Unreal Engine 5.7 Tutorial #11 Advanced Equipment & Inventory Logic (March 2026)

Описание: Unreal Engine RPG Tutorial: Advanced Equipment & Inventory Logic
In this video, we continue building our professional-grade RPG Inventory System! Today, we are focusing on the "Handshake" between your Bag and your Equipment Slots. We aren't just moving icons; we are managing data integrity across multiple arrays to ensure items aren't lost, duplicated, or causing memory leaks.

🧠 Why are we doing this?
A common mistake in beginner tutorials is "teleporting" items without checking their state. In this session, we implement Data-First Inventory Logic:

Memory Management: If you don't "Clear Children" when refreshing a UI grid, Unreal keeps those hidden widgets in memory. Over a long play session, this creates massive lag. We fix that today.

State Validation: We ensure the game checks if a slot is empty before trying to unequip it, preventing "Null Reference" errors that crash games.

Combat Balance: We handle the logic for 2-Handed vs. 1-Handed weapons so players can't exploit the system by holding a Greatsword and a Shield simultaneously.

📘 What’s Inside the Blueprint:
1. The "Remove Item" Function (The Bag Logic)
We create a robust function in the Player Blueprint to handle item subtraction.

The Logic: It checks the item stack. If it’s the last item (Stack less than = to 1), we remove the index entirely. If it's a stack (like potions or arrows), we decrement the integer by 1 and update the array element. This keeps your inventory clean and accurate.

2. The "Refresh Inventory" Event (UI Optimization)
We build a custom event in the Inventory Widget to rebuild the grid.

The Logic: Before drawing new icons, we Clear Children on the Grid Panel and reset the Row/Column variables to their default values (1,1). This ensures your UI is always a "fresh" representation of your data.

3. The "Remove Attached Item" Function (The Swap Logic)
This is the "Unequip" button logic.

The Logic: When a player clicks an equipped item, the function checks the class validity, runs the Pick Up Item function to send the data back to the bag array, and then clears the equipment slot index.

4. 2-Handed Weapon Constraints (The Rule Maker)
We implement a Pure Function called Is 2H Equipped.

The Logic: If a player equips a 2-Handed weapon, the code automatically searches the "Off-Hand" slot (Index 1). If a shield or dagger is there, it triggers a forced unequip. This maintains the "Risk vs. Reward" of heavy weaponry.

5. Scaling for Full Armor Sets
We expand our Item Type Enumeration to include:

Head, Chest, Gloves, Hands, Legs, and Feet.

By the end of this video, your code will be ready to handle a full set of legendary armor, not just weapons!



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