Class FontSourceCache

Cache that stores loaded font bytes keyed by Mapsui.Styles.FontSource.SourceId. It implements IFetchableSource so that the DataFetcher automatically populates it when the viewport changes, including during RefreshDataAsync(Viewport?). Accessed via FontSourceCache.

Inheritance
object
FontSourceCache
Implements
Inherited Members
Namespace: Mapsui.Styles
Assembly: Mapsui.dll
Syntax
public sealed class FontSourceCache : IFetchableSource

Properties

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Id

The layer identifier.

Declaration
public int Id { get; }
Property Value
Type Description
int

Methods

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ClearCache()

Clears all cached font bytes and requests a new fetch cycle.

Declaration
public void ClearCache()
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FetchAllFontDataAsync()

Fetch all font sources that have been declared but not yet loaded. This variant is currently only used in tests.

Declaration
public Task FetchAllFontDataAsync()
Returns
Type Description
Task
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Get(FontSource)

Get cached font bytes for the given FontSource, or null if not yet loaded.

Declaration
public byte[]? Get(FontSource fontSource)
Parameters
Type Name Description
FontSource fontSource
Returns
Type Description
byte[]
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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 activeFetchCount, int availableFetchSlots)
Parameters
Type Name Description
int activeFetchCount

Number of active fetches for this layer. It is relevant if the layer itself has a maximum on the number of active fetches for itself.
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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TryRegisterAsync(string, string)

Fetch and cache the bytes for a single font source. Returns false if it was already registered.

Declaration
public Task<bool> TryRegisterAsync(string sourceId, string source)
Parameters
Type Name Description
string sourceId
string source
Returns
Type Description
Task<bool>
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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