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lottie-compose/src/main/java/com/airbnb/lottie/compose/LottieAnimationSizeNode.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| package com.airbnb.lottie.compose | ||
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| import androidx.compose.runtime.Stable | ||
| import androidx.compose.ui.Modifier | ||
| import androidx.compose.ui.layout.Measurable | ||
| import androidx.compose.ui.layout.MeasureResult | ||
| import androidx.compose.ui.layout.MeasureScope | ||
| import androidx.compose.ui.node.LayoutModifierNode | ||
| import androidx.compose.ui.node.ModifierNodeElement | ||
| import androidx.compose.ui.unit.Constraints | ||
| import androidx.compose.ui.unit.IntSize | ||
| import androidx.compose.ui.unit.constrain | ||
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| @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 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 { | ||
| // There is enough space for the width and height so we don't need to constrain. | ||
| constrainedSize.width >= width && constrainedSize.height >= height -> Constraints( | ||
| minWidth = width, | ||
| maxWidth = width, | ||
| minHeight = height, | ||
| maxHeight = height, | ||
| ) | ||
| // There is enough space in the width but not height so we need to constrain the height. | ||
| constrainedSize.width >= width -> Constraints( | ||
| minWidth = constrainedSize.height * width / height, | ||
| maxWidth = constrainedSize.height * width / height, | ||
| minHeight = constrainedSize.height, | ||
| maxHeight = constrainedSize.height, | ||
| ) | ||
| // There is enough space in the height but not width so we need to constrain the width. | ||
| constrainedSize.height >= height -> Constraints( | ||
| minWidth = constrainedSize.width, | ||
| maxWidth = constrainedSize.width, | ||
| minHeight = constrainedSize.width * height / width, | ||
| maxHeight = constrainedSize.width * height / width, | ||
| ) | ||
| else -> { | ||
| val constraintAspectRation = constrainedSize.height / constrainedSize.width.toFloat() | ||
| val aspectRatio = height / width.toFloat() | ||
| if (constraintAspectRation >= aspectRatio) { | ||
| Constraints( | ||
| minWidth = constrainedSize.width, | ||
| maxWidth = constrainedSize.width, | ||
| minHeight = constrainedSize.width * height / width, | ||
| maxHeight = constrainedSize.width * height / width, | ||
| ) | ||
| } else { | ||
| Constraints( | ||
| minWidth = constrainedSize.height * width / height, | ||
| maxWidth = constrainedSize.height * width / height, | ||
| 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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