Widgets

A Widget is a collection of UI components tied to a particular zone that allows the user to view and/or modify data relevant to their current context. A Widget is hosted in either a Zone or StagePanel that are part of a Frontstage. The Widget React component is listed in the widgets Prop of a Zone React component or a StagePanel React component.

A label for the Widget may be specified using the label or labelKey prop. An icon may be specified using the iconSpec prop. The defaultState prop specifies the default state, which defaults to WidgetState.Open. An id prop may optionally be used to set an Id on a Widget that can be used to find the widget.

The content of the widget is ultimately a React component. The content may be specified for the Widget component two different ways: a WidgetControl or a React component. The control prop specifies a WidgetControl and the element prop specifies a React component. A WidgetControl contains a reactNode property, which is where the React component is specified. A WidgetControl is useful if you need to centralize some logic pertaining to the widget but outside the React component for the widget.

A widget may be either rectangular or free-form, and the isFreeform prop indicates this. The default is rectangular. A widget may be used for the Tool Settings or the Status Bar, and the isToolSettings and isStatusBar props indicates this. The default is false for both.

To make the widget fill the available space in the zone, set the fillZone prop to true.

The applicationData prop specifies JSON data attached to the Widget and WidgetDef.

The syncEventIds and stateFunc props may be used to set the state of the widget based on certain events and criteria. See SyncUi for more details.

Example Widget component listed in a Zone component

The following example shows a single Widget component in the center-right zone. An icon and label are specified. The widget is to fill the available space in the zone. The content of the widget comes from a TreeWidget class that subclasses WidgetControl. applicationData is defined, which is provided to the WidgetControl constructor via the options parameter.

centerRight={
  <Zone defaultState={ZoneState.Minimized} allowsMerging={true}
    widgets={[
      <Widget iconSpec="icon-tree" labelKey="NineZoneSample:components.tree" fillZone={true}
        control={TreeWidget}
        applicationData={{
          iModelConnection: NineZoneSampleApp.store.getState().sampleAppState!.currentIModelConnection,
          rulesetId: this._rulesetId,
        }}
      />,
    ]}
  />

Popout Widget Support

Starting in version 2.17 Widgets can specify if they support being "popped-out" to a child window by setting the AbstractWidgetProps property canPopout to true. This option must be explicitly set because the property reactNode must return React components that works properly in a child window. At minimum components should typically not use the window or document property to register listeners as these listener will be registered for events in the main window and not in the child window. Components will need to use the ownerDocument and ownerDocument.defaultView properties to retrieve document and window properties for the child window. Below is an example of a widget specification that can be "popped-out".

  <Widget id="RightStart2" canPopout={true} label="Example Widget" defaultState={WidgetState.Open} element={<ComponentThatSupportsPopout>} />,

As long as the application is using AppUi version "2" or later, a "pop-out" icon will be shown along side the widget tab(s) if the active widget tab has its canPopout property set to true. When this icon is pressed the contents of the widget tab will be moved from the widget panel to an independent child window that can be moved to a secondary monitor. If the user closes a "popped-out" widget it will be re-docked in the widget panel. For security reasons, browsers do not allow javascript to automatically open popup windows, so when the current page unloaded and returned to at a later time, any "popped-out" widgets are converted to floating widgets. These floating widgets can be "popped-out" again using the same "pop-out" icon. Some browsers, like Firefox, will return the popout to it last position, and other browser, like Chrome, will force the popup window to be on same screen as main browser window. If the application is an Electron-based application, the "popped-out" widgets will be restored without being converted to floating widgets.

WidgetControls

A subclass of WidgetControl may be used to populate a widget. The reactNode property specifies the React component. The options parameter in the constructor contains the applicationData from the Widget component. The setWidgetState method may be called to set the state of the widget.

import * as React from "react";

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

import SimpleTreeComponent from "../components/Tree";

/** A widget control for displaying the Tree React component */
export class TreeWidget extends WidgetControl {
  constructor(info: ConfigurableCreateInfo, options: any) {
    super(info, options);

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

WidgetDefs

A WidgetDef object is created for each Widget component in the frontstage. The WidgetDef contains properties and methods used to get information and change the state of the widget.

