Merge pull request #120 from informatik-ag-ngl/f/enhanced_component_list

Revised the rendering and selection mechanism in ComponentList

src/main/java/envoy/client/data/Chat.java

@@ -4,7 +4,7 @@ import java.io.IOException;
 import java.io.Serializable;
 
 import envoy.client.net.WriteProxy;
-import envoy.client.ui.list.ComponentListModel;
+import envoy.client.ui.list.Model;
 import envoy.data.Message;
 import envoy.data.Message.MessageStatus;
 import envoy.data.User;
@@ -28,7 +28,7 @@ public class Chat implements Serializable {
 	private static final long serialVersionUID = -7751248474547242056L;
 
 	private final User							recipient;
-	private final ComponentListModel<Message>	model	= new ComponentListModel<>();
+	private final Model<Message>	model	= new Model<>();
 
 	/**
 	 * Provides the list of messages that the recipient receives.<br>
@@ -80,7 +80,7 @@ public class Chat implements Serializable {
 	 * @return all messages in the current chat
 	 * @since Envoy v0.1-alpha
 	 */
-	public ComponentListModel<Message> getModel() { return model; }
+	public Model<Message> getModel() { return model; }
 
 	/**
 	 * @return the recipient of a message

src/main/java/envoy/client/data/Settings.java

@@ -112,13 +112,19 @@ public class Settings {
 	 * @param theme the {@link Theme} to add
 	 * @since Envoy v0.2-alpha
 	 */
-	public void addNewThemeToMap(Theme theme) { settings.getThemes().put(theme.getThemeName(), theme); }
+	public void addNewThemeToMap(Theme theme) { getThemes().put(theme.getThemeName(), theme); }
 
 	/**
 	 * @return the name of the currently active {@link Theme}
 	 * @since Envoy v0.2-alpha
 	 */
-	public String getCurrentTheme() { return (String) items.get("currentTheme").get(); }
+	public String getCurrentThemeName() { return (String) items.get("currentTheme").get(); }
+
+	/**
+	 * @return the currently active {@link Theme}
+	 * @since Envoy v0.1-beta
+	 */
+	public Theme getCurrentTheme() { return getTheme(getCurrentThemeName()); }
 
 	/**
 	 * Sets the name of the current {@link Theme}.

src/main/java/envoy/client/ui/ContactSearchComponent.java

@@ -1,4 +1,4 @@
-package envoy.client.ui.renderer;
+package envoy.client.ui;
 
 import java.awt.Component;
 import java.awt.Dimension;
@@ -8,45 +8,36 @@ import javax.swing.*;
 
 import envoy.client.data.Settings;
 import envoy.client.event.SendEvent;
-import envoy.client.ui.Color;
 import envoy.client.ui.list.ComponentList;
-import envoy.client.ui.list.ComponentListCellRenderer;
 import envoy.client.ui.primary.PrimaryButton;
 import envoy.data.User;
 import envoy.event.ContactOperationEvent;
 import envoy.event.EventBus;
 
 /**
- * Defines how a contact is displayed.<br>
+ * Project: <strong>envoy-client</strong>
- * <br>
+ * File: <strong>ContactSearchComponent.java</strong>
- * Project: <strong>envoy-client</strong><br>
+ * Created: <strong>21.03.2020</strong>
- * File: <strong>ContactsSearchRenderer.java</strong><br>
- * Created: <strong>08.02.2020</strong><br>
  *
- * @author Maximilian K&auml;fer
  * @author Kai S. K. Engelbart
- * @since Envoy v0.3-alpha
+ * @since Envoy v0.1-beta
  */
-public class ContactsSearchRenderer implements ComponentListCellRenderer<User> {
+public class ContactSearchComponent extends JComponent {
 
-	@Override
+	private static final long serialVersionUID = 3166795412575239455L;
-	public JComponent getListCellComponent(ComponentList<? extends User> list, User user, boolean isSelected) {
+
-		final JPanel panel = new JPanel();
+	public ContactSearchComponent(ComponentList<? extends User> list, User user) {
-		panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));
+		setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
-		if (isSelected) {
+
-			panel.setBackground(Color.DARK_GRAY);
+		setBackground(list.getBackground());
-			panel.setForeground(Color.RED);
+		setForeground(list.getForeground());
-		} else {
-			panel.setBackground(list.getBackground());
-			panel.setForeground(list.getForeground());
-		}
 
 		JLabel display = new JLabel(user.getName());
-		display.setForeground(Settings.getInstance().getThemes().get(Settings.getInstance().getCurrentTheme()).getMessageTextColor());
+		display.setForeground(Settings.getInstance().getCurrentTheme().getMessageTextColor());
 		display.setAlignmentX(Component.LEFT_ALIGNMENT);
 		display.setAlignmentY(Component.CENTER_ALIGNMENT);
 		display.setFont(new Font("Arial", Font.PLAIN, 16));
-		panel.add(display);
+		add(display);
 
 		PrimaryButton add = new PrimaryButton("+");
 		add.setFont(new Font("Arial", Font.PLAIN, 19));
@@ -63,17 +54,15 @@ public class ContactsSearchRenderer implements ComponentListCellRenderer<User> {
 			EventBus.getInstance().dispatch(new SendEvent(contactsOperationEvent));
 		});
 
-		panel.add(add);
+		add(add);
 
 		// Define some space to the messages below
-		panel.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createEmptyBorder(0, 0, 15, 0), BorderFactory.createEtchedBorder()));
+		setBorder(BorderFactory.createCompoundBorder(BorderFactory.createEmptyBorder(0, 0, 15, 0), BorderFactory.createEtchedBorder()));
 
 		// Define a maximum height of 50px
 		Dimension size = new Dimension(435, 50);
-		panel.setMaximumSize(size);
+		setMaximumSize(size);
-		panel.setMinimumSize(size);
+		setMinimumSize(size);
-		panel.setPreferredSize(size);
+		setPreferredSize(size);
-
-		return panel;
 	}
 }

src/main/java/envoy/client/ui/ContextMenu.java

@@ -50,7 +50,6 @@ public class ContextMenu extends JPopupMenu {
 
 	private ButtonGroup	radioButtonGroup	= new ButtonGroup();
 	private boolean		built				= false;
-	private boolean		visible				= false;
 
