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Equal size tiles
Author: Francesc Vilariño Güell
Custom layout to constraint and place children in slots of equal dimensions using a single measure pass
| @Composable | |
| fun EqualSizeTiles( | |
| modifier: Modifier = Modifier, | |
| content: @Composable () -> Unit, | |
| ) { | |
| Layout( | |
| content = content, | |
| modifier = modifier, | |
| ) { measurables, constraints -> | |
| layoutTiles( | |
| measurables, | |
| constraints | |
| ) | |
| } | |
| } | |
| private fun MeasureScope.layoutTiles( | |
| measurables: List<Measurable>, | |
| constraints: Constraints, | |
| ): MeasureResult { | |
| val tileHeight = constraints.maxHeight | |
| val tileWidths = measurables.map { measurable -> | |
| measurable.maxIntrinsicWidth(tileHeight) | |
| } | |
| val tileWidth = tileWidths.maxOrNull() ?: 0 | |
| val tileConstraints = Constraints( | |
| minWidth = tileWidth, | |
| minHeight = 0, | |
| maxWidth = tileWidth, | |
| maxHeight = constraints.maxHeight, | |
| ) | |
| val placeables = measurables.map { measurable -> | |
| measurable.measure(tileConstraints) | |
| } | |
| val width = (placeables.size * tileWidth).coerceAtMost(constraints.maxWidth) | |
| return layout(width = width, height = tileHeight) { | |
| placeables.forEachIndexed { index, placeable -> | |
| placeable.place(tileWidth * index, 0) | |
| } | |
| } | |
| } | |
| @Preview(showBackground = true) | |
| @Composable | |
| private fun EqualSizeTilesPreview() { | |
| WeatherSampleTheme { | |
| Surface(modifier = Modifier | |
| .width(512.dp) | |
| .background(color = Color.Yellow)) { | |
| EqualSizeTiles( | |
| modifier = Modifier | |
| .height(64.dp) | |
| .background(color = Color.Green) | |
| .padding(all = 8.dp) | |
| ) { | |
| Text( | |
| text = "Left", | |
| textAlign = TextAlign.Center, | |
| modifier = Modifier | |
| .background(color = Color.Red) | |
| .padding(all = 8.dp) | |
| .fillMaxHeight(), | |
| ) | |
| Text( | |
| text = "Center", | |
| textAlign = TextAlign.Center, | |
| modifier = Modifier | |
| .background(color = Color.Yellow) | |
| .padding(all = 8.dp) | |
| .fillMaxHeight(), | |
| ) | |
| Text( | |
| text = "Right element", | |
| textAlign = TextAlign.Center, | |
| modifier = Modifier | |
| .background(color = Color.Blue) | |
| .padding(all = 8.dp) | |
| .fillMaxHeight(), | |
| ) | |
| } | |
| } | |
| } | |
| } |
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