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| <template>
<div
class="ScaleBox"
ref="ScaleBox"
:style="{
width: width + 'px',
height: height + 'px',
}"
>
<slot></slot>
</div>
</template>
<script>
export default {
name: "ScaleBox",
props: {},
data() {
return {
scale: 0,
width: 1920,
height: 1080,
};
},
mounted() {
this.setScale();
window.addEventListener("resize", this.debounce(this.setScale));
},
methods: {
getScale() {
// 固定好16：9的宽高比，计算出最合适的缩放比
const { width, height } = this;
const wh = window.innerHeight / height;
const ww = window.innerWidth / width;
return ww < wh ? ww : wh;
},
setScale() {
// 获取到缩放比例，设置它
this.scale = this.getScale();
if (this.$refs.ScaleBox) {
this.$refs.ScaleBox.style.setProperty("--scale", this.scale);
}
},
debounce(fn, delay) {
const delays = delay || 100;
let timer;
return function () {
const th = this;
const args = arguments;
if (timer) {
clearTimeout(timer);
}
timer = setTimeout(function () {
timer = null;
fn.apply(th, args);
}, delays);
};
},
},
};
</script>
<style lang="scss">
#ScaleBox {
--scale: 1;
}
.ScaleBox {
position: absolute;
transform: scale(var(--scale)) translate(-50%, -50%);
display: flex;
flex-direction: column;
transform-origin: 0 0;
left: 50%;
top: 50%;
transition: 0.3s;
z-index: 999;
background: rgba(255, 0, 0, 0.3);
}
</style>
|