Function widgetNextSibling

core/widget.go:472–483

widgetNextSibling returns next sibling or nil if none, including Parts, which are considered to come after Children.

(w Widget)

// widgetNextSibling returns next sibling or nil if none,
// including Parts, which are considered to come after Children.
func widgetNextSibling(w Widget) Widget {
	wb := w.AsWidget()
	if wb.Parent == nil {
		return nil
	}
	parent := wb.Parent.(Widget)
	myidx := wb.IndexInParent()
	if myidx >= 0 && myidx < wb.Parent.AsTree().NumChildren()-1 {
		return parent.AsTree().Child(myidx + 1).(Widget)
	}
	return widgetNextSibling(parent)
}

// widgetPrev returns the previous widget in the tree,
// including Parts, which are considered to come after Children.