FullWidthSection/src/webparts/fullWidthSectionWebPart/FullWidthSectionWebPartWebPart.ts

import * as React from 'react';
import * as ReactDom from 'react-dom';
import { DisplayMode, Version } from '@microsoft/sp-core-library';
import {
  BaseClientSideWebPart,
  IPropertyPaneConfiguration,
  PropertyPaneSlider
} from '@microsoft/sp-webpart-base';

import * as strings from 'FullWidthSectionWebPartWebPartStrings';
import FullWidthSectionWebPart from './components/FullWidthSectionWebPart';
import { IFullWidthSectionWebPartProps } from './components/IFullWidthSectionWebPartProps';

export interface IFullWidthSectionWebPartWebPartProps {
  horizontalPadding: number;
  padding?: number;
}

export default class FullWidthSectionWebPartWebPart extends BaseClientSideWebPart<IFullWidthSectionWebPartWebPartProps> {

  protected onInit(): Promise<void> {
    return super.onInit().then(() => {
      if (typeof this.properties.horizontalPadding !== 'number' && typeof this.properties.padding === 'number') {
        this.properties.horizontalPadding = this.properties.padding;
      }
    });
  }

  public render(): void {
    let horizontalPadding = 20;

    if (typeof this.properties.horizontalPadding === 'number') {
      horizontalPadding = this.properties.horizontalPadding;
    } else if (typeof this.properties.padding === 'number') {
      horizontalPadding = this.properties.padding;
    }

    const element: React.ReactElement<IFullWidthSectionWebPartProps> = React.createElement(
      FullWidthSectionWebPart,
      {
        horizontalPadding: horizontalPadding,
        domElement: this.domElement,
        displayMode: this.displayMode
      }
    );

    ReactDom.render(element, this.domElement);
  }

  protected onDispose(): void {
    ReactDom.unmountComponentAtNode(this.domElement);
  }

  protected get dataVersion(): Version {
    return Version.parse('1.0');
  }

  protected getPropertyPaneConfiguration(): IPropertyPaneConfiguration {
    return {
      pages: [
        {
          header: {
            description: strings.PropertyPaneDescription
          },
          groups: [
            {
              groupName: strings.BasicGroupName,
              groupFields: [
                PropertyPaneSlider('horizontalPadding', {
                  label: strings.HorizontalPaddingFieldLabel,
                  min: 0,
                  max: 100,
                  step: 1,
                  showValue: true
                })
              ]
            }
          ]
        }
      ]
    };
  }
}