popper.js
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/**
* https://github.com/freeze-component/vue-popper
* */
import Vue from 'vue';
const isServer = Vue.prototype.$isServer;
const Popper = isServer ? function() {} : require('popper.js'); // eslint-disable-line
export default {
props: {
placement: {
type: String,
default: 'bottom'
},
boundariesPadding: {
type: Number,
default: 5
},
reference: Object,
popper: Object,
offset: {
default: 0
},
value: {
type: Boolean,
default: false
},
transition: String,
options: {
type: Object,
default () {
return {
gpuAcceleration: false,
boundariesElement: 'body' // todo 暂时注释，发现在 vue 2 里方向暂时可以自动识别了，待验证(还是有问题的)
};
}
},
// visible: {
// type: Boolean,
// default: false
// }
},
data () {
return {
visible: this.value
};
},
watch: {
value: {
immediate: true,
handler(val) {
this.visible = val;
this.$emit('input', val);
}
},
visible(val) {
if (val) {
this.updatePopper();
} else {
this.destroyPopper();
this.$emit('on-popper-hide');
}
this.$emit('input', val);
}
},
methods: {
createPopper() {
if (isServer) return;
if (!/^(top|bottom|left|right)(-start|-end)?$/g.test(this.placement)) {
return;
}
const options = this.options;
const popper = this.popper || this.$refs.popper;
const reference = this.reference || this.$refs.reference;
if (!popper || !reference) return;
if (this.popperJS && this.popperJS.hasOwnProperty('destroy')) {
this.popperJS.destroy();
}
options.placement = this.placement;
options.offset = this.offset;
this.popperJS = new Popper(reference, popper, options);
this.popperJS.onCreate(popper => {
this.resetTransformOrigin(popper);
this.$nextTick(this.updatePopper);
this.$emit('created', this);
});
},
updatePopper() {
if (isServer) return;
this.popperJS ? this.popperJS.update() : this.createPopper();
},
doDestroy() {
if (isServer) return;
if (this.visible) return;
this.popperJS.destroy();
this.popperJS = null;
},
destroyPopper() {
if (isServer) return;
if (this.popperJS) {
this.resetTransformOrigin(this.popperJS);
}
},
resetTransformOrigin(popper) {
if (isServer) return;
let placementMap = {top: 'bottom', bottom: 'top', left: 'right', right: 'left'};
let placement = popper._popper.getAttribute('x-placement').split('-')[0];
let origin = placementMap[placement];
popper._popper.style.transformOrigin = ['top', 'bottom'].indexOf(placement) > -1 ? `center ${ origin }` : `${ origin } center`;
}
},
beforeDestroy() {
if (isServer) return;
if (this.popperJS) {
this.popperJS.destroy();
}
}
};