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A simple staggered grid implementation based on https://github.com/elye/demo_android_jetpack_compose_staggered_vertical_grid
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/* | |
* Copyright 2020 The Android Open Source Project | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* https://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
import androidx.compose.runtime.Composable | |
import androidx.compose.ui.Modifier | |
import androidx.compose.ui.layout.Layout | |
import androidx.compose.ui.layout.Placeable | |
import androidx.compose.ui.unit.Dp | |
import androidx.compose.ui.unit.dp | |
import kotlin.math.ceil | |
@Composable | |
fun StaggeredVerticalGrid( | |
maxColumnWidth: Dp, | |
modifier: Modifier = Modifier, | |
cellPadding: Dp = 8.dp, | |
content: @Composable () -> Unit | |
) { | |
Layout( | |
content = content, | |
modifier = modifier | |
) { measurables, constraints -> | |
val cellPaddingPx = cellPadding.roundToPx() | |
val placeableXY: MutableMap<Placeable, Pair<Int, Int>> = mutableMapOf() | |
check(constraints.hasBoundedWidth) { | |
"Unbounded width not supported" | |
} | |
val columns = ceil(constraints.maxWidth / maxColumnWidth.toPx()).toInt() | |
val columnWidth = (constraints.maxWidth / columns) - (cellPaddingPx / 2) | |
val columnHeights = IntArray(columns) { 0 } // track each column's height | |
val itemConstraints = constraints.copy(maxWidth = columnWidth) | |
val placeables = measurables.map { measurable -> | |
val column = shortestColumn(columnHeights) | |
val placeable = measurable.measure(itemConstraints) | |
placeableXY[placeable] = Pair((columnWidth + cellPaddingPx) * column, columnHeights[column]) | |
columnHeights[column] += placeable.height + cellPaddingPx | |
placeable | |
} | |
val height = columnHeights.maxOrNull() | |
?.coerceIn(constraints.minHeight, constraints.maxHeight) | |
?: constraints.minHeight | |
layout( | |
width = constraints.maxWidth, | |
height = height | |
) { | |
placeables.forEach { placeable -> | |
placeable.place( | |
x = placeableXY.getValue(placeable).first, | |
y = placeableXY.getValue(placeable).second | |
) | |
} | |
} | |
} | |
} | |
private fun shortestColumn(colHeights: IntArray): Int { | |
var minHeight = Int.MAX_VALUE | |
var column = 0 | |
colHeights.forEachIndexed { index, height -> | |
if (height < minHeight) { | |
minHeight = height | |
column = index | |
} | |
} | |
return column | |
} |
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You can check out the article on how to create your own staggered grid layouts here