import { ComputedRef, nextTick, Ref, ref, unref, watch } from 'vue';
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import { onMountedOrActivated } from '/@/hooks/core/onMountedOrActivated';
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import { useWindowSizeFn } from '/@/hooks/event/useWindowSizeFn';
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import { useLayoutHeight } from '/@/layouts/default/content/useContentViewHeight';
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import { getViewportOffset } from '/@/utils/domUtils';
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export interface CompensationHeight {
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// 使用 layout Footer 高度作为判断补偿高度的条件
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useLayoutFooter: boolean;
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// refs HTMLElement
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elements?: Ref[];
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}
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/**
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* 动态计算内容高度，根据锚点dom最下坐标到屏幕最下坐标，根据传入dom的高度、padding、margin等值进行动态计算
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* 最终获取合适的内容高度
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*
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* @param flag 用于开启计算的响应式标识
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* @param anchorRef 锚点组件 Ref<ElRef | ComponentRef>
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* @param subtractHeightRefs 待减去高度的组件列表 Ref<ElRef | ComponentRef>
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* @param substractSpaceRefs 待减去空闲空间(margins/paddings)的组件列表 Ref<ElRef | ComponentRef>
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* @param offsetHeightRef 计算偏移的响应式高度，计算高度时将直接减去此值
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* @returns 响应式高度
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*/
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export function useContentHeight(
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flag: ComputedRef<Boolean>,
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anchorRef: Ref,
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subtractHeightRefs: Ref[],
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substractSpaceRefs: Ref[],
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offsetHeightRef: Ref<number> = ref(0),
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) {
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const contentHeight: Ref<Nullable<number>> = ref(null);
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const { footerHeightRef: layoutFooterHeightRef } = useLayoutHeight();
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let compensationHeight: CompensationHeight = {
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useLayoutFooter: true,
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};
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const setCompensation = (params: CompensationHeight) => {
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compensationHeight = params;
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};
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function redoHeight() {
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nextTick(() => {
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calcContentHeight();
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});
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}
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function calcSubtractSpace(element: HTMLDivElement | null | undefined): number {
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let subtractHeight = 0;
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const ZERO_PX = '0px';
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let marginBottom = ZERO_PX;
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let marginTop = ZERO_PX;
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if (element) {
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const cssStyle = getComputedStyle(element);
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marginBottom = cssStyle?.marginBottom ?? ZERO_PX;
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marginTop = cssStyle?.marginTop ?? ZERO_PX;
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}
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if (marginBottom) {
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const contentMarginBottom = Number(marginBottom.replace(/[^\d]/g, ''));
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subtractHeight += contentMarginBottom;
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}
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if (marginTop) {
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const contentMarginTop = Number(marginTop.replace(/[^\d]/g, ''));
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subtractHeight += contentMarginTop;
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}
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return subtractHeight;
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}
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function getEl(element: any): Nullable<HTMLDivElement> {
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if (element == null) {
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return null;
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}
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return (element instanceof HTMLDivElement ? element : element.$el) as HTMLDivElement;
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}
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async function calcContentHeight() {
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if (!flag.value) {
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return;
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}
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// Add a delay to get the correct height
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await nextTick();
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const wrapperEl = getEl(unref(anchorRef));
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if (!wrapperEl) {
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return;
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}
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const { bottomIncludeBody } = getViewportOffset(wrapperEl);
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// substract elements height
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let substractHeight = 0;
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subtractHeightRefs.forEach((item) => {
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substractHeight += getEl(unref(item))?.offsetHeight ?? 0;
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});
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// subtract margins / paddings
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let substractSpaceHeight = 0;
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substractSpaceRefs.forEach((item) => {
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substractSpaceHeight += calcSubtractSpace(getEl(unref(item)));
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});
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let height =
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bottomIncludeBody -
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unref(layoutFooterHeightRef) -
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unref(offsetHeightRef) -
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substractHeight -
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substractSpaceHeight;
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// compensation height
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const calcCompensationHeight = () => {
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compensationHeight.elements?.forEach((item) => {
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height += getEl(unref(item))?.offsetHeight ?? 0;
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});
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};
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if (compensationHeight.useLayoutFooter && unref(layoutFooterHeightRef) > 0) {
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calcCompensationHeight();
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} else {
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calcCompensationHeight();
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}
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contentHeight.value = height;
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}
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onMountedOrActivated(() => {
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nextTick(() => {
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calcContentHeight();
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});
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});
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useWindowSizeFn(
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() => {
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calcContentHeight();
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},
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50,
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{ immediate: true },
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);
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watch(
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() => [layoutFooterHeightRef.value],
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() => {
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calcContentHeight();
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},
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{
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flush: 'post',
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immediate: true,
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},
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);
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return { redoHeight, setCompensation, contentHeight };
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}
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