minecraft-kajetans-mod/src/main/java/me/km/networking/PlayerDisplayGui.java

package me.km.networking;

import java.util.ArrayList;
import java.util.TreeMap;
import me.km.KajetansMod;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.Gui;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

@SideOnly(Side.CLIENT)
public class PlayerDisplayGui extends Gui
{
    /*
        TODO
        Make player head rendering work, see
        net.minecraft.client.gui.GuiPlayerTabOverlay
    */
    private static final ResourceLocation CUSTOM_ICONS = new ResourceLocation(KajetansMod.MODID, "textures/gui/icons.png");
    
    public final static PlayerDisplayGui INSTANCE = new PlayerDisplayGui(Minecraft.getMinecraft());
    
    private class IconStorage
    {
        private final Icon icon;
        private final int count;
        
        public IconStorage(int id, int count)
        {
            this.icon = Icon.getIcon(id);
            this.count = count;
        }
        
        public int getWidth()
        {
            return count * icon.getWidth() - count + 1;
        }
        
        public int getHeight()
        {
            return icon.getHeight();
        }
    }
    
    private class LineData
    {
        private ArrayList<String> list;
        private ArrayList<IconStorage> icons;
        
        public LineData(String s)
        {
            this.list = new ArrayList<>();
            this.icons = new ArrayList<>();
            
            int pos;
            int old = 0;
            while(true)
            {
                // icon format #X-Y- where X and Y are numbers
                pos = s.indexOf("#", old);
                if(pos == -1)
                {
                    list.add(s.substring(old));
                    break;
                }
                list.add(s.substring(old, pos));
                try
                {
                    int first = s.indexOf("-", pos);
                    int second = s.indexOf("-", first + 1);
                    icons.add(new IconStorage(Integer.parseInt(s.substring(pos + 1, first)), Integer.parseInt(s.substring(first + 1, second))));
                    old = second + 1;
                }
                catch(Exception ex)
                {
                    list.add("FEHLER");
                    break;
                }
            }
        }
        
        public int getWidth()
        {
            return list.stream().mapToInt(s -> mc.fontRenderer.getStringWidth(s)).sum() + icons.stream().mapToInt(i -> i.getWidth()).sum();
        }
        
        public int getHeight()
        {
            return Math.max(mc.fontRenderer.FONT_HEIGHT, icons.stream().mapToInt(i -> i.getHeight()).max().orElse(0) + 1);
        }
    }
    
    private final TreeMap<Integer, LineData> strings;
    private final Minecraft mc;
    
    public PlayerDisplayGui(Minecraft mc)
    {
        this.mc = mc;
        this.strings = new TreeMap<>(); 
    }
    
    public void add(int i, String s)
    {
        strings.put(i, new LineData(s));
    }
    
    public void remove(int i)
    {
        strings.remove(i);
    }
    
    public void clear()
    {
        strings.clear();
    }
    
    public void paint()
    {
        if(strings.isEmpty())
        {
            return;
        }
        int x;
        int y = 2;
        
        int width = 0;
        int height = 4;
        
        for(LineData data : strings.values())
        {
            height += data.getHeight();
            width = Math.max(data.getWidth(), width);
        }
        
        drawRect(0, 0, width + 4, height, 1342177280);
        
        String s;
        for(LineData data : strings.values())
        {
            x = 2;
            for(int i = 0; i < data.list.size(); i ++)
            {
                s = data.list.get(i);
                mc.fontRenderer.drawString(s, x, y + 1, 0xFFFFFF);
                if(!s.isEmpty())
                {
                    x += mc.fontRenderer.getStringWidth(s);
                }
                else
                {
                    x--;
                }
                if(i < data.icons.size())
                {
                    x += paintIcons(data.icons.get(i), x, y);
                }
            }
            y += data.getHeight();
        }
    }
    
    private void bind(ResourceLocation res)
    {
        mc.getTextureManager().bindTexture(res);
    }
    
    private int paintIcons(IconStorage is, int x, int y)
    {
        bind(CUSTOM_ICONS);
        GlStateManager.enableBlend();
        Icon icon = is.icon;
        int width = icon.getWidth();
        int height = icon.getHeight();
        int offX = icon.getOffsetX();
        int offY = icon.getOffsetY();
        for(int i = 0; i < is.count; i++)
        {
            drawTexturedModalRect(x + width * i - i, y, offX, offY, width, height);
        }
        GlStateManager.disableBlend();
        return is.getWidth();
    }
}