feature: light/dark mode theme support (#208)

* feature: light/dark mode theme support

New feature providing a more modern flat design with support for light and dark modes, including:
- New SheepIt logo (old one removed)
- New configuration option (-theme) that changes the existing client theme.
- Minimal UI cosmetic changes (some separation lines under the logo and above the buttons)

src/com/sheepit/client/Configuration.java

@@ -64,6 +64,7 @@ public class Configuration {
 	private boolean autoSignIn;
 	private String UIType;
 	private String hostname;
+	private String theme;
 	
 	public Configuration(File cache_dir_, String login_, String password_) {
 		this.configFilePath = null;
@@ -89,6 +90,7 @@ public class Configuration {
 		this.extras = "";
 		this.autoSignIn = false;
 		this.UIType = null;
+		this.theme = null;
 	}
 	
 	

src/com/sheepit/client/SettingsLoader.java

@@ -56,6 +56,7 @@ public class SettingsLoader {
 	private String cacheDir;
 	private String autoSignIn;
 	private String ui;
+	private String theme;
 	private int    priority;
 	
 	public SettingsLoader(String path_) {
@@ -67,7 +68,7 @@ public class SettingsLoader {
 		}
 	}
 	
-	public SettingsLoader(String path_, String login_, String password_, String proxy_, String hostname_, ComputeType computeMethod_, GPUDevice gpu_, int cores_, long maxRam_, int maxRenderTime_, String cacheDir_, boolean autoSignIn_, String ui_, int priority_) {
+	public SettingsLoader(String path_, String login_, String password_, String proxy_, String hostname_, ComputeType computeMethod_, GPUDevice gpu_, int cores_, long maxRam_, int maxRenderTime_, String cacheDir_, boolean autoSignIn_, String ui_, String theme_, int priority_) {
 		if (path_ == null) {
 			path = getDefaultFilePath();
 		}
@@ -82,6 +83,8 @@ public class SettingsLoader {
 		autoSignIn = String.valueOf(autoSignIn_);
 		ui = ui_;
 		priority = priority_;
+		theme = theme_;
+
 		if (cores_ > 0) {
 			cores = String.valueOf(cores_);
 		}
@@ -166,6 +169,10 @@ public class SettingsLoader {
 			if (ui != null) {
 				prop.setProperty("ui", ui);
 			}
+
+			if (theme != null) {
+				prop.setProperty("theme", theme);
+			}
 			
 			prop.store(output, null);
 		}
@@ -212,6 +219,7 @@ public class SettingsLoader {
 		this.priority = 19; // must be the same default as Configuration
 		this.ram = null;
 		this.renderTime = null;
+		this.theme = null;
 		
 		if (new File(path).exists() == false) {
 			return;
@@ -275,6 +283,10 @@ public class SettingsLoader {
 				this.ui = prop.getProperty("ui");
 			}
 			
+			if (prop.containsKey("theme")) {
+				this.theme = prop.getProperty("theme");
+			}
+
 			if (prop.containsKey("priority")) {
 				this.priority = Integer.parseInt(prop.getProperty("priority"));
 			}
@@ -357,12 +369,20 @@ public class SettingsLoader {
 		if (config.getUIType() == null && ui != null) {
 			config.setUIType(ui);
 		}
-		
+
+		if (config.getTheme() == null) {
+			if (this.theme != null) {
+				config.setTheme(this.theme);
+			} else {
+				config.setTheme("light");
+			}
+		}
+
 		config.setAutoSignIn(Boolean.valueOf(autoSignIn));
 	}
 	
 	@Override
 	public String toString() {
-		return "SettingsLoader [path=" + path + ", login=" + login + ", password=" + password + ", computeMethod=" + computeMethod + ", gpu=" + gpu + ", cacheDir=" + cacheDir + "priority="+priority+"]";
+		return "SettingsLoader [path=" + path + ", login=" + login + ", password=" + password + ", computeMethod=" + computeMethod + ", gpu=" + gpu + ", cacheDir=" + cacheDir + ", theme=" + theme + ", priority="+priority+"]";
 	}
 }

src/com/sheepit/client/standalone/GuiSwing.java

@@ -25,7 +25,6 @@ import java.awt.Image;
 import java.awt.MenuItem;
 import java.awt.PopupMenu;
 import java.awt.SystemTray;
-import java.awt.Toolkit;
 import java.awt.TrayIcon;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
@@ -57,6 +56,10 @@ import com.sheepit.client.standalone.swing.activity.Working;
 import lombok.Getter;
 import lombok.Setter;
 
