render() {
    let computedStyle = {
      ...style.style,
      ...this.props.style,
    };
    if (this.props._isDisabled) {
      computedStyle = {
        ...computedStyle,
        ...style.disabledStyle,
        ...this.props.disabledStyle,
      };
    }

    return (
      <div style={ computedStyle } {...this.state.childProps}>
        { this.props.children }
      </div>
    );
  }
Update the childProps based on the updated properties passed to the
Placeholder.