The following example demonstrates how to open a widget programmatically. The example assumes an id prop of "VerticalPropertyGrid" has been provided on the Widget component.

const activeFrontstageDef = FrontstageManager.activeFrontstageDef;
if (activeFrontstageDef) {
  const widgetDef = activeFrontstageDef.findWidgetDef("VerticalPropertyGrid");
  if (widgetDef) {
    widgetDef.setWidgetState(WidgetState.Open);
  }
}

Tool Widget

The Tool Widget is shown in the top left of the content area and typically holds tools to manipulate or interrogate content. The horizontal toolbar often includes context specific tools based on select items. The vertical toolbar typically contain a more fixed list of tools.

The following example show the standard way to define a Tool Widget with some standard tools.

function SampleToolWidget () {
  const horizontalItems: CommonToolbarItem[] = ToolbarHelper.createToolbarItemsFromItemDefs([
    CoreTools.clearSelectionItemDef,
    SelectionContextToolDefinitions.hideElementsItemDef,
    SelectionContextToolDefinitions.isolateElementsItemDef,
    SelectionContextToolDefinitions.emphasizeElementsItemDef,
  ]);
  const verticalItems: CommonToolbarItem[] = ToolbarHelper.createToolbarItemsFromItemDefs([
    CoreTools.selectElementCommand,
    CoreTools.measureToolGroup,
    CoreTools.sectionToolGroup
    ]);

  return (
    <ToolWidgetComposer
      cornerItem={<BackstageAppButton />}
      horizontalToolbar={<ToolbarComposer items={horizontalItems} usage={ToolbarUsage.ContentManipulation} orientation={ToolbarOrientation.Horizontal} />}
      verticalToolbar={<ToolbarComposer items={verticalItems} usage={ToolbarUsage.ContentManipulation} orientation={ToolbarOrientation.Vertical} />}
    />
  );

There is an extensible Tool Widget named BasicToolWidget in the ui-framework package. It supports the specification of additional horizontal and vertical toolbar items via props. It provides basic selection and measuring tools and supports the specification of additional horizontal and vertical toolbar items via props.

Navigation Widget

The Navigation widget is shown in the top right of the content area and typically holds tools to visually navigate, orient, and zoom to specific content. The Navigation Widget supports both a horizontal and vertical toolbar. At the top right corner of the widget a Navigation aid can be displayed. The navigation aid is typically used to show the orientation or position of the view within the project.

The following example show the standard way to define a Navigation Widget.

function SampleNavigationWidget () {
  const horizontalItems: CommonToolbarItem[] = ToolbarHelper.createToolbarItemsFromItemDefs([
    CoreTools.rotateViewCommand,
    CoreTools.panViewCommand,
    CoreTools.fitViewCommand,
    CoreTools.windowAreaCommand,
    CoreTools.viewUndoCommand,
    CoreTools.viewRedoCommand,
  ]);
  const verticalItems: CommonToolbarItem[] = ToolbarHelper.createToolbarItemsFromItemDefs([
    CoreTools.walkViewCommand,
    CoreTools.toggleCameraViewCommand,
    ]);

  return (
    <NavigationWidgetComposer
      horizontalToolbar={<ToolbarComposer items={horizontalItems} usage={ToolbarUsage.ViewNavigation} orientation={ToolbarOrientation.Horizontal} />}
      verticalToolbar={<ToolbarComposer items={verticalItems} usage={ToolbarUsage.ViewNavigation} orientation={ToolbarOrientation.Vertical} />}
    />
  );

There is an extensible Navigation Widget named BasicNavigationWidget in the ui-framework package. It provides basic view manipulation tools and supports the specification of additional horizontal and vertical toolbar items via props.

API Reference

• Widget

Last Updated: 29 November, 2022