 	/**
 	 * @param parent the component which will call this
@@ -110,8 +109,10 @@ public class ContextMenu extends JPopupMenu {
 			if (mnemonics.containsKey(text)) item.setMnemonic(mnemonics.get(text));
 			add(item);
 		});
-		getInvoker().addMouseListener(getShowingListener());
+		if (getInvoker() != null) {
-		built = true;
+			getInvoker().addMouseListener(getShowingListener());
+			built = true;
+		}
 		return this;
 	}
 
@@ -138,10 +139,8 @@ public class ContextMenu extends JPopupMenu {
 				if (!built) build();
 				if (e.isPopupTrigger()) {
 					// hides the menu if already visible
-					visible = !visible;
+					if (!isVisible()) show(e.getComponent(), e.getX(), e.getY());
-					if (visible) show(e.getComponent(), e.getX(), e.getY());
 					else setVisible(false);
-
 				}
 			}
 		};

src/main/java/envoy/client/ui/MessageComponent.java

@@ -1,4 +1,4 @@
-package envoy.client.ui.renderer;
+package envoy.client.ui;
 
 import java.awt.*;
 import java.io.IOException;
@@ -8,60 +8,41 @@ import java.util.EnumMap;
 import javax.swing.*;
 
 import envoy.client.data.Settings;
-import envoy.client.ui.Color;
-import envoy.client.ui.IconUtil;
 import envoy.client.ui.list.ComponentList;
-import envoy.client.ui.list.ComponentListCellRenderer;
 import envoy.data.Message;
 import envoy.data.Message.MessageStatus;
 
 /**
- * Defines how a message is displayed.<br>
+ * Project: <strong>envoy-client</strong>
- * <br>
+ * File: <strong>MessageComponent.java</strong>
- * Project: <strong>envoy-client</strong><br>
+ * Created: <strong>21.03.2020</strong>
- * File: <strong>MessageListRenderer.java</strong><br>
- * Created: <strong>19 Oct 2019</strong><br>
  *
  * @author Kai S. K. Engelbart
- * @author Maximilian K&auml;fer
+ * @since Envoy v0.1-beta
- * @author Leon Hofmeister
- * @since Envoy v0.1-alpha
  */
-public class MessageListRenderer implements ComponentListCellRenderer<Message> {
+public class MessageComponent extends JPanel {
+
+	private static final long serialVersionUID = 103920706139926996L;
 
 	private static EnumMap<MessageStatus, ImageIcon>	statusIcons;
 	private static ImageIcon							forwardIcon;
 
 	static {
 		try {
-			statusIcons = IconUtil.loadByEnum(MessageStatus.class, 16);
+			statusIcons	= IconUtil.loadByEnum(MessageStatus.class, 16);
 			forwardIcon	= IconUtil.load("/icons/forward.png", 16);
 		} catch (IOException e) {
 			e.printStackTrace();
 		}
 	}
 
-	private final long senderId;
+	public MessageComponent(ComponentList<? extends Message> list, Message message, long senderId) {
+		this(list.getMaximumSize().width, message, senderId);
+	}
 
-	/**
+	public MessageComponent(int width, Message message, long senderId) {
-	 * Initializes a message list renderer. Messages with the given sender ID will
+		final var	theme	= Settings.getInstance().getCurrentTheme();
-	 * be aligned on the right side, while all other messages will be aligned on
+		final int	padding	= (int) (width * 0.35);
-	 * the left side
-	 * 
-	 * @param senderId the sender ID of the messages to align on the right side
-	 * @since Envoy v0.1-beta
-	 */
-	public MessageListRenderer(long senderId) { this.senderId = senderId; }
-
-	// TODO: Handle message attachments
-
-	@Override
-	public JPanel getListCellComponent(ComponentList<? extends Message> list, Message message, boolean isSelected) {
-		final var theme = Settings.getInstance().getThemes().get(Settings.getInstance().getCurrentTheme());
-
-		// Panel
-		final var	panel	= new JPanel();
-		final int	padding	= (int) (list.getWidth() * 0.35);
 
 		GridBagLayout gbl_panel = new GridBagLayout();
 		gbl_panel.columnWidths	= new int[] { 1, 1 };
@@ -69,8 +50,8 @@ public class MessageListRenderer implements ComponentListCellRenderer<Message> {
 		gbl_panel.columnWeights	= new double[] { 1, 1 };
 		gbl_panel.rowWeights	= new double[] { 1, 1 };
 
-		panel.setLayout(gbl_panel);
+		setLayout(gbl_panel);
-		panel.setBackground(isSelected ? theme.getSelectionColor() : theme.getCellColor());
+		setBackground(theme.getCellColor());
 
 		// Date Label - The Label that displays the creation date of a message
 		var dateLabel = new JLabel(new SimpleDateFormat("dd.MM.yyyy HH:mm").format(message.getCreationDate()));
@@ -83,7 +64,7 @@ public class MessageListRenderer implements ComponentListCellRenderer<Message> {
 		gbc_dateLabel.fill	= GridBagConstraints.BOTH;
 		gbc_dateLabel.gridx	= 0;
 		gbc_dateLabel.gridy	= 0;
-		panel.add(dateLabel, gbc_dateLabel);
+		add(dateLabel, gbc_dateLabel);
 
