mirror of https://github.com/espruino/BangleApps
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42 KiB
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42 KiB
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{"version":3,"file":"qr-scanner.umd.min.js","sources":["src/qr-scanner.js"],"sourcesContent":["export default class QrScanner {\n /* async */\n static hasCamera() {\n return QrScanner.listCameras(false)\n .then(cameras => !!cameras.length)\n .catch(() => false);\n }\n\n /* async */\n static listCameras(requestLabels = false) {\n if (!navigator.mediaDevices) return Promise.resolve([]);\n\n // Note that enumerateDevices can always be called and does not prompt the user for permission.\n // However, enumerateDevices only includes device labels if served via https and an active media stream exists\n // or permission to access the camera was given. Therefore, ask for camera permission by opening a stream, if\n // labels were requested.\n let openedStream = null;\n return (requestLabels\n ? navigator.mediaDevices.getUserMedia({ audio: false, video: true })\n .then(stream => openedStream = stream)\n // Fail gracefully, especially if the device has no camera or on mobile when the camera is already in\n // use and some browsers disallow a second stream.\n .catch(() => {})\n : Promise.resolve()\n )\n .then(() => navigator.mediaDevices.enumerateDevices())\n .then(devices => devices.filter(device => device.kind === 'videoinput').map((device, i) => ({\n id: device.deviceId,\n label: device.label || (i === 0 ? 'Default Camera' : `Camera ${i + 1}`),\n })))\n .finally(() => {\n // close the stream we just opened for getting camera access for listing the device labels\n if (!openedStream) return;\n for (const track of openedStream.getTracks()) {\n track.stop();\n openedStream.removeTrack(track);\n }\n });\n }\n\n constructor(\n video,\n onDecode,\n canvasSizeOrOnDecodeError = this._onDecodeError,\n canvasSizeOrCalculateScanRegion = this._calculateScanRegion,\n preferredCamera = 'environment'\n ) {\n this.$video = video;\n this.$canvas = document.createElement('canvas');\n this._onDecode = onDecode;\n this._legacyCanvasSize = QrScanner.DEFAULT_CANVAS_SIZE;\n this._preferredCamera = preferredCamera;\n this._active = false;\n this._paused = false;\n this._flashOn = false;\n\n if (typeof canvasSizeOrOnDecodeError === 'number') {\n // legacy function signature where the third argument is the canvas size\n this._legacyCanvasSize = canvasSizeOrOnDecodeError;\n console.warn('You\\'re using a deprecated version of the QrScanner constructor which will be removed in '\n + 'the future');\n } else {\n this._onDecodeError = canvasSizeOrOnDecodeError;\n }\n\n if (typeof canvasSizeOrCalculateScanRegion === 'number') {\n // legacy function signature where the fourth argument is the canvas size\n this._legacyCanvasSize = canvasSizeOrCalculateScanRegion;\n console.warn('You\\'re using a deprecated version of the QrScanner constructor which will be removed in '\n + 'the future');\n } else {\n this._calculateScanRegion = canvasSizeOrCalculateScanRegion;\n }\n\n this._scanRegion = this._calculateScanRegion(video);\n\n this._onPlay = this._onPlay.bind(this);\n this._onLoadedMetaData = this._onLoadedMetaData.bind(this);\n this._onVisibilityChange = this._onVisibilityChange.bind(this);\n\n video.disablePictureInPicture = true;\n // Allow inline playback on iPhone instead of requiring full screen playback,\n // see https://webkit.org/blog/6784/new-video-policies-for-ios/\n video.playsInline = true;\n // Allow play() on iPhone without requiring a user gesture. Should not really be needed
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