fixed background color

src/main/java/com/kfmanager/ui/FilePanel.java

@@ -505,7 +505,8 @@ public class FilePanel extends JPanel {
     }
 
     public void applyBackgroundColor(Color bg) {
-        setBackground(bg);
+        if (bg == null) return;
+        updateComponentBackground(this, bg);
         for (int i = 0; i < tabbedPane.getTabCount(); i++) {
             Component c = tabbedPane.getComponentAt(i);
             if (c instanceof FilePanelTab) {
@@ -514,6 +515,28 @@ public class FilePanel extends JPanel {
         }
     }
 
+    private void updateComponentBackground(Container container, Color bg) {
+        if (container == null) return;
+        container.setBackground(bg);
+        boolean dark = isDark(bg);
+        for (Component c : container.getComponents()) {
+            if (c instanceof JPanel || c instanceof JToolBar || c instanceof JScrollPane || c instanceof JViewport || c instanceof JTabbedPane) {
+                c.setBackground(bg);
+            } else if (c instanceof JLabel || c instanceof JCheckBox || c instanceof JRadioButton) {
+                c.setForeground(dark ? Color.WHITE : Color.BLACK);
+            }
+            if (c instanceof Container) {
+                updateComponentBackground((Container) c, bg);
+            }
+        }
+    }
+
+    private boolean isDark(Color c) {
+        if (c == null) return false;
+        double darkness = 1 - (0.299 * c.getRed() + 0.587 * c.getGreen() + 0.114 * c.getBlue()) / 255;
+        return darkness >= 0.5;
+    }
+
     public void applySelectionColor(Color sel) {
         for (int i = 0; i < tabbedPane.getTabCount(); i++) {
             Component c = tabbedPane.getComponentAt(i);

src/main/java/com/kfmanager/ui/FilePanelTab.java

@@ -124,12 +124,34 @@ public class FilePanelTab extends JPanel {
 
     public void applyBackgroundColor(Color bg) {
         if (bg == null) return;
-        setBackground(bg);
+        updateComponentBackground(this, bg);
         fileTable.setBackground(bg);
         statusLabel.setBackground(bg);
         repaint();
     }
 
+    private void updateComponentBackground(Container container, Color bg) {
+        if (container == null) return;
+        container.setBackground(bg);
+        boolean dark = isDark(bg);
+        for (Component c : container.getComponents()) {
+            if (c instanceof JPanel || c instanceof JToolBar || c instanceof JScrollPane || c instanceof JViewport || c instanceof JTabbedPane) {
+                c.setBackground(bg);
+            } else if (c instanceof JLabel || c instanceof JCheckBox || c instanceof JRadioButton) {
+                c.setForeground(dark ? Color.WHITE : Color.BLACK);
+            }
+            if (c instanceof Container) {
+                updateComponentBackground((Container) c, bg);
+            }
+        }
+    }
+
+    private boolean isDark(Color c) {
+        if (c == null) return false;
+        double darkness = 1 - (0.299 * c.getRed() + 0.587 * c.getGreen() + 0.114 * c.getBlue()) / 255;
+        return darkness >= 0.5;
+    }
+
     public void applySelectionColor(Color sel) {
         if (sel == null) return;
         this.selectionColor = sel;
@@ -1239,6 +1261,7 @@ public class FilePanelTab extends JPanel {
                     Font baseFont = table.getFont();
                     if (baseFont == null) baseFont = getFont();
                     int baseStyle = baseFont != null ? baseFont.getStyle() : Font.PLAIN;
+                    
                     if (isMarked) {
                         // Ensure marked items are at least bold, preserve italic if present
                         int newStyle = baseStyle | Font.BOLD;
@@ -1247,8 +1270,12 @@ public class FilePanelTab extends JPanel {
                     } else {
                         // Preserve whatever style the base font has (do not force plain)
                         setFont(baseFont.deriveFont(baseStyle));
-                        // Use a white foreground color for better contrast on dark backgrounds
+                        // Automatically adjust foreground contrast
-                        setForeground(new Color(255, 255, 255));
+                        if (isCurrentCell && table.hasFocus()) {
+                            setForeground(isDark(selectionColor) ? Color.WHITE : Color.BLACK);
+                        } else {
+                            setForeground(isDark(FilePanelTab.this.getBackground()) ? Color.WHITE : Color.BLACK);
+                        }
                     }
                     
