From 8bef4f04c2b0b203450fe5753b6109a0b0d04e82 Mon Sep 17 00:00:00 2001
From: ditoaugusta <dt_ap@ymail.com>
Date: Fri, 27 Mar 2020 17:39:49 +0700
Subject: exp: hooks (1)

---
 modern/src/DeviceList.js  |  46 ++++++-------
 modern/src/LoginPage.js   | 166 +++++++++++++++++++++-------------------------
 modern/src/MainPage.js    |  82 ++++++++++-------------
 modern/src/MainToolbar.js | 147 ++++++++++++++++++----------------------
 4 files changed, 191 insertions(+), 250 deletions(-)

diff --git a/modern/src/DeviceList.js b/modern/src/DeviceList.js
index 235ba229..8d855a76 100644
--- a/modern/src/DeviceList.js
+++ b/modern/src/DeviceList.js
@@ -1,30 +1,26 @@
-import React, { Component, Fragment } from 'react';
-import { connect } from 'react-redux';
+import React, { Fragment } from 'react';
+import Avatar from '@material-ui/core/Avatar';
+import Divider from '@material-ui/core/Divider';
+import IconButton from '@material-ui/core/IconButton';
 import List from '@material-ui/core/List';
 import ListItem from '@material-ui/core/ListItem';
 import ListItemAvatar from '@material-ui/core/ListItemAvatar';
+import ListItemSecondaryAction from '@material-ui/core/ListItemSecondaryAction';
 import ListItemText from '@material-ui/core/ListItemText';
-import Avatar from '@material-ui/core/Avatar';
 import LocationOnIcon from '@material-ui/icons/LocationOn';
-import ListItemSecondaryAction from '@material-ui/core/ListItemSecondaryAction';
-import IconButton from '@material-ui/core/IconButton';
 import MoreVertIcon from '@material-ui/icons/MoreVert';
-import Divider from '@material-ui/core/Divider';
-import { devicesActions } from './store';
 
-const mapStateToProps = state => ({
-  devices: Object.values(state.devices.items)
-});
+import { useDispatch, useSelector } from 'react-redux';
+import { devicesActions } from './store';
 
-class DeviceList extends Component {
-  handleClick(device) {
-    this.props.dispatch(devicesActions.select(device));
-  }
+const DeviceList = () => {
+  const devices = useSelector(state => Object.values(state.devices.items));
+  const dispatch = useDispatch();
 
-  render() {
-    const devices = this.props.devices.map((device, index, list) =>
-      <Fragment key={device.id.toString()}>
-        <ListItem button onClick={(e) => this.handleClick(device)}>
+  return (<List>
+    {devices.map((device, index, list) => (
+      <Fragment key={device.id}>
+        <ListItem button key={device.id} onClick={() => dispatch(devicesActions.select(device))}>
           <ListItemAvatar>
             <Avatar>
               <LocationOnIcon />
@@ -39,14 +35,10 @@ class DeviceList extends Component {
         </ListItem>
         {index < list.length - 1 ? <Divider /> : null}
       </Fragment>
-    );
-
-    return (
-      <List>
-        {devices}
-      </List>
-    );
-  }
+    ))
+    }
+  </List>);
 }
 
-export default connect(mapStateToProps)(DeviceList);
+export default DeviceList;
+
diff --git a/modern/src/LoginPage.js b/modern/src/LoginPage.js
index c094fa3b..1f0b950b 100644
--- a/modern/src/LoginPage.js
+++ b/modern/src/LoginPage.js
@@ -1,13 +1,14 @@
-import React, { Component } from 'react';
+import React, { useState } from 'react';
+import { useHistory } from 'react-router-dom';
 import Button from '@material-ui/core/Button';
 import FormHelperText from '@material-ui/core/FormHelperText';
 import FormControl from '@material-ui/core/FormControl';
 import Input from '@material-ui/core/Input';
 import InputLabel from '@material-ui/core/InputLabel';
 import Paper from '@material-ui/core/Paper';
-import withStyles from '@material-ui/core/styles/withStyles';
+import { makeStyles } from '@material-ui/core';
 
-const styles = theme => ({
+const useStyles = makeStyles(theme => ({
   root: {
     width: 'auto',
     display: 'block', // Fix IE11 issue.
@@ -38,111 +39,94 @@ const styles = theme => ({
     flex: '1 1 0',
     margin: `${theme.spacing(3)}px ${theme.spacing(1)}px 0`
   },
-});
+}));
 
