135 lines
3.1 KiB
Vue
135 lines
3.1 KiB
Vue
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<template>
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<div
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ref="ScaleBox"
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v-dragbox
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class="ScaleBox"
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:style="{
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width: boxWidth + 'px',
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height: boxHeight + 'px'
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}"
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>
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<slot v-if="inited" />
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</div>
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</template>
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<script>
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import { createDebounce } from '@/utils'
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export default {
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name: 'ScaleBox',
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props: {
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/**
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* 使用父元素的宽高计算缩放比例
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*/
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useParentSize: {
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type: Boolean,
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default: () => {
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return false
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}
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},
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width: {
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type: Number,
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default: () => {
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return 0
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}
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},
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height: {
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type: Number,
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default: () => {
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return 0
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}
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},
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// width/height
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screenRatio: {
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type: Array,
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default: () => {
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return []
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}
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}
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},
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emits: ['inited'],
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data() {
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return {
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boxHeight: 0,
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boxWidth: 0,
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inited: false
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}
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},
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mounted() {
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this.setScale()
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window.addEventListener('resize', createDebounce(this.setScale, 300))
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},
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methods: {
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getRatio() {
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const ratioValue = this.useParentSize ? this.$el.parentElement.clientWidth / this.$el.parentElement.clientHeight : window.innerWidth / window.innerHeight
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let result = 0
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let minDiff = Infinity
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for (const ratio of this.screenRatio) {
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if (Math.abs(ratio - ratioValue) < minDiff) {
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result = ratio
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minDiff = Math.abs(ratio - ratioValue)
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}
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}
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return result
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},
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setScale() {
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// 获取到缩放比例，设置它
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let { width, height } = this
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const ratio = this.getRatio()
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if (ratio && width && !height) {
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height = width / ratio
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}
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if (ratio && !width && height) {
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width = ratio * height
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}
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this.boxHeight = height
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this.boxWidth = width
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const wh = (this.useParentSize ? this.$el.parentElement.clientHeight : window.innerHeight) / height
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const ww = (this.useParentSize ? this.$el.parentElement.clientWidth : window.innerWidth) / width
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const scale = ww < wh ? ww : wh
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if (this.$refs.ScaleBox) {
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this.$refs.ScaleBox.style.setProperty('--scale', scale)
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}
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this.$nextTick(() => {
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let clientHeight = this.$el.clientHeight
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let clientWidth = this.$el.clientWidth
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const timer = setInterval(() => {
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if (this.$el.clientHeight && this.$el.clientWidth) {
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if (this.$el.clientHeight === clientHeight && this.$el.clientWidth === clientWidth) {
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if (!this.inited) {
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this.$nextTick(() => {
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this.$emit('inited')
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})
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}
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this.inited = true
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clearInterval(timer)
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} else {
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clientHeight = this.$el.clientHeight
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clientWidth = this.$el.clientWidth
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}
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}
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}, 1000)
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})
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}
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}
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}
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</script>
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<style lang="scss" scoped>
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#ScaleBox {
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--scale: 1;
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}
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.ScaleBox {
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position: absolute;
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transform: scale(var(--scale)) translate(-50%, -50%);
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transform-origin: 0 0;
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left: 50%;
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top: 50%;
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transition: 0.3s;
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z-index: 999;
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// background: rgba(255, 0, 0, 0.3);
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}
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</style>
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