vue内容拖拽放大缩小

提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示

<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="https://unpkg.com/vue@2.6.14/dist/vue.min.js"></script>
</head>
<body>
<div id="app">
<div id="drag" @mousewheel="changeCanvas($event)"
@mousedown="mouseDrag($event)" @dragover="allowDrop($event)" @dragenter="dragEnter($event)"
@mouseup="mouseUp($event)" @mousemove="mouseMove($event)">
<div id="flowContainer" ref="flowContainer"></div>
</div>
</div>
<script>
new Vue({
el: '#app',
data() {
return {
msg: '111',
zoomNum: 1,
disX: null,
disY: null,
mainX: null,
mainY: null,
ifDrag: false,
}
},
methods: {
allowDrop(evt) {
this.preventDefault(evt);
},
dragEnter(evt) {
this.preventDefault(evt);
},
//阻止冒泡以及默认事件
preventDefault(ev) {
var evt = ev || window.event;
if (typeof evt.preventDefault == "function") {
evt.preventDefault();
} else {
evt.returnValue = false;
}
if (typeof evt.stopPropagation == "function") {
evt.stopPropagation();
} else {
evt.cancelBubble = true
}
},
// ==漫游====
// 拖拽
mouseDrag(e) {
// console.log('拖拽',e);
this.linemove = false
// console.log(e)
let _this = this;
this.ifDrag = true;
let pos = _this.getPos(e); //获取鼠标坐标
_this.disX = pos.x;
_this.disY = pos.y;
_this.mainX = _this.$refs.flowContainer.offsetLeft;
_this.mainY = _this.$refs.flowContainer.offsetTop;
// if (this.ifDrag) {
// this.mouseMove(e);
// }
},
mouseMove(e) {
// console.log('move', document)
var _this = this;
// document.onmousemove = function (e) {
// debugger
// console.log(e)
// e.preventDefault()
if (!this.ifDrag) {
return
}
var evt = window.event || e;
var left = (evt.clientX - _this.disX) + _this.mainX;
var top = (evt.clientY - _this.disY) + _this.mainY;
_this.$refs.flowContainer.style.left = left + 'px';
_this.$refs.flowContainer.style.top = top + 'px';
// }
// this.mouseUp();
},
mouseUp() {
// console.log('up', document.onmousemove)
var _this = this;
this.ifDrag = false
//鼠标抬起
document.onmouseup = function (e) {
// console.log(e)
var evt = window.event || e;
// document.onmousemove = null;
// document.onmouseup = null;
// _this.ifDrag = false;
};
},
// 获取位置
getPos(ev) {
let scrollTop = document.documentElement.scrollTop || document.body.scrollTop;
let scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft;
return { x: ev.clientX + scrollLeft, y: ev.clientY + scrollTop };
},
// 改变画布大小--通过鼠标滚轮缩小，放大
changeCanvas(event) {
var delta = 0;
var canvasDom = document.getElementById('flowContainer');
var p = ["webkit", "moz", "ms", "o"];
if (!event) event = window.event;
if (event.wheelDelta) {//IE、chrome浏览器使用的是wheelDelta，并且值为“正负120”
delta = event.wheelDelta / 120;
if (window.opera) delta = -delta;//因为IE、chrome等向下滚动是负值，FF是正值，为了处理一致性，在此取反处理
} else if (event.detail) {//FF浏览器使用的是detail,其值为“正负3”
delta = -event.detail / 3;
}
if (delta > 0) {
// 向上滚
if (this.zoomNum < 2) {
this.zoomNum += 0.1;
}
} else if (delta < 0) {
// 向下滚
if (this.zoomNum > 0.2) {
this.zoomNum -= 0.1;
}
}
for (var i = 0; i < p.length; i++) {
canvasDom.style[p[i] + "Transform"] = "scale(" + this.zoomNum + ")";
}
canvasDom.style["transform"] = "scale(" + this.zoomNum + ")";
return false;
},
}
})
</script>
</body>
<style>
#drag{
width:800px;
height:800px;
background:blue;
overflow:hidden;
}
#flowContainer{
width:300px;
height:300px;
background:red;
position: relative;
overflow: hidden;
left: 20px;
top: 20px;
transform-origin: 50% 50%;
}
</style>
</html>