users/uni_modules/uview-ui/components/u-transition/u-transition.vue

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<template>
<view
v-if="inited"
class="u-transition"
ref="u-transition"
@tap="clickHandler"
:class="classes"
:style="[mergeStyle]"
@touchmove="noop"
>
<slot />
</view>
</template>
<script>
import props from './props.js';
// 组件的methods方法由于内容较长写在外部文件中通过mixin引入
import transition from "./transition.js";
/**
* transition 动画组件
* @description
* @tutorial
* @property {String} show 是否展示组件 (默认 false
* @property {String} mode 使用的动画模式 (默认 'fade'
* @property {String | Number} duration 动画的执行时间单位ms (默认 '300'
* @property {String} timingFunction 使用的动画过渡函数 (默认 'ease-out'
* @property {Object} customStyle 自定义样式
* @event {Function} before-enter 进入前触发
* @event {Function} enter 进入中触发
* @event {Function} after-enter 进入后触发
* @event {Function} before-leave 离开前触发
* @event {Function} leave 离开中触发
* @event {Function} after-leave 离开后触发
* @example
*/
export default {
name: 'u-transition',
data() {
return {
inited: false, // 是否显示/隐藏组件
viewStyle: {}, // 组件内部的样式
status: '', // 记录组件动画的状态
transitionEnded: false, // 组件是否结束的标记
display: false, // 组件是否展示
classes: '', // 应用的类名
}
},
computed: {
mergeStyle() {
const { viewStyle, customStyle } = this
return {
// #ifndef APP-NVUE
transitionDuration: `${this.duration}ms`,
// display: `${this.display ? '' : 'none'}`,
transitionTimingFunction: this.timingFunction,
// #endif
// 避免自定义样式影响到动画属性所以写在viewStyle前面
...uni.$u.addStyle(customStyle),
...viewStyle
}
}
},
// 将mixin挂在到组件中uni.$u.mixin实际上为一个vue格式对象
mixins: [uni.$u.mpMixin, uni.$u.mixin, transition, props],
watch: {
show: {
handler(newVal) {
// vue和nvue分别执行不同的方法
// #ifdef APP-NVUE
newVal ? this.nvueEnter() : this.nvueLeave()
// #endif
// #ifndef APP-NVUE
newVal ? this.vueEnter() : this.vueLeave()
// #endif
},
// 表示同时监听初始化时的props的show的意思
immediate: true
}
}
}
</script>
<style lang="scss" scoped>
@import '../../libs/css/components.scss';
/* #ifndef APP-NVUE */
// vue版本动画相关的样式抽离在外部文件
@import './vue.ani-style.scss';
/* #endif */
.u-transition {}
</style>