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121 lines
4.2 KiB
121 lines
4.2 KiB
4 years ago
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import { isObj } from '../common/utils';
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const getClassNames = (name) => ({
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enter: `van-${name}-enter van-${name}-enter-active enter-class enter-active-class`,
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'enter-to': `van-${name}-enter-to van-${name}-enter-active enter-to-class enter-active-class`,
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leave: `van-${name}-leave van-${name}-leave-active leave-class leave-active-class`,
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'leave-to': `van-${name}-leave-to van-${name}-leave-active leave-to-class leave-active-class`
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});
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const nextTick = () => new Promise(resolve => setTimeout(resolve, 1000 / 30));
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export const transition = function (showDefaultValue) {
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return Behavior({
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properties: {
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customStyle: String,
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// @ts-ignore
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show: {
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type: Boolean,
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value: showDefaultValue,
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observer: 'observeShow'
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},
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// @ts-ignore
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duration: {
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type: null,
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value: 300,
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observer: 'observeDuration'
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},
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name: {
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type: String,
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value: 'fade'
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}
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},
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data: {
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type: '',
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inited: false,
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display: false
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},
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attached() {
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if (this.data.show) {
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this.enter();
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}
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},
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methods: {
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observeShow(value) {
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value ? this.enter() : this.leave();
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},
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enter() {
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const { duration, name } = this.data;
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const classNames = getClassNames(name);
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const currentDuration = isObj(duration) ? duration.enter : duration;
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this.status = 'enter';
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this.$emit('before-enter');
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Promise.resolve()
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.then(nextTick)
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.then(() => {
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this.checkStatus('enter');
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this.$emit('enter');
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this.setData({
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inited: true,
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display: true,
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classes: classNames.enter,
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currentDuration
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});
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})
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.then(nextTick)
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.then(() => {
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this.checkStatus('enter');
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this.transitionEnded = false;
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this.setData({
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classes: classNames['enter-to']
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});
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})
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.catch(() => { });
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},
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leave() {
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if (!this.data.display) {
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return;
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}
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const { duration, name } = this.data;
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const classNames = getClassNames(name);
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const currentDuration = isObj(duration) ? duration.leave : duration;
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this.status = 'leave';
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this.$emit('before-leave');
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Promise.resolve()
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.then(nextTick)
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.then(() => {
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this.checkStatus('leave');
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this.$emit('leave');
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this.setData({
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classes: classNames.leave,
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currentDuration
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});
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})
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.then(nextTick)
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.then(() => {
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this.checkStatus('leave');
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this.transitionEnded = false;
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setTimeout(() => this.onTransitionEnd(), currentDuration);
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this.setData({
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classes: classNames['leave-to']
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});
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})
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.catch(() => { });
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},
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checkStatus(status) {
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if (status !== this.status) {
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throw new Error(`incongruent status: ${status}`);
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}
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},
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onTransitionEnd() {
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if (this.transitionEnded) {
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return;
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}
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this.transitionEnded = true;
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this.$emit(`after-${this.status}`);
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const { show, display } = this.data;
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if (!show && display) {
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this.setData({ display: false });
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}
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}
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}
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});
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};
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