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Constrain unbounded dimensions when exactly one dimension is unbounded (
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lottie-compose/src/main/java/com/airbnb/lottie/compose/LottieAnimationSizeNode.kt
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| @@ -0,0 +1,107 @@ | ||
| package com.airbnb.lottie.compose | ||
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| import androidx.compose.runtime.Stable | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.geometry.Size | ||
| import androidx.compose.ui.layout.Measurable | ||
| import androidx.compose.ui.layout.MeasureResult | ||
| import androidx.compose.ui.layout.MeasureScope | ||
| import androidx.compose.ui.layout.ScaleFactor | ||
| import androidx.compose.ui.node.LayoutModifierNode | ||
| import androidx.compose.ui.node.ModifierNodeElement | ||
| import androidx.compose.ui.platform.InspectorInfo | ||
| import androidx.compose.ui.unit.Constraints | ||
| import androidx.compose.ui.unit.IntSize | ||
| import androidx.compose.ui.unit.constrain | ||
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| /** | ||
| * Custom layout modifier that Lottie uses instead of the normal size modifier. | ||
| * | ||
| * This modifier will: | ||
| * * Attempt to size the composable to width/height (which is set to the composition bounds) | ||
| * * Constrain the size to the incoming constraints | ||
| * | ||
| * However, if the incoming constraints are unbounded in exactly one dimension, it will constrain that | ||
| * dimension to maintain the correct aspect ratio of the composition. | ||
| */ | ||
| @Stable | ||
| internal fun Modifier.lottieSize( | ||
| width: Int, | ||
| height: Int, | ||
| ) = this.then(LottieAnimationSizeElement(width, height)) | ||
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| internal data class LottieAnimationSizeElement( | ||
| val width: Int, | ||
| val height: Int, | ||
| ) : ModifierNodeElement<LottieAnimationSizeNode>() { | ||
| override fun create(): LottieAnimationSizeNode { | ||
| return LottieAnimationSizeNode(width, height) | ||
| } | ||
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| override fun update(node: LottieAnimationSizeNode) { | ||
| node.width = width | ||
| node.height = height | ||
| } | ||
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| override fun InspectorInfo.inspectableProperties() { | ||
| name = "Lottie Size" | ||
| properties["width"] = width | ||
| properties["height"] = height | ||
| } | ||
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| override fun equals(other: Any?): Boolean { | ||
| if (this === other) return true | ||
| if (other !is LottieAnimationSizeElement) return false | ||
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| if (width != other.width) return false | ||
| if (height != other.height) return false | ||
| return true | ||
| } | ||
|
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| override fun hashCode(): Int { | ||
| var result = width.hashCode() | ||
| result = 31 * result + height.hashCode() | ||
| return result | ||
| } | ||
| } | ||
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| internal class LottieAnimationSizeNode( | ||
| var width: Int, | ||
| var height: Int, | ||
| ) : Modifier.Node(), LayoutModifierNode { | ||
| override fun MeasureScope.measure(measurable: Measurable, constraints: Constraints): MeasureResult { | ||
| val constrainedSize = constraints.constrain(IntSize(width, height)) | ||
| val wrappedConstraints = when { | ||
| // We are constrained in the width dimension but not the height dimension. | ||
| constraints.maxHeight == Constraints.Infinity && constraints.maxWidth != Constraints.Infinity -> Constraints( | ||
| minWidth = constrainedSize.width, | ||
| maxWidth = constrainedSize.width, | ||
| minHeight = constrainedSize.width * height / width, | ||
| maxHeight = constrainedSize.width * height / width, | ||
| ) | ||
| // We are constrained in the height dimension but not the width dimension. | ||
| constraints.maxWidth == Constraints.Infinity && constraints.maxHeight != Constraints.Infinity -> Constraints( | ||
| minWidth = constrainedSize.height * width / height, | ||
| maxWidth = constrainedSize.height * width / height, | ||
| minHeight = constrainedSize.height, | ||
| maxHeight = constrainedSize.height, | ||
| ) | ||
| // We are constrained in both or neither dimension. Use the constrained size. | ||
| else -> Constraints( | ||
| minWidth = constrainedSize.width, | ||
| maxWidth = constrainedSize.width, | ||
| minHeight = constrainedSize.height, | ||
| maxHeight = constrainedSize.height, | ||
| ) | ||
| } | ||
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| val placeable = measurable.measure(wrappedConstraints) | ||
| return layout(placeable.width, placeable.height) { | ||
| placeable.placeRelative(0, 0) | ||
| } | ||
| } | ||
| } | ||
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| private operator fun Size.times(scale: ScaleFactor): IntSize { | ||
| return IntSize((width * scale.scaleX).toInt(), (height * scale.scaleY).toInt()) | ||
| } |
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