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src/components/affix/affix.vue 4.69 KB
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  <template>
      <div>
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          <div ref="point" :class="classes" :style="styles">
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              <slot></slot>
          </div>
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          <div v-show="slot" :style="slotStyle"></div>
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      </div>
  </template>
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  <script>
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      import { on, off } from '../../utils/dom';
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      const prefixCls = 'ivu-affix';
  
      function getScroll(target, top) {
          const prop = top ? 'pageYOffset' : 'pageXOffset';
          const method = top ? 'scrollTop' : 'scrollLeft';
  
          let ret = target[prop];
  
          if (typeof ret !== 'number') {
              ret = window.document.documentElement[method];
          }
  
          return ret;
      }
  
      function getOffset(element) {
          const rect = element.getBoundingClientRect();
  
          const scrollTop = getScroll(window, true);
          const scrollLeft = getScroll(window);
  
          const docEl = window.document.body;
          const clientTop = docEl.clientTop || 0;
          const clientLeft = docEl.clientLeft || 0;
  
          return {
              top: rect.top + scrollTop - clientTop,
              left: rect.left + scrollLeft - clientLeft
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          };
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      }
  
      export default {
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          name: 'Affix',
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          props: {
              offsetTop: {
                  type: Number,
                  default: 0
              },
              offsetBottom: {
                  type: Number
              }
          },
          data () {
              return {
                  affix: false,
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                  styles: {},
                  slot: false,
                  slotStyle: {}
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              };
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          },
          computed: {
              offsetType () {
                  let type = 'top';
                  if (this.offsetBottom >= 0) {
                      type = 'bottom';
                  }
  
                  return type;
              },
              classes () {
                  return [
                      {
                          [`${prefixCls}`]: this.affix
                      }
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                  ];
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              }
          },
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          mounted () {
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  //            window.addEventListener('scroll', this.handleScroll, false);
  //            window.addEventListener('resize', this.handleScroll, false);
              on(window, 'scroll', this.handleScroll);
              on(window, 'resize', this.handleScroll);
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              this.$nextTick(() => {
                  this.handleScroll();
              })
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          },
          beforeDestroy () {
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  //            window.removeEventListener('scroll', this.handleScroll, false);
  //            window.removeEventListener('resize', this.handleScroll, false);
              off(window, 'scroll', this.handleScroll);
              off(window, 'resize', this.handleScroll);
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          },
          methods: {
              handleScroll () {
                  const affix = this.affix;
                  const scrollTop = getScroll(window, true);
                  const elOffset = getOffset(this.$el);
                  const windowHeight = window.innerHeight;
                  const elHeight = this.$el.getElementsByTagName('div')[0].offsetHeight;
  
                  // Fixed Top
                  if ((elOffset.top - this.offsetTop) < scrollTop && this.offsetType == 'top' && !affix) {
                      this.affix = true;
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                      this.slotStyle = {
                          width: this.$refs.point.clientWidth + 'px',
                          height: this.$refs.point.clientHeight + 'px'
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                      };
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                      this.slot = true;
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                      this.styles = {
                          top: `${this.offsetTop}px`,
                          left: `${elOffset.left}px`,
                          width: `${this.$el.offsetWidth}px`
                      };
  
                      this.$emit('on-change', true);
                  } else if ((elOffset.top - this.offsetTop) > scrollTop && this.offsetType == 'top' && affix) {
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                      this.slot = false;
                      this.slotStyle = {};
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                      this.affix = false;
                      this.styles = null;
  
                      this.$emit('on-change', false);
                  }
  
                  // Fixed Bottom
                  if ((elOffset.top + this.offsetBottom + elHeight) > (scrollTop + windowHeight) && this.offsetType == 'bottom' && !affix) {
                      this.affix = true;
                      this.styles = {
                          bottom: `${this.offsetBottom}px`,
                          left: `${elOffset.left}px`,
                          width: `${this.$el.offsetWidth}px`
                      };
  
                      this.$emit('on-change', true);
                  } else if ((elOffset.top + this.offsetBottom + elHeight) < (scrollTop + windowHeight) && this.offsetType == 'bottom' && affix) {
                      this.affix = false;
                      this.styles = null;
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                      this.$emit('on-change', false);
                  }
              }
          }
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      };
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  </script>