html-to-image
Version:
Generates an image from a DOM node using HTML5 canvas and SVG.
289 lines • 13.9 kB
JavaScript
"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (g && (g = 0, op[0] && (_ = 0)), _) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.cloneNode = void 0;
var clone_pseudos_1 = require("./clone-pseudos");
var util_1 = require("./util");
var mimes_1 = require("./mimes");
var dataurl_1 = require("./dataurl");
function cloneCanvasElement(canvas) {
return __awaiter(this, void 0, void 0, function () {
var dataURL;
return __generator(this, function (_a) {
dataURL = canvas.toDataURL();
if (dataURL === 'data:,') {
return [2 /*return*/, canvas.cloneNode(false)];
}
return [2 /*return*/, (0, util_1.createImage)(dataURL)];
});
});
}
function cloneVideoElement(video, options) {
return __awaiter(this, void 0, void 0, function () {
var canvas, ctx, dataURL_1, poster, contentType, dataURL;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (video.currentSrc) {
canvas = document.createElement('canvas');
ctx = canvas.getContext('2d');
canvas.width = video.clientWidth;
canvas.height = video.clientHeight;
ctx === null || ctx === void 0 ? void 0 : ctx.drawImage(video, 0, 0, canvas.width, canvas.height);
dataURL_1 = canvas.toDataURL();
return [2 /*return*/, (0, util_1.createImage)(dataURL_1)];
}
poster = video.poster;
contentType = (0, mimes_1.getMimeType)(poster);
return [4 /*yield*/, (0, dataurl_1.resourceToDataURL)(poster, contentType, options)];
case 1:
dataURL = _a.sent();
return [2 /*return*/, (0, util_1.createImage)(dataURL)];
}
});
});
}
function cloneIFrameElement(iframe, options) {
var _a;
return __awaiter(this, void 0, void 0, function () {
var _b;
return __generator(this, function (_c) {
switch (_c.label) {
case 0:
_c.trys.push([0, 3, , 4]);
if (!((_a = iframe === null || iframe === void 0 ? void 0 : iframe.contentDocument) === null || _a === void 0 ? void 0 : _a.body)) return [3 /*break*/, 2];
return [4 /*yield*/, cloneNode(iframe.contentDocument.body, options, true)];
case 1: return [2 /*return*/, (_c.sent())];
case 2: return [3 /*break*/, 4];
case 3:
_b = _c.sent();
return [3 /*break*/, 4];
case 4: return [2 /*return*/, iframe.cloneNode(false)];
}
});
});
}
function cloneSingleNode(node, options) {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
if ((0, util_1.isInstanceOfElement)(node, HTMLCanvasElement)) {
return [2 /*return*/, cloneCanvasElement(node)];
}
if ((0, util_1.isInstanceOfElement)(node, HTMLVideoElement)) {
return [2 /*return*/, cloneVideoElement(node, options)];
}
if ((0, util_1.isInstanceOfElement)(node, HTMLIFrameElement)) {
return [2 /*return*/, cloneIFrameElement(node, options)];
}
return [2 /*return*/, node.cloneNode(isSVGElement(node))];
});
});
}
var isSlotElement = function (node) {
return node.tagName != null && node.tagName.toUpperCase() === 'SLOT';
};
var isSVGElement = function (node) {
return node.tagName != null && node.tagName.toUpperCase() === 'SVG';
};
function cloneChildren(nativeNode, clonedNode, options) {
var _a, _b;
return __awaiter(this, void 0, void 0, function () {
var children;
return __generator(this, function (_c) {
switch (_c.label) {
case 0:
if (isSVGElement(clonedNode)) {
return [2 /*return*/, clonedNode];
}
children = [];
if (isSlotElement(nativeNode) && nativeNode.assignedNodes) {
children = (0, util_1.toArray)(nativeNode.assignedNodes());
}
else if ((0, util_1.isInstanceOfElement)(nativeNode, HTMLIFrameElement) &&
((_a = nativeNode.contentDocument) === null || _a === void 0 ? void 0 : _a.body)) {
children = (0, util_1.toArray)(nativeNode.contentDocument.body.childNodes);
}
else {
children = (0, util_1.toArray)(((_b = nativeNode.shadowRoot) !== null && _b !== void 0 ? _b : nativeNode).childNodes);
}
if (children.length === 0 ||
(0, util_1.isInstanceOfElement)(nativeNode, HTMLVideoElement)) {
return [2 /*return*/, clonedNode];
}
return [4 /*yield*/, children.reduce(function (deferred, child) {
return deferred
.then(function () { return cloneNode(child, options); })
.then(function (clonedChild) {
if (clonedChild) {
clonedNode.appendChild(clonedChild);
}
});
}, Promise.resolve())];