 		// Message area - The JTextArea that displays the text content of a message.
 		var messageTextArea = new JTextArea(message.getText());
@@ -95,13 +76,13 @@ public class MessageListRenderer implements ComponentListCellRenderer<Message> {
 		messageTextArea.setEditable(false);
 		var font = new Font("Arial", Font.PLAIN, 14);
 		messageTextArea.setFont(font);
-		messageTextArea.setSize(list.getMaximumSize().width - padding - 16, 10);
+		messageTextArea.setSize(width - padding - 16, 10);
 
 		var gbc_messageTextArea = new GridBagConstraints();
 		gbc_messageTextArea.fill	= GridBagConstraints.HORIZONTAL;
 		gbc_messageTextArea.gridx	= 0;
 		gbc_messageTextArea.gridy	= 1;
-		panel.add(messageTextArea, gbc_messageTextArea);
+		add(messageTextArea, gbc_messageTextArea);
 
 		// Status Label - displays the status of the message
 		var statusLabel = new JLabel(statusIcons.get(message.getStatus()));
@@ -109,32 +90,31 @@ public class MessageListRenderer implements ComponentListCellRenderer<Message> {
 		var gbc_statusLabel = new GridBagConstraints();
 		gbc_statusLabel.gridx	= 1;
 		gbc_statusLabel.gridy	= 1;
-		panel.add(statusLabel, gbc_statusLabel);
+		add(statusLabel, gbc_statusLabel);
 
 		// Forwarding
 		if (message.isForwarded()) {
 			var forwardLabel = new JLabel("Forwarded", forwardIcon, SwingConstants.CENTER);
-			forwardLabel.setBackground(panel.getBackground());
+			forwardLabel.setBackground(getBackground());
 			forwardLabel.setForeground(Color.lightGray);
 
 			var gbc_forwardLabel = new GridBagConstraints();
 			gbc_forwardLabel.fill	= GridBagConstraints.BOTH;
 			gbc_forwardLabel.gridx	= 1;
 			gbc_forwardLabel.gridy	= 0;
-			panel.add(forwardLabel, gbc_forwardLabel);
+			add(forwardLabel, gbc_forwardLabel);
 		}
 
 		// Define an etched border and some space to the messages below
 		var ours = senderId == message.getSenderId();
-		panel.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createEmptyBorder(0, ours ? padding : 0, 10, ours ? 0 : padding),
+		setBorder(BorderFactory.createCompoundBorder(
+				BorderFactory.createEmptyBorder(0, ours ? padding : 10, 10, ours ? 0 : padding),
 				BorderFactory.createEtchedBorder()));
 
-		var size = new Dimension(list.getMaximumSize().width - 50, panel.getPreferredSize().height);
+		var size = new Dimension(width - 50, getPreferredSize().height);
 
-		panel.setPreferredSize(size);
+		setPreferredSize(size);
-		panel.setMinimumSize(size);
+		setMinimumSize(size);
-		panel.setMaximumSize(size);
+		setMaximumSize(size);
-
-		return panel;
 	}
 }

src/main/java/envoy/client/ui/UserComponent.java

@@ -0,0 +1,62 @@
+package envoy.client.ui;
+
+import java.awt.BorderLayout;
+import java.awt.Dimension;
+
+import javax.swing.JComponent;
+import javax.swing.JLabel;
+
+import envoy.client.data.Settings;
+import envoy.client.ui.list.ComponentList;
+import envoy.data.User;
+import envoy.data.User.UserStatus;
+
+/**
+ * Project: <strong>envoy-client</strong>
+ * File: <strong>UserComponent.java</strong>
+ * Created: <strong>21.03.2020</strong>
+ *
+ * @author Kai S. K. Engelbart
+ * @since Envoy v0.1-beta
+ */
+public class UserComponent extends JComponent {
+
+	private static final long serialVersionUID = 8450602172939729585L;
+
+	public UserComponent(ComponentList<? extends User> list, User user) {
+		final Theme theme = Settings.getInstance().getCurrentTheme();
+
+		setLayout(new BorderLayout());
+
+		// Panel background
+		setBackground(theme.getCellColor());
+		setOpaque(true);
+		setPreferredSize(new Dimension(100, 35));
+
+		// TODO add profile picture support in BorderLayout.West
+
+		JLabel username = new JLabel(user.getName());
+		username.setForeground(theme.getUserNameColor());
+		add(username, BorderLayout.CENTER);
+
+		final UserStatus	status		= user.getStatus();
+		JLabel				statusLabel	= new JLabel(status.toString());
+		Color				foreground;
+		switch (status) {
+			case AWAY:
+				foreground = Color.yellow;
+				break;
+			case BUSY:
+				foreground = Color.blue;
+				break;
+			case ONLINE:
+				foreground = Color.green;
+				break;
+			default:
+				foreground = Color.lightGray;
+				break;
+		}
+		statusLabel.setForeground(foreground);
+		add(statusLabel, BorderLayout.NORTH);
+	}
+}

src/main/java/envoy/client/ui/container/ChatWindow.java

@@ -22,16 +22,13 @@ import envoy.client.event.MessageCreationEvent;
 import envoy.client.event.ThemeChangeEvent;
 import envoy.client.net.Client;
 import envoy.client.net.WriteProxy;
-import envoy.client.ui.ContextMenu;
+import envoy.client.ui.*;
-import envoy.client.ui.Theme;
 import envoy.client.ui.list.ComponentList;
 import envoy.client.ui.list.ComponentList.SelectionMode;
-import envoy.client.ui.list.ComponentListModel;
+import envoy.client.ui.list.Model;
 import envoy.client.ui.primary.PrimaryButton;
 import envoy.client.ui.primary.PrimaryScrollPane;
 import envoy.client.ui.primary.PrimaryTextArea;
-import envoy.client.ui.renderer.ContactsSearchRenderer;
-import envoy.client.ui.renderer.MessageListRenderer;
 import envoy.client.ui.renderer.UserListRenderer;
 import envoy.client.ui.settings.SettingsScreen;
 import envoy.data.Message;
@@ -54,8 +51,7 @@ import envoy.util.EnvoyLog;
 public class ChatWindow extends JFrame {
 
