// Wrap returns a wrapper func that handles the conversion from native JavaScript *js.Object parameters
// to the following types.
//
// It supports *js.Object (left unmodified), dom.Document, dom.Element, dom.Event, dom.HTMLElement, dom.Node.
//
// For other types, the input is assumed to be a JSON string which is then unmarshalled into that type.
func Wrap(fn interface{}) func(...*js.Object) {
v := reflect.ValueOf(fn)
return func(args ...*js.Object) {
in := make([]reflect.Value, v.Type().NumIn())
for i := range in {
switch t := v.Type().In(i); t {
// *js.Object is passed through.
case typeOf((**js.Object)(nil)):
in[i] = reflect.ValueOf(args[i])
// dom types are wrapped.
case typeOf((*dom.Document)(nil)):
in[i] = reflect.ValueOf(dom.WrapDocument(args[i]))
case typeOf((*dom.Element)(nil)):
in[i] = reflect.ValueOf(dom.WrapElement(args[i]))
case typeOf((*dom.Event)(nil)):
in[i] = reflect.ValueOf(dom.WrapEvent(args[i]))
case typeOf((*dom.HTMLElement)(nil)):
in[i] = reflect.ValueOf(dom.WrapHTMLElement(args[i]))
case typeOf((*dom.Node)(nil)):
in[i] = reflect.ValueOf(dom.WrapNode(args[i]))
// Unmarshal incoming encoded JSON into the Go type.
default:
p := reflect.New(t)
err := json.Unmarshal([]byte(args[i].String()), p.Interface())
if err != nil {
panic(err)
}
in[i] = reflect.Indirect(p)
}
}
v.Call(in)
}
}
// NewSVGPathEaser returns a new instance of the SVGPathEaser.
func NewSVGPathEaser(conf SVGConfig) *SVGPathEaser {
var svg SVGPathEaser
svg.conf = conf
svg.svgElement = dom.WrapElement(Document().Underlying().Call("createElementNS", "http://www.w3.org/2000/svg", "path"))
svg.svgElement.SetAttribute("d", conf.SVGPath)
svg.pathlength = svg.svgElement.Underlying().Call("getTotalLength", nil).Int()
svg.generateSampling()
return &svg
}
// Position returns the current position of the dom.Element.
func Position(elem dom.Element) (float64, float64) {
parent := OffsetParent(elem)
var parentTop, parentLeft float64
var marginTop, marginLeft float64
var pBorderTop, pBorderLeft float64
var pBorderTopObject *js.Object
var pBorderLeftObject *js.Object
nodeNameObject, err := GetProp(parent, "nodeName")
if err == nil && !rootName.MatchString(strings.ToLower(nodeNameObject.String())) {
parentElem := dom.WrapElement(parent)
parentTop, parentLeft = Offset(parentElem)
}
if parent.Get("style") != nil {
pBorderTopObject, err = GetProp(parent, "style.borderTopWidth")
if err == nil {
pBorderTop = ParseFloat(pBorderTopObject.String())
}
pBorderLeftObject, err = GetProp(parent, "style.borderLeftWidth")
if err == nil {
pBorderLeft = ParseFloat(pBorderLeftObject.String())
}
parentTop += pBorderTop
parentLeft += pBorderLeft
}
css, _ := GetComputedStyle(elem, "")
marginTopObject, err := GetComputedStyleValueWith(css, "margin-top")
if err == nil {
marginTop = ParseFloat(marginTopObject.String())
}
marginLeftObject, err := GetComputedStyleValueWith(css, "margin-left")
if err == nil {
marginLeft = ParseFloat(marginLeftObject.String())
}
elemTop, elemLeft := Offset(elem)
elemTop -= marginTop
elemLeft -= marginLeft
return elemTop - parentTop, elemLeft - parentLeft
}
// CreateElement is a shortcut to create an element with the given name
func CreateElement(name string) dom.Element {
return dom.WrapElement(js.Global.Get("document").Call("createElement", name))
}