From dfd5a5f3de5e5fa15524631ebce2242e2e6a53b6 Mon Sep 17 00:00:00 2001
From: Siegfried Pammer <siegfriedpammer@gmail.com>
Date: Wed, 20 Mar 2019 21:43:34 +0100
Subject: [PATCH] Add FilterableGridViewColumn.

---
 ILSpy/Controls/FilterableGridViewColumn.cs | 112 +++++++++++++++++++++
 ILSpy/ILSpy.csproj                         |   1 +
 ILSpy/themes/generic.xaml                  |  41 +++++++-
 3 files changed, 153 insertions(+), 1 deletion(-)
 create mode 100644 ILSpy/Controls/FilterableGridViewColumn.cs

diff --git a/ILSpy/Controls/FilterableGridViewColumn.cs b/ILSpy/Controls/FilterableGridViewColumn.cs
new file mode 100644
index 000000000..598fa6417
--- /dev/null
+++ b/ILSpy/Controls/FilterableGridViewColumn.cs
@@ -0,0 +1,112 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Input;
+using System.Windows.Media;
+
+namespace ICSharpCode.ILSpy.Controls
+{
+	class FilterableGridViewColumn : SortableGridViewColumn
+	{
+		static readonly ComponentResourceKey headerTemplateKey = new ComponentResourceKey(typeof(FilterableGridViewColumn), "ColumnHeaderTemplate");
+
+
+		public FilterableGridViewColumn()
+		{
+			this.SetValueToExtension(HeaderTemplateProperty, new DynamicResourceExtension(headerTemplateKey));
+		}
+
+		string filterBy;
+
+		public string FilterBy {
+			get { return filterBy; }
+			set {
+				if (filterBy != value) {
+					filterBy = value;
+					OnPropertyChanged(new PropertyChangedEventArgs("FilterBy"));
+				}
+			}
+		}
+
+		string filterFormatString;
+
+		public string FilterFormatString {
+			get { return filterFormatString; }
+			set {
+				if (filterFormatString != value) {
+					filterFormatString = value;
+					OnPropertyChanged(new PropertyChangedEventArgs("FilterFormatString"));
+				}
+			}
+		}
+
+		public static ListView GetParentView(DependencyObject obj)
+		{
+			return (ListView)obj.GetValue(ParentViewProperty);
+		}
+
+		public static void SetParentView(DependencyObject obj, ListView value)
+		{
+			obj.SetValue(ParentViewProperty, value);
+		}
+
+		public static readonly DependencyProperty ParentViewProperty =
+			DependencyProperty.RegisterAttached("ParentView", typeof(ListView), typeof(FilterableGridViewColumn), new PropertyMetadata(null));
+
+		public string FilterExpression {
+			get { return (string)GetValue(FilterExpressionProperty); }
+			set { SetValue(FilterExpressionProperty, value); }
+		}
+
+		public static readonly DependencyProperty FilterExpressionProperty =
+			DependencyProperty.Register("FilterExpression", typeof(string), typeof(FilterableGridViewColumn), new PropertyMetadata(null, OnFilterExpressionChanged));
+
+		private static void OnFilterExpressionChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
+		{
+			var header = d as FilterableGridViewColumn;
+			var view = GetParentView(header);
+			if (header == null || view == null)
+				return;
+			header.Filter(view, e.NewValue as string);
+		}
+
+		void Filter(ListView grid, string filterExpression)
+		{
+			ColumnSortDirection currentDirection = GetSortDirection(grid);
+			ICollectionView dataView = CollectionViewSource.GetDefaultView(grid.ItemsSource);
+
+			if (dataView == null) return;
+
+			string filterBy = FilterBy;
+			if (filterBy == null) {
+				Binding binding = DisplayMemberBinding as Binding;
+				if (binding != null && binding.Path != null) {
+					filterBy = binding.Path.Path;
+				}
+			}
+
+			dataView.Filter = delegate (object item) {
+				if (filterBy == null)
+					return true;
+				var pInfo = item.GetType().GetProperty(filterBy);
+				if (pInfo == null)
+					return false;
+				return Matches(filterExpression, string.Format("{0:" + FilterFormatString + "}", pInfo.GetValue(item)));
+			};
+
+			dataView.Refresh();
+		}
+
