android: update styled slider thumb

android/app/src/main/java/me/kavishdevar/librepods/composables/StyledButton.kt

@@ -137,7 +137,7 @@ half4 main(float2 coord) {
                             }
                         },
                         onDrawFront = null,
-                        highlight = { Highlight.AmbientDefault.copy(alpha = 0f) }
+                        highlight = { Highlight.Ambient.copy(alpha = 0f) }
                     )
                 } else {
                     Modifier.drawBackdrop(

android/app/src/main/java/me/kavishdevar/librepods/composables/StyledIconButton.kt

@@ -124,7 +124,7 @@ half4 main(float2 coord) {
             .drawBackdrop(
                 backdrop = backdrop,
                 shape = { RoundedCornerShape(56.dp) },
-                highlight = { Highlight.AmbientDefault.copy(alpha = if (isDarkTheme) 1f else 0f) },
+                highlight = { Highlight.Ambient.copy(alpha = if (isDarkTheme) 1f else 0f) },
                 shadow = {
                     Shadow(
                         radius = 48f.dp,

android/app/src/main/java/me/kavishdevar/librepods/composables/StyledSlider.kt

@@ -21,6 +21,7 @@ package me.kavishdevar.librepods.composables
 import android.content.res.Configuration
 import android.util.Log
 import androidx.compose.animation.core.Animatable
+import androidx.compose.animation.core.FiniteAnimationSpec
 import androidx.compose.animation.core.spring
 import androidx.compose.foundation.background
 import androidx.compose.foundation.gestures.Orientation
@@ -46,21 +47,18 @@ import androidx.compose.runtime.MutableFloatState
 import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableFloatStateOf
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
-import androidx.compose.ui.graphics.BlendMode
-import androidx.compose.ui.graphics.BlurEffect
 import androidx.compose.ui.graphics.Color
-import androidx.compose.ui.graphics.TileMode
-import androidx.compose.ui.graphics.drawOutline
-import androidx.compose.ui.graphics.drawscope.translate
 import androidx.compose.ui.graphics.graphicsLayer
-import androidx.compose.ui.graphics.layer.CompositingStrategy
-import androidx.compose.ui.graphics.layer.drawLayer
-import androidx.compose.ui.graphics.rememberGraphicsLayer
+import androidx.compose.ui.input.pointer.pointerInput
+import androidx.compose.ui.input.pointer.util.VelocityTracker
+import androidx.compose.ui.input.pointer.util.addPointerInputChange
 import androidx.compose.ui.layout.layout
 import androidx.compose.ui.layout.onGloballyPositioned
 import androidx.compose.ui.layout.onSizeChanged
@@ -71,6 +69,7 @@ import androidx.compose.ui.text.font.Font
 import androidx.compose.ui.text.font.FontFamily
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.Velocity
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.compose.ui.util.fastCoerceIn
@@ -81,14 +80,129 @@ import com.kyant.backdrop.backdrops.layerBackdrop
 import com.kyant.backdrop.backdrops.rememberCombinedBackdrop
 import com.kyant.backdrop.backdrops.rememberLayerBackdrop
 import com.kyant.backdrop.drawBackdrop
+import com.kyant.backdrop.effects.blur
 import com.kyant.backdrop.effects.refractionWithDispersion
 import com.kyant.backdrop.highlight.Highlight
+import com.kyant.backdrop.shadow.InnerShadow
 import com.kyant.backdrop.shadow.Shadow
+import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.launch
 import me.kavishdevar.librepods.R
+import me.kavishdevar.librepods.utils.inspectDragGestures
 import kotlin.math.abs
 import kotlin.math.roundToInt
 