+import com.formdev.flatlaf.FlatLightLaf;	// Required for dark & light mode
+import com.formdev.flatlaf.FlatDarkLaf;
+import com.formdev.flatlaf.FlatLaf;
+
 public class GuiSwing extends JFrame implements Gui {
 	public static final String type = "swing";
 
@@ -104,13 +107,6 @@ public class GuiSwing extends JFrame implements Gui {
 	
 	@Override
 	public void start() {
-		try {
-			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
-		}
-		catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException e1) {
-			e1.printStackTrace();
-		}
-		
 		if (useSysTray) {
 			try {
 				sysTray = SystemTray.getSystemTray();
@@ -158,6 +154,20 @@ public class GuiSwing extends JFrame implements Gui {
 		
 		this.showActivity(ActivityType.SETTINGS);
 		
+		try {
+			if (client.getConfiguration().getTheme().equals("light")) {
+				UIManager.setLookAndFeel(new FlatLightLaf());
+			} else if (client.getConfiguration().getTheme().equals("dark")) {
+				UIManager.setLookAndFeel(new FlatDarkLaf());
+			}
+
+			// Apply the selected theme to swing components
+			FlatLaf.updateUI();
+		}
+		catch (UnsupportedLookAndFeelException e1) {
+			e1.printStackTrace();
+		}
+
 		while (waitingForAuthentication) {
 			try {
 				synchronized (this) {

src/com/sheepit/client/standalone/Worker.java

@@ -112,6 +112,9 @@ public class Worker {
 	@Option(name = "-title", usage = "Custom title for the GUI Client", required = false)
 	private String title = "SheepIt Render Farm";
 	
+	@Option(name = "-theme", usage = "Specify the theme to use for the graphical client, default 'light', available 'light', 'dark'", required = false)
+	private String theme = null;
+
 	public static void main(String[] args) {
 		new Worker().doMain(args);
 	}
@@ -283,6 +286,16 @@ public class Worker {
 			config.setUIType(ui_type);
 		}
 		
+		if (theme != null) {
+			if (!theme.equals("light") && !theme.equals("dark")) {
+				System.err.println(String.format("The theme specified (%s) doesn't exist. Please choose 'light' or 'dark'.", theme));
+				System.err.println("Aborting");
+				System.exit(2);
+			}
+
+			config.setTheme(this.theme);
+		}
+
 		if (config_file != null) {
 			if (new File(config_file).exists() == false) {
 				System.err.println("Configuration file not found.");

src/com/sheepit/client/standalone/swing/activity/Settings.java

@@ -35,6 +35,7 @@ import java.util.List;
 import javax.swing.BorderFactory;
 import javax.swing.Box;
 import javax.swing.BoxLayout;
+import javax.swing.ButtonGroup;
 import javax.swing.ImageIcon;
 import javax.swing.JButton;
 import javax.swing.JCheckBox;
@@ -43,11 +44,18 @@ import javax.swing.JLabel;
 import javax.swing.JOptionPane;
 import javax.swing.JPanel;
 import javax.swing.JPasswordField;
+import javax.swing.JRadioButton;
 import javax.swing.JSlider;
 import javax.swing.JSpinner;
 import javax.swing.JTextField;
+import javax.swing.UIManager;
+import javax.swing.UnsupportedLookAndFeelException;
 import javax.swing.SpinnerNumberModel;
 
+import com.formdev.flatlaf.FlatLaf;
+import com.formdev.flatlaf.FlatLightLaf;
+import com.formdev.flatlaf.FlatDarkLaf;
+
 import com.sheepit.client.Configuration;
 import com.sheepit.client.Configuration.ComputeType;
 import com.sheepit.client.SettingsLoader;
@@ -78,6 +86,10 @@ public class Settings implements Activity {
 	private JTextField proxy;
 	private JTextField hostname;
 	
+	private ButtonGroup themeOptionsGroup;
+	private JRadioButton lightMode;
+	private JRadioButton darkMode;
+
 	private JCheckBox saveFile;
 	private JCheckBox autoSignIn;
 	JButton saveButton;
@@ -96,11 +108,13 @@ public class Settings implements Activity {
 		Configuration config = parent.getConfiguration();
 		new SettingsLoader(config.getConfigFilePath()).merge(config);
 		
+		applyTheme(config.getTheme());	// apply the proper theme (light/dark)
+
 		List<GPUDevice> gpus = GPU.listDevices(config);
 		
 		GridBagConstraints constraints = new GridBagConstraints();
 		int currentRow = 0;
-		ImageIcon image = new ImageIcon(getClass().getResource("/title.png"));
+		ImageIcon image = new ImageIcon(getClass().getResource("/sheepit-logo.png"));
 		constraints.fill = GridBagConstraints.CENTER;
 		
