Update touch bar and scrubber code

Headers/AppKit/AppKit.h

@@ -269,6 +269,8 @@
 #import <AppKit/NSTouch.h>
 #import <AppKit/NSTouchBar.h>
 #import <AppKit/NSTouchBarItem.h>
+#import <AppKit/GSTouchBarWindow.h>
+#import <AppKit/NSScrubberTouchBarItem.h>
 #import <AppKit/NSTokenField.h>
 #import <AppKit/NSTokenFieldCell.h>
 #import <AppKit/NSToolbar.h>

Headers/AppKit/GSTouchBarWindow.h

@@ -0,0 +1,139 @@
+/** <title>GSTouchBarWindow</title>
+
+   <abstract>Touch Bar fallback window class for systems without Touch Bar hardware</abstract>
+
+    GSTouchBarWindow provides a way to display NSTouchBar items in a regular
+    window on systems that don't have physical Touch Bar hardware, such as
+    Linux systems. This allows applications using Touch Bar APIs to still
+    function and provide their touch controls through a standard window interface.
+
+    The fallback window system provides:
+    * Automatic detection of Touch Bar hardware availability
+    * Graceful fallback to windowed display mode
+    * Proper layout and presentation of Touch Bar items
+    * Integration with the existing NSTouchBar API
+
+    Copyright (C) 2025 Free Software Foundation, Inc.
+
+    By: GNUstep Contributors
+    Date: Sep 30 2025
+
+    This file is part of the GNUstep Library.
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free
+    Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110 USA.
+*/
+
+#ifndef _GSTouchBarWindow_h_GNUSTEP_GUI_INCLUDE
+#define _GSTouchBarWindow_h_GNUSTEP_GUI_INCLUDE
+#import <AppKit/AppKitDefines.h>
+
+#import <AppKit/NSWindow.h>
+
+#if OS_API_VERSION(MAC_OS_X_VERSION_10_12, GS_API_LATEST)
+
+#if	defined(__cplusplus)
+extern "C" {
+#endif
+
+@class NSTouchBar;
+
+/**
+ * GSTouchBarWindow displays NSTouchBar items in a regular window
+ * for systems without physical Touch Bar hardware.
+ */
+APPKIT_EXPORT_CLASS
+@interface GSTouchBarWindow : NSWindow
+{
+    NSTouchBar *_touchBar;
+    NSView *_itemContainerView;
+    NSMutableArray *_itemViews;
+    BOOL _autoHidesOnDeactivate;
+}
+
+/**
+ * The touch bar whose items are displayed in this window.
+ */
+- (NSTouchBar *) touchBar;
+- (void) setTouchBar: (NSTouchBar *)touchBar;
+
+/**
+ * Whether the window automatically hides when the application becomes inactive.
+ */
+- (BOOL) autoHidesOnDeactivate;
+- (void) setAutoHidesOnDeactivate: (BOOL)autoHides;
+
+/**
+ * Creates a new touch bar window for the specified touch bar.
+ */
+- (id) initWithTouchBar: (NSTouchBar *)touchBar;
+
+/**
+ * Updates the window's content to reflect the current touch bar items.
+ */
+- (void) updateContent;
+
+/**
+ * Positions the window appropriately relative to the main window.
+ */
+- (void) positionRelativeToMainWindow;
+
+@end
+
+/**
+ * GSTouchBarFallbackManager manages the fallback display system
+ * for Touch Bars on systems without hardware support.
+ */
+APPKIT_EXPORT_CLASS
+@interface GSTouchBarFallbackManager : NSObject
+{
+    NSMutableDictionary *_fallbackWindows;
+    BOOL _touchBarHardwareAvailable;
+}
+
+/**
+ * Returns the shared fallback manager instance.
+ */
++ (GSTouchBarFallbackManager *) sharedManager;
+
+/**
+ * Whether Touch Bar hardware is available on this system.
+ */
+- (BOOL) isTouchBarHardwareAvailable;
+
+/**
+ * Shows a fallback window for the specified touch bar.
+ */
+- (void) showFallbackWindowForTouchBar: (NSTouchBar *)touchBar;
+
+/**
+ * Hides the fallback window for the specified touch bar.
+ */
+- (void) hideFallbackWindowForTouchBar: (NSTouchBar *)touchBar;
+
+/**
+ * Returns the fallback window for the specified touch bar, if any.
+ */
+- (GSTouchBarWindow *) fallbackWindowForTouchBar: (NSTouchBar *)touchBar;
+
+@end
+
+#if	defined(__cplusplus)
+}
+#endif
+
+#endif	/* GS_API_MACOSX */
+
+#endif	/* _GSTouchBarWindow_h_GNUSTEP_GUI_INCLUDE */

Headers/AppKit/NSScrubberItemView.h

@@ -43,6 +43,28 @@ APPKIT_EXPORT_CLASS
 
 @end
 
+/**
+ * NSScrubberTextItemView displays a text label in a scrubber item.
+ */
+APPKIT_EXPORT_CLASS
+@interface NSScrubberTextItemView : NSScrubberItemView
+{
+    NSTextField *_textField;
+}
+
+/**
+ * The title displayed by this text item view.
+ */
+- (NSString *) title;
+- (void) setTitle: (NSString *)title;
+
+/**
+ * The text field that displays the title.
+ */
+- (NSTextField *) textField;
+
+@end
+
 #if	defined(__cplusplus)
 }
 #endif

