Filtering reagents (#18211)

* Making it work

* Refactoring

* Autoformat revert

* Implementing suggestions

* Changed to file scoped namespaces.

Content.Client/Guidebook/Controls/GuideReagentEmbed.xaml.cs

@@ -3,6 +3,7 @@ using System.Linq;
 using Content.Client.Chemistry.EntitySystems;
 using Content.Client.Guidebook.Richtext;
 using Content.Client.Message;
+using Content.Client.UserInterface.ControlExtensions;
 using Content.Shared.Chemistry.Reaction;
 using Content.Shared.Chemistry.Reagent;
 using JetBrains.Annotations;
@@ -20,7 +21,7 @@ namespace Content.Client.Guidebook.Controls;
 ///     Control for embedding a reagent into a guidebook.
 /// </summary>
 [UsedImplicitly, GenerateTypedNameReferences]
-public sealed partial class GuideReagentEmbed : BoxContainer, IDocumentTag
+public sealed partial class GuideReagentEmbed : BoxContainer, IDocumentTag, ISearchableControl
 {
     [Dependency] private readonly IEntitySystemManager _systemManager = default!;
     [Dependency] private readonly IPrototypeManager _prototype = default!;
@@ -45,6 +46,16 @@ public sealed partial class GuideReagentEmbed : BoxContainer, IDocumentTag
         GenerateControl(reagent);
     }
 
+    public bool CheckMatchesSearch(string query)
+    {
+        return this.ChildrenContainText(query);
+    }
+
+    public void SetHiddenState(bool state, string query)
+    {
+        this.Visible = CheckMatchesSearch(query) ? state : !state;
+    }
+
     public bool TryParseTag(Dictionary<string, string> args, [NotNullWhen(true)] out Control? control)
     {
         control = null;