).isEqualTo("1:01")
+                assertThat(it.isPlaying).isFalse()
+                assertThat(it.durationMs).isEqualTo(61_000)
             }
         }
     }