Item Slots

Item Slots

TesseraUI provides three widgets for displaying and interacting with Minecraft items.

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<item-slot> (HTML)

<!-- Display only -->
<item-slot size="24" item="minecraft:diamond"/>

<!-- With item count -->
<item-slot size="24" item="minecraft:gold_ingot" show-count="true"/>

<!-- Clickable (wires onclick handler) -->
<item-slot size="24" item="minecraft:netherite_sword" onclick="onSlotClick"/>

Attribute	Default	Description
size	18	Width and height in pixels
item	—	namespace:id of the item to display
show-count	true	Show the stack count overlay
onclick	—	Java handler name

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TesseraItemSlot (Java)

Display only

TesseraItemSlot slot = new TesseraItemSlot(x, y, 32);
slot.item(new ItemStack(Items.DIAMOND));

With inventory picker

Clicking opens a floating overlay of the player's inventory. The player can pick an item by clicking it.

TesseraItemSlot slot = new TesseraItemSlot(x, y, 32);
slot.item(new ItemStack(Items.AIR))
    .inventoryPicker(true)
    .onItemPicked(stack -> {
        this.selectedItem = stack;
        myConfig.save();
    });

When inventoryPicker(true) is set without onItemPicked, the picked item simply replaces the slot's current display item.

Options

slot.showCount(false);             // hide stack count
slot.size(24);                     // resize
slot.onClick(this::handleClick);   // custom click handler

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TesseraItemGrid

A rectangular grid of draggable item slots backed by a flat ItemStack[].

// 4 columns × 2 rows, each slot 22 px
TesseraItemGrid grid = new TesseraItemGrid(x, y, 4, 2, 22);

grid.setItem(0, new ItemStack(Items.DIAMOND));
grid.setItem(1, new ItemStack(Items.GOLD_INGOT, 3));
// Index formula: row * cols + col

panel.add(grid);

Items can be dragged between slots in the grid without any extra wiring.

Listening to changes

grid.onChange((index, stack) -> {
    inventory[index] = stack;
    saveInventory();
});

Reading items

ItemStack stack = grid.getItem(index);
ItemStack[] all = grid.getItems();

---

TesseraInventoryPicker

A floating overlay showing the player's full inventory (main 3×9 grid + hotbar 1×9). Opened automatically by TesseraItemSlot.inventoryPicker(true), or manually:

// Open near a widget; the picker clamps to screen bounds automatically
TesseraInventoryPicker.open(anchorX, anchorY, stack -> {
    mySlot.item(stack);
});

Clicking outside the picker panel closes it without picking anything.

The overlay is rendered by TesseraScreen.renderTesseraOverlays() — no manual wiring needed when extending TesseraScreen.