How to control layer-visibilty individually with LayerTemplate

Question

We are using ArcGIS Runtime .NET 10.2.6 and the legend-control in ArcGIS Runtime Toolkit for Windows Desktop. We are trying to add a checkbox to each subLayer from a DynamicMapService to switch visibility. We've been able to add a checkbox defined in a LayerTemplate. So far, we have (based on the runtime .NET sample "LegendsInTreeViewSample): In line 5 the binding of the property "Label" works fine, it shows the layers lable. Unfortunately it doesn't work with the property "IsEnabled": if one checkbox is cheked/unchecked, all other layers on the same level are also affected . Has anyone experienced similar behavior? Is there a workaround to achieve the desired behavior? Thanks in advance, Fabian

FabianDeffert · Answer

It's been a while, but we cretaed a workaround to make the legend work as desired, at least in our case. We added a IValueConverter for IsChecked-Property of the CheckBox: The converter: public sealed class LayerItemViewModelToVisibilityConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo culture) { LayerItemViewModel _vmodel = value as LayerItemViewModel; if (_vmodel as LayerItemViewModel == null) return true; ArcGISDynamicMapServiceLayer _layerParent = _vmodel.Layer as ArcGISDynamicMapServiceLayer; if (_layerParent == null) return true; bool isVisible = true; int subID = _vmodel.SubLayerID; if (_layerParent.VisibleLayers != null) { if (!_layerParent.VisibleLayers.Contains(subID)) isVisible = false; } return isVisible; } public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) { throw new NotImplementedException(); } } And in code-behind the checked and unchecked-events of the CheckBox: private void chkLayerTemplate_Checked(object sender, RoutedEventArgs e) { if (!(sender is CheckBox)) return; Esri.ArcGISRuntime.Toolkit.Controls.Primitives.LayerItemViewModel _layerVM = ((CheckBox)sender).Tag as Esri.ArcGISRuntime.Toolkit.Controls.Primitives.LayerItemViewModel; if (_layerVM == null) return; ArcGISDynamicMapServiceLayer _layerParent = _layerVM.Layer as ArcGISDynamicMapServiceLayer; if (_layerParent == null) return; var subId = _layerVM.SubLayerID; if (_layerParent.VisibleLayers != null) { if (!_layerParent.VisibleLayers.Contains(subId)) _layerParent.VisibleLayers.Add(subId); } } private void chkLayerTemplate_UnChecked(object sender, RoutedEventArgs e) { if (!(sender is CheckBox)) return; Esri.ArcGISRuntime.Toolkit.Controls.Primitives.LayerItemViewModel _layerVM = ((CheckBox)sender).Tag as Esri.ArcGISRuntime.Toolkit.Controls.Primitives.LayerItemViewModel; if (_layerVM == null) return; ArcGISDynamicMapServiceLayer _layerParent = _layerVM.Layer as ArcGISDynamicMapServiceLayer; if (_layerParent == null) { ((CheckBox)sender).IsChecked = true; //no other types return; } var subId = _layerVM.SubLayerID; if (_layerParent.VisibleLayers != null) { if (_layerParent.VisibleLayers.Contains(subId)) _layerParent.VisibleLayers.Remove(subId); } }

BrianFoley1 · Answer

Fabian, did you ever get this to work ?

BrianFoley1 · Answer

I have the same question as you.  Only, I am trying to show checkboxes on all the lowest levels in the legends.  Did you ever get this to work ?

--Brian