feat: Add item editor with prefix picker

src/TerraSharp/Core/Hotkeys.cs

@@ -29,6 +29,7 @@ public static class Hotkeys
         new(InterfaceGroup, "ItemBrowser", "Item Browser", () => WindowManager.Toggle(WindowManager.Items)),
         new(InterfaceGroup, "BuffBrowser", "Buff Browser", () => WindowManager.Toggle(WindowManager.Buffs)),
         new(InterfaceGroup, "NpcSpawner", "NPC Spawner", () => WindowManager.Toggle(WindowManager.Npcs)),
+        new(InterfaceGroup, "ItemEditor", "Item Editor", () => WindowManager.Toggle(WindowManager.Editor)),
 
         Toggle("Player", "GodMode", "God Mode", () => Settings.GodMode, v => Settings.GodMode = v),
         Toggle("Player", "GhostMode", "Ghost Mode", () => Settings.GhostMode, v => Settings.GhostMode = v),
@@ -62,6 +63,8 @@ public static class Hotkeys
         Toggle("Items", "ItemVacuum", "Item Vacuum", () => Settings.ItemVacuum, v => Settings.ItemVacuum = v),
         Toggle("Items", "InstantBreak", "Instant Break", () => Settings.InstantBreak, v => Settings.InstantBreak = v),
         Toggle("Items", "InfItems", "Infinite Items", () => Settings.InfItems, v => Settings.InfItems = v),
+        new("Items", "MaxStack", "Max Stack", ItemFeatures.MaxStack),
+        new("Items", "Duplicate", "Duplicate Item", ItemFeatures.Duplicate),
 
         Toggle("Visuals", "Esp", "ESP", () => Settings.Esp, v => Settings.Esp = v),
         Toggle("Visuals", "Spelunker", "Spelunker Vision", () => Settings.Spelunker, v => Settings.Spelunker = v),

src/TerraSharp/Features/ItemFeatures.cs

@@ -1,5 +1,6 @@
 using Microsoft.Xna.Framework;
 using Terraria;
+using TerraSharp.UI;
 
 namespace TerraSharp.Features;
 
@@ -24,4 +25,38 @@ public static class ItemFeatures
             drop.velocity = Vector2.Zero;
         }
     }
+
+    const int InventorySlots = 50;
+
+    // The cursor item, or the held item when the cursor is empty.
+    public static Item EditTarget => Main.mouseItem.type != 0 ? Main.mouseItem : Main.LocalPlayer.inventory[Main.LocalPlayer.selectedItem];
+
+    public static void MaxStack()
+    {
+        Item item = EditTarget;
+        if (item.type == 0 || item.stack >= item.maxStack)
+            return;
+
+        item.stack = item.maxStack;
+        Widgets.Sound(7);
+    }
+
+    public static void Duplicate()
+    {
+        Item item = EditTarget;
+        Item[] inventory = Main.LocalPlayer.inventory;
+        if (item.type == 0)
+            return;
+
+        for (int i = 0; i < InventorySlots; i++)
+        {
+            if (inventory[i].type != 0)
+                continue;
+
+            inventory[i] = item.Clone();
+            inventory[i].favorited = false;
+            Widgets.Sound(7);
+            return;
+        }
+    }
 }

