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system 10.9 of 26/11/2025,
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FORESIGHT
IsDirty: Boolean;
The IsDirty property determines whether legend parameters have been changed.
Available values:
True. Legend parameters have been changed.
False. Legend parameters have not been changed. Setting the property to False allows for further detection of changes.
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 UiMap1 component must have a connected map that contains a map indicator only.
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;
Layer: IMapLayer;
Legend: IMapLegend;
Begin
Map := UiMap1.Map;
Legend := New DxMapLegend.Create As IMapLegend;
Map.View.Legend := Legend;
Legend.Visible := True;
Legend.BeginUpdate;
Layer := Map.Layers.FindByName("Regions");
Legend.Visual := Layer.Visuals.Item(0);
Legend.NoDataElementFirst := True;
Legend.NoDataElementVisible := True;
Legend.EndUpdate;
// Set whether legend has been changed
Legend.IsDirty := False;
End Sub Button1OnClick;
After executing the example the legend is displayed for the map indicator. The IsDirty property is set to False to enable detection of further changes of legend parameters.
See also: