package system

import "image"

type boxQuerier []anyBox

func (querier boxQuerier) Len () int {
	return len(querier)
}

func (querier boxQuerier) MinimumSize (index int) image.Point {
	if box, ok := querier.box(index); ok {
		return box.minimumSize()
	}
	return image.Point { }
}

func (querier boxQuerier) RecommendedWidth (index int, height int) int {
	if box, ok := querier.box(index); ok {
		if box, ok := box.(anyContentBox); ok {
			return box.recommendedWidth(height)
		}
	}
	return 0
}

func (querier boxQuerier) RecommendedHeight (index int, width int) int {
	if box, ok := querier.box(index); ok {
		if box, ok := box.(anyContentBox); ok {
			return box.recommendedHeight(width)
		}
	}
	return 0
}

func (querier boxQuerier) box (index int) (anyBox, bool) {
	if index < 0 || index >= len(querier) { return nil, false }
	return querier[index], true
}

type boxArranger []anyBox

func (arranger boxArranger) Len () int {
	return boxQuerier(arranger).Len()
}

func (arranger boxArranger) MinimumSize (index int) image.Point {
	return boxQuerier(arranger).MinimumSize(index)
}

func (arranger boxArranger) RecommendedWidth (index int, height int) int {
	return boxQuerier(arranger).RecommendedWidth(index, height)
}

func (arranger boxArranger) RecommendedHeight (index int, width int) int {
	return boxQuerier(arranger).RecommendedHeight(index, width)
}

func (arranger boxArranger) SetBounds (index int, bounds image.Rectangle) {
	if box, ok := boxQuerier(arranger).box(index); ok {
		box.setBounds(bounds)
	}
}