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index.js
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index.js
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'use strict'
var React = require('react');
var PropTypes = require('prop-types');
var ReactDOM = require('react-dom');
var qr = require('qr.js');
function getBackingStorePixelRatio(ctx) {
return (
ctx.webkitBackingStorePixelRatio ||
ctx.mozBackingStorePixelRatio ||
ctx.msBackingStorePixelRatio ||
ctx.oBackingStorePixelRatio ||
ctx.backingStorePixelRatio ||
1
);
}
var getDOMNode;
if (/^0\.14/.test(React.version)) {
getDOMNode = function(ref) {
return ref;
}
} else {
getDOMNode = function(ref) {
return ReactDOM.findDOMNode(ref);
}
}
class QRCode extends React.Component {
shouldComponentUpdate(nextProps) {
var that = this;
return Object.keys(QRCode.propTypes).some(function(k) {
return that.props[k] !== nextProps[k];
});
}
componentDidMount() {
this.update();
}
componentDidUpdate() {
this.update();
}
utf16to8(str) {
var out, i, len, c;
out = "";
len = str.length;
for (i = 0; i < len; i++) {
c = str.charCodeAt(i);
if ((c >= 0x0001) && (c <= 0x007F)) {
out += str.charAt(i);
} else if (c > 0x07FF) {
out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
} else {
out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
}
}
return out;
}
update() {
var value = this.utf16to8(this.props.value);
var qrcode = qr(value);
var canvas = getDOMNode(this.refs.canvas);
var ctx = canvas.getContext('2d');
var cells = qrcode.modules;
var tileW = this.props.size / cells.length;
var tileH = this.props.size / cells.length;
var scale = (window.devicePixelRatio || 1) / getBackingStorePixelRatio(ctx);
canvas.height = canvas.width = this.props.size * scale;
ctx.scale(scale, scale);
cells.forEach(function(row, rdx) {
row.forEach(function(cell, cdx) {
ctx.fillStyle = cell ? this.props.fgColor : this.props.bgColor;
var w = (Math.ceil((cdx + 1) * tileW) - Math.floor(cdx * tileW));
var h = (Math.ceil((rdx + 1) * tileH) - Math.floor(rdx * tileH));
ctx.fillRect(Math.round(cdx * tileW), Math.round(rdx * tileH), w, h);
}, this);
}, this);
if (this.props.logo) {
var self = this
var size = this.props.size;
var image = document.createElement('img');
image.src = this.props.logo;
image.onload = function() {
var dwidth = self.props.logoWidth || size * 0.2;
var dheight = self.props.logoHeight || image.height / image.width * dwidth;
var dx = (size - dwidth) / 2;
var dy = (size - dheight) / 2;
image.width = dwidth;
image.height = dheight;
ctx.drawImage(image, dx, dy, dwidth, dheight);
}
}
}
render() {
return React.createElement('canvas', {
style: { height: this.props.size, width: this.props.size },
height: this.props.size,
width: this.props.size,
ref: 'canvas'
});
}
}
QRCode.propTypes = {
value: PropTypes.string.isRequired,
size: PropTypes.number,
bgColor: PropTypes.string,
fgColor: PropTypes.string,
logo: PropTypes.string,
logoWidth: PropTypes.number,
logoHeight: PropTypes.number
};
QRCode.defaultProps = {
size: 128,
bgColor: '#FFFFFF',
fgColor: '#000000',
value: 'http://facebook.github.io/react/'
};
module.exports = QRCode;