TdxMapControlAzureMapImageryDataProvider.BeginUpdate Method
Postpones all requests to Azure Maps servers until an EndUpdate procedure call.
#Declaration
Delphi
procedure BeginUpdate;
#Remarks
Every time you change a tile provider’s settings (for example, change the active tileset), the provider sends a request to Azure servers to download corresponding data. Enclose multiple provider setting changes between BeginUpdate
and EndUpdate procedure calls to avoid excessive data requests and improve performance.
Note
Ensure that every Begin
procedure call is followed by an End
#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;
See Also