This package provides Topology View components based on [PatternFly 4][patternfly-4]

Based from https://github.com/patternfly/patternfly-react version 4.91.40

This project currently supports Node Active LTS releases. Please stay current with Node Active LTS when developing patternfly-react.

For example, to develop with Node 8, use the following:

nvm install 8
nvm use 8

This project also requires a Yarn version of >=1.6.0. The latest version can be installed here.

yarn add @patternfly/react-topology

or

npm install @patternfly/react-topology --save

To use React Topology out-of-the-box, you will first need to transform your back-end data into a Model. These model objects contain the information needed to display the nodes and edges. Each node and edge has a set of properties used by PF Topology as well as a data field which can be used to customize the nodes and edges by the application.

You will then need to declare a controller, which can be initialized via the useVisualizationController() method.

The fromModel method must be called on the controller to create the nodes. fromModel will take your data model as a parameter. Your data model should include a graph object, on which you will need to set id , type and layout.

To create your topology view component, you can use TopologyView to Wrap <VisualizationSurface> which can accept state as a parameter. The state is application specific. It can be any data the application wants to store/retrieve from the controller. Adding state to the surface allows hooks to update when state changes. The state is useful to keep graph state such as selected elements.

Use a controller to wrap your topology view component. In the example below, this is done via the VisualizationProvider which consumes the Controller via context.

Three register methods are accessed by the controller.

The following two must be declared explicitly:

• registerLayoutFactory: This method sets the layout of your topology view (e.g. Force, Dagre, Cola, etc.). You can use defaultLayoutFactory as a parameter if your application supports all layouts. You can also update defaultLayout to a custom implementation if you only want to support a subset of the available layout options.

• registerComponentFactory: This method lets you customize the components in your topology view (e.g. nodes, groups, and edges). You can use defaultComponentFactory as a parameter.

The register method below is initialized in Visualization.ts, therefore it doesn't need to be declared unless you want to support a custom implementation which modifies the types.

• registerElementFactory: This method sets the types of the elements being used (e.g. graphs, nodes, edges). defaultElementFactory uses types from ModelKind and is exported in index.ts.

import * as React from 'react';
import {
  EdgeStyle,
  Model,
  NodeShape,
  SELECTION_EVENT,
  Visualization,
  VisualizationProvider,
  VisualizationSurface
} from '@patternfly/react-topology';
import defaultLayoutFactory from './layouts/defaultLayoutFactory';
import defaultComponentFactory from './components/defaultComponentFactory';

const NODE_SHAPE = NodeShape.ellipse;
const NODE_DIAMETER = 75;

const NODES = [
  {
    id: 'node-0',
    type: 'node',
    label: 'Node 0',
    width: NODE_DIAMETER,
    height: NODE_DIAMETER,
    shape: NODE_SHAPE
  },
  {
    id: 'node-1',
    type: 'node',
    label: 'Node 1',
    width: NODE_DIAMETER,
    height: NODE_DIAMETER,
    shape: NODE_SHAPE
  },
  {
    id: 'node-2',
    type: 'node',
    label: 'Node 2',
    width: NODE_DIAMETER,
    height: NODE_DIAMETER,
    shape: NODE_SHAPE
  },
  {
    id: 'node-3',
    type: 'node',
    label: 'Node 3',
    width: NODE_DIAMETER,
    height: NODE_DIAMETER,
    shape: NODE_SHAPE
  },
  {
    id: 'node-4',
    type: 'node',
    label: 'Node 4',
    width: NODE_DIAMETER,
    height: NODE_DIAMETER,
    shape: NODE_SHAPE
  },
  {
    id: 'node-5',
    type: 'node',
    label: 'Node 5',
    width: NODE_DIAMETER,
    height: NODE_DIAMETER,
    shape: NODE_SHAPE
  },
  {
    id: 'Group-1',
    children: ['node-0', 'node-1', 'node-2', 'node-3'],
    type: 'group-hull',
    group: true,
    label: 'Group-1',
    style: {
      padding: 15
    }
  }
];

const EDGES = [
  {
    id: 'edge-node-4-node-5',
    type: 'edge',
    source: 'node-4',
    target: 'node-5',
    edgeStyle: EdgeStyle.default
  },
  {
    id: 'edge-node-0-node-2',
    type: 'edge',
    source: 'node-0',
    target: 'node-2',
    edgeStyle: EdgeStyle.default
  }
];

export const TopologyBaselineDemo = React.memo(() => {
  const [selectedIds, setSelectedIds] = React.useState<string[]>([]);

  const controller = React.useMemo(() => {
    const model: Model = {
      nodes: NODES,
      edges: EDGES,
      graph: {
        id: 'g1',
        type: 'graph',
        layout: 'Cola'
      }
    };

    const newController = new Visualization();
    newController.registerLayoutFactory(defaultLayoutFactory);
    newController.registerComponentFactory(defaultComponentFactory);

    newController.addEventListener(SELECTION_EVENT, setSelectedIds);

    newController.fromModel(model, false);

    return newController;
  }, []);

  return (
    <VisualizationProvider controller={controller}>
      <VisualizationSurface state={{ selectedIds }} />
    </VisualizationProvider>
  );
});