<!--
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* @Author: wei
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* @description: 大屏自适应容器组件
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* @LastEditTime: 2022-09-09 16:42:40
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-->
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<template>
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<!-- <section class="screen-box" :style="boxStyle"> -->
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<div class="screen-wrapper" ref="screenWrapper" :style="wrapperStyle">
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<slot></slot>
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</div>
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<!-- </section> -->
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</template>
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<script>
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/**
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* 防抖函数
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* @param {T} fn
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* @param {number} delay
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* @return
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*/
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function debounce(fn, delay) {
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let timer = null;
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return function (...args) {
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timer = setTimeout(
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() => {
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typeof fn === "function" && fn.apply(null, args);
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clearTimeout(timer);
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},
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delay > 0 ? delay : 100
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);
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};
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}
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export default {
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name: "VScaleScreen",
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props: {
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width: {
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type: [String, Number],
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default: 1920,
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},
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height: {
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type: [String, Number],
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default: 1080,
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},
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fullScreen: {
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type: Boolean,
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default: false,
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},
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autoScale: {
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type: [Object, Boolean],
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default: true,
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},
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selfAdaption: {
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type: Boolean,
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default: true,
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},
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delay: {
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type: Number,
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default: 500,
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},
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boxStyle: {
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type: Object,
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default: () => ({}),
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},
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wrapperStyle: {
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type: Object,
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default: () => ({}),
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},
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},
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data() {
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return {
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currentWidth: 0,
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currentHeight: 0,
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originalWidth: 0,
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originalHeight: 0,
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onResize: null,
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observer: null,
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};
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},
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watch: {
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selfAdaption(val) {
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if (val) {
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this.resize();
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this.addListener();
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} else {
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this.clearListener();
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this.clearStyle();
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}
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},
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},
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computed: {
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screenWrapper() {
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return this.$refs["screenWrapper"];
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},
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},
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methods: {
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initSize() {
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return new Promise((resolve, reject) => {
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// console.log("初始化样式");
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//给父元素设置 overflow:hidden
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this.screenWrapper.parentNode.style.overflow = "hidden";
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this.screenWrapper.parentNode.scrollLeft = 0;
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this.screenWrapper.parentNode.scrollTop = 0;
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this.$nextTick(() => {
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// region 获取大屏真实尺寸
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if (this.width && this.height) {
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this.currentWidth = this.width;
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this.currentHeight = this.height;
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} else {
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this.currentWidth = this.screenWrapper.clientWidth;
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this.currentHeight = this.screenWrapper.clientHeight;
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}
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// endregion
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// region 获取画布尺寸
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if (!this.originalHeight || !this.originalWidth) {
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this.originalWidth = window.screen.width;
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this.originalHeight = window.screen.height;
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}
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// endregion
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resolve();
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});
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});
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},
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updateSize() {
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if (this.currentWidth && this.currentHeight) {
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this.screenWrapper.style.width = `${this.currentWidth}px`;
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this.screenWrapper.style.height = `${this.currentHeight}px`;
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} else {
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this.screenWrapper.style.width = `${this.originalWidth}px`;
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this.screenWrapper.style.height = `${this.originalHeight}px`;
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}
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},
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handleAutoScale(scale) {
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if (!this.autoScale) return;
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const screenWrapper = this.screenWrapper;
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const domWidth = screenWrapper.clientWidth;
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const domHeight = screenWrapper.clientHeight;
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const currentWidth = document.body.clientWidth;
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const currentHeight = document.body.clientHeight;
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screenWrapper.style.transform = `scale(${scale},${scale}) `;
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let mx = Math.max((currentWidth - domWidth * scale) / 2, 0);
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let my = Math.max((currentHeight - domHeight * scale) / 2, 0);
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if (typeof this.autoScale === "object") {
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// @ts-ignore
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!this.autoScale.x && (mx = 0);
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// @ts-ignore
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!this.autoScale.y && (my = 0);
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}
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// console.log({
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// mx,
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// my,
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// currentWidth,
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// currentHeight,
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// domWidth,
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// domHeight,
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// scale,
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// });
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this.screenWrapper.style.margin = `${my}px ${mx}px`;
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},
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updateScale() {
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const screenWrapper = this.screenWrapper;
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// 获取真实视口尺寸
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const currentWidth = document.body.clientWidth;
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const currentHeight = document.body.clientHeight;
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// 获取大屏最终的宽高onResize
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const realWidth = this.currentWidth || this.originalWidth;
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const realHeight = this.currentHeight || this.originalHeight;
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// 计算缩放比例
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const widthScale = currentWidth / realWidth;
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const heightScale = currentHeight / realHeight;
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// console.log({currentWidth, currentHeight,realWidth,realHeight});
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// 若要铺满全屏，则按照各自比例缩放
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if (this.fullScreen) {
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screenWrapper.style.transform = `scale(${widthScale},${heightScale})`;
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return false;
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}
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// 按照宽高最小比例进行缩放
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const scale = Math.min(widthScale, heightScale);
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this.handleAutoScale(scale);
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},
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initMutationObserver() {
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const screenWrapper = this.screenWrapper;
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const observer = (this.observer = new MutationObserver(() => {
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this.onResize();
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}));
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observer.observe(screenWrapper, {
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attributes: true,
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attributeFilter: ["style"],
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attributeOldValue: true,
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});
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},
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clearListener() {
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window.removeEventListener("resize", this.onResize);
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},
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addListener() {
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window.addEventListener("resize", this.onResize);
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},
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clearStyle() {
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// console.log("清除");
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const screenWrapper = this.screenWrapper;
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screenWrapper.parentNode.style.overflow = "auto";
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screenWrapper.style = "";
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},
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async resize() {
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if (!this.selfAdaption) {
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return;
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}
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await this.initSize();
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this.updateSize();
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this.updateScale();
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},
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},
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mounted() {
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this.onResize = debounce(() => {
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this.resize();
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}, this.delay);
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this.$nextTick(() => {
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if (this.selfAdaption) {
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this.resize();
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this.addListener();
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}
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});
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},
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beforeDestroy() {
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this.clearListener();
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// this.observer.disconnect()
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},
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};
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//
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</script>
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<style scoped>
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.screen-box {
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overflow: hidden;
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background-size: 100% 100%;
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background: #000;
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width: 100vw;
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height: 100vh;
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}
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.screen-wrapper {
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transition-property: all;
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transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
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transition-duration: 500ms;
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position: relative;
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overflow: hidden;
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z-index: 100;
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transform-origin: left top;
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}
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</style>
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