ionicons
Version:
Premium icons for Ionic.
274 lines (273 loc) • 8.39 kB
JavaScript
export class Icon {
constructor() {
this.isVisible = false;
}
componentWillLoad() {
// purposely do not return the promise here because loading
// the svg file should not hold up loading the app
// only load the svg if it's visible
this.waitUntilVisible(this.el, '50px', () => {
this.isVisible = true;
this.loadIcon();
});
}
componentDidUnload() {
if (this.io) {
this.io.disconnect();
this.io = undefined;
}
}
waitUntilVisible(el, rootMargin, cb) {
if (this.win && this.win.IntersectionObserver) {
const io = this.io = new this.win.IntersectionObserver((data) => {
if (data[0].isIntersecting) {
io.disconnect();
this.io = undefined;
cb();
}
}, { rootMargin });
io.observe(el);
}
else {
// browser doesn't support IntersectionObserver
// so just fallback to always show it
cb();
}
}
loadIcon() {
if (!this.isServer && this.isVisible) {
const url = this.getUrl();
if (url) {
getSvgContent(url).then(svgContent => {
this.svgContent = validateContent(this.doc, svgContent, this.el['s-sc']);
});
}
}
if (!this.ariaLabel) {
const name = getName(this.name, this.mode, this.ios, this.md);
// user did not provide a label
// come up with the label based on the icon name
if (name) {
this.ariaLabel = name
.replace('ios-', '')
.replace('md-', '')
.replace(/\-/g, ' ');
}
}
}
getUrl() {
let url = getSrc(this.src);
if (url) {
return url;
}
url = getName(this.name, this.mode, this.ios, this.md);
if (url) {
return this.getNamedUrl(url);
}
url = getSrc(this.icon);
if (url) {
return url;
}
url = getName(this.icon, this.mode, this.ios, this.md);
if (url) {
return this.getNamedUrl(url);
}
return null;
}
getNamedUrl(name) {
return `${this.resourcesUrl}svg/${name}.svg`;
}
hostData() {
return {
'role': 'img',
class: Object.assign({}, createColorClasses(this.color), { [`icon-${this.size}`]: !!this.size })
};
}
render() {
if (!this.isServer && this.svgContent) {
// we've already loaded up this svg at one point
// and the svg content we've loaded and assigned checks out
// render this svg!!
return h("div", { class: "icon-inner", innerHTML: this.svgContent });
}
// actively requesting the svg
// or it's an SSR render
// so let's just render an empty div for now
return h("div", { class: "icon-inner" });
}
static get is() { return "ion-icon"; }
static get encapsulation() { return "shadow"; }
static get properties() { return {
"ariaLabel": {
"type": String,
"attr": "aria-label",
"reflectToAttr": true,
"mutable": true
},
"color": {
"type": String,
"attr": "color"
},
"doc": {
"context": "document"
},
"el": {
"elementRef": true
},
"icon": {
"type": String,
"attr": "icon",
"watchCallbacks": ["loadIcon"]
},
"ios": {
"type": String,
"attr": "ios"
},
"isServer": {
"context": "isServer"
},
"isVisible": {
"state": true
},
"md": {
"type": String,
"attr": "md"
},
"mode": {
"type": String,
"attr": "mode"
},
"name": {
"type": String,
"attr": "name",
"watchCallbacks": ["loadIcon"]
},
"resourcesUrl": {
"context": "resourcesUrl"
},
"size": {
"type": String,
"attr": "size"
},
"src": {
"type": String,
"attr": "src",
"watchCallbacks": ["loadIcon"]
},
"svgContent": {
"state": true
},
"win": {
"context": "window"
}
}; }
static get style() { return "/**style-placeholder:ion-icon:**/"; }
}
const requests = new Map();
function getSvgContent(url) {
// see if we already have a request for this url
let req = requests.get(url);
if (!req) {
// we don't already have a request
req = fetch(url, { cache: 'force-cache' }).then(rsp => {
if (rsp.ok) {
return rsp.text();
}
return Promise.resolve(null);
});
// cache for the same requests
requests.set(url, req);
}
return req;
}
export function getName(name, mode, ios, md) {
// default to "md" if somehow the mode wasn't set
mode = (mode || 'md').toLowerCase();
// if an icon was passed in using the ios or md attributes
// set the iconName to whatever was passed in
if (ios && mode === 'ios') {
name = ios.toLowerCase();
}
else if (md && mode === 'md') {
name = md.toLowerCase();
}
else if (name) {
name = name.toLowerCase();
if (!/^md-|^ios-|^logo-/.test(name)) {
// this does not have one of the defaults
// so lets auto add in the mode prefix for them
name = `${mode}-${name}`;
}
}
if (typeof name !== 'string' || name.trim() === '') {
return null;
}
// only allow alpha characters and dash
const invalidChars = name.replace(/[a-z]|-|\d/gi, '');
if (invalidChars !== '') {
return null;
}
return name;
}
export function getSrc(src) {
if (typeof src === 'string') {
src = src.trim();
if (src.length > 0 && /(\/|\.)/.test(src)) {
return src;
}
}
return null;
}
function validateContent(document, svgContent, scopeId) {
if (svgContent) {
const frag = document.createDocumentFragment();
const div = document.createElement('div');
div.innerHTML = svgContent;
frag.appendChild(div);
// setup this way to ensure it works on our buddy IE
for (let i = div.childNodes.length - 1; i >= 0; i--) {
if (div.childNodes[i].nodeName.toLowerCase() !== 'svg') {
div.removeChild(div.childNodes[i]);
}
}
// must only have 1 root element
const svgElm = div.firstElementChild;
if (svgElm && svgElm.nodeName.toLowerCase() === 'svg') {
if (scopeId) {
svgElm.setAttribute(scopeId, '');
}
// root element must be an svg
// lets double check we've got valid elements
// do not allow scripts
if (isValid(svgElm)) {
return div.innerHTML;
}
}
}
return '';
}
export function isValid(elm) {
if (elm.nodeType === 1) {
if (elm.nodeName.toLowerCase() === 'script') {
return false;
}
for (var i = 0; i < elm.attributes.length; i++) {
let val = elm.attributes[i].value;
if (typeof val === 'string' && val.toLowerCase().indexOf('on') === 0) {
return false;
}
}
for (i = 0; i < elm.childNodes.length; i++) {
if (!isValid(elm.childNodes[i])) {
return false;
}
}
}
return true;
}
function createColorClasses(color) {
return (color) ? {
'ion-color': true,
[`ion-color-${color}`]: true
} : null;
}