From 6b2c531eed44dc112bda68d92dc94584bad15dbb Mon Sep 17 00:00:00 2001
From: goat <fakecake@icloud.com>
Date: Thu, 2 Apr 2020 19:59:51 +0900
Subject: [PATCH] feat: add HoveredItem data to
 Dalamud.Game.Internal.Gui.GameGui

---
 Dalamud/Game/Internal/Gui/GameGui.cs          | 41 ++++++++++++++++++-
 .../Internal/Gui/GameGuiAddressResolver.cs    |  3 +-
 2 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/Dalamud/Game/Internal/Gui/GameGui.cs b/Dalamud/Game/Internal/Gui/GameGui.cs
index 370341300..6444c0374 100644
--- a/Dalamud/Game/Internal/Gui/GameGui.cs
+++ b/Dalamud/Game/Internal/Gui/GameGui.cs
@@ -12,9 +12,23 @@ namespace Dalamud.Game.Internal.Gui {
 
         [UnmanagedFunctionPointer(CallingConvention.ThisCall)]
         private delegate IntPtr SetGlobalBgmDelegate(UInt16 bgmKey, byte a2, UInt32 a3, UInt32 a4, UInt32 a5, byte a6);
-
         private readonly Hook<SetGlobalBgmDelegate> setGlobalBgmHook;
 
+        [UnmanagedFunctionPointer(CallingConvention.ThisCall)]
+        private delegate IntPtr HandleItemHoverDelegate(IntPtr hoverState, IntPtr a2, IntPtr a3, ulong a4);
+        private readonly Hook<HandleItemHoverDelegate> handleItemHoverHook;
+
+        /// <summary>
+        /// The item ID that is currently hovered by the player. 0 when no item is hovered.
+        /// If > 1.000.000, subtract 1.000.000 and treat it as HQ
+        /// </summary>
+        public ulong HoveredItem { get; set; }
+        
+        /// <summary>
+        /// Event that is fired when the currently hovered item changes.
+        /// </summary>
+        public EventHandler<ulong> HoveredItemChanged { get; set; }
+
         public GameGui(IntPtr baseAddress, SigScanner scanner, Dalamud dalamud) {
             Address = new GameGuiAddressResolver(baseAddress);
             Address.Setup(scanner);
@@ -23,6 +37,7 @@ namespace Dalamud.Game.Internal.Gui {
 
             Log.Verbose("GameGuiManager address {Address}", Address.BaseAddress);
             Log.Verbose("SetGlobalBgm address {Address}", Address.SetGlobalBgm);
+            Log.Verbose("HandleItemHover address {Address}", Address.HandleItemHover);
 
             Chat = new ChatGui(Address.ChatManager, scanner, dalamud);
 
@@ -30,6 +45,10 @@ namespace Dalamud.Game.Internal.Gui {
                 new Hook<SetGlobalBgmDelegate>(Address.SetGlobalBgm,
                                                    new SetGlobalBgmDelegate(HandleSetGlobalBgmDetour),
                                                    this);
+            this.handleItemHoverHook =
+                new Hook<HandleItemHoverDelegate>(Address.HandleItemHover,
+                                               new HandleItemHoverDelegate(HandleItemHoverDetour),
+                                               this);
         }
 
         private IntPtr HandleSetGlobalBgmDetour(UInt16 bgmKey, byte a2, UInt32 a3, UInt32 a4, UInt32 a5, byte a6) {
@@ -40,16 +59,36 @@ namespace Dalamud.Game.Internal.Gui {
             return retVal;
         }
 
+        private IntPtr HandleItemHoverDetour(IntPtr hoverState, IntPtr a2, IntPtr a3, ulong a4) {
+            var retVal = this.handleItemHoverHook.Original(hoverState, a2, a3, a4);
+
+            if (retVal.ToInt64() == 22) {
+                var itemId = (ulong)Marshal.ReadInt32(hoverState, 0x130);
+
+                try {
+                    HoveredItemChanged?.Invoke(this, itemId);
+                } catch (Exception e) {
+                    Log.Error(e, "Could not dispatch HoveredItemChanged event.");
+                }
+
+                Log.Verbose("HoverItemId: {0}", itemId);
+            }
+
+            return retVal;
+        }
+
         public void SetBgm(ushort bgmKey) => this.setGlobalBgmHook.Original(bgmKey, 0, 0, 0, 0, 0); 
 
         public void Enable() {
             Chat.Enable();
             this.setGlobalBgmHook.Enable();
+            this.handleItemHoverHook.Enable();
         }
 
         public void Dispose() {
             Chat.Dispose();
             this.setGlobalBgmHook.Dispose();
+            this.handleItemHoverHook.Dispose();
         }
     }
 }
diff --git a/Dalamud/Game/Internal/Gui/GameGuiAddressResolver.cs b/Dalamud/Game/Internal/Gui/GameGuiAddressResolver.cs
index c0127e8d4..091543c56 100644
--- a/Dalamud/Game/Internal/Gui/GameGuiAddressResolver.cs
+++ b/Dalamud/Game/Internal/Gui/GameGuiAddressResolver.cs
@@ -9,6 +9,7 @@ namespace Dalamud.Game.Internal.Gui {
         public IntPtr ChatManager { get; private set; }
 
         public IntPtr SetGlobalBgm { get; private set; }
+        public IntPtr HandleItemHover { get; set; }
         
         public GameGuiAddressResolver(IntPtr baseAddress) {
             BaseAddress = baseAddress;
@@ -24,8 +25,8 @@ namespace Dalamud.Game.Internal.Gui {
         }
 
         protected override void Setup64Bit(SigScanner sig) {
-            //SetGlobalBgm = sig.ScanText("4C 8B 15 ?? ?? ?? ?? 4D 85 D2 74 58 41 83 7A ?? ?? 76 51 4D 8B 92 ?? ?? ?? ?? 0F B6 44 24 ?? 49 81 C2 ?? ?? ?? ?? 66 41 89 4A ?? 33 C9 41 88 52 30 41 89 4A 14 66 41 89 4A ?? 41 88 42 12 49 89 4A 38 41 89 4A 40 49 89 4A 48 41 38 4A 30 74 14 8B 44 24 28 41 89 42 40 45 89 42 38");
             SetGlobalBgm = sig.ScanText("4C 8B 15 ?? ?? ?? ?? 4D 85 D2 74 58");
+            HandleItemHover = sig.ScanText("E8 ?? ?? ?? ?? 48 8B 5C 24 ?? 48 89 AE ?? ?? ?? ??");
         }
     }
 }