case 1:
_c.sent();
return [2 /*return*/, clonedNode];
}
});
});
}
function cloneCSSStyle(nativeNode, clonedNode, options) {
var targetStyle = clonedNode.style;
if (!targetStyle) {
return;
}
var sourceStyle = window.getComputedStyle(nativeNode);
if (sourceStyle.cssText) {
targetStyle.cssText = sourceStyle.cssText;
targetStyle.transformOrigin = sourceStyle.transformOrigin;
}
else {
(0, util_1.getStyleProperties)(options).forEach(function (name) {
var value = sourceStyle.getPropertyValue(name);
if (name === 'font-size' && value.endsWith('px')) {
var reducedFont = Math.floor(parseFloat(value.substring(0, value.length - 2))) - 0.1;
value = "".concat(reducedFont, "px");
}
if ((0, util_1.isInstanceOfElement)(nativeNode, HTMLIFrameElement) &&
name === 'display' &&
value === 'inline') {
value = 'block';
}
if (name === 'd' && clonedNode.getAttribute('d')) {
value = "path(".concat(clonedNode.getAttribute('d'), ")");
}
targetStyle.setProperty(name, value, sourceStyle.getPropertyPriority(name));
});
}
}
function cloneInputValue(nativeNode, clonedNode) {
if ((0, util_1.isInstanceOfElement)(nativeNode, HTMLTextAreaElement)) {
clonedNode.innerHTML = nativeNode.value;
}
if ((0, util_1.isInstanceOfElement)(nativeNode, HTMLInputElement)) {
clonedNode.setAttribute('value', nativeNode.value);
}
}
function cloneSelectValue(nativeNode, clonedNode) {
if ((0, util_1.isInstanceOfElement)(nativeNode, HTMLSelectElement)) {
var clonedSelect = clonedNode;
var selectedOption = Array.from(clonedSelect.children).find(function (child) { return nativeNode.value === child.getAttribute('value'); });
if (selectedOption) {
selectedOption.setAttribute('selected', '');
}
}
}
function decorate(nativeNode, clonedNode, options) {
if ((0, util_1.isInstanceOfElement)(clonedNode, Element)) {
cloneCSSStyle(nativeNode, clonedNode, options);
(0, clone_pseudos_1.clonePseudoElements)(nativeNode, clonedNode, options);
cloneInputValue(nativeNode, clonedNode);
cloneSelectValue(nativeNode, clonedNode);
}
return clonedNode;
}
function ensureSVGSymbols(clone, options) {
return __awaiter(this, void 0, void 0, function () {
var uses, processedDefs, i, use, id, exist, definition, _a, _b, nodes, ns, svg, defs, i;
return __generator(this, function (_c) {
switch (_c.label) {
case 0:
uses = clone.querySelectorAll ? clone.querySelectorAll('use') : [];
if (uses.length === 0) {
return [2 /*return*/, clone];
}
processedDefs = {};
i = 0;
_c.label = 1;
case 1:
if (!(i < uses.length)) return [3 /*break*/, 4];
use = uses[i];
id = use.getAttribute('xlink:href');
if (!id) return [3 /*break*/, 3];
exist = clone.querySelector(id);
definition = document.querySelector(id);
if (!(!exist && definition && !processedDefs[id])) return [3 /*break*/, 3];
// eslint-disable-next-line no-await-in-loop
_a = processedDefs;
_b = id;
return [4 /*yield*/, cloneNode(definition, options, true)];
case 2:
// eslint-disable-next-line no-await-in-loop
_a[_b] = (_c.sent());
_c.label = 3;
case 3:
i++;
return [3 /*break*/, 1];
case 4:
nodes = Object.values(processedDefs);
if (nodes.length) {
ns = 'http://www.w3.org/1999/xhtml';
svg = document.createElementNS(ns, 'svg');
svg.setAttribute('xmlns', ns);
svg.style.position = 'absolute';
svg.style.width = '0';
svg.style.height = '0';
svg.style.overflow = 'hidden';
svg.style.display = 'none';
defs = document.createElementNS(ns, 'defs');
svg.appendChild(defs);
for (i = 0; i < nodes.length; i++) {
defs.appendChild(nodes[i]);
}
clone.appendChild(svg);
}
return [2 /*return*/, clone];
}
});
});
}
function cloneNode(node, options, isRoot) {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
if (!isRoot && options.filter && !options.filter(node)) {
return [2 /*return*/, null];
}
return [2 /*return*/, Promise.resolve(node)
.then(function (clonedNode) { return cloneSingleNode(clonedNode, options); })
.then(function (clonedNode) { return cloneChildren(node, clonedNode, options); })
.then(function (clonedNode) { return decorate(node, clonedNode, options); })
.then(function (clonedNode) { return ensureSVGSymbols(clonedNode, options); })];
});
});
}
exports.cloneNode = cloneNode;
//# sourceMappingURL=clone-node.js.map