VBA: mouse events IN cell

[NetFlash]

<hr style="color:#FFFFFF; background-color:#FFFFFF" size="1"> Picture the following scenario.
In cell A2 i have the following Text:
The quick brown fox jumps over the lazy dog

When I highlight a portion of this text I need a VBA Function to display the length in cell B2.

For instance.
I select A2: The quick brown fox
Cell B2 displays: 19

What i've got so far is this but have no clue how to use mouse events to capture just the selected portion of the text.
I'm guessing the use of Range("").select

Function GetLength(StrName As String)      
     GetLength = Len(StrName) 
End Function

Any and all help is appreciated

 

[Ruddles]

Thinking out loud...

To highlight (select) part of a string, you'd have to be in edit mode on that cell. You can't run VBA code whilst Excel is in edit mode. As soon as you come out of edit mode, the highlighting disappears (the portion of the string is no longer selected).

Or have I completely missed the mark?

What you could do (Excel 2007+) is change that portion of the string in some way (make it bold or a different font colour) and then use the Worksheet_Change event to work out which bit is bold or red or whatever.