256 lines
9.0 KiB
TypeScript
256 lines
9.0 KiB
TypeScript
/*
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Copyright 2020 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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interface IParams {
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// colour parameters
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bgColor: string;
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textColor: string;
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// font styling parameters
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fontFamily: string;
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fontWeight: "normal" | "italic" | "bold" | "bolder" | "lighter" | number;
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// positioning parameters
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isUp: boolean;
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isLeft: boolean;
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}
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const defaults: IParams = {
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bgColor: "#d00",
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textColor: "#fff",
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fontFamily: "sans-serif", // Arial,Verdana,Times New Roman,serif,sans-serif,...
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fontWeight: "bold", // normal,italic,oblique,bold,bolder,lighter,100,200,300,400,500,600,700,800,900
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isUp: false,
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isLeft: false,
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};
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// Allows dynamic rendering of a circular badge atop the loaded favicon
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// supports colour, font and basic positioning parameters.
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// Based upon https://github.com/ejci/favico.js/blob/master/favico.js [MIT license]
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export default class Favicon {
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private readonly browser = {
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ff: typeof window.InstallTrigger !== "undefined",
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opera: !!window.opera || navigator.userAgent.includes("Opera"),
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};
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private readonly params: IParams;
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private readonly canvas: HTMLCanvasElement;
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private readonly baseImage: HTMLImageElement;
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private context: CanvasRenderingContext2D;
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private icons: HTMLLinkElement[];
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private isReady = false;
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// callback to run once isReady is asserted, allows for a badge to be queued for when it can be shown
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private readyCb = () => {};
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constructor(params: Partial<IParams> = {}) {
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this.params = {...defaults, ...params};
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this.icons = Favicon.getIcons();
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// create work canvas
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this.canvas = document.createElement("canvas");
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// create clone of favicon as a base
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this.baseImage = document.createElement("img");
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const lastIcon = this.icons[this.icons.length - 1];
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if (lastIcon.hasAttribute("href")) {
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this.baseImage.setAttribute("crossOrigin", "anonymous");
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this.baseImage.onload = () => {
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// get height and width of the favicon
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this.canvas.height = (this.baseImage.height > 0) ? this.baseImage.height : 32;
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this.canvas.width = (this.baseImage.width > 0) ? this.baseImage.width : 32;
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this.context = this.canvas.getContext("2d");
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this.ready();
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};
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this.baseImage.setAttribute("src", lastIcon.getAttribute("href"));
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} else {
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this.canvas.height = this.baseImage.height = 32;
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this.canvas.width = this.baseImage.width = 32;
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this.context = this.canvas.getContext("2d");
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this.ready();
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}
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}
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private reset() {
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this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
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this.context.drawImage(this.baseImage, 0, 0, this.canvas.width, this.canvas.height);
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}
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private options(n: number | string, params: IParams) {
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const opt = {
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n: ((typeof n) === "number") ? Math.abs(n as number | 0) : n,
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len: ("" + n).length,
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// badge positioning constants as percentages
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x: 0.4,
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y: 0.4,
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w: 0.6,
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h: 0.6,
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};
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// apply positional transformations
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if (params.isUp) {
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if (opt.y < 0.6) {
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opt.y = opt.y - 0.4;
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} else {
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opt.y = opt.y - 2 * opt.y + (1 - opt.w);
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}
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}
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if (params.isLeft) {
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if (opt.x < 0.6) {
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opt.x = opt.x - 0.4;
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} else {
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opt.x = opt.x - 2 * opt.x + (1 - opt.h);
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}
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}
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// scale the position to the canvas
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opt.x = this.canvas.width * opt.x;
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opt.y = this.canvas.height * opt.y;
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opt.w = this.canvas.width * opt.w;
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opt.h = this.canvas.height * opt.h;
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return opt;
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}
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private circle(n: number | string, opts?: Partial<IParams>) {
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const params = {...this.params, ...opts};
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const opt = this.options(n, params);
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let more = false;
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if (opt.len === 2) {
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opt.x = opt.x - opt.w * 0.4;
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opt.w = opt.w * 1.4;
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more = true;
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} else if (opt.len >= 3) {