 	/**
-	 * This int defines the maximum amount of chars allowed per message. Currently
+	 * This integer defines the maximum amount of chars allowed per message.
-	 * set at 200.
 	 *
 	 * @since Envoy 0.1-beta
 	 */
@@ -77,7 +73,6 @@ public class ChatWindow extends JFrame {
 	private JTextPane				textPane				= new JTextPane();
 	private PrimaryButton			postButton				= new PrimaryButton("Post");
 	private PrimaryButton			settingsButton			= new PrimaryButton("Settings");
-	@SuppressWarnings("unused")
 	private JPopupMenu				contextMenu;
 
 	// Contacts Header
@@ -86,13 +81,12 @@ public class ChatWindow extends JFrame {
 	private PrimaryButton	addContact		= new PrimaryButton("+");
 
 	// Search Contacts
-	private final JPanel					searchPane					= new JPanel();
+	private final JPanel				searchPane					= new JPanel();
-	private final PrimaryButton				cancelButton				= new PrimaryButton("x");
+	private final PrimaryButton			cancelButton				= new PrimaryButton("x");
-	private final PrimaryTextArea			searchField					= new PrimaryTextArea(space);
+	private final PrimaryTextArea		searchField					= new PrimaryTextArea(space);
-	private final PrimaryScrollPane			scrollForPossibleContacts	= new PrimaryScrollPane();
+	private final PrimaryScrollPane		scrollForPossibleContacts	= new PrimaryScrollPane();
-	private final ContactsSearchRenderer	contactRenderer				= new ContactsSearchRenderer();
+	private final Model<User>			contactsModel				= new Model<>();
-	private final ComponentListModel<User>	contactsModel				= new ComponentListModel<>();
+	private final ComponentList<User>	contactList					= new ComponentList<User>().setRenderer(ContactSearchComponent::new);
-	private final ComponentList<User>		contactList					= new ComponentList<>(contactRenderer);
 
 	private static final Logger logger = EnvoyLog.getLogger(ChatWindow.class);
 
@@ -125,16 +119,14 @@ public class ChatWindow extends JFrame {
 		gbl_contentPane.rowWeights		= new double[] { 0.03, 0.001, 1.0, 0.005 };
 		contentPane.setLayout(gbl_contentPane);
 
-		messageList.setBorder(new EmptyBorder(space, space, space, space));
+		// ContextMenu
-		messageList.setSelectionMode(SelectionMode.SINGLE);
 		Map<String, ActionListener> commands = new HashMap<>() {
 
 			private static final long serialVersionUID = -2755235774946990126L;
 
 			{
 				put("forward selected message",
-						evt -> forwardMessageToMultipleUsers(messageList
+						evt -> forwardMessageToMultipleUsers(messageList.getSingleSelectedElement(),
-							.getSingleSelectedElement(),
 								ContactsChooserDialog
 									.showForwardingDialog("Forward selected message to", messageList.getSingleSelectedElement(), client)));
 				put("copy", evt -> {
@@ -151,6 +143,14 @@ public class ChatWindow extends JFrame {
 		};
 		contextMenu = new ContextMenu(null, messageList, commands, null, null).build();
 
+		messageList.setBorder(new EmptyBorder(space, space, space, space));
+		messageList.setSelectionMode(SelectionMode.SINGLE);
+		messageList.setSelectionHandler((message, comp, isSelected) -> {
+			final var theme = Settings.getInstance().getCurrentTheme();
+			comp.setBackground(isSelected ? theme.getSelectionColor() : theme.getCellColor());
+			contextMenu.show(comp, 0, 0);
+		});
+
 		scrollPane.setViewportView(messageList);
 		scrollPane.addComponentListener(new ComponentAdapter() {
 
@@ -396,11 +396,11 @@ public class ChatWindow extends JFrame {
 		gbc_addContact.gridy	= 0;
 		gbc_addContact.insets	= insets;
 
-		addContact.addActionListener((evt) -> { drawContactSearch(gbc_searchPane); });
+		addContact.addActionListener(evt -> drawContactSearch(gbc_searchPane));
 
 		contactsHeader.add(addContact, gbc_addContact);
 
-		applyTheme(Settings.getInstance().getThemes().get(Settings.getInstance().getCurrentTheme()));
+		applyTheme(Settings.getInstance().getCurrentTheme());
 
 		contentPane.add(contactsHeader, gbc_contactsHeader);
 		contentPane.revalidate();
@@ -645,7 +645,7 @@ public class ChatWindow extends JFrame {
 		this.localDb	= localDb;
 		this.writeProxy	= writeProxy;
 
-		messageList.setRenderer(new MessageListRenderer(client.getSender().getId()));
+		messageList.setRenderer((list, message) -> new MessageComponent(list, message, client.getSender().getId()));
 
 		// Load users and chats
 		new Thread(() -> {

src/main/java/envoy/client/ui/container/ContactsChooserDialog.java

@@ -14,11 +14,10 @@ import javax.swing.border.EmptyBorder;
 import envoy.client.data.Settings;
 import envoy.client.net.Client;
 import envoy.client.ui.Theme;
+import envoy.client.ui.UserComponent;
 import envoy.client.ui.list.ComponentList;
 import envoy.client.ui.list.ComponentList.SelectionMode;
-import envoy.client.ui.list.ComponentListModel;
+import envoy.client.ui.list.Model;
-import envoy.client.ui.renderer.MessageListRenderer;
-import envoy.client.ui.renderer.UserComponentListRenderer;
 import envoy.data.Message;
 import envoy.data.User;
 
@@ -36,11 +35,11 @@ public class ContactsChooserDialog extends JDialog {
 
 	private static final long serialVersionUID = -5774558118579032256L;
 
-	private ComponentList<User>	contactList		= new ComponentList<>(new UserComponentListRenderer());
+	private ComponentList<User>	contactList		= new ComponentList<User>().setRenderer(UserComponent::new);
 	private JButton				okButton		= new JButton("Ok");
 	private JButton				cancelButton	= new JButton("Cancel");
 
-	private final Theme theme = Settings.getInstance().getTheme(Settings.getInstance().getCurrentTheme());
+	private final Theme theme = Settings.getInstance().getCurrentTheme();
 
 	private final JPanel contentPanel = new JPanel();
 