+		bool Matches(string filterExpression, string value)
+		{
+			return value?.Contains(filterExpression) == true;
+		}
+	}
+}
diff --git a/ILSpy/ILSpy.csproj b/ILSpy/ILSpy.csproj
index 9f80a9b1c..924d0a615 100644
--- a/ILSpy/ILSpy.csproj
+++ b/ILSpy/ILSpy.csproj
@@ -116,6 +116,7 @@
     <Compile Include="Controls\CustomDialog.cs">
       <SubType>Form</SubType>
     </Compile>
+    <Compile Include="Controls\FilterableGridViewColumn.cs" />
     <Compile Include="Controls\GridViewColumnAutoSize.cs" />
     <Compile Include="Controls\MarkupExtensions.cs" />
     <Compile Include="Controls\ResourceObjectTable.xaml.cs">
diff --git a/ILSpy/themes/generic.xaml b/ILSpy/themes/generic.xaml
index a72a988d5..567ba81e3 100644
--- a/ILSpy/themes/generic.xaml
+++ b/ILSpy/themes/generic.xaml
@@ -10,7 +10,7 @@
 		Displays an up arrow or down arrow in the column header when the grid is sorted using that column.
 	-->
 	<controls:ColumnSortDirectionToVisibilityConverter x:Key="ColumnSortDirectionToVisibilityConverter"/>
-	
+
 	<DataTemplate x:Key="{ComponentResourceKey {x:Type controls:SortableGridViewColumn}, ColumnHeaderTemplate}">
 		<StackPanel Orientation="Horizontal">
 			<TextBlock HorizontalAlignment="Center" Text="{Binding}"/>
@@ -26,6 +26,45 @@
 			      Data            = "M 5,5 L 10,10 L 15,5 L 5,5"/>
 		</StackPanel>
 	</DataTemplate>
+	
+	<DataTemplate x:Key="{ComponentResourceKey {x:Type controls:FilterableGridViewColumn}, ColumnHeaderTemplate}">
+		<StackPanel Orientation="Horizontal">
+			<TextBlock HorizontalAlignment="Center" Text="{Binding}"/>
+			<Path x:Name="upArrow"
+			      Visibility="{Binding Path=Column.SortDirection, ConverterParameter={x:Static controls:ColumnSortDirection.Ascending}, RelativeSource={RelativeSource AncestorType={x:Type GridViewColumnHeader}}, Converter={StaticResource ColumnSortDirectionToVisibilityConverter}}"
+			      StrokeThickness = "1"
+			      Fill            = "Gray"
+			      Data            = "M 5,10 L 15,10 L 10,5 L 5,10"/>
+			<Path x:Name="downArrow"
+			      Visibility="{Binding Path=Column.SortDirection, ConverterParameter={x:Static controls:ColumnSortDirection.Descending}, RelativeSource={RelativeSource AncestorType={x:Type GridViewColumnHeader}}, Converter={StaticResource ColumnSortDirectionToVisibilityConverter}}"
+			      StrokeThickness = "1"
+			      Fill            = "Gray"
+			      Data            = "M 5,5 L 10,10 L 15,5 L 5,5"/>
+			<CheckBox x:Name="isFilterOpen">
+				<CheckBox.Template>
+					<ControlTemplate TargetType="CheckBox">
+						<Path x:Name="filterSymbol"
+							  StrokeThickness="1"
+							  Fill="Gray"
+			                  Data="M 0,0L 20,0L 14,6L 14,12L 6,12L 6,6L 0,0"/>
+						<ControlTemplate.Triggers>
+							<Trigger Property="IsChecked" Value="True">
+								<Setter TargetName="filterSymbol" Property="Fill" Value="Gray"/>
+								<Setter TargetName="filterSymbol" Property="Stroke" Value="Transparent"/>
+							</Trigger>
+							<Trigger Property="IsChecked" Value="False">
+								<Setter TargetName="filterSymbol" Property="Fill" Value="Transparent"/>
+								<Setter TargetName="filterSymbol" Property="Stroke" Value="Gray"/>
+							</Trigger>
+						</ControlTemplate.Triggers>
+					</ControlTemplate>
+				</CheckBox.Template>
+			</CheckBox>
+			<Popup StaysOpen="True" Placement="Top" HorizontalOffset="16" IsOpen="{Binding IsChecked, ElementName=isFilterOpen}">
+				<TextBox x:Name="filter" Height="24" Width="100" Text="{Binding Path=Column.FilterExpression, UpdateSourceTrigger=PropertyChanged, RelativeSource={RelativeSource AncestorType={x:Type GridViewColumnHeader}}}" />
+			</Popup>
+		</StackPanel>
+	</DataTemplate>
 
 	<SolidColorBrush x:Key="paneBorder" Color="#828790" />