kotlin/mosaic
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Put nodes in charge of rendering themselves

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Jake Wharton
2020-10-11 23:18:24 -04:00
parent c5dff2a559
commit fa53cbe1f0
2 changed files with 21 additions and 21 deletions
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21
mosaic/src/main/kotlin/com/jakewharton/mosaic/nodes.kt
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@ -4,10 +4,13 @@ import androidx.compose.runtime.AbstractApplier
import com.facebook.yoga.YogaMeasureOutput import com.facebook.yoga.YogaMeasureOutput
import com.facebook.yoga.YogaNode import com.facebook.yoga.YogaNode
import com.facebook.yoga.YogaNodeFactory import com.facebook.yoga.YogaNodeFactory
import com.jakewharton.crossword.TextCanvas
import com.jakewharton.crossword.visualCodePointCount import com.jakewharton.crossword.visualCodePointCount
internal sealed class MosaicNode { internal sealed class MosaicNode {
val yoga: YogaNode = YogaNodeFactory.create() val yoga: YogaNode = YogaNodeFactory.create()
abstract fun render(canvas: TextCanvas)
} }
internal class TextNode(initialValue: String = "") : MosaicNode() { internal class TextNode(initialValue: String = "") : MosaicNode() {
@ -26,12 +29,30 @@ internal class TextNode(initialValue: String = "") : MosaicNode() {
yoga.dirty() yoga.dirty()
} }
override fun render(canvas: TextCanvas) {
value.split('\n').forEachIndexed { index, line ->
canvas.write(index, 0, line)
}
}
override fun toString() = "Text($value)" override fun toString() = "Text($value)"
} }
internal class BoxNode : MosaicNode() { internal class BoxNode : MosaicNode() {
val children = mutableListOf<MosaicNode>() val children = mutableListOf<MosaicNode>()
override fun render(canvas: TextCanvas) {
for (child in children) {
val childYoga = child.yoga
val left = childYoga.layoutX.toInt()
val top = childYoga.layoutY.toInt()
val right = left + childYoga.layoutWidth.toInt()
val bottom = top + childYoga.layoutHeight.toInt()
val clipped = canvas.clip(left, top, right, bottom)
child.render(clipped)
}
}
override fun toString() = children.joinToString(prefix = "Box(", postfix = ")") override fun toString() = children.joinToString(prefix = "Box(", postfix = ")")
} }

21
mosaic/src/main/kotlin/com/jakewharton/mosaic/render.kt
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@ -7,24 +7,3 @@ internal fun MosaicNode.renderToString(): String {
render(surface) render(surface)
return surface.toString() return surface.toString()
} }
private fun MosaicNode.render(canvas: TextCanvas) {
when (this) {
is TextNode -> {
value.split('\n').forEachIndexed { index, line ->
canvas.write(index, 0, line)
}
}
is BoxNode -> {
for (child in children) {
val childYoga = child.yoga
val left = childYoga.layoutX.toInt()
val top = childYoga.layoutY.toInt()
val right = left + childYoga.layoutWidth.toInt()
val bottom = top + childYoga.layoutHeight.toInt()
val clipped = canvas.clip(left, top, right, bottom)
child.render(clipped)
}
}
}
}