Bind the item container to the item container display.

将物品容器和物品容器显示器绑定。

scripts/inventory/HotBar.cs

@@ -10,13 +10,15 @@ namespace ColdMint.scripts.inventory;
 public partial class HotBar : HBoxContainer
 {
     private IItemContainer? _itemContainer;
-
+    private IItemContainerDisplay? _itemContainerDisplay;
     
     public override void _Ready()
     {
         base._Ready();
         _itemContainer = new UniversalItemContainer(Config.HotBarSize);
         _itemContainer.SupportSelect = true;
+        _itemContainerDisplay = new ItemSlotContainerDisplay(this);
+        _itemContainerDisplay.BindItemContainer(_itemContainer);
         NodeUtils.DeleteAllChild(this);
     }
 

scripts/inventory/IItemContainerDisplay.cs

@@ -0,0 +1,13 @@
+using System.Collections.Generic;
+
+namespace ColdMint.scripts.inventory;
+
+public interface IItemContainerDisplay : IEnumerable<IItemDisplay>
+{
+    /// <summary>
+    /// <para>Bind an item container to the item container display</para>
+    /// <para>为物品容器显示器绑定物品容器</para>
+    /// </summary>
+    /// <param name="itemContainer"></param>
+    void BindItemContainer(IItemContainer itemContainer);
+}

scripts/inventory/IItemDisplay.cs

@@ -0,0 +1,34 @@
+namespace ColdMint.scripts.inventory;
+
+/// <summary>
+/// <para>IItemDisplay</para>
+/// <para>物品显示器</para>
+/// </summary>
+public interface IItemDisplay
+{
+    
+    /// <summary>
+    /// <para>Call this method to refresh the display when the item's information changes</para>
+    /// <para>物品的信息发生变更时，调用此方法刷新显示器</para>
+    /// </summary>
+    /// <remarks>
+    ///<param name="item">
+    ///<para>New data for items after changes</para>
+    ///<para>发生改变后的物品新数据</para>
+    /// </param>
+    /// </remarks>
+    void Update(IItem? item);
+
+    /// <summary>
+    /// <para>Show item Display</para>
+    /// <para>显示物品显示器</para>
+    /// </summary>
+    void ShowSelf();
+    
+    /// <summary>
+    /// <para>Hide item Display</para>
+    /// <para>隐藏物品显示器</para>
+    /// </summary>
+    void HideSelf();
+
+}

scripts/inventory/ItemContainerDisplayTemplate.cs

@@ -0,0 +1,127 @@
+using System.Collections;
+using System.Collections.Generic;
+using ColdMint.scripts.map.events;
+
+namespace ColdMint.scripts.inventory;
+
+public abstract class ItemContainerDisplayTemplate : IItemContainerDisplay
+{
+    protected readonly List<IItemDisplay> ItemDisplayList = [];
+    private IItemContainer? _itemContainer;
+
+    public void BindItemContainer(IItemContainer itemContainer)
+    {
+        if (_itemContainer == itemContainer)
+        {
+            return;
+        }
+
+        if (_itemContainer != null)
+        {
+            _itemContainer.SelectedItemChangeEvent -= OnSelectedItemChangeEvent;
+        }
+
+        _itemContainer = itemContainer;
+        _itemContainer.SelectedItemChangeEvent += OnSelectedItemChangeEvent;
+        var totalCapacity = itemContainer.GetTotalCapacity();
+        var currentCapacity = ItemDisplayList.Count;
+        var capacityDifference = totalCapacity - currentCapacity;
+        var adjustedEndIndex = totalCapacity;
+        if (capacityDifference > 0)
+        {
+            //There are those that need to be added, and we create them.
+            //有需要添加的，我们创建他们。
+            for (var i = 0; i < capacityDifference; i++)
+            {
+                AddItemDisplay();
+            }
+        }
+        else if (capacityDifference < 0)
+        {
+            //There are things that need to be hidden
+            //有需要被隐藏的
+            adjustedEndIndex += capacityDifference;
+            var loopEndIndex = currentCapacity + capacityDifference;
+            for (var i = currentCapacity - 1; i >= loopEndIndex; i--)
+            {
+                var itemDisplay = ItemDisplayList[i];
+                itemDisplay.Update(null);
+                itemDisplay.HideSelf();
+            }
+        }
+
+        UpdateData(itemContainer, adjustedEndIndex);
+    }
+
+    private void OnSelectedItemChangeEvent(SelectedItemChangeEvent selectedItemChangeEvent)
+    {
+        if (_itemContainer == null)
+        {
+            return;
+        }
+
+        var usedCapacity = _itemContainer.GetUsedCapacity();
+        UpdateDataForSingleLocation(_itemContainer, selectedItemChangeEvent.OldIndex, usedCapacity);
+        UpdateDataForSingleLocation(_itemContainer, selectedItemChangeEvent.NewIndex, usedCapacity);
+    }
+
+    /// <summary>
+    /// <para>Update data</para>
+    /// <para>更新数据</para>
+    /// </summary>
+    /// <remarks>
+    ///<para>Used to batch update the Item data in itemContainer to the display.</para>
+    ///<para>用于将itemContainer内的Item数据批量更新到显示器内。</para>
+    /// </remarks>
+    /// <param name="itemContainer">
+    ///<para>Item container data</para>
+    ///<para>物品容器数据</para>
+    /// </param>
+    /// <param name="endIndex">
+    ///<para>endIndex</para>
+    ///<para>结束位置</para>
+    /// </param>
+    /// <param name="startIndex">
+    ///<para>startIndex</para>
+    ///<para>起始位置</para>
+    /// </param>
+    private void UpdateData(IItemContainer itemContainer, int endIndex, int startIndex = 0)
+    {
+        var usedCapacity = itemContainer.GetUsedCapacity();
+        for (var i = startIndex; i < endIndex; i++)
+        {
+            var itemDisplay = ItemDisplayList[i];
+            itemDisplay.Update(i < usedCapacity ? itemContainer.GetItem(i) : null);
+            itemDisplay.ShowSelf();
+        }
+    }
+
+    /// <summary>
+    /// <para>Update data for a single location</para>
+    /// <para>更新单个位置的数据</para>
+    /// </summary>
+    /// <param name="itemContainer"></param>
+    /// <param name="index"></param>
+    /// <param name="usedCapacity"></param>
+    private void UpdateDataForSingleLocation(IItemContainer itemContainer, int index, int usedCapacity)
+    {
+        var itemDisplay = ItemDisplayList[index];
+        itemDisplay.Update(index < usedCapacity ? itemContainer.GetItem(index) : null);
+    }
+
+    /// <summary>
+    /// <para>Add item display</para>
+    /// <para>添加物品显示器</para>
+    /// </summary>
+    protected abstract void AddItemDisplay();
+
+    public IEnumerator<IItemDisplay> GetEnumerator()
+    {
+        return ItemDisplayList.GetEnumerator();
+    }
+
+    IEnumerator IEnumerable.GetEnumerator()
+    {
+        return GetEnumerator();
+    }
+}

