new: allow user to seek a position in the record

shared/src/commonMain/kotlin/fr/ajaury/gwenedeg/player/ui/PlayerScreen.kt

@@ -18,14 +18,17 @@ import androidx.compose.material3.Button
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
-import androidx.compose.material3.LinearProgressIndicator
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Slider
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
 import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.vector.ImageVector
@@ -58,6 +61,7 @@ fun PlayerScreen(
         recordTitle = recordTitle,
         uiState = uiState,
         onMainPlayActionButtonClicked = viewModel::performMainPlayAction,
+        onSeek = viewModel::seekTo,
         onBackClicked = onBackClicked,
     )
 }
@@ -68,6 +72,7 @@ fun PlayerScreen(
     recordTitle: String,
     uiState: PlayerUiState,
     onMainPlayActionButtonClicked: () -> Unit,
+    onSeek: (progress: Float) -> Unit,
     onBackClicked: () -> Unit,
 ) {
     Scaffold(
@@ -103,8 +108,18 @@ fun PlayerScreen(
 
                 Spacer(modifier = Modifier.weight(1f))
 
-                LinearProgressIndicator(
-                    progress = { uiState.progress },
+                var seekProgress by remember { mutableStateOf<Float?>(null) }
+                Slider(
+                    value = seekProgress ?: uiState.progress,
+                    onValueChange = { seekProgress = it },
+                    onValueChangeFinished = {
+                        seekProgress?.let { fraction ->
+                            if (uiState.durationMs > 0) {
+                                onSeek(fraction)
+                            }
+                        }
+                        seekProgress = null
+                    },
                     modifier = Modifier.fillMaxWidth(),
                 )
 
@@ -145,6 +160,7 @@ private fun PlayerScreenPlayingPreview() {
             recordTitle = "Demat",
             uiState = PlayerUiState(playbackState = PlaybackState.PLAYING, positionMs = 1234, durationMs = 5000),
             onMainPlayActionButtonClicked = {},
+            onSeek = {},
             onBackClicked = {},
         )
     }
@@ -158,6 +174,7 @@ private fun PlayerScreenPausedPreview() {
             recordTitle = "Demat",
             uiState = PlayerUiState(playbackState = PlaybackState.PAUSED, positionMs = 1234, durationMs = 5000),
             onMainPlayActionButtonClicked = {},
+            onSeek = {},
             onBackClicked = {},
         )
     }
@@ -171,6 +188,7 @@ private fun PlayerScreenEndedPreview() {
             recordTitle = "Demat",
             uiState = PlayerUiState(playbackState = PlaybackState.ENDED, positionMs = 1234, durationMs = 5000),
             onMainPlayActionButtonClicked = {},
+            onSeek = {},
             onBackClicked = {},
         )
     }

shared/src/commonMain/kotlin/fr/ajaury/gwenedeg/player/ui/viewmodel/PlayerViewModel.kt

@@ -81,6 +81,11 @@ class PlayerViewModel(
         }
     }
 
+    fun seekTo(progress: Float) {
+        val position = (progress.toDouble() * uiState.value.durationMs).milliseconds
+        audioPlayer.seekTo(position)
+    }
+
     fun stop() {
         audioPlayer.stop()
     }