gui/layout/split.go


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package layout

import "fmt"

// SplitFunc represents a way to split a space among a number of elements.
// The length of the returned slice must be equal to the number of elements.
// The sum of all elements of the returned slice must be eqal to the space.
type SplitFunc func(elements int, space int) []int

var _ SplitFunc = EvenSplit

// EvenSplit is a SplitFunc used to split a space (almost) evenly among the elements.
// It is almost evenly because width may not be divisible by elements.
func EvenSplit(elements int, width int) []int {
	if elements <= 0 {
		panic(fmt.Errorf("EvenSplit: elements must be greater than 0"))
	}
	ret := make([]int, elements)
	for elements > 0 {
		v := width / elements
		width -= v
		elements -= 1
		ret[elements] = v
	}
	return ret
}