scripts/inventory/ItemSlotContainerDisplay.cs

@@ -0,0 +1,26 @@
+using ColdMint.scripts.utils;
+using Godot;
+
+namespace ColdMint.scripts.inventory;
+
+public class ItemSlotContainerDisplay(Node rootNode) : ItemContainerDisplayTemplate
+{
+    private readonly PackedScene? _packedScene = GD.Load<PackedScene>("res://prefab/ui/ItemSlot.tscn");
+
+    protected override void AddItemDisplay()
+    {
+        if (_packedScene == null)
+        {
+            return;
+        }
+
+        var itemSlotNode = NodeUtils.InstantiatePackedScene<ItemSlotNode>(_packedScene);
+        if (itemSlotNode == null)
+        {
+            return;
+        }
+
+        ItemDisplayList.Add(itemSlotNode);
+        NodeUtils.CallDeferredAddChild(rootNode, itemSlotNode);
+    }
+}

scripts/inventory/ItemSlotNode.cs

@@ -10,7 +10,7 @@ namespace ColdMint.scripts.inventory;
 /// <para>A slot in the inventory</para>
 /// <para>物品栏内的一个插槽</para>
 /// </summary>
-public partial class ItemSlotNode : MarginContainer
+public partial class ItemSlotNode : MarginContainer, IItemDisplay
 {
     private TextureRect? _backgroundTextureRect;
     private TextureRect? _iconTextureRect;
@@ -21,17 +21,6 @@ public partial class ItemSlotNode : MarginContainer
     private Texture2D? _backgroundTextureWhenSelect;
     private IItem? _item;
 
-    public IItem? Item
-    {
-        set
-        {
-            //Set item
-            //设置物品
-            _item = value;
-            UpdateAllDisplay();
-        }
-    }
-
     public override void _Ready()
     {
         _backgroundTexture = GD.Load<Texture2D>("res://sprites/ui/ItemBarEmpty.png");
@@ -49,8 +38,6 @@ public partial class ItemSlotNode : MarginContainer
     {
         if (_isSelect || _iconTextureRect == null)
         {
-            //Drag is not allowed if there is no icon or no pile of items.
-            //如果没有图标或者没有物品堆，那么不允许拖动。
             return new Variant();
         }
 
@@ -143,34 +130,6 @@ public partial class ItemSlotNode : MarginContainer
 
 
 
