Add unified font control system with auto-regeneration

- Add open file button for direct audio file selection
- Implement clustered FontControlWidget with font selector, size slider, and refresh controls
- Add auto-regeneration of matplotlib plots when fonts change
- Enhance FontManager with system font discovery and startup selection logic
- Replace individual font selector with comprehensive font control interface
- Support both custom fonts and system font candidates with proper prioritization

🤖 Generated with [Claude Code](https://claude.ai/code)

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

font_control_widget.py

@@ -0,0 +1,336 @@
+"""
+Unified font control widget clustering all font-related manipulators.
+Self-contained widget for easy layout management.
+"""
+
+import logging
+from typing import List, Dict, Optional
+from PyQt5.QtWidgets import (QWidget, QComboBox, QVBoxLayout, QHBoxLayout, 
+                            QLabel, QSlider, QPushButton, QGroupBox)
+from PyQt5.QtCore import pyqtSignal, Qt
+
+from font_manager import get_font_manager
+
+
+class FontControlWidget(QWidget):
+    """
+    Unified font control widget containing all font-related manipulators.
+    
+    Provides clustered interface for:
+    - Font selection (unified for Qt and matplotlib)
+    - Qt font size adjustment
+    - Plot regeneration controls
+    """
+    
+    # Signals
+    fontChanged = pyqtSignal(str, str)  # (font_name, font_type)
+    fontSizeChanged = pyqtSignal(int)   # font_size
+    plotRefreshRequested = pyqtSignal() # manual refresh request
+    
+    def __init__(self, parent=None):
+        """Initialize the font control widget."""
+        super().__init__(parent)
+        self.logger = logging.getLogger(__name__)
+        self.font_manager = get_font_manager()
+        self.available_fonts: Dict[str, str] = {}  # display_name -> actual_font_name
+        
+        # Font size bounds (reasonable range for GUI fonts)
+        self.min_font_size = 8
+        self.max_font_size = 12
+        self.default_font_size = 10
+        
+        self.initUI()
+        self.refresh_font_list()
+        
+    def initUI(self):
+        """Initialize the user interface."""
+        # Main layout
+        layout = QVBoxLayout(self)
+        layout.setContentsMargins(5, 5, 5, 5)  # Minimal margins
+        
+        # Group box for visual clustering
+        group_box = QGroupBox("Font Settings")
+        group_layout = QVBoxLayout(group_box)
+        
+        # Font selector section
+        font_section = self._create_font_selector_section()
+        group_layout.addWidget(font_section)
+        
+        # Font size section
+        size_section = self._create_font_size_section()
+        group_layout.addWidget(size_section)
+        
+        # Control buttons section
+        button_section = self._create_button_section()
+        group_layout.addWidget(button_section)
+        
+        layout.addWidget(group_box)
+        
+    def _create_font_selector_section(self) -> QWidget:
+        """Create the font selector section."""
+        section = QWidget()
+        layout = QVBoxLayout(section)
+        layout.setContentsMargins(0, 0, 0, 0)
+        
+        # Font label and dropdown
+        font_label = QLabel("Font:")
+        layout.addWidget(font_label)
+        
+        self.font_combo = QComboBox()
+        self.font_combo.currentTextChanged.connect(self.on_font_changed)
+        layout.addWidget(self.font_combo)
+        
+        return section
+    
+    def _create_font_size_section(self) -> QWidget:
+        """Create the font size control section."""
+        section = QWidget()
+        layout = QVBoxLayout(section)
+        layout.setContentsMargins(0, 0, 0, 0)
+        
+        # Size label
+        self.size_label = QLabel(f"Qt Font Size: {self.default_font_size}pt")
+        layout.addWidget(self.size_label)
+        
+        # Size slider with value labels
+        slider_layout = QHBoxLayout()
+        
+        # Min label
+        min_label = QLabel(str(self.min_font_size))
+        min_label.setFixedWidth(20)
+        slider_layout.addWidget(min_label)
+        
+        # Slider
+        self.size_slider = QSlider(Qt.Horizontal)
+        self.size_slider.setMinimum(self.min_font_size)
+        self.size_slider.setMaximum(self.max_font_size)
+        self.size_slider.setValue(self.default_font_size)
+        self.size_slider.setTickPosition(QSlider.TicksBelow)
+        self.size_slider.setTickInterval(2)
