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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