LayoutFarm.Text.EditableTextLine.RemoveRight C# (CSharp) Method

        void RemoveRight(EditableRun t)
        {
            if (t.IsLineBreak)
            {
                throw new NotSupportedException();
            }

            LinkedList<EditableRun> tobeRemoveTextRuns = CollectRightRuns(t);
            LinkedListNode<EditableRun> curNode = tobeRemoveTextRuns.First;
            LocalSuspendLineReArrange();
            while (curNode != null)
            {
                Remove(curNode.Value);
                curNode = curNode.Next;
            }
            LocalResumeLineReArrange();
        }
        LinkedList<EditableRun> CollectLeftRuns(EditableRun t)

        internal void Remove(VisualSelectionRange selectionRange)
        {
            EditableVisualPointInfo startPoint = selectionRange.StartPoint;
            EditableVisualPointInfo endPoint   = selectionRange.EndPoint;

            if (startPoint.TextRun != null)
            {
                if (startPoint.TextRun == endPoint.TextRun)
                {
                    EditableRun removedRun = (EditableRun)startPoint.TextRun;
                    EditableRun.InnerRemove(removedRun,
                                            startPoint.RunLocalSelectedIndex,
                                            endPoint.LineCharIndex - startPoint.LineCharIndex, false);
                    if (removedRun.CharacterCount == 0)
                    {
                        if (startPoint.LineId == this.currentLineNumber)
                        {
                            this.Remove(removedRun);
                        }
                        else
                        {
                            EditableTextLine line = editableFlowLayer.GetTextLine(startPoint.LineId);
                            line.Remove(removedRun);
                        }
                    }
                }
                else
                {
                    EditableVisualPointInfo newStartPoint = null;
                    EditableVisualPointInfo newStopPoint  = null;
                    EditableTextLine        startLine     = null;
                    EditableTextLine        stopLine      = null;
                    if (startPoint.LineId == currentLineNumber)
                    {
                        startLine = this;
                    }
                    else
                    {
                        startLine = editableFlowLayer.GetTextLine(startPoint.LineId);
                    }
                    newStartPoint = startLine.Split(startPoint);
                    if (endPoint.LineId == currentLineNumber)
                    {
                        stopLine = this;
                    }
                    else
                    {
                        stopLine = editableFlowLayer.GetTextLine(endPoint.LineId);
                    }

                    newStopPoint = stopLine.Split(endPoint);
                    if (startLine == stopLine)
                    {
                        if (newStartPoint.TextRun != null)
                        {
                            LinkedList <EditableRun> tobeRemoveRuns = new LinkedList <EditableRun>();
                            if (newStartPoint.LineCharIndex == 0)
                            {
                                foreach (EditableRun t in editableFlowLayer.TextRunForward(
                                             (EditableRun)newStartPoint.TextRun,
                                             (EditableRun)newStopPoint.TextRun))
                                {
                                    tobeRemoveRuns.AddLast(t);
                                }
                            }
                            else
                            {
                                foreach (EditableRun t in editableFlowLayer.TextRunForward(
                                             newStartPoint.TextRun.NextTextRun,
                                             (EditableRun)newStopPoint.TextRun))
                                {
                                    tobeRemoveRuns.AddLast(t);
                                }
                            }
                            startLine.LocalSuspendLineReArrange();
                            foreach (EditableRun t in tobeRemoveRuns)
                            {
                                startLine.Remove(t);
                            }
                            startLine.LocalResumeLineReArrange();
                        }
                        else
                        {
                            throw new NotSupportedException();
                        }
                    }
                    else
                    {
                        int startLineId = newStartPoint.LineId;
                        int stopLineId  = newStopPoint.LineId;
                        if (newStopPoint.LineCharIndex > 0)
                        {
                            stopLine.RemoveLeft((EditableRun)newStopPoint.TextRun);
                        }
                        for (int i = stopLineId - 1; i > startLineId; i--)
                        {
                            EditableTextLine line = editableFlowLayer.GetTextLine(i);
                            line.Clear();
                            line.JoinWithNextLine();
                        }
                        if (newStartPoint.LineCharIndex == 0)
                        {
                            startLine.RemoveRight((EditableRun)newStartPoint.TextRun);
                        }
                        else
                        {
                            EditableRun nextRun = ((EditableRun)newStartPoint.TextRun).NextTextRun;
                            if (nextRun != null && !nextRun.IsLineBreak)
                            {
                                startLine.RemoveRight(nextRun);
                            }
                        }
                        startLine.JoinWithNextLine();
                    }
                }
            }
            else
            {
                VisualPointInfo  newStartPoint = null;
                VisualPointInfo  newStopPoint  = null;
                EditableTextLine startLine     = null;
                EditableTextLine stopLine      = null;
                if (startPoint.LineId == this.currentLineNumber)
                {
                    startLine = this;
                }
                else
                {
                    startLine = editableFlowLayer.GetTextLine(startPoint.LineId);
                }
                newStartPoint = startLine.Split(startPoint);
                if (endPoint.LineId == currentLineNumber)
                {
                    stopLine = this;
                }
                else
                {
                    stopLine = editableFlowLayer.GetTextLine(endPoint.LineId);
                }
                newStopPoint = stopLine.Split(endPoint);
                if (startLine == stopLine)
                {
                    if (newStartPoint.TextRun != null)
                    {
                        LinkedList <EditableRun> tobeRemoveRuns = new LinkedList <EditableRun>();
                        if (newStartPoint.LineCharIndex == -1)
                        {
                            foreach (EditableRun t in editableFlowLayer.TextRunForward(
                                         (EditableRun)newStartPoint.TextRun,
                                         (EditableRun)newStopPoint.TextRun))
                            {
                                tobeRemoveRuns.AddLast(t);
                            }
                        }
                        else
                        {
                            foreach (EditableRun t in editableFlowLayer.TextRunForward(
                                         newStartPoint.TextRun.NextTextRun,
                                         (EditableRun)newStopPoint.TextRun))
                            {
                                tobeRemoveRuns.AddLast(t);
                            }
                        }
                        foreach (EditableRun t in tobeRemoveRuns)
                        {
                            startLine.Remove(t);
                        }
                    }
                    else
                    {
                        throw new NotSupportedException();
                    }
                }
                else
                {
                    int startLineId = newStartPoint.LineId;
                    int stopLineId  = newStopPoint.LineId;
                    if (newStopPoint.LineCharIndex > -1)
                    {
                        stopLine.RemoveLeft((EditableRun)newStopPoint.TextRun);
                    }
                    for (int i = stopLineId - 1; i > startLineId; i--)
                    {
                        EditableTextLine line = editableFlowLayer.GetTextLine(i);
                        line.Clear();
                        line.JoinWithNextLine();
                    }
                    if (newStartPoint.LineCharIndex == -1)
                    {
                        if (newStartPoint.TextRun != null)
                        {
                            startLine.RemoveRight((EditableRun)newStartPoint.TextRun);
                        }
                    }
                    else
                    {
                        EditableRun nextRun = newStartPoint.TextRun.NextTextRun;
                        if (nextRun != null && !nextRun.IsLineBreak)
                        {
                            startLine.RemoveRight(nextRun);
                        }
                    }
                    startLine.JoinWithNextLine();
                }
            }
        }