+        self.size_slider.valueChanged.connect(self.on_font_size_changed)
+        slider_layout.addWidget(self.size_slider)
+        
+        # Max label
+        max_label = QLabel(str(self.max_font_size))
+        max_label.setFixedWidth(20)
+        slider_layout.addWidget(max_label)
+        
+        layout.addLayout(slider_layout)
+        
+        return section
+    
+    def _create_button_section(self) -> QWidget:
+        """Create the control buttons section."""
+        section = QWidget()
+        layout = QHBoxLayout(section)
+        layout.setContentsMargins(0, 0, 0, 0)
+        
+        # Refresh plot button
+        self.refresh_button = QPushButton("Refresh Plot")
+        self.refresh_button.setToolTip("Regenerate current plot with new font settings")
+        self.refresh_button.clicked.connect(self.on_refresh_plot_clicked)
+        layout.addWidget(self.refresh_button)
+        
+        return section
+    
+    def refresh_font_list(self):
+        """Refresh the list of available fonts."""
+        self.logger.debug("Refreshing font list...")
+        self.available_fonts.clear()
+        
+        try:
+            # Get custom fonts from font manager
+            custom_fonts = self.font_manager.loaded_fonts
+            
+            # Get system font candidates
+            system_fonts = self.font_manager.get_available_system_fonts()[:10]
+            
+            # Clear combo box
+            self.font_combo.clear()
+            
+            # Add custom fonts first (highest priority)
+            if custom_fonts:
+                for font_family, font_path in custom_fonts.items():
+                    display_name = f"{font_family} (Custom)"
+                    self.available_fonts[display_name] = font_family
+                    self.font_combo.addItem(display_name)
+                    self.logger.debug(f"Added custom font: {display_name}")
+            
+            # Add system fonts
+            for font_name in system_fonts:
+                display_name = f"{font_name} (System)"
+                self.available_fonts[display_name] = font_name
+                self.font_combo.addItem(display_name)
+                self.logger.debug(f"Added system font: {display_name}")
+            
+            # Add default option with actual system font name
+            system_font_name = self.font_manager.get_default_system_font_name()
+            default_name = f"Default ({system_font_name})"
+            self.available_fonts[default_name] = "default"
+            self.font_combo.addItem(default_name)
+            
+            # Select startup font
+            self._select_startup_font()
+            
+            self.logger.info(f"Font list refreshed: {len(self.available_fonts)} fonts available")
+            
+        except Exception as e:
+            self.logger.error(f"Error refreshing font list: {e}")
+            # Fallback: add default option only
+            self.font_combo.clear()
+            self.font_combo.addItem("Default (System)")
+            self.available_fonts = {"Default (System)": "default"}
+    
+    def _select_startup_font(self):
+        """Select the appropriate font on startup."""
+        # Use font manager's startup font selection logic
+        startup_font_name, startup_font_type = self.font_manager.select_startup_font()
+        
+        # Find the corresponding display name in our combo box
+        target_display_name = None
+        for display_name, actual_name in self.available_fonts.items():
+            if actual_name == startup_font_name:
+                target_display_name = display_name
+                break
+        
+        # If we found the font, select it
+        if target_display_name:
+            index = self.font_combo.findText(target_display_name)
+            if index >= 0:
+                self.font_combo.setCurrentIndex(index)
+                self.logger.info(f"Startup font selected: {target_display_name}")
+                return
+        
+        # Fallback to default if we couldn't find the startup font
+        for i in range(self.font_combo.count()):
+            item_text = self.font_combo.itemText(i)
+            if item_text.startswith("Default ("):
+                self.font_combo.setCurrentIndex(i)
+                self.logger.info(f"Startup font fallback: {item_text}")
+                return
+    
+    def on_font_changed(self, display_name: str):
+        """Handle font selection change."""
