How to make a simple inventory

Odin

Hi everybody ! Still newbie ! I really need to make an inventory. Just simple : 4 slots and can drag items (not to need stacks yet). That's all. Sorry about bad English ! May anyone HELP to make that, in order to imagine the ways to make a simple inventory. I saw in YouTube, that's is a nightmare.CONFUSING my Brain !Please...! Thank you so much !

Lethn

Odin

Ohhh, I've already seen this video.And I did the same.But, when i drag an item from positionA -> positionB CANNOT. I checked again..again...even I watched like " through DISPLAY" can not check out different from codes.And then I deleted all those codes. Then, Ask a Question Here! (T_T)!

Lethn

I think you should maybe go over it again and post up what you have so people can see what's going on and if you may have made a mistake. It happens to me when I'm learning even on basic stuff, sometimes it's just something silly because you're learning something new and you need a fresh pair of eyes on your work this is part of what programming and general game dev is.

Odin

I've posted these images so that anyone can HELP me.I really don't know where errors,when I do it same (Youtube).I do it to try them active? But it is not active as video clip.Please show me WHERE? "error item Nil" I can't really imagine the ways that make a simple inventory.Sorry about "copying" that code.But, I still don't understand some code line in these pictures.Please HELP! Thanks a lot !

Zelta

the ditor is telling you somethings wrong in the inventory line 17.

is the slot_gui_input function right connected? is the 'item' right defined?

Odin

Excuse me! I "copy" those code lines and types of Nodes the SAME in Youtube clip, but why theirs activate OK, and me ERROR? They still hide anyways? I would be very grateful to you if you pointed me out that error.

Odin

I mean : HOW TO FIX ???

GlyphTheWolf

Hi,

From what I see on images you attached slot2 and slot5 have no script connected.

Method defined in inventory is:

func slot_gui_input(event : InputEvent, slot : SlotClass)

It is expecting slot of type SlotClass, but I guess that if your slots (2 and 5) don't have script connected they are not of that type and because of that slot in above method is being null.

Odin

Huurrraaa !!! It works very well. I really appreciate your help.Thank you.In fact, initially because I made only one item, so when it was OK, I didn't realize it's OK . And I detached its(Slot) script so it gave a nil error, and then it messed me up. Oh,can I ask you some questions? 1) in Inventory script: line 10 I dont still understand syntax.Strange syntax. 2) is still line 10: signal "gui_input" - Why not see EMIT SIGNAL, but still use "OK"? I would be happy if you explain that ...

GlyphTheWolf

@Odin said: 1) in Inventory script: line 10 I dont still understand syntax.Strange syntax. That is syntax to connect signal. If you want to receive some signal you need to somehow "tell" specific object that you want to receive some signal it emits. Now what that code do is:
func _ready():
	#For each child of "inventory_slots" node
	for inv_slot in inventory_slots.get_children():
		#Connect signal emitted by current child "gui_input" with method "slot_gui_input" on itself
		inv_slot.connect("gui_input", self, "slot_gui_input", [inv_slot])

I would say that in more general case that "connect" syntax is:

#Everything in [""] is just some description of expected thing, not exactly code
["object emitting signal"].connect(["signal name"], ["receiver object"], ["receiver method to be called"], ["array of custom arguments that should be supplied to receiver method when called?"])

@Odin said: 2) is still line 10: signal "gui_input" - Why not see EMIT SIGNAL, but still use "OK"? I would be happy if you explain that ... "gui_input" signal is some built in Godot signal, so maybe you don't see emit(), but that is done internally by engine. You need explicit emit() call in case of custom signals, because since you define them, engine have no idea when they should be emitted. That "gui_input" signal is available because of node type used for "inventory". You can check available signals (built in, but also custom) if you select node and on the right side panel you change tab from "inspector" to "Node" - there should be list of available signals emitted by selected node.

Odin

OK Master ! Clear ! Thank you so much! Because I only edit some games, but all are DRAG and DROP. Now I begin to write code. So, sorry everybody for this convinence ! Again, thank you!

Odin

After a while of researching, I found making an inventory too difficult for me. So if I make an inventory using ListItem node which is supported by Godot is it ok? Are there any pros and cons? Can anyone help me with suggestions, I'm really bad at coding.Thank you, everybody!

cybereality

Try this tutorial. They also have to code in the description.

Odin

hix..hix....It's so hard to understand, so boring!

cybereality

Well inventory systems can be complicated. There's really not an easy shortcut.

Hanyuu

Odin

hahaha...Ok thank you Cyber