Inventory GUI editable?

[Xwaffle]

Okay, so I am working on a like Wizard/spell type mod. I have working spell items, but I want to have a mana system instead of breaking the items. Would it be easy/possible for me to add onto the Inventory Gui and just add like  x/100 Mana somewhere in the gui? Please give me some help on how I would do that.

[Draco18s]

Short answer: yes

Long answer: you need:

 

1) packet handler

2) GUI renderer

3) a way to save data on the player

4) an event handler

 

You can find all of that on my github.  Look at blocks.HealingCrystal and anything in .client

[Xwaffle]

Oh my, is it kind of like hard to do? I can probably do packet handler and GUI render but saving data on player would require NBT tags right?

[Xwaffle]

For the GUI should I use your GUIOVerheal? Or should I just use one of your RenderSoldier/RenderBomber and whatnot.