-    /// <summary>
-    /// <para>Clean out the items in the item slot</para>
-    /// <para>清理物品槽内的物品</para>
-    /// </summary>
-    /// <param name="queueFree">
-    ///<para>Whether to release a node</para>
-    ///<para>是否释放节点</para>
-    /// </param>
-    /// <remarks>
-    ///<para>Clean up item object references in item slots.</para>
-    ///<para>清理物品槽内的物品对象引用。</para>
-    /// </remarks>
-    public void ClearItem(bool queueFree = true)
-    {
-        if (_item == null)
-        {
-            return;
-        }
-
-        if (queueFree && _item is Node node)
-        {
-            node.QueueFree();
-        }
-
-        _item = null;
-        UpdateAllDisplay();
-    }
-
     public override void _DropData(Vector2 atPosition, Variant data)
     {
         if (_iconTextureRect == null)
@@ -202,7 +161,7 @@ public partial class ItemSlotNode : MarginContainer
             if (packsack.ItemContainer != null && _item != null)
             {
                 packsack.ItemContainer.AddItem(_item);
-                ClearItem(false);
+                // ClearItem(false);
                 return;
             }
         }
@@ -215,12 +174,12 @@ public partial class ItemSlotNode : MarginContainer
             }
 
             customPacksack.ItemContainer.AddItem(sourceItem);
-            itemSlotNode.ClearItem(false);
+            // itemSlotNode.ClearItem(false);
             return;
         }
 
-        AddItem(sourceItem);
-        itemSlotNode.ClearItem(false);
+        // AddItem(sourceItem);
+        // itemSlotNode.ClearItem(false);
     }
 
     /// <summary>
@@ -251,24 +210,6 @@ public partial class ItemSlotNode : MarginContainer
 
     public TextureRect? BackgroundTextureRect => _backgroundTextureRect;
 
-    /// <summary>
-    /// <para>Whether the item in this node is empty</para>
-    /// <para>此节点内的物品是否为空的</para>
-    /// </summary>
-    /// <returns>
-    ///<para>Return true if the number of items is 0 or the item object does not exist</para>
-    ///<para>当物品数量为0或物品对象不存在时，返回true</para>
-    /// </returns>
-    public bool IsEmpty()
-    {
-        if (_item == null || _item.Quantity == 0)
-        {
-            return true;
-        }
-
-        return false;
-    }
-
 
     /// <summary>
     /// <para>Update all displays of this slot</para>
@@ -386,53 +327,19 @@ public partial class ItemSlotNode : MarginContainer
         return true;
     }
 
-    /// <summary>
-    /// <para>Remove items from the item slot</para>
-    /// <para>从物品槽内移除物品</para>
-    /// </summary>
-    /// <param name="number">
-    ///<para>number(Less than 0, remove all items)</para>
-    ///<para>物品数量(小于0，则移除全部物品)</para>
-    /// </param>
-    /// <returns>
-    ///<para>How many items were actually removed</para>
-    ///<para>实际移除了多少个物品</para>
-    /// </returns>
-    public int RemoveItem(int number)
+
+    public void Update(IItem? item)
     {
-        if (_item == null)
-        {
-            return 0;
-        }
-
-        //The number of actual removals
-        //实际移除的数量
-        var removeNumber = number < 0 ? _item.Quantity : number;
-        _item.Quantity -= removeNumber;
-        if (_item.Quantity <= 0)
-        {
-            ClearItem();
-        }
-
-        return removeNumber;
+        UpdateAllDisplay();
     }
 
-    public bool AddItem(IItem item)
+    public void ShowSelf()
     {
-        if (_item == null)
-        {
-            Item = item;
-            return true;
-        }
+        Show();
+    }
 
-        var newQuantity = item.Quantity + _item.Quantity;
-        _item.Quantity = Math.Min(newQuantity, _item.MaxQuantity);
-        if (item is Node2D node2D)
-        {
-            node2D.QueueFree();
-        }
-
-        UpdateQuantityLabel();
-        return true;
+    public void HideSelf()
+    {
+        Hide();
     }
 }

scripts/inventory/UniversalItemContainer.cs

@@ -280,10 +280,12 @@ public class UniversalItemContainer(int totalCapacity) : IItemContainer
 
         var oldItem = _itemList[oldIndex];
         oldItem.IsSelect = false;
-        var newItem= _itemList[newIndex];
+        var newItem = _itemList[newIndex];
         newItem.IsSelect = true;
         SelectedItemChangeEvent?.Invoke(new SelectedItemChangeEvent
         {
+            NewIndex = newIndex,
+            OldIndex = oldIndex,
             NewItem = newItem,
             OldItem = oldItem
         });

scripts/map/events/SelectedItemChangeEvent.cs

@@ -8,6 +8,10 @@ namespace ColdMint.scripts.map.events;
 /// </summary>
 public class SelectedItemChangeEvent
 {
+    public int NewIndex { get; set; }
+    
+    public int OldIndex { get; set; }
+    
     /// <summary>
     /// <para>Newly selected item</para>
     /// <para>新选中的物品</para>
@@ -18,7 +22,5 @@ public class SelectedItemChangeEvent
     /// <para>Lost the selected item</para>
     /// <para>失去选中的物品</para>
     /// </summary>
-    // ReSharper disable UnusedAutoPropertyAccessor.Global
     public IItem? OldItem { get; set; }
-    // ReSharper restore UnusedAutoPropertyAccessor.Global
 }