use -webkit-line-clamp & remove cover mode

src/components/Ellipsis/demo/cover.md

----
-order: 2
-title: 按照行数省略的覆盖后缀模式
----
-
-通过设置 `lines` 属性指定最大行数，如果超过这个行数的文本会自动截取。通过设置 `cover` 属性设置后缀的覆盖模式，在这种模式下可以在 `children` 中使用 `ReactNode`。
-
-但是因为是覆盖形式的后缀，可能需要通过 `suffixOffset` 以及 `suffixColor` 来设置 `...` 的样式以修正。
-
-````jsx
-import Ellipsis from 'ant-design-pro/lib/Ellipsis';
-
-const article = <p>There were injuries alleged in three <a href="#cover">cases in 2015</a>, and a fourth incident in September, according to the safety recall report. After meeting with US regulators in October, the firm decided to issue a voluntary recall.</p>;
-
-ReactDOM.render(
-  <div style={{ width: 200 }}>
-    <Ellipsis lines={3} cover>{article}</Ellipsis>
-    <h4 style={{ marginTop: 24 }}>Using SuffixOffset</h4>
-    <Ellipsis lines={3} cover suffixOffset={4}>{article}</Ellipsis>
-  </div>
-, mountNode);
-````

src/components/Ellipsis/demo/line.md

@@ -14,7 +14,7 @@ const article = <p>There were injuries alleged in three <a href="#cover">cases i
 
