Function boxLayoutItems

boxlayout.go:269–559

boxLayoutItems lays out items. bounds parameter is in native pixels.

(container ContainerLayoutItem, items []LayoutItem, orientation Orientation, alignment Alignment2D, bounds Rectangle, margins96dpi Margins, spacing96dpi int, hwnd2StretchFactor map[win.HWND]int)

// boxLayoutItems lays out items. bounds parameter is in native pixels.
func boxLayoutItems(container ContainerLayoutItem, items []LayoutItem, orientation Orientation, alignment Alignment2D, bounds Rectangle, margins96dpi Margins, spacing96dpi int, hwnd2StretchFactor map[win.HWND]int) []LayoutResultItem {
	if len(items) == 0 {
		return nil
	}

	dpi := container.Context().dpi
	margins := MarginsFrom96DPI(margins96dpi, dpi)
	spacing := IntFrom96DPI(spacing96dpi, dpi)

	var greedyNonSpacerCount int
	var greedySpacerCount int
	var stretchFactorsTotal [3]int
	stretchFactors := make([]int, len(items))
	var minSizesRemaining int
	minSizes := make([]int, len(items))
	maxSizes := make([]int, len(items))
	sizes := make([]int, len(items))
	prefSizes2 := make([]int, len(items))
	var shrinkableAmount1Total int
	shrinkableAmount1 := make([]int, len(items))
	shrinkable2 := make([]bool, len(items))
	growable2 := make([]bool, len(items))
	sortedItemInfo := boxLayoutItemInfoList(make([]boxLayoutItemInfo, len(items)))

	for i, item := range items {
		sf := hwnd2StretchFactor[item.Handle()]
		if sf == 0 {
			sf = 1
		}
		stretchFactors[i] = sf

		geometry := item.Geometry()

		flags := item.LayoutFlags()

		max := geometry.MaxSize
		var pref Size
		if hfw, ok := item.(HeightForWidther); !ok || !hfw.HasHeightForWidth() {
			if is, ok := item.(IdealSizer); ok {
				pref = is.IdealSize()
			}
		}

		if orientation == Horizontal {
			growable2[i] = flags&GrowableVert > 0

			minSizes[i] = container.MinSizeEffectiveForChild(item).Width

			if max.Width > 0 {
				maxSizes[i] = max.Width
			} else if pref.Width > 0 && flags&GrowableHorz == 0 {
				maxSizes[i] = pref.Width
			} else {
				maxSizes[i] = 32768
			}

			prefSizes2[i] = pref.Height