Fix #65: Calling DataGrid.GetFilter() from code turns filter controls visible, even though IsAutoFilterEnabled is false.

Author: tom-englert

src/DataGridExtensions/DataGridFilterColumnControl.cs

@@ -15,6 +15,8 @@
     using DataGridExtensions.Framework;
 
     using Throttle;
+    using TomsToolbox.Wpf.Converters;
+    using BooleanToVisibilityConverter = TomsToolbox.Wpf.Converters.BooleanToVisibilityConverter;
 
     /// <summary>
     /// This class is the control hosting all information needed for filtering of one column.
@@ -24,7 +26,6 @@
     /// <seealso cref="INotifyPropertyChanged" />
     public class DataGridFilterColumnControl : Control, INotifyPropertyChanged
     {
-        private static readonly BooleanToVisibilityConverter _booleanToVisibilityConverter = new BooleanToVisibilityConverter();
         private static readonly ControlTemplate _emptyControlTemplate = new ControlTemplate();
 
         private bool _getCellContentMustUseBinding;
@@ -74,7 +75,23 @@ private void Self_Loaded(object sender, RoutedEventArgs e)
             // Bind our IsFilterVisible and Template properties to the corresponding properties attached to the
             // DataGridColumnHeader.Column property. Use binding instead of simple assignment since columnHeader.Column is still null at this point.
             var isFilterVisiblePropertyPath = new PropertyPath("(0)", DataGridFilterColumn.IsFilterVisibleProperty);
-            BindingOperations.SetBinding(this, VisibilityProperty, new Binding() { Path = isFilterVisiblePropertyPath, Source = column, Mode = BindingMode.OneWay, Converter = _booleanToVisibilityConverter });
+            var isAutoFilterEnabledPropertyPath = new PropertyPath("(0)", DataGridFilter.IsAutoFilterEnabledProperty);
+
+            BindingOperations.SetBinding(this, VisibilityProperty, new MultiBinding()
+            {
+                Converter = new CompositeMultiValueConverter()
+                {
+                    MultiValueConverter = LogicalMultiValueConverter.And,
+                    Converters = {
+                        TomsToolbox.Wpf.Converters.BooleanToVisibilityConverter.Default
+                    }
+                },
+                Bindings =
+                {
+                    new Binding() { Path = isFilterVisiblePropertyPath, Source = column, Mode = BindingMode.OneWay },
+                    new Binding() { Path = isAutoFilterEnabledPropertyPath, Source = DataGrid, Mode = BindingMode.OneWay }
+                }
+            }); ;
 
             var templatePropertyPath = new PropertyPath("(0)", DataGridFilterColumn.TemplateProperty);
             BindingOperations.SetBinding(this, TemplateProperty, new Binding() { Path = templatePropertyPath, Source = column, Mode = BindingMode.OneWay });

src/DataGridExtensions/DataGridFilterHost.cs

@@ -100,14 +100,14 @@ internal void Enable(bool value)
         {
             _isFilteringEnabled = value;
 
-            var visibility = value ? Visibility.Visible : Visibility.Hidden;
-
-            foreach (var control in FilterColumnControls)
+            if (!value)
             {
-                control.Visibility = visibility;
+                Clear();
+            }
+            else
+            {
+                EvaluateFilter();
             }
-
-            EvaluateFilter();
         }
 
         /// <summary>

src/DataGridExtensionsSample/Views/BasicView.xaml.cs

@@ -24,6 +24,7 @@ public BasicView()
                 // Sample to manipulate the filter values by code.
                 DataGrid.Columns[0].SetFilter("True");
                 DataGrid.Columns[2].SetFilter("3");
+                DataGrid.Columns[3].SetIsFilterVisible(false);
             }));
 
             // Sample usage of the filtering event