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>
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