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Introduce a node layer type (#140)

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This owns measurement, placement, and drawing, and will be stackable in the future.
This commit is contained in:
Jake Wharton
2023-03-07 23:34:05 -05:00
committed by GitHub
parent b616a8d79a
commit 94acb0e12b
1 changed files with 45 additions and 33 deletions
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78
mosaic-runtime/src/commonMain/kotlin/com/jakewharton/mosaic/nodes.kt
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@ -36,59 +36,71 @@ internal fun interface DebugPolicy {
fun MosaicNode.renderDebug(): String fun MosaicNode.renderDebug(): String
} }
internal abstract class MosaicNodeLayer : Placeable(), Measurable {
abstract val x: Int
abstract val y: Int
abstract fun drawTo(canvas: TextCanvas)
}
internal class MosaicNode( internal class MosaicNode(
var measurePolicy: MeasurePolicy, var measurePolicy: MeasurePolicy,
var drawPolicy: DrawPolicy?, var drawPolicy: DrawPolicy?,
var staticDrawPolicy: StaticDrawPolicy, var staticDrawPolicy: StaticDrawPolicy,
var debugPolicy: DebugPolicy, var debugPolicy: DebugPolicy,
) : Placeable(), Measurable { ) : Measurable {
val children = mutableListOf<MosaicNode>() val children = mutableListOf<MosaicNode>()
private var measureResult: MeasureResult = NotMeasured
override val width get() = measureResult.width private val layer: MosaicNodeLayer = object : MosaicNodeLayer() {
override val height get() = measureResult.height private var measureResult: MeasureResult = NotMeasured
/** Measure this node (and any children) and update [width] and [height]. */ override val width get() = measureResult.width
override fun measure(): Placeable = apply { override val height get() = measureResult.height
measureResult = measurePolicy.run { MeasureScope.run { measure(children) } }
}
// These two values are set by a call to `placeAt`. override fun measure() = apply {
/** Pixels right relative to parent at which this node will draw. */ measureResult = measurePolicy.run { MeasureScope.run { measure(children) } }
var x = 0 }
private set
/** Pixels down relative to parent at which this node will draw. */
var y = 0
private set
override fun placeAt(x: Int, y: Int) { override var x = 0
this.x = x private set
this.y = y override var y = 0
measureResult.placeChildren() private set
}
private fun drawTo(canvas: TextCanvas) { override fun placeAt(x: Int, y: Int) {
val drawPolicy = drawPolicy this.x = x
if (drawPolicy != null) { this.y = y
drawPolicy.performDraw(canvas) measureResult.placeChildren()
} else { }
for (child in children) {
if (child.width != 0 && child.height != 0) { override fun drawTo(canvas: TextCanvas) {
val left = child.x val drawPolicy = drawPolicy
val top = child.y if (drawPolicy != null) {
val right = left + child.width - 1 drawPolicy.performDraw(canvas)
val bottom = top + child.height - 1 } else {
child.drawTo(canvas[top..bottom, left..right]) 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 measure(): Placeable = layer.measure()
val width: Int get() = layer.width
val height: Int get() = layer.height
val x: Int get() = layer.x
val y: Int get() = layer.y
fun draw(): TextCanvas { fun draw(): TextCanvas {
val placeable = measure() val placeable = measure()
placeable.place(0, 0) placeable.place(0, 0)
val surface = TextSurface(placeable.width, placeable.height) val surface = TextSurface(placeable.width, placeable.height)
drawTo(surface) layer.drawTo(surface)
return surface return surface
} }