101 lines
2.7 KiB
TypeScript
101 lines
2.7 KiB
TypeScript
import { computed, watchEffect, watch } from 'vue';
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import type { Ref } from 'vue';
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import { isInViewPort } from '../util';
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import type { TourStepInfo } from '..';
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import useState from '../../_util/hooks/useState';
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export interface Gap {
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offset?: number;
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radius?: number;
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}
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export interface PosInfo {
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left: number;
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top: number;
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height: number;
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width: number;
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radius: number;
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}
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export default function useTarget(
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target: Ref<TourStepInfo['target']>,
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open: Ref<boolean>,
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gap?: Ref<Gap>,
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scrollIntoViewOptions?: Ref<boolean | ScrollIntoViewOptions>,
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): [Ref<PosInfo>, Ref<HTMLElement>] {
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// ========================= Target =========================
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// We trade `undefined` as not get target by function yet.
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// `null` as empty target.
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const [targetElement, setTargetElement] = useState<null | HTMLElement | undefined>(undefined);
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watchEffect(() => {
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const nextElement = typeof target.value === 'function' ? (target.value as any)() : target.value;
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setTargetElement(nextElement || null);
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});
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// ========================= Align ==========================
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const [posInfo, setPosInfo] = useState<PosInfo>(null);
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const updatePos = () => {
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if (targetElement.value) {
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// Exist target element. We should scroll and get target position
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if (!isInViewPort(targetElement.value) && open.value) {
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targetElement.value.scrollIntoView(scrollIntoViewOptions.value);
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}
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const { left, top, width, height } = targetElement.value.getBoundingClientRect();
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const nextPosInfo: PosInfo = { left, top, width, height, radius: 0 };
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setPosInfo(nextPosInfo);
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} else {
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// Not exist target which means we just show in center
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setPosInfo(null);
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}
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};
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watchEffect(() => {
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updatePos();
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// update when window resize
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window.addEventListener('resize', updatePos);
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return () => {
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window.removeEventListener('resize', updatePos);
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};
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});
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watch(
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open,
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val => {
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updatePos();
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// update when window resize
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if (val) {
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window.addEventListener('resize', updatePos);
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} else {
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window.removeEventListener('resize', updatePos);
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}
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},
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{ immediate: true },
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);
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// ======================== PosInfo =========================
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const mergedPosInfo = computed(() => {
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if (!posInfo.value) {
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return posInfo.value;
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}
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const gapOffset = gap.value?.offset || 6;
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const gapRadius = gap.value?.radius || 2;
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return {
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left: posInfo.value.left - gapOffset,
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top: posInfo.value.top - gapOffset,
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width: posInfo.value.width + gapOffset * 2,
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height: posInfo.value.height + gapOffset * 2,
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radius: gapRadius,
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};
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});
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return [mergedPosInfo, targetElement];
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}
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