@@ -67,16 +66,18 @@ public class ContactsChooserDialog extends JDialog {
 		dialog.setTitle(title);
 		dialog.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
 		dialog.addCancelButtonActionListener(e -> dialog.dispose());
-		dialog.getContentPanel()
+		// dialog.getContentPanel()
-			.add(new MessageListRenderer(client.getSender().getId()).getListCellComponent(null, message, false), BorderLayout.NORTH);
+		// .add(new
+		// MessageListRenderer(client.getSender().getId()).getListCellComponent(null,
+		// message, false), BorderLayout.NORTH);
 		List<User> results = new ArrayList<>();
 		dialog.addOkButtonActionListener(e -> { results.addAll(dialog.getContactList().getSelectedElements()); dialog.dispose(); });
-		ComponentListModel<User> contactListModel = dialog.getContactList().getModel();
+		Model<User> contactListModel = dialog.getContactList().getModel();
 		client.getContacts().getContacts().forEach(user -> contactListModel.add(user));
 		dialog.setVisible(true);
 		dialog.repaint();
 		dialog.revalidate();
-		return results.size() > 0 ? results : null;
+		return results;
 	}
 
 	/**
@@ -84,7 +85,8 @@ public class ContactsChooserDialog extends JDialog {
 	 */
 	private ContactsChooserDialog() {
 		contactList.setSelectionMode(SelectionMode.MULTIPLE);
-		// setBounds(100, 100, 450, 300);
+		contactList
+			.setSelectionHandler((user, comp, isSelected) -> comp.setBackground(isSelected ? theme.getSelectionColor() : theme.getCellColor()));
 		setModal(true);
 		getContentPane().setLayout(new BorderLayout());
 		setBackground(theme.getBackgroundColor());
@@ -121,6 +123,4 @@ public class ContactsChooserDialog extends JDialog {
 	private void addOkButtonActionListener(ActionListener l) { okButton.addActionListener(l); }
 
 	private void addCancelButtonActionListener(ActionListener l) { cancelButton.addActionListener(l); }
-
-	private JPanel getContentPanel() { return contentPanel; }
 }

src/main/java/envoy/client/ui/container/LoginDialog.java

@@ -291,7 +291,7 @@ public class LoginDialog extends JDialog {
 	}
 
 	private void setTheme() {
-		Theme theme = Settings.getInstance().getThemes().get(Settings.getInstance().getCurrentTheme());
+		Theme theme = Settings.getInstance().getCurrentTheme();
 
 		// Panels
 		contentPanel.setBackground(theme.getBackgroundColor());

src/main/java/envoy/client/ui/list/ComponentList.java

@@ -10,7 +10,7 @@ import javax.swing.*;
 
 /**
  * Provides a vertical list layout of components provided in a
- * {@link ComponentListModel}. Similar to {@link javax.swing.JList} but capable
+ * {@link Model}. Similar to {@link javax.swing.JList} but capable
  * of rendering {@link JPanel}s.<br>
  * <br>
  * Project: <strong>envoy-client</strong><br>
@@ -23,10 +23,11 @@ import javax.swing.*;
  */
 public class ComponentList<E> extends JPanel {
 
-	private ComponentListModel<E>			model;
+	private Model<E>			model;
-	private ComponentListCellRenderer<E>	renderer;
+	private Renderer<E>			renderer;
-	private SelectionMode					selectionMode	= SelectionMode.NONE;
+	private SelectionHandler<E>	selectionHandler;
-	private Set<Integer>					selection		= new HashSet<>();
+	private SelectionMode		selectionMode	= SelectionMode.NONE;
+	private Set<Integer>		selection		= new HashSet<>();
 
 	private static final long serialVersionUID = 1759644503942876737L;
 
@@ -53,64 +54,20 @@ public class ComponentList<E> extends JPanel {
 	}
 
 	/**
-	 * Initializes a default {@link ComponentList} without a model or a renderer.
+	 * Creates an instance of {@link ComponentList}.
 	 *
-	 * @since Envoy v0.1-beta
+	 * @since Envoy v0.3-alpha
 	 */
 	public ComponentList() { setLayout(new BoxLayout(this, BoxLayout.Y_AXIS)); }
 
-	/**
-	 * Creates an instance of {@link ComponentList}.
-	 *
-	 * @param renderer the list cell renderer used to display elements provided by
-	 *                 the {@link ComponentListModel}
-	 * @since Envoy v0.3-alpha
-	 */
-	public ComponentList(ComponentListCellRenderer<E> renderer) {
-		this();
-		setRenderer(renderer);
-	}
-
-	/**
-	 * Creates an instance of {@link ComponentList}.
-	 *
-	 * @param model    the list model providing the list elements to render
-	 * @param renderer the list cell renderer used to display elements provided by
-	 *                 the {@link ComponentListModel}
-	 * @since Envoy v0.3-alpha
-	 */
-	public ComponentList(ComponentListModel<E> model, ComponentListCellRenderer<E> renderer) {
-		this(renderer);
-		setModel(model);
-	}
-
-	/**
-	 * Sets the list model providing the list elements to render. The rendered
-	 * components will be synchronized with the contents of the new model or removed
-	 * if the new model is {@code null}.
-	 *
-	 * @param model the list model to set
-	 * @since Envoy v0.3-alpha
-	 */
-	public void setModel(ComponentListModel<E> model) {
-
-		// Remove old model
-		if (this.model != null) this.model.setComponentList(null);
-
-		// Synchronize with new model
-		this.model = model;
-		if (model != null) model.setComponentList(this);
-		synchronizeModel();
-	}
-
 	/**
 	 * Removes all child components and then adds all components representing the
-	 * elements of the {@link ComponentListModel}.
+	 * elements of the {@link Model}.
 	 *
 	 * @since Envoy v0.3-alpha
 	 */
 	public void synchronizeModel() {
-		if (model != null && renderer != null) {
+		if (model != null) {
 			removeAll();
 			model.forEach(this::addElement);
 			revalidate();
@@ -125,10 +82,12 @@ public class ComponentList<E> extends JPanel {
 	 * @since Envoy v0.1-beta
 	 */
 	public void selectElement(int index) {
+		final JComponent element = getComponent(index);
+
 		if (selection.contains(index)) {
 
