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Fade Wear chat at screen contour

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This commit is contained in:
callebtc 2026-08-26 11:56:00 +02:00
parent 898cfde066
commit 3ed46222ba
1 changed files with 48 additions and 4 deletions
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52
wear/src/main/java/com/bitchat/watch/ui/ChatScaffold.kt
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@ -20,12 +20,18 @@ import androidx.compose.runtime.setValue
import androidx.compose.runtime.snapshotFlow
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.drawWithContent
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Rect
import androidx.compose.ui.graphics.BlendMode
import androidx.compose.ui.graphics.Brush
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.CompositingStrategy
import androidx.compose.ui.graphics.graphicsLayer
import androidx.compose.ui.input.pointer.PointerEventPass
import androidx.compose.ui.input.pointer.changedToUp
import androidx.compose.ui.input.pointer.pointerInput
import androidx.compose.ui.platform.LocalConfiguration
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.platform.LocalLayoutDirection
import androidx.compose.ui.text.style.TextAlign
@ -209,6 +215,7 @@ private fun ChatBody(
val palette = LocalBitchatPalette.current
val context = LocalContext.current
val transformationSpec = rememberTransformationSpec()
val isScreenRound = LocalConfiguration.current.isScreenRound
// Slide-to-cancel: while recording, the finger's position is tracked globally; the
// overlay's mic button reports its bounds and becomes the cancel target when the
// finger hovers it (with generous slack so the snap engages on approach).
@ -283,10 +290,44 @@ private fun ChatBody(
val layoutDirection = LocalLayoutDirection.current
TransformingLazyColumn(
state = columnState,
// Keep the list full-screen and unclipped. Wear's transformation spec scales
// and fades rows naturally along the round display edge, including underneath
// the transparent header and floating action controls.
modifier = Modifier.fillMaxSize(),
// Keep the list full-screen and geometrically unclipped. Wear's transformation
// spec curves rows along the round display; a soft destination-alpha mask then
// makes them fully transparent at the physical edges instead of cutting glyphs.
modifier = Modifier
.fillMaxSize()
.graphicsLayer {
compositingStrategy = CompositingStrategy.Offscreen
}
.drawWithContent {
drawContent()
val edgeMask = if (isScreenRound) {
// Fade toward the actual circular contour so glyphs become
// transparent before the panel can crop their left or right edge.
Brush.radialGradient(
0f to Color.Black,
CHAT_ROUND_EDGE_OPAQUE_STOP to Color.Black,
1f to Color.Transparent,
center = Offset(size.width / 2f, size.height / 2f),
radius = size.minDimension / 2f
)
} else {
val topOpaqueStop =
(CHAT_HEADER_EDGE_FADE.toPx() / size.height).coerceIn(0f, 1f)
val bottomOpaqueStop =
(1f - CHAT_ACTION_BAR_EDGE_FADE.toPx() / size.height)
.coerceIn(topOpaqueStop, 1f)
Brush.verticalGradient(
0f to Color.Transparent,
topOpaqueStop to Color.Black,
bottomOpaqueStop to Color.Black,
1f to Color.Transparent
)
}
drawRect(
brush = edgeMask,
blendMode = BlendMode.DstIn
)
},
// Arrangement.Bottom anchors short content to the bottom: the first message
// starts just above the action bar and new messages push history upward.
// The scroll range reserves resting space for the floating controls while the
@ -377,6 +418,9 @@ private const val CANCEL_HOVER_SLANT_PX = 56f
private const val CHAT_SCROLL_DIRECTION_THRESHOLD_PX = 24
private val CHAT_HEADER_CONTENT_CLEARANCE = 30.dp
private val CHAT_ACTION_BAR_CLEARANCE = 64.dp
private val CHAT_HEADER_EDGE_FADE = 36.dp
private val CHAT_ACTION_BAR_EDGE_FADE = 72.dp
private const val CHAT_ROUND_EDGE_OPAQUE_STOP = 0.78f
// Magnetic zone geometry (px at watch density): the button starts reacting at
// MAGNET_OUTER_PX from its center and fully blushes at MAGNET_INNER_PX (~the activation
// boundary); it leans toward the finger by up to MAGNET_PULL_PX.