/// <summary>
        /// Handle html text selection by mouse move over the html with left mouse button pressed.<br/>
        /// Calculate the words in the selected range and set their selected property.
        /// </summary>
        /// <param name="control">the control hosting the html to invalidate</param>
        /// <param name="loc">the mouse location</param>
        /// <param name="allowPartialSelect">true - partial word selection allowed, false - only full words selection</param>
        private void HandleSelection(RControl control, RPoint loc, bool allowPartialSelect)
        {
            // get the line under the mouse or nearest from the top
            var lineBox = DomUtils.GetCssLineBox(_root, loc);
            if (lineBox != null)
            {
                // get the word under the mouse
                var word = DomUtils.GetCssBoxWord(lineBox, loc);

                // if no word found under the mouse use the last or the first word in the line
                if (word == null && lineBox.Words.Count > 0)
                {
                    if (loc.Y > lineBox.LineBottom)
                    {
                        // under the line
                        word = lineBox.Words[lineBox.Words.Count - 1];
                    }
                    else if (loc.X < lineBox.Words[0].Left)
                    {
                        // before the line
                        word = lineBox.Words[0];
                    }
                    else if (loc.X > lineBox.Words[lineBox.Words.Count - 1].Right)
                    {
                        // at the end of the line
                        word = lineBox.Words[lineBox.Words.Count - 1];
                    }
                }

                // if there is matching word
                if (word != null)
                {
                    if (_selectionStart == null)
                    {
                        // on start set the selection start word
                        _selectionStartPoint = loc;
                        _selectionStart = word;
                        if (allowPartialSelect)
                            CalculateWordCharIndexAndOffset(control, word, loc, true);
                    }

                    // always set selection end word
                    _selectionEnd = word;
                    if (allowPartialSelect)
                        CalculateWordCharIndexAndOffset(control, word, loc, false);

                    ClearSelection(_root);
                    if (CheckNonEmptySelection(loc, allowPartialSelect))
                    {
                        CheckSelectionDirection();
                        SelectWordsInRange(_root, _backwardSelection ? _selectionEnd : _selectionStart, _backwardSelection ? _selectionStart : _selectionEnd);
                    }
                    else
                    {
                        _selectionEnd = null;
                    }

                    _cursorChanged = true;
                    control.SetCursorIBeam();
                    control.Invalidate();
                }
            }
        }
 /// <summary>
 /// Handle mouse move to handle hover cursor and text selection.
 /// </summary>
 /// <param name="parent">the control hosting the html to set cursor and invalidate</param>
 /// <param name="loc">the location of the mouse on the html</param>
 public void HandleMouseMove(RControl parent, RPoint loc)
 {
     if (_root.HtmlContainer.IsSelectionEnabled && _mouseDownInControl && parent.LeftMouseButton)
     {
         if (_mouseDownOnSelectedWord)
         {
             // make sure not to start drag-drop on click but when it actually moves as it f***s mouse-up
             if ((DateTime.Now - _lastMouseDown).TotalMilliseconds > 200)
                 StartDragDrop(parent);
         }
         else
         {
             HandleSelection(parent, loc, !_isDoubleClickSelect);
             _inSelection = _selectionStart != null && _selectionEnd != null && (_selectionStart != _selectionEnd || _selectionStartIndex != _selectionEndIndex);
         }
     }
     else
     {
         // Handle mouse hover over the html to change the cursor depending if hovering word, link of other.
         var link = DomUtils.GetLinkBox(_root, loc);
         if (link != null)
         {
             _cursorChanged = true;
             parent.SetCursorHand();
         }
         else if (_root.HtmlContainer.IsSelectionEnabled)
         {
             var word = DomUtils.GetCssBoxWord(_root, loc);
             _cursorChanged = word != null && !word.IsImage && !(word.Selected && (word.SelectedStartIndex < 0 || word.Left + word.SelectedStartOffset <= loc.X) && (word.SelectedEndOffset < 0 || word.Left + word.SelectedEndOffset >= loc.X));
             if (_cursorChanged)
                 parent.SetCursorIBeam();
             else
                 parent.SetCursorDefault();
         }
         else if (_cursorChanged)
         {
             parent.SetCursorDefault();
         }
     }
 }