Adding event TogglingRadio(Player, RadioItem, bool, bool)

Exiled.Events/EventArgs/Player/TogglingRadioEventArgs.cs

@@ -0,0 +1,67 @@
+// -----------------------------------------------------------------------
+// <copyright file="TogglingRadioEventArgs.cs" company="Exiled Team">
+// Copyright (c) Exiled Team. All rights reserved.
+// Licensed under the CC BY-SA 3.0 license.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Exiled.Events.EventArgs.Player
+{
+    using API.Features;
+
+    using Exiled.API.Features.Items;
+    using Interfaces;
+    using InventorySystem.Items.Radio;
+
+    /// <summary>
+    ///     Contains all information before toggling a radio.
+    /// </summary>
+    public class TogglingRadioEventArgs : IPlayerEvent, IDeniableEvent, IItemEvent
+    {
+        /// <summary>
+        ///     Initializes a new instance of the <see cref="TogglingRadioEventArgs" /> class.
+        /// </summary>
+        /// <param name="player">
+        ///     <inheritdoc cref="Player" />
+        /// </param>
+        /// <param name="radio">
+        ///     <inheritdoc cref="Radio" />
+        /// </param>
+        /// <param name="newState">
+        ///     <inheritdoc cref="NewState" />
+        /// </param>
+        /// <param name="isAllowed">
+        ///     <inheritdoc cref="IsAllowed" />
+        /// </param>
+        public TogglingRadioEventArgs(Player player, RadioItem radio, bool newState, bool isAllowed = true)
+        {
+            Player = player;
+            Radio = (Radio)Item.Get(radio);
+            NewState = newState;
+            IsAllowed = isAllowed;
+        }
+
+        /// <summary>
+        ///     Gets the <see cref="API.Features.Items.Radio" /> which is being used.
+        /// </summary>
+        public Radio Radio { get; }
+
+        /// <inheritdoc/>
+        public Item Item => Radio;
+
+        /// <summary>
+        ///     Gets a value indicating whether the radio is being turned on or off.
+        /// </summary>
+        public bool NewState { get; }
+
+        /// <summary>
+        ///     Gets or sets a value indicating whether the radio can be turned on or off.
+        /// </summary>
+        public bool IsAllowed { get; set; }
+
+        /// <summary>
+        ///     Gets the player who's using the radio.
+        /// </summary>
+        public Player Player { get; }
+    }
+}

Exiled.Events/Handlers/Player.cs

@@ -452,6 +452,11 @@ public class Player
         /// </summary>
         public static Event<TogglingOverwatchEventArgs> TogglingOverwatch { get; set; } = new();
 
+        /// <summary>
+        /// Invoked before turning the <see cref="API.Features.Items.Radio" /> on/off.
+        /// </summary>
+        public static Event<TogglingRadioEventArgs> TogglingRadio { get; set; } = new();
+
         /// <summary>
         /// Invoked before a <see cref="API.Features.Player"/> searches a Pickup.
         /// </summary>
@@ -905,6 +910,12 @@ public class Player
         /// <param name="ev">The <see cref="TogglingOverwatchEventArgs"/> instance.</param>
         public static void OnTogglingOverwatch(TogglingOverwatchEventArgs ev) => TogglingOverwatch.InvokeSafely(ev);
 
+        /// <summary>
+        /// Called before turning the radio on/off.
+        /// </summary>
+        /// <param name="ev">The <see cref="TogglingRadioEventArgs"/> instance.</param>
+        public static void OnTogglingRadio(TogglingRadioEventArgs ev) => TogglingRadio.InvokeSafely(ev);
+
         /// <summary>
         /// Called before a <see cref="API.Features.Player"/> searches a Pickup.
         /// </summary>

