@logicflow/extension
Version:
LogicFlow Extensions
238 lines (237 loc) • 10.8 kB
JavaScript
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 };
}
};
var __read = (this && this.__read) || function (o, n) {
var m = typeof Symbol === "function" && o[Symbol.iterator];
if (!m) return o;
var i = m.call(o), r, ar = [], e;
try {
while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
}
catch (error) { e = { error: error }; }
finally {
try {
if (r && !r.done && (m = i["return"])) m.call(i);
}
finally { if (e) throw e.error; }
}
return ar;
};
var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {
if (ar || !(i in from)) {
if (!ar) ar = Array.prototype.slice.call(from, 0, i);
ar[i] = from[i];
}
}
return to.concat(ar || Array.prototype.slice.call(from));
};
/**
* 图片缓存, 已请求过的图片直接从缓存中获取
*/
var imageCache = {};
/**
* 当获取图片失败时会返回失败信息，是 text/plain 类型的数据
* @param str - 图片内容
* @returns
*/
export function isTextPlainBase64(str) {
return str.startsWith('data:text/plain');
}
/**
* 将网络图片转为 base64
* @param url - 图片地址
* @returns
*/
export function convertImageToBase64(url) {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
if (imageCache[url]) {
return [2 /*return*/, imageCache[url]];
}
return [2 /*return*/, new Promise(function (resolve, reject) {
try {
fetch(url)
.then(function (response) { return response.blob(); })
.then(function (blob) {
var reader = new FileReader();
reader.onloadend = function () {
resolve((imageCache[url] = reader.result));
};
reader.onerror = reject;
reader.readAsDataURL(blob);
})
.catch(function () {
resolve((imageCache[url] = url));
});
}
catch (error) {
// 如果转换失败，后续大概率仍然会失败，因此直接缓存
return (imageCache[url] = url);
}
})];
});
});
}
/**
* 使用 base64 的图片替换 img 标签的 src 或 image 标签的 href
* @param node - html 节点或 svg 节点
*/
export function updateImageSrcOrHrefWithBase64Image(node, attrName) {
return __awaiter(this, void 0, void 0, function () {
var url, base64Image, error_1;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
_a.trys.push([0, 2, , 3]);
url = node.getAttribute(attrName) || '';
// 已经是 base64 图片，不需要处理
if (url.startsWith('data:')) {
return [2 /*return*/];
}
return [4 /*yield*/, convertImageToBase64(url)];
case 1:
base64Image = _a.sent();
if (isTextPlainBase64(base64Image)) {
return [2 /*return*/];
}
node.setAttribute(attrName, base64Image);
return [3 /*break*/, 3];
case 2:
error_1 = _a.sent();
console.error(error_1);
return [3 /*break*/, 3];
case 3: return [2 /*return*/];
}
});
});
}
/**
* 使用 base64 的图片替换背景图片
* @param node - html 节点
* @param styleAttr - 样式属性名称
*/
export function updateBackgroundImageWithBase64Image(node, url) {
return __awaiter(this, void 0, void 0, function () {
var base64Image, error_2;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
_a.trys.push([0, 2, , 3]);
// 已经是 base64 图片，不需要处理
if (url.startsWith('data:')) {
return [2 /*return*/];
}
return [4 /*yield*/, convertImageToBase64(url)];
case 1:
base64Image = _a.sent();
if (isTextPlainBase64(base64Image)) {
return [2 /*return*/];
}
node.style.backgroundImage = "url(".concat(base64Image, ")");
return [3 /*break*/, 3];
case 2:
error_2 = _a.sent();
console.error(error_2);
return [3 /*break*/, 3];
case 3: return [2 /*return*/];
}
});
});
}
/**
* 更新图片数据
* @param node - 节点
*/
export function updateImageSource(node) {
return __awaiter(this, void 0, void 0, function () {
var nodes, nodePtr, promises, _a, background, backgroundImage, backgroundUrlMatch, imageUrl, backgroundImageUrlMatch, imageUrl;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
nodes = [node];
promises = [];
while (nodes.length) {
nodePtr = nodes.shift();
if (nodePtr.children.length) {
nodes.push.apply(nodes, __spreadArray([], __read(nodePtr.children), false));
}
if (nodePtr instanceof HTMLElement) {
_a = nodePtr.style, background = _a.background, backgroundImage = _a.backgroundImage;
backgroundUrlMatch = background.match(/url\(["']?(.*?)["']?\)/);
if (backgroundUrlMatch && backgroundUrlMatch[1]) {
imageUrl = backgroundUrlMatch[1];
promises.push(updateBackgroundImageWithBase64Image(nodePtr, imageUrl));
}
backgroundImageUrlMatch = backgroundImage.match(/url\(["']?(.*?)["']?\)/);
if (backgroundImageUrlMatch && backgroundImageUrlMatch[1]) {
imageUrl = backgroundImageUrlMatch[1];
promises.push(updateBackgroundImageWithBase64Image(nodePtr, imageUrl));
}
}
// 如果有 img 和 image 标签，尝试将 src 和 href 替换为 base64 图片
if (nodePtr instanceof HTMLImageElement) {
promises.push(updateImageSrcOrHrefWithBase64Image(nodePtr, 'src'));
}
else if (nodePtr instanceof SVGImageElement) {
promises.push(updateImageSrcOrHrefWithBase64Image(nodePtr, 'href'));
}
}
return [4 /*yield*/, Promise.all(promises)];
case 1:
_b.sent();
return [2 /*return*/];
}
});
});
}
/**
* 重新复制canvas 用于在不裁剪原canvas的基础上通过拉伸方式达到自定义宽高目的
* @param originCanvas HTMLCanvasElement
* @param targetWidth number
* @param targetHeight number
*/
export function copyCanvas(originCanvas, targetWidth, targetHeight) {
var newCanvas = document.createElement('canvas');
newCanvas.width = targetWidth;
newCanvas.height = targetHeight;
var newCtx = newCanvas.getContext('2d');
if (newCtx) {
// 注意: 自定义宽高时，可能会拉伸图形，这时候padding也会被拉伸导致不准确
newCtx.drawImage(originCanvas, 0, 0, originCanvas.width, originCanvas.height, 0, 0, targetWidth, targetHeight);
}
return newCanvas;
}