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CalloutData Class | ArcGIS Maps SDK for Qt

This class works in conjunction with the Callout view in the ArcGIS Maps SDK Toolkit, which is used to display information on a map. CalloutData provides the Callout with the content to display in the view and the screen coordinates detailing where to display the view. The content of the callout consists of a title and a detail string. It can also display an image to the left of the title and detail, and an accessory button to the right. The accessory button can be used to present a secondary view with more details, such as a pop up.

A Callout can be displayed for several different scenarios:

• To display the coordinates where a user tapped on the map. To do this, you could setLocation to where the tap occurred, setTitle to "Location", setDetail to a string containing the map coordinates, and setVisible to true, so the Callout will display.
• To display information about a GeoElement that has been identified on the MapView. To do this, you could setGeoElement to the GeoElement that has been identified, setTitle to one of the GeoElement's fields, setImageUrl to a swatch of the GeoElement's symbol, and setVisible to true, so the Callout will display.
• To display a callout at your current location. To do this, setShowCalloutForLocationDisplay to true, setTitle to "Current Location", setDetail to a string containing your current location, and setVisible to true, so the Callout will display.

Obtain CalloutData from MapView::calloutData. You can change the content of the callout by setting properties on this class. To change the look and feel of the Callout view, set properties on the Callout in the toolkit.

In order to use the CalloutData with a QML UI, the CalloutData class must be registered as a QML Type. For example, the following line could be added to the main.cpp to register the class under the Esri.Samples namespace:

qmlRegisterUncreatableType<CalloutData>("Esri.Samples", 1, 0, "CalloutData", "CalloutData is an uncreatable type");

Note: The default Callout provided with the toolkit is built with Qt Quick for a QML UI. If using Qt Widgets, a custom Widgets UI could be created to consume the information provided by CalloutData.

Example:

Initialize the CalloutData so the QML property is updated:

m_mapView->calloutData()->setVisible(false);
m_mapView->calloutData()->setTitle("Location");
QImage image(":/Samples/DisplayInformation/ShowCallout/RedShinyPin.png");
m_mapView->calloutData()->setImage(image);

Finally, set the CalloutData to the Callout view component from the Toolkit:

Callout {
    id: callout
    calloutData: mapView.calloutData // bind to the property that is exposed
    accessoryButtonVisible: false
    leaderPosition: Callout.LeaderPosition.Automatic
}

Relevant samples:

• Display clusters: Display a web map with a point feature layer that has feature reduction enabled to aggregate points into clusters.
• Reverse geocode: Use an online service to find the address for a tapped point.
• Show callout: Show a callout with the latitude and longitude of user-tapped points.

Destructor.

Emitted when the detail property changes.

Note: Notifier signal for property detail.

Returns an Arcade expression used for evaluating the detail text based on attributes in the GeoElement.

This function was introduced in Esri::ArcGISRuntime 200.4.

See also detail and setDetailExpression.

Gets the GeoElement for which the callout should be displayed.

If you specify the optional tapLocation parameter, the callout displays at the point on the geometry nearest to tapLocation.

Note: Only supports Feature and Graphic GeoElements.

See also setGeoElement().

The callout image returned as a QImage.

See also setImage().

Emitted when the imageUrl property changes.

Note: Notifier signal for property imageUrl.

Gets whether the callout is being shown for the LocationDisplay on the map.

Returns true if the callout will display at the current location.

Gets the map location where the callout should be displayed.

See also setLocation().

Emitted when the screenPoint property changes.

Note: Notifier signal for property screenPoint.

Sets the detail text for the callout to detail.

Note: Setter function for property detail.

See also detail().

Sets the Arcade expression to evaluate and show the callout detail.

detailExpression is an Arcade expression used to evaluate the detail text based on attributes in the GeoElement. Set DynamicEntity to setGeoElement in order to evaluate the expression and update the attributes realtime in callout detail.

Use the attributes of the dynamic entity to form the detailExpression and pass to setDetailExpression(const QString&). For example, to show the callout detail based on the attribute values of dynamic entity, form the detailExpression as follows: concatenate(Round($feature.point_x,6), \",\", Round($feature.point_y,6),\" Heading: \",$feature.heading,\"°\"). Note: Dynamic entity is set to $feature in the profile variable. Then set setVisible to true to show the callout.

The result will be stored in detail after the detailExpression evaluation. The expression is re-evaluated every time the dynamic entity's DynamicEntity::dynamicEntityChanged signal is emitted, and the callout title is updated in real-time when it moves along with the dynamic entity. If both detail and detailExpression are provided, detail will be overwritten by the evaluated detailExpression result.

This function was introduced in Esri::ArcGISRuntime 200.4.

See also detailExpression and detail.

Sets the GeoElement for the callout geoElement.

See also geoElement().

Sets the image for the callout.

The image can be set by either specifying the QImage or by a URL using the setImageUrl method. It overwrites a previously set imageUrl.

See also image().

Sets the imageUrl for the callout.

The URL can either be to a local file or an online resource.

Note: Setter function for property imageUrl.

See also imageUrl().

Sets the location of the callout display to location.

See also location().

Sets whether the callout is being shown for the LocationDisplay on the map.

Set calloutForLocationDisplay to true if you want the callout to be displayed for your current location.

See also isShowCalloutForLocationDisplay().

Sets the tap location for the callout to tapLocation.

If the callout is shown for a GeoElement, tapLocation specifies the optional location where the callout should be displayed.

See also tapLocation().

Sets the title text for the callout to title.

Note: Setter function for property title.

See also title().

Sets an Arcade expression to evaluate and show the callout title.

titleExpression is an Arcade expression used to evaluate the title text based on attributes in the GeoElement. Set DynamicEntity to setGeoElement in order to evaluate the expression and update the title realtime in callout.

Use the attributes of dynamic entity to form the titleExpression and pass to setTitleExpression(const QString&). For example, to show the callout title based on the attributes of dynamic entity, form the titleExpression as follows: concatenate($feature.vehiclename, \": \", $feature.speed, \" mph\"). Note: Dynamic entity is set to $feature in the profile variable. Then set setVisible to true to show the callout.

The result will be stored in title after the titleExpression evaluation. The expression is re-evaluated every time the dynamic entity's DynamicEntity::dynamicEntityChanged signal is emitted, and the callout title is updated in real-time when it moves along with the dynamic entity. If both title and titleExpression are provided, title will be overwritten by the evaluated titleExpression result.

This function was introduced in Esri::ArcGISRuntime 200.4.

See also titleExpression and title.

Sets the callout to be visible or invisible.

Note: Setter function for property visible.

See also isVisible().

Gets the tap location for the callout.

See also setTapLocation().

Emitted when the title property changes.

Note: Notifier signal for property title.

Returns an Arcade expression used for evaluating the title text based on the attributes in the GeoElement.

This function was introduced in Esri::ArcGISRuntime 200.4.

See also setTitleExpression(), title, and titleExpression.

Emitted when the visible property changes.

Note: Notifier signal for property visible.

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