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opt.x = opt.x - opt.w * 0.65;
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opt.w = opt.w * 1.65;
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more = true;
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}
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this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
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this.context.drawImage(this.baseImage, 0, 0, this.canvas.width, this.canvas.height);
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this.context.beginPath();
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const fontSize = Math.floor(opt.h * (opt.n > 99 ? 0.85 : 1)) + "px";
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this.context.font = `${params.fontWeight} ${fontSize} ${params.fontFamily}`;
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this.context.textAlign = "center";
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if (more) {
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this.context.moveTo(opt.x + opt.w / 2, opt.y);
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this.context.lineTo(opt.x + opt.w - opt.h / 2, opt.y);
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this.context.quadraticCurveTo(opt.x + opt.w, opt.y, opt.x + opt.w, opt.y + opt.h / 2);
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this.context.lineTo(opt.x + opt.w, opt.y + opt.h - opt.h / 2);
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this.context.quadraticCurveTo(opt.x + opt.w, opt.y + opt.h, opt.x + opt.w - opt.h / 2, opt.y + opt.h);
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this.context.lineTo(opt.x + opt.h / 2, opt.y + opt.h);
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this.context.quadraticCurveTo(opt.x, opt.y + opt.h, opt.x, opt.y + opt.h - opt.h / 2);
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this.context.lineTo(opt.x, opt.y + opt.h / 2);
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this.context.quadraticCurveTo(opt.x, opt.y, opt.x + opt.h / 2, opt.y);
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} else {
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this.context.arc(opt.x + opt.w / 2, opt.y + opt.h / 2, opt.h / 2, 0, 2 * Math.PI);
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}
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this.context.fillStyle = params.bgColor;
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this.context.fill();
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this.context.closePath();
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this.context.beginPath();
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this.context.stroke();
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this.context.fillStyle = params.textColor;
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if ((typeof opt.n) === "number" && opt.n > 999) {
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const count = ((opt.n > 9999) ? 9 : Math.floor(opt.n as number / 1000)) + "k+";
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this.context.fillText(count, Math.floor(opt.x + opt.w / 2), Math.floor(opt.y + opt.h - opt.h * 0.2));
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} else {
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this.context.fillText("" + opt.n, Math.floor(opt.x + opt.w / 2), Math.floor(opt.y + opt.h - opt.h * 0.15));
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}
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this.context.closePath();
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}
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private ready() {
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if (this.isReady) return;
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this.isReady = true;
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this.readyCb();
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}
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private setIcon(canvas) {
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setImmediate(() => {
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this.setIconSrc(canvas.toDataURL("image/png"));
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});
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}
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private setIconSrc(url) {
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// if is attached to fav icon
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if (this.browser.ff || this.browser.opera) {
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// for FF we need to "recreate" element, attach to dom and remove old <link>
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const old = this.icons[this.icons.length - 1];
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const newIcon = window.document.createElement("link");
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this.icons = [newIcon];
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newIcon.setAttribute("rel", "icon");
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newIcon.setAttribute("type", "image/png");
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window.document.getElementsByTagName("head")[0].appendChild(newIcon);
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newIcon.setAttribute("href", url);
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if (old.parentNode) {
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old.parentNode.removeChild(old);
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}
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} else {
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this.icons.forEach(icon => {
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icon.setAttribute("href", url);
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});
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}
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}
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public badge(content: number | string, opts?: Partial<IParams>) {
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if (!this.isReady) {
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this.readyCb = () => {
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this.badge(content, opts);
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}
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return;
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}
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if (typeof content === "string" || content > 0) {
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this.circle(content, opts);
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} else {
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this.reset();
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}
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this.setIcon(this.canvas);
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}
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private static getLinks() {
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const icons: HTMLLinkElement[] = [];
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const links = window.document.getElementsByTagName("head")[0].getElementsByTagName("link");
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for (let i = 0; i < links.length; i++) {
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if ((/(^|\s)icon(\s|$)/i).test(links[i].getAttribute("rel"))) {
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icons.push(links[i]);
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}
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}
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return icons;
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}
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private static getIcons() {
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// get favicon link elements
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let elms = Favicon.getLinks();
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if (elms.length === 0) {
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elms = [window.document.createElement("link")];
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elms[0].setAttribute("rel", "icon");
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window.document.getElementsByTagName("head")[0].appendChild(elms[0]);
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}
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elms.forEach(item => {
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item.setAttribute("type", "image/png");
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});
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return elms;
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}
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}
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