keyboard mapping with lablgtk2

["Christian Schlager" <Christian.Schlager@t-online.de>]

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hi there,


i want to create a special keyboard mode for creating tables in a textview widget with lablgtk2.
To create one row the user should move with ENTER from cell to cell until the end is reached 
and then ENTER to the next row:

this is my callback-function:

let key_pressed (textview:GText.view) (ev:GdkEvent.Key.t) =
  let newch = GdkEvent.Key.string ev in
  let buffer = textview#buffer in
  let iter = buffer#end_iter in
  if (newch = "\n") then
    buffer#insert ~iter "   "
  else
    buffer#insert ~iter newch;
  true

For now it should insert empty spaces when ENTER is hit. Unfortunately it
doesn't work, it just inserts a new line.
Also, the functionality of the keyboard is limited, the backspace key for 
instance doesn't work, but i could work around that thing.
Who can tell me how to correctly test the keys?
A code snippet might be helpful, too.

Thanks for help,
Christian

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