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uni_modules/wot-design-uni/components/composables/useParent.ts

@@ -0,0 +1,41 @@
+import {
+  ref,
+  inject,
+  computed,
+  onUnmounted,
+  type InjectionKey,
+  getCurrentInstance,
+  type ComponentPublicInstance,
+  type ComponentInternalInstance
+} from 'vue'
+
+type ParentProvide<T> = T & {
+  link(child: ComponentInternalInstance): void
+  unlink(child: ComponentInternalInstance): void
+  children: ComponentPublicInstance[]
+  internalChildren: ComponentInternalInstance[]
+}
+
+export function useParent<T>(key: InjectionKey<ParentProvide<T>>) {
+  const parent = inject(key, null)
+
+  if (parent) {
+    const instance = getCurrentInstance()!
+    const { link, unlink, internalChildren } = parent
+
+    link(instance)
+    onUnmounted(() => unlink(instance))
+
+    const index = computed(() => internalChildren.indexOf(instance))
+
+    return {
+      parent,
+      index
+    }
+  }
+
+  return {
+    parent: null,
+    index: ref(-1)
+  }
+}