Created
March 11, 2025 22:55
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Jetpack Compose size modifiers that skip recomposition
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package com.elyesmsr.sizemodifier | |
import androidx.compose.ui.Modifier | |
import androidx.compose.ui.layout.layout | |
import androidx.compose.ui.unit.Constraints | |
import androidx.compose.ui.unit.Density | |
import androidx.compose.ui.unit.Dp | |
import androidx.compose.ui.unit.DpSize | |
import androidx.compose.ui.unit.constrain | |
fun Modifier.width(width: () -> Dp) = dpSize { DpSize(width = width(), height = Dp.Unspecified) } | |
fun Modifier.height(height: () -> Dp) = dpSize { DpSize(height = height(), width = Dp.Unspecified) } | |
fun Modifier.size(width: () -> Dp, height: () -> Dp) = dpSize { DpSize(width = width(), height = height()) } | |
fun Modifier.size(size: () -> Dp) = dpSize { DpSize(size(), size()) } | |
fun Modifier.dpSize(size: () -> DpSize) = layout { measurable, constraints -> | |
val width = size().width | |
val height = size().height | |
val targetConstraints = targetConstraints( | |
width = width, | |
height = height, | |
incomingConstraints = constraints | |
) | |
val placeable = measurable.measure(targetConstraints) | |
layout(placeable.width, placeable.height) { | |
placeable.placeRelative(0, 0) | |
} | |
} | |
/** | |
* Modified version of the code in androidx.compose.foundation.layout.SizeNode | |
*/ | |
private fun Density.targetConstraints(width: Dp, height: Dp, incomingConstraints: Constraints): Constraints { | |
val maxWidth = if (width != Dp.Unspecified) { | |
width.roundToPx().coerceAtLeast(0) | |
} else { | |
Constraints.Infinity | |
} | |
val maxHeight = if (height != Dp.Unspecified) { | |
height.roundToPx().coerceAtLeast(0) | |
} else { | |
Constraints.Infinity | |
} | |
val minWidth = if (width != Dp.Unspecified) { | |
width.roundToPx().coerceAtMost(maxWidth).coerceAtLeast(0).let { | |
if (it != Constraints.Infinity) it else 0 | |
} | |
} else { | |
0 | |
} | |
val minHeight = if (height != Dp.Unspecified) { | |
height.roundToPx().coerceAtMost(maxHeight).coerceAtLeast(0).let { | |
if (it != Constraints.Infinity) it else 0 | |
} | |
} else { | |
0 | |
} | |
return incomingConstraints.constrain( | |
Constraints( | |
minWidth = minWidth, | |
minHeight = minHeight, | |
maxWidth = maxWidth, | |
maxHeight = maxHeight | |
) | |
) | |
} |
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