I need to get the stack out of the player's inventory container which is currently being hovered with the mouse. Basically, I have this code set up which checks for a keybinding and invokes onKeyPressed() when the button is pressed. (The KeyBindingWrapper is a utility class I wrote for myself, it's not available in Forge)

 

 

new KeyBindingWrapper("key.forcefieldmod.inventory.assign", Keyboard.KEY_Z, "key.forcefieldmod.category") {

@Override
public void onKeyPressed() {
	GuiScreen currentGuiScreen = ForgeUtils.getMinecraft().currentScreen;

	if (currentGuiScreen instanceof GuiInventory) {
		GuiInventory inv = (GuiInventory) currentGuiScreen;
		// get ze stack
	}
}

};

 

 

What's the best way to accomplish this? I've looked through the inventory's GUI and container class, but I haven't found fields or methods which could be of any use yet.

In GuiContainer there is a method called: isMouseOverSlot which takes a slot and a 2d vector of your mouse position(x and y).

But unfortunately that method is private.

 

You could write your own method though.

private Container _container;
private ItemStack _itemStack;
private Minecraft _mcClient;

private int _height;
private int _width;

//constructor:
public YOURCLASS(){
	_container = null;
	_itemStack = null;
	_mcClient = FMLClientHandler.instance.getClient();
	/* Somehow initialize _height and _width from the player's active guiscreen.
		_height = ?
		_width = ?
	*/
}

public ItemStack getItemStack(){
	if(this._mcClient != null) {
		_container = this._mcClient.thePlayer.openContainer;
        int mouseX = Mouse.getEventX() * this.width / this.mc.displayWidth;
        int mouseY = this.height - Mouse.getEventY() * this.height / this.mc.displayHeight - 1;
        for (int i = 0; i < _container.inventorySlots.inventorySlots.size(); ++i){
            Slot slot = (Slot)_container.inventorySlots.inventorySlots.get(i);

            if (this.isMouseOverSlot(slot, mouseX, mouseY, _width, _height) && slot.func_111238_b()){
                return this._itemStack = slot.getItemStack();
            }
        }
	}
}

public boolean isMouseOverSlot(Slot slot, int xCoord, int yCoord, int guiLeft, int guiTop){
    int left = guiLeft;
    int top = guiTop;
    xCoord -= top;
    yCoord -= left;
    return xCoord >= slot.xDisplayPosition - 1 && xCoord < slot.xDisplayPosition + 16 + 1 && yCoord >= slot.yDisplayPosition - 1 && yCoord < slot.yDisplayPosition + 16 + 1;
}

You can use EntityPlayer.inventory.GetItemStack() and SetItemStack(stack) to access the picked up item.