 			// Remove selection of element at index
-			updateElement(index, false);
+			if (selectionHandler != null) selectionHandler.selectionChanged(model.get(index), element, true);
 			selection.remove(index);
 		} else {
 
@@ -141,7 +100,7 @@ public class ComponentList<E> extends JPanel {
 				selection.add(index);
 
 				// Update element
-				updateElement(index, true);
+				if (selectionHandler != null) selectionHandler.selectionChanged(model.get(index), element, true);
 			}
 		}
 
@@ -155,49 +114,25 @@ public class ComponentList<E> extends JPanel {
 	 * @since Envoy v0.1-alpha
 	 */
 	public void clearSelection() {
-		selection.forEach(i -> updateElement(i, false));
+		if (selectionHandler != null) selection.forEach(i -> selectionHandler.selectionChanged(model.get(i), getComponent(i), false));
 		selection.clear();
 	}
 
 	/**
 	 * Adds an object to the list by rendering it with the current
-	 * {@link ComponentListCellRenderer}.
+	 * {@link Renderer}.
 	 *
 	 * @param elem the element to add
 	 * @since Envoy v0.3-alpha
 	 */
-	void addElement(E elem) { addElement(elem, getComponentCount(), false); }
+	void addElement(E elem) {
-
-	/**
-	 * Adds an object to the list by rendering it with the current
-	 * {@link ComponentListRenderer}. If the renderer is {@code null}, no action is
-	 * performed.
-	 *
-	 * @param elem       the element to add
-	 * @param index      the index at which to add the element
-	 * @param isSelected the selection state of the element
-	 * @since Envoy v0.1-beta
-	 */
-	private void addElement(E elem, int index, boolean isSelected) {
 		if (renderer != null) {
-			final JComponent component = renderer.getListCellComponent(this, elem, isSelected);
+			final JComponent component = renderer.getListCellComponent(this, elem);
-			component.addMouseListener(getSelectionListener(index));
+			component.addMouseListener(getSelectionListener(getComponentCount()));
-			add(component, index);
+			add(component, getComponentCount());
 		}
 	}
 
-	/**
-	 * Replaces a list element with a newly rendered instance of its contents.
-	 *
-	 * @param index      the index of the element to update
-	 * @param isSelected the selection state passed to the {@link ListCellRenderer}
-	 * @since Envoy v0.1-beta
-	 */
-	private void updateElement(int index, boolean isSelected) {
-		remove(index);
-		addElement(model.get(index), index, isSelected);
-	}
-
 	/**
 	 * @param componentIndex the index of the list component to which the mouse
 	 *                       listener will be added
@@ -214,6 +149,9 @@ public class ComponentList<E> extends JPanel {
 		};
 	}
 
+	@Override
+	public JComponent getComponent(int n) { return (JComponent) super.getComponent(n); }
+
 	/**
 	 * @return a set of all selected indices
 	 * @since Envoy v0.1-beta
@@ -248,19 +186,45 @@ public class ComponentList<E> extends JPanel {
 	 * @return the model
 	 * @since Envoy v0.1-beta
 	 */
-	public ComponentListModel<E> getModel() { return model; }
+	public Model<E> getModel() { return model; }
+
+	/**
+	 * Sets the list model providing the list elements to render. The rendered
+	 * components will be synchronized with the contents of the new model or removed
+	 * if the new model is {@code null}.
+	 *
+	 * @param model the list model to set
+	 * @return this component list
+	 * @since Envoy v0.3-alpha
+	 */
+	public ComponentList<E> setModel(Model<E> model) {
+
+		// Remove old model
+		if (this.model != null) this.model.setComponentList(null);
+
+		// Synchronize with new model
+		this.model = model;
+		if (model != null) model.setComponentList(this);
+		synchronizeModel();
+
+		return this;
+	}
 
 	/**
 	 * @return the renderer
 	 * @since Envoy v0.1-beta
 	 */
-	public ComponentListCellRenderer<E> getRenderer() { return renderer; }
+	public Renderer<E> getRenderer() { return renderer; }
 
 	/**
 	 * @param renderer the renderer to set
+	 * @return this component list
 	 * @since Envoy v0.1-beta
 	 */
-	public void setRenderer(ComponentListCellRenderer<E> renderer) { this.renderer = renderer; }
+	public ComponentList<E> setRenderer(Renderer<E> renderer) {
+		this.renderer = renderer;
+		return this;
+	}
 
 	/**
 	 * @return the selection mode
@@ -269,8 +233,28 @@ public class ComponentList<E> extends JPanel {
 	public SelectionMode getSelectionMode() { return selectionMode; }
 
 	/**
+	 * Sets a new selection mode. The current selection will be cleared during this
+	 * action.
+	 * 
 	 * @param selectionMode the selection mode to set
+	 * @return this component list
 	 * @since Envoy v0.1-beta
 	 */
-	public void setSelectionMode(SelectionMode selectionMode) { this.selectionMode = selectionMode; }
+	public ComponentList<E> setSelectionMode(SelectionMode selectionMode) {
+		this.selectionMode = selectionMode;
+		clearSelection();
+		return this;
+	}
+
+	/**
+	 * @return the selection handler
+	 * @since Envoy v0.1-beta
+	 */
+	public SelectionHandler<E> getSelectionHandler() { return selectionHandler; }
+
+	/**
+	 * @param selectionHandler the selection handler to set
+	 * @since Envoy v0.1-beta
+	 */
+	public void setSelectionHandler(SelectionHandler<E> selectionHandler) { this.selectionHandler = selectionHandler; }
 }

src/main/java/envoy/client/ui/list/Model.java

@@ -9,19 +9,19 @@ import java.util.List;
  * Stores objects that will be displayed in a {@link ComponentList}.<br>
  * <br>
  * Project: <strong>envoy-client</strong><br>
- * File: <strong>ComponentListModel.java</strong><br>
+ * File: <strong>Model.java</strong><br>
  * Created: <strong>25.01.2020</strong><br>
  *
  * @param <E> the type of object displayed in this list
  * @author Kai S. K. Engelbart
  * @since Envoy v0.3-alpha
  */
-public final class ComponentListModel<E> implements Iterable<E>, Serializable {
+public final class Model<E> implements Iterable<E>, Serializable {
 
 	private List<E>						elements	= new ArrayList<>();
 	transient private ComponentList<E>	componentList;
 