src/TerraSharp/UI/ItemEditor.cs

@@ -0,0 +1,222 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.Xna.Framework;
+using Terraria;
+using Terraria.ID;
+#if TMODLOADER
+using Terraria.ModLoader;
+#endif
+using TerraSharp.Features;
+
+namespace TerraSharp.UI;
+
+// Edits the cursor item, or the held item when the cursor is empty. Only type, stack and prefix survive a save.
+public sealed class ItemEditor() : Window("itemEditor", "Item Editor", new Vector2(700, 100), 480, 600)
+{
+    const int RowHeight = 30;
+
+    readonly Scroll _scroll = new();
+    readonly Item _reference = new();
+    (int Type, int Prefix) _referenceKey = (-1, -1);
+    int _x, _y, _width;
+    bool _firstGroup;
+
+    public override void OnOpen() => Main.playerInventory = true;
+
+    public override void DrawBody(Rectangle body)
+    {
+        if (Main.gameMenu)
+        {
+            Render.TextCentered(Widgets.SpriteBatch, "Enter a world to use this.", body, Widgets.Dim, 0.9f);
+            return;
+        }
+
+        // Shows and edits base stats instead of the Damage Multiplier, Rapid Attack and Instant Break overrides.
+        HeldItemOverrides.Restore();
+        Item item = ItemFeatures.EditTarget;
+        DrawHeader(body, item);
+
+        int top = body.Y + 60;
+        var inner = new Rectangle(body.X, top, body.Width, body.Bottom - top);
+        Widgets.Panel(inner, Widgets.InnerBg);
+        if (item.type == 0)
+        {
+            Render.TextCentered(Widgets.SpriteBatch, "Hold an item or pick one up with the cursor.", inner, Widgets.Dim, 0.8f);
+            return;
+        }
+
+        var area = new Rectangle(inner.X + 12, inner.Y + 8, inner.Width - 38, inner.Height - 16);
+        _y = _scroll.Begin(area);
+        int start = _y;
+        (_x, _width, _firstGroup) = (area.X, area.Width, true);
+        Reference(item);
+        DrawActions(item);
+        DrawPrefixes(item);
+        DrawStats(item);
+        _scroll.End(area, _y - start + 4);
+    }
+
+    void DrawHeader(Rectangle body, Item item)
+    {
+        var slot = new Rectangle(body.X, body.Y, 52, 52);
+        Widgets.Slot(slot, false);
+        Render.Item(Widgets.SpriteBatch, item.type, new Rectangle(slot.X + 8, slot.Y + 8, slot.Width - 16, slot.Height - 16));
+        if (item.stack > 1)
+            Render.Text(Widgets.SpriteBatch, item.stack.ToString(), new Vector2(slot.X + 8, slot.Bottom - 20), Color.White, 0.7f);
+
+        string source = Main.mouseItem.type != 0 ? "Cursor item" : "Held item";
+        Render.Text(Widgets.SpriteBatch, item.type == 0 ? "No item" : item.AffixName(), new Vector2(slot.Right + 12, body.Y + 4), item.type == 0 ? Widgets.Dim : Color.White, 0.95f);
+        Render.Text(Widgets.SpriteBatch, item.type == 0 ? source : $"{source}   #{item.type}", new Vector2(slot.Right + 12, body.Y + 30), Widgets.Dim, 0.72f);
+    }
+
+    // Defaults for the current type and prefix; right-click on a stat resets to these.
+    void Reference(Item item)
+    {
+        if (_referenceKey == (item.type, item.prefix))
+            return;
+
+        _reference.SetDefaults(item.type);
+        if (item.prefix > 0)
+            _reference.Prefix(item.prefix);
+        _referenceKey = (item.type, item.prefix);
+    }
+
+    void Group(string title)
+    {
+        if (!_firstGroup)
+            _y += 8;
+        _firstGroup = false;
+        Widgets.Text(title, new Vector2(_x, _y + 2), Widgets.Header, 0.88f);
+        float width = Render.Measure(title, 0.88f).X;
+        Widgets.Separator(_x + (int)width + 12, _y + 12, _width - (int)width - 12);
+        _y += 30;
+    }
+
+    void DrawActions(Item item)
+    {
+        Group("Actions");
+        string[] labels = ["Max Stack", "Duplicate", "Reset Stats"];
+        int width = (_width - 12) / labels.Length;
+        for (int i = 0; i < labels.Length; i++)
+        {
+            if (!Widgets.Button(new Rectangle(_x + i * (width + 6), _y + 2, width, 30), labels[i], false, 0.8f))
+                continue;
+
+            switch (i)
+            {
+                case 0: ItemFeatures.MaxStack(); break;
+                case 1: ItemFeatures.Duplicate(); break;
+                case 2: ResetStats(item); break;
+            }
+        }
+        _y += 38;
+    }
+
+    static void ResetStats(Item item)
+    {
+        int stack = item.stack, prefix = item.prefix;
+        bool favorited = item.favorited;
+        item.SetDefaults(item.type);
+        if (prefix > 0)
+            item.Prefix(prefix);
