Add react-lazy-load for Transfer perfermance, close #2860

components/transfer/demo/large-data.md

@@ -0,0 +1,64 @@
+---
+order: 4
+debug: true
+title:
+  zh-CN: 大数据性能测试
+  en-US: Performance Test
+---
+
+## zh-CN
+
+2000 条数据。
+
+## en-US
+
+2000 items.
+
+````jsx
+import { Transfer } from 'antd';
+
+const App = React.createClass({
+  getInitialState() {
+    return {
+      mockData: [],
+      targetKeys: [],
+    };
+  },
+  componentDidMount() {
+    this.getMock();
+  },
+  getMock() {
+    const targetKeys = [];
+    const mockData = [];
+    for (let i = 0; i < 2000; i++) {
+      const data = {
+        key: i.toString(),
+        title: `content${i + 1}`,
+        description: `description of content${i + 1}`,
+        chosen: Math.random() * 2 > 1,
+      };
+      if (data.chosen) {
+        targetKeys.push(data.key);
+      }
+      mockData.push(data);
+    }
+    this.setState({ mockData, targetKeys });
+  },
+  handleChange(targetKeys, direction, moveKeys) {
+    console.log(targetKeys, direction, moveKeys);
+    this.setState({ targetKeys });
+  },
+  render() {
+    return (
+      <Transfer
+        dataSource={this.state.mockData}
+        targetKeys={this.state.targetKeys}
+        onChange={this.handleChange}
+        render={item => item.title}
+      />
+    );
+  },
+});
+
+ReactDOM.render(<App />, mountNode);
+````

components/transfer/index.en-US.md

@@ -15,7 +15,6 @@ To transfer the elements between two columns in an intuitive and efficient way.
 
 ## API
 
-
 | Property      | Description                                     | Type       | Default |
 |-----------|------------------------------------------|------------|--------|
 | dataSource | Used for setting the source data. The elements that are part of this array will be present the left column. Except the elements whose keys are included in `targetKeys` prop. | Array | [] |
@@ -31,11 +30,11 @@ To transfer the elements between two columns in an intuitive and efficient way.
 | searchPlaceholder | The hint text of the search box. | String | 'Search here' |
 | notFoundContent | Text to display when a column is empty. | React.node | 'The list is empty'  |
 | footer | A function used for rendering the footer. | Function(props) |  |
-
+| lazy | property of [react-lazy-load](https://github.com/loktar00/react-lazy-load) for lazy rendering items | Object | `{ height: 32, offset: 32 }` |
 
 ## Warning
 
-According the [standard](http://facebook.github.io/react/docs/multiple-components.html#dynamic-children) of React, the key should always be supplied directly to the elements in the array. In Transfer, the keys should be set on the elements included in `dataSource` array. By default, `key` property is used as an unique identifier. 
+According the [standard](http://facebook.github.io/react/docs/multiple-components.html#dynamic-children) of React, the key should always be supplied directly to the elements in the array. In Transfer, the keys should be set on the elements included in `dataSource` array. By default, `key` property is used as an unique identifier.
 
