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Showing content from https://developers.arcgis.com/qt/cpp/api-reference/esri-arcgisruntime-annotationlayer.html below:

AnnotationLayer Class | ArcGIS Maps SDK for Qt

Annotation can be used to symbolize text on your maps as described in the ArcGIS Pro "Annotation" documentation. Annotation is defined using a text string, geographical location, and display properties such as font, size, and color. This information is stored in an annotation feature class in a geodatabase.

There are two kinds of annotation:

• Standard annotation is not formally associated with features in the geodatabase. An example of standard annotation is the text on a map for a mountain range. No specific feature represents the mountain range, but it is an area you want to mark. Standard annotation is read-only.
• Feature-linked annotation is associated with a specific feature in another feature class in the geodatabase. The text in feature-linked annotation reflects the value of a field or fields from the feature to which it is linked. For example, the water transmission mains in a water network can be annotated with their names, which are stored in a field in the transmission mains feature class. If you edit the attributes and/or geographical position of the feature associated with the feature-linked annotation, any changes will be applied to the annotation feature table, and visible changes to the annotation will be reflected in the MapView. If the feature-linked annotation is stored in an Enterprise server, its feature and annotation tables must contain global object ids.

You can construct an annotation layer using any of the following:

• URL or portal item of an online annotation feature class
• Feature table containing annotation features: - An online ServiceFeatureTable that has a feature layer service type of ArcGISFeatureLayerInfoServiceType::AnnotationLayer. - An offline GeodatabaseFeatureTable returned by the Geodatabase::geodatabaseAnnotationTables collection when a GenerateGeodatabaseJob has completed.

Each annotation layer is partitioned into annotation sublayers. Each annotation sublayer corresponds to the label class of the original labels that were used to publish the annotation. In ArcGIS Pro, the annotation sublayers are known as annotation classes. Annotation sublayers offer greater control over the annotation:

• An author can set different visual properties on the sublayer compared to the parent annotation layer. For example, font, size, color, or different minimum and maximum scale ranges.
• You can access the annotation sublayer metadata information, such as the legend information, and set the visibility of each annotation sublayer.

Annotation respects the reference scale defined by the map, so annotation will always be presented to the user at the correct size and position, as defined by the annotation author.

Annotation layers can be taken offline from a feature service hosted on ArcGIS Enterprise 10.7.1 or later, using the GeodatabaseSyncTask. Annotation layers are also supported in mobile map packages created in ArcGIS Pro 2.3 or later.

If your annotation feature class was created with ArcGIS Desktop, it will not display in an AnnotationLayer. To display the annotation data, you must upgrade the annotation dataset using the ArcGIS Pro Data Management tool called Upgrade Dataset before you publish it. For more information see the Managing annotation feature classes documentation.

Relevant samples:

• Control annotation sublayer visibility: Use annotation sublayers to gain finer control of annotation layer subtypes.
• Display annotation: Display annotation from a feature service URL.
• Edit features with feature-linked annotation: Edit feature attributes which are linked to annotation through an expression.

Creates a new annotation layer from a feature service table.

If the feature table does not contain annotation data then the AnnotationLayer will fail to load. ArcGISFeatureTable::layerInfo and ArcGISFeatureLayerInfo::serviceType can be checked to verify the feature type, before attempting to create a Layer.

• featureTable - a feature table ArcGISFeatureTable.
• parent - An optional parent QObject.

This function was introduced in Esri::ArcGISRuntime 100.6.

Creates a new annotation layer from a feature service URL.

• url - The URL to the feature service layer.
• parent - An optional parent QObject.

If the specified URL is not a valid ArcGIS feature service endpoint, then it will fail to load.

Creates a new annotation layer from a feature service portal item.

• item - A feature service PortalItem.
• serviceLayerId - The layer ID for which to create the layer.
• parent - An optional parent QObject.

See also Layer::item.

Destructor.

Returns the weight of annotation features when considered as barriers to labeling.

The default is LabelBarrierWeight::High.

This function was introduced in Esri::ArcGISRuntime 100.14.

See also setBarrierWeight().

Updates any selected features in the layer back to the un-selected state.

This function was introduced in Esri::ArcGISRuntime 100.12.

Returns a SQL statement where clause that stipulates a subset of features to be displayed.

The definition expression string uses the SQL-92 WHERE clause syntax: (https://en.wikipedia.org/wiki/SQL-92). The default value is an empty string, which will allow all annotation features in the data source to be used by the AnnotationLayer.

This function was introduced in Esri::ArcGISRuntime 100.12.

See also setDefinitionExpression().

Returns the feature table associated with this layer.

This function was introduced in Esri::ArcGISRuntime 100.6.

Returns the reference scale for the layer.

The reference scale of the layer is the scale at which a client should view the layer for the text to appear at its authored size.

If the client changes the viewing scale, then text will grow or shrink to keep a consistent size on the map (not the screen).

For a valid layer, the reference scale will always be a finite value, greater than zero. Until the layer is loaded, the reference scale will be zero.

Resets the visibility of the layer's features to the original visibility loaded from the data source.

This function was introduced in Esri::ArcGISRuntime 100.12.

Selects the given feature and adds it to the current list of selected features.

• feature - The feature.

This function was introduced in Esri::ArcGISRuntime 100.12.

Selects the features in the list and adds them to the current list of selected features.

• features - A QList of Feature. Contents of the QList are copied.

This function was introduced in Esri::ArcGISRuntime 100.12.

Selects the features that match the criteria in the QueryParameters object and adds them to the current list of selected features.

• parameters - The definition of the query to submit to the feature table.
• mode - Defines how the list of currently selected features will be updated
• parent - The optional parent QObject with the features returned from the query.

This method returns a QFuture for the asynchronous operation. Use future.then() to continue processing when the operation completes. Use future.onFailed() to handle exceptions of type ErrorException.

See Working with QFuture for further details.

This function was introduced in Esri::ArcGISRuntime 200.2.

Returns a list of the currently selected features.

• parent - The optional parent QObject

This method returns a QFuture for the asynchronous operation. Use future.then() to continue processing when the operation completes. Use future.onFailed() to handle exceptions of type ErrorException.

See Working with QFuture for further details.

This function was introduced in Esri::ArcGISRuntime 200.2.

Returns the layer ID that defines the layer within the feature service portal item.

See also Layer::item.

Sets the barrierWeight to barrierWeight.

This function was introduced in Esri::ArcGISRuntime 100.14.

See also barrierWeight.

Sets the definitionExpression to definitionExpression.

This function was introduced in Esri::ArcGISRuntime 100.12.

See also definitionExpression.

Sets the visibility of the given feature.

• feature - The feature.
• visible - true to show, false to hide.

This function was introduced in Esri::ArcGISRuntime 100.12.

Sets the visibility of the features in the QList.

• features - A QList of Feature. Contents of the QList are copied.
• visible - true to show, false to hide.

This function was introduced in Esri::ArcGISRuntime 100.12.

Unselects the given feature and removes it from the current list of selected features.

• feature - The feature.

This function was introduced in Esri::ArcGISRuntime 100.12.

Unselects the features in the given list and removes them from the current list of selected features.

• features - A QList of Feature. Contents of the QList are copied.

This function was introduced in Esri::ArcGISRuntime 100.12.

Reimplements: RemoteResource::url() const.

Returns the Feature Service URL for the layer.

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