Headers/AppKit/NSScrubberTouchBarItem.h

@@ -0,0 +1,74 @@
+/** <title>NSScrubberTouchBarItem</title>
+
+    <abstract>Touch bar item that displays an NSScrubber control</abstract>
+
+    NSScrubberTouchBarItem is a specialized touch bar item that hosts
+    an NSScrubber control, allowing horizontal scrolling lists to be
+    displayed in the Touch Bar or fallback window.
+
+    Copyright (C) 2025 Free Software Foundation, Inc.
+
+    By: GNUstep Contributors
+    Date: Sep 30 2025
+
+    This file is part of the GNUstep Library.
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free
+    Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110 USA.
+*/
+
+#ifndef _NSScrubberTouchBarItem_h_GNUSTEP_GUI_INCLUDE
+#define _NSScrubberTouchBarItem_h_GNUSTEP_GUI_INCLUDE
+#import <AppKit/AppKitDefines.h>
+
+#import <AppKit/NSTouchBarItem.h>
+
+#if OS_API_VERSION(MAC_OS_X_VERSION_10_12, GS_API_LATEST)
+
+#if	defined(__cplusplus)
+extern "C" {
+#endif
+
+@class NSScrubber;
+
+/**
+ * NSScrubberTouchBarItem is a touch bar item that displays an NSScrubber control.
+ */
+APPKIT_EXPORT_CLASS
+@interface NSScrubberTouchBarItem : NSTouchBarItem
+{
+    NSScrubber *_scrubber;
+}
+
+/**
+ * The scrubber control displayed by this item.
+ */
+- (NSScrubber *) scrubber;
+- (void) setScrubber: (NSScrubber *)scrubber;
+
+/**
+ * Creates a new scrubber touch bar item with the specified identifier.
+ */
+- (id) initWithIdentifier: (NSString *)identifier;
+
+@end
+
+#if	defined(__cplusplus)
+}
+#endif
+
+#endif	/* GS_API_MACOSX */
+
+#endif	/* _NSScrubberTouchBarItem_h_GNUSTEP_GUI_INCLUDE */

Headers/AppKit/NSTouchBar.h

@@ -55,15 +55,110 @@
 #import <AppKit/AppKitDefines.h>
 
 #import <Foundation/NSObject.h>
+#import <Foundation/NSString.h>
+#import <Foundation/NSArray.h>
 
 #if OS_API_VERSION(MAC_OS_X_VERSION_10_12, GS_API_LATEST)
 
 #if	defined(__cplusplus)
 extern "C" {
 #endif
 
+@class NSTouchBarItem;
+@class NSView;
+@class NSWindow;
+
+/**
+ * NSTouchBar manages a collection of touch bar items and their presentation.
+ * On systems without physical touch bar hardware, it can display items in
+ * a fallback window.
+ */
 APPKIT_EXPORT_CLASS
-@interface NSTouchBar : NSObject
+@interface NSTouchBar : NSObject <NSCoding>
+{
+    NSString *_customizationIdentifier;
+    NSArray *_defaultItemIdentifiers;
+    NSArray *_itemIdentifiers;
+    NSString *_principalItemIdentifier;
+    id _delegate;
+    NSMutableDictionary *_items;
+    NSWindow *_fallbackWindow;
+    NSView *_fallbackContentView;
+    BOOL _isVisible;
+    BOOL _showsFallbackWindow;
+}
+
+/**
+ * A string that uniquely identifies the touch bar for customization purposes.
+ */
+- (NSString *) customizationIdentifier;
+- (void) setCustomizationIdentifier: (NSString *)identifier;
+
+/**
+ * An array of item identifiers that defines the default set of items.
+ */
+- (NSArray *) defaultItemIdentifiers;
+- (void) setDefaultItemIdentifiers: (NSArray *)identifiers;
+
+/**
+ * An array of item identifiers for the items currently in the touch bar.
+ */
+- (NSArray *) itemIdentifiers;
+- (void) setItemIdentifiers: (NSArray *)identifiers;
+
+/**
+ * The identifier of the principal item, which receives special treatment.
+ */
+- (NSString *) principalItemIdentifier;
+- (void) setPrincipalItemIdentifier: (NSString *)identifier;
+
+/**
+ * The delegate object that provides touch bar items.
+ */
+- (id) delegate;
+- (void) setDelegate: (id)delegate;
+
+/**
+ * Returns the touch bar item with the specified identifier.
+ */
+- (NSTouchBarItem *) itemForIdentifier: (NSString *)identifier;
+
+/**
+ * Whether the touch bar is currently visible.
+ */
+- (BOOL) isVisible;
+
+/**
+ * Shows or hides the touch bar fallback window on systems without hardware.
+ */
+- (void) setShowsFallbackWindow: (BOOL)shows;
+- (BOOL) showsFallbackWindow;
+
+/**
+ * Shows the fallback window containing touch bar items.
+ */
+- (void) showFallbackWindow;
+
+/**
+ * Hides the fallback window.
+ */
+- (void) hideFallbackWindow;
+
+@end
+
+/**
+ * Informal protocol for NSTouchBar delegate methods.
+ * Delegates may implement these methods to provide items dynamically.
+ */
+@interface NSObject (NSTouchBarDelegate)
+
+/**
+ * Returns the touch bar item for the specified identifier.
+ * This method will be called when the touch bar needs an item
+ * that is not already cached.
+ */
+- (NSTouchBarItem *) touchBar: (NSTouchBar *)touchBar 
+                makeItemForIdentifier: (NSString *)identifier;
 
 @end