光标移动
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cursor.js
Normal file
121
cursor.js
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@ -0,0 +1,121 @@
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export const cursors = []
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export class Cursor {
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constructor(targetNode = null, insertIndex = null) {
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this.targetNode = targetNode // 初始时可以直接指定目标文本节点
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this.insertIndex = insertIndex // 初始时可以直接指定插入位置索引
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this.range = document.createRange()
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this.cursorElement = this.createCursorElement()
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document.body.appendChild(this.cursorElement)
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}
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// 创建光标元素
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createCursorElement() {
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const cursorElement = document.createElement("div")
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Object.assign(cursorElement.style, {
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position: "absolute",
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width: "2px",
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height: "1em",
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backgroundColor: "black",
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zIndex: "9999",
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pointerEvents: "none",
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display: "none", // 初始隐藏
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transition: "all 0.1s ease"
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})
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return cursorElement
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}
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// 设置目标文本节点和插入位置
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setTarget(node, index) {
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this.targetNode = node
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this.insertIndex = index
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this.updateRange()
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}
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// 更新范围
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updateRange() {
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if (this.targetNode && this.insertIndex !== null) {
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this.range.setStart(this.targetNode, this.insertIndex)
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this.range.setEnd(this.targetNode, this.insertIndex)
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}
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}
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// 插入文本
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insertText(text) {
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const insertionNode = document.createTextNode(text)
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this.updateRange()
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this.range.insertNode(insertionNode)
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// 更新插入位置
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this.insertIndex += text.length
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this.updateRange() // 更新光标范围
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return insertionNode
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}
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// 获取当前光标的矩形位置
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getBoundingClientRect() {
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this.updateRange()
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return this.range.getBoundingClientRect()
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}
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// 更新光标位置
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updatePosition(rect) {
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if (!rect) {
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this.hide()
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return
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}
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this.cursorElement.style.left = `${rect.left}px`
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this.cursorElement.style.top = `${rect.top}px`
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this.cursorElement.style.display = "block"
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}
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// 隐藏光标
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hide() {
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this.cursorElement.style.display = "none"
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}
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// 移除光标元素
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remove() {
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this.cursorElement.remove()
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}
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move(key) {
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// 获取目标节点的上下兄弟节点（li元素)
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const children = Array.from(this.targetNode.parentNode.parentNode.children)
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const siblings = children.filter(node => {
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return node !== this.targetNode && node.nodeType === Node.ELEMENT_NODE
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}).map(item => {
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return Array.from(item.childNodes).find(node => node.nodeType === Node.TEXT_NODE)
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})
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const currentIndex = siblings.indexOf(this.targetNode)
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if (key === "ArrowUp" && currentIndex > 0) {
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const prevSibling = siblings[currentIndex - 1]
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const length = prevSibling.textContent.length
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const index = length < this.insertIndex ? length : this.insertIndex
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this.setTarget(prevSibling, index) // 光标在上一个兄弟元素的起始位置
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return
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}
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if (key === "ArrowDown" && currentIndex >= 0 && currentIndex < siblings.length - 1) {
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const nextSibling = siblings[currentIndex + 1]
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const length = nextSibling.textContent.length
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const index = length < this.insertIndex ? length : this.insertIndex
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this.setTarget(nextSibling, index) // 光标在下一个兄弟元素的起始位置
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return
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}
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if (key === "ArrowLeft" && this.insertIndex > 0) {
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this.insertIndex = Math.max(0, Math.min(this.targetNode.textContent.length, this.insertIndex - 1))
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this.updateRange()
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return
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}
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if (key === "ArrowRight" && this.insertIndex < this.targetNode.textContent.length) {
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this.insertIndex = Math.max(0, Math.min(this.targetNode.textContent.length, this.insertIndex + 1))
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this.updateRange()
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return
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}
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}
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}
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export default { cursors, Cursor }
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156
markdown.js
156
markdown.js
@ -1,4 +1,5 @@
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import { Marked } from "marked"
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import { cursors, Cursor } from "./cursor"
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// 示例 Markdown 文本
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const markdown = `
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@ -17,125 +18,6 @@ const markdown = `
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const marked = new Marked()
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const tokens = marked.lexer(markdown)
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// 光标
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class Cursor {
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constructor(targetNode = null, insertIndex = null) {
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this.targetNode = targetNode // 初始时可以直接指定目标文本节点
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this.insertIndex = insertIndex // 初始时可以直接指定插入位置索引
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this.range = document.createRange()
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this.cursorElement = this.createCursorElement()
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document.body.appendChild(this.cursorElement)
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}
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// 创建光标元素
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createCursorElement() {
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const cursorElement = document.createElement("div")
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Object.assign(cursorElement.style, {
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position: "absolute",
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width: "2px",
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height: "1em",
