小程序npm和node模块

node_modules/@vant/weapp/dist/mixins/transition.js

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+// @ts-nocheck
+import { requestAnimationFrame } from '../common/utils';
+import { isObj } from '../common/validator';
+const getClassNames = (name) => ({
+    enter: `van-${name}-enter van-${name}-enter-active enter-class enter-active-class`,
+    'enter-to': `van-${name}-enter-to van-${name}-enter-active enter-to-class enter-active-class`,
+    leave: `van-${name}-leave van-${name}-leave-active leave-class leave-active-class`,
+    'leave-to': `van-${name}-leave-to van-${name}-leave-active leave-to-class leave-active-class`,
+});
+export function transition(showDefaultValue) {
+    return Behavior({
+        properties: {
+            customStyle: String,
+            // @ts-ignore
+            show: {
+                type: Boolean,
+                value: showDefaultValue,
+                observer: 'observeShow',
+            },
+            // @ts-ignore
+            duration: {
+                type: null,
+                value: 300,
+                observer: 'observeDuration',
+            },
+            name: {
+                type: String,
+                value: 'fade',
+            },
+        },
+        data: {
+            type: '',
+            inited: false,
+            display: false,
+        },
+        ready() {
+            if (this.data.show === true) {
+                this.observeShow(true, false);
+            }
+        },
+        methods: {
+            observeShow(value, old) {
+                if (value === old) {
+                    return;
+                }
+                value ? this.enter() : this.leave();
+            },
+            enter() {
+                if (this.enterFinishedPromise)
+                    return;
+                this.enterFinishedPromise = new Promise((resolve) => {
+                    const { duration, name } = this.data;
+                    const classNames = getClassNames(name);
+                    const currentDuration = isObj(duration) ? duration.enter : duration;
+                    if (this.status === 'enter') {
+                        return;
+                    }
+                    this.status = 'enter';
+                    this.$emit('before-enter');
+                    requestAnimationFrame(() => {
+                        if (this.status !== 'enter') {
+                            return;
+                        }
+                        this.$emit('enter');
+                        this.setData({
+                            inited: true,
+                            display: true,
+                            classes: classNames.enter,
+                            currentDuration,
+                        });
+                        requestAnimationFrame(() => {
+                            if (this.status !== 'enter') {
+                                return;
+                            }
+                            this.transitionEnded = false;
+                            this.setData({ classes: classNames['enter-to'] });
+                            resolve();
+                        });
+                    });
+                });
+            },
+            leave() {
+                if (!this.enterFinishedPromise)
+                    return;
+                this.enterFinishedPromise.then(() => {
+                    if (!this.data.display) {
+                        return;
+                    }
+                    const { duration, name } = this.data;
+                    const classNames = getClassNames(name);
+                    const currentDuration = isObj(duration) ? duration.leave : duration;
+                    this.status = 'leave';
+                    this.$emit('before-leave');
+                    requestAnimationFrame(() => {
+                        if (this.status !== 'leave') {
+                            return;
+                        }
+                        this.$emit('leave');
+                        this.setData({
+                            classes: classNames.leave,
+                            currentDuration,
+                        });
+                        requestAnimationFrame(() => {
+                            if (this.status !== 'leave') {
+                                return;
+                            }
+                            this.transitionEnded = false;
+                            setTimeout(() => {
+                                this.onTransitionEnd();
+                                this.enterFinishedPromise = null;
+                            }, currentDuration);
+                            this.setData({ classes: classNames['leave-to'] });
+                        });
+                    });
+                });
+            },
+            onTransitionEnd() {
+                if (this.transitionEnded) {
+                    return;
+                }
+                this.transitionEnded = true;
+                this.$emit(`after-${this.status}`);
+                const { show, display } = this.data;
+                if (!show && display) {
+                    this.setData({ display: false });
+                }
+            },
+        },
+    });
+}