[1.12.2] Overriding Default Gui Elements

[-TheLittleGuy]

Hello, I have recently gotten into using forge for a mod I am working on and i would like to change the style of some of the game's default gui elements. These include things like the tab overlay and chat elements.

I would like to override the tab overlay specifically to display the numeric value of the player's Ping Like this example

so far i have gotten tab to display the numeric values, however  due to a reason im unsure of, the header and footer of the tab is not displayed (the areas above and below the player list - servers commonly have text displayed here)

Currently, i created a class that extended GuiPlayerTabOverlay (called GuiTabOverride), added the necessary modifications, and then called the render method inside of an event listener like so:

@SubscribeEvent
	public void overrideTab(RenderGameOverlayEvent.Pre event) {
		GuiTabOverride tab = new GuiTabOverride(mc, guiIngame);
		if(event.getType() == ElementType.PLAYER_LIST) {
			event.setCanceled(true); /** Here we disable the normal tab Element */
			Scoreboard scoreboard = this.mc.world.getScoreboard();
			 
			
			 ScaledResolution scaledresolution = new ScaledResolution(this.mc);
		        int i = scaledresolution.getScaledWidth();
		        
		            tab.renderPlayerlist(i, scoreboard, null);		            		       		
			
		}
					
		
	}

This does work, but once again, the header/footer of the tab doesn't get rendered, only the player list. Presumably it has something to do with the 3rd parameter in renderPlayerList being null since the real method is called inside GuiIngame and the 3rd parameter is the score objective. In order to fix this issue, would i have to create a class that overrides GuiIngame as well? Any help would be greatly appreciated!

[-TheLittleGuy]

The text above and below the player list that servers utilize for advertising purposes or stats http://prntscr.com/mpk7n0

(Note: it works here because this was a different version of my mod that didnt use forge)

Edited February 24, 2019 by -TheLittleGuy

[-TheLittleGuy]

so to clarify, i would have to manually set the header/footer data inside my new tab gui and use reflection to get the data from the default ones since there are only setters for the header/footer fields

 

[-TheLittleGuy]

do i extend Gui then? thats what i orginally had it set to but i was just experimenting. So in my new overlay i would access the header/footer data there correct?

[-TheLittleGuy]

Alright sounds good, thank you for your help. (sorry about my weird sentences, im pretty bad at explaining things)

[-TheLittleGuy]

Hey so after a few days of thinking, I am having trouble getting the value of the reflected fields.

When trying to render the tab, the game crashes and causes an IllegalArgumentException.

This is the method i used to get the value (same applies to footer) - the method is then called in renderTabOverlay in my new class

public void getHeader() {
	    	
	    	Field field;
			try {
				
				field = GuiPlayerTabOverlay.class.getDeclaredField("header");
				field.setAccessible(true);
	        this.header = (ITextComponent) field.get(this); //This is likely the problem
	        field.setAccessible(false);
			} catch (NoSuchFieldException | IllegalAccessException | SecurityException e) {
				
				e.printStackTrace();
			}
	        
	    }

Any assistance on what to fix would be appreciated - I haven't used reflection much so bear with me.

 

EDIT: I did some looking into how the header/footer text is set, which is set via packets, and the packet that handles this is called SPacketPlayerListHeaderFooter - which has getters for both of the values i need. Would it be possible to grab this packet data and use it?

Edited February 27, 2019 by -TheLittleGuy

[-TheLittleGuy]

the method ObfuscationReflectionHelper#findField wasnt present so i used ReflectionHelper#findField - maybe im using a different forge version?

Anyways i tried the following code 

static final Field head;
		static {
	    	head = ReflectionHelper.findField(GuiPlayerTabOverlay.class, "header" , "field_175256_i");
	    }
	    public void getHeader() throws IllegalArgumentException, IllegalAccessException  {
	    	tabOverlay = new GuiPlayerTabOverlay(mc, guiIngame);
	    	
	    	 this.setHeader((ITextComponent) head.get(tabOverlay));
	    	
	    }

then i called the getHeader method in the render method. No crashes, but the header still doesnt get rendered when its supposed to. Surely im missing something or calling the method in the wrong place perhaps?

[Cadiboo]

1 hour ago, -TheLittleGuy said:

method ObfuscationReflectionHelper#findField wasnt present so i used ReflectionHelper#findField - maybe im using a different forge version?

Reflection helper was depreciated in Forge #2780 or something and removed completely in 1.13.2

[-TheLittleGuy]

Alright, its fixed. I simply had to get the actual tab overlay instance, thank you for all your help!