Recommended way to have drawer resizable?

Question

I would like to have the material ui drawer\'s width resizable through a draggable handle. My current approach is to have a mousevent listener on the whole app which checks

Answer 1

You can do that with css only, if that fits your need. It's the simplest solution. Look mom, no javascript.

.resizable {
  height: 150px;
  width: 150px;
  border: 1px solid #333;
  resize: horizontal;
  overflow: auto;
}

<div class="resizable"></div>

Reference on MDN

Answer 2

I would like to add an answer that is more up to date using React Hooks.

You can do it like this, then:

CSS:

sidebar-dragger: {
  width: '5px',
  cursor: 'ew-resize',
  padding: '4px 0 0',
  borderTop: '1px solid #ffffd',
  position: 'absolute',
  top: 0,
  left: 0,
  bottom: 0,
  zIndex: '100',
  backgroundColor: '#f4f7f9'
}

React (using hooks with refs and states)

let isResizing = null;

function ResizeableSidebar (props) {
  const sidebarPanel = React.useRef('sidebarPanel');
  const cbHandleMouseMove = React.useCallback(handleMousemove, []);
  const cbHandleMouseUp = React.useCallback(handleMouseup, []);

  function handleMousedown (e) {
    e.stopPropagation();
    e.preventDefault();
    // we will only add listeners when needed, and remove them afterward
    document.addEventListener('mousemove', cbHandleMouseMove);
    document.addEventListener('mouseup', cbHandleMouseUp);
    isResizing = true;
  };

  function handleMousemove (e) {
    if (!isResizing) {
      return;
    }

    let offsetRight =
      document.body.offsetWidth - (e.clientX - document.body.offsetLeft);
    let minWidth = 50;
    if (offsetRight > minWidth) {
      let curSize = offsetRight - 60;
      // using a ref instead of state will be way faster
      sidebarPanel.current.style.width = curSize + 'px';
    }
  };

  function handleMouseup (e) {
    if (!isResizing) {
      return;
    }
    isResizing = false;
    document.removeEventListener('mousemove', cbHandleMouseMove);
    document.removeEventListener('mouseup', cbHandleMouseUp);
  };

  return <div className="sidebar-container">
    <div
      className="sidebar-dragger"
      onMouseDown={handleMousedown}
    />
    <div>
      Your stuff goes here
    </div>
  </div>;
}

Answer 3

You can use indicator dragger with mousedown on it.

Here for example

// styles
dragger: {
  width: '5px',
  cursor: 'ew-resize',
  padding: '4px 0 0',
  borderTop: '1px solid #ffffd',
  position: 'absolute',
  top: 0,
  left: 0,
  bottom: 0,
  zIndex: '100',
  backgroundColor: '#f4f7f9'
}

...

state = {
  isResizing: false,
  lastDownX: 0,
  newWidth: {}
};

handleMousedown = e => {
  this.setState({ isResizing: true, lastDownX: e.clientX });
};

handleMousemove = e => {
  // we don't want to do anything if we aren't resizing.
  if (!this.state.isResizing) {
    return;
  }

  let offsetRight =
    document.body.offsetWidth - (e.clientX - document.body.offsetLeft);
  let minWidth = 50;
  let maxWidth = 600;
  if (offsetRight > minWidth && offsetRight < maxWidth) {
    this.setState({ newWidth: { width: offsetRight } });
  }
};

handleMouseup = e => {
  this.setState({ isResizing: false });
};

componentDidMount() {
  document.addEventListener('mousemove', e => this.handleMousemove(e));
  document.addEventListener('mouseup', e => this.handleMouseup(e));
}

...

<Drawer
  variant="permanent"
  open
  anchor={'right'}
  classes={{
    paper: classes.drawerPaper
  }}
  PaperProps={{ style: this.state.newWidth }}
>
  <div
    id="dragger"
    onMouseDown={event => {
      this.handleMousedown(event);
    }}
    className={classes.dragger}
  />
  {drawer}
</Drawer>

The idea is, when click the dragger, it will resize width Drawer followed mouse move.

Play DEMO.

Answer 4

Just use a synthetic event on your handle element. That way, you can avoid the messiness/performance costs of having a universal event listener. Something like the following:

render() {
     return (
       <div onMouseDown={this.yourResizeFunc}>
       </div>
  );
}