-class LoginPage extends Component {
-  constructor(props) {
-    super(props);
-    this.state = {
-      filled: false,
-      loading: false,
-      failed: false,
-      email: "",
-      password: ""
-    };
-    this.handleChange = this.handleChange.bind(this);
-    this.handleRegister = this.handleRegister.bind(this);
-    this.handleLogin = this.handleLogin.bind(this);
+const LoginPage = () => {
+  const [filled, setFilled] = useState(false);
+  const [loading, setLoading] = useState(false);
+  const [failed, setFailed] = useState(false);
+  const [email, setEmail] = useState('');
+  const [password, setPassword] = useState('');
+
+  const classes = useStyles();
+  const history = useHistory();
+
+  const handleEmailChange = (event) => {
+    setEmail(event.target.value);
   }
 
-  handleChange(event) {
-    this.setState({
-      [event.target.id]: event.target.value
-    });
+  const handlePasswordChange = (event) => {
+    setPassword(event.target.value);
   }
 
-  handleRegister() {
-    // TODO implement registration
+  const handleRegister = () => {
+    // TODO: Implement registration
   }
 
-  handleLogin(event) {
+  const handleLogin = (event) => {
     event.preventDefault();
-    const { email, password } = this.state;
-    fetch("/api/session", {
-      method: "POST",
-      body: new URLSearchParams(`email=${email}&password=${password}`)
-    }).then(response => {
+    fetch('/api/session', { method: 'POST', body: new URLSearchParams(`email=${email}&password=${password}`) }).then(response => {
       if (response.ok) {
-        this.props.history.push('/'); // TODO avoid calling sessions twice
+        history.push('/'); // TODO: Avoid calling sessions twice
       } else {
-        this.setState({
-          failed: true,
-          password: ""
-        });
+        setFailed(true);
+        setPassword('');
       }
     });
   }
 
-  render() {
-    const { classes } = this.props;
-    const { failed, email, password } = this.state;
-    return (
-      <main className={classes.root}>
-        <Paper className={classes.paper}>
-
-          <img className={classes.logo} src="/logo.svg" alt="Traccar" />
-
-          <form onSubmit={this.handleLogin}>
-
-            <FormControl margin="normal" required fullWidth error={failed}>
-              <InputLabel htmlFor="email">Email</InputLabel>
-              <Input
-                id="email"
-                value={email}
-                autoComplete="email"
-                autoFocus
-                onChange={this.handleChange} />
-              { failed && <FormHelperText>Invalid username or password</FormHelperText> }
-            </FormControl>
-
-            <FormControl margin="normal" required fullWidth>
-              <InputLabel htmlFor="password">Password</InputLabel>
-              <Input
-                id="password"
-                type="password"
-                value={password}
-                autoComplete="current-password"
-                onChange={this.handleChange} />
-            </FormControl>
-
-            <div className={classes.buttons}>
-
-              <Button
-                type="button"
-                variant="contained"
-                disabled
-                className={classes.button}
-                onClick={this.handleRegister}>
-                Register
+  return (
+    <main className={classes.root}>
+      <Paper className={classes.paper}>
+        <img className={classes.logo} src="/logo.svg" alt="Traccar" />
+        <form onSubmit={handleLogin}>
+          <FormControl margin="normal" required fullWidth error={failed}>
+            <InputLabel htmlFor="email">Email</InputLabel>
+            <Input
+              id="email"
+              name="email"
+              value={email}
+              autoComplete="email"
+              autoFocus
+              onChange={handleEmailChange} />
+            {failed && <FormHelperText>Invalid username or password</FormHelperText>}
+          </FormControl>
+
+          <FormControl margin="normal" required fullWidth>
+            <InputLabel htmlFor="password">Password</InputLabel>
+            <Input
+              id="password"
+              name="password"
+              type="password"
+              value={password}
+              autoComplete="current-password"
+              onChange={handlePasswordChange} />
+          </FormControl>
+
+          <div className={classes.buttons}>
+            <Button
+              type="button"
+              variant="contained"
+              disabled
+              className={classes.button}
+              onClick={handleRegister}>
+              Register
               </Button>
 
-              <Button
-                type="submit"
-                variant="contained"
-                color="primary"
-                disabled={!email || !password}
-                className={classes.button}>
-                Login
+            <Button
+              type="submit"
+              variant="contained"
+              color="primary"
+              disabled={!email || !password}
+              className={classes.button}>
+              Login
               </Button>
 