+        (item.stack, item.favorited) = (stack, favorited);
+    }
+
+    static IEnumerable<int> Prefixes(Item item)
+    {
+#if TMODLOADER
+        return Enumerable.Range(1, PrefixLoader.PrefixCount - 1).Where(item.CanApplyPrefix);
+#else
+        return item.GetRollablePrefixes() ?? [];
+#endif
+    }
+
+    static string PrefixName(int prefix)
+    {
+#if TMODLOADER
+        if (prefix >= PrefixID.Count)
+            return PrefixLoader.GetPrefix(prefix)?.DisplayName.Value ?? $"Prefix {prefix}";
+#endif
+        return Lang.prefix[prefix].Value;
+    }
+
+    void DrawPrefixes(Item item)
+    {
+        int[] prefixes = [.. Prefixes(item).OrderBy(PrefixName, StringComparer.OrdinalIgnoreCase)];
+        if (prefixes.Length == 0)
+            return;
+
+        Group("Prefix");
+        const int Columns = 3, Gap = 6;
+        int width = (_width - Gap * (Columns - 1)) / Columns;
+        int[] options = [0, .. prefixes];
+        for (int i = 0; i < options.Length; i++)
+        {
+            var bounds = new Rectangle(_x + i % Columns * (width + Gap), _y + i / Columns * 34, width, 30);
+            if (Widgets.Button(bounds, options[i] == 0 ? "None" : PrefixName(options[i]), item.prefix == options[i], 0.76f) && item.prefix != options[i])
+                ApplyPrefix(item, options[i]);
+        }
+        _y += (options.Length + Columns - 1) / Columns * 34 + 4;
+    }
+
+    static void ApplyPrefix(Item item, int prefix)
+    {
+        int stack = item.stack;
+        bool favorited = item.favorited;
+        item.SetDefaults(item.type);
+        item.Prefix(prefix);
+        (item.stack, item.favorited) = (stack, favorited);
+        Widgets.Sound(2, -1, -1, 37);
+    }
+
+    void DrawStats(Item item)
+    {
+        Group("Stats");
+        bool weapon = _reference.damage > 0;
+        if (weapon)
+        {
+            item.damage = IntRow("Damage", item.damage, 0, Math.Max(200, _reference.damage * 10), _reference.damage);
+            item.crit = IntRow("Critical chance", item.crit, 0, 100, _reference.crit, "{0}%");
+            item.knockBack = FloatRow("Knockback", item.knockBack, 0f, 20f, _reference.knockBack, "{0:0.0}");
+            item.scale = FloatRow("Size", item.scale, 0.25f, 5f, _reference.scale, "{0:0.00}x");
+        }
+
+        if (_reference.useStyle != 0)
+        {
+            item.useTime = IntRow("Use time", item.useTime, 1, Math.Max(60, _reference.useTime), _reference.useTime, "{0} ticks");
+            item.useAnimation = IntRow("Use animation", item.useAnimation, 1, Math.Max(60, _reference.useAnimation), _reference.useAnimation, "{0} ticks");
+        }
+
+        if (_reference.shoot > 0)
+            item.shootSpeed = FloatRow("Shot speed", item.shootSpeed, 0f, 40f, _reference.shootSpeed, "{0:0.0}");
+        if (_reference.defense > 0 || _reference.accessory || _reference.headSlot >= 0 || _reference.bodySlot >= 0 || _reference.legSlot >= 0)
+            item.defense = IntRow("Defense", item.defense, 0, Math.Max(100, _reference.defense * 10), _reference.defense);
+        if (item.maxStack > 1)
+            item.stack = IntRow("Stack", item.stack, 1, item.maxStack, item.maxStack);
+        if (_reference.useStyle != 0)
+            item.autoReuse = BoolRow("Auto reuse", item.autoReuse);
+    }
+
+    float FloatRow(string label, float value, float minimum, float maximum, float fallback, string format)
+    {
+        var row = new Rectangle(_x, _y, _width, RowHeight - 2);
+        string id = "itemEditor|" + label;
+        bool hot = Widgets.Hot(row) || Widgets.ActiveSlider == id;
+        if (hot)
+            Widgets.Tooltip = "Drag to change. Right-click to reset.";
+        Render.TextMid(Widgets.SpriteBatch, $"{label}: {string.Format(format, value)}", row, hot ? Widgets.Yellow : Widgets.Dim, 0.85f);
+        float result = Widgets.ValueBar(id, row, MathHelper.Clamp(value, minimum, maximum), minimum, maximum, fallback);
+        _y += RowHeight;
+        return Widgets.ActiveSlider == id || result != MathHelper.Clamp(value, minimum, maximum) ? result : value;
+    }
+
+    int IntRow(string label, int value, int minimum, int maximum, int fallback, string format = "{0}") => (int)Math.Round(FloatRow(label, value, minimum, maximum, fallback, format.Replace("{0}", "{0:0}")));
+
+    bool BoolRow(string label, bool value)
+    {
+        value = Widgets.ToggleRow(new Rectangle(_x, _y, _width, 28), label, value);
+        _y += RowHeight;
+        return value;
+    }
+}

