AlbumArt.kt
Each line, with the release that last changed it.
| 0.5.0 | 1 | package dev.stave.ui.components |
| 2 | ||
| 3 | import androidx.compose.foundation.Image | |
| 4 | import androidx.compose.foundation.background | |
| 5 | import androidx.compose.foundation.layout.Box | |
| 6 | import androidx.compose.foundation.layout.fillMaxSize | |
| 7 | import androidx.compose.runtime.Composable | |
| 8 | import androidx.compose.runtime.getValue | |
| 9 | import androidx.compose.runtime.mutableStateOf | |
| 10 | import androidx.compose.runtime.remember | |
| 11 | import androidx.compose.runtime.setValue | |
| 12 | import androidx.compose.ui.Alignment | |
| 13 | import androidx.compose.ui.Modifier | |
| 14 | import androidx.compose.ui.layout.ContentScale | |
| 15 | import androidx.compose.ui.res.painterResource | |
| 16 | import coil3.compose.AsyncImage | |
| 17 | import dev.stave.ui.theme.SurfaceDivider | |
| 18 | ||
| 19 | /** | |
| 20 | * Album art with Earhorn brand fallback. When [model] (the album art URI) is null, | |
| 21 | * blank, or **fails to load** (unreachable server, corrupt image, etc.), renders a | |
| 22 | * SurfaceDivider backplate with the Earhorn brand mark as a centered 50%-size | |
| 23 | * watermark. | |
| 24 | * | |
| 25 | * Caller controls size via [modifier]; backplate and content scale are internal. | |
| 26 | * Callers that want rounded corners should apply .clip() via modifier before | |
| 27 | * passing in. | |
| 28 | */ | |
| 29 | @Composable | |
| 30 | fun AlbumArt( | |
| 31 | model: Any?, | |
| 32 | modifier: Modifier = Modifier, | |
| 33 | contentScale: ContentScale = ContentScale.Crop, | |
| 34 | ) { | |
| 35 | val uriBlank = when (model) { | |
| 36 | null -> true | |
| 37 | is String -> model.isBlank() | |
| 38 | else -> false | |
| 39 | } | |
| 40 | ||
| 41 | // The last model that successfully rendered. While a NEW model is | |
| 42 | // loading, AsyncImage draws nothing — without this, the backplate | |
| 43 | // (and brand badge) flashed through at every track boundary. | |
| 44 | var lastGood by remember { mutableStateOf<Any?>(null) } | |
| 45 | ||
| 46 | Box( | |
| 47 | modifier = modifier.background(SurfaceDivider), | |
| 48 | contentAlignment = Alignment.Center, | |
| 49 | ) { | |
| 50 | if (uriBlank) { | |
| 51 | Image( | |
| 52 | painter = painterResource(id = dev.stave.R.drawable.earhorn_badge), | |
| 53 | contentDescription = null, | |
| 54 | modifier = Modifier.fillMaxSize(0.5f), | |
| 55 | ) | |
| 56 | } else { | |
| 57 | var loadFailed by remember(model) { mutableStateOf(false) } | |
| 58 | if (loadFailed && lastGood == null) { | |
| 59 | Image( | |
| 60 | painter = painterResource(id = dev.stave.R.drawable.earhorn_badge), | |
| 61 | contentDescription = null, | |
| 62 | modifier = Modifier.fillMaxSize(0.5f), | |
| 63 | ) | |
| 64 | } | |
| 65 | // Previous art underlay — drawn while the current model | |
| 66 | // differs from the last successful one (a load is in flight | |
| 67 | // or failed). Coil serves it from memory cache, so it stays | |
| 68 | // painted with no visible gap: same-art transitions show no | |
| 69 | // change at all; new-art transitions swap old→new directly | |
| 70 | // with no interstitial backplate/badge flash. | |
| 71 | if (lastGood != null && lastGood != model) { | |
| 72 | AsyncImage( | |
| 73 | model = lastGood, | |
| 74 | contentDescription = null, | |
| 75 | contentScale = contentScale, | |
| 76 | modifier = Modifier.fillMaxSize(), | |
| 77 | ) | |
| 78 | } | |
| 79 | AsyncImage( | |
| 80 | model = model, | |
| 81 | contentDescription = null, | |
| 82 | contentScale = contentScale, | |
| 83 | modifier = Modifier.fillMaxSize(), | |
| 84 | onError = { loadFailed = true }, | |
| 85 | onSuccess = { | |
| 86 | loadFailed = false | |
| 87 | lastGood = model | |
| 88 | }, | |
| 89 | ) | |
| 90 | } | |
| 91 | } | |
| 92 | } |