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packages/scrollbar/index.js

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+import Scrollbar from './src/main';
+
+/* istanbul ignore next */
+Scrollbar.install = function(Vue) {
+  Vue.component(Scrollbar.name, Scrollbar);
+};
+
+export default Scrollbar;

packages/scrollbar/src/bar.js

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+import { on, off } from 'element-ui/src/utils/dom';
+import { renderThumbStyle, BAR_MAP } from './util';
+
+/* istanbul ignore next */
+export default {
+  name: 'Bar',
+
+  props: {
+    vertical: Boolean,
+    size: String,
+    move: Number
+  },
+
+  computed: {
+    bar() {
+      return BAR_MAP[this.vertical ? 'vertical' : 'horizontal'];
+    },
+
+    wrap() {
+      return this.$parent.wrap;
+    }
+  },
+
+  render(h) {
+    const { size, move, bar } = this;
+
+    return (
+      <div
+        class={ ['el-scrollbar__bar', 'is-' + bar.key] }
+        onMousedown={ this.clickTrackHandler } >
+        <div
+          ref="thumb"
+          class="el-scrollbar__thumb"
+          onMousedown={ this.clickThumbHandler }
+          style={ renderThumbStyle({ size, move, bar }) }>
+        </div>
+      </div>
+    );
+  },
+
+  methods: {
+    clickThumbHandler(e) {
+      // prevent click event of right button
+      if (e.ctrlKey || e.button === 2) {
+        return;
+      }
+      this.startDrag(e);
+      this[this.bar.axis] = (e.currentTarget[this.bar.offset] - (e[this.bar.client] - e.currentTarget.getBoundingClientRect()[this.bar.direction]));
+    },
+
+    clickTrackHandler(e) {
+      const offset = Math.abs(e.target.getBoundingClientRect()[this.bar.direction] - e[this.bar.client]);
+      const thumbHalf = (this.$refs.thumb[this.bar.offset] / 2);
+      const thumbPositionPercentage = ((offset - thumbHalf) * 100 / this.$el[this.bar.offset]);
+
+      this.wrap[this.bar.scroll] = (thumbPositionPercentage * this.wrap[this.bar.scrollSize] / 100);
+    },
+
+    startDrag(e) {
+      e.stopImmediatePropagation();
+      this.cursorDown = true;
+
+      on(document, 'mousemove', this.mouseMoveDocumentHandler);
+      on(document, 'mouseup', this.mouseUpDocumentHandler);
+      document.onselectstart = () => false;
+    },
+
+    mouseMoveDocumentHandler(e) {
+      if (this.cursorDown === false) return;
+      const prevPage = this[this.bar.axis];
+
+      if (!prevPage) return;
+
+      const offset = ((this.$el.getBoundingClientRect()[this.bar.direction] - e[this.bar.client]) * -1);
+      const thumbClickPosition = (this.$refs.thumb[this.bar.offset] - prevPage);
+      const thumbPositionPercentage = ((offset - thumbClickPosition) * 100 / this.$el[this.bar.offset]);
+
+      this.wrap[this.bar.scroll] = (thumbPositionPercentage * this.wrap[this.bar.scrollSize] / 100);
+    },
+
+    mouseUpDocumentHandler(e) {
+      this.cursorDown = false;
+      this[this.bar.axis] = 0;
+      off(document, 'mousemove', this.mouseMoveDocumentHandler);
+      document.onselectstart = null;
+    }
+  },
+
+  destroyed() {
+    off(document, 'mouseup', this.mouseUpDocumentHandler);
+  }
+};