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backgroundColor: "black",
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zIndex: "9999",
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pointerEvents: "none",
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display: "none", // 初始隐藏
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})
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return cursorElement
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}
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// 设置目标文本节点和插入位置
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setTarget(node, index) {
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this.targetNode = node
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this.insertIndex = index
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this.updateRange()
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}
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// 更新插入位置索引
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updateInsertIndex(offset) {
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this.insertIndex = Math.max(0, Math.min(this.targetNode.textContent.length, this.insertIndex + offset))
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this.updateRange()
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}
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// 更新范围
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updateRange() {
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if (this.targetNode && this.insertIndex !== null) {
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this.range.setStart(this.targetNode, this.insertIndex)
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this.range.setEnd(this.targetNode, this.insertIndex)
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}
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}
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// 插入文本
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insertText(text) {
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const insertionNode = document.createTextNode(text)
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this.updateRange()
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this.range.insertNode(insertionNode)
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// 更新插入位置
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this.insertIndex += text.length
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this.updateRange() // 更新光标范围
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return insertionNode
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}
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// 获取当前光标的矩形位置
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getBoundingClientRect() {
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this.updateRange()
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return this.range.getBoundingClientRect()
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}
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// 更新光标位置
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updatePosition(rect) {
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if (!rect) {
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this.hide()
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return
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}
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this.cursorElement.style.left = `${rect.left}px`
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this.cursorElement.style.top = `${rect.top}px`
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this.cursorElement.style.display = "block"
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}
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// 隐藏光标
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hide() {
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this.cursorElement.style.display = "none"
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}
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// 移除光标元素
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remove() {
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this.cursorElement.remove()
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}
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// 获取目标节点的上下兄弟节点
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getSiblingNodes() {
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const parent = this.targetNode.parentNode
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const siblings = Array.from(parent.childNodes).filter(
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(node) => node !== this.targetNode && node.nodeType === Node.TEXT_NODE
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)
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return siblings
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}
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// 根据当前光标位置移动到上下兄弟节点
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moveUp() {
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console.log('根据当前光标位置移动到上下兄弟节点')
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const siblings = this.getSiblingNodes()
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const currentIndex = siblings.indexOf(this.targetNode)
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if (currentIndex > 0) {
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const prevSibling = siblings[currentIndex - 1]
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this.setTarget(prevSibling, prevSibling.textContent.length)
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}
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}
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moveDown() {
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const siblings = this.getSiblingNodes()
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const currentIndex = siblings.indexOf(this.targetNode)
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if (currentIndex < siblings.length - 1) {
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const nextSibling = siblings[currentIndex + 1]
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this.setTarget(nextSibling, 0)
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}
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}
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}
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// 光标集合，存储所有光标
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const cursors = []
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let defaultCursor = new Cursor() // 初始创建默认光标
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cursors.push(defaultCursor) // 将默认光标添加到光标集合
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// 创建 textarea 接受输入
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const textarea = document.createElement("textarea")
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Object.assign(textarea.style, {
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@ -174,26 +56,10 @@ textarea.oninput = () => {
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// 处理方向键移动插入点
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textarea.onkeydown = (event) => {
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console.log(event.key)
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if (!cursors.length) return
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cursors.forEach(cursor => {
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if (!cursor.targetNode || cursor.insertIndex === null) return
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if (event.key === "ArrowLeft") {
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cursor.updateInsertIndex(-1)
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} else if (event.key === "ArrowRight") {
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cursor.updateInsertIndex(1)
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} else if (event.key === "ArrowUp") {
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cursor.moveUp()
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} else if (event.key === "ArrowDown") {
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cursor.moveDown()
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}
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cursors.filter(cursor => cursor.targetNode && cursor.insertIndex !== null).forEach(cursor => {
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cursor.move(event.key)
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updateCursors()
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})
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// 更新光标位置
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updateCursors()
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}
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// 更新所有光标的位置
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@ -260,19 +126,19 @@ element.onclick = (event) => {
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// 设置光标的目标节点和插入位置
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cursors.forEach(cursor => cursor.setTarget(targetNode, insertIndex))
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// 如果是点击多个光标的情况，增加新光标
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if (event.ctrlKey || !cursors.length) {
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const newCursor = new Cursor(targetNode, insertIndex)
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cursors.push(newCursor)
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console.log("新增光标")
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}
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// 更新光标位置
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updateCursors()
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// 聚焦输入框
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textarea.value = ""
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textarea.focus()
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// 如果是点击多个光标的情况，增加新光标
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if (event.ctrlKey) {
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const newCursor = new Cursor(targetNode, insertIndex)
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cursors.push(newCursor)
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console.log("新增光标")
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}
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}
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// 按删除键移除光标
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