右键选中区域不清空选中状态

src/WpfEditor/TextEditorControl.cs

@@ -247,6 +247,79 @@ namespace WpfEditor
                 new PropertyMetadata(true));
 
         #endregion
+    
+    // 创建右键菜单的方法
+    private void CreateContextMenu()
+    {
+        ContextMenu = new ContextMenu();
+        
+        // 复制菜单项
+        MenuItem copyMenuItem = new MenuItem
+        {
+            Header = "复制",
+            Command = ApplicationCommands.Copy
+        };
+        ContextMenu.Items.Add(copyMenuItem);
+        
+        // 剪切菜单项
+        MenuItem cutMenuItem = new MenuItem
+        {
+            Header = "剪切",
+            Command = ApplicationCommands.Cut
+        };
+        ContextMenu.Items.Add(cutMenuItem);
+        
+        // 粘贴菜单项
+        MenuItem pasteMenuItem = new MenuItem
+        {
+            Header = "粘贴",
+            Command = ApplicationCommands.Paste
+        };
+        ContextMenu.Items.Add(pasteMenuItem);
+        
+        // 分隔符
+        ContextMenu.Items.Add(new Separator());
+        
+        // 全选菜单项
+        MenuItem selectAllMenuItem = new MenuItem
+        {
+            Header = "全选",
+            Command = ApplicationCommands.SelectAll
+        };
+        ContextMenu.Items.Add(selectAllMenuItem);
+        
+        // 设置菜单打开前的事件处理，用于控制菜单项的可用性
+        ContextMenu.Opened += OnContextMenuOpened;
+    }
+
+    // 右键菜单打开时的事件处理
+    private void OnContextMenuOpened(object sender, RoutedEventArgs e)
+    {
+        bool hasSelection = HasSelection();
+        bool hasClipboardText = Clipboard.ContainsText();
+        
+        // 根据当前状态设置菜单项的可用性
+        foreach (var item in ContextMenu.Items)
+        {
+            if (item is MenuItem menuItem)
+            {
+                if (menuItem.Command == ApplicationCommands.Copy || 
+                    menuItem.Command == ApplicationCommands.Cut)
+                {
+                    menuItem.IsEnabled = hasSelection;
+                }
+                else if (menuItem.Command == ApplicationCommands.Paste)
+                {
+                    menuItem.IsEnabled = !IsReadOnly && hasClipboardText;
+                }
+                else if (menuItem.Command == ApplicationCommands.SelectAll)
+                {
+                    menuItem.IsEnabled = _lines.Count > 0 && 
+                        _lines.Any(line => line.Characters.Count > 0);
+                }
+            }
+        }
+    }
 
         #region 属性
 
@@ -328,6 +401,10 @@ namespace WpfEditor
             CommandBindings.Add(new CommandBinding(ApplicationCommands.Undo, OnUndo));
             CommandBindings.Add(new CommandBinding(ApplicationCommands.Redo, OnRedo));
             CommandBindings.Add(new CommandBinding(ApplicationCommands.SelectAll, OnSelectAll));
+        
+            // 创建右键菜单
+            CreateContextMenu();
+        
         }
 
