stealth clothing (#19397)

Co-authored-by: deltanedas <@deltanedas:kde.org>

Content.Shared/Clothing/Components/StealthClothingComponent.cs

@@ -0,0 +1,43 @@
+using Content.Shared.Actions;
+using Content.Shared.Actions.ActionTypes;
+using Content.Shared.Clothing.EntitySystems;
+using Robust.Shared.GameStates;
+
+namespace Content.Shared.Clothing.Components;
+
+/// <summary>
+/// Adds StealthComponent to the user when enabled, either by an action or the system's SetEnabled method.
+/// </summary>
+[RegisterComponent, NetworkedComponent, AutoGenerateComponentState(true), Access(typeof(StealthClothingSystem))]
+public sealed partial class StealthClothingComponent : Component
+{
+    /// <summary>
+    /// Whether stealth effect is enabled.
+    /// </summary>
+    [DataField("enabled"), ViewVariables(VVAccess.ReadWrite), AutoNetworkedField]
+    public bool Enabled;
+
+    /// <summary>
+    /// Number added to MinVisibility when stealthed, to make the user not fully invisible.
+    /// </summary>
+    [DataField("visibility"), ViewVariables(VVAccess.ReadWrite), AutoNetworkedField]
+    public float Visibility;
+
+    /// <summary>
+    /// The action for enabling and disabling stealth.
+    /// </summary>
+    [DataField("toggleAction")]
+    public InstantAction ToggleAction = new()
+    {
+        Event = new ToggleStealthEvent()
+    };
+}
+
+/// <summary>
+/// When stealth is enabled, disables it.
+/// When it is disabled, raises <see cref="AttemptStealthEvent"/> before enabling.
+/// Put any checks in a handler for that event to cancel it.
+/// </summary>
+public sealed partial class ToggleStealthEvent : InstantActionEvent
+{
+}