How can i implement dark and light mode in a java swing gui application?-CodePudding

I am fairly new to coding and I am working on a desktop application where I want to implement a dark and light mode. The problem is that I want to switch back and forth between the two, in the main class I have an instantiation of a class that represents my main view of the app if I pass and if I add an action that switches to dark/light mode it only affects the popups because the function is called after the instantiation of the main view it has the same effect if I call the function before the instantiation. I tried all sorts of solutions but I can't figure it out. If anybody has an idea thanks in advance. Here is the code.

import view.MainFrame;

public class Main {
    public static void main(String[] args) {
        MainFrame mainFrame = MainFrame.getInstance();
    }
}

import controller.ActionManager;
import lombok.Getter;
import lombok.Setter;
import javax.swing.*;
import java.awt.*;

@Getter
@Setter
public class MainFrame extends JFrame {

    private static MainFrame instance = null;
    private MenuBar RuMenuBar;
    private ToolBar toolBar;
    private ActionManager actionManager;

    private MainFrame(){ }

    private void initialiseActionManager() {
        actionManager = new ActionManager();
    }


    private void initialiseGUI() {
        Toolkit tk = Toolkit.getDefaultToolkit();
        Dimension sc = tk.getScreenSize();
        int height = sc.height;
        int width = sc.width;
        setSize(width, height);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setTitle("Dokru");
        
        
        RuMenuBar = new MenuBar();
        setJMenuBar(RuMenuBar);
      
        toolBar = new ToolBar();

        add(toolBar,BorderLayout.NORTH);

        JPanel treePanel = new JPanel();

       // JScrollPane scrollPane = new JScrollPane(treePanel); todo scroll
        JPanel workspacePanel = new JPanel();
        JSplitPane splitPane = new 
        JSplitPane(JSplitPane.HORIZONTAL_SPLIT,treePanel,workspacePanel);
        splitPane.setOneTouchExpandable(true);
        splitPane.setDividerLocation(300);
        getContentPane().add(splitPane, BorderLayout.CENTER);

        setLocationRelativeTo(null);
        setVisible(true);
    }

    public static MainFrame getInstance() {
        if(instance == null) {
            instance = new MainFrame();
            instance.initialiseActionManager();
            instance.initialiseGUI();
        }
        return instance;
    }
}

CodePudding user response：

Happy to add more content in this section, this looks like a modern question for a very old framework like a swing.

However, there are opportunities to support this change in Java Swing, there are libraries like FlatLaf or material-ui-swing that give the possibility to implement different style in your app.

I'm the author of material-ui-swing so I will describe it, In particular, because It implements a concept of Material Theme (Since 2019) like the modern framework such as Flutter or Compose.

In fact, you can implement a custom theme as Jar and include it inside an external library, and an example can be DarkStackOverflowTheme.

To support the Dark mode and lite mode on your app, you can basically use the UI Manager to switch the Material theme in the MaterialUISwing(dark or lite theme).

Your question is a generic question but did some demo that include also the switch of the theme in the JMenuBar, you can take a look to DemoSwingRatio

CodePudding user response：

Use the system look and feel, you should get this automatically.

try {
    // Set System L&F
     UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (UnsupportedLookAndFeelException e) {
    // handle exception
}