Add whole word shift selection

samples/Sandbox/Sandbox.csproj

@@ -10,7 +10,6 @@
     <ProjectReference Include="..\..\src\Avalonia.Diagnostics\Avalonia.Diagnostics.csproj" />
     <ProjectReference Include="..\..\src\Avalonia.Controls.ColorPicker\Avalonia.Controls.ColorPicker.csproj" />
     <ProjectReference Include="..\..\src\Avalonia.Controls.DataGrid\Avalonia.Controls.DataGrid.csproj" />
-    <ProjectReference Include="..\..\src\Avalonia.NativeGraphics.Backend\Avalonia.NativeGraphics.Backend.csproj" />
     <ProjectReference Include="..\..\src\Avalonia.Themes.Fluent\Avalonia.Themes.Fluent.csproj" />
   </ItemGroup>
   

src/Avalonia.Controls/RichTextBlock.cs

@@ -338,6 +338,8 @@ namespace Avalonia.Controls
             e.Handled = handled;
         }
 
+        private bool _hasWordSelection;
+
         protected override void OnPointerPressed(PointerPressedEventArgs e)
         {
             base.OnPointerPressed(e);
@@ -363,8 +365,6 @@ namespace Avalonia.Controls
                 var hit = TextLayout.HitTestPoint(point);
                 var index = hit.TextPosition;
 
-                SelectionStart = SelectionEnd = index;
-
 #pragma warning disable CS0618 // Type or member is obsolete
                 switch (e.ClickCount)
 #pragma warning restore CS0618 // Type or member is obsolete
@@ -372,16 +372,27 @@ namespace Avalonia.Controls
                     case 1:
                         if (clickToSelect)
                         {
-                            SelectionStart = Math.Min(oldIndex, index);
-                            SelectionEnd = Math.Max(oldIndex, index);
+                            if (_hasWordSelection)
+                            {
+                                SelectionEnd = StringUtils.NextWord(text, index);
+                            }
+                            else
+                            {
+                                SelectionStart = Math.Min(oldIndex, index);
+                                SelectionEnd = Math.Max(oldIndex, index);
+                            }
                         }
                         else
                         {
+                            _hasWordSelection = false;
+
                             SelectionStart = SelectionEnd = index;
                         }
 
                         break;
                     case 2:
+                        _hasWordSelection = true;
+
                         if (!StringUtils.IsStartOfWord(text, index))
                         {
                             SelectionStart = StringUtils.PreviousWord(text, index);
@@ -390,6 +401,8 @@ namespace Avalonia.Controls
                         SelectionEnd = StringUtils.NextWord(text, index);
                         break;
                     case 3:
+                        _hasWordSelection = false;
+
                         SelectAll();
                         break;
                 }
@@ -411,6 +424,7 @@ namespace Avalonia.Controls
             // selection should not change during pointer move if the user right clicks
             if (e.Pointer.Captured == this && e.GetCurrentPoint(this).Properties.IsLeftButtonPressed)
             {
+                var text = Text;
                 var padding = Padding;
 
                 var point = e.GetPosition(this) - new Point(padding.Left, padding.Top);
@@ -421,7 +435,16 @@ namespace Avalonia.Controls
 
                 var hit = TextLayout.HitTestPoint(point);
 
-                SelectionEnd = hit.TextPosition;
+                if (text != null && _hasWordSelection)
+                {
+                    SelectionEnd = StringUtils.NextWord(text, hit.TextPosition);
+                }
+                else
+                {
+                    SelectionEnd = hit.TextPosition;
+                }
+
+              
             }
         }
 

src/Avalonia.Controls/TextBox.cs

@@ -202,6 +202,7 @@ namespace Avalonia.Controls
         private string _newLine = Environment.NewLine;
         private static readonly string[] invalidCharacters = new String[1] { "\u007f" };
 
+        private bool _hasWordSelection;
         private int _selectedTextChangesMadeSinceLastUndoSnapshot;
         private bool _hasDoneSnapshotOnce;
         private const int _maxCharsBeforeUndoSnapshot = 7;
@@ -1170,16 +1171,27 @@ namespace Avalonia.Controls
                     case 1:
                         if (clickToSelect)
                         {
-                            SelectionStart = Math.Min(oldIndex, index);
-                            SelectionEnd = Math.Max(oldIndex, index);
+                            if (_hasWordSelection)
+                            {
+                                SelectionEnd = StringUtils.NextWord(text, index);
+                            }
+                            else
+                            {
+                                SelectionStart = Math.Min(oldIndex, index);
+                                SelectionEnd = Math.Max(oldIndex, index);
+                            }                           
                         }
                         else
                         {
+                            _hasWordSelection = false;
+
                             SelectionStart = SelectionEnd = index;
                         }
 
                         break;
                     case 2:
+                        _hasWordSelection = true;
+
                         if (!StringUtils.IsStartOfWord(text, index))
                         {
                             SelectionStart = StringUtils.PreviousWord(text, index);
@@ -1188,6 +1200,8 @@ namespace Avalonia.Controls
                         SelectionEnd = StringUtils.NextWord(text, index);
                         break;
                     case 3:
+                        _hasWordSelection = false;
+
                         SelectAll();
                         break;
                 }
@@ -1215,7 +1229,16 @@ namespace Avalonia.Controls
 
                 _presenter.MoveCaretToPoint(point);
 
-                SelectionEnd = _presenter.CaretIndex;
+                var text = Text;
+
+                if (text != null && _hasWordSelection)
+                {
+                    SelectionEnd = StringUtils.NextWord(text, _presenter.CaretIndex);
+                }
+                else
+                {
+                    SelectionEnd = _presenter.CaretIndex;
+                }
             }
         }