【极客日常】electron+react+antd深色主题打造桌面应用

桌面应用的实现方式有很多,但谈到多操作系统平台兼容的话,就不得不提到electron。electron是前端开发的利好,做过web前端的同学只要稍微迁移下自己的项目,就能够将原本的web前端变成桌面应用。

因此,本文以react为例,以antd为UI库支持,讲解基于react的electron应用该如何搭建。

首先,electron-react-boilerplate项目,就帮助我们初始化了基于react的electron应用。electron-react-boilerplate内置了flow静态类型检查机制、基于webpack的electron应用打包支持以及with redux的前端架构。故在此基础上再引入其它的lib,也不会过于困难。本文采用的electron-react-boilerplate版本为0.17.1。

通过yarn add antd,就可以安装上antd库。要在内置的例子里以antd为layout的话,首先需要在app文件夹下新建app.global.less文件,填充内容:@import '../node_modules/antd/dist/antd.less';,然后我们可以再观察到,app/containers/Root.js是redux store的抽象层,wrap了路由;路由所在的文件为app/Route.js,是以标签为根的路由集合;主界面所在的文件为app/containers/App.js,我们通过更改其中的内容,就可以变换主界面的样式了。我们就以antd的layout为例,写一个App主界面:

import React from 'react';
import PropTypes from 'prop-types';
import { withRouter } from 'react-router-dom';
import { Layout, Card, Icon, Menu, Button } from 'antd';
import { shell } from 'electron';
import routes from '../constants/routes';

const { Sider, Content } = Layout;

type Props = {
  children: React.Node
};

type State = {
  menuKey: string
};

const menuList = [
  { key: 'note', text: '笔记', icon: 'book' },
  { key: 'setting', text: '设置', icon: 'setting' }
];

class App extends React.Component<Props, State> {
  props: Props;

  static propTypes = {
    history: PropTypes.object.isRequired
  };

  state = {
    menuKey: 'note'
  };

  handleMenuClick = (e: Event) => {
    this.setState({ menuKey: e.key });
    const { history } = this.props;
    history.push(routes[e.key]);
  };

  render() {
    const { children } = this.props;
    const { menuKey } = this.state;
    return (
      <Layout style={{ minHeight: '100vh' }}>
        <Sider collapsible={false}>
          <Menu
            style={{ height: '100%' }}
            theme="dark"
            onClick={this.handleMenuClick}
            selectedKeys={[menuKey]}
            mode="inline"
          >
            {menuList.map(item => (
              <Menu.Item key={item.key}>
                <span>
                  <Icon type={item.icon} />
                  {`\t${item.text}`}
                </span>
              </Menu.Item>
            ))}
          </Menu>
        </Sider>
        <Content>
          <Card
            title={menuList.find(i => i.key === menuKey).text}
            style={{ height: '100%' }}
            extra={
              <Button
                shape="circle"
                onClick={() =>shell.openExternal('https://github.com')}
                icon="github"
              />
            }
          >
            {children}
          </Card>
        </Content>
      </Layout>
    );
  }
}

export default withRouter(App);

写App主界面后,记得也得实时更新app/Route.js以及其关联的app/constants/routes.json数据喔~

app/containers中其它以Page结尾的文件,约定俗成是各个子路由绑定redux的层次。比如在上面我们设置了笔记的menu,那么在app/containers/NotePage.js中,就可以定义跟redux的绑定:

import { bindActionCreators } from 'redux';
import { connect } from 'react-redux';
import Note from '../components/note/index';
import * as NoteActions from '../actions/note';

function mapStateToProps(state) {
  return { ...state.note };
}

function mapDispatchToProps(dispatch) {
  return bindActionCreators(NoteActions, dispatch);
}

export default connect(
  mapStateToProps,
  mapDispatchToProps
)(Note);

之后在app/components/note/index.js中,就可以编写笔记页面的样式了。

至于redux这块,由于flow增加了静态检查,因此会稍微麻烦一点。虽然在app/reducers/index.js中已经帮我们完成了reducer的绑定,但在app/reducers/types.js中,还需要初始化各个state的类型:

import type { Dispatch as ReduxDispatch, Store as ReduxStore } from 'redux';

// action
export type Action = {
  +type: string
};

// note state
export type NoteState = {
  notes: Array
};

// state type
export type StateType = {
  note: NoteState
};

export type GetState = () => StateType;

export type Dispatch = ReduxDispatch<Action>;

export type Store = ReduxStore<GetState, Action>;

之后根据预定义的类型,再写action跟reducer。拿note笔记模块为例,action跟reducer如下:

// app/actions/note.js
import type { Dispatch } from '../reducers/types';

export function add() {
  return (dispatch: Dispatch) => dispatch({ type: 'ADD_NOTE' });
}

export function edit(index: number) {
  return (dispatch: Dispatch) => dispatch({ type: 'EDIT_NOTE', index });
}

export function remove() {
  return (dispatch: Dispatch) => dispatch({ type: 'REMOVE_NOTE' });
}

export function clear() {
  return (dispatch: Dispatch) => dispatch({ type: 'CLEAR_NOTE' });
}

// app/reducers/note.js
import type { Action, NoteState } from './types';

const defaultState: NoteState = {
  notes: []
};

const addNote = state => ({
  ...state,
  notes: [...state.notes, state.notes.length + 1]
});

const editNote = (state, payload) => {
  const { notes } = state;
  const { index } = payload;
  console.log(payload);
  if (index >= notes.length || index < 0) {
    return state;
  }
  const newNotes = [...notes];
  newNotes[index] *= 2;
  return { ...state, notes: newNotes };
};

const removeNote = state => {
  const { notes } = state;
  if (notes.length === 0) {
    return state;
  }
  const newNotes = [...notes];
  newNotes.splice(newNotes.length - 1, 1);
  return { ...state, notes: newNotes };
};

const clearNote = state => ({ ...state, notes: [] });

export default function note(state: NoteState = defaultState, action: Action) {
  const { type, ...payload } = action;
  switch (type) {
    case 'ADD_NOTE': {
      return addNote(state);
    }
    case 'EDIT_NOTE': {
      return editNote(state, payload);
    }
    case 'REMOVE_NOTE': {
      return removeNote(state);
    }
    case 'CLEAR_NOTE': {
      return clearNote(state);
    }
    default: {
      return state;
    }
  }
}

这样便初始化好了基本的笔记增删改查操作,整个桌面应用就有雏形了。

桌面软件一般会有标题与菜单栏,标题的修改是在app/app.htmltitle标签,而菜单的修改在app/menu.js中。

antd的深色主题在桌面应用中显示会不错,因此我们想要最终产品为深色主题。值得注意的是,由于我们刚开始引入antd新建了less文件,但electron-react-boilerplate默认不支持less,因此需要我们在开发与生产环境的webpack配置中(configs/webpack.config.renderer.dev.babel.jsconfigs/webpack.config.renderer.prod.babel.js)先将antd的深色主题import进来,然后自行yarn add less-loader,再在配置中的module.rules列表中,追加一段就好:

import antdTheme from '@ant-design/dark-theme';

...

{
  test: /\.less$/,
  use: [
    {
      loader: 'style-loader'
    },
    {
      loader: 'css-loader' // translates CSS into CommonJS
    },
    {
      loader: 'less-loader', // compiles Less to CSS
      options: {
        modifyVars: antdTheme,
        javascriptEnabled: true
      }
    }
  ]
}

...

这样,electron+react+antd深色主题桌面应用的基础流程就打通了。

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