+        if not display_name or display_name not in self.available_fonts:
+            return
+            
+        actual_font_name = self.available_fonts[display_name]
+        
+        # Determine font type
+        if "(Custom)" in display_name:
+            font_type = "custom"
+        elif "(System)" in display_name:
+            font_type = "system"
+        else:
+            font_type = "default"
+        
+        self.logger.info(f"Font changed: {display_name} -> {actual_font_name} ({font_type})")
+        
+        # Apply the font change
+        self._apply_font_change(actual_font_name, font_type)
+        
+        # Emit signal for external listeners (including auto-regeneration)
+        self.fontChanged.emit(actual_font_name, font_type)
+    
+    def on_font_size_changed(self, size: int):
+        """Handle font size change."""
+        self.size_label.setText(f"Qt Font Size: {size}pt")
+        self.logger.info(f"Qt font size changed: {size}pt")
+        
+        # Apply Qt font size change
+        self._apply_font_size_change(size)
+        
+        # Emit signal for external listeners
+        self.fontSizeChanged.emit(size)
+    
+    def on_refresh_plot_clicked(self):
+        """Handle manual plot refresh button click."""
+        self.logger.info("Manual plot refresh requested")
+        self.plotRefreshRequested.emit()
+    
+    def _apply_font_change(self, font_name: str, font_type: str):
+        """Apply the font change to both Qt and matplotlib."""
+        try:
+            # Use font manager's centralized font application
+            success = self.font_manager.apply_font_selection(font_name, font_type)
+            if not success:
+                self.logger.warning(f"Font application may have failed: {font_name}")
+                
+        except Exception as e:
+            self.logger.error(f"Error applying font change: {e}")
+    
+    def _apply_font_size_change(self, size: int):
+        """Apply Qt font size change."""
+        try:
+            from PyQt5.QtCore import QCoreApplication
+            from PyQt5.QtGui import QFont
+            
+            app = QCoreApplication.instance()
+            if app:
+                current_font = app.font()
+                current_font.setPointSize(size)
+                app.setFont(current_font)
+                self.logger.debug(f"Qt font size set to: {size}pt")
+                
+        except Exception as e:
+            self.logger.error(f"Error applying font size change: {e}")
+    
+    def get_current_font(self) -> tuple[str, str]:
+        """
+        Get currently selected font.
+        
+        Returns:
+            tuple: (font_name, font_type)
+        """
+        display_name = self.font_combo.currentText()
+        if display_name in self.available_fonts:
+            actual_font_name = self.available_fonts[display_name]
+            
+            if "(Custom)" in display_name:
+                font_type = "custom"
+            elif "(System)" in display_name:
+                font_type = "system"
+            else:
+                font_type = "default"
+                
+            return actual_font_name, font_type
+        
+        return "default", "default"
+    
+    def get_current_font_size(self) -> int:
+        """
+        Get current Qt font size.
+        
+        Returns:
+            int: Current font size in points
+        """
+        return self.size_slider.value()
+    
+    def set_font(self, font_name: str):
+        """
+        Programmatically set the font selection.
+        
+        Args:
+            font_name: Name of font to select
+        """
+        # Find matching display name
+        for display_name, actual_name in self.available_fonts.items():
+            if actual_name == font_name:
+                index = self.font_combo.findText(display_name)
+                if index >= 0:
+                    self.font_combo.setCurrentIndex(index)
+                    return
+        
+        self.logger.warning(f"Font not found in selector: {font_name}")
+    
+    def set_font_size(self, size: int):
+        """
+        Programmatically set the font size.
+        
+        Args:
+            size: Font size in points (will be clamped to valid range)
+        """
+        clamped_size = max(self.min_font_size, min(self.max_font_size, size))
+        self.size_slider.setValue(clamped_size)
+        if clamped_size != size:
+            self.logger.warning(f"Font size clamped: {size} -> {clamped_size}")

