Alsing.Windows.Forms.SyntaxBox.EditViewControl.OnMouseDown C# (CSharp) Method

        protected override void OnMouseDown(MouseEventArgs e)
        {
            MouseX = e.X;
            MouseY = e.Y;

            SetFocus();
            base.OnMouseDown(e);
            TextPoint pos = Painter.CharFromPixel(e.X, e.Y);
            Row row = null;
            if (pos.Y >= 0 && pos.Y < Document.Count)
                row = Document[pos.Y];

            #region RowEvent

            var rea = new RowMouseEventArgs {Row = row, Button = e.Button, MouseX = MouseX, MouseY = MouseY};
            if (e.X >= View.TextMargin - 7)
            {
                rea.Area = RowArea.TextArea;
            }
            else if (e.X < View.GutterMarginWidth)
            {
                rea.Area = RowArea.GutterArea;
            }
            else if (e.X < View.LineNumberMarginWidth +
                           View.GutterMarginWidth)
            {
                rea.Area = RowArea.LineNumberArea;
            }
            else if (e.X < View.TextMargin - 7)
            {
                rea.Area = RowArea.FoldingArea;
            }

            OnRowMouseDown(rea);

            #endregion

            try
            {
                Row r2 = Document[pos.Y];
                if (r2 != null)
                {
                    if (e.X >= r2.Expansion_PixelEnd && r2.IsCollapsed)
                    {
                        if (r2.expansion_StartSpan != null)
                        {
                            if (r2.expansion_StartSpan.StartRow != null &&
                                r2.expansion_StartSpan.EndRow != null &&
                                r2.expansion_StartSpan.Expanded == false)
                            {
                                if (!IsOverSelection(e.X, e.Y))
                                {
                                    Caret.Position.X = pos.X;
                                    Caret.Position.Y = pos.Y;
                                    Selection.ClearSelection();

                                    Row r3 = r2.Expansion_EndRow;
                                    int x3 = r3.Expansion_StartChar;

                                    Caret.Position.X = x3;
                                    Caret.Position.Y = r3.Index;
                                    Selection.MakeSelection();

                                    Redraw();
                                    View.Action = EditAction.SelectText;

                                    return;
                                }
                            }
                        }
                    }
                }
            }
            catch
            {
                //this is untested code...
            }

            bool shift = NativeMethods.IsKeyPressed(Keys.ShiftKey);

            if (e.X > View.TotalMarginWidth)
            {
                if (e.X > View.TextMargin - 8)
                {
                    if (!IsOverSelection(e.X, e.Y))
                    {
                        //selecting
                        if (e.Button == MouseButtons.Left)
                        {
                            if (!shift)
                            {
                                TextPoint tp = pos;
                                Word w = Document.GetWordFromPos(tp);
                                if (w != null && w.Pattern != null && w.Pattern.Category !=
                                                                      null)
                                {
                                    var pe = new WordMouseEventArgs
                                    {
                                        Pattern = w.Pattern,
                                        Button = e.Button,
                                        Cursor = Cursors.Hand,
                                        Word = w
                                    };

                                    _SyntaxBox.OnWordMouseDown(ref pe);

                                    Cursor = pe.Cursor;
                                    return;
                                }

                                View.Action = EditAction.SelectText;
                                Caret.SetPos(pos);
                                Selection.ClearSelection();
                                Caret.Blink = true;
                                Redraw();
                            }
                            else
                            {
                                View.Action = EditAction.SelectText;
                                Caret.SetPos(pos);
                                Selection.MakeSelection();
                                Caret.Blink = true;
                                Redraw();
                            }
                        }
                    }
                }
                else
                {
                    if (row != null)
                        if (row.expansion_StartSpan != null)
                        {
                            Caret.SetPos(new TextPoint(0, pos.Y));
                            Selection.ClearSelection();
                            Document.ToggleRow(row);
                            Redraw();
                        }
                }
            }
            else
            {
                if (e.X < View.GutterMarginWidth)
                {
                    if (_SyntaxBox.AllowBreakPoints)
                    {
                        Row r = Document[Painter.CharFromPixel(e.X, e.Y).Y];
                        r.Breakpoint = !r.Breakpoint;
                        Redraw();
                    }
                    else
                    {
                        Row r = Document[Painter.CharFromPixel(e.X, e.Y).Y];
                        r.Breakpoint = false;
                        Redraw();
                    }
                }
                else
                {
                    View.Action = EditAction.SelectText;
                    Caret.SetPos(Painter.CharFromPixel(0, e.Y));
                    Selection.ClearSelection();
                    Caret.MoveDown(true);

                    Redraw();
                }
            }
            SetMouseCursor(e.X, e.Y);
        }