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Grid.kt
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Grid.kt
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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.
*/
package com.example.jetsnack.ui.components
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.layout.Layout
/**
* A simple grid which lays elements out vertically in evenly sized [columns].
*/
@Composable
fun VerticalGrid(
modifier: Modifier = Modifier,
columns: Int = 2,
content: @Composable () -> Unit
) {
Layout(
content = content,
modifier = modifier
) { measurables, constraints ->
val itemWidth = constraints.maxWidth / columns
// Keep given height constraints, but set an exact width
val itemConstraints = constraints.copy(
minWidth = itemWidth,
maxWidth = itemWidth
)
// Measure each item with these constraints
val placeables = measurables.map { it.measure(itemConstraints) }
// Track each columns height so we can calculate the overall height
val columnHeights = Array(columns) { 0 }
placeables.forEachIndexed { index, placeable ->
val column = index % columns
columnHeights[column] += placeable.height
}
val height = (columnHeights.maxOrNull() ?: constraints.minHeight)
.coerceAtMost(constraints.maxHeight)
layout(
width = constraints.maxWidth,
height = height
) {
// Track the Y co-ord per column we have placed up to
val columnY = Array(columns) { 0 }
placeables.forEachIndexed { index, placeable ->
val column = index % columns
placeable.placeRelative(
x = column * itemWidth,
y = columnY[column]
)
columnY[column] += placeable.height
}
}
}
}