593 lines
15 KiB
TypeScript
593 lines
15 KiB
TypeScript
import Token from "markdown-it/lib/token";
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import { DownloadIcon } from "outline-icons";
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import { InputRule } from "prosemirror-inputrules";
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import { Node as ProsemirrorNode, NodeSpec, NodeType } from "prosemirror-model";
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import {
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Plugin,
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TextSelection,
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NodeSelection,
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EditorState,
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Transaction,
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} from "prosemirror-state";
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import * as React from "react";
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import ImageZoom from "react-medium-image-zoom";
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import styled from "styled-components";
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import getDataTransferFiles from "../../utils/getDataTransferFiles";
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import insertFiles, { Options } from "../commands/insertFiles";
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import { MarkdownSerializerState } from "../lib/markdown/serializer";
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import uploadPlaceholderPlugin from "../lib/uploadPlaceholder";
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import { ComponentProps } from "../types";
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import Node from "./Node";
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/**
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* Matches following attributes in Markdown-typed image: [, alt, src, class]
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*
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* Example:
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*  -> [, "Lorem", "image.jpg"]
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*  -> [, "", "image.jpg", "small"]
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*  -> [, "Lorem", "image.jpg", "small"]
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*/
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const IMAGE_INPUT_REGEX = /!\[(?<alt>[^\][]*?)]\((?<filename>[^\][]*?)(?=“|\))“?(?<layoutclass>[^\][”]+)?”?\)$/;
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const uploadPlugin = (options: Options) =>
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new Plugin({
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props: {
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handleDOMEvents: {
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paste(view, event: ClipboardEvent): boolean {
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if (
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(view.props.editable && !view.props.editable(view.state)) ||
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!options.uploadImage
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) {
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return false;
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}
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if (!event.clipboardData) {
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return false;
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}
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// check if we actually pasted any files
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const files = Array.prototype.slice
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.call(event.clipboardData.items)
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.map((dt: any) => dt.getAsFile())
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.filter((file: File) => file);
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if (files.length === 0) {
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return false;
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}
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const { tr } = view.state;
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if (!tr.selection.empty) {
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tr.deleteSelection();
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}
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const pos = tr.selection.from;
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insertFiles(view, event, pos, files, options);
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return true;
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},
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drop(view, event: DragEvent): boolean {
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if (
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(view.props.editable && !view.props.editable(view.state)) ||
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!options.uploadImage
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) {
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return false;
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}
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// filter to only include image files
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const files = getDataTransferFiles(event).filter((file) =>
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/image/i.test(file.type)
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);
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if (files.length === 0) {
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return false;
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}
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// grab the position in the document for the cursor
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const result = view.posAtCoords({
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left: event.clientX,
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top: event.clientY,
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});
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if (result) {
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insertFiles(view, event, result.pos, files, options);
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return true;
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}
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return false;
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},
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},
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},
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});
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const IMAGE_CLASSES = ["right-50", "left-50"];
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const getLayoutAndTitle = (tokenTitle: string | null) => {
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if (!tokenTitle) {
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return {};
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}
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if (IMAGE_CLASSES.includes(tokenTitle)) {
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return {
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layoutClass: tokenTitle,
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};
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} else {
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return {
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title: tokenTitle,
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};
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}
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};
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const downloadImageNode = async (node: ProsemirrorNode) => {
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const image = await fetch(node.attrs.src);
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const imageBlob = await image.blob();
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const imageURL = URL.createObjectURL(imageBlob);
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const extension = imageBlob.type.split("/")[1];
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const potentialName = node.attrs.alt || "image";
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// create a temporary link node and click it with our image data
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const link = document.createElement("a");
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link.href = imageURL;
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link.download = `${potentialName}.${extension}`;
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document.body.appendChild(link);
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link.click();
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// cleanup
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document.body.removeChild(link);
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};
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export default class Image extends Node {
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options: Options;
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get name() {
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return "image";
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}
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get schema(): NodeSpec {
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return {
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inline: true,
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attrs: {
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src: {},
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alt: {
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default: null,
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},
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layoutClass: {
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default: null,
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},
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title: {
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default: null,
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},
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},
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content: "text*",
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marks: "",
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group: "inline",
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selectable: true,
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draggable: true,
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parseDOM: [
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{
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tag: "div[class~=image]",
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getAttrs: (dom: HTMLDivElement) => {
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const img = dom.getElementsByTagName("img")[0];
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const className = dom.className;
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const layoutClassMatched =
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className && className.match(/image-(.*)$/);
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const layoutClass = layoutClassMatched
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? layoutClassMatched[1]
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: null;
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return {
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src: img?.getAttribute("src"),
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alt: img?.getAttribute("alt"),
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title: img?.getAttribute("title"),
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layoutClass: layoutClass,
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};
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},
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},
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{
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tag: "img",
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getAttrs: (dom: HTMLImageElement) => {
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return {
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src: dom.getAttribute("src"),
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alt: dom.getAttribute("alt"),
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title: dom.getAttribute("title"),
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};
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},
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},
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],
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toDOM: (node) => {
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const className = node.attrs.layoutClass
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? `image image-${node.attrs.layoutClass}`
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: "image";
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return [