 If there's no `key` in your data, you should use `rowKey` to specify the key that will be used for uniquely identify each element.
 ```jsx

components/transfer/index.tsx

@@ -35,6 +35,7 @@ export interface TransferProps {
   filterOption: (inputValue: any, item: any) => boolean;
   body?: (props: any) => any;
   rowKey?: (record: any) => string;
+  lazy?: {};
 }
 
 export interface TransferContext {
@@ -73,6 +74,7 @@ export default class Transfer extends React.Component<TransferProps, any> {
     body: PropTypes.func,
     footer: PropTypes.func,
     rowKey: PropTypes.func,
+    lazy: PropTypes.object,
   };
 
   static contextTypes = {
@@ -255,7 +257,7 @@ export default class Transfer extends React.Component<TransferProps, any> {
     const {
       prefixCls = 'ant-transfer', operations = [], showSearch, notFoundContent,
       searchPlaceholder, body, footer, listStyle, className = '',
-      filterOption, render,
+      filterOption, render, lazy,
     } = this.props;
     const { leftFilter, rightFilter, leftCheckedKeys, rightCheckedKeys } = this.state;
 
@@ -271,7 +273,8 @@ export default class Transfer extends React.Component<TransferProps, any> {
     const titles = this.getTitles();
     return (
       <div className={cls}>
-        <List titleText={titles[0]}
+        <List
+          titleText={titles[0]}
           dataSource={leftDataSource}
           filter={leftFilter}
           filterOption={filterOption}
@@ -288,8 +291,10 @@ export default class Transfer extends React.Component<TransferProps, any> {
           body={body}
           footer={footer}
           prefixCls={`${prefixCls}-list`}
+          lazy={lazy}
         />
-        <Operation rightActive={rightActive}
+        <Operation
+          rightActive={rightActive}
           rightArrowText={operations[0]}
           moveToRight={this.moveToRight}
           leftActive={leftActive}
@@ -297,7 +302,8 @@ export default class Transfer extends React.Component<TransferProps, any> {
           moveToLeft={this.moveToLeft}
           className={`${prefixCls}-operation`}
         />
-        <List titleText={titles[1]}
+        <List
+          titleText={titles[1]}
           dataSource={rightDataSource}
           filter={rightFilter}
           filterOption={filterOption}
@@ -314,6 +320,7 @@ export default class Transfer extends React.Component<TransferProps, any> {
           body={body}
           footer={footer}
           prefixCls={`${prefixCls}-list`}
+          lazy={lazy}
         />
       </div>
     );

components/transfer/index.zh-CN.md

@@ -16,7 +16,6 @@ title: Transfer
 
 ## API
 
-
 | 参数      | 说明                                     | 类型       | 默认值 |
 |-----------|------------------------------------------|------------|--------|
 | dataSource | 数据源，其中的数据将会被渲染到左边一栏中，`targetKeys` 中指定的除外。 | Array | [] |
@@ -33,7 +32,7 @@ title: Transfer
 | searchPlaceholder | 搜索框的默认值 | String | '请输入搜索内容' |
 | notFoundContent | 当列表为空时显示的内容 | React.node | '列表为空'  |
 | footer | 底部渲染函数 | Function(props) |  |
-
+| lazy | Transfer 使用了 [react-lazy-load](https://github.com/loktar00/react-lazy-load) 优化性能，这里可以设置相关参数 | Object | `{ height: 32, offset: 32 }` |
 
 ## 注意
 

components/transfer/list.tsx

@@ -5,6 +5,7 @@ import classNames from 'classnames';
 import Animate from 'rc-animate';
 import PureRenderMixin from 'rc-util/lib/PureRenderMixin';
 import assign from 'object-assign';
+import Lazyload from 'react-lazy-load';
 import { TransferItem } from './index';
 
 function noop() {
@@ -35,6 +36,7 @@ export interface TransferListProps {
   position?: string;
   notFoundContent?: React.ReactNode | string;
   filterOption: (filterText: any, item: any) => boolean;
+  lazy?: {};
 }
 
 export interface TransferListContext {
@@ -135,7 +137,7 @@ export default class TransferList extends React.Component<TransferListProps, any
   }
 
   render() {
-    const { prefixCls, dataSource, titleText, filter, checkedKeys,
+    const { prefixCls, dataSource, titleText, filter, checkedKeys, lazy,
             body = noop, footer = noop, showSearch, render = noop, style } = this.props;
 
     let { searchPlaceholder, notFoundContent } = this.props;
@@ -177,16 +179,22 @@ export default class TransferList extends React.Component<TransferListProps, any
         [`${prefixCls}-content-item`]: true,
         [`${prefixCls}-content-item-disabled`]: item.disabled,
       });
+      const lazyProps = assign({
+        height: 32,
+        offset: 320,
+      }, lazy);
       return (
-        <li
+        <Lazyload key={item.key} {...lazyProps}>
-          key={item.key}
+          <li
-          className={className}
+            key={item.key}
-          title={renderedText}
+            className={className}
-          onClick={item.disabled ? undefined : () => this.handleSelect(item)}
+            title={renderedText}
-        >
+            onClick={item.disabled ? undefined : () => this.handleSelect(item)}
-          <Checkbox checked={checkedKeys.some(key => key === item.key)} disabled={item.disabled} />
+          >
-          <span>{renderedEl}</span>
+            <Checkbox checked={checkedKeys.some(key => key === item.key)} disabled={item.disabled} />
-        </li>
+            <span>{renderedEl}</span>
+          </li>
+        </Lazyload>
       );
     });
 

components/transfer/style/index.less

@@ -98,6 +98,7 @@
         white-space: nowrap;
         text-overflow: ellipsis;
         padding: 7px 15px;
+        min-height: 32px;
         transition: all 0.3s ease;
       }
 

package.json

@@ -71,6 +71,7 @@
     "rc-tree-select": "~1.8.0",
     "rc-upload": "~2.2.0",
     "rc-util": "^4.0.1",
+    "react-lazy-load": "^3.0.10",
     "react-slick": "~0.14.2",
     "shallowequal": "^0.2.2",
     "warning": "~3.0.0"

typings/custom-typings.d.ts

@@ -76,6 +76,8 @@ declare module 'rc-collapse';
 
 declare module 'rc-form*';
 
+declare module 'react-lazy-load';
+
 declare var process: {
   env: {
     NODE_ENV: string