react-test/docs/data/material/components/buttons/LoadingButtonsTransition.tsx

import * as React from 'react';
import Button from '@mui/material/Button';
import Box from '@mui/material/Box';
import FormControlLabel from '@mui/material/FormControlLabel';
import Switch from '@mui/material/Switch';
import SaveIcon from '@mui/icons-material/Save';
import SendIcon from '@mui/icons-material/Send';

export default function LoadingButtonsTransition() {
  const [loading, setLoading] = React.useState(true);
  function handleClick() {
    setLoading(true);
  }

  return (
    <div>
      <FormControlLabel
        sx={{ display: 'block' }}
        control={
          <Switch
            checked={loading}
            onChange={() => setLoading(!loading)}
            name="loading"
            color="primary"
          />
        }
        label="Loading"
      />
      <Box sx={{ '& > button': { m: 1 } }}>
        <Button
          size="small"
          onClick={handleClick}
          loading={loading}
          variant="outlined"
          disabled
        >
          Disabled
        </Button>
        <Button
          size="small"
          onClick={handleClick}
          loading={loading}
          loadingIndicator="Loading…"
          variant="outlined"
        >
          Fetch data
        </Button>
        <Button
          size="small"
          onClick={handleClick}
          endIcon={<SendIcon />}
          loading={loading}
          loadingPosition="end"
          variant="contained"
        >
          Send
        </Button>
        <Button
          size="small"
          color="secondary"
          onClick={handleClick}
          loading={loading}
          loadingPosition="start"
          startIcon={<SaveIcon />}
          variant="contained"
        >
          Save
        </Button>
      </Box>
      <Box sx={{ '& > button': { m: 1 } }}>
        <Button onClick={handleClick} loading={loading} variant="outlined" disabled>
          Disabled
        </Button>
        <Button
          onClick={handleClick}
          loading={loading}
          loadingIndicator="Loading…"
          variant="outlined"
        >
          Fetch data
        </Button>
        <Button
          onClick={handleClick}
          endIcon={<SendIcon />}
          loading={loading}
          loadingPosition="end"
          variant="contained"
        >
          Send
        </Button>
        <Button
          color="secondary"
          onClick={handleClick}
          loading={loading}
          loadingPosition="start"
          startIcon={<SaveIcon />}
          variant="contained"
        >
          Save
        </Button>
      </Box>
    </div>
  );
}