font_manager.py

@@ -127,7 +127,15 @@ class FontManager:
             
             if fonts_loaded > 0:
                 # Clear matplotlib's font cache to recognize new fonts
-                fm.fontManager._load_fontmanager(try_read_cache=False)
+                try:
+                    # Try the common method for refreshing font cache
+                    if hasattr(fm.fontManager, '_load_fontmanager'):
+                        fm.fontManager._load_fontmanager(try_read_cache=False)
+                    else:
+                        # For newer matplotlib versions, just reinitialize
+                        fm.fontManager.__init__()
+                except Exception as font_cache_error:
+                    self.logger.debug(f"Font cache refresh failed (non-critical): {font_cache_error}")
                 
         except Exception as e:
             self.logger.error(f"Error loading custom fonts: {e}")
@@ -296,6 +304,138 @@ Recommended fonts: {', '.join(self.system_font_fallbacks.get(platform.system(),
 """
         return instructions
     
+    def get_available_system_fonts(self) -> List[str]:
+        """
+        Get list of available system fonts that are good candidates for selection.
+        
+        Returns:
+            List[str]: List of available system font names
+        """
+        current_system = platform.system()
+        fallback_fonts = self.system_font_fallbacks.get(current_system, 
+                                                       self.system_font_fallbacks['Linux'])
+        
+        # Combine all font categories
+        preferred_fonts = []
+        for category in ['sans-serif', 'serif', 'monospace']:
+            preferred_fonts.extend(fallback_fonts.get(category, []))
+        
+        # Get actually available fonts on the system
+        available_fonts = set(fm.get_font_names())
+        
+        # Filter to only fonts that are actually available
+        system_candidates = []
+        for font_name in preferred_fonts:
+            if font_name in available_fonts:
+                system_candidates.append(font_name)
+        
+        # Remove duplicates while preserving order
+        seen = set()
+        unique_candidates = []
+        for font in system_candidates:
+            if font not in seen:
+                seen.add(font)
+                unique_candidates.append(font)
+        
+        return unique_candidates
+    
+    def get_default_system_font_name(self) -> str:
+        """
+        Get the name of the default system font for display purposes.
+        
+        Returns:
+            str: Human-readable name of the default system font
+        """
+        from PyQt5.QtGui import QFont
+        from PyQt5.QtCore import QCoreApplication
+        
+        # Try to get the actual default font name from Qt
+        app = QCoreApplication.instance()
+        if app:
+            default_font = QFont()
+            return default_font.family()
+        
+        # Fallback to platform-specific defaults
+        current_system = platform.system()
+        if current_system == 'Windows':
+            return 'Segoe UI'
+        elif current_system == 'Darwin':
+            return 'SF Pro Display'
+        else:
+            return 'DejaVu Sans'
+    
+    def select_startup_font(self) -> tuple[str, str]:
+        """
+        Select the appropriate font for application startup.
+        Priority: First custom font alphabetically, then first system font, then default.
+        
+        Returns:
+            tuple: (font_name, font_type) where font_type is 'custom', 'system', or 'default'
+        """
+        # Check for custom fonts first
+        if self.loaded_fonts:
+            custom_font_names = sorted(self.loaded_fonts.keys())
+            selected_font = custom_font_names[0]
+            self.logger.info(f"Startup font selected (custom): {selected_font}")
+            return selected_font, 'custom'
+        
+        # Check for system fonts
+        system_fonts = self.get_available_system_fonts()
+        if system_fonts:
+            selected_font = system_fonts[0]
+            self.logger.info(f"Startup font selected (system): {selected_font}")
+            return selected_font, 'system'
+        
+        # Default fallback
+        default_font = self.get_default_system_font_name()
+        self.logger.info(f"Startup font selected (default): {default_font}")
+        return default_font, 'default'
+    
+    def apply_font_selection(self, font_name: str, font_type: str) -> bool:
+        """
+        Apply a font selection to both matplotlib and Qt.
+        
+        Args:
+            font_name: Name of the font to apply
+            font_type: Type of font ('custom', 'system', or 'default')
+            
+        Returns:
+            bool: True if successful
+        """
+        try:
+            if font_type == 'default':
+                # Reset to default configuration
+                self._configure_matplotlib()
+                self._configure_qt()
+            else:
+                # Apply specific font
+                self._set_specific_font(font_name)
+            
+            self.logger.info(f"Font applied successfully: {font_name} ({font_type})")
+            return True
+            
+        except Exception as e:
+            self.logger.error(f"Error applying font selection: {e}")
+            return False
+    
+    def _set_specific_font(self, font_name: str):
+        """Set a specific font for both matplotlib and Qt."""
+        from PyQt5.QtCore import QCoreApplication
+        from PyQt5.QtGui import QFont
+        
+        # Update Qt font
+        app = QCoreApplication.instance()
+        if app:
+            font = QFont(font_name)
+            app.setFont(font)
+        
+        # Update matplotlib font (insert at front of font list)
+        current_fonts = plt.rcParams['font.sans-serif'].copy()
+        if font_name in current_fonts:
+            current_fonts.remove(font_name)
+        current_fonts.insert(0, font_name)
+        plt.rcParams['font.sans-serif'] = current_fonts
+    
     def get_status_report(self) -> Dict[str, Any]:
         """
         Generate a status report of the font system.
@@ -303,11 +443,17 @@ Recommended fonts: {', '.join(self.system_font_fallbacks.get(platform.system(),
         Returns:
             dict: Status information
         """
+        startup_font, startup_type = self.select_startup_font()
+        
         return {
             'matplotlib_configured': self._matplotlib_configured,
             'qt_configured': self._qt_configured,
             'custom_fonts_loaded': len(self.loaded_fonts),
             'custom_font_families': list(self.loaded_fonts.keys()),
+            'available_system_fonts': self.get_available_system_fonts(),
+            'default_system_font': self.get_default_system_font_name(),
+            'startup_font': startup_font,
+            'startup_font_type': startup_type,
             'fonts_directory_exists': self.fonts_dir.exists(),
             'fonts_directory_path': str(self.fonts_dir.absolute()),
             'current_matplotlib_fonts': plt.rcParams.get('font.sans-serif', [])[:5],

