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@darvld
Last active August 8, 2022 05:14
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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
}
@darvld
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darvld commented Apr 9, 2022

You can check out the article on how to create your own staggered grid layouts here

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