+@Composable
+fun rememberMomentumAnimation(
+    maxScale: Float,
+    progressAnimationSpec: FiniteAnimationSpec<Float> =
+        spring(1f, 1000f, 0.01f),
+    velocityAnimationSpec: FiniteAnimationSpec<Float> =
+        spring(0.5f, 250f, 5f),
+    scaleXAnimationSpec: FiniteAnimationSpec<Float> =
+        spring(0.4f, 400f, 0.01f),
+    scaleYAnimationSpec: FiniteAnimationSpec<Float> =
+        spring(0.6f, 400f, 0.01f)
+): MomentumAnimation {
+    val animationScope = rememberCoroutineScope()
+    return remember(
+        maxScale,
+        animationScope,
+        progressAnimationSpec,
+        velocityAnimationSpec,
+        scaleXAnimationSpec,
+        scaleYAnimationSpec
+    ) {
+        MomentumAnimation(
+            maxScale = maxScale,
+            animationScope = animationScope,
+            progressAnimationSpec = progressAnimationSpec,
+            velocityAnimationSpec = velocityAnimationSpec,
+            scaleXAnimationSpec = scaleXAnimationSpec,
+            scaleYAnimationSpec = scaleYAnimationSpec
+        )
+    }
+}
+
+class MomentumAnimation(
+    val maxScale: Float,
+    private val animationScope: CoroutineScope,
+    private val progressAnimationSpec: FiniteAnimationSpec<Float>,
+    private val velocityAnimationSpec: FiniteAnimationSpec<Float>,
+    private val scaleXAnimationSpec: FiniteAnimationSpec<Float>,
+    private val scaleYAnimationSpec: FiniteAnimationSpec<Float>
+) {
+
+    private val velocityTracker = VelocityTracker()
+
+    private val progressAnimation = Animatable(0f)
+    private val velocityAnimation = Animatable(0f)
+    private val scaleXAnimation = Animatable(1f)
+    private val scaleYAnimation = Animatable(1f)
+
+    val progress: Float get() = progressAnimation.value
+    val velocity: Float get() = velocityAnimation.value
+    val scaleX: Float get() = scaleXAnimation.value
+    val scaleY: Float get() = scaleYAnimation.value
+
+    var isDragging: Boolean by mutableStateOf(false)
+        private set
+
+    val modifier: Modifier = Modifier.pointerInput(Unit) {
+        inspectDragGestures(
+            onDragStart = {
+                isDragging = true
+                velocityTracker.resetTracking()
+                startPressingAnimation()
+            },
+            onDragEnd = { change ->
+                isDragging = false
+                val velocity = velocityTracker.calculateVelocity()
+                updateVelocity(velocity)
+                velocityTracker.addPointerInputChange(change)
+                velocityTracker.resetTracking()
+                endPressingAnimation()
+                settleVelocity()
+            },
+            onDragCancel = {
+                isDragging = false
+                velocityTracker.resetTracking()
+                endPressingAnimation()
+                settleVelocity()
+            }
+        ) { change, _ ->
+            isDragging = true
+            velocityTracker.addPointerInputChange(change)
+            val velocity = velocityTracker.calculateVelocity()
+            updateVelocity(velocity)
+        }
+    }
+
+    private fun updateVelocity(velocity: Velocity) {
+        animationScope.launch { velocityAnimation.animateTo(velocity.x, velocityAnimationSpec) }
+    }
+
+    private fun settleVelocity() {
+        animationScope.launch { velocityAnimation.animateTo(0f, velocityAnimationSpec) }
+    }
+
+    fun startPressingAnimation() {
+        animationScope.launch {
+            launch { progressAnimation.animateTo(1f, progressAnimationSpec) }
+            launch { scaleXAnimation.animateTo(maxScale, scaleXAnimationSpec) }
+            launch { scaleYAnimation.animateTo(maxScale, scaleYAnimationSpec) }
+        }
+    }
+
+    fun endPressingAnimation() {
+        animationScope.launch {
+            launch { progressAnimation.animateTo(0f, progressAnimationSpec) }
+            launch { scaleXAnimation.animateTo(1f, scaleXAnimationSpec) }
+            launch { scaleYAnimation.animateTo(1f, scaleYAnimationSpec) }
+        }
+    }
+}
+
 @Composable
 fun StyledSlider(
     label: String? = null,
@@ -122,14 +236,6 @@ fun StyledSlider(
         }
     }
 