Exiled.Events/Patches/Events/Player/TogglingRadio.cs

@@ -0,0 +1,115 @@
+// -----------------------------------------------------------------------
+// <copyright file="TogglingRadio.cs" company="Exiled Team">
+// Copyright (c) Exiled Team. All rights reserved.
+// Licensed under the CC BY-SA 3.0 license.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Exiled.Events.Patches.Events.Player
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Reflection;
+    using System.Reflection.Emit;
+
+    using Exiled.API.Features.Items;
+    using Exiled.API.Features.Pools;
+    using Exiled.Events.Attributes;
+    using Exiled.Events.EventArgs.Player;
+
+    using HarmonyLib;
+
+    using InventorySystem.Items;
+    using InventorySystem.Items.Radio;
+
+    using PluginAPI.Events;
+
+    using static HarmonyLib.AccessTools;
+
+    /// <summary>
+    /// Patches <see cref="RadioItem.ServerProcessCmd" />.
+    /// Adds the <see cref="Handlers.Player.TogglingRadio" /> event.
+    /// </summary>
+    [EventPatch(typeof(Handlers.Player), nameof(Handlers.Player.TogglingRadio))]
+    [HarmonyPatch(typeof(RadioItem), nameof(RadioItem.ServerProcessCmd))]
+    internal static class TogglingRadio
+    {
+        private static IEnumerable<CodeInstruction> Transpiler(IEnumerable<CodeInstruction> instructions, ILGenerator generator)
+        {
+            List<CodeInstruction> newInstructions = ListPool<CodeInstruction>.Pool.Get(instructions);
+
+            Label retLabel = generator.DefineLabel();
+
+            Predicate<CodeInstruction> match = instruction => instruction.opcode == OpCodes.Newobj && (ConstructorInfo)instruction.operand == GetDeclaredConstructors(typeof(PlayerRadioToggleEvent))[0];
+            int offset = -4;
+            int index = newInstructions.FindIndex(match) + offset;
+
+            newInstructions.InsertRange(index, new[]
+            {
+                // Player.Get(this.Hub)
+                new CodeInstruction(OpCodes.Ldarg_0).MoveLabelsFrom(newInstructions[index]),
+                new(OpCodes.Call, PropertyGetter(typeof(RadioItem), nameof(RadioItem.Owner))),
+                new(OpCodes.Call, Method(typeof(API.Features.Player), nameof(API.Features.Player.Get), new[] { typeof(ReferenceHub) })),
+
+                // this
+                new(OpCodes.Ldarg_0),
+
+                // true
+                new(OpCodes.Ldc_I4_1),
+
+                // true
+                new(OpCodes.Ldc_I4_1),
+
+                // TogglingRadioEventArgs ev = new TogglingRadioEventArgs(Player, Radio, bool);
+                new(OpCodes.Newobj, GetDeclaredConstructors(typeof(TogglingRadioEventArgs))[0]),
+                new(OpCodes.Dup),
+
+                // Handlers.Player.OnTogglingRadio(ev);
+                new(OpCodes.Call, Method(typeof(Handlers.Player), nameof(Handlers.Player.OnTogglingRadio))),
+
+                // if(!ev.IsAllowed)
+                //    return;
+                new(OpCodes.Callvirt, PropertyGetter(typeof(TogglingRadioEventArgs), nameof(TogglingRadioEventArgs.IsAllowed))),
+                new(OpCodes.Brfalse_S, retLabel),
+            });
+
+            index = newInstructions.FindLastIndex(match) + offset;
+
+            newInstructions.InsertRange(index, new[]
+            {
+                // Player.Get(this.Hub)
+                new CodeInstruction(OpCodes.Ldarg_0).MoveLabelsFrom(newInstructions[index]),
+                new(OpCodes.Call, PropertyGetter(typeof(RadioItem), nameof(RadioItem.Owner))),
+                new(OpCodes.Call, Method(typeof(API.Features.Player), nameof(API.Features.Player.Get), new[] { typeof(ReferenceHub) })),
+
+                // this
+                new(OpCodes.Ldarg_0),
+
+                // false
+                new(OpCodes.Ldc_I4_0),
+
+                // true
+                new(OpCodes.Ldc_I4_1),
+
+                // TogglingRadioEventArgs ev = new TogglingRadioEventArgs(Player, Radio, bool);
+                new(OpCodes.Newobj, GetDeclaredConstructors(typeof(TogglingRadioEventArgs))[0]),
+                new(OpCodes.Dup),
+
+                // Handlers.Player.OnTogglingRadio(ev);
+                new(OpCodes.Call, Method(typeof(Handlers.Player), nameof(Handlers.Player.OnTogglingRadio))),
+
+                // if(!ev.IsAllowed)
+                //    return;
+                new(OpCodes.Callvirt, PropertyGetter(typeof(TogglingRadioEventArgs), nameof(TogglingRadioEventArgs.IsAllowed))),
+                new(OpCodes.Brfalse_S, retLabel),
+            });
+
+            newInstructions[newInstructions.Count - 1].labels.Add(retLabel);
+
+            foreach (var instruction in newInstructions)
+                yield return instruction;
+
+            ListPool<CodeInstruction>.Pool.Return(newInstructions);
+        }
+    }
+}