font_selector_widget.py

@@ -0,0 +1,208 @@
+"""
+Font selector widget providing GUI interface to font management system.
+Self-contained widget that can be placed anywhere in the layout.
+"""
+
+import logging
+from typing import List, Dict, Optional
+from PyQt5.QtWidgets import QWidget, QComboBox, QVBoxLayout, QLabel
+from PyQt5.QtCore import pyqtSignal
+
+from font_manager import get_font_manager
+
+
+class FontSelectorWidget(QWidget):
+    """
+    Self-contained font selector widget.
+    
+    Provides a dropdown interface to select fonts from available
+    custom fonts and system fonts. Integrates with the FontManager
+    backend for font discovery and application.
+    """
+    
+    # Signal emitted when font selection changes
+    fontChanged = pyqtSignal(str, str)  # (font_name, font_type)
+    
+    def __init__(self, parent=None):
+        """Initialize the font selector widget."""
+        super().__init__(parent)
+        self.logger = logging.getLogger(__name__)
+        self.font_manager = get_font_manager()
+        self.available_fonts: Dict[str, str] = {}  # display_name -> actual_font_name
+        
+        self.initUI()
+        self.refresh_font_list()
+        
+    def initUI(self):
+        """Initialize the user interface."""
+        layout = QVBoxLayout(self)
+        layout.setContentsMargins(0, 0, 0, 0)  # Minimal margins for embedding
+        
+        # Label
+        self.label = QLabel("Font:")
+        layout.addWidget(self.label)
+        
+        # Font selector dropdown
+        self.font_combo = QComboBox()
+        self.font_combo.currentTextChanged.connect(self.on_font_changed)
+        layout.addWidget(self.font_combo)
+        
+    def refresh_font_list(self):
+        """Refresh the list of available fonts."""
+        self.logger.debug("Refreshing font list...")
+        self.available_fonts.clear()
+        
+        try:
+            # Get custom fonts from font manager
+            custom_fonts = self.font_manager.loaded_fonts
+            
+            # Get system font candidates
+            system_fonts = self._get_system_font_candidates()
+            
+            # Clear combo box
+            self.font_combo.clear()
+            
+            # Add custom fonts first (highest priority)
+            if custom_fonts:
+                for font_family, font_path in custom_fonts.items():
+                    display_name = f"{font_family} (Custom)"
+                    self.available_fonts[display_name] = font_family
+                    self.font_combo.addItem(display_name)
+                    self.logger.debug(f"Added custom font: {display_name}")
+            
+            # Add system fonts
+            for font_name in system_fonts:
+                display_name = f"{font_name} (System)"
+                self.available_fonts[display_name] = font_name
+                self.font_combo.addItem(display_name)
+                self.logger.debug(f"Added system font: {display_name}")
+            
+            # Add default option with actual system font name
+            system_font_name = self.font_manager.get_default_system_font_name()
+            default_name = f"Default ({system_font_name})"
+            self.available_fonts[default_name] = "default"
+            self.font_combo.addItem(default_name)
+            
+            # Select startup font
+            self._select_startup_font()
+            
+            self.logger.info(f"Font list refreshed: {len(self.available_fonts)} fonts available")
+            
+        except Exception as e:
+            self.logger.error(f"Error refreshing font list: {e}")
+            # Fallback: add default option only
+            self.font_combo.clear()
+            self.font_combo.addItem("Default (System)")
+            self.available_fonts = {"Default (System)": "default"}
+    
+    def _get_system_font_candidates(self) -> List[str]:
+        """
+        Get list of available system fonts that are good candidates.
+        
+        Returns:
+            List[str]: List of available system font names
+        """
+        # Use font manager's enhanced system font discovery