-    val animationScope = rememberCoroutineScope()
-    val progressAnimationSpec = spring(0.5f, 300f, 0.001f)
-    val progressAnimation = remember { Animatable(0f) }
-    val innerShadowLayer =
-        rememberGraphicsLayer().apply {
-            compositingStrategy = CompositingStrategy.Offscreen
-        }
-
     val sliderBackdrop = rememberLayerBackdrop()
     val trackWidthState = remember { mutableFloatStateOf(0f) }
     val trackPositionState = remember { mutableFloatStateOf(0f) }
@@ -137,6 +243,8 @@ fun StyledSlider(
     val endIconWidthState = remember { mutableFloatStateOf(0f) }
     val density = LocalDensity.current
 
+    val momentumAnimation = rememberMomentumAnimation(maxScale = 1.5f)
+
     val content = @Composable {
         Box(
             Modifier
@@ -301,10 +409,22 @@ fun StyledSlider(
             Box(
                 Modifier
                     .graphicsLayer {
+//                        val startOffset =
+//                            if (startIcon != null) startIconWidthState.floatValue + with(density) { 24.dp.toPx() } else with(density) { 12.dp.toPx() }
+//                        translationX =
+//                            startOffset + fraction * trackWidthState.floatValue - size.width / 2f
                         val startOffset =
-                            if (startIcon != null) startIconWidthState.floatValue + with(density) { 24.dp.toPx() } else with(density) { 12.dp.toPx() }
+                            if (startIcon != null)
+                                startIconWidthState.floatValue + with(density) { 24.dp.toPx() }
+                            else
+                                with(density) { 8.dp.toPx() }
+
                         translationX =
-                            startOffset + fraction * trackWidthState.floatValue - size.width / 2f
+                            (startOffset + fraction * trackWidthState.floatValue - size.width / 2f)
+                                .fastCoerceIn(
+                                    startOffset - size.width / 4f,
+                                    startOffset + trackWidthState.floatValue - size.width * 3f / 4f
+                                )
                         translationY =  if (startLabel != null || endLabel != null) trackPositionState.floatValue + with(density) { 26.dp.toPx() } + size.height / 2f else trackPositionState.floatValue + with(density) { 8.dp.toPx() }
                     }
                     .draggable(
@@ -326,23 +446,20 @@ fun StyledSlider(
                         Orientation.Horizontal,
                         startDragImmediately = true,
                         onDragStarted = {
-                            animationScope.launch {
-                                progressAnimation.animateTo(1f, progressAnimationSpec)
-                            }
+                            // Remove this block as momentumAnimation handles pressing
                         },
                         onDragStopped = {
-                            animationScope.launch {
-                                progressAnimation.animateTo(0f, progressAnimationSpec)
-                                onValueChange((mutableFloatState.floatValue * 100).roundToInt() / 100f)
-                            }
+                            // Remove this block as momentumAnimation handles pressing
+                            onValueChange((mutableFloatState.floatValue * 100).roundToInt() / 100f)
                         }
                     )
+                    .then(momentumAnimation.modifier)
                     .drawBackdrop(
                         rememberCombinedBackdrop(backdrop, sliderBackdrop),
                         { RoundedCornerShape(28.dp) },
                         highlight = {
-                            val progress = progressAnimation.value
-                            Highlight.AmbientDefault.copy(alpha = progress)
+                            val progress = momentumAnimation.progress
+                            Highlight.Ambient.copy(alpha = progress)
                         },
                         shadow = {
                             Shadow(
@@ -350,43 +467,31 @@ fun StyledSlider(
                                 color = Color.Black.copy(0.05f)
                             )
                         },
+                        innerShadow = {
+                            val progress = momentumAnimation.progress
+                            InnerShadow(
+                                radius = 4f.dp * progress,
+                                alpha = progress
+                            )
+                        },
                         layerBlock = {
-                            val progress = progressAnimation.value
