Darken the dark theme, and hover a tree row like a menu

The client's own look-and-feel defaults now live beside LookAndFeelManager as
FlatLaf properties files, which FlatLaf loads on top of each theme's own,
instead of a handful of UIManager.put calls.

The dark theme is built on three surfaces keyed to the toolbar's #282828: the
window chrome, the tab strips and menu bar one step below it at #232323, and
the content the client shows — channel tree, chat log, text fields, lists — at
#1e1e1e. Selections are #364b6f, and channel names in the tree are white; the
chat lines about server events keep the blue they had, which channel names no
longer carry. Everything FlatLaf derives (borders, scroll bars, hover states)
follows from those.

A read-only editor pane is a chat log or an information view here, not a
disabled input, so it keeps the content background rather than FlatLaf's
inactive one; and since neither a text view nor a tree fills its viewport, the
space below the last line takes their background instead of the window's.

The row under the pointer is now washed in the same colour a hovered menu is,
rather than outlined. FlatLaf states that colour as a shift of the surface
beneath it, so it is resolved against the window background exactly as the
menu bar resolves it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

ts3-client/swing/src/main/java/com/ts3client/ui/ChatPanel.java

@@ -318,6 +318,7 @@ public final class ChatPanel extends JPanel {
             });
 
             scroll = new JScrollPane(log);
+            HtmlStyles.fillViewport(log);
             scroll.setBorder(BorderFactory.createEmptyBorder());
         }
 

ts3-client/swing/src/main/java/com/ts3client/ui/DropIndicatorTree.java

@@ -148,9 +148,9 @@ final class DropIndicatorTree extends JTree {
         g.setColor(getBackground());
         g.fillRect(clip.x, clip.y, clip.width, clip.height);
         paintSelection(g);
+        paintHover(g);
         super.paintComponent(g);
         paintBadges(g);
-        paintHover(g);
         JTree.DropLocation loc = getDropLocation();
         if (loc == null || loc.getPath() == null) return;
 
@@ -190,22 +190,19 @@ final class DropIndicatorTree extends JTree {
     }
 
     /**
-     * Outlines the row under the pointer, across the full width the row occupies —
-     * the same area a click on it acts on. Spacers, which nothing can be done with,
-     * are left alone.
+     * Washes the row under the pointer across the full width it occupies — the same
+     * area a click on it acts on. A selected row keeps its selection colour, and
+     * spacers, which nothing can be done with, are left alone.
      */
     private void paintHover(Graphics g) {
-        if (hoverRow < 0 || getDropLocation() != null) return;
+        if (hoverRow < 0 || getDropLocation() != null || isRowSelected(hoverRow)) return;
         Rectangle bounds = getRowBounds(hoverRow);
         TreePath path = getPathForRow(hoverRow);
         if (bounds == null || path == null || isSpacer(path)) return;
 
         Rectangle visible = getVisibleRect();
-        Graphics2D g2 = (Graphics2D) g.create();
-        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
-        g2.setColor(Theme.treeHover());
-        g2.drawRoundRect(visible.x, bounds.y, visible.width - 1, bounds.height - 1, 4, 4);
-        g2.dispose();
+        g.setColor(Theme.hover());
+        g.fillRect(visible.x, bounds.y, visible.width, bounds.height);
     }
 
     private boolean isSpacer(TreePath path) {

ts3-client/swing/src/main/java/com/ts3client/ui/HtmlStyles.java

@@ -3,6 +3,7 @@ package com.ts3client.ui;
 import com.ts3client.text.BBCode;
 
 import javax.swing.JEditorPane;
+import javax.swing.JViewport;
 import javax.swing.SwingUtilities;
 import javax.swing.text.html.HTMLEditorKit;
 import javax.swing.text.html.StyleSheet;
@@ -42,6 +43,17 @@ final class HtmlStyles {
         return pane;
     }
 
+    /**
+     * Paints the scroll pane {@code pane} sits in with the pane's own background: text
+     * only reaches as far as it goes, and the empty space below it would otherwise show
+     * the window's colour instead of the log's.
+     */
+    static void fillViewport(JEditorPane pane) {
+        if (pane.getParent() instanceof JViewport viewport) {
+            viewport.setBackground(pane.getBackground());
+        }
+    }
+
     /** Re-themes {@code pane}, keeping the text it shows. */
     private static void restyle(JEditorPane pane) {
         // Also runs from JEditorPane's constructor, before the pane is one of ours.
@@ -68,7 +80,7 @@ final class HtmlStyles {
         // about what happened on the server.
         css.addRule(".muted { color:" + hex(Theme.chatSystem()) + "; }");
         css.addRule(".name { color:" + hex(Theme.chatName()) + "; font-weight:bold; }");
-        css.addRule(".event { color:" + hex(Theme.channelText()) + "; }");
+        css.addRule(".event { color:" + hex(Theme.chatEvent()) + "; }");
         css.addRule("a { color:" + hex(Theme.chatName()) + "; text-decoration:none; }");
         // Client references look exactly like a message author's name.
         css.addRule("a." + BBCode.IDENTITY_LINK_CLASS
@@ -83,6 +95,7 @@ final class HtmlStyles {
         kit.setStyleSheet(css);
 