+        return self.font_manager.get_available_system_fonts()[:10]  # Limit to reasonable number
+    
+    def _select_startup_font(self):
+        """Select the appropriate font on startup."""
+        # Use font manager's startup font selection logic
+        startup_font_name, startup_font_type = self.font_manager.select_startup_font()
+        
+        # Find the corresponding display name in our combo box
+        target_display_name = None
+        for display_name, actual_name in self.available_fonts.items():
+            if actual_name == startup_font_name:
+                target_display_name = display_name
+                break
+        
+        # If we found the font, select it
+        if target_display_name:
+            index = self.font_combo.findText(target_display_name)
+            if index >= 0:
+                self.font_combo.setCurrentIndex(index)
+                self.logger.info(f"Startup font selected: {target_display_name}")
+                return
+        
+        # Fallback to default if we couldn't find the startup font
+        # Find any item that starts with "Default ("
+        for i in range(self.font_combo.count()):
+            item_text = self.font_combo.itemText(i)
+            if item_text.startswith("Default ("):
+                self.font_combo.setCurrentIndex(i)
+                self.logger.info(f"Startup font fallback: {item_text}")
+                return
+    
+    def on_font_changed(self, display_name: str):
+        """Handle font selection change."""
+        if not display_name or display_name not in self.available_fonts:
+            return
+            
+        actual_font_name = self.available_fonts[display_name]
+        
+        # Determine font type
+        if "(Custom)" in display_name:
+            font_type = "custom"
+        elif "(System)" in display_name:
+            font_type = "system"
+        else:
+            font_type = "default"
+        
+        self.logger.info(f"Font changed: {display_name} -> {actual_font_name} ({font_type})")
+        
+        # Apply the font change
+        self._apply_font_change(actual_font_name, font_type)
+        
+        # Emit signal for any external listeners
+        self.fontChanged.emit(actual_font_name, font_type)
+    
+    def _apply_font_change(self, font_name: str, font_type: str):
+        """Apply the font change to the application."""
+        try:
+            # Use font manager's centralized font application
+            success = self.font_manager.apply_font_selection(font_name, font_type)
+            if not success:
+                self.logger.warning(f"Font application may have failed: {font_name}")
+                
+        except Exception as e:
+            self.logger.error(f"Error applying font change: {e}")
+    
+    def get_current_font(self) -> tuple[str, str]:
+        """
+        Get currently selected font.
+        
+        Returns:
+            tuple: (font_name, font_type)
+        """
+        display_name = self.font_combo.currentText()
+        if display_name in self.available_fonts:
+            actual_font_name = self.available_fonts[display_name]
+            
+            if "(Custom)" in display_name:
+                font_type = "custom"
+            elif "(System)" in display_name:
+                font_type = "system"
+            else:
+                font_type = "default"
+                
+            return actual_font_name, font_type
+        
+        return "default", "default"
+    
+    def set_font(self, font_name: str):
+        """
+        Programmatically set the font selection.
+        
+        Args:
+            font_name: Name of font to select
+        """
+        # Find matching display name
+        for display_name, actual_name in self.available_fonts.items():
+            if actual_name == font_name:
+                index = self.font_combo.findText(display_name)
+                if index >= 0:
+                    self.font_combo.setCurrentIndex(index)
+                    return
+        
+        self.logger.warning(f"Font not found in selector: {font_name}")

