Class Layer

Create layer with name

Inheritance
object
BaseLayer
Layer
Implements
Inherited Members
Namespace: Mapsui.Layers
Assembly: Mapsui.dll
Syntax
public class Layer : BaseLayer, ILayer, IAnimatable, INotifyPropertyChanged, IDisposable, IFetchableSource, ILayerDataSource<IProvider>

Constructors

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Layer()

Create a new layer

Declaration
public Layer()
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Layer(string)

Create layer with name

Declaration
public Layer(string layerName)
Parameters
Type Name Description
string layerName

Name to use for layer

Properties

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Animations

Declaration
public List<Func<bool>> Animations { get; }
Property Value
Type Description
List<Func<bool>>
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DataSource

Data source for this layer

Declaration
public IProvider? DataSource { get; set; }
Property Value
Type Description
IProvider
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Extent

Returns the extent of the layer

Declaration
public override MRect? Extent { get; }
Property Value
Type Description
MRect

Bounding box corresponding to the extent of the features in the layer
Overrides

Methods

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ClearCache()

Clears the cache of this layer. Call this if source data has was invalidated or the layer is removed.

Declaration
public void ClearCache()
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FetchAsync(FetchInfo, int)

Declaration
public Task FetchAsync(FetchInfo fetchInfo, int refreshCounter)
Parameters
Type Name Description
FetchInfo fetchInfo
int refreshCounter
Returns
Type Description
Task
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GetFeatures(MRect, double)

Get all features in a given MRect for a given resolution

Declaration
public override IEnumerable<IFeature> GetFeatures(MRect extent, double resolution)
Parameters
Type Name Description
MRect extent

Bounding box
double resolution

Resolution of viewport
Returns
Type Description
IEnumerable<IFeature>
Overrides
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GetFetchJobs(int, int)

Gets the fetch requests for this layer. The requests are based on the viewport stored within the layer.

Declaration
public FetchJob[] GetFetchJobs(int activeFetches, int availableFetchSlots)
Parameters
Type Name Description
int activeFetches
int availableFetchSlots

Number of available fetch slots in the caller. It is the maximum number of fetch jobs the method should return.
Returns
Type Description
FetchJob[]
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OnFetchRequested()

Declaration
protected virtual void OnFetchRequested()
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UpdateAnimations()

Declaration
public override bool UpdateAnimations()
Returns
Type Description
bool

Returns true if animations are running and a graphics update is needed.
Overrides
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ViewportChanged(FetchInfo)

Informs the layer that the viewport has changed and it should update its data accordingly.

Declaration
public void ViewportChanged(FetchInfo fetchInfo)
Parameters
Type Name Description
FetchInfo fetchInfo

Events

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FetchRequested

Indicates to the listener that it should fetch data again. This event is raised when there was a change in source data, so only relevant for dynamic data. The fetches triggered by viewport changes do not depend on it.

Declaration
public event EventHandler<FetchRequestedEventArgs>? FetchRequested
Event Type
Type Description
EventHandler<FetchRequestedEventArgs>

Implements

Extension Methods