         pane.setEditorKit(kit);
+        fillViewport(pane);
         if (html != null) {
             pane.setText(html);
             pane.setCaretPosition(atEnd ? pane.getDocument().getLength() : 0);

ts3-client/swing/src/main/java/com/ts3client/ui/InfoPanel.java

@@ -55,6 +55,7 @@ public final class InfoPanel extends JScrollPane {
             }
         });
         setViewportView(pane);
+        HtmlStyles.fillViewport(pane);
         clear();
     }
 

ts3-client/swing/src/main/java/com/ts3client/ui/LookAndFeelManager.java

@@ -5,29 +5,34 @@ import com.formdev.flatlaf.FlatLaf;
 import com.formdev.flatlaf.FlatLightLaf;
 import com.ts3client.config.Settings;
 
-import javax.swing.UIManager;
 import java.awt.Window;
 
 /**
  * Installs FlatLaf in the requested variant and keeps {@link Theme} in step with it.
  *
- * <p>Also carries the few look-and-feel defaults the client wants everywhere: rounded
- * controls, a slimmer tree row and scroll bars that only show their thumb.
+ * <p>The client's own look-and-feel defaults — rounded controls, and the darker palette
+ * the dark theme is built on — live beside this class as FlatLaf properties files, which
+ * FlatLaf loads on top of the theme's own.
  */
 public final class LookAndFeelManager {
 
+    /** Where our own FlatLaf properties files sit. */
+    private static final String DEFAULTS_PACKAGE = "com.ts3client.ui.laf";
+
+    static {
+        // Registered once: FlatLaf keeps every registration, and install() runs again on
+        // each theme switch.
+        FlatLaf.registerCustomDefaultsSource(DEFAULTS_PACKAGE);
+    }
+
     private LookAndFeelManager() {
     }
 
     /** Installs the look-and-feel for {@code appearance}. Call before building any window. */
     public static void install(Settings.Appearance appearance) {
         FlatLaf laf = appearance == Settings.Appearance.DARK ? new FlatDarkLaf() : new FlatLightLaf();
-        if (!FlatLaf.setup(laf)) {
-            // Leave whatever look-and-feel is installed; Theme falls back to its own palette.
-            Theme.refresh();
-            return;
-        }
-        applyDefaults();
+        // Whatever look-and-feel stays installed on failure, Theme falls back to its own palette.
+        FlatLaf.setup(laf);
         Theme.refresh();
     }
 
@@ -43,17 +48,4 @@ public final class LookAndFeelManager {
             w.repaint();
         }
     }
-
-    private static void applyDefaults() {
-        UIManager.put("Component.focusWidth", 1);
-        UIManager.put("Component.arc", 6);
-        UIManager.put("Button.arc", 6);
-        UIManager.put("ScrollBar.showButtons", false);
-        UIManager.put("ScrollBar.thumbArc", 8);
-        UIManager.put("ScrollBar.trackArc", 8);
-        UIManager.put("TabbedPane.tabHeight", 26);
-        UIManager.put("Tree.rowHeight", 0);
-        UIManager.put("Tree.paintLines", false);
-    }
-
 }

ts3-client/swing/src/main/java/com/ts3client/ui/ServerTreePanel.java

@@ -161,7 +161,6 @@ public final class ServerTreePanel extends JScrollPane {
         tree.setPathEditable(nicknameEditor::editsPath);
         tree.setInvokesStopCellEditing(true);
         setViewportView(tree);
-        getViewport().setBackground(Theme.treeBg());
         // The icon strip is drawn against the viewport's right edge, so the blitted
         // pixels a scroll would reuse are stale; repaint the whole viewport instead.
         getViewport().setScrollMode(JViewport.SIMPLE_SCROLL_MODE);
@@ -279,6 +278,14 @@ public final class ServerTreePanel extends JScrollPane {
         ChannelMenu.build(channel, actions).show(tree, e.getX(), e.getY());
     }
 
+    @Override
+    public void updateUI() {
+        super.updateUI();
+        // The rows stop at the last channel, so the space below them belongs to the tree
+        // rather than to the window behind it.
+        if (getViewport() != null) getViewport().setBackground(Theme.treeBg());
+    }
+
     /** The path of the tree node showing {@code target}, or {@code null}. */
     private TreePath pathOf(Object target) {
         java.util.Enumeration<?> nodes = root.breadthFirstEnumeration();

ts3-client/swing/src/main/java/com/ts3client/ui/Theme.java

@@ -1,5 +1,7 @@
 package com.ts3client.ui;
 
