<template>
    <div v-bind:style="styleObject" class="scale-box">
        <slot></slot>
    </div>
</template>

<script setup>
import debounce from "lodash/debounce";
import { computed, reactive } from "vue";
let that = reactive({
    width: 1920,
    height: 1080,
    scaleX: null,
    scaleY: null,
});
let styleObject = computed(() => {
    let obj = {
        transform: `scale(${that.scaleX},${that.scaleY}) translate(-50%, -50%)`,
        WebkitTransform: `scale(${that.scaleX},${that.scaleY}) translate(-50%, -50%)`,
        width: that.width + "px",
        height: that.height + "px",
    };
    return obj;
});

const getScale = () => {
    // 分别计算X轴和Y轴的缩放比例
    that.scaleX = window.innerWidth / that.width;
    that.scaleY = window.innerHeight / that.height;
};

const setScale = debounce(() => {
    // 获取到缩放比，设置它
    getScale();
}, 500);

onMounted(() => {
    getScale();
    window.addEventListener("resize", setScale);
});

onUnmounted(() => {
    window.addEventListener("resize", setScale);
});
</script>

<style lang="scss" scoped>
.scale-box {
    transform-origin: 0 0;
    position: absolute;
    left: 50%;
    top: 50%;
    transition: 0.3s;
}
</style>