vditor
Version:
♏ 易于使用的 Markdown 编辑器，为适配不同的应用场景而生
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text/typescript
import {abcRender} from "../markdown/abcRender";
import {chartRender} from "../markdown/chartRender";
import {codeRender} from "../markdown/codeRender";
import {flowchartRender} from "../markdown/flowchartRender";
import {getMarkdown} from "../markdown/getMarkdown";
import {graphvizRender} from "../markdown/graphvizRender";
import {highlightRender} from "../markdown/highlightRender";
import {mathRender} from "../markdown/mathRender";
import {mediaRender} from "../markdown/mediaRender";
import {mermaidRender} from "../markdown/mermaidRender";
import {SMILESRender} from "../markdown/SMILESRender";
import {markmapRender} from "../markdown/markmapRender";
import {mindmapRender} from "../markdown/mindmapRender";
import {plantumlRender} from "../markdown/plantumlRender";
import {getEventName} from "../util/compatibility";
import {hasClosestByClassName, hasClosestByMatchTag} from "../util/hasClosest";
import {hasClosestByTag} from "../util/hasClosestByHeadings";
import {setSelectionFocus} from "../util/selection";
import {previewImage} from "./image";
export class Preview {
public element: HTMLElement;
public previewElement: HTMLElement;
private mdTimeoutId: number;
constructor(vditor: IVditor) {
this.element = document.createElement("div");
this.element.className = `vditor-preview`;
this.previewElement = document.createElement("div");
this.previewElement.className = "vditor-reset";
if (vditor.options.classes.preview) {
this.previewElement.classList.add(vditor.options.classes.preview);
}
this.previewElement.style.maxWidth = vditor.options.preview.maxWidth + "px";
this.previewElement.addEventListener("copy", (event: ClipboardEvent & { target: HTMLElement }) => {
if (event.target.tagName === "TEXTAREA") {
// https://github.com/Vanessa219/vditor/issues/901
return;
}
const tempElement = document.createElement("div");
tempElement.className = "vditor-reset";
tempElement.appendChild(getSelection().getRangeAt(0).cloneContents());
this.copyToX(vditor, tempElement, "default");
event.preventDefault();
});
this.previewElement.addEventListener("click", (event: MouseEvent & { target: HTMLElement }) => {
const spanElement = hasClosestByMatchTag(event.target, "SPAN");
if (spanElement && hasClosestByClassName(spanElement, "vditor-toc")) {
const headingElement =
this.previewElement.querySelector("#" + spanElement.getAttribute("data-target-id")) as HTMLElement;
if (headingElement) {
this.element.scrollTop = headingElement.offsetTop;
}
return;
}
if (event.target.tagName === "A") {
if (vditor.options.link.click) {
vditor.options.link.click(event.target);
} else if (vditor.options.link.isOpen) {
window.open(event.target.getAttribute("href"));
}
event.preventDefault();
return;
}
if (event.target.tagName === "IMG") {
if (vditor.options.image.preview) {
vditor.options.image.preview(event.target)
} else if (vditor.options.image.isPreview) {
previewImage(event.target as HTMLImageElement, vditor.options.lang, vditor.options.theme);
}
}
});
this.element.appendChild(this.previewElement);
const actions = vditor.options.preview.actions;
if (actions.length === 0) {
return;
}
const actionElement = document.createElement("div");
actionElement.className = "vditor-preview__action";
const actionHtml: string[] = [];
for (let i = 0; i < actions.length; i++) {
const action = actions[i];
if (typeof action === "object") {
actionHtml.push(`<button type="button" data-type="${action.key}" class="${action.className}"${action.tooltip ? ` aria-label="${action.tooltip}"` : ""}">${action.text}</button>`);
continue;
}
switch (action) {
case "desktop":
actionHtml.push(`<button type="button" class="vditor-preview__action--current" data-type="desktop">Desktop</button>`);
break;
case "tablet":
actionHtml.push(`<button type="button" data-type="tablet">Tablet</button>`);
break;
case "mobile":
actionHtml.push(`<button type="button" data-type="mobile">Mobile/Wechat</button>`);
break;
case "mp-wechat":
actionHtml.push(`<button type="button" data-type="mp-wechat" class="vditor-tooltipped vditor-tooltipped__w" aria-label="复制到公众号"><svg><use xlink:href="#vditor-icon-mp-wechat"></use></svg></button>`);
break;
case "zhihu":
actionHtml.push(`<button type="button" data-type="zhihu" class="vditor-tooltipped vditor-tooltipped__w" aria-label="复制到知乎"><svg><use xlink:href="#vditor-icon-zhihu"></use></svg></button>`);
break;
}
}
actionElement.innerHTML = actionHtml.join("");
actionElement.addEventListener(getEventName(), (event) => {
const btn = hasClosestByTag(event.target as HTMLElement, "BUTTON");
if (!btn) {
return;
}
const type = btn.getAttribute("data-type");
const actionCustom = actions.find((w: IPreviewActionCustom) => w?.key === type) as IPreviewActionCustom;
if (actionCustom) {
actionCustom.click(type);
return;
}
if (type === "mp-wechat" || type === "zhihu") {
this.copyToX(vditor, this.previewElement.cloneNode(true) as HTMLElement, type);
return;
}
if (type === "desktop") {
this.previewElement.style.width = "auto";
} else if (type === "tablet") {
this.previewElement.style.width = "780px";
} else {
this.previewElement.style.width = "360px";
}
if (this.previewElement.scrollWidth > this.previewElement.parentElement.clientWidth) {
this.previewElement.style.width = "auto";
