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editor1.html
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editor1.html
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<html>
<head>
<meta charset="utf-8" />
<title>editor</title>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta name="full-screen" content="true" />
<style>
:root {
--line-height: 19px;
}
* {
margin: 0;
padding: 0;
}
#editor {
position: relative;
width: calc(100%-40px);
height: 500px;
font-family: Consolas, "Courier New", monospace;
/* font-family: ui-monospace,SFMono-Regular,SF Mono,Menlo,Consolas,Liberation Mono,monospace; */
background-color: #eee;
user-select: none;
cursor: text;
margin: 20px;
}
.view-lines {
font-size: 14px;
}
.view-line {
/* font-family: Consolas, "Courier New", monospace; */
height: var(--line-height);
}
textarea {
position: absolute;
top: 0;
left: 0;
width: 1px;
height: 1px;
opacity: 0;
}
/* 设置光标的样式 */
.cursor {
position: absolute;
display: inline-block;
width: 2px;
height: var(--line-height);
top: 0;
left: 0;
background-color: black;
animation: blink 1s infinite;
}
/* 设置光标的闪烁效果 */
@keyframes blink {
50% {
opacity: 0;
}
}
</style>
</head>
<body>
<div id="editor">
<div class="view-lines"></div>
<textarea></textarea>
<span class="cursor"></span>
</div>
<script>
let exampleDoc = "function add(a, b) {\n return a + b \n}"
function renderDoc(lines) {
const coloredLines = document.createDocumentFragment()
for (let i = 0; i < lines.length; i++) {
const line = document.createElement("div")
line.className = "view-line"
line.innerHTML = lines[i]
.replace(/ /g, " ")
.replace(/\t/g, " ")
.replace(/function/g, '<span style="color: blue;">function</span>')
.replace(/return/g, '<span style="color: purple;">return</span>')
.replace(/\(/g, '<span style="color: blue;">(</span>')
.replace(/\)/g, '<span style="color: blue;">)</span>')
coloredLines.appendChild(line)
}
return coloredLines
}
// 尝试将以上代码封装成一个类，对外接口主要是 doc 文本内容，以及 renderDoc 的方法
class Editor {
constructor(rootEl, doc, renderer) {
this.rootEl = rootEl
this.doc = doc
this.renderer = renderer
this.lines = this.doc.split("\n")
this.pagination = {
line: 0,
column: 0,
}
this.position = {
left: 0,
top: 0,
}
this.charWidth = 7.7
this.charHeight = 16.5 // 19-16.5=2.5
this.lineHeight = 19
this.cursor = null
this.content = null
this.textarea = null
this.init()
}
init() {
this.getCharSize()
this.rootEl.style.setProperty("--line-height", this.lineHeight + "px")
this.cursor = this.rootEl.querySelector(".cursor")
this.content = this.rootEl.querySelector(".view-lines")
this.textarea = this.rootEl.querySelector("textarea")
this.textarea.addEventListener("keydown", this.handleKeydown.bind(this))
this.rootEl.addEventListener("click", (e) => {
// 根据点击的位置计算光标的位置，更新光标的位置，并且更新line和column
const x = e.clientX - this.content.getBoundingClientRect().left
const y = e.clientY - this.content.getBoundingClientRect().top
const line = Math.floor(y / this.lineHeight)
if (!this.lines[line]) return
const text = this.lines[line]
const column = Math.floor(x / this.charWidth) > text.length ? text.length : Math.floor(x / this.charWidth)
this.position.left = text.slice(0, column).length * this.charWidth
this.position.top = line * this.lineHeight
this.pagination.line = line
this.pagination.column = column
this.updatePosition()
})
if (/Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent)) {
this.textarea.addEventListener("input", (e) => {
const text = e.target.value
this.insertText(text)
e.target.value = ""
})
}
this.updateLines()
}
getCharSize() {
const span = document.createElement("span")
span.innerHTML = "a"
span.style.fontSize = "14px"
span.style.fontFamily = 'Consolas, "Courier New", monospace'
document.body.appendChild(span)
this.charWidth = Number(span.getBoundingClientRect().width.toFixed(1))
this.charHeight = Number(span.getBoundingClientRect().height.toFixed(1))
this.lineHeight = Number(2.5 + this.charHeight).toFixed(1)
document.documentElement.style.setProperty("--line-height", this.lineHeight + "px")
document.body.removeChild(span)
}
updateCursor() {
this.cursor.style.left = this.position.left + "px"
this.cursor.style.top = this.position.top + "px"
this.textarea.style.left = this.position.left + "px"
this.textarea.style.top = this.position.top + "px"
this.textarea.focus()
}
updatePosition() {
const text = this.lines[this.pagination.line]
text.length > this.pagination.column ? (this.position.left = this.pagination.column * this.charWidth) : (this.position.left = text.length * this.charWidth)
this.position.top = this.pagination.line * this.lineHeight
this.updateCursor()
}
moveLeft() {
if (this.pagination.column > 0) {
this.pagination.column--
} else if (this.pagination.line > 0) {
this.pagination.line--
this.pagination.column = this.lines[this.pagination.line].length
}
this.updatePosition()
}
moveRight() {
if (this.pagination.column < this.lines[this.pagination.line].length) {
this.pagination.column++
} else if (this.pagination.line < this.lines.length - 1) {
this.pagination.line++
this.pagination.column = 0
}
this.updatePosition()
}
moveUp() {
if (this.pagination.line > 0) {
this.pagination.line--
}
this.updatePosition()
}
moveDown() {
if (this.pagination.line < this.lines.length - 1) {
this.pagination.line++
}
this.updatePosition()
}
updateLines() {
this.content.innerHTML = ""
this.content.appendChild(this.renderer(this.lines))
}
insertText(text) {
if (text === "\n") {
const line = this.lines[this.pagination.line]
const left = line.slice(0, this.pagination.column)
const right = line.slice(this.pagination.column)
this.lines[this.pagination.line] = left
this.lines.splice(this.pagination.line + 1, 0, right)
this.pagination.line++
this.pagination.column = 0
} else {
this.lines[this.pagination.line] = this.lines[this.pagination.line].slice(0, this.pagination.column) + text + this.lines[this.pagination.line].slice(this.pagination.column)
this.pagination.column += text.length
}
this.updateLines()
this.updatePosition()
}
deleteText() {
if (this.pagination.column > 0) {
this.lines[this.pagination.line] = this.lines[this.pagination.line].slice(0, this.pagination.column - 1) + this.lines[this.pagination.line].slice(this.pagination.column)
this.pagination.column--
} else if (this.pagination.line > 0) {
this.pagination.line--
this.pagination.column = this.lines[this.pagination.line].length
this.lines[this.pagination.line] = this.lines[this.pagination.line].slice(0, this.pagination.column) + this.lines[this.pagination.line + 1]
this.lines.splice(this.pagination.line + 1, 1)
}
this.updateLines()
this.updatePosition()
}
handleKeydown(event) {
switch (event.key) {
case "ArrowLeft":
this.moveLeft()
break
case "ArrowRight":
this.moveRight()
break
case "ArrowUp":
this.moveUp()
break
case "ArrowDown":
this.moveDown()
break
case "Backspace":
this.deleteText()
break
case "Enter":
this.insertText("\n")
break
default:
if (event.key.length === 1) {
this.insertText(event.key)
}
}
}
}
const editor = new Editor(document.querySelector("#editor"), exampleDoc, renderDoc)
</script>
</body>
</html>