GuiScreen

package com.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 = new HashMap<>();
    private String currentPanel = "";

    private GuiScreen(){}

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

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

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

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

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

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

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

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

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