         #endregion
@@ -480,9 +557,34 @@ namespace WpfEditor
             }
         }
 
-        protected override void OnMouseDown(MouseButtonEventArgs e)
-        {
-            base.OnMouseDown(e);
+        //protected override void OnMouseDown(MouseButtonEventArgs e)
+        //{
+        //    base.OnMouseDown(e);
+        //    Focus();
+        //    Point position = e.GetPosition(this);
+        //    SetCursorPositionFromPoint(position);
+        //    if (Keyboard.Modifiers != ModifierKeys.Shift)
+        //    {
+        //        //ClearSelection();
+        //    }
+        //    else
+        //    {
+        //        UpdateSelection();
+        //    }
+            
+        //    // 图片中框选光标后面的第一个字符
+        //    if (e.ChangedButton == MouseButton.Left && e.ButtonState == MouseButtonState.Pressed)
+        //    {
+        //        showCurrChar();
+        //    }
+            
+        //    e.Handled = true;
+        //    InvalidateVisual();
+        //}
+
+        protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
+        {
+            base.OnMouseLeftButtonDown(e);
             Focus();
             Point position = e.GetPosition(this);
             SetCursorPositionFromPoint(position);
@@ -493,16 +595,40 @@ namespace WpfEditor
             else
             {
                 UpdateSelection();
-            }
-            
-            // 图片中框选光标后面的第一个字符
+            }
+
+            // 图片中框选光标后面的第一个字符
             if (e.ChangedButton == MouseButton.Left && e.ButtonState == MouseButtonState.Pressed)
             {
                 showCurrChar();
+            }
+
+            e.Handled = true;
+            InvalidateVisual();
+        }
+
+        // 重写右键按下事件
+        protected override void OnMouseRightButtonDown(MouseButtonEventArgs e)
+        {
+            base.OnMouseRightButtonDown(e);
+            
+            // 设置焦点
+            Focus();
+            
+            // 获取鼠标位置并设置光标位置
+            Point position = e.GetPosition(this);
+            
+            // 如果右键点击的位置不在当前选择区域内，则移动光标到点击位置
+            // 但不清除选择区域，这样在选中文本上右键点击时不会丢失选择
+            if (!IsPositionInSelection(position))
+            {
+                //SetCursorPositionFromPoint(position);
+                // 移除以下行，不再清除选择区域
+                // ClearSelection();
+                InvalidateVisual();
             }
             
             e.Handled = true;
-            InvalidateVisual();
         }
 
         protected override void OnMouseMove(MouseEventArgs e)
@@ -1104,6 +1230,51 @@ namespace WpfEditor
                 
             return true;
         }
+        
+        // 检查位置是否在选择区域内的辅助方法
+        private bool IsPositionInSelection(Point position)
+        {
+            if (!HasSelection())
+                return false;
+                
+            // 计算字体度量
+            var typeface = new Typeface(FontFamily, FontStyle, FontWeight, FontStretch);
+            var formattedText = new FormattedText("M", System.Globalization.CultureInfo.CurrentCulture,
+                FlowDirection.LeftToRight, typeface, FontSize, Brushes.Black, VisualTreeHelper.GetDpi(this).PixelsPerDip);
+            double charWidth = formattedText.Width;
+            double lineHeight = formattedText.Height;
+            
+            // 计算点击位置对应的行列
+            int clickLine = Math.Max(0, Math.Min((int)(position.Y / lineHeight) + _scrollOffset, _lines.Count - 1));
+            int clickColumn = Math.Max(0, (int)((position.X - 50) / charWidth)); // 50是行号区域宽度
+            
+            // 获取选择区域的起始和结束位置
+            int startLine = Math.Min(_selectionStartLine, _selectionEndLine);
+            int startColumn = startLine == _selectionStartLine ? _selectionStartColumn : _selectionEndColumn;
+            int endLine = Math.Max(_selectionStartLine, _selectionEndLine);
+            int endColumn = endLine == _selectionEndLine ? _selectionEndColumn : _selectionStartColumn;
+            
+            // 检查点击位置是否在选择区域内
+            if (clickLine < startLine || clickLine > endLine)
+                return false;
+                
+            if (clickLine == startLine && clickLine == endLine)
+            {
+                return clickColumn >= startColumn && clickColumn <= endColumn;
+            }
+            else if (clickLine == startLine)
+            {
+                return clickColumn >= startColumn;
+            }
+            else if (clickLine == endLine)
+            {
+                return clickColumn <= endColumn;
+            }
+            else
+            {
+                return true; // 在中间行
+            }
+        }
         private void SetCursorPositionFromPoint(Point point)
         {
             // 计算字体度量