src/TerraSharp/UI/MainWindow.Pages.cs

@@ -140,8 +140,11 @@ public sealed partial class MainWindow
         Toggle("Sonar", ref Settings.Sonar);
 
         Group("Actions");
-        if (Buttons(WindowManager.Items.Open ? "Close Item Browser" : "Item Browser") == 0)
+        switch (Buttons(WindowManager.Items.Open ? "Close Item Browser" : "Item Browser", WindowManager.Editor.Open ? "Close Item Editor" : "Item Editor"))
-            WindowManager.Toggle(WindowManager.Items);
+        {
+            case 0: WindowManager.Toggle(WindowManager.Items); break;
+            case 1: WindowManager.Toggle(WindowManager.Editor); break;
+        }
     }
 
     void VisualsPage()

src/TerraSharp/UI/MainWindow.Tooltips.cs

@@ -37,6 +37,7 @@ public sealed partial class MainWindow
         ["Infinite Items"] = "Keeps inventory stacks from shrinking.",
         ["Item Vacuum"] = "Pulls all dropped items to you.",
         ["Bank Buttons"] = "Piggy Bank, Safe, Defender's Forge and Void Vault buttons left of the inventory.",
+        ["Item Editor"] = "Change the prefix, stats and stack of the held or cursor item.",
         ["Auto Fishing"] = "Reels in on a bite while you hold a fishing pole.",
         ["Recast"] = "Casts again where you last cast by hand.",
         ["Catch enemies"] = "Reels in enemy catches too.",

src/TerraSharp/UI/Widgets.cs

@@ -227,6 +227,20 @@ public static class Widgets
         return true;
     }
 
+    public static bool ToggleRow(Rectangle row, string label, bool value)
+    {
+        bool hot = Hot(row);
+        if (hot && Click)
+        {
+            value = !value;
+            Sound(12);
+        }
+
+        Render.TextMid(SpriteBatch, label, row, hot ? Yellow : value ? On : Color.White, 0.85f);
+        ToggleIcon(new Rectangle(row.Right - 28, row.Y + 2, 24, 24), value, hot);
+        return value;
+    }
+
     public static void ToggleIcon(Rectangle bounds, bool on, bool hot)
     {
         Render.TextRight(SpriteBatch, on ? "On" : "Off", new Rectangle(bounds.X - 44, bounds.Y, 38, bounds.Height), on ? On : Dim * 0.75f, 0.78f);

src/TerraSharp/UI/WindowManager.cs

@@ -14,11 +14,12 @@ public static class WindowManager
     public static readonly ItemBrowser Items = new();
     public static readonly BuffBrowser Buffs = new();
     public static readonly NpcBrowser Npcs = new();
+    public static readonly ItemEditor Editor = new();
 
     const int TitleHeight = 40;
     const int MaxInputLength = 40;
 
-    static readonly List<Window> Stack = [Items, Buffs, Npcs, Menu];
+    static readonly List<Window> Stack = [Items, Buffs, Npcs, Editor, Menu];
     static Window? _dragging;
     static Vector2 _dragOffset;