GUIPerk.java

public class GUIPerk extends GuiScreen {
    private PerkList perkList; 
    private PerkControls perkControls;
    private int page;
    private PerkInfo selected;
    private final ArrayList<PerkInfo> info = new ArrayList<PerkInfo>();
    private List<PerkInfo> subList = new ArrayList<>();


    @Override
    public void drawScreen(int p_73863_1_, int p_73863_2_, float p_73863_3_) {
        //Clearing then filling the ArrayList (this is where information is pulled from)
        this.info.clear();
        for(Entry<String, PerkInfo> entry : Data.perkInfo.entrySet()){
            this.info.add(entry.getValue());
        }

        //Putting the current info into the sublist
        int start = this.page * 4 < this.info.size() ? this.page * 4 : this.info.size()-1;
        int end = this.page * 4 + 4 < this.info.size() ? this.page * 4 + 4 : this.info.size();

        if(this.info.size() > 0)
            this.subList = this.info.subList(start, end);

        this.drawDefaultBackground();

        for (int i = 0; i < 4; i++) {
            if(this.subList.size()-1 >= i){
                this.perkList.getNames()[i] = this.subList.get(i).getName();
                GuiButton button = (GuiButton) this.buttonList.get(i + 3);
                button.enabled = true;
            } else {
                GuiButton button = (GuiButton) this.buttonList.get(i + 3);
                button.enabled = false;
                this.perkList.getNames()[i] = "";
            }
        }



        if(this.selected != null) {
            this.perkControls.description = this.selected.getDescription();
        } else {
            this.perkControls.description = "";
        }

        this.perkControls.status = Data.statusMessage;

        this.perkList.draw();
        this.perkControls.draw();

        for(Object button : this.buttonList){
            GuiButton toDraw = (GuiButton) button;
            toDraw.drawButton(Minecraft.getMinecraft(), 0, 0);
        }
    }

    @Override
    protected void actionPerformed(GuiButton button) {
        switch(button.id){
        case 0: //Obtain
            if (this.selected != null) {
                Main.snw.sendToServer(new PerkRequest(this.selected.getSlug()));
                Main.snw.sendToServer(new Request(REQUEST.PERKS));
                GuiButton obtainButton = (GuiButton) this.buttonList.get(0);
                obtainButton.enabled = false;
            }
            break;
        case 1: //Next
            int x = Math.round(info.size() / 4);
            if (this.page < x){
                this.page++;
            }
            break;
        case 2: //Prev
            if(this.page > 0)
            {
                this.page--;
            }
            break;
        case 3: //List 1
            if(this.subList.size() > 0)
                this.selected = this.subList.get(0);
            break;
        case 4: //List 2
            if(this.subList.size() > 1)
                this.selected = this.subList.get(1);
            break;
        case 5: //List 3
            if(this.subList.size() > 2)
                this.selected = this.subList.get(2);
            break;
        case 6: //List 4
            if(this.subList.size() > 3)
                this.selected = this.subList.get(3);
            break;
        }

        if(button.id >= 3 && button.id <= 6){
            boolean active = true;
            if(this.selected.isObtained()){
                active = false;
            }
            GuiButton obtainButton = (GuiButton) this.buttonList.get(0);
            obtainButton.enabled = active;
        }
    }

    @Override
    public void initGui() {//176
        buttonList = new <GuiButton>ArrayList();

        //Clear park data on the client and request new info
        Data.perkInfo.clear();
        Data.statusMessage = "";
        Main.snw.sendToServer(new Request(REQUEST.PERKS));
        this.perkList = new PerkList(width/2 - 176, (this.height - 240)/2);
        //39,36
        //39,96
        //39,156
        //39,216
        this.perkControls = new PerkControls(this.width /2, (this.height - 240)/2);
        //id,x,y,width,height,string

        //Order of when these are added matters as I retrieve them by their index not id
        int commonX = width/2 + 7;
        int commonY = (height - 240) /2 + 215;
        buttonList.add(new GuiButton(0, commonX + 54, commonY, 54, 20, "Obtain"));
        buttonList.add(new GuiButton(1, commonX, commonY, 54, 20, "Next"));
        buttonList.add(new GuiButton(2, commonX + 108, commonY, 54, 20, "Prev"));

        for (int i = 0; i < 4; i++) {
            //this.buttonList.add(new GuiButton(0+3,,0,""));
            int y = (height - 240) /2 - 25 + (i+1) * 60;
            buttonList.add(new GuiButton(i + 3, width/2 - 176 + 38, y, 102, 20, "Select"));
        }
    }

    @Override
    public boolean doesGuiPauseGame() {
        return false;
    }

}