HTMLImageElement-impl.js
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"use strict";
const conversions = require("webidl-conversions");
const HTMLElementImpl = require("./HTMLElement-impl").implementation;
const { Canvas, reflectURLAttribute } = require("../../utils");
class HTMLImageElementImpl extends HTMLElementImpl {
_attrModified(name, value, oldVal) {
// TODO: handle crossorigin
if (name === "src" || ((name === "srcset" || name === "width" || name === "sizes") && value !== oldVal)) {
this._updateTheImageData();
}
super._attrModified(name, value, oldVal);
}
get _accept() {
return "image/png,image/*;q=0.8,*/*;q=0.5";
}
get src() {
return reflectURLAttribute(this, "src");
}
set src(value) {
this.setAttributeNS(null, "src", value);
}
get srcset() {
return conversions.USVString(this.getAttributeNS(null, "srcset"));
}
set srcset(value) {
this.setAttributeNS(null, "srcset", value);
}
get height() {
// Just like on browsers, if no width / height is defined, we fall back on the
// dimensions of the internal image data.
return this.hasAttributeNS(null, "height") ?
conversions["unsigned long"](this.getAttributeNS(null, "height")) :
this.naturalHeight;
}
set height(V) {
this.setAttributeNS(null, "height", String(V));
}
get width() {
return this.hasAttributeNS(null, "width") ?
conversions["unsigned long"](this.getAttributeNS(null, "width")) :
this.naturalWidth;
}
set width(V) {
this.setAttributeNS(null, "width", String(V));
}
get naturalHeight() {
return this._image ? this._image.naturalHeight : 0;
}
get naturalWidth() {
return this._image ? this._image.naturalWidth : 0;
}
get complete() {
return Boolean(this._image && this._image.complete);
}
get currentSrc() {
return this._currentSrc || "";
}
get lowsrc() {
return reflectURLAttribute(this, "lowsrc");
}
set lowsrc(value) {
this.setAttributeNS(null, "lowsrc", value);
}
get longDesc() {
return reflectURLAttribute(this, "longdesc");
}
set longDesc(value) {
this.setAttributeNS(null, "longdesc", value);
}
_updateTheImageData() {
const document = this._ownerDocument;
if (!document._defaultView) {
return;
}
if (!Canvas) {
return;
}
let error;
if (!this._image) {
this._image = new Canvas.Image();
// Install an error handler that just remembers the error. It is then
// thrown in the callback of resourceLoader.fetch() below.
this._image.onerror = function (err) {
error = err;
};
}
this._currentSrc = null;
const srcAttributeValue = this.getAttributeNS(null, "src");
if (srcAttributeValue !== null && srcAttributeValue !== "") {
const resourceLoader = document._resourceLoader;
let request;
const onLoadImage = data => {
const { response } = request;
if (response && response.statusCode !== undefined && response.statusCode !== 200) {
throw new Error("Status code: " + response.statusCode);
}
error = null;
this._image.src = data;
if (error) {
throw new Error(error);
}
this._currentSrc = srcAttributeValue;
};
request = resourceLoader.fetch(this.src, {
element: this,
onLoad: onLoadImage
});
} else {
this._image.src = "";
}
}
}
module.exports = {
implementation: HTMLImageElementImpl
};