Content Views, Controls, Groups and Layouts

A Content View is a representation of an iModel's data. It is the main graphics or data view in an iTwin.js application. There may be multiple Content Views displayed at the same time. When more than one Content View is displayed, they are usually separated by splitters, allowing the user to resize the views. There are three constructs used to manage and lay out Content Views:

Content Groups and Layouts may be defined locally in a Frontstage or they may be defined centrally and registered by id with the ConfigurableUiManager.

Defining Content Controls

A Content Control will either subclass ViewportContentControl if the view is a ScreenViewport or ContentControl if the view is a data view.

Subclassing ViewportContentControl

The following shows a sample Viewport content control that subclasses ViewportContentControl. It imports a local ViewportComponent implementation and sets this.reactNode. The options parameter to the constructor comes from the applicationData values set in a Content Group.

import * as React from "react";

import {
  ConfigurableCreateInfo,
  ViewportContentControl,
} from "@bentley/ui-framework";

import { ScreenViewport } from "@bentley/imodeljs-frontend";

import SimpleViewportComponent from "../components/Viewport";

/**
 * iModel Viewport content
 */
export class ViewportContent extends ViewportContentControl {
  constructor(info: ConfigurableCreateInfo, options: any) {
    super(info, options);

    if (options.iModelConnection && options.viewId) {
      this.reactNode = (
        <SimpleViewportComponent
          viewportRef={(v: ScreenViewport) => { this.viewport = v; }}
          imodel={options.iModelConnection}
          viewDefinitionId={options.viewId}
          rulesetId={options.rulesetId} />
      );
    }
  }
}

Note: It is important to provide a viewportRef Prop to the ViewportComponent implementation. The viewportRef function should set this.viewport. This is important in determining when the Frontstage is ready for use.

viewportRef={(v: ScreenViewport) => { this.viewport = v; }}

Subclassing ContentControl

The following shows a sample content control that subclasses ContentControl and displays a Table data component.

import * as React from "react";

import {
  ConfigurableCreateInfo,
  ContentControl,
} from "@bentley/ui-framework";

import SimpleTableComponent from "../components/Table";

/**
 * Table content
 */
export class TableContent extends ContentControl {
  constructor(info: ConfigurableCreateInfo, options: any) {
    super(info, options);

    if (options.iModelConnection) {
      this.reactNode = <SimpleTableComponent imodel={options.iModelConnection} rulesetId={options.rulesetId} />;
    }
  }
}

Defining Content Groups

When defining Content Groups, the ContentProps and ContentGroupProps interfaces and ContentGroup class are used.

The following shows a sample Content Group with a single entry that references the ViewportContent defined above. The Content Group is loaded and registered into ConfigurableUiManager and can be referenced by its id by any Frontstage.

const one2dIModelViewport: ContentGroupProps = {
  id: "one2dIModelViewport",
  contents: [
    {
      classId: ViewportContent,
    },
  ],
};

const contentGroup = new ContentGroup(one2dIModelViewport);
ConfigurableUiManager.loadContentGroup(contentGroup);

The following shows a sample with two entries that reference the ViewportContent and TableContent defined above. applicationData is defined for each content control, which is provided to the ContentControl constructor via the options parameter.

contentGroup = new ContentGroup({
  contents: [
    {
      classId: ViewportContent,
      applicationData: {
        viewId: this.viewIds[0],
        iModelConnection: NineZoneSampleApp.store.getState().sampleAppState!.currentIModelConnection,
        rulesetId: this._rulesetId,
      },
    },
    {
      classId: TableContent,
      applicationData: {
        iModelConnection: NineZoneSampleApp.store.getState().sampleAppState!.currentIModelConnection,
        rulesetId: this._rulesetId,
      },
    }
  ],
});

Defining Content Layouts

When defining Content Layouts, the ContentLayoutProps interface and ContentLayoutDef class are used. The ContentLayoutDef can be referenced directly by a Frontstage or it may be registered and referenced by id. The Content Layout uses index numbers to reference content within a Content Group. Both the Content Layout and the Content Group are provided as properties to a Frontstage.

A single view

The following shows a sample layout with a single piece of content. The Content Layout is loaded and registered into ConfigurableUiManager and can be referenced by its id by any Frontstage.

const singleContent: ContentLayoutProps = {
  id: "SingleContent",
};

const contentLayoutDef = new ContentLayoutDef(singleContent);
ConfigurableUiManager.loadContentLayout(contentLayoutDef);

Two views, one beside the other

The following shows a sample layout with two pieces of content that are side by side, sized evenly and divided by a vertical splitter. The left content references index 0 in the Content Group and the right content references index 1 in the Content Group.

const twoHalvesVertical: ContentLayoutProps = {
  id: "TwoHalvesVertical",
  verticalSplit: { percentage: 0.50, left: 0, right: 1 },
};

Two views, one above the other

The following shows a sample layout with two pieces of content, one above the other, sized evenly and divided by a horizontal splitter. The top content references index 0 in the Content Group and the bottom content references index 1 in the Content Group.

const twoHalvesHorizontal: ContentLayoutProps = {
  id: "TwoHalvesHorizontal",
  horizontalSplit: { percentage: 0.50, top: 0, bottom: 1 },
};

Three views, one on the left, two stacked on the right

The following shows a sample layout with three pieces of content. The left side takes up half of the window, and the right side takes up the other half. The right side displays two pieces of content, one above the other and are sized evenly. The left content references index 0 in the Content Group, the top content references index 1, and the bottom content references index 2 in the Content Group.

const threeRightStacked: ContentLayoutProps = {
  id: "ThreeRightStacked",
  verticalSplit: {
    percentage: 0.50,
    left: 0,
    right: { horizontalSplit: { percentage: 0.50, top: 1, bottom: 2 } },
  },
};

Four views laid out in quadrants

The following shows a sample layout with four pieces of content. There is a top half and a bottom half. Each of these halves contain two pieces of content that are side by side and sized evenly.

const fourQuadrants: ContentLayoutProps = {
  id: "FourQuadrants",
  horizontalSplit: {
    percentage: 0.50,
    top: { verticalSplit: { percentage: 0.50, left: 0, right: 1 } },
    bottom: { verticalSplit: { percentage: 0.50, left: 2, right: 3 } },
  },
};

API Reference

• Content Views

Last Updated: 12 June, 2024