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Add a second layer if draw policy is non-null

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Jake Wharton 2023-03-10 22:27:10 -05:00 committed by Jake Wharton
parent 080877df99
commit 9a2e7ba967
1 changed files with 49 additions and 26 deletions
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75
mosaic-runtime/src/commonMain/kotlin/com/jakewharton/mosaic/nodes.kt
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@ -40,23 +40,28 @@ internal fun interface DebugPolicy {
fun MosaicNode.renderDebug(): String
}
internal abstract class MosaicNodeLayer : Placeable(), Measurable {
internal abstract class MosaicNodeLayer : Placeable() {
abstract fun measure(): MeasureResult
abstract val x: Int
abstract val y: Int
abstract fun drawTo(canvas: TextCanvas)
}
internal abstract class AbstractMosaicNodeLayer : MosaicNodeLayer() {
internal abstract class AbstractMosaicNodeLayer(
private val next: MosaicNodeLayer?,
) : MosaicNodeLayer() {
private var measureResult: MeasureResult = NotMeasured
final override val width get() = measureResult.width
final override val height get() = measureResult.height
final override fun measure() = apply {
measureResult = doMeasure()
final override fun measure(): MeasureResult {
return doMeasure().also { measureResult = it }
}
abstract fun doMeasure(): MeasureResult
open fun doMeasure(): MeasureResult {
return checkNotNull(next).measure()
}
final override var x = 0
private set
@ -68,6 +73,13 @@ internal abstract class AbstractMosaicNodeLayer : MosaicNodeLayer() {
this.y = y
measureResult.placeChildren()
}
final override fun drawTo(canvas: TextCanvas) {
drawLayer(canvas)
next?.drawTo(canvas)
}
open fun drawLayer(canvas: TextCanvas) {}
}
internal object NotMeasured : MeasureResult {
@ -79,46 +91,57 @@ internal object NotMeasured : MeasureResult {
internal class MosaicNode(
var measurePolicy: MeasurePolicy,
var staticDrawPolicy: StaticDrawPolicy,
var drawPolicy: DrawPolicy?,
drawPolicy: DrawPolicy?,
var debugPolicy: DebugPolicy,
) : Measurable {
val children = mutableListOf<MosaicNode>()
private val layer: MosaicNodeLayer = object : AbstractMosaicNodeLayer() {
private val bottomLayer: MosaicNodeLayer = object : AbstractMosaicNodeLayer(null) {
override fun doMeasure(): MeasureResult {
return measurePolicy.run { MeasureScope.measure(children) }
}
override fun drawTo(canvas: TextCanvas) {
val drawPolicy = drawPolicy
if (drawPolicy != null) {
drawPolicy.performDraw(canvas)
} else {
for (child in children) {
if (child.width != 0 && child.height != 0) {
val left = child.x
val top = child.y
val right = left + child.width - 1
val bottom = top + child.height - 1
child.layer.drawTo(canvas[top..bottom, left..right])
}
override fun drawLayer(canvas: TextCanvas) {
for (child in children) {
if (child.width != 0 && child.height != 0) {
val left = child.x
val top = child.y
val right = left + child.width - 1
val bottom = top + child.height - 1
child.topLayer.drawTo(canvas[top..bottom, left..right])
}
}
}
}
override fun measure(): Placeable = layer.measure()
private var topLayer = bottomLayer
val width: Int get() = layer.width
val height: Int get() = layer.height
val x: Int get() = layer.x
val y: Int get() = layer.y
var drawPolicy: DrawPolicy? = drawPolicy
set(value) {
topLayer = if (value == null) {
bottomLayer
} else {
object : AbstractMosaicNodeLayer(bottomLayer) {
override fun drawLayer(canvas: TextCanvas) {
value.performDraw(canvas)
}
}
}
field = value
}
override fun measure(): Placeable = topLayer.apply { measure() }
val width: Int get() = topLayer.width
val height: Int get() = topLayer.height
val x: Int get() = topLayer.x
val y: Int get() = topLayer.y
fun draw(): TextCanvas {
val placeable = measure()
placeable.place(0, 0)
val surface = TextSurface(placeable.width, placeable.height)
layer.drawTo(surface)
topLayer.drawTo(surface)
return surface
}