                     // Zobrazit ikonu pro názvy souborů

src/main/java/com/kfmanager/ui/MainWindow.java

@@ -320,6 +320,7 @@ public class MainWindow extends JFrame {
     // Settings menu
     JMenu settingsMenu = new JMenu("Settings");
     JMenuItem appearanceItem = new JMenuItem("Appearance...");
+        appearanceItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.ALT_DOWN_MASK));
         appearanceItem.addActionListener(e -> showSettingsDialog());
     settingsMenu.add(appearanceItem);
         
@@ -373,7 +374,7 @@ public class MainWindow extends JFrame {
         Color bg = config.getBackgroundColor();
         if (bg != null) {
             SwingUtilities.invokeLater(() -> {
-                getContentPane().setBackground(bg);
+                updateComponentBackground(getContentPane(), bg);
                 if (leftPanel != null) leftPanel.applyBackgroundColor(bg);
                 if (rightPanel != null) rightPanel.applyBackgroundColor(bg);
             });
@@ -401,6 +402,29 @@ public class MainWindow extends JFrame {
             } catch (Exception ignore) {}
         });
     }
+
+    private void updateComponentBackground(Container container, Color bg) {
+        if (container == null) return;
+        container.setBackground(bg);
+        boolean dark = isDark(bg);
+        for (Component c : container.getComponents()) {
+            if (c instanceof JPanel || c instanceof JToolBar || c instanceof JScrollPane || c instanceof JViewport || c instanceof JTabbedPane || c instanceof JButton) {
+                c.setBackground(bg);
+            }
+            if (c instanceof JLabel || c instanceof JCheckBox || c instanceof JRadioButton || c instanceof JButton) {
+                c.setForeground(dark ? Color.WHITE : Color.BLACK);
+            }
+            if (c instanceof Container) {
+                updateComponentBackground((Container) c, bg);
+            }
+        }
+    }
+
+    private boolean isDark(Color c) {
+        if (c == null) return false;
+        double darkness = 1 - (0.299 * c.getRed() + 0.587 * c.getGreen() + 0.114 * c.getBlue()) / 255;
+        return darkness >= 0.5;
+    }
     
     /**
      * Setup keyboard shortcuts
@@ -433,6 +457,11 @@ public class MainWindow extends JFrame {
                 KeyStroke.getKeyStroke(KeyEvent.VK_F9, InputEvent.ALT_DOWN_MASK),
                 JComponent.WHEN_IN_FOCUSED_WINDOW);
         
+    // Alt+O - Settings
+        rootPane.registerKeyboardAction(e -> showSettingsDialog(),
+                KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.ALT_DOWN_MASK),
+                JComponent.WHEN_IN_FOCUSED_WINDOW);
+        
     // F6 - Move
         rootPane.registerKeyboardAction(e -> moveFiles(),
                 KeyStroke.getKeyStroke(KeyEvent.VK_F6, 0),
@@ -1027,6 +1056,7 @@ public class MainWindow extends JFrame {
             "F9 / Shift+F6 - Rename\n" +
             "TAB - Switch panel\n" +
             "Ctrl+F - Search\n" +
+            "Alt+O - Settings\n" +
             "Enter - Open directory\n" +
             "Backspace - Parent directory",
         "About",

src/main/java/com/kfmanager/ui/SettingsDialog.java

@@ -18,6 +18,13 @@ public class SettingsDialog extends JDialog {
     private final JPanel cards;
     private final CardLayout cardLayout;
 
+    // Original values for cancellation
+    private final Color originalBg;
+    private final Color originalSel;
+    private final Color originalMark;
+    private final Font originalGlobalFont;
+    private final Font originalEditorFont;
+
     // Appearance controls
     private JButton appearanceFontBtn;
     private JButton appearanceBgBtn;
@@ -35,6 +42,13 @@ public class SettingsDialog extends JDialog {
         this.config = config;
         this.onChange = onChange;
 