-            </div>
-
-          </form>
-
-        </Paper>
-      </main>
-    );
-  }
+          </div>
+        </form>
+      </Paper>
+    </main>
+  );
 }
 
-export default withStyles(styles)(LoginPage);
+export default LoginPage;
diff --git a/modern/src/MainPage.js b/modern/src/MainPage.js
index 450a5e00..8e9b695f 100644
--- a/modern/src/MainPage.js
+++ b/modern/src/MainPage.js
@@ -1,14 +1,14 @@
-import React, { Component } from 'react';
+import React, { useState, useEffect } from 'react';
 import ContainerDimensions from 'react-container-dimensions';
 import MainToobar from './MainToolbar';
 import MainMap from './MainMap';
 import Drawer from '@material-ui/core/Drawer';
-import withStyles from '@material-ui/core/styles/withStyles';
 import SocketController from './SocketController';
-import withWidth, { isWidthUp } from '@material-ui/core/withWidth';
 import DeviceList from './DeviceList';
+import { makeStyles } from '@material-ui/core';
+import { useHistory } from 'react-router-dom';
 
-const styles = theme => ({
+const useStyles = makeStyles(theme => ({
   root: {
     height: "100vh",
     display: "flex",
@@ -35,57 +35,43 @@ const styles = theme => ({
   mapContainer: {
     flexGrow: 1
   }
-});
+}));
 
-class MainPage extends Component {
-  constructor(props) {
-    super(props);
-    this.state = {
-      loading: true
-    };
-  }
+const MainPage = () => {
+  const [loading, setLoading] = useState(true);
+  const classes = useStyles();
+  const history = useHistory();
 
-  componentDidMount() {
+  useEffect(() => {
     fetch('/api/session').then(response => {
       if (response.ok) {
-        this.setState({
-          loading: false
-        });
+        setLoading(false);
       } else {
-        this.props.history.push('/login');
+        history.push('/login');
       }
     });
-  }
+  }, [history]);
 
-  render() {
-    const { classes } = this.props;
-    const { loading } = this.state;
-    if (loading) {
-      return (
-        <div>Loading...</div>
-      );
-    } else {
-      return (
-        <div className={classes.root}>
-          <SocketController />
-          <MainToobar history={this.props.history} />
-          <div className={classes.content}>
-            <Drawer
-              anchor={isWidthUp('sm', this.props.width) ? "left" : "bottom"}
-              variant="permanent"
-              classes={{ paper: classes.drawerPaper }}>
-              <DeviceList />
-            </Drawer>
-            <div className={classes.mapContainer}>
-              <ContainerDimensions>
-                <MainMap/>
-              </ContainerDimensions>
-            </div>
-          </div>
-        </div>
-      );
-    }
-  }
+  return (loading ? (<div>Loading...</div>) : (<div className={classes.root}>
+    <SocketController />
+    <MainToobar history={history} />
+    <div className={classes.content}>
+      { /* <Drawer
+        anchor={isWidthUp('sm', this.props.width) ? "left" : "bottom"} NOTE: What's this do?
+        variant="permanent"
+      classes={{ paper: classes.drawerPaper }}> */}
+      <Drawer
+        variant="permanent"
+        classes={{ paper: classes.drawerPaper }}>
+        <DeviceList />
+      </Drawer>
+      <div className={classes.mapContainer}>
+        <ContainerDimensions>
+          <MainMap />
+        </ContainerDimensions>
+      </div>
+    </div>
+  </div>));
 }
 
-export default withWidth()(withStyles(styles)(MainPage));
+export default MainPage;
diff --git a/modern/src/MainToolbar.js b/modern/src/MainToolbar.js
index 6e2e4d6d..9ec89a2f 100644
--- a/modern/src/MainToolbar.js
+++ b/modern/src/MainToolbar.js
@@ -1,5 +1,6 @@
-import React, { Component, Fragment } from 'react';
-import { withStyles } from '@material-ui/core/styles';
+import React, { useState } from 'react';
+import { useHistory } from 'react-router-dom';
+import { makeStyles } from '@material-ui/core/styles';
 import AppBar from '@material-ui/core/AppBar';
 import Toolbar from '@material-ui/core/Toolbar';
 import Typography from '@material-ui/core/Typography';
@@ -16,7 +17,7 @@ import DashboardIcon from '@material-ui/icons/Dashboard';
 import BarChartIcon from '@material-ui/icons/BarChart';
 import SettingsIcon from '@material-ui/icons/Settings';
 
