commonMain.io.nacular.doodle.layout.TileLayout.kt Maven / Gradle / Ivy

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package io.nacular.doodle.layout

import io.nacular.doodle.core.Layout
import io.nacular.doodle.core.PositionableContainer
import io.nacular.doodle.geometry.Rectangle

/**
 * Created by Nicholas Eddy on 2/22/19.
 */
public class TileLayout(private val spacing: Double = 0.0): Layout {
    override fun layout(container: PositionableContainer) {
        if (container.size.empty || container.children.isEmpty()) {
            return
        }

        var tileLength = container.width - container.insets.run { left + right }
        var tileBottom: Double
        var numCols = 1

        do {
            val numRows = (container.children.size / numCols) + 1
            tileBottom  = container.insets.top + numRows * tileLength + (numRows - 1) * spacing

            if (tileBottom <= container.height - container.insets.bottom) {
                break
            }

            ++numCols
            tileLength = (container.width - container.insets.run { left + right } - (numCols - 1) * spacing) / numCols
        } while (true)

        container.children.forEachIndexed { i, child ->
            child.bounds = Rectangle(container.insets.left + i % numCols * (tileLength + spacing), container.insets.top + i / numCols * (tileLength + spacing), tileLength, tileLength)
        }
    }
}