+        // Store original values
+        this.originalBg = config.getBackgroundColor();
+        this.originalSel = config.getSelectionColor();
+        this.originalMark = config.getMarkedColor();
+        this.originalGlobalFont = config.getGlobalFont();
+        this.originalEditorFont = config.getEditorFont();
+
         setDefaultCloseOperation(DISPOSE_ON_CLOSE);
         setSize(700, 420);
         setLocationRelativeTo(parent);
@@ -139,7 +153,19 @@ public class SettingsDialog extends JDialog {
             dispose();
         });
         JButton cancel = new JButton("Cancel");
-        cancel.addActionListener(e -> dispose());
+        cancel.addActionListener(e -> {
+            // Restore original values
+            config.setBackgroundColor(originalBg);
+            config.setSelectionColor(originalSel);
+            config.setMarkedColor(originalMark);
+            config.setGlobalFont(originalGlobalFont);
+            config.setEditorFont(originalEditorFont);
+            
+            // Notify UI to revert changes
+            if (onChange != null) onChange.run();
+            
+            dispose();
+        });
         btns.add(ok);
         btns.add(cancel);
         add(btns, BorderLayout.SOUTH);
@@ -164,13 +190,16 @@ public class SettingsDialog extends JDialog {
 
         grid.add(new JLabel("Background color:"));
         appearanceBgBtn = new JButton();
+        appearanceBgBtn.setOpaque(true);
+        appearanceBgBtn.setContentAreaFilled(false);
+        appearanceBgBtn.setBorder(BorderFactory.createLineBorder(Color.GRAY));
         Color bg = config.getBackgroundColor();
         appearanceBgBtn.setBackground(bg != null ? bg : UIManager.getColor("Panel.background"));
         appearanceBgBtn.addActionListener(e -> {
             Color chosen = JColorChooser.showDialog(this, "Choose background color", appearanceBgBtn.getBackground());
             if (chosen != null) {
-                appearanceBgBtn.setBackground(chosen);
                 config.setBackgroundColor(chosen);
+                appearanceBgBtn.setBackground(chosen);
                 if (onChange != null) onChange.run();
             }
         });
@@ -178,13 +207,16 @@ public class SettingsDialog extends JDialog {
 
         grid.add(new JLabel("Selection color:"));
         appearanceSelBtn = new JButton();
+        appearanceSelBtn.setOpaque(true);
+        appearanceSelBtn.setContentAreaFilled(false);
+        appearanceSelBtn.setBorder(BorderFactory.createLineBorder(Color.GRAY));
         Color sel = config.getSelectionColor();
         appearanceSelBtn.setBackground(sel != null ? sel : new Color(184, 207, 229));
         appearanceSelBtn.addActionListener(e -> {
             Color chosen = JColorChooser.showDialog(this, "Choose selection color", appearanceSelBtn.getBackground());
             if (chosen != null) {
-                appearanceSelBtn.setBackground(chosen);
                 config.setSelectionColor(chosen);
+                appearanceSelBtn.setBackground(chosen);
                 if (onChange != null) onChange.run();
             }
         });
@@ -192,13 +224,16 @@ public class SettingsDialog extends JDialog {
 
         grid.add(new JLabel("Marked item color:"));
         appearanceMarkBtn = new JButton();
+        appearanceMarkBtn.setOpaque(true);
+        appearanceMarkBtn.setContentAreaFilled(false);
+        appearanceMarkBtn.setBorder(BorderFactory.createLineBorder(Color.GRAY));
         Color mark = config.getMarkedColor();
         appearanceMarkBtn.setBackground(mark != null ? mark : new Color(204, 153, 0));
         appearanceMarkBtn.addActionListener(e -> {
             Color chosen = JColorChooser.showDialog(this, "Choose marked item color", appearanceMarkBtn.getBackground());
             if (chosen != null) {
-                appearanceMarkBtn.setBackground(chosen);
                 config.setMarkedColor(chosen);
+                appearanceMarkBtn.setBackground(chosen);
                 if (onChange != null) onChange.run();
             }
         });