IMap.IsEmpty

Syntax

IsEmpty: Boolean;

Description

The IsEmpty property returns whether a map is loaded.

Comments

The property is read-only.

Available values:

True. The map is not loaded.
False - the map is loaded.

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;
Begin
    Map := UiMap1.Map;
    If Not Map.IsEmpty Then
        MapView := Map.View;
        TerritoryInfo := New DxMapTerritoryInfo.Create;
        TerritoryInfo.Layer := Map.Layers.FindByName("Regions");
        MapView.TerritoryInfo := TerritoryInfo;
    End If;
End Sub Button1OnClick;

After executing the example the territory info for the Regions layer is displayed, if the map is loaded.