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"div",
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{
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class: className,
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},
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["img", { ...node.attrs, contentEditable: "false" }],
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["p", { class: "caption" }, 0],
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];
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},
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};
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}
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handleKeyDown = ({
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node,
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getPos,
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}: {
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node: ProsemirrorNode;
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getPos: () => number;
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}) => (event: React.KeyboardEvent<HTMLSpanElement>) => {
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// Pressing Enter in the caption field should move the cursor/selection
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// below the image
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if (event.key === "Enter") {
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event.preventDefault();
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const { view } = this.editor;
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const $pos = view.state.doc.resolve(getPos() + node.nodeSize);
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view.dispatch(
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view.state.tr.setSelection(new TextSelection($pos)).split($pos.pos)
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);
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view.focus();
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return;
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}
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// Pressing Backspace in an an empty caption field should remove the entire
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// image, leaving an empty paragraph
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if (event.key === "Backspace" && event.currentTarget.innerText === "") {
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const { view } = this.editor;
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const $pos = view.state.doc.resolve(getPos());
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const tr = view.state.tr.setSelection(new NodeSelection($pos));
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view.dispatch(tr.deleteSelection());
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view.focus();
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return;
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}
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};
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handleBlur = ({
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node,
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getPos,
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}: {
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node: ProsemirrorNode;
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getPos: () => number;
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}) => (event: React.FocusEvent<HTMLSpanElement>) => {
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const alt = event.currentTarget.innerText;
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const { src, title, layoutClass } = node.attrs;
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if (alt === node.attrs.alt) {
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return;
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}
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const { view } = this.editor;
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const { tr } = view.state;
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// update meta on object
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const pos = getPos();
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const transaction = tr.setNodeMarkup(pos, undefined, {
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src,
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alt,
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title,
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layoutClass,
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});
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view.dispatch(transaction);
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};
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handleSelect = ({ getPos }: { getPos: () => number }) => (
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event: React.MouseEvent
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) => {
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event.preventDefault();
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const { view } = this.editor;
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const $pos = view.state.doc.resolve(getPos());
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const transaction = view.state.tr.setSelection(new NodeSelection($pos));
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view.dispatch(transaction);
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};
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handleDownload = ({ node }: { node: ProsemirrorNode }) => (
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event: React.MouseEvent
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) => {
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event.preventDefault();
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event.stopPropagation();
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downloadImageNode(node);
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};
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handleMouseDown = (ev: React.MouseEvent<HTMLParagraphElement>) => {
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if (document.activeElement !== ev.currentTarget) {
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ev.preventDefault();
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ev.stopPropagation();
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ev.currentTarget.focus();
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}
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};
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component = (props: ComponentProps) => {
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const { theme, isSelected } = props;
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const { alt, src, layoutClass } = props.node.attrs;
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const className = layoutClass ? `image image-${layoutClass}` : "image";
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return (
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<div contentEditable={false} className={className}>
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<ImageWrapper
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className={isSelected ? "ProseMirror-selectednode" : ""}
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onClick={this.handleSelect(props)}
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>
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<Button>
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<DownloadIcon
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color="currentColor"
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onClick={this.handleDownload(props)}
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/>
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</Button>
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<ImageZoom
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image={{
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src,
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alt,
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}}
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defaultStyles={{
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overlay: {
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backgroundColor: theme.background,
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},
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}}
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shouldRespectMaxDimension
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/>
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</ImageWrapper>
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<Caption
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onKeyDown={this.handleKeyDown(props)}
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onBlur={this.handleBlur(props)}
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onMouseDown={this.handleMouseDown}
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className="caption"
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tabIndex={-1}
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role="textbox"
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contentEditable
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suppressContentEditableWarning
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data-caption={this.options.dictionary.imageCaptionPlaceholder}
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>
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{alt}
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</Caption>
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</div>
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);
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};
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toMarkdown(state: MarkdownSerializerState, node: ProsemirrorNode) {
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let markdown =
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" ![" +
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state.esc((node.attrs.alt || "").replace("\n", "") || "", false) +
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"](" +
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state.esc(node.attrs.src, false);
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if (node.attrs.layoutClass) {
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markdown += ' "' + state.esc(node.attrs.layoutClass, false) + '"';
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} else if (node.attrs.title) {
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markdown += ' "' + state.esc(node.attrs.title, false) + '"';
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}
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markdown += ")";
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state.write(markdown);
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}
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parseMarkdown() {
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return {
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node: "image",
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getAttrs: (token: Token) => {
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return {
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src: token.attrGet("src"),
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alt:
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(token?.children &&
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token.children[0] &&
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token.children[0].content) ||
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null,
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...getLayoutAndTitle(token?.attrGet("title")),
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};
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},
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};
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}
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commands({ type }: { type: NodeType }) {
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return {
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downloadImage: () => (state: EditorState) => {
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if (!(state.selection instanceof NodeSelection)) {
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return false;
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}
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const { node } = state.selection;
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if (node.type.name !== "image") {
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return false;
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}
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downloadImageNode(node);
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return true;
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},
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deleteImage: () => (
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state: EditorState,
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dispatch: (tr: Transaction) => void