-                            val scale = lerp(1f, 1.5f, progress)
-                            scaleX = scale
-                            scaleY = scale
+                            scaleX = momentumAnimation.scaleX
+                            scaleY = momentumAnimation.scaleY
+                            val velocity = momentumAnimation.velocity / 5000f
+                            scaleX /= 1f - (velocity * 0.75f).fastCoerceIn(-0.15f, 0.15f)
+                            scaleY *= 1f - (velocity * 0.25f).fastCoerceIn(-0.15f, 0.15f)
                         },
                         onDrawSurface = {
-                            val progress = progressAnimation.value.fastCoerceIn(0f, 1f)
-
-                            val shape = RoundedCornerShape(28.dp)
-                            val outline = shape.createOutline(size, layoutDirection, this)
-                            val innerShadowOffset = 4f.dp.toPx()
-                            val innerShadowBlurRadius = 4f.dp.toPx()
-
-                            innerShadowLayer.alpha = progress
-                            innerShadowLayer.renderEffect =
-                                BlurEffect(
-                                    innerShadowBlurRadius,
-                                    innerShadowBlurRadius,
-                                    TileMode.Decal
-                                )
-                            innerShadowLayer.record {
-                                drawOutline(outline, Color.Black.copy(0.2f))
-                                translate(0f, innerShadowOffset) {
-                                    drawOutline(
-                                        outline,
-                                        Color.Transparent,
-                                        blendMode = BlendMode.Clear
-                                    )
-                                }
-                            }
-                            drawLayer(innerShadowLayer)
-
-                            drawRect(Color.White.copy(1f - progress))
+                            val progress = momentumAnimation.progress
+                            drawRect(Color.White.copy(alpha = 1f - progress))
                         },
                         effects = {
-                            refractionWithDispersion(6f.dp.toPx(), size.height / 2f)
+                            val progress = momentumAnimation.progress
+                            blur(8f.dp.toPx() * (1f - progress))
+                            refractionWithDispersion(
+                                height = 6f.dp.toPx() * progress,
+                                amount = size.height / 2f * progress
+                            )
                         }
                     )
                     .size(40f.dp, 24f.dp)
@@ -454,7 +559,7 @@ private fun snapIfClose(value: Float, points: List<Float>, threshold: Float = 0.
 @Preview(uiMode = Configuration.UI_MODE_NIGHT_YES)
 @Composable
 fun StyledSliderPreview() {
-    val a = remember { mutableFloatStateOf(1f) }
+    val a = remember { mutableFloatStateOf(0.5f) }
     Box(
         Modifier
             .background(if (isSystemInDarkTheme()) Color(0xFF000000) else Color(0xFFF0F0F0))
@@ -471,11 +576,11 @@ fun StyledSliderPreview() {
                     a.floatValue = it
                 },
                 valueRange = 0f..2f,
-                snapPoints = listOf(0f, 0.5f, 1f, 1.5f, 2f),
+                snapPoints = listOf(1f),
                 snapThreshold = 0.1f,
                 independent = true,
-                startLabel = "A",
-                endLabel = "B",
+                startIcon = "A",
+                endIcon = "B",
             )
         }
     }

android/app/src/main/java/me/kavishdevar/librepods/composables/StyledSwitch.kt

@@ -176,7 +176,7 @@ fun StyledSwitch(
                     { RoundedCornerShape(thumbHeight / 2) },
                     highlight = {
                         val progress = progressAnimation.value
-                        Highlight.AmbientDefault.copy(
+                        Highlight.Ambient.copy(
                             alpha = progress
                         )
                     },

android/app/src/main/java/me/kavishdevar/librepods/screens/AirPodsSettingsScreen.kt

@@ -310,7 +310,7 @@ fun AirPodsSettingsScreen(dev: BluetoothDevice?, service: AirPodsService,
                         exportedBackdrop = backdrop,
                         shape = { RoundedCornerShape(0.dp) },
                         highlight = {
-                            Highlight.AmbientDefault.copy(alpha = 0f)
+                            Highlight.Ambient.copy(alpha = 0f)
                         }
                     )
                     .padding(horizontal = 8.dp),