fix(stores): let a game's description fill the free height of the page (#1493)

Co-authored-by: Kurt Himebauch <136133082+xXJSONDeruloXx@users.noreply.github.com>

app/src/main/java/com/droiddeck/launcher/ui/CardDetailHost.kt

@@ -12,6 +12,7 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.verticalScroll
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
+import androidx.compose.runtime.compositionLocalOf
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
@@ -37,6 +38,8 @@ import androidx.compose.runtime.setValue
 import androidx.compose.runtime.getValue
 
 /** A grid of cards with a game page that floods out of the opened card and drains back into it. */
+internal val LocalDetailFloor = compositionLocalOf<() -> Float> { { Float.MAX_VALUE } }
+
 @OptIn(androidx.compose.ui.ExperimentalComposeUiApi::class)
 @Composable
 internal fun CardDetailHost(
@@ -57,6 +60,7 @@ internal fun CardDetailHost(
     var from by remember { mutableStateOf<Origin?>(null) }
     var art by remember { mutableStateOf<String?>(null) }
     var viewportAt by remember { mutableStateOf(Offset.Zero) }
+    var viewportH by remember { mutableStateOf(0) }
     LaunchedEffect(open) {
         if (open != null) {
             val mark = StoresMotion.takeCard(open)
@@ -83,7 +87,7 @@ internal fun CardDetailHost(
     val fade = with(density) { 14.dp.toPx() }
     Box(
         modifier.clipToBounds()
-            .onGloballyPositioned { viewportAt = it.positionInRoot() }
+            .onGloballyPositioned { viewportAt = it.positionInRoot(); viewportH = it.size.height }
             .graphicsLayer { compositingStrategy = androidx.compose.ui.graphics.CompositingStrategy.Offscreen }
             .drawWithContent {
                 drawContent()
@@ -114,7 +118,10 @@ internal fun CardDetailHost(
                                 .onFocusChanged { onDetailFocus(it.hasFocus) }
                                 .focusProperties { exit = { if (coveringNow.value && Steps.step == null && StoresMotion.step == null) FocusRequester.Cancel else FocusRequester.Default } }
                                 .focusGroup(),
-                        ) { detail(key) }
+                        ) {
+                            val floor = { viewportAt.y + viewportH - with(density) { 16.dp.toPx() } - detailScroll.value }
+                            CompositionLocalProvider(LocalDetailFloor provides floor) { detail(key) }
+                        }
                     }
                 }
                 val origin = from

app/src/main/java/com/droiddeck/launcher/ui/GameDetail.kt

@@ -56,6 +56,8 @@ import androidx.compose.ui.input.key.onPreviewKeyEvent
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.layout.boundsInRoot
 import androidx.compose.ui.layout.onGloballyPositioned
+import androidx.compose.ui.layout.positionInRoot
+import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.testTag
@@ -599,7 +601,13 @@ private fun AboutTab(developer: String, publisher: String, releaseDate: String,
             val parts = listOf(developer, publisher, com.droiddeck.launcher.stores.GameFacts.releaseLabel(releaseDate).orEmpty()).filter { it.isNotBlank() }.distinct()
             Text(parts.joinToString(" · "), fontSize = 13.sp, color = MaterialTheme.colorScheme.onSurfaceVariant, modifier = Modifier.readable())
         }
-        if (description.isNotBlank()) StoreAbout(description, AboutHeight, Modifier.fillMaxWidth())
+        if (description.isNotBlank()) {
+            val floor = LocalDetailFloor.current
+            val density = LocalDensity.current
+            var room by remember { mutableStateOf(AboutHeight) }
+            val fill = Modifier.onGloballyPositioned { c -> room = maxOf(AboutHeight, with(density) { (floor() - c.positionInRoot().y).toDp() - 14.dp }) }
+            StoreAbout(description, room, Modifier.fillMaxWidth().then(fill))
+        }
     }
 }