main.py

@@ -3,13 +3,14 @@ import os
 import logging
 from PyQt5.QtWidgets import (QApplication, QMainWindow, QWidget, QVBoxLayout, 
                             QHBoxLayout, QSplitter, QLabel, QListWidget, 
-                            QTextEdit, QListWidgetItem)
+                            QTextEdit, QListWidgetItem, QPushButton, QFileDialog)
 from PyQt5.QtCore import Qt
 
 from audio_visualization_widget import AudioVisualizationWidget
 from analysis_results_manager import AnalysisResultsManager
 from logger_setup import setup_logging, parse_log_args
 from font_manager import initialize_fonts, get_font_manager
+from font_control_widget import FontControlWidget
 
 
 class MainWindow(QMainWindow):
@@ -53,6 +54,18 @@ class MainWindow(QMainWindow):
         panel = QWidget()
         layout = QVBoxLayout(panel)
         
+        # Open File button
+        self.open_file_button = QPushButton("Open Audio File...")
+        self.open_file_button.clicked.connect(self.open_file_dialog)
+        layout.addWidget(self.open_file_button)
+        
+        # Font control cluster
+        self.font_control = FontControlWidget()
+        self.font_control.fontChanged.connect(self.on_font_changed)
+        self.font_control.fontSizeChanged.connect(self.on_font_size_changed)
+        self.font_control.plotRefreshRequested.connect(self.on_plot_refresh_requested)
+        layout.addWidget(self.font_control)
+        
         # File list
         self.file_list_label = QLabel("Analyzed Files:")
         layout.addWidget(self.file_list_label)
@@ -116,6 +129,19 @@ class MainWindow(QMainWindow):
             self.visualization_widget.set_status("No audio files detected in drop")
             self.logger.warning("No supported audio files found in drop")
     
+    def open_file_dialog(self):
+        """Open file dialog to select audio files for analysis."""
+        file_path, _ = QFileDialog.getOpenFileName(
+            self,
+            "Select Audio File",
+            "",  # Default directory (empty = current directory)
+            "Audio Files (*.mp3 *.wav *.flac);;All Files (*)"
+        )
+        
+        if file_path:  # User selected a file (didn't cancel)
+            self.logger.info(f"File selected via dialog: {os.path.basename(file_path)}")
+            self.analysis_manager.analyze_file(file_path)
+    
     def on_analysis_started(self, file_path):
         """Called when analysis starts."""
         filename = os.path.basename(file_path)
@@ -172,6 +198,45 @@ class MainWindow(QMainWindow):
         # Update metadata display
         metadata_text = self.analysis_manager.get_metadata_text(file_path)
         self.metadata_display.setText(metadata_text)
+    
+    def on_font_changed(self, font_name: str, font_type: str):
+        """Called when font selection changes."""
+        self.logger.info(f"Font changed via GUI: {font_name} ({font_type})")
+        # Auto-regenerate current plot with new font
+        self._regenerate_current_plot()
+    
+    def on_font_size_changed(self, font_size: int):
+        """Called when Qt font size changes."""
+        self.logger.info(f"Qt font size changed via GUI: {font_size}pt")
+        # Qt font size doesn't affect matplotlib plots, so no regeneration needed
+    
+    def on_plot_refresh_requested(self):
+        """Called when manual plot refresh is requested."""
+        self.logger.info("Manual plot refresh requested via GUI")
+        self._regenerate_current_plot()
+    
+    def _regenerate_current_plot(self):
+        """Regenerate the current plot with updated font settings."""
+        try:
+            # Get the currently selected file
+            current_item = self.file_list.currentItem()
+            if not current_item:
+                self.logger.debug("No file selected for plot regeneration")
+                return
+            
+            file_path = current_item.data(Qt.UserRole)
+            if not file_path:
+                self.logger.debug("No file path found for current selection")
+                return
+            
+            self.logger.info(f"Regenerating plot for: {os.path.basename(file_path)}")
+            
+            # Re-analyze the file to regenerate plots with new font
+            self.analysis_manager.analyze_file(file_path)
+            
+        except Exception as e:
+            self.logger.error(f"Error regenerating plot: {e}")
+            self.visualization_widget.set_status(f"Error regenerating plot: {e}")
 
 
 if __name__ == '__main__':