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src/wxcomponents/vant/mixins/transition.js
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import { isObj } from '../common/utils';
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`
});
const nextTick = () => new Promise(resolve => setTimeout(resolve, 1000 / 30));
export const transition = function (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
},
attached() {
if (this.data.show) {
this.enter();
}
},
methods: {
observeShow(value) {
value ? this.enter() : this.leave();
},
enter() {
const { duration, name } = this.data;
const classNames = getClassNames(name);
const currentDuration = isObj(duration) ? duration.enter : duration;
this.status = 'enter';
this.$emit('before-enter');
Promise.resolve()
.then(nextTick)
.then(() => {
this.checkStatus('enter');
this.$emit('enter');
this.setData({
inited: true,
display: true,
classes: classNames.enter,
currentDuration
});
})
.then(nextTick)
.then(() => {
this.checkStatus('enter');
this.transitionEnded = false;
this.setData({
classes: classNames['enter-to']
});
})
.catch(() => { });
},
leave() {
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.$emit('before-leave');
Promise.resolve()
.then(nextTick)
.then(() => {
this.checkStatus('leave');
this.$emit('leave');
this.setData({
classes: classNames.leave,
currentDuration
});
})
.then(nextTick)
.then(() => {
this.checkStatus('leave');
this.transitionEnded = false;
setTimeout(() => this.onTransitionEnd(), currentDuration);
this.setData({
classes: classNames['leave-to']
});
})
.catch(() => { });
},
checkStatus(status) {
if (status !== this.status) {
throw new Error(`incongruent status: ${status}`);
}
},
onTransitionEnd() {
if (this.transitionEnded) {
return;
}
this.transitionEnded = true;
this.$emit(`after-${this.status}`);
const { show, display } = this.data;
if (!show && display) {
this.setData({ display: false });
}
}
}
});
};
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