Fix for issue: #96

lib/src/manager/shortcut/pluto_grid_shortcut.dart

@@ -2,6 +2,19 @@ import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 import 'package:pluto_grid_plus/pluto_grid_plus.dart';
 
+// Create a custom wrapper that filters out NumLock.
+// This will enable the arrow keys and shortcuts to work correctly on Linux too.
+class FilteredHardwareKeyboard extends HardwareKeyboard {
+  final Set<LogicalKeyboardKey> filteredKeys;
+
+  FilteredHardwareKeyboard(this.filteredKeys);
+
+  // Override the HardwareKeyboard logicalKeysPressed to get only the 
+  // filtered keys without NumLock.
+  @override
+  Set<LogicalKeyboardKey> get logicalKeysPressed => filteredKeys;
+}
+
 /// Class for setting shortcut actions.
 ///
 /// Defaults to [PlutoGridShortcut.defaultActions] if not passing [actions].
@@ -29,8 +42,17 @@ class PlutoGridShortcut {
     required PlutoGridStateManager stateManager,
     required HardwareKeyboard state,
   }) {
+    // Remove NumLock before checking shortcuts. This will enable the arrow 
+    // keys and shortcuts to work correctly on Linux too.
+    final Set<LogicalKeyboardKey> filteredKeys = state.logicalKeysPressed
+      .where((key) => key != LogicalKeyboardKey.numLock)
+      .toSet();
+    // Create a wrapper around the HardwareKeyboard instance with filtered keys.
+    final FilteredHardwareKeyboard fakeState = 
+      FilteredHardwareKeyboard(filteredKeys);
+
     for (final action in actions.entries) {
-      if (action.key.accepts(keyEvent.event, state)) {
+      if (action.key.accepts(keyEvent.event, fakeState)) {
         action.value.execute(keyEvent: keyEvent, stateManager: stateManager);
         return true;
       }

lib/src/ui/columns/pluto_column_title.dart

@@ -152,7 +152,15 @@ class PlutoColumnTitleState extends PlutoStateWithChange<PlutoColumnTitle> {
           ),
           iconSize: style.iconSize,
           mouseCursor: contextMenuCursor,
-          onPressed: null,
+          hoverColor: Colors.transparent,
+          splashColor: Colors.transparent,
+          highlightColor: Colors.transparent,
+          onPressed: () {
+            if (mounted && widget.column.enableSorting && 
+                !widget.column.enableContextMenu) {
+                  stateManager.toggleSortColumn(widget.column);
+                }
+          },
         ),
       ),
     );