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1.引言

在做数字大屏时，图表能跟着浏览器的尺寸自动变化，本文采用Vue3前端框架，采用TypeScript语言，封装了一个大屏自适应组件，将需要显示的图表放入组件的插槽中，就能实现自适应屏幕大小的效果。

2.实际效果

3.组件代码

/** * @ScaleScreen.vue * @author: zgr * @createTime: 2023/9/22 */<template><div class="screen-wrapper" ref="screenWrapper" :style="wrapperStyle"><slot></slot></div>
</template><script lang="ts" setup>
import { CSSProperties, PropType } from 'vue'
import { useFullscreen } from '@vueuse/core'
const { toggle } = useFullscreen()defineOptions({ name: 'ScaleScreen' })
interface IState {originalWidth: string | numberoriginalHeight: string | numberwidth?: string | numberheight?: string | numberobserver: null | MutationObserver
}
type IAutoScale =| boolean| {x?: booleany?: boolean}const props = defineProps({width: {type: [String, Number] as PropType<string | number>,default: 1920},height: {type: [String, Number] as PropType<string | number>,default: 1080},fullScreen: {type: Boolean as PropType<boolean>,default: false},autoScale: {type: [Object, Boolean] as PropType<IAutoScale>,default: true},delay: {type: Number as PropType<number>,default: 500},boxStyle: {type: Object as PropType<CSSProperties>,default: () => ({})},wrapperStyle: {type: Object as PropType<CSSProperties>,default: () => ({})},bodyOverflowHidden: {type: Boolean as PropType<boolean>,default: true}
})const state = reactive<IState>({currentWidth: 0,currentHeight: 0,originalWidth: 0,originalHeight: 0,observer: null
})
//ref
const screenWrapper = ref<HTMLElement>()//全屏函数
const toggleFullscreen = () => {toggle()
}
//按键F11全屏退出全屏
const KeyDown = (event: KeyboardEvent) => {if (event.code == 'F9') {toggleFullscreen()}
}const listenKeyDown = () => {window.addEventListener('keydown', KeyDown, true) //监听按键事件
}
const removeListenKeyDown = () => {window.removeEventListener('keydown', KeyDown, false) //监听按键事件
}let bodyOverflowHiddenStr: string
/*** 防抖函数* @param {Function} fn* @param {number} delay* @returns {() => void}*/
const debounce = (fn: Function, delay: number) => {let timer: NodeJS.Timeoutreturn function (...args: any[]): void {if (timer) {clearTimeout(timer)}timer = setTimeout(() => {typeof fn === 'function' && fn.apply(null, args)clearTimeout(timer)},delay > 0 ? delay : 100)}
}
const initBodyStyle = () => {if (props.bodyOverflowHidden) {bodyOverflowHiddenStr = document.body.style.overflowdocument.body.style.overflow = 'hidden'}
}
const initSize = () => {return new Promise((resolve) => {// console.log("初始化样式");nextTick(() => {// region 获取大屏真实尺寸if (props.width && props.height) {state.currentWidth = props.widthstate.currentHeight = props.height} else {state.currentWidth = screenWrapper.value?.clientWidthstate.currentHeight = screenWrapper.value?.clientHeight}// endregion// region 获取画布尺寸if (!state.originalHeight || !state.originalWidth) {state.originalWidth = window.screen.widthstate.originalHeight = window.screen.height}// endregionresolve()})})
}
const updateSize = () => {if (state.width && state.height) {screenWrapper.value!.style.width = `${state.width}px`screenWrapper.value!.style.height = `${state.height}px`} else {screenWrapper.value!.style.width = `${state.originalWidth}px`screenWrapper.value!.style.height = `${state.originalHeight}px`}
}
const autoScale = (scale: number) => {if (!props.autoScale) returnconst domWidth = screenWrapper.value!.clientWidthconst domHeight = screenWrapper.value!.clientHeightconst currentWidth = document.body.clientWidthconst currentHeight = document.body.clientHeightscreenWrapper.value!.style.transform = `scale(${scale},${scale})`let mx = Math.max((currentWidth - domWidth * scale) / 2, 0)let my = Math.max((currentHeight - domHeight * scale) / 2, 0)if (typeof props.autoScale === 'object') {!props.autoScale.x && (mx = 0)!props.autoScale.y && (my = 0)}screenWrapper.value!.style.margin = `${my}px ${mx}px`
}
const updateScale = () => {// 获取真实视口尺寸const currentWidth = document.body.clientWidthconst currentHeight = document.body.clientHeight// 获取大屏最终的宽高const realWidth = state.width || state.originalWidthconst realHeight = state.height || state.originalHeight// 计算缩放比例const widthScale = currentWidth / +realWidthconst heightScale = currentHeight / +realHeight// 若要铺满全屏，则按照各自比例缩放if (props.fullScreen) {screenWrapper.value!.style.transform = `scale(${widthScale},${heightScale})`return false}// 按照宽高最小比例进行缩放const scale = Math.min(widthScale, heightScale)autoScale(scale)
}const onResize = debounce(async () => {await initSize()updateSize()updateScale()
}, props.delay)const initMutationObserver = () => {const observer = (state.observer = new MutationObserver(() => {onResize()}))observer.observe(screenWrapper.value!, {attributes: true,attributeFilter: ['style'],attributeOldValue: true})
}
//设置数字大屏背景颜色为黑色
const setBgColor = () => {document.getElementsByTagName('body')[0].setAttribute('style', 'background: black')
}onMounted(() => {setBgColor()initBodyStyle()nextTick(async () => {await initSize()updateSize()updateScale()window.addEventListener('resize', onResize)initMutationObserver()})listenKeyDown()
})onBeforeUnmount(() => {window.removeEventListener('resize', onResize)removeListenKeyDown()state.observer?.disconnect()if (props.bodyOverflowHidden) {document.body.style.overflow = bodyOverflowHiddenStr}
})
</script><style scoped lang="scss">
.screen-wrapper {transition-property: all;transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);transition-duration: 500ms;position: relative;overflow: hidden;z-index: 100;transform-origin: left top;
}
</style>

4.感谢

1.GitHub - Alfred-Skyblue/v-scale-screen: Vue large screen adaptive component vue大屏自适应组件

2.koi-screen-plus: vue3版本数据大屏模板

3.DataV - Vue3 | DataV - Vue3