-	private static final long serialVersionUID = 4815005915255497331L;
+	private static final long serialVersionUID = 0L;
 
 	/**
 	 * Adds an element to this model and notifies the associated

src/main/java/envoy/client/ui/list/Renderer.java

@@ -7,14 +7,15 @@ import javax.swing.JComponent;
  * that can be rendered.<br>
  * <br>
  * Project: <strong>envoy-client</strong><br>
- * File: <strong>ComponentListCellRenderer.java</strong><br>
+ * File: <strong>Renderer.java</strong><br>
  * Created: <strong>25.01.2020</strong><br>
  *
  * @param <E> the type of object displayed in this list
  * @author Kai S. K. Engelbart
  * @since Envoy v0.3-alpha
  */
-public interface ComponentListCellRenderer<E> {
+@FunctionalInterface
+public interface Renderer<E> {
 
 	/**
 	 * Provides a Swing component representing a list element.
@@ -26,5 +27,5 @@ public interface ComponentListCellRenderer<E> {
 	 * @return the component representing the list element
 	 * @since Envoy v0.3-alpha
 	 */
-	JComponent getListCellComponent(ComponentList<? extends E> list, E value, boolean isSelected);
+	JComponent getListCellComponent(ComponentList<? extends E> list, E value);
 }

src/main/java/envoy/client/ui/list/SelectionHandler.java

@@ -0,0 +1,27 @@
+package envoy.client.ui.list;
+
+import javax.swing.JComponent;
+
+/**
+ * Handles the selection of elements in a {@link ComponentList}.<br>
+ * <br>
+ * Project: <strong>envoy-client</strong>
+ * File: <strong>SelectionHandler.java</strong>
+ * Created: <strong>21.03.2020</strong>
+ *
+ * @author Kai S. K. Engelbart
+ * @since Envoy v0.1-beta
+ */
+@FunctionalInterface
+public interface SelectionHandler<E> {
+
+	/**
+	 * Notifies the handler about a selection.
+	 * 
+	 * @param element the selected element
+	 * @param component the selected component
+	 * @param isSelected contains the selection state
+	 * @since Envoy v0.1-beta
+	 */
+	void selectionChanged(E element, JComponent component, boolean isSelected);
+}

src/main/java/envoy/client/ui/primary/PrimaryScrollBar.java

@@ -1,11 +1,6 @@
 package envoy.client.ui.primary;
 
-import java.awt.Color;
+import java.awt.*;
-import java.awt.Dimension;
-import java.awt.Graphics;
-import java.awt.Graphics2D;
-import java.awt.Rectangle;
-import java.awt.RenderingHints;
 
 import javax.swing.JButton;
 import javax.swing.JComponent;
@@ -98,11 +93,11 @@ public class PrimaryScrollBar extends BasicScrollBarUI {
 		g2.setPaint(color);
 		if (isVertical) {
 			g2.fillRoundRect(r.x - 9, r.y, r.width, r.height, arcSize, arcSize);
-			g2.setPaint(Settings.getInstance().getThemes().get(Settings.getInstance().getCurrentTheme()).getCellColor());
+			g2.setPaint(Settings.getInstance().getCurrentTheme().getCellColor());
 			g2.drawRoundRect(r.x - 9, r.y, r.width, r.height, arcSize, arcSize);
 		} else {
 			g2.fillRoundRect(r.x, r.y + 9, r.width, r.height - 10, arcSize, arcSize);
-			g2.setPaint(Settings.getInstance().getThemes().get(Settings.getInstance().getCurrentTheme()).getCellColor());
+			g2.setPaint(Settings.getInstance().getCurrentTheme().getCellColor());
 			g2.drawRoundRect(r.x, r.y + 9, r.width, r.height - 10, arcSize, arcSize);
 		}
 		g2.dispose();

src/main/java/envoy/client/ui/primary/PrimaryToggleSwitch.java

@@ -52,7 +52,7 @@ public class PrimaryToggleSwitch extends JButton {
 		g.setColor(state ? Color.GREEN : Color.LIGHT_GRAY);
 		g.fillRoundRect(0, 0, getWidth(), getHeight(), 25, 25);
 
-		g.setColor(Settings.getInstance().getThemes().get(Settings.getInstance().getCurrentTheme()).getInteractableBackgroundColor());
+		g.setColor(Settings.getInstance().getCurrentTheme().getInteractableBackgroundColor());
 		g.fillRoundRect(state ? 25 : 0, 0, 25, 25, 25, 25);
 	}
 }

