Way to insert text where cursor is in field?

[Rob Gould]

I'm sure I must be overlooking something simple - - - - What I'm trying to do is have a text field that detects when the user presses the character "*", and when they do, it replaces that "*" with a bitmap graphic.  (Using the imageSource call). 

I've got the below code which _almost_ does this, except that it replaces all the astericks except the one that the user just pressed.  The trick here is that the user can click and put the cursor anywhere in the text field, so it's not like I can just add an "*" to the last char of the field and swap it out.  I somehow need to find out the position in the text field where the cursor is, and add the asterick, and THEN run the "refreshnotes" handler.

on keydown theKey
  if theKey = "*" then
    refreshnotes
  end if
 
  pass keydown
 
end keydown


on refreshnotes
  put the number of lines in field "notes" into temp
  repeat with x = 1 to temp
    if line x of field "notes" contains "*" then
      put the length of line x of field "notes" into linelength
      repeat with y = 1 to linelength
        if char y of line x of field notes = "*" then
          set the imageSource of char y of line x of field "notes" to "checkbox"
        end if
      end repeat
    end if
  end repeat
end refreshnotes
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