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TdxMapLayerClass Type

A reference to a map layer class.

#Declaration

Delphi
TdxMapLayerClass = class of TdxMapLayer;

#Referenced Class

Type Description
TdxMapLayer

The base class for all map layer classes.

#Remarks

You can use the TdxMapLayerClass type to refer to the following [TdxMapLayer] class descendants:

TdxMapImageTileLayer
A map tile layer.
TdxMapItemFileLayer
An item file layer.
TdxMapItemLayer
An item layer.

#Code Example: Add a Tile Map Layer and Load Azure Maps Data

The following code example implements a procedure that accepts an Azure Maps account key, creates and configures a map tile layer, and loads data:

uses
  dxAzureMapImageryDataProvider;  // This unit declares TdxMapControlAzureMapImageryDataProvider
// ...

procedure TMyForm.AddAzureMapLayer(const AAzureKey: string);
var
  ATileLayer: TdxMapImageTileLayer;
  AProvider: TdxMapControlAzureMapImageryDataProvider;
begin
  ATileLayer := dxMapControl1.Layers.Add(TdxMapImageTileLayer) as TdxMapImageTileLayer;
  ATileLayer.ProviderClass := TdxMapControlAzureMapImageryDataProvider;
  AProvider := ATileLayer.Provider as TdxMapControlAzureMapImageryDataProvider;
  AProvider.BeginUpdate;  // Initiates the following batch change
  try
    AProvider.AzureKey := AAzureKey;  // Assigns the Azure account key
    AProvider.Tileset := TdxAzureMapTileset.Satellite;  // Changes the default tileset
    AProvider.MaxParallelConnectionCount := 8;  // Explicitly defines the number of parallel connections
  finally
    AProvider.EndUpdate;  // Calls EndUpdate regardless of the batch operation's success
  end;
end;

#Direct TdxMapLayerClass Type Reference

The TdxMapLayers.Add function accepts a TdxMapLayerClass value as the AItemClass parameter.

See Also