+import com.formdev.flatlaf.ui.FlatUIUtils;
+
 import javax.swing.UIManager;
 import java.awt.Color;
 import java.awt.Font;
@@ -44,11 +46,11 @@ public final class Theme {
     // ---- surfaces, from the look-and-feel ----
 
     public static Color windowBg() {
-        return ui("Panel.background", 0xF0F0F0, 0x3C3F41);
+        return ui("Panel.background", 0xF0F0F0, 0x282828);
     }
 
     public static Color toolbarBg() {
-        return ui("ToolBar.background", 0xE6E9ED, 0x3C3F41);
+        return ui("ToolBar.background", 0xE6E9ED, 0x282828);
     }
 
     public static Color statusBg() {
@@ -56,42 +58,52 @@ public final class Theme {
     }
 
     public static Color treeBg() {
-        return ui("Tree.background", 0xFFFFFF, 0x2B2B2B);
+        return ui("Tree.background", 0xFFFFFF, 0x1E1E1E);
     }
 
     public static Color treeText() {
-        return ui("Tree.foreground", 0x1E1E1E, 0xDFE1E5);
+        return ui("Tree.foreground", 0x1E1E1E, 0xE0E0E0);
     }
 
     public static Color treeSelection() {
-        return ui("Tree.selectionBackground", 0xCFE3FB, 0x2F5075);
+        return ui("Tree.selectionBackground", 0xCFE3FB, 0x364B6F);
     }
 
-    /** Outline drawn around the row the pointer is over. */
-    public static Color treeHover() {
-        return pick(0x9CC4EE, 0x4A6E96);
+    /**
+     * Behind the row the pointer is over: the same wash the menu bar puts behind a hovered
+     * menu. The look-and-feel states it as a shift of whatever surface it sits on, and the
+     * menu bar resolves it against the window, so this does too — a row hover and a menu
+     * hover then carry the very same colour.
+     */
+    public static Color hover() {
+        return FlatUIUtils.deriveColor(ui("MenuBar.hoverBackground", 0xE6E6E6, 0x3D3D3D), windowBg());
     }
 
     public static Color chatBg() {
-        return ui("TextPane.background", 0xFAFAFA, 0x2B2B2B);
+        return ui("TextPane.background", 0xFAFAFA, 0x1E1E1E);
     }
 
     public static Color border() {
-        return ui("Component.borderColor", 0xD0D0D0, 0x4B4B4B);
+        return ui("Component.borderColor", 0xD0D0D0, 0x3E3E3E);
     }
 
     public static Color chatText() {
-        return ui("TextPane.foreground", 0x202020, 0xDFE1E5);
+        return ui("TextPane.foreground", 0x202020, 0xE0E0E0);
     }
 
     // ---- status colours ----
 
     public static Color channelText() {
+        return pick(0x21486B, 0xFFFFFF);
+    }
+
+    /** The colour of a chat line about what happened on the server. */
+    public static Color chatEvent() {
         return pick(0x21486B, 0x8FBCE6);
     }
 
     public static Color serverText() {
-        return pick(0x123456, 0xB9D4F0);
+        return pick(0x123456, 0xDCE8F5);
     }
 
     public static Color talking() {

ts3-client/swing/src/main/resources/com/ts3client/ui/laf/FlatDarkLaf.properties

@@ -0,0 +1,17 @@
+#
+# A darker dark theme than FlatLaf's own, keyed to the toolbar's #282828.
+#
+# Three levels of surface: the window chrome (toolbar, panels, status bar) at
+# @background, the tab strips one step below it, and the content the client shows
+# (channel tree, chat log, text fields, lists) one step below those.
+#
+
+@background = #282828
+@foreground = #e0e0e0
+@componentBackground = #1e1e1e
+@menuBackground = #232323
+
+# Selected channel tree row, and every other selection with it.
+@selectionBackground = #364b6f
+
+TabbedPane.background = #232323

ts3-client/swing/src/main/resources/com/ts3client/ui/laf/FlatLaf.properties

@@ -0,0 +1,14 @@
+#
+# Look-and-feel defaults for both themes. Loaded by FlatLaf itself, on top of the
+# theme's own properties; see LookAndFeelManager.
+#
+
+# Softer corners than FlatLaf's default, and a tab strip with room to breathe.
+Component.arc = 6
+Button.arc = 6
+Component.focusWidth = 1
+TabbedPane.tabHeight = 26
+
+# A read-only editor pane is a chat log or an information view here, not a disabled
+# input, so it keeps the content background instead of the window's.
+EditorPane.inactiveBackground = @componentBackground