src/main/java/envoy/client/ui/renderer/UserComponentListRenderer.java

@@ -1,70 +0,0 @@
-package envoy.client.ui.renderer;
-
-import java.awt.BorderLayout;
-import java.awt.Dimension;
-import java.io.Serializable;
-
-import javax.swing.JComponent;
-import javax.swing.JLabel;
-import javax.swing.JPanel;
-
-import envoy.client.data.Settings;
-import envoy.client.ui.Color;
-import envoy.client.ui.Theme;
-import envoy.client.ui.list.ComponentList;
-import envoy.client.ui.list.ComponentListCellRenderer;
-import envoy.data.User;
-import envoy.data.User.UserStatus;
-
-/**
- * Project: <strong>envoy-client</strong><br>
- * File: <strong>UserComponentListRenderer.java</strong><br>
- * Created: <strong>15 Mar 2020</strong><br>
- *
- * @author Leon Hofmeister
- * @since Envoy v0.1-beta
- */
-public class UserComponentListRenderer implements ComponentListCellRenderer<User>, Serializable {
-
-	private static final long serialVersionUID = -2379244319112111284L;
-
-	@Override
-	public JComponent getListCellComponent(ComponentList<? extends User> list, User user, boolean isSelected) {
-		final Theme theme = Settings.getInstance().getThemes().get(Settings.getInstance().getCurrentTheme());
-
-		final JPanel panel = new JPanel();
-		panel.setLayout(new BorderLayout());
-
-		// Panel background
-		panel.setBackground(isSelected ? theme.getSelectionColor() : theme.getCellColor());
-		panel.setOpaque(true);
-		panel.setPreferredSize(new Dimension(100, 35));
-
-		// TODO add profile picture support in BorderLayout.West
-
-		JLabel username = new JLabel(user.getName());
-		username.setForeground(theme.getUserNameColor());
-		panel.add(username, BorderLayout.CENTER);
-
-		final UserStatus	status		= user.getStatus();
-		JLabel				statusLabel	= new JLabel(status.toString());
-		Color				foreground;
-		switch (status) {
-			case AWAY:
-				foreground = Color.yellow;
-				break;
-			case BUSY:
-				foreground = Color.blue;
-				break;
-			case ONLINE:
-				foreground = Color.green;
-				break;
-			default:
-				foreground = Color.lightGray;
-				break;
-		}
-		statusLabel.setForeground(foreground);
-		panel.add(statusLabel, BorderLayout.NORTH);
-		return panel;
-	}
-}

src/main/java/envoy/client/ui/renderer/UserListRenderer.java

@@ -46,7 +46,7 @@ public class UserListRenderer extends JLabel implements ListCellRenderer<User> {
 
 		// Getting the UserNameColor of the current theme
 		String textColor = null;
-		textColor = Settings.getInstance().getThemes().get(Settings.getInstance().getCurrentTheme()).getUserNameColor().toHex();
+		textColor = Settings.getInstance().getCurrentTheme().getUserNameColor().toHex();
 		switch (status) {
 			case ONLINE:
 				setText(String

src/main/java/envoy/client/ui/settings/GeneralSettingsPanel.java

@@ -43,7 +43,7 @@ public class GeneralSettingsPanel extends SettingsPanel {
 	 */
 	public GeneralSettingsPanel(SettingsScreen parent) {
 		super(parent);
-		theme = Settings.getInstance().getThemes().get(Settings.getInstance().getCurrentTheme());
+		theme = Settings.getInstance().getCurrentTheme();
 
 		setBackground(theme.getCellColor());
 

src/main/java/envoy/client/ui/settings/NewThemeScreen.java

@@ -61,7 +61,7 @@ public class NewThemeScreen extends JDialog {
 		setDimensions(true);
 		setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
 
-		Theme theme = Settings.getInstance().getThemes().get(Settings.getInstance().getCurrentTheme());
+		Theme theme = Settings.getInstance().getCurrentTheme();
 
 		getContentPane().setLayout(new BorderLayout());
 		standardPanel.setBackground(theme.getBackgroundColor());

src/main/java/envoy/client/ui/settings/SettingsScreen.java

@@ -156,7 +156,7 @@ public class SettingsScreen extends JDialog {
 		}
 
 		// Apply current theme
-		applyTheme(Settings.getInstance().getThemes().get(Settings.getInstance().getCurrentTheme()));
+		applyTheme(Settings.getInstance().getCurrentTheme());
 
 		// Respond to theme changes
 		EventBus.getInstance().register(ThemeChangeEvent.class, evt -> applyTheme(evt.get()));

src/main/java/envoy/client/ui/settings/ThemeCustomizationPanel.java

@@ -38,8 +38,9 @@ public class ThemeCustomizationPanel extends SettingsPanel {
 
 	private final Insets insets = new Insets(5, 5, 5, 5);
 
-	private static final Logger	logger				= EnvoyLog.getLogger(ThemeCustomizationPanel.class);
+	private static final Settings	settings			= Settings.getInstance();
-	private static final long	serialVersionUID	= -8697897390666456624L;
+	private static final Logger		logger				= EnvoyLog.getLogger(ThemeCustomizationPanel.class);
+	private static final long		serialVersionUID	= -8697897390666456624L;
 
 	/**
 	 * Initializes a {@link ThemeCustomizationPanel} that enables the user to change
@@ -52,7 +53,7 @@ public class ThemeCustomizationPanel extends SettingsPanel {
 	 */
 	public ThemeCustomizationPanel(SettingsScreen parent) {
 		super(parent);
-		temporaryTheme = new Theme("temporaryTheme", Settings.getInstance().getThemes().get(Settings.getInstance().getCurrentTheme()));
+		temporaryTheme = new Theme("temporaryTheme", settings.getCurrentTheme());
 
 		GridBagLayout gbl_themeLayout = new GridBagLayout();
 
@@ -63,7 +64,7 @@ public class ThemeCustomizationPanel extends SettingsPanel {
 
 		setLayout(gbl_themeLayout);
 
-		themes.setSelectedItem(Settings.getInstance().getCurrentTheme());
+		themes.setSelectedItem(settings.getCurrentTheme());
 
 		GridBagConstraints gbc_themes = new GridBagConstraints();
 		gbc_themes.fill			= GridBagConstraints.HORIZONTAL;
@@ -83,7 +84,7 @@ public class ThemeCustomizationPanel extends SettingsPanel {
 
 		colorsPanel.setLayout(gbl_colorCustomizations);
 
-		Theme theme = Settings.getInstance().getThemes().get(Settings.getInstance().getCurrentTheme());
+		Theme theme = settings.getCurrentTheme();
 		buildCustomizeElements(theme);
 
 		GridBagConstraints gbc_colorsPanel = new GridBagConstraints();