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Diffstat (limited to 'src/webex/chromeBadge.ts')
-rw-r--r-- | src/webex/chromeBadge.ts | 288 |
1 files changed, 0 insertions, 288 deletions
diff --git a/src/webex/chromeBadge.ts b/src/webex/chromeBadge.ts deleted file mode 100644 index 7bc5d368d..000000000 --- a/src/webex/chromeBadge.ts +++ /dev/null @@ -1,288 +0,0 @@ -/* - This file is part of TALER - (C) 2016 INRIA - - TALER is free software; you can redistribute it and/or modify it under the - terms of the GNU General Public License as published by the Free Software - Foundation; either version 3, or (at your option) any later version. - - TALER is distributed in the hope that it will be useful, but WITHOUT ANY - WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR - A PARTICULAR PURPOSE. See the GNU General Public License for more details. - - You should have received a copy of the GNU General Public License along with - TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/> - */ - -import { isFirefox } from "./compat"; - -/** - * Polyfill for requestAnimationFrame, which - * doesn't work from a background page. - */ -function rAF(cb: (ts: number) => void): void { - window.setTimeout(() => { - cb(performance.now()); - }, 100 /* 100 ms delay between frames */); -} - -/** - * Badge for Chrome that renders a Taler logo with a rotating ring if some - * background activity is happening. - */ -export class ChromeBadge { - private canvas: HTMLCanvasElement; - private ctx: CanvasRenderingContext2D; - /** - * True if animation running. The animation - * might still be running even if we're not busy anymore, - * just to transition to the "normal" state in a animated way. - */ - private animationRunning = false; - - /** - * Is the wallet still busy? Note that we do not stop the - * animation immediately when the wallet goes idle, but - * instead slowly close the gap. - */ - private isBusy = false; - - /** - * Current rotation angle, ranges from 0 to rotationAngleMax. - */ - private rotationAngle = 0; - - /** - * While animating, how wide is the current gap in the circle? - * Ranges from 0 to openMax. - */ - private gapWidth = 0; - - /** - * Should we show the notification dot? - */ - private hasNotification = false; - - /** - * Maximum value for our rotationAngle, corresponds to 2 Pi. - */ - static rotationAngleMax = 1000; - - /** - * How fast do we rotate? Given in rotation angle (relative to rotationAngleMax) per millisecond. - */ - static rotationSpeed = 0.5; - - /** - * How fast to we open? Given in rotation angle (relative to rotationAngleMax) per millisecond. - */ - static openSpeed = 0.15; - - /** - * How fast to we close? Given as a multiplication factor per frame update. - */ - static closeSpeed = 0.7; - - /** - * How far do we open? Given relative to rotationAngleMax. - */ - static openMax = 100; - - constructor(window?: Window) { - // Allow injecting another window for testing - const bg = window || chrome.extension.getBackgroundPage(); - if (!bg) { - throw Error("no window available"); - } - this.canvas = bg.document.createElement("canvas"); - // Note: changing the width here means changing the font - // size in draw() as well! - this.canvas.width = 32; - this.canvas.height = 32; - const ctx = this.canvas.getContext("2d"); - if (!ctx) { - throw Error("unable to get canvas context"); - } - this.ctx = ctx; - this.draw(); - } - - /** - * Draw the badge based on the current state. - */ - private draw(): void { - this.ctx.setTransform(1, 0, 0, 1, 0, 0); - this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height); - - this.ctx.translate(this.canvas.width / 2, this.canvas.height / 2); - - this.ctx.beginPath(); - this.ctx.arc(0, 0, this.canvas.width / 2 - 2, 0, 2 * Math.PI); - this.ctx.fillStyle = "white"; - this.ctx.fill(); - - // move into the center, off