52 lines
1.5 KiB
TypeScript
52 lines
1.5 KiB
TypeScript
import type { Ref, UnwrapRef } from 'vue';
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import { toRaw } from 'vue';
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import { watchEffect } from 'vue';
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import { unref } from 'vue';
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import { watch } from 'vue';
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import { ref } from 'vue';
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export default function useMergedState<T, R = Ref<T>>(
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defaultStateValue: T | (() => T),
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option?: {
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defaultValue?: T | (() => T);
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value?: Ref<T> | Ref<UnwrapRef<T>>;
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onChange?: (val: T, prevValue: T) => void;
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postState?: (val: T) => T;
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},
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): [R, (val: T) => void] {
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const { defaultValue, value = ref() } = option || {};
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let initValue: T =
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typeof defaultStateValue === 'function' ? (defaultStateValue as any)() : defaultStateValue;
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if (value.value !== undefined) {
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initValue = unref(value as any) as T;
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}
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if (defaultValue !== undefined) {
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initValue = typeof defaultValue === 'function' ? (defaultValue as any)() : defaultValue;
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}
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const innerValue = ref(initValue) as Ref<T>;
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const mergedValue = ref(initValue) as Ref<T>;
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watchEffect(() => {
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let val = value.value !== undefined ? value.value : innerValue.value;
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if (option.postState) {
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val = option.postState(val as T);
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}
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mergedValue.value = val as T;
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});
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function triggerChange(newValue: T) {
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const preVal = mergedValue.value;
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innerValue.value = newValue;
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if (toRaw(mergedValue.value) !== newValue && option.onChange) {
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option.onChange(newValue, preVal);
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}
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}
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// Effect of reset value to `undefined`
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watch(value, () => {
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innerValue.value = value.value as T;
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});
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return [mergedValue as unknown as R, triggerChange];
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}
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