private void OnClear(object sender, EventArgs e)
{
if (MapControl == null)
{
return;
}
var map = MapControl.Map;
if (_layer != null && map.Layers.Contains(_layer))
{
map.Layers.Remove(_layer);
_layer.Dispose();
_layer = null;
}
}
/// <inheritdoc/>
protected override void OnMapControlChangedInternal(EventArgs e)
{
base.OnMapControlChangedInternal(e);
if (MapControl == null)
{
_layer.Dispose();
_layer = null;
Enabled = false;
return;
}
_geometryProvider = new Data.Providers.GeometryProvider((GeoAPI.Geometries.IGeometry)null);
_layer = new Layers.VectorLayer("_tmp_Geometries", _geometryProvider);
MapControl.ActiveToolChanged += OnMapControlActiveToolChanged;
MapControl.GeometryDefined += OnGeometryDefined;
}