packages/scrollbar/src/main.js

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+// reference https://github.com/noeldelgado/gemini-scrollbar/blob/master/index.js
+
+import { addResizeListener, removeResizeListener } from 'element-ui/src/utils/resize-event';
+import scrollbarWidth from 'element-ui/src/utils/scrollbar-width';
+import { toObject } from 'element-ui/src/utils/util';
+import Bar from './bar';
+
+/* istanbul ignore next */
+export default {
+  name: 'ElScrollbar',
+
+  components: { Bar },
+
+  props: {
+    native: Boolean,
+    wrapStyle: {},
+    wrapClass: {},
+    viewClass: {},
+    viewStyle: {},
+    noresize: Boolean, // 如果 container 尺寸不会发生变化，最好设置它可以优化性能
+    tag: {
+      type: String,
+      default: 'div'
+    }
+  },
+
+  data() {
+    return {
+      sizeWidth: '0',
+      sizeHeight: '0',
+      moveX: 0,
+      moveY: 0
+    };
+  },
+
+  computed: {
+    wrap() {
+      return this.$refs.wrap;
+    }
+  },
+
+  render(h) {
+    let gutter = scrollbarWidth();
+    let style = this.wrapStyle;
+
+    if (gutter) {
+      const gutterWith = `-${gutter}px`;
+      const gutterStyle = `margin-bottom: ${gutterWith}; margin-right: ${gutterWith};`;
+
+      if (Array.isArray(this.wrapStyle)) {
+        style = toObject(this.wrapStyle);
+        style.marginRight = style.marginBottom = gutterWith;
+      } else if (typeof this.wrapStyle === 'string') {
+        style += gutterStyle;
+      } else {
+        style = gutterStyle;
+      }
+    }
+    const view = h(this.tag, {
+      class: ['el-scrollbar__view', this.viewClass],
+      style: this.viewStyle,
+      ref: 'resize'
+    }, this.$slots.default);
+    const wrap = (
+      <div
+        ref="wrap"
+        style={ style }
+        onScroll={ this.handleScroll }
+        class={ [this.wrapClass, 'el-scrollbar__wrap', gutter ? '' : 'el-scrollbar__wrap--hidden-default'] }>
+        { [view] }
+      </div>
+    );
+    let nodes;
+
+    if (!this.native) {
+      nodes = ([
+        wrap,
+        <Bar
+          move={ this.moveX }
+          size={ this.sizeWidth }></Bar>,
+        <Bar
+          vertical
+          move={ this.moveY }
+          size={ this.sizeHeight }></Bar>
+      ]);
+    } else {
+      nodes = ([
+        <div
+          ref="wrap"
+          class={ [this.wrapClass, 'el-scrollbar__wrap'] }
+          style={ style }>
+          { [view] }
+        </div>
+      ]);
+    }
+    return h('div', { class: 'el-scrollbar' }, nodes);
+  },
+
+  methods: {
+    handleScroll() {
+      const wrap = this.wrap;
+
+      this.moveY = ((wrap.scrollTop * 100) / wrap.clientHeight);
+      this.moveX = ((wrap.scrollLeft * 100) / wrap.clientWidth);
+    },
+
+    update() {
+      let heightPercentage, widthPercentage;
+      const wrap = this.wrap;
+      if (!wrap) return;
+
+      heightPercentage = (wrap.clientHeight * 100 / wrap.scrollHeight);
+      widthPercentage = (wrap.clientWidth * 100 / wrap.scrollWidth);
+
+      this.sizeHeight = (heightPercentage < 100) ? (heightPercentage + '%') : '';
+      this.sizeWidth = (widthPercentage < 100) ? (widthPercentage + '%') : '';
+    }
+  },
+
+  mounted() {
+    if (this.native) return;
+    this.$nextTick(this.update);
+    !this.noresize && addResizeListener(this.$refs.resize, this.update);
+  },
+
+  beforeDestroy() {
+    if (this.native) return;
+    !this.noresize && removeResizeListener(this.$refs.resize, this.update);
+  }
+};

packages/scrollbar/src/util.js

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+export const BAR_MAP = {
+  vertical: {
+    offset: 'offsetHeight',
+    scroll: 'scrollTop',
+    scrollSize: 'scrollHeight',
+    size: 'height',
+    key: 'vertical',
+    axis: 'Y',
+    client: 'clientY',
+    direction: 'top'
+  },
+  horizontal: {
+    offset: 'offsetWidth',
+    scroll: 'scrollLeft',
+    scrollSize: 'scrollWidth',
+    size: 'width',
+    key: 'horizontal',
+    axis: 'X',
+    client: 'clientX',
+    direction: 'left'
+  }
+};
+
+export function renderThumbStyle({ move, size, bar }) {
+  const style = {};
+  const translate = `translate${bar.axis}(${ move }%)`;
+
+  style[bar.size] = size;
+  style.transform = translate;
+  style.msTransform = translate;
+  style.webkitTransform = translate;
+
+  return style;
+};