-const styles = theme => ({
+const useStyles = makeStyles(theme => ({
   flex: {
     flexGrow: 1
   },
@@ -30,94 +31,72 @@ const styles = theme => ({
     marginLeft: -12,
     marginRight: 20,
   }
-});
+}));
 
-class MainToobar extends Component {
-  constructor(props) {
-    super(props);
-    this.state = {
-      drawer: false
-    };
-    this.openDrawer = this.openDrawer.bind(this);
-    this.closeDrawer = this.closeDrawer.bind(this);
-    this.handleLogout = this.handleLogout.bind(this);
-  }
-
-  openDrawer() {
-    this.setState({
-      drawer: true
-    });
-  };
+const MainToolbar = () => {
+  const [drawer, setDrawer] = useState(false);
+  const classes = useStyles();
+  const history = useHistory();
 
-  closeDrawer() {
-    this.setState({
-      drawer: false
-    });
-  };
+  const openDrawer = () => { setDrawer(true) }
+  const closeDrawer = () => { setDrawer(false) }
 
-  handleLogout() {
-    fetch("/api/session", {
-      method: "DELETE"
-    }).then(response => {
+  const handleLogout = () => {
+    fetch('/api/session', { method: 'DELETE' }).then(response => {
       if (response.ok) {
-        this.props.history.push('/login');
+        history.push('/login');
       }
-    });
+    })
   }
 
-  render() {
-    const { classes } = this.props;
-    return (
-      <Fragment>
-        <AppBar position="static" className={classes.appBar}>
-          <Toolbar>
-            <IconButton
-              className={classes.menuButton}
-              color="inherit"
-              onClick={this.openDrawer}>
-              <MenuIcon />
-            </IconButton>
-            <Typography variant="h6" color="inherit" className={classes.flex}>
-              Traccar
+  return (<>
+    <AppBar position="static" className={classes.appBar}>
+      <Toolbar>
+        <IconButton
+          className={classes.menuButton}
+          color="inherit"
+          onClick={openDrawer}>
+          <MenuIcon />
+        </IconButton>
+        <Typography variant="h6" color="inherit" className={classes.flex}>
+          Traccar
             </Typography>
-            <Button color="inherit" onClick={this.handleLogout}>Logout</Button>
-          </Toolbar>
-        </AppBar>
-        <Drawer open={this.state.drawer} onClose={this.closeDrawer}>
-          <div
-            tabIndex={0}
-            className={classes.list}
-            role="button"
-            onClick={this.closeDrawer}
-            onKeyDown={this.closeDrawer}>
-            <List>
-              <ListItem button>
-                <ListItemIcon>
-                  <DashboardIcon />
-                </ListItemIcon>
-                <ListItemText primary="Dashboard" />
-              </ListItem>
-              <ListItem button disabled>
-                <ListItemIcon>
-                  <BarChartIcon />
-                </ListItemIcon>
-                <ListItemText primary="Reports" />
-              </ListItem>
-            </List>
-            <Divider />
-            <List>
-              <ListItem button disabled>
-                <ListItemIcon>
-                  <SettingsIcon />
-                </ListItemIcon>
-                <ListItemText primary="Settings" />
-              </ListItem>
-            </List>
-          </div>
-        </Drawer>
-      </Fragment>
-    );
-  }
+        <Button color="inherit" onClick={handleLogout}>Logout</Button>
+      </Toolbar>
+    </AppBar>
+    <Drawer open={drawer} onClose={closeDrawer}>
+      <div
+        tabIndex={0}
+        className={classes.list}
+        role="button"
+        onClick={closeDrawer}
+        onKeyDown={closeDrawer}>
+        <List>
+          <ListItem button>
+            <ListItemIcon>
+              <DashboardIcon />
+            </ListItemIcon>
+            <ListItemText primary="Dashboard" />
+          </ListItem>
+          <ListItem button disabled>
+            <ListItemIcon>
+              <BarChartIcon />
+            </ListItemIcon>
+            <ListItemText primary="Reports" />
+          </ListItem>
+        </List>
+        <Divider />
+        <List>
+          <ListItem button disabled>
+            <ListItemIcon>
+              <SettingsIcon />
+            </ListItemIcon>
+            <ListItemText primary="Settings" />
+          </ListItem>
+        </List>
+      </div>
+    </Drawer>
+  </>);
 }
 
-export default withStyles(styles)(MainToobar);
+export default MainToolbar;
-- 
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