I was wondering how I could get an item's icon to display in a GUI. (Or a fake slot would work too, but I don't know how to do that either.)

Warning: This is only for 1.7.10.  I haven't figured out what the equivalent for 1.8 is yet.

 

You may want to draw the texture of an Item in a custom GuiScreen.  Items don't directly have a ResourceLocation for their texture. Instead, they have an IIcon object which holds the UV-coordinates of the texture on a giant image which holds all the Item textures.  The ResourceLocation is located at TextureMap.locationItemsTexture. If you want to use this in a GUI, you have to get the IIcon of the Item first, bind the TextureMap.locationItemsTexture, and then call the drawTexturedModelRectFromIcon() method to draw the IIcon of the item.

Warning: This is only for 1.7.10.  I haven't figured out what the equivalent for 1.8 is yet.

 

You may want to draw the texture of an Item in a custom GuiScreen.  Items don't directly have a ResourceLocation for their texture. Instead, they have an IIcon object which holds the UV-coordinates of the texture on a giant image which holds all the Item textures.  The ResourceLocation is located at TextureMap.locationItemsTexture. If you want to use this in a GUI, you have to get the IIcon of the Item first, bind the TextureMap.locationItemsTexture, and then call the drawTexturedModelRectFromIcon() method to draw the IIcon of the item.

 

So, something like this?

protected void guiDrawIcon(Item item, int x, int y) {
Minecraft.getMinecraft().getTextureManager().bindTexture(TextureMap.locationBlocksTexture);
IIcon icon = item.getIconFromDamage(0);
GL11.glEnable(GL11.GL_BLEND);
this.drawTexturedModelRectFromIcon(x, y, icon, 16, 16);
GL11.glDisable(GL11.GL_BLEND);
}

I think so, yeah. Did it work?

If this doesn't work you can make an fake slot. Just simply create your own slotclass (extending Slot) and set the "isItemValid()" and "canTakeStack()" to false.(not sure if these are the exact methodes, but you'll have to add the right one anyway if you extend the Slot class)