Multiline edit editing makes a mess

[DienyduToit]

This textbox (and others with different styles, but always multi-line)
does not permit modification of existing text without making one unholy
mess of it. Deleting a character in the middle of a line does work,
as is proven by Control Get Text to t$, and immediately thereafter
Control Set Text to t$, but this moves the cursor to position 0, and
should in any event not be necessary. Just deleting a character seems
to leave the previous position intact, with the new superimposed.
What can be the problem?

t$=Trim$(InvNte$)
  Control Add TextBox, hDlg&, %CZivfTxt, t$, 16, 207, 192, 40, _
                              %ES_MULTILINE, %WS_EX_CLIENTEDGE
  Control Send hDlg&, %CZivfTxt, %EM_LIMITTEXT, 200, 0
  Control Send hDlg&, %CZivfTxt, %WM_SETFONT, mnFont&, 1
  hCtl&=GetDlgItem (hDlg&, %CZivfTxt)
  TxtWndProc& = SetWindowLong (hCtl&, %GWL_WNDPROC, CodePtr(TxtSubProc))

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[Simon Morgan]

Dieny

You can always change the caret (insertion point) position of an edit control with:

CONTROL SEND hDlg, ID&, %EM_SETSEL, Pos, Pos

where Pos is the desired position of the caret. You can also use this to set a selection within an
edit control (by making the second Pos the end of the desired selection).
You can then send messages to cut or paste the selection, to save resetting the entire string every
time you wish to change it.

In your final line of code, you appear to be sub-classing the edit control, but you don't show the
sub-class procedure. Could there be a problem there?

Regards, Simon


[This message has been edited by Simon Morgan (edited June 22, 2001).]