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) => {
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dispatch(state.tr.deleteSelection());
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return true;
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},
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alignRight: () => (
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state: EditorState,
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dispatch: (tr: Transaction) => void
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) => {
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if (!(state.selection instanceof NodeSelection)) {
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return false;
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}
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const attrs = {
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...state.selection.node.attrs,
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title: null,
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layoutClass: "right-50",
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};
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const { selection } = state;
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dispatch(state.tr.setNodeMarkup(selection.from, undefined, attrs));
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return true;
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},
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alignLeft: () => (
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state: EditorState,
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dispatch: (tr: Transaction) => void
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) => {
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if (!(state.selection instanceof NodeSelection)) {
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return false;
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}
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const attrs = {
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...state.selection.node.attrs,
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title: null,
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layoutClass: "left-50",
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};
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const { selection } = state;
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dispatch(state.tr.setNodeMarkup(selection.from, undefined, attrs));
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return true;
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},
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replaceImage: () => (state: EditorState) => {
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const { view } = this.editor;
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const {
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uploadImage,
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onImageUploadStart,
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onImageUploadStop,
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onShowToast,
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} = this.editor.props;
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if (!uploadImage) {
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throw new Error("uploadImage prop is required to replace images");
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}
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// create an input element and click to trigger picker
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const inputElement = document.createElement("input");
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inputElement.type = "file";
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inputElement.accept = "image/*";
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inputElement.onchange = (event: Event) => {
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const files = getDataTransferFiles(event);
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insertFiles(view, event, state.selection.from, files, {
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uploadImage,
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onImageUploadStart,
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onImageUploadStop,
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onShowToast,
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dictionary: this.options.dictionary,
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replaceExisting: true,
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});
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};
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inputElement.click();
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return true;
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},
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alignCenter: () => (
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state: EditorState,
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dispatch: (tr: Transaction) => void
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) => {
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if (!(state.selection instanceof NodeSelection)) {
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return false;
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}
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const attrs = { ...state.selection.node.attrs, layoutClass: null };
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const { selection } = state;
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dispatch(state.tr.setNodeMarkup(selection.from, undefined, attrs));
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return true;
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},
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createImage: (attrs: Record<string, any>) => (
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state: EditorState,
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dispatch: (tr: Transaction) => void
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) => {
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const { selection } = state;
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const position =
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selection instanceof TextSelection
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? selection.$cursor?.pos
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: selection.$to.pos;
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if (position === undefined) {
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return false;
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}
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const node = type.create(attrs);
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const transaction = state.tr.insert(position, node);
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dispatch(transaction);
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return true;
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},
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};
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}
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inputRules({ type }: { type: NodeType }) {
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return [
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new InputRule(IMAGE_INPUT_REGEX, (state, match, start, end) => {
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const [okay, alt, src, matchedTitle] = match;
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const { tr } = state;
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if (okay) {
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tr.replaceWith(
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start - 1,
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end,
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type.create({
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src,
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alt,
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...getLayoutAndTitle(matchedTitle),
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})
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);
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}
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return tr;
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}),
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];
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}
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get plugins() {
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return [uploadPlaceholderPlugin, uploadPlugin(this.options)];
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}
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}
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const Button = styled.button`
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position: absolute;
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top: 8px;
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right: 8px;
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border: 0;
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margin: 0;
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padding: 0;
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border-radius: 4px;
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background: ${(props) => props.theme.background};
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color: ${(props) => props.theme.textSecondary};
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width: 24px;
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height: 24px;
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display: inline-block;
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cursor: pointer;
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opacity: 0;
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transition: opacity 100ms ease-in-out;
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&:active {
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transform: scale(0.98);
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}
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&:hover {
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color: ${(props) => props.theme.text};
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opacity: 1;
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}
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`;
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const Caption = styled.p`
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border: 0;
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display: block;
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font-size: 13px;
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font-style: italic;
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font-weight: normal;
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color: ${(props) => props.theme.textSecondary};
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padding: 8px 0 4px;
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line-height: 16px;
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text-align: center;
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min-height: 1em;
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outline: none;
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background: none;
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resize: none;
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user-select: text;
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margin: 0 !important;
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cursor: text;
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&:empty:not(:focus) {
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display: none;
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}
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&:empty:before {
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color: ${(props) => props.theme.placeholder};
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content: attr(data-caption);
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pointer-events: none;
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}
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`;
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const ImageWrapper = styled.span`
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line-height: 0;
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display: inline-block;
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position: relative;
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&:hover {
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${Button} {
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opacity: 0.9;
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}
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}
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&.ProseMirror-selectednode + ${Caption} {
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display: block;
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}
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`;
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