IMap.BeginUpdate

Syntax

BeginUpdate;

Description

The BeginUpdate method stops map rendering.

Comments

The rendering can be resumed by calling the IMap.EndUpdate method.

Example

Executing the example requires a form with the following components: the Button component named Button1, the MapBox component named MapBox1, and the UiMap component named UiMap1. UiMap1 is a data source for MapBox1. The map must be connected to the UiMap1 component.

The example is a handler of the OnClick event for the Button1 component.

Add links to the ExtCtrls, Forms, and Map system assemblies.

Sub Button1OnClick(Sender: Object; Args: IMouseEventArgs);
Var
    Map: IMap;
    TerritoryInfo: IMapTerritoryInfo;
    MapView: IMapView;
    MapLayers: IMapLayers;
Begin
    Map := UiMap1.Map;
    MapView := Map.View;
    Map.BeginUpdate;
    TerritoryInfo := New DxMapTerritoryInfo.Create;
    MapLayers := Map.Layers;
    TerritoryInfo.Layer := MapLayers.FindByName("Regions");
    MapView.TerritoryInfo := TerritoryInfo;
    Map.EndUpdate;
End Sub Button1OnClick;

After executing the example the territory info of the Regions layer is displayed for the map. Map rendering is stopped to display the territory info.