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SymbolLayer QML Type

A base class to represent symbol layers, which are the fundamental components used to build multilayer symbols. More...

Import Statement: import Esri.ArcGISRuntime 100.10
Since: Esri.ArcGISRuntime 100.5
Inherits:

Object

Inherited By:

FillSymbolLayer, MarkerSymbolLayer, and StrokeSymbolLayer

Properties

Signals

Methods

  • bool equals(SymbolLayer symbolLayer)

Detailed Description

The available symbol layer types correspond to the primitive geometry they are designed to render: marker layers for point, stroke layers for line, and fill layers for area. Layer types, however, are not applied exclusively to the corresponding geoelement geometry type. A marker symbol layer, for example, could be applied to a polyline feature to render its vertices. Each layer type has a unique set of properties to control its display.

A symbol can contain one or several symbol layers of the same or different type. A symbol used to render polygons, for example, might contain a fill symbol layer to render the polygon interior, a stroke symbol layer for rendering the polygon outline, and a marker symbol layer to render polygon vertices. A symbol to render a polyline might contain several stroke layers of varying widths. If a symbol contains a layer that cannot render the type of geometry to which it is applied, that symbol layer is ignored when rendering.

Symbol typeTypical symbol layersRole
Point symbolMarker layersDraw relative to the point geometry
Polyline SymbolMarker layersDraw at specified locations relative to the line geometry
Stroke layersDraw relative to the line geometry
Polygon SymbolMarker layersDraw relative to the polygon outline or in the interior, depending on placement setting
Stroke layersDraw relative to the polygon outline
Fill layersDraw relative to the polygon interior

A symbol can contain one or several symbol layers of the same or different type. A symbol used to render polygons, for example, might contain a fill symbol layer to render the polygon interior, a stroke symbol layer for rendering the polygon outline, and a marker symbol layer to render polygon vertices. A symbol to render a polyline might contain several stroke layers of varying widths. If a symbol contains a layer that cannot render the type of geometry to which it is applied, that symbol layer is ignored when rendering.

Symbol and layer property interaction

Most SymbolLayer properties are only accessible on the symbol layer. However, there are some properties that are also exposed for the symbol as a whole. Properties such as color and size, for example, can be modified either for an individual symbol layer, or for the symbol itself. For such properties, the value provided for the symbol may have an effect on the corresponding property for the symbol layers it contains. Similarly, the property value for a multilayer symbol might be determined from the values of the individual symbol layers it contains. There are no notifications from a symbol or symbol layer when a property has been changed. If your app needs to respond to property changes in a symbol (as a result of a propagated change, for example) you will need to reread property values to identify changes.

Unknown symbol layers or properties

The multilayer symbol specification is complex and continues to evolve outside of ArcGIS Runtime. The potential exists that some symbol layers (or properties) will not expose an API or will not be known by ArcGIS Runtime. Depending on the problem encountered, ArcGIS Runtime will handle this situation in one of the following ways:

  • If ArcGIS Runtime reads a symbol that it can render, but for which no public API is exposed, the base class for the appropriate symbol layer is returned in the layer collection.
  • The multilayer symbology specification for an existing symbol layer type might be updated to include properties that are not recognized by ArcGIS Runtime. When reading such a symbol layer, ArcGIS Runtime attempts to create it with the properties it understands. The symbol layer renders, but properties that cannot be identified are ignored.
  • In the event that a new (unrecognized) symbol layer is encountered by ArcGIS Runtime, the symbol is ignored and is not added to the symbol layer collection.

Property Documentation

colorLocked : bool

Returns if the symbol layer is color locked.

Any symbol layer that is color locked will not change color when the symbol color is changed. However, changing the color of the symbol layer directly would change the color of the symbol layer irrespective of the property value.


enabled : bool

Returns if the symbol layer is enabled.

A symbol layer will only be rendered if it is enabled.


symbolLayerType : Enums.SymbolLayerType

Returns the symbol layer type.

See also Enums.SymbolLayerType.


Signal Documentation

colorLockedChanged()

Emitted when the colorLocked property changes.

Note: The corresponding handler is onColorLockedChanged.


enabledChanged()

Emitted when the enabled property changes.

Note: The corresponding handler is onEnabledChanged.


Method Documentation

bool equals(SymbolLayer symbolLayer)

Returns whether the provided symbolLayer is equal to this SymbolLayer.



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