 ReactDOM.render(
   <div style={{ width: 200 }}>
-    <Ellipsis lines={3}>{article}</Ellipsis>
+    <Ellipsis tooltip lines={3}>{article}</Ellipsis>
   </div>
 , mountNode);
 ````

src/components/Ellipsis/index.js

@@ -6,6 +6,8 @@ import styles from './index.less';
 /* eslint react/no-did-mount-set-state: 0 */
 /* eslint no-param-reassign: 0 */
 
+const isSupportLineClamp = (document.body.style.webkitLineClamp !== undefined);
+
 const EllipsisText = ({ text, length, tooltip, ...other }) => {
   if (typeof text !== 'string') {
     throw new Error('Ellipsis children must be string.');
@@ -22,7 +24,7 @@ const EllipsisText = ({ text, length, tooltip, ...other }) => {
   }
 
   if (tooltip) {
-    return <span>{displayText}<Tooltip title={text}>{tail}</Tooltip></span>;
+    return <Tooltip title={text}><span>{displayText}{tail}</span></Tooltip>;
   }
 
   return (
@@ -34,35 +36,25 @@ const EllipsisText = ({ text, length, tooltip, ...other }) => {
 
 export default class Ellipsis extends Component {
   state = {
-    lineHeight: 0,
     text: '',
     targetCount: 0,
   }
 
   componentDidMount() {
-    const { lines, cover } = this.props;
     if (this.node) {
-      if (lines && cover) {
-        this.setState({
-          lineHeight: parseInt(window.getComputedStyle(this.node).lineHeight, 10),
-        });
-      }
       this.computeLine();
     }
   }
 
   componentWillReceiveProps(nextProps) {
-    if (this.props.lines !== nextProps.lines || this.props.cover !== nextProps.cover) {
-      this.setState({
-        lineHeight: parseInt(window.getComputedStyle(this.node).lineHeight, 10),
-      });
+    if (this.props.lines !== nextProps.lines) {
       this.computeLine();
     }
   }
 
   computeLine = () => {
-    const { lines, cover } = this.props;
-    if (lines && !cover) {
+    const { lines } = this.props;
+    if (lines && !isSupportLineClamp) {
       const fontSize = parseInt(window.getComputedStyle(this.node).fontSize, 10) || 14;
       const text = this.shadowChildren.innerText;
       const targetWidth = (this.node.offsetWidth || this.node.parentNode.offsetWidth) * lines;
@@ -128,22 +120,20 @@ export default class Ellipsis extends Component {
   }
 
   render() {
-    const { text, targetCount, lineHeight } = this.state;
+    const { text, targetCount } = this.state;
     const {
       children,
       lines,
       length,
-      cover = false,
-      suffixColor = '#fff',
-      suffixOffset = 0,
       className,
       tooltip,
       ...restProps
     } = this.props;
 
+
     const cls = classNames(styles.ellipsis, className, {
-      [styles.lines]: (lines && !cover),
-      [styles.linesCover]: (lines && cover),
+      [styles.lines]: (lines && !isSupportLineClamp),
+      [styles.lineClamp]: (lines && isSupportLineClamp),
     });
 
     if (!lines && !length) {
@@ -155,29 +145,30 @@ export default class Ellipsis extends Component {
       return (<EllipsisText className={cls} length={length} text={children || ''} tooltip={tooltip} {...restProps} />);
     }
 
-    // lines cover
-    if (cover) {
-      const id = `antd-pro-ellipsis-${`${new Date().getTime()}${Math.floor(Math.random() * 100)}`}`;
-      const style = `#${id}:before{background-color:${suffixColor};padding-left:${suffixOffset}px;}`;
+    const id = `antd-pro-ellipsis-${`${new Date().getTime()}${Math.floor(Math.random() * 100)}`}`;
+
+    // support document.body.style.webkitLineClamp
+    if (isSupportLineClamp) {
+      const style = `#${id}{-webkit-line-clamp:${lines};}`;
       return (
-        <div
-          {...restProps}
-          id={id}
-          ref={this.handleRef}
-          className={cls}
-          style={{
-          ...restProps.style,
-          maxHeight: `${lines * lineHeight}px`,
-        }}
-        >
+        <div id={id} className={cls} {...restProps}>
           <style>{style}</style>
-          {children}
-        </div>
-      );
+          {
+            tooltip ? (<Tooltip title={text}>{children}</Tooltip>) : children
+          }
+        </div>);
     }
 
-    // lines no cover
-    const suffix = tooltip ? <Tooltip title={text}>...</Tooltip> : '...';
+    const childNode = (
+      <span>
+        {
+          (targetCount > 0) && text.substring(0, targetCount)
+        }
+        {
+          (targetCount > 0) && (targetCount < text.length) && '...'
+        }
+      </span>
+    );
 
     return (
       <div
@@ -186,10 +177,9 @@ export default class Ellipsis extends Component {
         className={cls}
       >
         {
-          (targetCount > 0) && text.substring(0, targetCount)
-        }
-        {
-          (targetCount > 0) && (targetCount < text.length) && suffix
+          tooltip ? (
+            <Tooltip title={text}>{childNode}</Tooltip>
+          ) : childNode
         }
         <div className={styles.shadow} ref={this.handleShadowChildren}>{children}</div>
         <div className={styles.shadow} ref={this.handleShadow}><span>{text}</span></div>

src/components/Ellipsis/index.less

-.textOverflowMulti(@line: 3, @bg: #fff) {
-  overflow: hidden;
-  position: relative;
-  line-height: 1.5em;
-  max-height: @line * 1.5em;
-  text-align: justify;
-  margin-right: -1em;
-  padding-right: 1em;
-  &:before {
-    background: @bg;
-    box-shadow: 2px 0 2px 1px rgba(255, 255, 255, 0.2);
-    content: '...';
-    padding-left: 0;
-    position: absolute;
-    right: 14px;
-    bottom: 0;
-  }
-  &:after {
-    background: white;
-    content: '';
-    margin-top: 0.2em;
-    position: absolute;
-    right: 14px;
-    width: 1em;
-    height: 1em;
-  }
-}
-
 .ellipsis {
   display: inline-block;
   word-break: break-all;
@@ -45,7 +17,10 @@
   }
 }
 
-.linesCover {
-  .textOverflowMulti();
-  display: block;
+.lineClamp {
+  position: relative;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  display: -webkit-box;
+  -webkit-box-orient: vertical;
 }

src/components/Ellipsis/index.md

@@ -13,9 +13,6 @@ order: 10
 
 参数 | 说明 | 类型 | 默认值
 ----|------|-----|------
-tooltip | 移动到 `...` 展示完整内容的提示，在长度截取和覆盖模式的行数截取下可用 | boolean | -
+tooltip | 移动到文本展示完整内容的提示 | boolean | -
 length | 在按照长度截取下的文本最大字符数，超过则截取省略 | number | -
 lines | 在按照行数截取下最大的行数，超过则截取省略 | number | `1`
-cover | 在按照行数截取下开启覆盖模式，这种模式 `...` 是使用样式覆盖到文本上的，所以文本内容可以是 `ReactNode` | boolean | false
-suffixColor | 在覆盖模式下后缀符号 `...` 的背景颜色 | string | `#fff`
-suffixOffset | 在覆盖下后缀符号 `...` 位置偏移量，用于更精细的调整截取位置 | number | `0`

src/routes/List/CardList.js

@@ -68,7 +68,7 @@ export default class CardList extends PureComponent {
                     avatar={<img alt="" className={styles.cardAvatar} src={item.avatar} />}
                     title={<a href="#">{item.title}</a>}
                     description={(
-                      <Ellipsis lines={3} cover suffixOffset={2}>{item.description}</Ellipsis>
+                      <Ellipsis className={styles.item} lines={3}>{item.description}</Ellipsis>
                     )}
                   />
                 </Card>

src/routes/List/CardList.less

@@ -22,6 +22,9 @@
       }
     }
   }
+  .item {
+    height: 64px;
+  }
 }
 
 .extraImg {