by 2 for aligning the "T" with the bottom - // of the circle. - this.ctx.translate(0, 2); - - // pick sans-serif font; note: 14px is based on the 32px width above! - this.ctx.font = "bold 24px sans-serif"; - // draw the "T" perfectly centered (x and y) to the current position - this.ctx.textAlign = "center"; - this.ctx.textBaseline = "middle"; - this.ctx.fillStyle = "black"; - this.ctx.fillText("T", 0, 0); - // now move really into the center - this.ctx.translate(0, -2); - // start drawing the (possibly open) circle - this.ctx.beginPath(); - this.ctx.lineWidth = 2.5; - if (this.animationRunning) { - /* Draw circle around the "T" with an opening of this.gapWidth */ - const aMax = ChromeBadge.rotationAngleMax; - const startAngle = (this.rotationAngle / aMax) * Math.PI * 2; - const stopAngle = - ((this.rotationAngle + aMax - this.gapWidth) / aMax) * Math.PI * 2; - this.ctx.arc( - 0, - 0, - this.canvas.width / 2 - 2, - /* radius */ startAngle, - stopAngle, - false, - ); - } else { - /* Draw full circle */ - this.ctx.arc( - 0, - 0, - this.canvas.width / 2 - 2 /* radius */, - 0, - Math.PI * 2, - false, - ); - } - this.ctx.stroke(); - // go back to the origin - this.ctx.translate(-this.canvas.width / 2, -this.canvas.height / 2); - - if (this.hasNotification) { - // We draw a circle with a soft border in the - // lower right corner. - const r = 8; - const cw = this.canvas.width; - const ch = this.canvas.height; - this.ctx.beginPath(); - this.ctx.arc(cw - r, ch - r, r, 0, 2 * Math.PI, false); - const gradient = this.ctx.createRadialGradient( - cw - r, - ch - r, - r, - cw - r, - ch - r, - 5, - ); - gradient.addColorStop(0, "rgba(255, 255, 255, 1)"); - gradient.addColorStop(1, "blue"); - this.ctx.fillStyle = gradient; - this.ctx.fill(); - } - - // Allow running outside the extension for testing - // tslint:disable-next-line:no-string-literal - if (window["chrome"] && window.chrome["browserAction"]) { - try { - const imageData = this.ctx.getImageData( - 0, - 0, - this.canvas.width, - this.canvas.height, - ); - chrome.browserAction.setIcon({ imageData }); - } catch (e) { - // Might fail if browser has over-eager canvas fingerprinting countermeasures. - // There's nothing we can do then ... - } - } - } - - private animate(): void { - if (this.animationRunning) { - return; - } - if (isFirefox()) { - // Firefox does not support badge animations properly - return; - } - this.animationRunning = true; - let start: number | undefined; - const step = (timestamp: number): void => { - if (!this.animationRunning) { - return; - } - if (!start) { - start = timestamp; - } - if (!this.isBusy && 0 === this.gapWidth) { - // stop if we're close enough to origin - this.rotationAngle = 0; - } else { - this.rotationAngle = - (this.rotationAngle + - (timestamp - start) * ChromeBadge.rotationSpeed) % - ChromeBadge.rotationAngleMax; - } - if (this.isBusy) { - if (this.gapWidth < ChromeBadge.openMax) { - this.gapWidth += ChromeBadge.openSpeed * (timestamp - start); - } - if (this.gapWidth > ChromeBadge.openMax) { - this.gapWidth = ChromeBadge.openMax; - } - } else { - if (this.gapWidth > 0) { - this.gapWidth--; - this.gapWidth *= ChromeBadge.closeSpeed; - } - } - - if (this.isBusy || this.gapWidth > 0) { - start = timestamp; - rAF(step); - } else { - this.animationRunning = false; - } - this.draw(); - }; - rAF(step); - } - - /** - * Draw the badge such that it shows the - * user that something happened (balance changed). - */ - showNotification(): void { - this.hasNotification = true; - this.draw(); - } - - /** - * Draw the badge without the notification mark. - */ - clearNotification(): void { - this.hasNotification = false; - this.draw(); - } - - startBusy(): void { - if (this.isBusy) { - return; - } - this.isBusy = true; - this.animate(); - } - - stopBusy(): void { - this.isBusy = false; - } -} |