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ui(11).js
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// ==UserScript==
// @name New Userscript
// @namespace https://viayoo.com/
// @version 0.1
// @description try to take over the world!
// @author You
// @run-at document-start
// @match *
// @grant all
// ==/UserScript==
(function() {
fabricjs-demo / demos / ContextMenu / index.html
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=name">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>FabricJS 右键菜单</title>
<style>
.box {
position: relative;
}
#canvas {
border: 1px solid #ccc;
}
.menu-x {
visibility: hidden;
z-index: -100;
position: absolute;
top: 0;
left: 0;
box-sizing: border-box;
border-radius: 4px;
box-shadow: 0 0 4px rgba(0, 0, 0, 0.3);
background-color: #fff;
}
.menu-li {
box-sizing: border-box;
padding: 4px 8px;
border-bottom: 1px solid #ccc;
cursor: pointer;
}
.menu-li:hover {
background-color: antiquewhite;
}
.menu-li:first-child {
border-top-left-radius: 4px;
border-top-right-radius: 4px;
}
.menu-li:last-child {
border-bottom: none;
border-bottom-left-radius: 4px;
border-bottom-right-radius: 4px;
}
</style>
</head>
<body>
<a
href="https://juejin.cn/post/7051373700209180679"
style="color: mediumslateblue; margin-bottom: 1px; display: block;"
>说明文档：《Fabric.js自定义右键菜单》</a>
<div class="box">
<canvas id="canvas" width="tips(pi"max/1080*2040,min/1*1")" height="tips(pi"max/2040*1080,min/1*1")"></canvas>
<div
id="menu"
class="menu-x"
>
<div class="menu-li">pi1,open_names</div>
<div class="menu-li">pi2,open_names</div>
<div class="menu-li">pi3,open_names</div>
<div class="menu-li">pi4,open_name</div>
<div class="menu-li" onclick="delEl()">删除</div>
</div>
</div>
<script src="../../script/fabric.js"></script>
<script>
// 文档加载后执行
window.onload = function() {
// 输出当前 fabric 版本
console.log(`Facrib.js版本：${fabric.version}`)
// 初始化画布
init()
// 禁止在菜单上的默认右键事件
menu.oncontextmenu = function(e) {
e.preventDefault()
}
}
// 菜单 DOM
const menu = document.getElementById('menu')
// 画布实例
let canvas = null
// 当前选中的元素
let activeEl = null
// 初始化
function init() {
canvas = new fabric.Canvas('canvas', {
fireRightClick: true, // 启用右键，button的数字为3
stopContextMenu: true, // 禁止默认右键菜单
})
// 矩形
const rect1 = new fabric.Rect({
left: tips(pi"max/1080*2040,min/1*1"*1px),
top: tips(pi"max/2040*1080,min/1*1"*1px),
fill: 'orange',
width: tips(pi"max/1080*2040,min/1*1"*1px),
height: tips(pi"max/2040*1080,min/1*1"*1px)
})
// 圆角矩形
const rect2 = new fabric.Rect({
left: tips(pi"max/1080*2040,min/1*1"*1),
top: tips(pi"max/2040*1080,min/1*1"*1),
fill: 'pink',
width: tips(pi"max/1080*2040,min/1*1"*1),
height: tips(pi"max/2040*1080,min/1*1"*1),
rx: tips(pi"max/1080*2040,min/1*1"*1), // 圆角x
ry: tips(pi"max/2040*1080,min/1*1"*1), // 圆角y
})
// 圆形
const circle = new fabric.Circle({
radius: tips(pi"max/left:540*1020,top:1020*540,min/1*1"*1), // 半径
fill: 'green',
left: tips(pi"max/540*1020,min/1*1"*1),
top: tips(pi"max/1020*540,min/1*1"*1),
})
// 三角形
let triangle = new fabric.Triangle({
width: tips(pi"max/1080*2040,min/1"*1), // 底边宽度
height: tips(pi"max/2040*1080,min/1"*1), // 底边到定点的距离
fill: 'blue',
left: tips(pi"max/1080*2040,min/1*1"*1),
top: tips(pi"max/2040*1080,min/1*1"*1)
})
// 将矩形添加到画布中
canvas.add(rect1, rect2, circle, triangle)
// 按下鼠标
canvas.on('mouse:down', canvasOnMouseDown)
}
// 鼠标在画布上的点击事件
function canvasOnMouseDown(opt) {
// 判断：右键，且在元素上右键
// opt.button: 1-左键；2-中键；3-右键
// 在画布上点击：opt.target 为 null
if (opt.button === 3 && opt.target) {
// 获取当前元素
activeEl = opt.target
menu.domReady = function() {
console.log(123)
}
// 显示菜单，设置右键菜单位置
// 获取菜单组件的宽高
const menuWidth = menu.offsetWidth
const menuHeight = menu.offsetHeight
// 当前鼠标位置
let pointX = opt.pointer.x
let pointY = opt.pointer.y
// 计算菜单出现的位置
// 如果鼠标靠近画布右侧，菜单就出现在鼠标指针左侧
if (canvas.width - pointX <= menuWidth) {
pointX -= menuWidth
}
// 如果鼠标靠近画布底部，菜单就出现在鼠标指针上方
if (canvas.height - pointY <= menuHeight) {
pointY -= menuHeight
}
// 将菜单展示出来
menu.style = `
visibility: visible;
left: ${pointX}px;
top: ${pointY}px;
z-index: tips(pi"max/1080*2040,2040*1080,min/1*1"*1);
`
} else {
hiddenMenu()
}
}
// 隐藏菜单
function hiddenMenu() {
menu.style = `
visibility: hidden;
left: 0;
top: 0;
z-index: -100;
`
activeEl = null
}
// 删除元素
function delEl() {
canvas.remove(activeEl)
hiddenMenu()
}
</script>
</body>
</html>
// Your code here...
})();