 		JLabel labelImage = new JLabel(image);
@@ -111,6 +125,11 @@ public class Settings implements Activity {
 		
 		++currentRow;
 		
+		constraints.gridy = currentRow;
+		parent.getContentPane().add(new JLabel(" "), constraints);	// Add a separator between logo and first panel
+
+		currentRow++;
+
 		// authentication
 		CollapsibleJPanel authentication_panel = new CollapsibleJPanel(new GridLayout(2, 2));
 		authentication_panel.setBorder(BorderFactory.createTitledBorder("Authentication"));
@@ -137,6 +156,36 @@ public class Settings implements Activity {
 		constraints.fill = GridBagConstraints.HORIZONTAL;
 		parent.getContentPane().add(authentication_panel, constraints);
 		
+		// Theme selection panel
+		CollapsibleJPanel themePanel = new CollapsibleJPanel(new GridLayout(1, 3));
+		themePanel.setBorder(BorderFactory.createTitledBorder("Theme"));
+
+		themeOptionsGroup = new ButtonGroup();
+
+		lightMode = new JRadioButton("Light");
+		lightMode.setActionCommand("light");
+		lightMode.setSelected(config.getTheme().equals("light"));
+		lightMode.addActionListener(new ApplyThemeAction());
+
+		darkMode = new JRadioButton("Dark");
+		darkMode.setActionCommand("dark");
+		darkMode.setSelected(config.getTheme().equals("dark"));
+		darkMode.addActionListener(new ApplyThemeAction());
+
+		themePanel.add(lightMode);
+		themePanel.add(darkMode);
+
+		// Group both radio buttons to allow only one selected
+		themeOptionsGroup.add(lightMode);
+		themeOptionsGroup.add(darkMode);
+
+		currentRow++;
+		constraints.gridx = 0;
+		constraints.gridy = currentRow;
+		constraints.gridwidth = 2;
+
+		parent.getContentPane().add(themePanel, constraints);
+
 		// directory
 		CollapsibleJPanel directory_panel = new CollapsibleJPanel(new GridLayout(1, 3));
 		directory_panel.setBorder(BorderFactory.createTitledBorder("Cache"));
@@ -370,6 +419,11 @@ public class Settings implements Activity {
 		constraints.gridwidth = 2;
 		parent.getContentPane().add(general_panel, constraints);
 		
+		currentRow++;
+		constraints.gridy = currentRow;
+		parent.getContentPane().add(new JLabel(" "), constraints);	// Add a separator between last checkboxes and button
+
+		currentRow++;
 		String buttonText = "Start";
 		if (parent.getClient() != null) {
 			if (parent.getClient().isRunning()) {
@@ -406,6 +460,22 @@ public class Settings implements Activity {
 		saveButton.setEnabled(selected);
 		return selected;
 	}
+
+	private void applyTheme(String theme_) {
+		try {
+			if (theme_.equals("light")) {
+				UIManager.setLookAndFeel(new FlatLightLaf());
+			} else if (theme_.equals("dark")) {
+				UIManager.setLookAndFeel(new FlatDarkLaf());
+			}
+
+			// Apply the new theme
+			FlatLaf.updateUI();
+		}
+		catch (UnsupportedLookAndFeelException e1) {
+			e1.printStackTrace();
+		}
+	}
 	
 	class ChooseFileAction implements ActionListener {
 		
@@ -452,6 +522,13 @@ public class Settings implements Activity {
 		}
 	}
 	
+	class ApplyThemeAction implements ActionListener {
+		@Override
+		public void actionPerformed(ActionEvent e) {
+			applyTheme(themeOptionsGroup.getSelection().getActionCommand());
+		}
+	}
+
 	class SaveAction implements ActionListener {
 		
 		@Override
@@ -464,6 +541,9 @@ public class Settings implements Activity {
 			if (config == null) {
 				return;
 			}
+
+			if (themeOptionsGroup.getSelection().getActionCommand() != null)
+				config.setTheme(themeOptionsGroup.getSelection().getActionCommand());
 			
 			if (cacheDir != null) {
 				File fromConfig = config.getStorageDir();
@@ -550,7 +630,22 @@ public class Settings implements Activity {
 			}
 			
 			if (saveFile.isSelected()) {
-				parent.setSettingsLoader(new SettingsLoader(config.getConfigFilePath(), login.getText(), new String(password.getPassword()), proxyText, hostnameText, method, selected_gpu, cpu_cores, max_ram, max_rendertime, cachePath, autoSignIn.isSelected(), GuiSwing.type, priority.getValue()));
+				parent.setSettingsLoader(new SettingsLoader(
+						config.getConfigFilePath(),
+						login.getText(),
+						new String(password.getPassword()),
+						proxyText,
+						hostnameText,
+						method,
+						selected_gpu,
+						cpu_cores,
+						max_ram,
+						max_rendertime,
+						cachePath,
+						autoSignIn.isSelected(),
+						GuiSwing.type,
+						themeOptionsGroup.getSelection().getActionCommand(),	// selected theme
+						priority.getValue()));
 				
