Merge pull request #7594 from pr8x/text-search-property

Implement `TextSearch.Text`

src/Avalonia.Controls/Primitives/SelectingItemsControl.cs

@@ -531,11 +531,23 @@ protected override void OnTextInput(TextInputEventArgs e)
 
                 _textSearchTerm += e.Text;
 
-                bool match(ItemContainerInfo info) =>
-                    info.ContainerControl is IContentControl control &&
-                    control.Content?.ToString()?.StartsWith(_textSearchTerm, StringComparison.OrdinalIgnoreCase) == true;
+                bool Match(ItemContainerInfo info)
+                {
+                    if (info.ContainerControl.IsSet(TextSearch.TextProperty))
+                    {
+                        var searchText = info.ContainerControl.GetValue(TextSearch.TextProperty);
 
-                var info = ItemContainerGenerator?.Containers.FirstOrDefault(match);
+                        if (searchText?.StartsWith(_textSearchTerm, StringComparison.OrdinalIgnoreCase) == true)
+                        {
+                            return true;
+                        }
+                    }
+
+                    return info.ContainerControl is IContentControl control &&
+                           control.Content?.ToString()?.StartsWith(_textSearchTerm, StringComparison.OrdinalIgnoreCase) == true;
+                }
+
+                var info = ItemContainerGenerator?.Containers.FirstOrDefault(Match);
 
                 if (info != null)
                 {

src/Avalonia.Controls/Primitives/TextSearch.cs

@@ -0,0 +1,37 @@
+using Avalonia.Interactivity;
+
+namespace Avalonia.Controls.Primitives
+{
+    /// <summary>
+    /// Allows to customize text searching in <see cref="SelectingItemsControl"/>.
+    /// </summary>
+    public static class TextSearch
+    {
+        /// <summary>
+        /// Defines the Text attached property.
+        /// This text will be considered during text search in <see cref="SelectingItemsControl"/> (such as <see cref="ComboBox"/>)
+        /// </summary>
+        public static readonly AttachedProperty<string> TextProperty
+            = AvaloniaProperty.RegisterAttached<Interactive, string>("Text", typeof(TextSearch));
+
+        /// <summary>
+        /// Sets the <see cref="TextProperty"/> for a control.
+        /// </summary>
+        /// <param name="control">The control</param>
+        /// <param name="text">The search text to set</param>
+        public static void SetText(Control control, string text)
+        {
+            control.SetValue(TextProperty, text);
+        }
+
+        /// <summary>
+        /// Gets the <see cref="TextProperty"/> of a control.
+        /// </summary>
+        /// <param name="control">The control</param>
+        /// <returns>The property value</returns>
+        public static string GetText(Control control)
+        {
+            return control.GetValue(TextProperty);
+        }
+    }
+}

tests/Avalonia.Controls.UnitTests/Primitives/SelectingItemsControlTests.cs

@@ -1,9 +1,11 @@
+using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Collections.Specialized;
 using System.ComponentModel;
 using System.Linq;
+using System.Reactive.Disposables;
 using Avalonia.Collections;
 using Avalonia.Controls.Presenters;
 using Avalonia.Controls.Primitives;
@@ -13,7 +15,9 @@
 using Avalonia.Input;
 using Avalonia.Interactivity;
 using Avalonia.Markup.Data;
+using Avalonia.Platform;
 using Avalonia.Styling;
+using Avalonia.Threading;
 using Avalonia.UnitTests;
 using Moq;
 using Xunit;
@@ -1895,6 +1899,54 @@ public void Handles_Removing_Last_Item_In_Controls_With_Bound_SelectedItem()
             Assert.Equal(1, carouselRaised);
         }
 
+        [Fact]
+        public void Setting_IsTextSearchEnabled_Enables_Or_Disables_Text_Search()
+        {
+            var pti = Mock.Of<IPlatformThreadingInterface>(x => x.CurrentThreadIsLoopThread == true);
+
+            Mock.Get(pti)
+                .Setup(v => v.StartTimer(It.IsAny<DispatcherPriority>(), It.IsAny<TimeSpan>(), It.IsAny<Action>()))
+                .Returns(Disposable.Empty);
+
+            using (UnitTestApplication.Start(TestServices.StyledWindow.With(threadingInterface: pti)))
+            {
+                var items = new[]
+                {
+                    new Item { [TextSearch.TextProperty] = "Foo" }, 
+                    new Item { [TextSearch.TextProperty] = "Bar" }
+                };
+
+                var target = new SelectingItemsControl
+                {
+                    Items = items, 
+                    Template = Template(), 
+                    IsTextSearchEnabled = false
+                };
+
+                Prepare(target);
+
+                target.RaiseEvent(new TextInputEventArgs
+                {
+                    RoutedEvent = InputElement.TextInputEvent,
+                    Device = KeyboardDevice.Instance, 
+                    Text = "Foo"
+                });
+
+                Assert.Null(target.SelectedItem);
+
+                target.IsTextSearchEnabled = true;
+
+                target.RaiseEvent(new TextInputEventArgs
+                {
+                    RoutedEvent = InputElement.TextInputEvent, 
+                    Device = KeyboardDevice.Instance, 
+                    Text = "Foo"
+                });
+
+                Assert.Equal(items[0], target.SelectedItem);
+            }
+        }
+
         private static void Prepare(SelectingItemsControl target)
         {
             var root = new TestRoot