Merge pull request #10882 from nicola36631/milestone/11.0/feature/textbox-PgUp-PgDn

[TextBox] Add page keyboard navigation

src/Avalonia.Base/Input/Platform/PlatformHotkeyConfiguration.cs

@@ -89,6 +89,22 @@ namespace Avalonia.Input.Platform
             {
                 new KeyGesture(Key.Left, KeyModifiers.Alt)
             };
+            PageLeft = new List<KeyGesture>
+            {
+                new KeyGesture(Key.PageUp, KeyModifiers.Shift)
+            };
+            PageRight = new List<KeyGesture>
+            {
+                new KeyGesture(Key.PageDown, KeyModifiers.Shift)
+            };
+            PageUp = new List<KeyGesture>
+            {
+                new KeyGesture(Key.PageUp)
+            };
+            PageDown = new List<KeyGesture>
+            {
+                new KeyGesture(Key.PageDown)
+            };
         }
 
         public KeyModifiers CommandModifiers { get; set; }
@@ -110,5 +126,9 @@ namespace Avalonia.Input.Platform
         public List<KeyGesture> MoveCursorToTheEndOfDocumentWithSelection { get; set; }
         public List<KeyGesture> OpenContextMenu { get; set; }
         public List<KeyGesture> Back { get; set; }
+        public List<KeyGesture> PageUp { get; set; }
+        public List<KeyGesture> PageDown { get; set; }
+        public List<KeyGesture> PageRight { get; set; }
+        public List<KeyGesture> PageLeft { get; set; }
     }
 }

src/Avalonia.Controls/TextBox.cs

@@ -15,7 +15,6 @@ using Avalonia.Layout;
 using Avalonia.Utilities;
 using Avalonia.Controls.Metadata;
 using Avalonia.Media.TextFormatting;
-using Avalonia.Media.TextFormatting.Unicode;
 using Avalonia.Automation.Peers;
 using Avalonia.Threading;
 
@@ -1214,6 +1213,34 @@ namespace Avalonia.Controls
                 selection = true;
                 handled = true;
             }
+            else if (Match(keymap.PageLeft))
+            {
+                MovePageLeft();
+                movement = true;
+                selection = false;
+                handled = true;
+            }
+            else if (Match(keymap.PageRight))
+            {
+                MovePageRight();
+                movement = true;
+                selection = false;
+                handled = true;
+            }
+            else if (Match(keymap.PageUp))
+            {
+                MovePageUp();
+                movement = true;
+                selection = false;
+                handled = true;
+            }
+            else if (Match(keymap.PageDown))
+            {
+                MovePageDown();
+                movement = true;
+                selection = false;
+                handled = true;
+            }
             else
             {
                 bool hasWholeWordModifiers = modifiers.HasAllFlags(keymap.WholeWordTextActionModifiers);
@@ -1404,8 +1431,6 @@ namespace Avalonia.Controls
             {
                 var point = e.GetPosition(_presenter);
 
-                var oldIndex = CaretIndex;
-
                 _presenter.MoveCaretToPoint(point);
 
                 var caretIndex = _presenter.CaretIndex;
@@ -1738,6 +1763,25 @@ namespace Avalonia.Controls
             }
         }
 
+        private void MovePageRight()
+        {
+            _scrollViewer?.PageRight();
+        }
+
+        private void MovePageLeft()
+        {
+            _scrollViewer?.PageLeft();
+        }
+        private void MovePageUp()
+        {
+            _scrollViewer?.PageUp();
+        }
+
+        private void MovePageDown()
+        {
+            _scrollViewer?.PageDown();
+        }
+
         /// <summary>
         /// Select all text in the TextBox
         /// </summary>