 				// wait for successful authentication (to store the public key)
 				// or do we already have one?

src/com/sheepit/client/standalone/swing/activity/Working.java

@@ -40,6 +40,7 @@ import javax.swing.ImageIcon;
 import javax.swing.JButton;
 import javax.swing.JLabel;
 import javax.swing.JPanel;
+import javax.swing.UIManager;
 import javax.swing.Spring;
 import javax.swing.SpringLayout;
 
@@ -73,6 +74,7 @@ public class Working implements Activity {
 	private JLabel waiting_projects_value;
 	private JLabel connected_machines_value;
 	private JLabel user_info_total_rendertime_this_session_value;
+	private String currentTheme;
 	
 	public Working(GuiSwing parent_) {
 		parent = parent_;
@@ -92,10 +94,38 @@ public class Working implements Activity {
 		user_info_total_rendertime_this_session_value = new JLabel("");
 		lastRenderTime = new JLabel("");
 		lastRender = new JLabel("");
+		currentTheme = UIManager.getLookAndFeel().getName();    // Capture the theme on component instantiation
 	}
 	
 	@Override
 	public void show() {
+		// If the stored theme and the UIManager's theme doesn't match is bc the user has changed it
+		if (!currentTheme.equals(UIManager.getLookAndFeel().getName())) {
+			// And, as the user has changed the theme, then we must recreate all the UI elements with session data
+			// Reason being they are defined as class variables and therefore created once when the object
+			// is created the first time.
+			// As the Java swing engine applies the "look & feel" at creation time, we need to "re-create" the
+			// objects to ensure they have the right theme colors.
+			statusContent = new JLabel(statusContent.getText());
+			renderedFrameContent = new JLabel(renderedFrameContent.getText());
+			remainingFrameContent = new JLabel(remainingFrameContent.getText());
+			creditEarned = new JLabel(creditEarned.getText());
+			current_project_name_value = new JLabel(current_project_name_value.getText());
+			current_project_duration_value = new JLabel(current_project_duration_value.getText());
+			currrent_project_progression_value = new JLabel(currrent_project_progression_value.getText());
+			current_project_compute_method_value = new JLabel(current_project_compute_method_value.getText());
+			user_info_points_total_value = new JLabel(user_info_points_total_value.getText());
+			renderable_projects_value = new JLabel(renderable_projects_value.getText());
+			waiting_projects_value = new JLabel(waiting_projects_value.getText());
+			connected_machines_value = new JLabel(connected_machines_value.getText());
+			user_info_total_rendertime_this_session_value = new JLabel(user_info_total_rendertime_this_session_value.getText());
+			lastRenderTime = new JLabel(lastRenderTime.getText());
+			lastRender = new JLabel(lastRender.getText());
+
+			// set the new theme as the current one
+			currentTheme = UIManager.getLookAndFeel().getName();
+		}
+
 		// current project
 		JPanel current_project_panel = new JPanel(new SpringLayout());
 		current_project_panel.setBorder(BorderFactory.createTitledBorder("Project"));
@@ -173,7 +203,7 @@ public class Working implements Activity {
 		last_frame_panel.add(lastRenderTime);
 		last_frame_panel.add(lastRender);
 		
-		ImageIcon image = new ImageIcon(getClass().getResource("/title.png"));
+		ImageIcon image = new ImageIcon(getClass().getResource("/sheepit-logo.png"));
 		JLabel labelImage = new JLabel(image);
 		labelImage.setAlignmentX(Component.CENTER_ALIGNMENT);
 		parent.getContentPane().add(labelImage);
@@ -208,10 +238,12 @@ public class Working implements Activity {
 		global_constraints.weightx = 1;
 		global_constraints.gridx = 0;
 		
+		parent.getContentPane().add(new JLabel(" "), global_constraints);		// Add a separator between logo and first panel
 		parent.getContentPane().add(current_project_panel, global_constraints);
 		parent.getContentPane().add(global_stats_panel, global_constraints);
 		parent.getContentPane().add(session_info_panel, global_constraints);
 		parent.getContentPane().add(last_frame_panel, global_constraints);
+		parent.getContentPane().add(new JLabel(" "), global_constraints);		// Add a separator between last panel and buttons
 		parent.getContentPane().add(buttonsPanel, global_constraints);
 		
 		Spring widthLeftColumn = getBestWidth(current_project_panel, 4, 2);