blackteay/vant
1
0
Fork 0
mirror of https://gitee.com/vant-contrib/vant.git synced 2025-04-24 02:16:12 +08:00
Code Issues Projects Releases Wiki Activity

perf: reduce ref call

Browse Source
This commit is contained in:
chenjiahan 2020-08-25 15:33:59 +08:00
parent a00e6f3474
commit 04290db467
2 changed files with 7 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
src/action-bar-button/index.js
View File

@ -1,4 +1,4 @@
import { ref, computed } from 'vue';
import { computed } from 'vue';
import { createNamespace } from '../utils';
import { route, routeProps } from '../utils/router';
import { useParent } from '../api/use-relation';
@ -19,13 +19,13 @@ export default createComponent({
},
setup(props, { slots }) {
const { parent, index } = useParent(ACTION_BAR_KEY, ref(true));
const { parent, index } = useParent(ACTION_BAR_KEY, { isButton: true });
const isFirst = computed(() => {
if (parent) {
const children = parent.children.value;
const prev = children[index.value - 1];
return !(prev && prev.value);
return !(prev && prev.isButton);
}
});
@ -33,7 +33,7 @@ export default createComponent({
if (parent) {
const children = parent.children.value;
const next = children[index.value + 1];
return !(next && next.value);
return !(next && next.isButton);
}
});

9
src/api/use-relation.ts
View File

@ -1,13 +1,10 @@
import { ref, Ref, inject, computed, onUnmounted } from 'vue';
import { Ref, inject, computed, onUnmounted } from 'vue';
export type Parent<T = unknown> = null | {
children: Ref<Ref<T>[]>;
children: Ref<T[]>;
};
export function useParent<T = unknown>(
key: string,
child: Ref<T> = ref() as Ref<T>
) {
export function useParent<T = unknown>(key: string, child: T = {} as T) {
const parent = inject<Parent<T>>(key, null);
if (parent) {