前言：
用vue3实现一个可在手机上拖拽元素的组件，可拖拽至任意位置，并且可以防止拖拽元素移出屏幕边缘。
<script setup>
import { ref } from "vue";
const props = defineProps({
disabled: { type: Boolean, default: false }
});
const dragPos = {
hasMoved: false, // 排除click事件
x: 0, // right
y: 0, // bottom
startX: 0,
startY: 0,
endX: 0,
endY: 0
};
const dragBoxPos = ref({ x: null, y: null });
const dragBoxRef = ref();
const setPosition = (dragX, dragY) => {
[dragX, dragY] = _getSafeAreaXY(dragX, dragY);
dragPos.x = dragX;
dragPos.y = dragY;
dragBoxPos.value.x = dragX;
dragBoxPos.value.y = dragY;
};
const _getSafeAreaXY = (x, y) => {
const docWidth = Math.max(
document.documentElement.offsetWidth,
window.innerWidth
);
const docHeight = Math.max(
document.documentElement.offsetHeight,
window.innerHeight
);
// 检查屏幕边缘
if (x + dragBoxRef.value.offsetWidth > docWidth) {
x = docWidth - dragBoxRef.value.offsetWidth;
}
if (y + dragBoxRef.value.offsetHeight > docHeight) {
y = docHeight - dragBoxRef.value.offsetHeight;
}
if (x < 0) {
x = 0;
}
// iOS底部的安全区域
if (y < 20) {
y = 20;
}
return [x, y];
};
const onTouchStart = (e) => {
if (props.disabled) return;
dragPos.startX = e.touches[0].pageX;
dragPos.startY = e.touches[0].pageY;
dragPos.hasMoved = false;
};
const onTouchEnd = (e) => {
if (props.disabled) return;
if (!dragPos.hasMoved) return;
dragPos.startX = 0;
dragPos.startY = 0;
dragPos.hasMoved = false;
setPosition(dragPos.endX, dragPos.endY);
};
const onTouchMove = (e) => {
if (props.disabled) return;
if (e.touches.length <= 0) return;
const offsetX = e.touches[0].pageX - dragPos.startX,
offsetY = e.touches[0].pageY - dragPos.startY;
let x = Math.floor(dragPos.x - offsetX),
y = Math.floor(dragPos.y - offsetY);
[x, y] = _getSafeAreaXY(x, y);
dragBoxPos.value.x = x;
dragBoxPos.value.y = y;
dragPos.endX = x;
dragPos.endY = y;
dragPos.hasMoved = true;
e.preventDefault();
};
</script>
<template>
<div
ref="dragBoxRef"
class="tvb-drag-box"
:class="{ disabled: disabled }"
:style="
disabled ? '' : `right: ${dragBoxPos.x}px; bottom: ${dragBoxPos.y}px;`
"
@touchstart="onTouchStart"
@touchend="onTouchEnd"
@touchmove="onTouchMove"
>
<slot></slot>
</div>
</template>
<style lang="scss" scoped>
.tvb-drag-box {
&:not(.disabled) {
position: fixed;
bottom: 10px;
right: 10px;
overflow: hidden;
z-index: 99;
}
}
</style>使用方式：
<drag-box>
<button>我是内容</button>
</drag-box>到此这篇关于vue3实现手机上可拖拽元素的组件的文章就介绍到这了,更多相关vue3可拖拽元素组件内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