}
this.render(vditor);
actionElement.querySelectorAll("button").forEach((item) => {
item.classList.remove("vditor-preview__action--current");
});
btn.classList.add("vditor-preview__action--current");
});
this.element.insertBefore(actionElement, this.previewElement);
}
public render(vditor: IVditor, value?: string) {
clearTimeout(this.mdTimeoutId);
if (this.element.style.display === "none") {
if (this.element.getAttribute("data-type") === "renderPerformance") {
vditor.tip.hide();
}
return;
}
if (value) {
this.previewElement.innerHTML = value;
return;
}
if (getMarkdown(vditor)
.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, "") === "") {
this.previewElement.innerHTML = "";
return;
}
const renderStartTime = new Date().getTime();
const markdownText = getMarkdown(vditor);
this.mdTimeoutId = window.setTimeout(() => {
if (vditor.options.preview.url) {
const xhr = new XMLHttpRequest();
xhr.open("POST", vditor.options.preview.url);
xhr.setRequestHeader("Content-Type", "application/json;charset=UTF-8");
xhr.onreadystatechange = () => {
if (xhr.readyState === XMLHttpRequest.DONE) {
if (xhr.status === 200) {
const responseJSON = JSON.parse(xhr.responseText);
if (responseJSON.code !== 0) {
vditor.tip.show(responseJSON.msg);
return;
}
if (vditor.options.preview.transform) {
responseJSON.data = vditor.options.preview.transform(responseJSON.data);
}
this.previewElement.innerHTML = responseJSON.data;
this.afterRender(vditor, renderStartTime);
} else {
let html = vditor.lute.Md2HTML(markdownText);
if (vditor.options.preview.transform) {
html = vditor.options.preview.transform(html);
}
this.previewElement.innerHTML = html;
this.afterRender(vditor, renderStartTime);
}
}
};
xhr.send(JSON.stringify({markdownText}));
} else {
let html = vditor.lute.Md2HTML(markdownText);
if (vditor.options.preview.transform) {
html = vditor.options.preview.transform(html);
}
this.previewElement.innerHTML = html;
this.afterRender(vditor, renderStartTime);
}
}, vditor.options.preview.delay);
}
private afterRender(vditor: IVditor, startTime: number) {
if (vditor.options.preview.parse) {
vditor.options.preview.parse(this.element);
}
const time = (new Date().getTime() - startTime);
if ((new Date().getTime() - startTime) > 2600) {
// https://github.com/b3log/vditor/issues/67
vditor.tip.show(window.VditorI18n.performanceTip.replace("${x}", time.toString()));
vditor.preview.element.setAttribute("data-type", "renderPerformance");
} else if (vditor.preview.element.getAttribute("data-type") === "renderPerformance") {
vditor.tip.hide();
vditor.preview.element.removeAttribute("data-type");
}
const cmtFocusElement = vditor.preview.element.querySelector(".vditor-comment--focus");
if (cmtFocusElement) {
cmtFocusElement.classList.remove("vditor-comment--focus");
}
codeRender(vditor.preview.previewElement, vditor.options.preview.hljs);
highlightRender(vditor.options.preview.hljs, vditor.preview.previewElement,
vditor.options.cdn);
mermaidRender(vditor.preview.previewElement, vditor.options.cdn, vditor.options.theme);
markmapRender(vditor.preview.previewElement, vditor.options.cdn);
SMILESRender(vditor.preview.previewElement, vditor.options.cdn, vditor.options.theme);
flowchartRender(vditor.preview.previewElement, vditor.options.cdn);
graphvizRender(vditor.preview.previewElement, vditor.options.cdn);
chartRender(vditor.preview.previewElement, vditor.options.cdn, vditor.options.theme);
mindmapRender(vditor.preview.previewElement, vditor.options.cdn, vditor.options.theme);
plantumlRender(vditor.preview.previewElement, vditor.options.cdn);
abcRender(vditor.preview.previewElement, vditor.options.cdn);
if (vditor.options.preview.render.media.enable) {
mediaRender(vditor.preview.previewElement);
}
vditor.options.customRenders.forEach((item) => {
item.render(vditor.preview.previewElement, vditor);
})
// toc render
const editorElement = vditor.preview.element;
let tocHTML = vditor.outline.render(vditor);
if (tocHTML === "") {
tocHTML = "[ToC]";
}
editorElement.querySelectorAll('[data-type="toc-block"]').forEach((item: HTMLElement) => {
item.innerHTML = tocHTML;
mathRender(item, {
cdn: vditor.options.cdn,
math: vditor.options.preview.math,
});
});
mathRender(vditor.preview.previewElement, {
cdn: vditor.options.cdn,
math: vditor.options.preview.math,
});
}
private copyToX(vditor: IVditor, copyElement: HTMLElement, type = "mp-wechat") {
// fix math render
if (type !== "zhihu") {
copyElement.querySelectorAll(".katex-html .base").forEach((item: HTMLElement) => {
item.style.display = "initial";
});
} else {
copyElement.querySelectorAll(".language-math").forEach((item: HTMLElement) => {
item.outerHTML = `<img class="Formula-image" data-eeimg="true" src="//www.zhihu.com/equation?tex=" alt="${item.getAttribute("data-math")}\\" style="display: block; margin: 0 auto; max-width: 100%;">`;
});
}
// 防止背景色被粘贴到公众号中
copyElement.style.backgroundColor = "#fff";
// 代码背景
copyElement.querySelectorAll("code").forEach((item) => {
item.style.backgroundImage = "none";
});
this.element.append(copyElement);
const range = copyElement.ownerDocument.createRange();
range.selectNode(copyElement);
setSelectionFocus(range);
document.execCommand("copy");
copyElement.remove();
vditor.tip.show(['zhihu', 'mp-wechat'].includes(type) ? `已复制，可到${type === "zhihu" ? "知乎" : "微信公众号平台"}进行粘贴` : `已复制到剪切板`);
}
}