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src/components/select/dropdown.vue 2.11 KB
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e355dd49   梁灏   add Select Component 
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  <template>
      <div class="ivu-select-dropdown"><slot></slot></div>
  </template>
  <script>
      import Popper from 'popper.js';
  
      export default {
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          props: {
              placement: {
                  type: String,
                  default: 'bottom-start'
              }
          },
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          data () {
              return {
                  popper: null
              }
          },
          methods: {
              update () {
                  if (this.popper) {
                      this.$nextTick(() => {
                          this.popper.update();
                      });
                  } else {
                      this.$nextTick(() => {
                          this.popper = new Popper(this.$parent.$els.reference, this.$el, {
                              gpuAcceleration: false,
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                              placement: this.placement,
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                              boundariesPadding: 0,
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                              forceAbsolute: true,
                              boundariesElement: 'body'
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                          });
                          this.popper.onCreate(popper => {
                              this.resetTransformOrigin(popper);
                          });
                      });
                  }
              },
              destroy () {
                  if (this.popper) {
                      this.resetTransformOrigin(this.popper);
                      setTimeout(() => {
                          this.popper.destroy();
                          this.popper = null;
                      }, 300);
                  }
              },
              resetTransformOrigin(popper) {
                  let placementMap = {top: 'bottom', bottom: 'top'};
                  let placement = popper._popper.getAttribute('x-placement').split('-')[0];
                  let origin = placementMap[placement];
                  popper._popper.style.transformOrigin = `center ${ origin }`;
              }
          },
          ready () {
              this.$on('on-update-popper', this.update);
              this.$on('on-destroy-popper', this.destroy);
          },
          beforeDestroy () {
              if (this.popper) {
                  this.popper.destroy();
              }
          }
      }
  </script>