vue图片拖拉转放大缩小组件使用详解
vue图片拖拉转放大缩小组件的具体使用方法,供大家参考,具体内容如下
<doc> 图片组件 - 用户放大缩小以及拖拽 </doc> <template> <div style="width: 100%;position: relative;overflow: hidden;text-align: center;border: 1px solid #f1f2f3;"> <el-button size='mini' @click="toBIgChange" icon="el-icon-zoom-in" style="position: absolute;top: 2px ;left: 2px;z-index: 999;"></el-button> <el-button size='mini' @click="toSmallChange" icon="el-icon-zoom-out" style="position: absolute;top: 2px ;left: 40px;z-index: 999;"></el-button> <img id="img" :src="src" alt="" @mousedown.prevent="dropImage" :style="{transform:'scale('+multiples+')'}"> </div> </template> <script> export default { props: ['src'], data() { return { multiples: 1, odiv: null, } }, mounted() { this.dropImage() }, watch: { src(newValue, oldValue) { this.multiples = 1 if (this.odiv !== null) { this.odiv.style.left = '0px'; this.odiv.style.top = '0px'; } }, }, methods: { toBIgChange() { if (this.multiples >= 2) { return; } this.multiples += 0.25; }, // 缩小 toSmallChange() { if (this.multiples <= 1) { return; } this.multiples -= 0.25; }, // 拖拽 dropImage(e) { if (e === null) { return } this.odiv = e.target; //获取目标元素 //算出鼠标相对元素的位置 let disX = e.clientX - this.odiv.offsetLeft; let disY = e.clientY - this.odiv.offsetTop; document.onmousemove = (e) => { //鼠标按下并移动的事件 //用鼠标的位置减去鼠标相对元素的位置,得到元素的位置 let left = e.clientX - disX; let top = e.clientY - disY; //绑定元素位置到positionX和positionY上面 this.positionX = top; this.positionY = left; //移动当前元素 this.odiv.style.left = left + 'px'; this.odiv.style.top = top + 'px'; }; document.onmouseup = (e) => { document.onmousemove = null; document.onmouseup = null; }; }, } } </script> <style scoped> img { width: 100%; position: relative; } </style>
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