GuiScreen

package com.packadge.gui;

import java.awt.*;
import java.awt.event.MouseEvent;
import java.util.HashMap;

public class GuiScreen {

    private static GuiScreen screen;
    private HashMap<String, GuiPanel> panels;
    private String currentPanel = "";

    private GuiScreen(){
        panels = new HashMap<String, GuiPanel>();
    }

    public static GuiScreen getInstance(){
        if (screen == null){
             screen = new GuiScreen();
        }
        return screen;
    }

    public void update(){
        if (panels.get(currentPanel) != null){
            panels.get(currentPanel).update();
        }
    }

    public void render(Graphics2D g){
        if (panels.get(currentPanel) != null){
            panels.get(currentPanel).render(g);
        }
    }

    public void add(String panelName, GuiPanel panel){
        panels.put(panelName, panel);
    }

    public void setCurrentPanel(String panelName){
        currentPanel = panelName;
    }

    public void mousePressed(MouseEvent e){
        if (panels.get(currentPanel) != null){
            panels.get(currentPanel).mousePressed(e);
        }
    }

    public void mouseReleased(MouseEvent e){
        if (panels.get(currentPanel) != null){
            panels.get(currentPanel).mouseReleased(e);
        }
    }

    public void mouseDragged(MouseEvent e){
        if (panels.get(currentPanel) != null){
            panels.get(currentPanel).mouseDragged(e);
        }
    }

    public void mouseMoved(MouseEvent e){
        if (panels.get(currentPanel) != null){
            panels.get(currentPanel).mouseMoved(e);
        }
    }
}